:root {
  --bg: #f8fafc;
  --panel: rgba(255,255,255,.88);
  --panel-strong: #ffffff;
  --text: #111827;
  --muted: #667085;
  --line: rgba(15,23,42,.09);
  --soft: #eef2ff;
  --accent: #111827;
  --accent-2: #8b5cf6;
  --accent-3: #06b6d4;
  --radius-lg: 32px;
  --radius-md: 22px;
  --shadow: 0 24px 80px rgba(15,23,42,.08);
  --shadow-soft: 0 12px 36px rgba(15,23,42,.06);
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(139,92,246,.14), transparent 32rem),
    radial-gradient(circle at top right, rgba(6,182,212,.12), transparent 28rem),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
}
a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }
button, input, textarea { font: inherit; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(22px);
  background: rgba(248,250,252,.78);
  border-bottom: 1px solid var(--line);
}
.nav-wrap, .search-bar, main, .site-footer .footer-grid {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}
.nav-wrap {
  min-height: 82px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand-logo, .footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}
.brand-logo img, .footer-logo img {
  border-radius: 14px;
  box-shadow: var(--shadow-soft);
}
.brand-logo span { display: grid; line-height: 1.15; }
.brand-logo strong { font-size: 19px; letter-spacing: .02em; }
.brand-logo em { font-style: normal; font-size: 12px; color: var(--muted); }
.main-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}
.main-nav a {
  padding: 10px 14px;
  color: #344054;
  border-radius: 999px;
  transition: background .24s ease, transform .24s ease, color .24s ease;
}
.main-nav a:hover, .main-nav a.is-active {
  color: var(--text);
  background: rgba(17,24,39,.06);
  transform: translateY(-1px);
}
.nav-cta, .button-primary, .button-soft, .search-bar button, .form-card button {
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  transition: transform .24s ease, box-shadow .24s ease, background .24s ease;
}
.nav-cta, .button-primary, .form-card button {
  color: #fff;
  background: var(--accent);
  padding: 11px 18px;
  box-shadow: 0 16px 34px rgba(17,24,39,.16);
}
.nav-cta:hover, .button-primary:hover, .form-card button:hover { transform: translateY(-2px); }
.search-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 0 0 18px;
}
.search-bar input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 14px 18px;
  outline: none;
  background: rgba(255,255,255,.72);
}
.search-bar input:focus { border-color: rgba(139,92,246,.45); box-shadow: 0 0 0 5px rgba(139,92,246,.08); }
.search-bar button { padding: 0 22px; color: var(--text); background: #fff; border: 1px solid var(--line); }
.search-bar p { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 13px; }
main { padding: 52px 0 72px; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr);
  gap: 42px;
  align-items: center;
  min-height: 590px;
}
.kicker {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.72);
  color: #475467;
  font-size: 14px;
}
h1, h2, h3, h4 { line-height: 1.18; margin: 0; letter-spacing: -.03em; }
h1 { font-size: clamp(42px, 7vw, 78px); margin-top: 26px; max-width: 760px; }
h2 { font-size: clamp(28px, 4vw, 46px); }
h3 { font-size: 21px; }
p { margin: 0; }
.lead { margin-top: 22px; color: var(--muted); font-size: 18px; max-width: 720px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; align-items: center; }
.button-soft {
  padding: 11px 18px;
  color: var(--text);
  background: rgba(255,255,255,.74);
  border: 1px solid var(--line);
}
.domain-pill {
  margin-top: 28px;
  display: inline-flex;
  padding: 12px 16px;
  border-radius: 999px;
  background: rgba(255,255,255,.68);
  border: 1px solid var(--line);
  color: #475467;
}
.hero-card, .glass-card, .video-card, .board-card, .review-card, .faq-item, .form-card, .simple-card, .notice-card {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}
.hero-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  transform: translateZ(0);
}
.hero-card figure { margin: 0; }
.hero-card figcaption, .image-note {
  padding: 14px 18px;
  color: var(--muted);
  font-size: 13px;
  background: rgba(255,255,255,.82);
}
.hero-meta {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 70px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.hero-meta span, .tag {
  display: inline-flex;
  padding: 7px 10px;
  border-radius: 999px;
  color: #344054;
  background: rgba(255,255,255,.82);
  border: 1px solid rgba(255,255,255,.5);
  font-size: 13px;
}
.section { margin-top: 96px; }
.section-head {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: end;
  margin-bottom: 28px;
}
.section-head p { color: var(--muted); max-width: 620px; }
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 18px;
}
.glass-card, .simple-card, .notice-card {
  padding: 28px;
  border-radius: var(--radius-md);
}
.glass-card p, .simple-card p, .notice-card p { color: var(--muted); margin-top: 10px; }
