/* roulang page: index */
/* ========== :root 设计变量 ========== */
:root {
  --bg-primary: #0A1220;
  --bg-secondary: #0D1B2E;
  --bg-tertiary: #12263A;
  --brand-primary: #00E5FF;
  --brand-secondary: #FFC24B;
  --success: #2DD4A7;
  --danger: #FF4D6D;
  --text-primary: #E8F0FF;
  --text-secondary: #94A9C7;
  --text-muted: #5B7194;
  --border-glass: rgba(255,255,255,0.10);
  --border-glass-light: rgba(255,255,255,0.18);
  --glass-bg: rgba(255,255,255,0.045);
  --radius-card: 16px;
  --radius-btn: 999px;
  --radius-tag: 6px;
  --radius-input: 12px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.30);
  --shadow-md: 0 12px 32px rgba(0,0,0,0.35);
  --shadow-lg: 0 24px 60px rgba(0,0,0,0.45);
  --glow-primary: 0 0 30px rgba(0,229,255,0.15);
  --container-max: 1200px;
  --font-cn: "PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
  --font-num: "DIN Alternate","Bebas Neue","Roboto Mono",monospace;
}

/* ========== reset & base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  background-image: repeating-linear-gradient(0deg, transparent 0, transparent 3px, rgba(255,255,255,0.012) 3px, rgba(255,255,255,0.012) 4px);
  overflow-x: hidden;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--brand-primary); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: #66f0ff; }
button, input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
ul { list-style: none; }
::selection { background: rgba(0,229,255,0.25); }

/* ========== layout ========== */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 32px; }
.section { padding: 100px 0; position: relative; }
.section-alt { background-color: var(--bg-secondary); }
.section-line { position: relative; }
.section-line::before {
  content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 80%; height: 1px; background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15) 50%, transparent);
}
.section-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 48px; flex-wrap: wrap; gap: 24px; }
.section-header__left { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.section-tag { display: inline-block; padding: 4px 14px; background: rgba(0,229,255,0.12); border: 1px solid rgba(0,229,255,0.30); border-radius: var(--radius-tag); color: var(--brand-primary); font-size: 13px; letter-spacing: 0.05em; font-weight: 500; }
.section-header h2 { font-size: clamp(24px, 2.6vw, 40px); font-weight: 700; line-height: 1.3; color: var(--text-primary); position: relative; padding-left: 16px; letter-spacing: -0.01em; }
.section-header h2::before { content: ''; position: absolute; left: 0; top: 8%; width: 4px; height: 84%; background: var(--brand-primary); border-radius: 4px; box-shadow: 0 0 12px rgba(0,229,255,0.6); }

/* ========== buttons ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: var(--radius-btn); font-weight: 600; font-size: 15px;
  padding: 0 28px; height: 48px; border: none; cursor: pointer;
  transition: all 0.3s ease; white-space: nowrap; line-height: 1;
}
.btn-primary {
  background: linear-gradient(135deg, rgba(0,229,255,0.90), rgba(0,123,255,0.85));
  color: #fff; box-shadow: 0 8px 28px rgba(0,229,255,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,229,255,0.55); color: #fff; text-shadow: 0 0 8px rgba(255,255,255,0.5); }
.btn-primary:active { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0,229,255,0.40); }
.btn-ghost {
  background: transparent; border: 1.5px solid rgba(0,229,255,0.50); color: var(--brand-primary);
}
.btn-ghost:hover { background: rgba(0,229,255,0.10); border-color: var(--brand-primary); color: var(--brand-primary); }
.btn-text {
  display: inline-flex; align-items: center; gap: 6px; color: var(--brand-primary);
  font-size: 14px; font-weight: 500; position: relative; padding-bottom: 2px;
}
.btn-text::after { content: ''; position: absolute; left: 0; bottom: 0; width: 0; height: 1px; background: var(--brand-primary); transition: width 0.3s ease; }
.btn-text:hover { color: var(--brand-primary); }
.btn-text:hover::after { width: 100%; }
.btn-sm { height: 38px; padding: 0 20px; font-size: 14px; }
.btn-lg { height: 56px; padding: 0 44px; font-size: 17px; }
.btn:focus-visible { outline: 2px solid var(--brand-secondary); outline-offset: 2px; }

/* ========== topbar ========== */
.topbar {
  background: rgba(10,18,32,0.88); border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 6px 0; font-size: 13px; backdrop-filter: blur(10px);
}
.topbar__inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.topbar__domain { font-family: var(--font-num); color: var(--text-muted); display: inline-flex; align-items: center; gap: 8px; letter-spacing: 0.02em; }
.topbar__dot { width: 6px; height: 6px; background: var(--success); border-radius: 50%; box-shadow: 0 0 8px rgba(45,212,167,0.6); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.5; } }
.topbar__notice { color: var(--text-secondary); text-align: center; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 13px; display: flex; align-items: center; justify-content: center; gap: 8px; }
.topbar__login { color: var(--text-secondary); display: inline-flex; align-items: center; gap: 6px; transition: color 0.3s; font-size: 13px; }
.topbar__login:hover { color: var(--brand-primary); }

/* ========== navigation ========== */
.site-nav { position: sticky; top: 0; z-index: 1000; background: rgba(13,27,46,0.78); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid rgba(255,255,255,0.06); }
.site-nav__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 24px; }
.logo { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.logo__icon { width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, rgba(0,229,255,0.25), rgba(0,123,255,0.30)); border: 1px solid rgba(0,229,255,0.40); color: var(--brand-primary); font-size: 18px; }
.logo__text { font-size: 20px; font-weight: 700; color: var(--text-primary); letter-spacing: 0.02em; white-space: nowrap; }
.main-nav { display: flex; align-items: center; }
.main-nav ul { display: flex; align-items: center; gap: 8px; }
.main-nav a { display: inline-block; padding: 8px 16px; color: var(--text-secondary); font-size: 14px; font-weight: 500; border-radius: var(--radius-tag); transition: all 0.3s ease; position: relative; }
.main-nav a:hover { color: var(--brand-primary); background: rgba(0,229,255,0.08); }
.main-nav a.active { color: var(--brand-primary); background: rgba(0,229,255,0.10); }
.main-nav a.active::after { content: ''; position: absolute; left: 20%; right: 20%; bottom: 2px; height: 2px; border-radius: 2px; background: var(--brand-primary); box-shadow: 0 0 8px rgba(0,229,255,0.6); }
.nav-cta { margin-left: 12px; flex-shrink: 0; }
.menu-toggle { display: none; flex-direction: column; justify-content: center; gap: 5px; background: none; border: none; cursor: pointer; width: 42px; height: 42px; padding: 10px; border-radius: 8px; }
.menu-toggle span { display: block; width: 20px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: transform 0.3s ease, opacity 0.3s ease; }
.menu-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2) { opacity: 0; }
.menu-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.menu-toggle:focus-visible { outline: 2px solid var(--brand-secondary); }

/* ========== hero ========== */
.hero {
  position: relative; min-height: 720px; height: 100vh; display: flex; align-items: center;
  background:
    linear-gradient(135deg, rgba(10,18,32,0.94) 0%, rgba(13,27,46,0.82) 55%, rgba(18,38,58,0.65) 100%),
    url('/assets/images/backpic/back-1.png') center right / cover no-repeat,
    var(--bg-primary);
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(rgba(0,229,255,0.10) 1px, transparent 1px);
  background-size: 26px 26px; opacity: 0.5;
}
.hero::after {
  content: ''; position: absolute; top: -20%; right: -10%; width: 500px; height: 500px;
  border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle, rgba(0,229,255,0.20) 0%, transparent 70%);
}
.hero__inner { position: relative; z-index: 2; width: 100%; padding: 120px 0 80px; }
.hero__tagline { display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px; background: rgba(0,229,255,0.10); border: 1px solid rgba(0,229,255,0.30); border-radius: var(--radius-btn); font-size: 14px; font-weight: 500; color: rgba(232,240,255,0.90); margin-bottom: 24px; letter-spacing: 0.03em; }
.hero__tagline i { color: var(--brand-secondary); }
.hero h1 { font-size: clamp(28px, 3.8vw, 52px); font-weight: 800; line-height: 1.25; letter-spacing: -0.02em; margin-bottom: 20px; color: var(--text-primary); max-width: 620px; }
.hero h1 .highlight { color: var(--brand-primary); text-shadow: 0 0 30px rgba(0,229,255,0.5); }
.hero__subtitle { font-size: clamp(15px, 1.1vw, 17px); color: var(--text-secondary); line-height: 1.8; max-width: 560px; margin-bottom: 36px; }
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 36px; }
.hero__trust { display: flex; gap: 24px; flex-wrap: wrap; }
.hero__trust-item { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-secondary); }
.hero__trust-item i { width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: rgba(0,229,255,0.12); border: 1px solid rgba(0,229,255,0.25); color: var(--brand-primary); font-size: 14px; }

/* ========== metrics ========== */
.metrics { background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%); }
.metrics__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.metric-card {
  position: relative; background: var(--glass-bg); border: 1px solid var(--border-glass);
  border-radius: var(--radius-card); padding: 32px 28px; backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px); box-shadow: var(--shadow-md); overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.metric-card::before { content: ''; position: absolute; top: 0; left: 0; width: 3px; height: 48px; background: var(--brand-primary); border-radius: 0 0 4px 4px; box-shadow: 0 0 16px rgba(0,229,255,0.5); }
.metric-card::after {
  content: ''; position: absolute; top: 0; right: 0; width: 120px; height: 120px;
  background: repeating-linear-gradient(60deg, transparent 0 10px, rgba(0,229,255,0.03) 10px 12px);
  pointer-events: none; opacity: 0.6;
}
.metric-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg), var(--glow-primary); border-color: rgba(0,229,255,0.25); }
.metric-card__label { font-size: 13px; color: var(--text-muted); letter-spacing: 0.06em; margin-bottom: 16px; display: flex; align-items: center; gap: 6px; }
.metric-card__value { font-family: var(--font-num); font-size: clamp(32px, 4.5vw, 56px); font-weight: 800; color: var(--brand-primary); line-height: 1.1; margin-bottom: 12px; text-shadow: 0 0 30px rgba(0,229,255,0.30); animation: glow-pulse 3s ease-in-out infinite; position: relative; }
@keyframes glow-pulse { 0%,100% { text-shadow: 0 0 20px rgba(0,229,255,0.25); } 50% { text-shadow: 0 0 38px rgba(0,229,255,0.55); } }
.metric-card__change { display: inline-flex; align-items: center; gap: 4px; font-family: var(--font-num); font-size: 13px; font-weight: 600; color: var(--success); margin-bottom: 8px; }
.metric-card__change.down { color: var(--danger); }
.metric-card__time { font-size: 12px; color: var(--text-muted); font-family: var(--font-num); }

