:root {
  --cream: #fff8eb;
  --cream-2: #fffdf7;
  --ink: #14304f;
  --blue: #17345f;
  --blue-soft: #eaf1ff;
  --orange: #ff8b3d;
  --orange-soft: #fff0e6;
  --purple: #bca7ff;
  --purple-soft: #f1edff;
  --green-soft: #e8f7ee;
  --line: rgba(20, 48, 79, .12);
  --shadow: 0 18px 45px rgba(23, 52, 95, .12);
  --radius: 26px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(188,167,255,.28), transparent 32rem),
    radial-gradient(circle at top right, rgba(255,139,61,.22), transparent 28rem),
    var(--cream);
  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 { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 248, 235, .86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; letter-spacing: .02em; }
.brand-mark {
  width: 46px; height: 46px; display: grid; place-items: center; border-radius: 16px;
  background: linear-gradient(135deg, var(--blue), #2f58a2 55%, var(--purple)); color: #fff;
  box-shadow: 0 12px 28px rgba(23,52,95,.18);
}
.brand-text { font-size: 21px; }
.main-nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.main-nav a { padding: 9px 13px; border-radius: 999px; font-weight: 700; font-size: 14px; color: rgba(20,48,79,.78); }
.main-nav a:hover, .main-nav a.active { background: #fff; color: var(--blue); box-shadow: 0 8px 18px rgba(23,52,95,.08); }
.nav-toggle { display: none; border: 0; border-radius: 12px; background: var(--blue); color: #fff; width: 44px; height: 44px; font-size: 22px; }
.hero { padding: 72px 0 44px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(330px, .92fr); gap: 34px; align-items: center; }
.kicker { display: inline-flex; align-items: center; gap: 8px; padding: 8px 13px; border-radius: 999px; background: #fff; box-shadow: 0 8px 22px rgba(23,52,95,.07); font-size: 14px; font-weight: 800; color: var(--orange); }
.kicker::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 0 5px rgba(255,139,61,.16); }
h1, h2, h3 { line-height: 1.2; margin: 0; color: var(--blue); }
h1 { margin-top: 18px; font-size: clamp(38px, 6vw, 72px); letter-spacing: -.045em; }
.hero p.lead { font-size: 18px; max-width: 720px; color: rgba(20,48,79,.78); }
.hero-actions, .section-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
.btn { display: inline-flex; align-items: center; gap: 8px; border-radius: 999px; padding: 13px 18px; font-weight: 900; border: 1px solid transparent; cursor: pointer; }
.btn-primary { background: var(--orange); color: #fff; box-shadow: 0 16px 28px rgba(255,139,61,.25); }
.btn-secondary { background: #fff; color: var(--blue); border-color: var(--line); }
.hero-card { position: relative; border-radius: 34px; background: rgba(255,255,255,.74); padding: 20px; box-shadow: var(--shadow); border: 1px solid rgba(255,255,255,.7); }
.hero-card img { border-radius: 25px; width: 100%; background: var(--blue-soft); }
.float-note { position: absolute; right: 24px; bottom: 24px; max-width: 250px; padding: 14px 16px; border-radius: 20px; background: rgba(255,255,255,.92); box-shadow: 0 15px 35px rgba(20,48,79,.12); font-weight: 800; }
.pill-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 24px; }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 8px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--line); font-size: 13px; font-weight: 800; color: rgba(20,48,79,.75); }
.section { padding: 54px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin-bottom: 24px; }
.section-head p { max-width: 640px; margin: 10px 0 0; color: rgba(20,48,79,.7); }
.section-title { font-size: clamp(28px, 4vw, 44px); letter-spacing: -.03em; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card { background: rgba(255,255,255,.82); border: 1px solid rgba(20,48,79,.1); border-radius: var(--radius); padding: 22px; box-shadow: 0 10px 28px rgba(23,52,95,.06); }
.card h3 { font-size: 20px; margin-bottom: 9px; }
.card p { color: rgba(20,48,79,.72); margin: 0; }
.card .meta { margin-top: 14px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; color: rgba(20,48,79,.62); font-size: 13px; font-weight: 750; }
.cover-card { overflow: hidden; padding: 0; }
.cover-card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; background: var(--blue-soft); }
.cover-body { padding: 20px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.tag { border-radius: 999px; background: var(--purple-soft); color: #5b4a9a; padding: 6px 10px; font-size: 12px; font-weight: 850; }
.tag.orange { background: var(--orange-soft); color: #b2531e; }
.tag.blue { background: var(--blue-soft); color: #2b4d83; }
.interact { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.interact button, .ghost-chip { border: 1px solid var(--line); background: #fff; color: var(--blue); border-radius: 999px; padding: 8px 11px; font-weight: 800; font-size: 13px; }
.topic-card { display: flex; gap: 16px; align-items: flex-start; }
.topic-icon { flex: 0 0 54px; height: 54px; border-radius: 19px; display: grid; place-items: center; background: var(--orange-soft); font-size: 25px; }
.rating-stars { letter-spacing: 2px; color: var(--orange); font-size: 19px; }
