:root {
    --cream: #fff8ec;
    --cream-2: #fff1d6;
    --navy: #13264b;
    --navy-2: #223b71;
    --orange: #ff8b3d;
    --orange-2: #ffb36b;
    --purple: #b8a7ff;
    --purple-2: #eee9ff;
    --ink: #1f2a44;
    --muted: #68748b;
    --line: rgba(31, 42, 68, .12);
    --card: rgba(255, 255, 255, .86);
    --shadow: 0 18px 45px rgba(19, 38, 75, .12);
    --radius: 26px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 12% 8%, rgba(255, 139, 61, .18), transparent 28rem),
        radial-gradient(circle at 92% 12%, rgba(184, 167, 255, .28), transparent 26rem),
        linear-gradient(180deg, var(--cream), #ffffff 45%, #fff9ef 100%);
    line-height: 1.72;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea, select { font: inherit; }
.container { width: min(1180px, calc(100% - 36px)); margin: 0 auto; }
.skip-link { position: absolute; left: -999px; top: 10px; background: var(--navy); color: #fff; padding: 10px 14px; border-radius: 12px; z-index: 20; }
.skip-link:focus { left: 12px; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(255, 248, 236, .86); backdrop-filter: blur(18px); border-bottom: 1px solid rgba(19, 38, 75, .08); }
.header-inner { min-height: 76px; display: flex; align-items: center; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 202px; }
.brand-mark { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 16px; background: linear-gradient(135deg, var(--navy), var(--purple)); color: #fff; font-weight: 900; box-shadow: 0 12px 22px rgba(19,38,75,.2); }
.brand strong { display: block; font-size: 1.2rem; letter-spacing: .03em; color: var(--navy); }
.brand small { display: block; color: var(--muted); font-size: .78rem; margin-top: -2px; }
.site-nav { display: flex; gap: 8px; align-items: center; margin-left: auto; }
.site-nav a { padding: 9px 12px; border-radius: 999px; color: var(--navy); font-weight: 700; font-size: .95rem; }
.site-nav a:hover, .site-nav a.active { background: var(--navy); color: #fff; }
.domain-pill { display: flex; flex-direction: column; align-items: flex-start; min-width: 124px; padding: 7px 12px; border-radius: 16px; background: #fff; border: 1px solid var(--line); box-shadow: 0 8px 20px rgba(19,38,75,.06); }
.domain-pill span { color: var(--muted); font-size: .72rem; }
.domain-pill strong { color: var(--orange); font-size: .82rem; max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-toggle { display: none; margin-left: auto; border: 0; background: var(--navy); color: #fff; width: 44px; height: 44px; border-radius: 14px; }
main { overflow: hidden; }
.hero { padding: 74px 0 48px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 44px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 14px; padding: 7px 12px; border-radius: 999px; background: #fff; color: var(--orange); font-weight: 800; box-shadow: var(--shadow); }
.eyebrow::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--orange); }
h1, h2, h3 { color: var(--navy); line-height: 1.18; margin: 0; }
h1 { font-size: clamp(2.15rem, 5vw, 4.85rem); letter-spacing: -.05em; }
h2 { font-size: clamp(1.7rem, 3vw, 2.55rem); letter-spacing: -.035em; }
h3 { font-size: 1.18rem; }
.lead { color: var(--muted); font-size: clamp(1.02rem, 1.7vw, 1.22rem); margin: 20px 0 0; max-width: 680px; }
.hero-actions, .section-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 999px; padding: 12px 18px; font-weight: 800; cursor: pointer; transition: .2s ease; }
.btn.primary { background: var(--navy); color: #fff; box-shadow: 0 14px 26px rgba(19,38,75,.2); }
.btn.secondary { background: #fff; color: var(--navy); border: 1px solid var(--line); }
.btn.orange { background: var(--orange); color: #fff; }
.btn:hover { transform: translateY(-2px); }
.stat-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 34px; }
.stat { padding: 16px; border-radius: 20px; background: rgba(255,255,255,.82); border: 1px solid var(--line); }
.stat strong { display: block; color: var(--navy); font-size: 1.5rem; }
.stat span { display: block; color: var(--muted); font-size: .88rem; }
.hero-art { position: relative; }
.hero-art::after { content: ""; position: absolute; width: 140px; height: 140px; border-radius: 50%; background: rgba(255, 139, 61, .16); right: -12px; bottom: -18px; z-index: -1; }
.hero-card { border-radius: 34px; background: rgba(255,255,255,.82); border: 1px solid var(--line); padding: 18px; box-shadow: var(--shadow); }
.section { padding: 58px 0; }
.section.soft { background: rgba(255,255,255,.46); border-block: 1px solid rgba(19,38,75,.06); }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; margin-bottom: 26px; }
.section-head p { color: var(--muted); margin: 10px 0 0; max-width: 690px; }
.grid { display: grid; gap: 20px; }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: 0 14px 34px rgba(19,38,75,.08); position: relative; overflow: hidden; }
.card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 5px; background: linear-gradient(90deg, var(--orange), var(--purple)); opacity: .85; }
.card p { color: var(--muted); margin: 10px 0 0; }
.cover { border-radius: 22px; overflow: hidden; margin-bottom: 16px; background: var(--cream-2); border: 1px solid rgba(19,38,75,.08); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; }
.tag { display: inline-flex; align-items: center; border-radius: 999px; padding: 5px 10px; background: var(--purple-2); color: var(--navy); font-size: .82rem; font-weight: 800; }