/* ========== services matrix ========== */
.services { background: var(--bg-secondary); }
.services__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.service-card {
  position: relative; background: var(--glass-bg); border: 1px solid var(--border-glass);
  border-radius: var(--radius-card); padding: 40px 36px; backdrop-filter: blur(18px);
  box-shadow: var(--shadow-md); overflow: hidden; transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
  display: flex; flex-direction: column; gap: 16px;
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 1px;
  background: linear-gradient(90deg, rgba(0,229,255,0.40), transparent 70%);
}
.service-card:hover { transform: translateY(-6px) scale(1.01); box-shadow: var(--shadow-lg), var(--glow-primary); border-color: rgba(0,229,255,0.30); }
.service-card__icon {
  width: 64px; height: 64px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  background: rgba(0,229,255,0.10); border: 1px solid rgba(0,229,255,0.30); color: var(--brand-primary);
  font-size: 24px; transition: box-shadow 0.3s ease, transform 0.3s ease; margin-bottom: 4px;
}
.service-card:hover .service-card__icon { box-shadow: 0 0 28px rgba(0,229,255,0.30); transform: scale(1.05); }
.service-card__title { font-size: clamp(17px, 1.4vw, 22px); font-weight: 600; color: var(--text-primary); }
.service-card__desc { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.service-card__tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.service-card__more { margin-top: auto; }
/* 连接线装饰 */
.services__grid { position: relative; }
.services__grid::before {
  content: ''; position: absolute; top: 50%; left: 50%; width: 24px; height: 1px;
  background: rgba(0,229,255,0.20); transform: translate(-50%, -50%);
}

/* ========== comparison ========== */
.comparison { background: var(--bg-primary); }
.comparison__layout { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: stretch; position: relative; }
.comparison__arrow { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 5; width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, rgba(0,229,255,0.90), rgba(0,123,255,0.85)); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 16px; box-shadow: 0 0 24px rgba(0,229,255,0.40); }
.comparison__card { background: var(--glass-bg); border-radius: var(--radius-card); padding: 36px; border: 1px solid var(--border-glass); backdrop-filter: blur(18px); }
.comparison__card--old { background: rgba(0,0,0,0.20); border-color: rgba(255,255,255,0.08); }
.comparison__card--new { background: rgba(0,229,255,0.06); border-color: rgba(0,229,255,0.25); box-shadow: 0 0 40px rgba(0,229,255,0.10); }
.comparison__card-title { font-size: 18px; font-weight: 600; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.comparison__card--old .comparison__card-title { color: var(--text-muted); }
.comparison__card--new .comparison__card-title { color: var(--brand-primary); }
.comparison__list { display: flex; flex-direction: column; gap: 12px; }
.comparison__list li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.comparison__list li i { margin-top: 4px; font-size: 14px; }
.comparison__list--new li { color: var(--text-primary); }
.comparison__list--new li i { color: var(--brand-primary); }
.comparison__list--old li i { color: var(--text-muted); }
.comparison__bars { margin-top: 48px; display: flex; flex-direction: column; gap: 20px; }
.comparison__bar-row { display: grid; grid-template-columns: 160px 1fr auto; gap: 16px; align-items: center; }
.comparison__bar-label { font-size: 14px; font-weight: 500; color: var(--text-secondary); }
.comparison__bar-track { display: flex; flex-direction: column; gap: 6px; }
.comparison__bar-line { height: 8px; border-radius: 4px; position: relative; overflow: hidden; background: rgba(255,255,255,0.06); }
.comparison__bar-fill { position: absolute; top: 0; left: 0; height: 100%; border-radius: 4px; transition: width 0.6s ease; }
.comparison__bar-fill.old { background: rgba(255,255,255,0.15); }
.comparison__bar-fill.new { background: linear-gradient(90deg, rgba(0,229,255,0.50), var(--brand-primary)); box-shadow: 0 0 8px rgba(0,229,255,0.40); }
.comparison__bar-value { font-family: var(--font-num); font-size: 13px; color: var(--text-secondary); text-align: right; white-space: nowrap; }
.comparison__bar-value.new { color: var(--brand-primary); }

/* ========== news ========== */
.news { background: var(--bg-secondary); }
.news-card {
  background: var(--glass-bg); border: 1px solid var(--border-glass); border-radius: var(--radius-card);
  overflow: hidden; backdrop-filter: blur(18px); transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
  height: 100%; display: flex; flex-direction: column;
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg), var(--glow-primary); background: rgba(255,255,255,0.065); }
.news-card__link { display: flex; flex-direction: column; height: 100%; color: var(--text-primary); }
.news-card__cover { position: relative; width: 100%; aspect-ratio: 16 / 9; overflow: hidden; }
.news-card__cover img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.news-card:hover .news-card__cover img { transform: scale(1.04); }
.news-card__category { position: absolute; top: 12px; left: 12px; padding: 4px 12px; background: rgba(0,229,255,0.85); color: #062; border-radius: var(--radius-tag); font-size: 12px; font-weight: 600; backdrop-filter: blur(4px); }
.news-card__body { padding: 24px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.news-card__body h3 { font-size: 18px; font-weight: 600; color: var(--text-primary); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card__body h3:hover { color: var(--brand-primary); }
.news-card__body p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card__meta { display: flex; align-items: center; gap: 16px; font-size: 12px; color: var(--text-muted); margin-top: auto; border-top: 1px solid rgba(255,255,255,0.06); padding-top: 16px; }
.empty-state {
  grid-column: 1 / -1; border: 2px dashed rgba(255,255,255,0.15); border-radius: var(--radius-card);
  padding: 80px 40px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; color: var(--text-muted); text-align: center;
}
.empty-state i { font-size: 40px; color: rgba(0,229,255,0.40); }
.empty-state p { font-size: 15px; }

/* ========== FAQ ========== */
.faq { background: var(--bg-primary); }
.faq__wrap { max-width: 860px; margin: 0 auto; }
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--glass-bg); border: 1px solid var(--border-glass); border-radius: var(--radius-card); backdrop-filter: blur(18px); overflow: hidden; transition: border-color 0.3s ease, box-shadow 0.3s ease; }
.faq-item.is-active { border-color: rgba(0,229,255,0.35); box-shadow: 0 0 30px rgba(0,229,255,0.10); }
.faq-item__question { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 20px 28px; background: none; border: none; color: var(--text-primary); font-size: 16px; font-weight: 500; cursor: pointer; text-align: left; transition: color 0.3s ease; gap: 16px; }
.faq-item__question:hover { color: var(--brand-primary); }
.faq-item__icon { width: 24px; height: 24px; border-radius: 6px; background: rgba(0,229,255,0.12); border: 1px solid rgba(0,229,255,0.30); display: flex; align-items: center; justify-content: center; color: var(--brand-primary); transition: transform 0.35s ease; flex-shrink: 0; font-size: 16px; font-weight: 400; }
.faq-item.is-active .faq-item__icon { transform: rotate(45deg); background: rgba(0,229,255,0.25); }
.faq-item__answer { padding: 0 28px 20px; font-size: 14px; color: var(--text-secondary); line-height: 1.7; display: none; }
.faq-item.is-active .faq-item__answer { display: block; }
.faq__foot { text-align: center; margin-top: 36px; }
.faq__foot p { color: var(--text-muted); font-size: 14px; margin-bottom: 12px; }

/* ========== contact form ========== */
.contact { background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%); position: relative; overflow: hidden; }
.contact::before { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 900px; height: 400px; background: radial-gradient(ellipse, rgba(0,229,255,0.08) 0%, transparent 70%); pointer-events: none; }
.contact__panel { max-width: 720px; margin: 0 auto; background: rgba(255,255,255,0.045); border: 1px solid rgba(255,255,255,0.10); border-radius: var(--radius-card); padding: 48px; backdrop-filter: blur(18px); box-shadow: var(--shadow-lg); position: relative; }
.contact__badge { position: absolute; top: -18px; left: 32px; padding: 6px 16px; background: linear-gradient(135deg, rgba(0,229,255,0.90), rgba(0,123,255,0.85)); color: #fff; border-radius: var(--radius-btn); font-family: var(--font-num); font-size: 13px; font-weight: 600; letter-spacing: 0.03em; box-shadow: 0 4px 20px rgba(0,229,255,0.35); }
.contact__panel h2 { font-size: clamp(24px, 2.4vw, 36px); font-weight: 700; margin-bottom: 12px; text-align: center; }
.contact__panel .contact__sub { text-align: center; color: var(--text-secondary); margin-bottom: 32px; font-size: 14px; }
.form-field { margin-bottom: 20px; }
.form-field label { display: block; font-size: 14px; color: var(--text-secondary); margin-bottom: 8px; font-weight: 500; }
.form-field label .optional { color: var(--text-muted); font-weight: 400; font-size: 12px; }
.form-control { width: 100%; padding: 14px 16px; background: rgba(0,0,0,0.25); border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius-input); color: var(--text-primary); font-size: 14px; transition: border-color 0.3s ease, box-shadow 0.3s ease; outline: none; }
.form-control::placeholder { color: var(--text-muted); }
.form-control:focus { border-color: rgba(0,229,255,0.60); box-shadow: 0 0 0 3px rgba(0,229,255,0.15); }
select.form-control { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2394A9C7' d='M6 8L0 0h12z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 16px center; padding-right: 44px; }
textarea.form-control { resize: vertical; min-height: 90px; }
.form-field .btn { width: 100%; margin-top: 8px; }
.form-note { text-align: center; font-size: 13px; color: var(--text-muted); margin-top: 18px; display: flex; align-items: center; justify-content: center; gap: 6px; }
.form-note i { color: var(--success); }

/* ========== footer ========== */
.site-footer { background: rgba(10,18,32,0.94); border-top: 1px solid rgba(0,229,255,0.12); padding: 64px 0 24px; position: relative; }
.site-footer::before { content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 60%; height: 1px; background: linear-gradient(90deg, transparent, var(--brand-primary) 50%, transparent); opacity: 0.4; }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer__brand .logo { margin-bottom: 16px; }
.footer__brand .footer__desc { font-size: 14px; color: var(--text-muted); line-height: 1.7; max-width: 340px; }
.footer__col-title { font-size: 15px; font-weight: 600; color: var(--text-primary); margin-bottom: 20px; letter-spacing: 0.04em; }
.footer__col ul { display: flex; flex-direction: column; gap: 10px; }
.footer__col a { color: var(--text-secondary); font-size: 14px; transition: color 0.3s ease, padding-left 0.3s ease; }
.footer__col a:hover { color: var(--brand-primary); padding-left: 4px; }
.footer__contact ul { gap: 14px; }
.footer__contact li { display: flex; gap: 10px; font-size: 14px; color: var(--text-secondary); }
.footer__contact li i { color: var(--brand-primary); width: 18px; }
.footer__bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer__copy { font-size: 13px; color: var(--text-muted); display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.footer__copy strong { color: var(--text-secondary); font-weight: 500; }
.footer__icp { font-size: 13px; color: var(--text-muted); }