.score { display: inline-grid; place-items: center; min-width: 62px; height: 62px; border-radius: 21px; background: var(--blue); color: #fff; font-weight: 950; font-size: 24px; }
.score-line { display: flex; align-items: center; gap: 14px; margin-top: 12px; }
.avatar-row { display: flex; align-items: center; }
.avatar { width: 40px; height: 40px; border-radius: 50%; border: 3px solid #fff; background: linear-gradient(135deg, var(--purple), var(--orange)); margin-left: -9px; box-shadow: 0 6px 14px rgba(20,48,79,.12); }
.avatar:first-child { margin-left: 0; }
.comment { position: relative; background: #fff; border-radius: 22px; padding: 18px; border: 1px solid var(--line); }
.comment::after { content: ""; position: absolute; left: 26px; bottom: -9px; width: 18px; height: 18px; background: #fff; transform: rotate(45deg); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.notice { background: linear-gradient(135deg, rgba(23,52,95,.94), rgba(85,74,158,.9)); color: #fff; border-radius: 34px; padding: 32px; overflow: hidden; position: relative; }
.notice h2, .notice h3 { color: #fff; }
.notice p { color: rgba(255,255,255,.82); }
.notice .btn-secondary { color: var(--blue); }
.notice::before { content: ""; position: absolute; right: -70px; top: -70px; width: 220px; height: 220px; border-radius: 50%; background: rgba(255,139,61,.22); }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 16px 18px; margin-bottom: 12px; }
.faq summary { cursor: pointer; font-weight: 900; color: var(--blue); }
.faq p { margin: 12px 0 0; color: rgba(20,48,79,.72); }
.breadcrumb { padding: 20px 0 0; color: rgba(20,48,79,.62); font-size: 14px; font-weight: 750; }
.breadcrumb a { color: var(--blue); }
.page-hero { padding: 44px 0 24px; }
.page-hero .lead { max-width: 760px; color: rgba(20,48,79,.76); font-size: 18px; }
.timeline { position: relative; padding-left: 22px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 7px; bottom: 7px; width: 2px; background: var(--line); }
.timeline .item { position: relative; margin-bottom: 18px; padding: 16px; background: #fff; border-radius: 18px; border: 1px solid var(--line); }
.timeline .item::before { content: ""; position: absolute; left: -21px; top: 22px; width: 12px; height: 12px; border-radius: 50%; background: var(--orange); }
.tabs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.tab-btn { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 9px 14px; cursor: pointer; font-weight: 900; color: var(--blue); }
.tab-btn.active { background: var(--blue); color: #fff; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.video-card { display: grid; grid-template-columns: 180px minmax(0,1fr); gap: 18px; align-items: center; }
.video-thumb { border-radius: 22px; overflow: hidden; background: var(--purple-soft); position: relative; }
.video-thumb::after { content: "▶"; position: absolute; inset: 0; display: grid; place-items: center; color: #fff; font-size: 34px; text-shadow: 0 4px 18px rgba(20,48,79,.45); }
.form { display: grid; gap: 14px; }
.form label { font-weight: 900; color: var(--blue); }
.form input, .form textarea, .form select { width: 100%; border: 1px solid var(--line); border-radius: 17px; padding: 13px 14px; background: #fff; color: var(--ink); font: inherit; }
.form textarea { min-height: 130px; resize: vertical; }
.site-footer { margin-top: 50px; padding: 44px 0; background: #102947; color: rgba(255,255,255,.78); }
.footer-grid { display: grid; grid-template-columns: 1.4fr .7fr 1fr; gap: 28px; }
.site-footer h3, .footer-brand { color: #fff; margin-bottom: 10px; font-weight: 950; }
.site-footer a { display: block; margin: 8px 0; color: rgba(255,255,255,.8); }
.domain-box { margin-top: 18px; padding: 16px; border-radius: 20px; background: rgba(255,255,255,.72); border: 1px solid var(--line); display: flex; justify-content: space-between; gap: 12px; align-items: center; flex-wrap: wrap; }
.copy-result { font-weight: 850; color: var(--orange); }
.muted { color: rgba(20,48,79,.62); }
.sample-label { font-size: 12px; color: rgba(20,48,79,.6); font-weight: 850; }
@media (max-width: 940px) {
  .hero-grid, .grid-3, .grid-4, .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .hero-grid { align-items: start; }
  .main-nav { display: none; position: absolute; left: 16px; right: 16px; top: 74px; background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 12px; box-shadow: var(--shadow); }
  .main-nav.open { display: grid; grid-template-columns: 1fr 1fr; }
  .nav-toggle { display: inline-grid; place-items: center; }
}
@media (max-width: 680px) {
  .container { width: min(100% - 22px, 1180px); }
  .hero { padding-top: 42px; }
  .hero-grid, .grid-3, .grid-4, .footer-grid { grid-template-columns: 1fr; }
  .section-head { display: block; }
  .video-card { grid-template-columns: 1fr; }
  .float-note { position: static; margin-top: 14px; max-width: none; }
  .main-nav.open { grid-template-columns: 1fr; }
  h1 { font-size: clamp(34px, 12vw, 50px); }
}