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.video-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform .28s ease, box-shadow .28s ease;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.video-media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #e5e7eb;
}
.video-media img, .video-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease, opacity .3s ease;
}
.video-card:hover .video-media img { transform: scale(1.04); opacity: .82; }
.video-media video {
  position: absolute;
  inset: 0;
  opacity: 0;
}
.video-card:hover video { opacity: .36; }
.play-badge {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 68px;
  height: 68px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: rgba(17,24,39,.82);
  color: #fff;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: scale(.92);
  transition: opacity .28s ease, transform .28s ease;
}
.video-card:hover .play-badge { opacity: 1; transform: scale(1); }
.video-body { padding: 20px; }
.video-body p { color: var(--muted); margin-top: 10px; }
.video-stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
  color: #475467;
  font-size: 13px;
}
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tag { background: #f2f4f7; }
.board-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.board-card {
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform .24s ease, background .24s ease;
}
.board-card:hover { transform: translateY(-4px); background: #fff; }
.board-card .count { color: var(--accent-2); font-weight: 700; margin-top: 16px; }
.board-card p { color: var(--muted); margin-top: 10px; }
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.stat-card {
  padding: 26px;
  border-radius: var(--radius-md);
  background: #111827;
  color: #fff;
}
.stat-card strong { display: block; font-size: 36px; line-height: 1; }
.stat-card span { color: rgba(255,255,255,.7); }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.review-card { border-radius: var(--radius-md); padding: 24px; }
.review-card blockquote { margin: 0; color: #344054; }
.review-card cite { display: block; margin-top: 18px; font-style: normal; color: var(--muted); }
.faq-list { display: grid; gap: 12px; }
.faq-item { border-radius: 20px; overflow: hidden; }
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 22px;
  border: 0;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  color: var(--muted);
  padding: 0 22px;
  transition: max-height .28s ease, padding .28s ease;
}
.faq-item.is-open .faq-answer { max-height: 220px; padding: 0 22px 20px; }
.join-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 18px; }
.form-card { padding: 28px; border-radius: var(--radius-md); }
.form-card form { display: grid; gap: 12px; margin-top: 18px; }
.form-card input, .form-card textarea {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  background: #fff;
  outline: none;
}
.form-card textarea { min-height: 118px; resize: vertical; }
.form-note { color: var(--muted); font-size: 13px; margin-top: 12px; }
.page-hero {
  padding: 64px 0 28px;
  display: grid;
  gap: 18px;
  max-width: 880px;
}
.page-hero h1 { margin-top: 12px; }
.breadcrumb { color: var(--muted); font-size: 14px; }
.content-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 22px; align-items: start; }
.list-stack { display: grid; gap: 14px; }
.share-row { display: flex; flex-wrap: wrap; gap: 10px; }
.share-card {
  padding: 12px 14px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: #475467;
}
.site-footer {
  background: #0b1220;
  color: #d0d5dd;
  padding: 56px 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr .7fr .8fr 1.1fr;
  gap: 30px;
}
.footer-logo { color: #fff; font-weight: 800; margin-bottom: 14px; }
.site-footer h2 { font-size: 16px; color: #fff; margin-bottom: 14px; letter-spacing: 0; }
.site-footer a { display: block; color: #d0d5dd; margin: 8px 0; }
.site-footer span:not(.footer-logo span) {
  display: inline-flex;
  margin: 4px 6px 4px 0;
  padding: 5px 9px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
}
@media (max-width: 980px) {
  .nav-wrap { flex-wrap: wrap; gap: 12px; padding: 14px 0; }
  .main-nav { order: 3; width: 100%; overflow-x: auto; margin-left: 0; padding-bottom: 4px; }
  .hero, .content-grid, .join-grid { grid-template-columns: 1fr; min-height: auto; }
  .video-grid, .board-grid, .intro-grid, .review-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats-row, .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .nav-wrap, .search-bar, main, .site-footer .footer-grid { width: min(calc(100% - 22px), var(--max)); }
  .search-bar { grid-template-columns: 1fr; }
  .hero { gap: 24px; padding-top: 12px; }
  h1 { font-size: 40px; }
  .section { margin-top: 64px; }
  .section-head { display: grid; }
  .video-grid, .board-grid, .intro-grid, .review-grid, .stats-row, .footer-grid { grid-template-columns: 1fr; }
  .nav-cta { margin-left: auto; }
}