/* ========== back to top ========== */
.back-to-top {
  position: fixed; right: 20px; bottom: 20px; width: 42px; height: 42px; border-radius: var(--radius-btn);
  background: rgba(13,27,46,0.80); border: 1px solid rgba(0,229,255,0.40); color: var(--brand-primary);
  display: flex; align-items: center; justify-content: center; z-index: 999; cursor: pointer;
  backdrop-filter: blur(10px); font-size: 16px; transition: all 0.3s ease;
}
.back-to-top:hover { background: rgba(0,229,255,0.15); transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,229,255,0.30); }
.back-to-top:focus-visible { outline: 2px solid var(--brand-secondary); }

/* ========== responsive ========== */
@media screen and (max-width: 1024px) {
  .section { padding: 80px 0; }
  .metrics__grid { grid-template-columns: repeat(2, 1fr); }
  .services__grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .comparison__layout { grid-template-columns: 1fr; gap: 24px; }
  .comparison__arrow { top: auto; left: 50%; bottom: auto; transform: translate(-50%, 0) rotate(90deg); position: relative; margin: 0 auto; display: flex; }
  .comparison__bar-row { grid-template-columns: 120px 1fr auto; }
  .footer__grid { grid-template-columns: 1fr; gap: 40px; }
  .hero { min-height: 640px; height: auto; }
  .hero__inner { padding: 100px 0 60px; }
}
@media screen and (max-width: 640px) {
  .container { padding: 0 20px; }
  .section { padding: 60px 0; }
  .site-nav__inner { height: 62px; }
  .logo__text { font-size: 17px; }
  .nav-cta, .topbar__notice { display: none; }
  .menu-toggle { display: flex; }
  .main-nav {
    position: fixed; top: 62px; left: 0; right: 0; background: rgba(10,18,32,0.97);
    backdrop-filter: blur(20px); padding: 20px 24px 32px; transform: translateY(-140%); opacity: 0;
    transition: transform 0.4s ease, opacity 0.3s ease; z-index: 998; border-bottom: 1px solid rgba(0,229,255,0.10);
    display: block; height: auto;
  }
  .main-nav.is-open { transform: translateY(0); opacity: 1; }
  .main-nav ul { flex-direction: column; gap: 6px; }
  .main-nav a { display: block; padding: 14px 18px; font-size: 18px; line-height: 1.4; border-radius: 10px; }
  .hero { min-height: 60vh; background-position: 60% center; }
  .hero h1 { font-size: clamp(26px, 6.5vw, 36px); }
  .hero__actions { flex-direction: column; width: 100%; }
  .hero__actions .btn { width: 100%; height: 48px; }
  .metrics__grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .metric-card { padding: 20px 16px; }
  .metric-card__value { font-size: clamp(26px, 8vw, 38px); }
  .services__grid { grid-template-columns: 1fr; }
  .service-card { padding: 28px 24px; }
  .comparison__card { padding: 24px 20px; }
  .comparison__bar-row { grid-template-columns: 90px 1fr auto; gap: 8px; }
  .comparison__bar-label { font-size: 12px; }
  .comparison__bar-value { font-size: 11px; }
  .contact__panel { padding: 32px 20px; }
  .contact__badge { left: 20px; }
  .section-header { flex-direction: column; align-items: flex-start; gap: 12px; }
  .news-card__body { padding: 20px; }
  .footer__grid { gap: 32px; }
  .footer__bottom { flex-direction: column; text-align: center; justify-content: center; }
  .form-field .btn { height: 48px; }
}

/* roulang page: category1 */
:root {
  --bg-deep: #0A1220;
  --bg-second: #0D1B2E;
  --bg-card: rgba(255, 255, 255, 0.045);
  --accent: #00E5FF;
  --amber: #FFC24B;
  --success: #2DD4A7;
  --danger: #FF4D6D;
  --text-main: #E8F0FF;
  --text-sub: #94A9C7;
  --text-dim: #5B7194;
  --radius-card: 16px;
  --radius-btn: 999px;
  --radius-tag: 6px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.45);
  --border-glass: 1px solid rgba(255, 255, 255, 0.10);
  --font-main: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-num: "DIN Alternate", "Bebas Neue", "Roboto Mono", monospace;
  --container: 1200px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: color 0.2s; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font-family: inherit; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 32px; }
.section { padding: 100px 0; position: relative; }
.section--alt { background: var(--bg-second); }
.text-accent { color: var(--accent); }
.text-amber { color: var(--amber); }
.text-dim { color: var(--text-dim); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 32px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all 0.25s ease;
  outline: none;
  white-space: nowrap;
}
.btn--primary {
  background: linear-gradient(135deg, rgba(0,229,255,0.9), rgba(0,123,255,0.85));
  color: #fff;
  box-shadow: 0 8px 28px rgba(0, 229, 255, 0.35);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0, 229, 255, 0.55); color: #fff; }
.btn--primary:active { transform: translateY(0); box-shadow: 0 4px 16px rgba(0, 229, 255, 0.3); }
.btn--primary:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }
.btn--ghost {
  background: transparent;
  border: 1.5px solid rgba(0, 229, 255, 0.5);
  color: var(--accent);
}
.btn--ghost:hover { background: rgba(0, 229, 255, 0.1); border-color: var(--accent); }
.btn--ghost:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: var(--radius-tag);
  background: rgba(0, 229, 255, 0.12);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--accent);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
}
.badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}
.badge--amber::before { background: var(--amber); }
.badge--red::before { background: var(--danger); }

/* ========== TOPBAR ========== */
.topbar {
  background: rgba(10, 18, 32, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  height: 32px;
  display: flex;
  align-items: center;
}
.topbar__inner { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.topbar__domain {
  font-family: var(--font-num);
  color: var(--text-sub);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.topbar__domain i { color: var(--success); font-size: 8px; }
.topbar__promo { color: var(--text-dim); letter-spacing: 0.03em; }
.topbar__actions a { color: var(--text-sub); display: inline-flex; align-items: center; gap: 6px; }
.topbar__actions a:hover { color: var(--accent); }

/* ========== NAV ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 27, 46, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav-wrap { height: 76px; display: flex; align-items: center; }
.nav-wrap__inner { display: flex; align-items: center; justify-content: space-between; width: 100%; gap: 32px; }
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo__icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(0,229,255,0.25), rgba(0,123,255,0.2));
  border: 1px solid rgba(0, 229, 255, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 18px;
  box-shadow: 0 0 12px rgba(0,229,255,0.25);
}
.logo__text { font-size: 19px; font-weight: 700; letter-spacing: 0.02em; color: var(--text-main); }
.main-nav ul { display: flex; align-items: center; gap: 6px; }
.main-nav ul li a {
  display: inline-block;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  border-radius: 8px;
  transition: all 0.2s;
  position: relative;
}
.main-nav ul li a:hover { color: var(--accent); background: rgba(0,229,255,0.06); }
.main-nav ul li a.active { color: var(--accent); }
.main-nav ul li a.active::after {
  content: '';
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 2px;
  height: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  border-radius: 2px;
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 10px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text-main); border-radius: 2px; transition: all 0.3s; }

/* ========== CATEGORY HERO ========== */
.category-hero {
  position: relative;
  min-height: 380px;
  display: flex;
  align-items: center;
  text-align: center;
  background: linear-gradient(135deg, rgba(10,18,32,0.95), rgba(13,27,46,0.9)), url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  padding: 80px 0 96px;
}
.category-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at 85% 20%, rgba(0,229,255,0.13), transparent 60%);
  pointer-events: none;
}
.category-hero__inner { position: relative; z-index: 2; max-width: 800px; margin: 0 auto; }
.category-hero h1 {
  font-size: clamp(28px, 3.8vw, 48px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  line-height: 1.3;
}
.category-hero h1 .highlight {
  color: var(--accent);
  text-shadow: 0 0 20px rgba(0,229,255,0.5);
}
.category-hero__sub {
  color: var(--text-sub);
  font-size: clamp(15px, 1.3vw, 17px);
  max-width: 640px;
  margin: 0 auto 32px;
  line-height: 1.8;
}
.category-hero__actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* ========== TAB BAR ========== */
.tab-bar {
  position: relative;
  z-index: 5;
  margin-top: -48px;
  margin-bottom: 0;
}
.tab-bar__inner {
  background: rgba(18, 38, 58, 0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: var(--border-glass);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-md);
  max-width: 720px;
  margin: 0 auto;
  padding: 8px;
  display: flex;
  gap: 4px;
}
.tab-bar__inner a {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  border-radius: 12px;
  transition: all 0.2s;
}
.tab-bar__inner a:hover { color: var(--accent); background: rgba(0,229,255,0.06); }
.tab-bar__inner a.active { color: var(--accent); background: rgba(0,229,255,0.1); box-shadow: inset 0 0 0 1px rgba(0,229,255,0.25); }

/* ========== SECTION HEAD ========== */
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}
.section-head .section-head__tag {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 14px;
  font-family: var(--font-num);
}
.section-head h2 {
  font-size: clamp(24px, 2.6vw, 38px);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}
.section-head h2::before {
  content: '';
  position: absolute;
  left: -18px;
  top: 8px;
  bottom: 8px;
  width: 4px;
  background: var(--accent);
  border-radius: 4px;
  box-shadow: 0 0 12px rgba(0,229,255,0.5);
}
.section-head p { color: var(--text-sub); font-size: 15px; line-height: 1.8; }

/* ========== LARGE CARDS ========== */
.large-cards { padding: 90px 0 60px; }
.large-card {
  border-radius: var(--radius-card);
  background: var(--bg-card);
  border: var(--border-glass);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  height: 100%;
  position: relative;
}
.large-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(0,229,255,0.35); }
.large-card__media { position: relative; overflow: hidden; height: 240px; }
.large-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.large-card:hover .large-card__media img { transform: scale(1.04); }
.large-card__media::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(10,18,32,0.1) 0%, rgba(10,18,32,0.55) 100%); }
.large-card__media .badge { position: absolute; top: 16px; left: 16px; z-index: 2; backdrop-filter: blur(6px); background: rgba(10,18,32,0.6); }
.large-card__body { padding: 28px 28px 32px; }
.large-card__body h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; letter-spacing: -0.01em; }
.large-card__body p { color: var(--text-sub); font-size: 14px; line-height: 1.75; margin-bottom: 0; }
.large-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  margin-top: 18px;
  transition: gap 0.2s;
}
.large-card__link:hover { gap: 12px; }

/* ========== SMALL CARDS ========== */
.small-cards { padding: 60px 0 90px; }
.small-card {
  border-radius: var(--radius-card);
  background: var(--bg-card);
  border: var(--border-glass);
  padding: 0;
  overflow: hidden;
  transition: all 0.3s ease;
  height: 100%;
}
.small-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(0,229,255,0.3); }
.small-card__media { height: 150px; overflow: hidden; position: relative; }
.small-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.small-card:hover .small-card__media img { transform: scale(1.05); }
.small-card__media::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(10,18,32,0.05), rgba(10,18,32,0.35)); }
.small-card__body { padding: 20px 22px 24px; }
.small-card__body h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.small-card__body p { font-size: 13px; color: var(--text-sub); line-height: 1.7; margin-bottom: 0; }
.small-card__icon { position: absolute; left: 16px; bottom: -18px; z-index: 3; width: 40px; height: 40px; border-radius: 10px; background: rgba(13,27,46,0.9); border: 1px solid rgba(0,229,255,0.3); display: flex; align-items: center; justify-content: center; color: var(--accent); font-size: 16px; box-shadow: 0 4px 12px rgba(0,0,0,0.3); }

/* ========== DATA TABLE ========== */
.data-table-wrap { padding: 90px 0; }
.data-table {
  border-radius: var(--radius-card);
  background: var(--bg-card);
  border: var(--border-glass);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.data-table table { margin: 0; background: transparent; }
.data-table thead { background: rgba(0,229,255,0.08); }
.data-table th {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  letter-spacing: 0.03em;
}
.data-table td {
  font-size: 14px;
  color: var(--text-sub);
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-family: var(--font-num);
  letter-spacing: 0.02em;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: rgba(0,229,255,0.04); }
.data-table td.value { color: var(--accent); font-weight: 700; font-size: 16px; }

/* ========== FAQ ========== */
.faq-section { padding: 90px 0; }
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  border-radius: var(--radius-card);
  background: var(--bg-card);
  border: var(--border-glass);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.3s;
}
.faq-item.open { border-color: rgba(0,229,255,0.3); }
.faq-item__q {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-main);
  user-select: none;
}
.faq-item__q .icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 8px;
  background: rgba(0,229,255,0.1);
  border: 1px solid rgba(0,229,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  transition: transform 0.3s;
}
.faq-item.open .faq-item__q .icon { transform: rotate(45deg); background: rgba(0,229,255,0.2); }
.faq-item__a { padding: 0 24px 20px 66px; font-size: 14px; color: var(--text-sub); line-height: 1.8; }

/* ========== CTA BAND ========== */
.cta-band {
  padding: 70px 0;
  position: relative;
  background: linear-gradient(135deg, rgba(0,229,255,0.1), rgba(0,123,255,0.06));
  border-top: 1px solid rgba(0,229,255,0.15);
  border-bottom: 1px solid rgba(0,229,255,0.15);
  text-align: center;
}
.cta-band::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(60deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 2px, transparent 2px, transparent 12px);
  pointer-events: none;
}
.cta-band h2 { font-size: clamp(24px, 2.8vw, 38px); font-weight: 800; margin-bottom: 14px; }
.cta-band p { color: var(--text-sub); margin-bottom: 28px; font-size: 15px; }
.cta-band .btn { z-index: 2; position: relative; }

/* ========== FOOTER ========== */
.site-footer {
  background: rgba(10, 18, 32, 0.9);
  border-top: 1px solid rgba(0, 229, 255, 0.1);
  padding: 70px 0 0;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer__brand .logo { margin-bottom: 18px; }
.footer__desc { color: var(--text-sub); font-size: 14px; line-height: 1.8; max-width: 360px; }
.footer__col-title { font-size: 15px; font-weight: 600; margin-bottom: 20px; color: var(--text-main); }
.footer__col ul li { margin-bottom: 10px; }
.footer__col ul li a { color: var(--text-sub); font-size: 14px; }
.footer__col ul li a:hover { color: var(--accent); }
.footer__contact ul li { color: var(--text-sub); font-size: 14px; display: flex; align-items: center; gap: 8px; }
.footer__contact ul li i { color: var(--accent); width: 16px; }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.footer__copy { font-size: 13px; color: var(--text-dim); }
.footer__icp { font-size: 13px; color: var(--text-dim); }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .section { padding: 80px 0; }
  .large-cards { padding: 70px 0 40px; }
  .small-cards { padding: 40px 0 70px; }
  .data-table-wrap { padding: 70px 0; }
  .faq-section { padding: 70px 0; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .topbar__promo { display: none; }
  .nav-wrap { height: 64px; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 96px;
    left: 0;
    right: 0;
    background: rgba(13,27,46,0.97);
    backdrop-filter: blur(20px);
    padding: 20px;
    transform: translateY(-140%);
    transition: transform 0.3s ease;
    z-index: 99;
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 4px; }
  .main-nav ul li a { display: block; padding: 14px 16px; font-size: 16px; border-radius: 10px; }
  .main-nav ul li a.active::after { display: none; }
  .main-nav ul li a.active { background: rgba(0,229,255,0.1); }
  .category-hero { min-height: 320px; padding: 60px 0 88px; }
  .category-hero h1 { font-size: 28px; }
  .category-hero__actions { flex-direction: column; align-items: center; }
  .category-hero__actions .btn { width: 100%; max-width: 320px; }
  .tab-bar__inner { flex-direction: column; padding: 8px; }
  .tab-bar__inner a { justify-content: flex-start; padding: 12px 16px; }
  .large-card__media { height: 200px; }
  .small-card__media { height: 140px; }
  .footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .footer__bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .section { padding: 60px 0; }
  .category-hero__actions .btn { height: 46px; font-size: 14px; }
  .data-table { overflow-x: auto; }
  .data-table table { min-width: 480px; }
}

/* roulang page: article */
:root{
  --bg-primary:#0A1220;
  --bg-secondary:#0D1B2E;
  --bg-tertiary:#12263A;
  --brand:#00E5FF;
  --brand-dark:#009FBF;
  --accent:#FFC24B;
  --success:#2DD4A7;
  --danger:#FF4D6D;
  --text-primary:#E8F0FF;
  --text-secondary:#94A9C7;
  --text-muted:#5B7194;
  --border-glass:rgba(255,255,255,0.10);
  --card-bg:rgba(255,255,255,0.045);
  --radius-card:16px;
  --radius-btn:999px;
  --radius-tag:6px;
  --radius-input:12px;
  --shadow-sm:0 2px 8px rgba(0,0,0,0.3);
  --shadow-md:0 12px 32px rgba(0,0,0,0.35);
  --shadow-lg:0 24px 60px rgba(0,0,0,0.45);
  --font-cn:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
  --font-num:"DIN Alternate","Bebas Neue","Roboto Mono",monospace;
  --container-max:1200px;
  --transition:all .3s cubic-bezier(.4,0,.2,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-cn);
  background:var(--bg-primary);
  color:var(--text-primary);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:var(--transition)}
ul,ol{list-style:none}
button,input,select,textarea{font-family:var(--font-cn);font-size:16px}
.container{max-width:var(--container-max);margin:0 auto;padding:0 32px}
@media(max-width:640px){.container{padding:0 20px}}
::selection{background:rgba(0,229,255,.2);color:var(--text-primary)}

/* Header */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(10,18,32,.9);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.top-bar{
  height:32px;
  background:rgba(10,18,32,.8);
  border-bottom:1px solid rgba(255,255,255,.08);
  font-size:12px;
  color:var(--text-muted);
}
.top-bar__inner{display:flex;align-items:center;justify-content:space-between;height:32px}
.top-bar__domain{font-family:var(--font-num);color:var(--text-secondary);display:flex;align-items:center;gap:6px;letter-spacing:.04em}
.status-dot{width:6px;height:6px;border-radius:50%;background:var(--success);box-shadow:0 0 6px var(--success);display:inline-block}
.top-bar__msg{color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:50%}
.top-bar__login{color:var(--text-secondary);display:flex;align-items:center;gap:5px;transition:var(--transition)}
.top-bar__login:hover{color:var(--brand)}
.nav-wrap{
  height:68px;
  display:flex;align-items:center;
  border-bottom:1px solid rgba(255,255,255,.04);
  background:rgba(13,27,46,.55);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
}
.nav-container{display:flex;align-items:center;justify-content:space-between;width:100%;height:100%}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo__icon{
  width:40px;height:40px;border-radius:10px;
  background:linear-gradient(135deg,rgba(0,229,255,.2),rgba(0,123,255,.15));
  border:1px solid rgba(0,229,255,.3);
  display:flex;align-items:center;justify-content:center;
  color:var(--brand);font-size:18px;
  box-shadow:0 0 18px rgba(0,229,255,.1);
}
.logo__text{font-size:20px;font-weight:800;letter-spacing:-.01em;color:var(--text-primary)}
.logo__text span{color:var(--brand)}
.main-nav ul{display:flex;align-items:center;gap:4px}
.main-nav a{
  display:block;padding:8px 16px;border-radius:8px;
  font-size:14px;font-weight:500;color:var(--text-secondary);
  position:relative;transition:var(--transition);
}
.main-nav a:hover{color:var(--brand);background:rgba(0,229,255,.06)}
.main-nav a.active{color:var(--brand);font-weight:600}
.main-nav a.active::after{
  content:'';position:absolute;left:16px;right:16px;bottom:3px;height:2px;
  background:linear-gradient(90deg,var(--brand),rgba(0,229,255,.1));
  box-shadow:0 0 8px rgba(0,229,255,.4);
}
.nav-toggle{
  display:none;width:44px;height:44px;border:none;background:transparent;
  cursor:pointer;padding:10px;border-radius:8px;
}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--text-secondary);margin:5px auto;transition:var(--transition)}
.nav-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
@media(max-width:840px){
  .nav-toggle{display:block}
  .main-nav{
    position:fixed;top:100px;left:0;right:0;
    background:rgba(10,18,32,.97);
    backdrop-filter:blur(20px);
    -webkit-backdrop-filter:blur(20px);
    padding:20px;
    flex-direction:column;
    transform:translateY(-120%);
    opacity:0;
    pointer-events:none;
    transition:var(--transition);
    border-bottom:1px solid rgba(0,229,255,.1);
  }
  .main-nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .main-nav ul{flex-direction:column;align-items:stretch;gap:2px}
  .main-nav a{padding:14px 16px;font-size:17px;border-radius:10px}
}
@media(max-width:640px){
  .top-bar__msg{display:none}
  .nav-wrap{height:64px}
  .logo__text{font-size:17px}
  .logo__icon{width:34px;height:34px;font-size:15px}
}

/* Article Hero */
.article-hero{
  margin-top:100px;
  padding:60px 0 44px;
  background:linear-gradient(180deg,rgba(10,18,32,.6),rgba(13,27,46,.9)),url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  position:relative;
  border-bottom:1px solid rgba(255,255,255,.05);
}
.article-hero::before{
  content:'';position:absolute;top:0;left:0;right:0;bottom:0;
  background:radial-gradient(circle at 85% 20%,rgba(0,229,255,.08),transparent 60%);
  pointer-events:none;
}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--text-muted);margin-bottom:20px}
.breadcrumb a{color:var(--text-muted);transition:var(--transition)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb__sep{color:var(--text-muted);opacity:.5}
.breadcrumb__current{color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:260px}
.article-hero__title{
  font-size:clamp(24px,3.2vw,36px);
  font-weight:800;
  line-height:1.35;
  color:var(--text-primary);
  margin-bottom:14px;
  letter-spacing:-.01em;
  max-width:860px;
}
.article-hero__meta{display:flex;align-items:center;flex-wrap:wrap;gap:18px;font-size:13px;color:var(--text-muted)}
.article-hero__meta-item{display:flex;align-items:center;gap:6px}
.article-hero__meta-item i{color:var(--brand);font-size:13px}
.article-hero__cat{display:inline-flex;align-items:center;gap:6px;background:rgba(0,229,255,.1);border:1px solid rgba(0,229,255,.25);color:var(--brand);font-size:12px;padding:3px 12px;border-radius:var(--radius-tag);margin-right:6px}
@media(max-width:640px){
  .article-hero{margin-top:96px;padding:40px 0 30px}
  .breadcrumb{font-size:12px}
  .article-hero__meta{flex-wrap:wrap;gap:10px}
}

/* Article Main */
.article-main{padding:56px 0 60px;background:var(--bg-primary)}
.article__content{
  max-width:860px;margin:0 auto;
  background:rgba(255,255,255,.02);
  border:1px solid rgba(255,255,255,.06);
  border-radius:var(--radius-card);
  padding:48px 56px;
  box-shadow:var(--shadow-md);
}
.article__content p{
  font-size:16px;line-height:1.85;color:#C7D6F2;
  margin-bottom:24px;letter-spacing:.01em;
  max-width:760px;
}
.article__content h2{
  font-size:clamp(20px,2.2vw,28px);
  font-weight:700;color:var(--text-primary);
  margin:44px 0 20px;
  padding-left:14px;
  border-left:4px solid var(--brand);
  line-height:1.4;
}
.article__content h3{
  font-size:clamp(17px,1.6vw,22px);
  font-weight:600;color:var(--text-primary);
  margin:36px 0 16px;
}
.article__content h4{
  font-size:17px;font-weight:600;color:var(--text-primary);
  margin:28px 0 14px;
}
.article__content strong{color:var(--text-primary);font-weight:600}
.article__content a{color:var(--brand);border-bottom:1px solid rgba(0,229,255,.3)}
.article__content a:hover{color:var(--accent);border-color:var(--accent)}
.article__content blockquote{
  border-left:3px solid var(--brand);
  background:rgba(0,229,255,.05);
  padding:20px 24px;
  border-radius:0 var(--radius-card) var(--radius-card) 0;
  margin:28px 0;
  color:var(--text-secondary);
  font-style:normal;
}
.article__content blockquote p{margin-bottom:0;color:var(--text-secondary)}
.article__content ul,.article__content ol{margin:20px 0 24px;padding-left:24px;color:#C7D6F2}
.article__content ul li{list-style:disc;margin-bottom:8px}
.article__content ol li{list-style:decimal;margin-bottom:8px}
.article__content img{border-radius:12px;border:1px solid rgba(255,255,255,.08);margin:28px 0;box-shadow:var(--shadow-sm)}
.article__content figure{margin:28px 0}
.article__content figcaption{font-size:13px;color:var(--text-muted);text-align:center;margin-top:8px}
.article__content table{width:100%;border-collapse:collapse;margin:28px 0;font-size:14px;overflow:hidden;border-radius:12px}
.article__content table th{background:rgba(0,229,255,.08);color:var(--text-primary);font-weight:600;padding:12px 16px;text-align:left}
.article__content table td{padding:12px 16px;border-bottom:1px solid rgba(255,255,255,.05);color:var(--text-secondary)}
.article__content table tr:hover td{background:rgba(255,255,255,.02)}
.article__content .wp-block-table{overflow-x:auto}
.article__not-found{
  text-align:center;padding:80px 30px;
  display:flex;flex-direction:column;align-items:center;gap:16px;
}
.article__not-found i{font-size:48px;color:var(--text-muted);opacity:.5}
.article__not-found h2{font-size:24px;font-weight:700;color:var(--text-primary);border:none;padding:0;margin:0}
.article__not-found p{color:var(--text-muted);font-size:15px;max-width:420px;margin:0 auto}
@media(max-width:640px){
  .article__content{padding:28px 20px;border-radius:12px}
  .article__content p{font-size:15px;line-height:1.8}
}

/* Tags */
.article__tags{
  max-width:860px;margin:36px auto 0;
  display:flex;align-items:flex-start;flex-wrap:wrap;gap:10px;
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(0,229,255,.08);
  border:1px solid rgba(0,229,255,.2);
  color:var(--brand);
  font-size:12px;padding:4px 14px;
  border-radius:var(--radius-tag);
  transition:var(--transition);
}
.tag:hover{background:rgba(0,229,255,.15);border-color:rgba(0,229,255,.4)}
.tag::before{content:'';width:5px;height:5px;border-radius:50%;background:var(--success)}

/* Post Nav */
.post-nav{
  max-width:860px;margin:36px auto 0;
  display:grid;grid-template-columns:1fr 1fr;gap:16px;
}
.post-nav__item{
  display:flex;flex-direction:column;gap:6px;
  background:rgba(255,255,255,.03);
  border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius-card);
  padding:18px 22px;
  transition:var(--transition);
}
.post-nav__item:hover{background:rgba(0,229,255,.05);border-color:rgba(0,229,255,.25);transform:translateY(-2px)}
.post-nav__item--next{text-align:right}
.post-nav__label{font-size:12px;color:var(--text-muted);display:flex;align-items:center;gap:6px}
.post-nav__item--next .post-nav__label{justify-content:flex-end}
.post-nav__title{font-size:15px;font-weight:600;color:var(--text-secondary)}
.post-nav__item:hover .post-nav__title{color:var(--brand)}
@media(max-width:640px){
  .post-nav{grid-template-columns:1fr}
  .post-nav__item--next{text-align:left}
  .post-nav__item--next .post-nav__label{justify-content:flex-start}
}

/* Related */
.article__related{
  max-width:1200px;margin:60px auto 0;
  padding-top:48px;
  border-top:1px solid rgba(255,255,255,.05);
}
.section-title{
  font-size:clamp(22px,2.4vw,28px);
  font-weight:700;color:var(--text-primary);
  margin-bottom:30px;
  position:relative;padding-left:16px;
}
.section-title::before{content:'';position:absolute;left:0;top:4px;bottom:4px;width:4px;background:var(--brand);border-radius:2px;box-shadow:0 0 10px rgba(0,229,255,.4)}
.related-posts__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.related-card{
  background:var(--card-bg);
  border:1px solid var(--border-glass);
  border-radius:var(--radius-card);
  overflow:hidden;
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  transition:var(--transition);
  box-shadow:var(--shadow-md);
  height:100%;
  display:flex;flex-direction:column;
}
.related-card:hover{
  transform:translateY(-5px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(0,229,255,.2);
}
.related-card__img{position:relative;overflow:hidden;height:180px}
.related-card__img img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.related-card:hover .related-card__img img{transform:scale(1.04)}
.related-card__img::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 60%,rgba(10,18,32,.6))}
.related-card__body{padding:20px 22px 24px;flex:1;display:flex;flex-direction:column}
.related-card__badge{display:inline-flex;align-items:center;gap:6px;align-self:flex-start;font-size:12px;color:var(--brand);background:rgba(0,229,255,.1);border:1px solid rgba(0,229,255,.2);padding:2px 10px;border-radius:var(--radius-tag);margin-bottom:10px}
.related-card__badge::before{content:'';width:5px;height:5px;border-radius:50%;background:var(--success)}
.related-card__title{font-size:17px;font-weight:600;color:var(--text-primary);line-height:1.5;margin-bottom:8px;transition:var(--transition)}
.related-card:hover .related-card__title{color:var(--brand)}
.related-card__desc{font-size:14px;color:var(--text-muted);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:12px}
.related-card__meta{font-size:12px;color:var(--text-muted);display:flex;align-items:center;gap:14px;margin-top:auto}
.related-card__meta span{display:flex;align-items:center;gap:4px}
.related-card__meta i{font-size:12px;color:var(--text-muted)}
.related-empty{
  border:2px dashed rgba(255,255,255,.1);
  border-radius:var(--radius-card);
  padding:48px;text-align:center;color:var(--text-muted);
  display:flex;flex-direction:column;align-items:center;gap:10px;
}
.related-empty i{font-size:32px;opacity:.4}
@media(max-width:1024px){
  .related-posts__grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .related-posts__grid{grid-template-columns:1fr}
  .related-card__img{height:160px}
  .article__related{margin-top:44px;padding-top:36px}
}

/* Back */
.article__back{
  text-align:center;margin:56px 0 0;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:15px;font-weight:600;padding:0 30px;height:46px;
  border-radius:var(--radius-btn);cursor:pointer;transition:var(--transition);
  text-decoration:none;border:none;font-family:var(--font-cn);
}
.btn--primary{
  background:linear-gradient(135deg,rgba(0,229,255,.9),rgba(0,123,255,.85));
  color:#fff;box-shadow:0 8px 28px rgba(0,229,255,.25);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 12px 40px rgba(0,229,255,.4);color:#fff}
.btn--primary:active{transform:translateY(0);box-shadow:0 4px 16px rgba(0,229,255,.2)}
.btn--ghost{
  background:transparent;color:var(--brand);
  border:1.5px solid rgba(0,229,255,.5);
}
.btn--ghost:hover{background:rgba(0,229,255,.08);border-color:var(--brand)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media(max-width:640px){
  .btn{width:100%;height:48px}
  .article__back{margin-top:40px}
}

/* Footer */
.site-footer{
  background:rgba(10,18,32,.98);
  border-top:1px solid rgba(0,229,255,.12);
  padding:60px 0 30px;
  position:relative;
}
.site-footer::before{
  content:'';position:absolute;top:-1px;left:10%;right:10%;height:1px;
  background:linear-gradient(90deg,transparent,rgba(0,229,255,.3),transparent);
}
.footer__grid{
  display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:48px;
  padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.06);
}
.footer__brand .logo{margin-bottom:18px}
.footer__desc{font-size:14px;color:var(--text-muted);line-height:1.75;max-width:360px}
.footer__col-title{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:20px;position:relative;padding-bottom:10px}
.footer__col-title::after{content:'';position:absolute;left:0;bottom:0;width:28px;height:2px;background:var(--brand);border-radius:2px}
.footer__col ul{display:flex;flex-direction:column;gap:10px}
.footer__col a{color:var(--text-muted);font-size:14px;transition:var(--transition)}
.footer__col a:hover{color:var(--brand);padding-left:6px}
.footer__contact li{display:flex;align-items:center;gap:10px;color:var(--text-muted);font-size:14px;margin-bottom:12px}
.footer__contact li i{color:var(--brand);width:16px;text-align:center}
.footer__bottom{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:28px;font-size:13px;color:var(--text-muted);
}
.footer__copy strong{color:var(--text-secondary)}
.footer__copy a{color:var(--text-muted)}
.footer__copy a:hover{color:var(--brand)}
.footer__icp{color:var(--text-muted)}
@media(max-width:1024px){
  .footer__grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media(max-width:640px){
  .footer__grid{grid-template-columns:1fr;gap:32px;padding-bottom:30px}
  .site-footer{padding:44px 0 24px}
  .footer__bottom{flex-direction:column;gap:12px;text-align:center}
  .footer__desc{max-width:100%}
}

/* Back to Top */
.to-top{
  position:fixed;right:20px;bottom:20px;z-index:999;
  width:46px;height:46px;border-radius:50%;
  background:rgba(13,27,46,.85);
  border:1px solid rgba(0,229,255,.3);
  color:var(--brand);font-size:18px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-md);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:var(--transition);
  opacity:0;transform:translateY(20px);pointer-events:none;
}
.to-top.visible{opacity:1;transform:translateY(0);pointer-events:auto}
.to-top:hover{color:#fff;background:rgba(0,229,255,.2);box-shadow:0 0 20px rgba(0,229,255,.2)}
.to-top:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* Responsive helpers */
@media(max-width:640px){
  body{font-size:15px}
  .article__content table{display:block;overflow-x:auto}
}

/* roulang page: category3 */
:root {
  --bg-deep: #0A1220;
  --bg-dark: #0D1B2E;
  --bg-card: #12263A;
  --brand-cyan: #00E5FF;
  --brand-cyan-rgb: 0, 229, 255;
  --accent-gold: #FFC24B;
  --success: #2DD4A7;
  --danger: #FF4D6D;
  --text-main: #E8F0FF;
  --text-sub: #94A9C7;
  --text-dim: #5B7194;
  --radius-card: 16px;
  --radius-btn: 999px;
  --radius-tag: 6px;
  --radius-input: 12px;
  --container-max: 1200px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 12px 32px rgba(0,0,0,0.35);
  --shadow-lg: 0 24px 60px rgba(0,0,0,0.45);
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
}
a { color: var(--brand-cyan); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: #77F0FF; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 32px; }

/* ===== Top Info Bar ===== */
.top-bar {
  background: rgba(10,18,32,0.8);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 6px 0;
  font-size: 13px;
  color: var(--text-sub);
}
.top-bar .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.top-bar__domain { font-family: "Roboto Mono", monospace; color: var(--text-main); display: flex; align-items: center; gap: 8px; }
.top-bar__domain::before { content: ''; width: 6px; height: 6px; background: var(--success); border-radius: 50%; box-shadow: 0 0 8px var(--success); }
.top-bar__msg { flex: 1; text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-bar__login { color: var(--text-sub); display: flex; align-items: center; gap: 6px; transition: color var(--transition-fast); }
.top-bar__login:hover { color: var(--brand-cyan); }

/* ===== Main Navigation ===== */
.main-nav-wrap {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13,27,46,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.main-nav .container { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 24px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text-main); }
.logo__icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, rgba(0,229,255,0.25), rgba(0,123,255,0.2));
  border: 1px solid rgba(0,229,255,0.35);
  display: flex; align-items: center; justify-content: center;
  color: var(--brand-cyan); font-size: 16px;
  box-shadow: 0 0 16px rgba(0,229,255,0.2);
}
.logo__text { font-size: 18px; font-weight: 800; letter-spacing: -0.02em; }
.main-nav ul { display: flex; align-items: center; gap: 6px; margin: 0; }
.main-nav ul li a {
  display: block; padding: 10px 18px; font-size: 14px; font-weight: 500;
  color: var(--text-sub); border-radius: 8px; transition: all var(--transition-fast);
  position: relative;
}
.main-nav ul li a:hover { color: var(--brand-cyan); background: rgba(0,229,255,0.06); }
.main-nav ul li a.active { color: var(--brand-cyan); }
.main-nav ul li a.active::after {
  content: ''; position: absolute; left: 18px; right: 18px; bottom: 4px;
  height: 2px; background: var(--brand-cyan); border-radius: 2px;
  box-shadow: 0 0 10px rgba(0,229,255,0.6);
}
.nav-toggle { display: none; background: none; border: 1px solid rgba(0,229,255,0.3); color: var(--brand-cyan); border-radius: 8px; width: 42px; height: 42px; font-size: 18px; cursor: pointer; align-items: center; justify-content: center; transition: all var(--transition-fast); }
.nav-toggle:hover { background: rgba(0,229,255,0.1); }
.mobile-menu {
  display: none; position: fixed; top: 68px; left: 0; right: 0; bottom: 0; z-index: 99;
  background: rgba(10,18,32,0.97);
  backdrop-filter: blur(20px);
  padding: 40px 24px;
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block; font-size: 18px; line-height: 48px; color: var(--text-main);
  border-bottom: 1px solid rgba(255,255,255,0.06); padding: 0 12px;
}
.mobile-menu a:hover, .mobile-menu a.active { color: var(--brand-cyan); }

/* ===== Hero ===== */
.page-hero {
  position: relative;
  padding: 80px 0 40px;
  background: linear-gradient(180deg, #0A1220 0%, #0D1B2E 100%);
  overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 80% 20%, rgba(0,229,255,0.12) 0%, transparent 50%),
    radial-gradient(circle at 10% 90%, rgba(0,123,255,0.08) 0%, transparent 40%);
  pointer-events: none;
}
.page-hero__inner { position: relative; z-index: 2; text-align: center; }
.page-hero h1 {
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 18px;
}
.page-hero h1 .highlight { color: var(--brand-cyan); text-shadow: 0 0 24px rgba(0,229,255,0.5); }
.page-hero__desc {
  font-size: clamp(15px, 1.2vw, 17px);
  color: var(--text-sub);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-tabs {
  display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap;
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 10px;
  max-width: 680px;
  margin: 0 auto;
  backdrop-filter: blur(12px);
}
.hero-tabs a {
  display: inline-block; padding: 10px 24px; font-size: 14px; font-weight: 500;
  color: var(--text-sub); border-radius: 8px; transition: all var(--transition-base);
}
.hero-tabs a:hover { color: var(--brand-cyan); background: rgba(0,229,255,0.08); }
.hero-tabs a.active { color: var(--brand-cyan); background: rgba(0,229,255,0.12); box-shadow: 0 0 18px rgba(0,229,255,0.15); }

/* ===== Section Common ===== */
.section { padding: 90px 0; position: relative; }
.section--dark { background-color: var(--bg-dark); }
.section--deep { background-color: var(--bg-deep); }
.section__header { text-align: center; margin-bottom: 56px; }
.section__tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: 0.05em; color: var(--brand-cyan);
  background: rgba(0,229,255,0.08); border: 1px solid rgba(0,229,255,0.2);
  border-radius: var(--radius-tag); padding: 4px 14px; margin-bottom: 14px;
}
.section__tag::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--brand-cyan); box-shadow: 0 0 8px var(--brand-cyan); }
.section__title {
  font-size: clamp(24px, 2.6vw, 36px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  line-height: 1.3;
  position: relative;
  margin-bottom: 16px;
}
.section__title::before {
  content: ''; display: inline-block; width: 4px; height: 24px; border-radius: 4px;
  background: var(--brand-cyan); box-shadow: 0 0 12px rgba(0,229,255,0.5);
  margin-right: 14px; vertical-align: middle;
}
.section__desc { font-size: 15px; color: var(--text-sub); max-width: 700px; margin: 0 auto; }

/* ===== Content Matrix ===== */
.matrix-section .section__title { text-align: left; }
.matrix-section .section__desc { text-align: left; margin: 0 0 40px; }
.matrix-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 48px; }
.matrix-card {
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: all var(--transition-base);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-md);
}
.matrix-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0,229,255,0.2);
  border-color: rgba(0,229,255,0.3);
}
.matrix-card__img { position: relative; overflow: hidden; height: 220px; }
.matrix-card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.matrix-card:hover .matrix-card__img img { transform: scale(1.03); }
.matrix-card__img::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,229,255,0.08) 0%, transparent 50%);
  pointer-events: none;
}
.matrix-card__badge {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  background: rgba(10,18,32,0.8); backdrop-filter: blur(8px);
  border: 1px solid rgba(0,229,255,0.4);
  border-radius: var(--radius-tag);
  padding: 4px 12px;
  font-size: 12px; color: var(--brand-cyan); font-weight: 500;
}
.matrix-card__body { padding: 28px; }
.matrix-card__title { font-size: 20px; font-weight: 600; color: var(--text-main); margin-bottom: 12px; }
.matrix-card__text { font-size: 14px; color: var(--text-sub); line-height: 1.8; margin-bottom: 16px; }
.matrix-card__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.matrix-tag {
  font-size: 12px; color: var(--text-sub);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-tag);
  padding: 3px 10px;
}

.small-card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.small-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-card);
  padding: 26px 22px;
  text-align: center;
  transition: all var(--transition-base);
  backdrop-filter: blur(14px);
}
.small-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,229,255,0.35);
  box-shadow: 0 12px 36px rgba(0,0,0,0.35), 0 0 24px rgba(0,229,255,0.08);
}
.small-card__icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: rgba(0,229,255,0.1);
  border: 1px solid rgba(0,229,255,0.25);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; color: var(--brand-cyan);
  margin: 0 auto 16px;
}
.small-card__title { font-size: 15px; font-weight: 600; color: var(--text-main); margin-bottom: 10px; }
.small-card__text { font-size: 13px; color: var(--text-sub); line-height: 1.65; }

/* ===== Comparison / Data Table ===== */
.comparison-section {
  background: linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-dark) 100%);
}
.comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: stretch; }
.comparison-col {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-card);
  padding: 36px;
  backdrop-filter: blur(16px);
  transition: all var(--transition-base);
}
.comparison-col:hover { box-shadow: var(--shadow-lg); }
.comparison-col--legacy { border-color: rgba(255,255,255,0.06); }
.comparison-col--legacy::before {
  content: ''; position: absolute; inset: 0; border-radius: 16px;
  background: repeating-linear-gradient(45deg, transparent 0 12px, rgba(255,255,255,0.015) 12px 13px);
  pointer-events: none;
}
.comparison-col--modern {
  border-color: rgba(0,229,255,0.25);
  background: rgba(0,229,255,0.04);
  box-shadow: 0 0 36px rgba(0,229,255,0.06), inset 0 1px 0 rgba(255,255,255,0.06);
}
.comparison-col h3 { font-size: 22px; font-weight: 700; color: var(--text-main); margin-bottom: 24px; display: flex; align-items: center; gap: 10px; }
.comparison-col h3 i { font-size: 18px; }
.comparison-col--legacy h3 { color: var(--text-sub); }
.comparison-col--legacy h3 i { color: var(--danger); }
.comparison-col--modern h3 i { color: var(--success); }
.comparison-list li {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 14px; color: var(--text-sub); line-height: 1.6;
}
.comparison-list li:last-child { border-bottom: none; }
.comparison-list li i.fa-check { color: var(--success); margin-top: 4px; }
.comparison-list li i.fa-xmark { color: var(--danger); margin-top: 4px; }
.metric-bar { margin-top: 30px; }
.metric-bar__row { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.metric-bar__label { width: 72px; font-size: 13px; color: var(--text-sub); flex-shrink: 0; }
.metric-bar__track { flex: 1; height: 8px; border-radius: 4px; background: rgba(255,255,255,0.08); overflow: hidden; }
.metric-bar__fill { height: 100%; border-radius: 4px; background: linear-gradient(90deg, rgba(0,229,255,0.5), var(--brand-cyan)); box-shadow: 0 0 10px rgba(0,229,255,0.3); transition: width 1s ease; }
.metric-bar__value { font-family: "Roboto Mono", monospace; font-size: 13px; color: var(--text-main); width: 48px; text-align: right; }

/* ===== Data Table ===== */
.data-table-wrap {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-card);
  overflow: hidden;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md);
}
.data-table-wrap table { margin: 0; width: 100%; }
.data-table-wrap thead th {
  background: rgba(0,229,255,0.08);
  color: var(--text-main);
  font-size: 13px; font-weight: 600;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(0,229,255,0.15);
  letter-spacing: 0.03em;
}
.data-table-wrap tbody td {
  padding: 14px 18px;
  font-size: 14px;
  color: var(--text-sub);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.data-table-wrap tbody tr:hover td { background: rgba(0,229,255,0.03); }
.data-table-wrap tbody tr:last-child td { border-bottom: none; }
.data-highlight { color: var(--brand-cyan); font-weight: 600; }
.data-success { color: var(--success); font-weight: 600; }

/* ===== FAQ ===== */
.faq-section { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: var(--radius-card);
  padding: 24px 28px;
  margin-bottom: 16px;
  backdrop-filter: blur(14px);
  transition: all var(--transition-base);
}
.faq-item:hover { border-color: rgba(0,229,255,0.2); box-shadow: var(--shadow-md); }
.faq-item h3 {
  display: flex; align-items: center; gap: 14px;
  font-size: 16px; font-weight: 600; color: var(--text-main);
  margin-bottom: 10px;
}
.faq-item h3 .faq-icon {
  width: 28px; height: 28px; border-radius: 8px; flex-shrink: 0;
  background: rgba(0,229,255,0.12);
  border: 1px solid rgba(0,229,255,0.25);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; color: var(--brand-cyan);
}
.faq-item p { font-size: 14px; color: var(--text-sub); line-height: 1.75; padding-left: 42px; }

/* ===== CTA Band ===== */
.cta-band {
  position: relative;
  background: linear-gradient(90deg, rgba(0,229,255,0.15) 0%, rgba(0,123,255,0.1) 50%, rgba(0,229,255,0.15) 100%);
  border-top: 1px solid rgba(0,229,255,0.2);
  border-bottom: 1px solid rgba(0,229,255,0.2);
  padding: 72px 0;
  text-align: center;
  overflow: hidden;
}
.cta-band::before {
  content: ''; position: absolute; inset: 0;
  background: repeating-linear-gradient(60deg, transparent 0 40px, rgba(0,229,255,0.03) 40px 41px);
  pointer-events: none;
}
.cta-band__title { font-size: clamp(24px, 2.6vw, 34px); font-weight: 800; color: var(--text-main); margin-bottom: 14px; position: relative; z-index: 2; }
.cta-band__title .highlight { color: var(--brand-cyan); text-shadow: 0 0 20px rgba(0,229,255,0.5); }
.cta-band__desc { font-size: 15px; color: var(--text-sub); max-width: 560px; margin: 0 auto 32px; position: relative; z-index: 2; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 48px; padding: 0 32px;
  border-radius: var(--radius-btn);
  font-size: 15px; font-weight: 600;
  border: none; cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
}
.btn:focus-visible { outline: 2px solid var(--accent-gold); outline-offset: 3px; }
.btn--primary {
  background: linear-gradient(135deg, rgba(0,229,255,0.9), rgba(0,123,255,0.85));
  color: #fff;
  box-shadow: 0 8px 28px rgba(0,229,255,0.35);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,229,255,0.55); color: #fff; text-shadow: 0 0 8px rgba(255,255,255,0.5); }
.btn--primary:active { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0,229,255,0.4); }
.btn--ghost {
  background: transparent;
  border: 1.5px solid rgba(0,229,255,0.5);
  color: var(--brand-cyan);
}
.btn--ghost:hover { background: rgba(0,229,255,0.1); border-color: var(--brand-cyan); color: var(--brand-cyan); transform: translateY(-2px); }
.btn--ghost:active { transform: translateY(-1px); }

/* ===== Footer ===== */
.site-footer {
  background: linear-gradient(180deg, rgba(13,27,46,0.95), rgba(10,18,32,0.98));
  border-top: 1px solid rgba(0,229,255,0.1);
  padding: 60px 0 0;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.footer__brand .logo { margin-bottom: 16px; }
.footer__desc { font-size: 13px; color: var(--text-sub); line-height: 1.75; max-width: 360px; }
.footer__col-title { font-size: 15px; font-weight: 600; color: var(--text-main); margin-bottom: 16px; letter-spacing: 0.02em; }
.footer__col ul li { margin-bottom: 10px; }
.footer__col ul li a, .footer__col ul li { font-size: 13px; color: var(--text-sub); transition: all var(--transition-fast); }
.footer__col ul li a:hover { color: var(--brand-cyan); padding-left: 4px; }
.footer__contact ul li { display: flex; align-items: center; gap: 8px; }
.footer__contact ul li i { color: var(--brand-cyan); font-size: 13px; width: 16px; text-align: center; }
.footer__bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding: 24px 0; flex-wrap: wrap; gap: 8px;
}
.footer__copy, .footer__icp { font-size: 13px; color: var(--text-dim); }
.footer__copy strong { color: var(--text-sub); }

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed; right: 20px; bottom: 20px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(13,27,46,0.9);
  border: 1px solid rgba(0,229,255,0.3);
  backdrop-filter: blur(16px);
  color: var(--brand-cyan);
  font-size: 16px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.back-to-top:hover { border-color: var(--brand-cyan); box-shadow: 0 4px 28px rgba(0,229,255,0.3); transform: translateY(-3px); }
.back-to-top:focus-visible { outline: 2px solid var(--accent-gold); outline-offset: 3px; }

/* ===== Responsive ===== */
@media screen and (max-width: 1024px) {
  .container { padding: 0 24px; }
  .main-nav ul li a { padding: 10px 12px; font-size: 13px; }
  .small-card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media screen and (max-width: 768px) {
  .main-nav ul { display: none; }
  .nav-toggle { display: flex; }
  .main-nav .container { height: 60px; }
  .top-bar__msg { display: none; }
  .page-hero { padding: 60px 0 32px; }
  .hero-tabs { flex-direction: column; align-items: stretch; padding: 8px; }
  .hero-tabs a { text-align: center; }
  .matrix-grid { grid-template-columns: 1fr; }
  .small-card-grid { grid-template-columns: 1fr; }
  .comparison-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .footer__bottom { flex-direction: column; text-align: center; }
  .section { padding: 64px 0; }
  .btn { width: 100%; }
  .matrix-card__img { height: 180px; }
  .comparison-col { padding: 28px 20px; }
  .faq-item { padding: 20px; }
  .faq-item p { padding-left: 0; margin-top: 8px; }
}
@media screen and (max-width: 520px) {
  .container { padding: 0 16px; }
  .logo__text { font-size: 16px; }
  .small-card-grid { grid-template-columns: 1fr; }
  .section__title::before { height: 20px; margin-right: 10px; }
  .back-to-top { width: 40px; height: 40px; right: 14px; bottom: 14px; }
}

/* roulang page: category2 */
/* ========== 设计变量 ========== */
:root {
  --bg-deep: #0A1220;
  --bg-dark: #0D1B2E;
  --bg-panel: #12263A;
  --accent: #00E5FF;
  --accent-dim: rgba(0, 229, 255, 0.12);
  --gold: #FFC24B;
  --green: #2DD4A7;
  --red: #FF4D6D;
  --text-main: #E8F0FF;
  --text-sub: #94A9C7;
  --text-dim: #5B7194;
  --glass-bg: rgba(255, 255, 255, 0.045);
  --glass-border: rgba(255, 255, 255, 0.10);
  --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.45);
  --container-max: 1200px;
  --space-section: clamp(60px, 8vw, 100px);
}

/* ========== Reset / 基础 ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  background: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .2s ease; }
a:hover { color: #fff; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ========== 按钮系统 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  padding: 0 28px;
  height: 42px;
  transition: all .25s ease;
  white-space: nowrap;
  letter-spacing: .03em;
}
.btn-primary {
  background: linear-gradient(135deg, rgba(0, 229, 255, .9), rgba(0, 123, 255, .85));
  color: #fff;
  box-shadow: 0 8px 28px rgba(0, 229, 255, 0.35);
  border: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 229, 255, 0.55);
  color: #fff;
  text-shadow: 0 0 8px rgba(255, 255, 255, .5);
}
.btn-primary:active { transform: translateY(0); box-shadow: 0 4px 16px rgba(0, 229, 255, .3); }
.btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid rgba(0, 229, 255, 0.5);
}
.btn-ghost:hover {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--accent);
  color: var(--accent);
}
.btn-lg { height: 50px; padding: 0 36px; font-size: 15px; }
.btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* ========== 顶部信息条 ========== */
.topbar {
  background: rgba(10, 18, 32, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  color: var(--text-sub);
  position: relative;
  z-index: 110;
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 32px;
  gap: 16px;
}
.topbar__domain {
  font-family: "Roboto Mono", "DIN Alternate", monospace;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-sub);
  letter-spacing: .04em;
}
.topbar__domain .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px rgba(45, 212, 167, .8);
  animation: pulse-dot 2s ease infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}
.topbar__notice {
  color: var(--text-sub);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 50%;
}
.topbar__login {
  color: var(--text-sub);
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: color .2s;
}
.topbar__login:hover { color: var(--accent); }
@media (max-width: 640px) {
  .topbar__notice { display: none; }
}

/* ========== 主导航 ========== */
.site-header {
  background: rgba(13, 27, 46, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.logo__icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(0, 229, 255, .25), rgba(0, 123, 255, .18));
  border: 1px solid rgba(0, 229, 255, .4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 16px;
  box-shadow: 0 0 16px rgba(0, 229, 255, .25);
}
.logo__text {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--text-main);
  background: linear-gradient(90deg, #fff, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.main-nav ul {
  display: flex;
  align-items: center;
  gap: 6px;
}
.main-nav a {
  position: relative;
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  border-radius: var(--radius-sm);
  transition: color .2s, background .2s;
}
.main-nav a:hover {
  color: var(--accent);
  background: rgba(0, 229, 255, .06);
}
.main-nav a.active {
  color: var(--accent);
  font-weight: 600;
}
.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(0, 229, 255, .6);
}
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, .12);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: rgba(255, 255, 255, .04);
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: transform .3s, opacity .3s;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }
  .main-nav {
    position: fixed;
    top: 100px;
    left: 0;
    right: 0;
    background: rgba(10, 18, 32, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 229, 255, .15);
    padding: 20px;
    transform: translateY(-120%);
    transition: transform .35s ease;
    z-index: 99;
  }
  .main-nav.is-open {
    transform: translateY(0);
  }
  .main-nav ul {
    flex-direction: column;
    gap: 4px;
    align-items: stretch;
  }
  .main-nav a {
    font-size: 18px;
    padding: 14px 20px;
    line-height: 1.4;
    border-radius: var(--radius-md);
  }
  .main-nav a.active {
    background: rgba(0, 229, 255, .08);
  }
  .main-nav a.active::after { display: none; }
}

/* ========== 分类 Hero ========== */
.category-hero {
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: center;
  background:
    linear-gradient(135deg, rgba(10, 18, 32, 0.92) 30%, rgba(0, 229, 255, 0.12) 100%),
    url('/assets/images/backpic/back-1.png') center / cover no-repeat;
  padding: 80px 0 120px;
  overflow: hidden;
}
.category-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
.category-hero::after {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.18), transparent 60%);
  pointer-events: none;
}
.category-hero__content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-dim);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  letter-spacing: .05em;
  margin-bottom: 20px;
}
.category-hero h1 {
  font-size: clamp(28px, 3.8vw, 52px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 14px;
  color: #fff;
}
.category-hero__subtitle {
  font-size: clamp(17px, 1.8vw, 22px);
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}
.category-hero__desc {
  color: var(--text-sub);
  font-size: clamp(14px, 1.1vw, 16px);
  line-height: 1.75;
  margin-bottom: 28px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Hero Tabs */
.hero-tabs {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 3;
  background: rgba(13, 27, 46, 0.6);
  backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.hero-tabs .container {
  display: flex;
  gap: 8px;
  overflow-x: auto;
}
.hero-tabs a {
  position: relative;
  padding: 16px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  white-space: nowrap;
  transition: color .2s;
}
.hero-tabs a:hover { color: var(--accent); }
.hero-tabs a.active {
  color: var(--accent);
  font-weight: 600;
}
.hero-tabs a.active::after {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(0, 229, 255, .8);
  border-radius: 2px 2px 0 0;
}

/* ========== 板块标题 ========== */
.section-head {
  margin-bottom: clamp(36px, 4vw, 56px);
}
.section-head--center {
  text-align: center;
}
.section-head__tag {
  display: inline-block;
  font-family: "Roboto Mono", monospace;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section-head h2 {
  font-size: clamp(24px, 2.6vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  position: relative;
  padding-left: 16px;
  margin-bottom: 12px;
}
.section-head--center h2 {
  padding-left: 0;
}
.section-head--center h2::before {
  display: none;
}
.section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 4px;
  background: var(--accent);
  border-radius: 4px;
  box-shadow: 0 0 10px rgba(0, 229, 255, .5);
}
.section-head p {
  color: var(--text-sub);
  font-size: 15px;
  max-width: 600px;
}
.section-head--center p {
  margin-left: auto;
  margin-right: auto;
}

/* ========== 内容矩阵 ========== */
.matrix-section {
  padding: var(--space-section) 0;
  background: var(--bg-dark);
  position: relative;
}
.matrix-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.matrix-section .container {
  position: relative;
  z-index: 2;
}
.matrix-large {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(20px, 3vw, 36px);
  margin-bottom: 40px;
}
.matrix-card {
  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.matrix-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 229, 255, 0.2);
  border-color: rgba(0, 229, 255, 0.3);
}
.matrix-card__thumb {
  position: relative;
  height: 240px;
  overflow: hidden;
}
.matrix-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.matrix-card:hover .matrix-card__thumb img {
  transform: scale(1.03);
}
.matrix-card__thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(10, 18, 32, 0.8));
}
.matrix-card__badge {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 2;
  background: rgba(10, 18, 32, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(0, 229, 255, 0.4);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  letter-spacing: .05em;
}
.matrix-card__body {
  padding: 24px 28px 28px;
}
.matrix-card__body h3 {
  font-size: clamp(17px, 1.4vw, 22px);
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-main);
}
.matrix-card__body p {
  color: var(--text-sub);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 16px;
}
.matrix-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.matrix-card__tags li {
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.2);
  color: var(--text-sub);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}
.link-more {
  font-size: 14px;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap .2s;
}
.link-more:hover {
  gap: 10px;
  color: #fff;
}

/* 四列小图卡 */
.matrix-small {
  margin-top: 32px;
}
.matrix-small .grid-x {
  row-gap: 20px;
}
.small-card {
  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  height: 100%;
  transition: transform .3s, box-shadow .3s, border-color .3s;
  position: relative;
  overflow: hidden;
}
.small-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: repeating-linear-gradient(135deg, transparent, transparent 6px, rgba(0, 229, 255, 0.03) 6px, rgba(0, 229, 255, 0.03) 7px);
  pointer-events: none;
}
.small-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 229, 255, 0.2);
  border-color: rgba(0, 229, 255, 0.3);
}
.small-card__icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--accent-dim);
  border: 1px solid rgba(0, 229, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--accent);
  margin-bottom: 18px;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
  transition: box-shadow .3s;
}
.small-card:hover .small-card__icon {
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.35);
}
.small-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}
.small-card p {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.65;
}

@media (max-width: 1024px) {
  .matrix-large {
    grid-template-columns: 1fr;
  }
  .matrix-card__thumb {
    height: 200px;
  }
}

/* ========== 数据表格 ========== */
.data-table-section {
  padding: var(--space-section) 0;
  background: var(--bg-deep);
  position: relative;
}
.data-table-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}
.data-table-wrap {
  max-width: 860px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 0;
  overflow-x: auto;
  box-shadow: var(--shadow-md);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.data-table thead th {
  background: rgba(0, 229, 255, 0.08);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.data-table tbody td {
  padding: 18px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-sub);
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: rgba(255, 255, 255, 0.03); }
.data-table tbody td strong {
  color: var(--text-main);
  font-family: "Roboto Mono", "DIN Alternate", monospace;
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  text-shadow: 0 0 12px rgba(0, 229, 255, .3);
}
.data-table tbody td:first-child {
  color: var(--text-main);
  font-weight: 500;
}

/* ========== FAQ ========== */
.faq-section {
  padding: var(--space-section) 0;
  background: var(--bg-dark);
}
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color .3s, box-shadow .3s;
}
.faq-item:hover {
  border-color: rgba(0, 229, 255, 0.25);
}
.faq-item.is-open {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.1);
}
.faq-item__q {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-main);
  text-align: left;
  transition: color .2s;
}
.faq-item__q:hover { color: var(--accent); }
.faq-item__icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform .3s, background .3s;
}
.faq-item.is-open .faq-item__icon {
  transform: rotate(45deg);
  background: rgba(0, 229, 255, 0.2);
}
.faq-item__a {
  display: none;
  padding: 0 20px 20px 60px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-sub);
  background: rgba(0, 0, 0, 0.15);
}
.faq-item.is-open .faq-item__a {
  display: block;
}

/* ========== CTA ========== */
.cta-band {
  padding: var(--space-section) 0;
  background:
    linear-gradient(135deg, rgba(0, 229, 255, 0.18), rgba(0, 123, 255, 0.08)),
    var(--bg-deep);
  position: relative;
  text-align: center;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  bottom: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.15), transparent 60%);
  pointer-events: none;
}
.cta-band__inner {
  position: relative;
  z-index: 2;
  max-width: 640px;
  margin: 0 auto;
}
.cta-band h2 {
  font-size: clamp(24px, 2.6vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.cta-band p {
  color: var(--text-sub);
  font-size: 15px;
  margin-bottom: 30px;
}
.cta-band__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ========== Footer ========== */
.site-footer {
  background: rgba(10, 18, 32, 0.95);
  border-top: 1px solid rgba(0, 229, 255, 0.1);
  padding: 60px 0 0;
  font-size: 13px;
  color: var(--text-sub);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer__brand .logo {
  margin-bottom: 16px;
}
.footer__brand .logo__text {
  font-size: 17px;
}
.footer__desc {
  color: var(--text-dim);
  line-height: 1.7;
  max-width: 320px;
  font-size: 13px;
}
.footer__col-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: .05em;
}
.footer__col ul li {
  margin-bottom: 10px;
}
.footer__col ul li a {
  color: var(--text-sub);
  font-size: 13px;
  transition: color .2s;
}
.footer__col ul li a:hover {
  color: var(--accent);
}
.footer__contact ul li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-sub);
  font-size: 13px;
}
.footer__contact ul li i {
  color: var(--accent);
  width: 16px;
  text-align: center;
}
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.footer__copy {
  color: var(--text-dim);
  font-size: 13px;
}
.footer__copy strong {
  color: var(--text-sub);
  font-weight: 600;
}
.footer__icp {
  color: var(--text-dim);
  font-size: 12px;
}

@media (max-width: 860px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer__brand {
    grid-column: 1 / -1;
  }
}
@media (max-width: 640px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ========== 响应式补充 ========== */
@media (max-width: 640px) {
  .category-hero {
    min-height: 260px;
    padding: 60px 0 110px;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .hero-tabs a {
    padding: 14px 16px;
    font-size: 13px;
  }
  .matrix-card__body {
    padding: 20px;
  }
  .matrix-card__thumb {
    height: 180px;
  }
  .data-table-wrap {
    border-radius: var(--radius-md);
  }
  .faq-item__a {
    padding: 0 16px 16px 50px;
  }
  .cta-band__actions .btn {
    width: 100%;
  }
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-deep);
}
::-webkit-scrollbar-thumb {
  background: rgba(0, 229, 255, 0.25);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 229, 255, 0.4);
}

/* Focus 可见性 */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}