.tag.orange { background: #ffe4cd; color: #9a420d; }
.meta-row { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: .9rem; margin-top: 14px; }
.interaction-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.icon-btn { border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--navy); padding: 8px 12px; cursor: pointer; font-weight: 800; }
.icon-btn.is-on { background: var(--orange); color: #fff; border-color: transparent; }
.topic-card { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; }
.topic-icon { width: 52px; height: 52px; border-radius: 18px; display: grid; place-items: center; background: var(--navy); color: #fff; font-weight: 900; }
.rating-box { display: flex; align-items: center; gap: 14px; }
.stars { letter-spacing: 2px; color: #ff9f1c; white-space: nowrap; }
.score { color: var(--navy); font-size: 2rem; font-weight: 900; }
.progress { height: 12px; border-radius: 999px; background: #eef1f7; overflow: hidden; margin-top: 12px; }
.progress span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--orange), var(--purple)); width: 60%; }
.mt-14 { margin-top: 14px; }
.mt-20 { margin-top: 20px; }
.mt-22 { margin-top: 22px; }
.progress .w-72 { width: 72%; }
.progress .w-76 { width: 76%; }
.progress .w-78 { width: 78%; }
.progress .w-82 { width: 82%; }
.progress .w-88 { width: 88%; }

.challenge { display: grid; grid-template-columns: .9fr 1.1fr; gap: 24px; align-items: center; }
.note { padding: 14px 16px; border-radius: 18px; background: rgba(255, 139, 61, .11); color: #78430f; border: 1px solid rgba(255, 139, 61, .22); }
.feed { display: grid; gap: 16px; }
.feed-item { display: grid; grid-template-columns: 54px 1fr; gap: 14px; padding: 18px; border-radius: 24px; background: #fff; border: 1px solid var(--line); }
.avatar { width: 54px; height: 54px; border-radius: 18px; background: linear-gradient(135deg, var(--navy), var(--purple)); display: grid; place-items: center; color: #fff; font-weight: 900; box-shadow: 0 8px 16px rgba(19,38,75,.16); }
.bubble { position: relative; background: var(--cream); border: 1px solid rgba(19,38,75,.08); border-radius: 20px; padding: 14px; }
.bubble::before { content: ""; position: absolute; left: -8px; top: 18px; width: 14px; height: 14px; background: var(--cream); border-left: 1px solid rgba(19,38,75,.08); border-bottom: 1px solid rgba(19,38,75,.08); transform: rotate(45deg); }
.bubble strong { color: var(--navy); }
.bubble p { margin: 6px 0 0; color: var(--muted); }
.cta { border-radius: 34px; background: linear-gradient(135deg, var(--navy), #304b8e); color: #fff; padding: 34px; display: grid; grid-template-columns: 1fr auto; gap: 22px; align-items: center; box-shadow: var(--shadow); }
.cta h2, .cta p { color: #fff; }
.cta p { opacity: .82; margin: 10px 0 0; }
.faq { display: grid; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 20px; overflow: hidden; }
.faq-item button { width: 100%; background: transparent; border: 0; color: var(--navy); padding: 16px 18px; font-weight: 900; display: flex; justify-content: space-between; align-items: center; cursor: pointer; text-align: left; }
.faq-panel { display: none; padding: 0 18px 18px; color: var(--muted); }
.faq-item.open .faq-panel { display: block; }
.page-hero { padding: 58px 0 24px; }
.page-hero .panel { border-radius: 34px; background: rgba(255,255,255,.76); border: 1px solid var(--line); padding: 36px; box-shadow: var(--shadow); display: grid; grid-template-columns: 1.2fr .8fr; gap: 26px; align-items: center; }
.timeline { position: relative; display: grid; gap: 16px; }
.timeline::before { content: ""; position: absolute; left: 19px; top: 10px; bottom: 10px; width: 2px; background: rgba(19,38,75,.12); }
.timeline-item { position: relative; padding-left: 54px; }
.timeline-item::before { content: ""; position: absolute; left: 10px; top: 6px; width: 20px; height: 20px; border-radius: 50%; background: var(--orange); border: 5px solid #fff; box-shadow: 0 0 0 1px var(--line); }
.table-card { overflow: auto; padding: 0; }
table { width: 100%; border-collapse: collapse; min-width: 680px; background: #fff; }
th, td { padding: 15px 18px; border-bottom: 1px solid var(--line); text-align: left; }
th { color: var(--navy); background: var(--cream); }
td { color: var(--muted); }
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.filter-btn { border: 1px solid var(--line); background: #fff; color: var(--navy); border-radius: 999px; padding: 9px 14px; cursor: pointer; font-weight: 800; }
.filter-btn.active { background: var(--navy); color: #fff; }
.video-frame { aspect-ratio: 16 / 9; border-radius: 24px; background: linear-gradient(135deg, var(--navy), var(--purple)); display: grid; place-items: center; color: #fff; margin-bottom: 16px; position: relative; overflow: hidden; }
.video-frame::before { content: ""; position: absolute; width: 170px; height: 170px; border-radius: 50%; background: rgba(255,255,255,.12); right: -36px; top: -44px; }
.play { width: 66px; height: 66px; border-radius: 50%; background: #fff; display: grid; place-items: center; color: var(--orange); font-weight: 900; box-shadow: 0 12px 26px rgba(0,0,0,.18); z-index: 1; }
.form { display: grid; gap: 14px; }
.form label { display: grid; gap: 7px; color: var(--navy); font-weight: 800; }
.form input, .form textarea, .form select { width: 100%; border: 1px solid var(--line); border-radius: 16px; background: #fff; padding: 12px 14px; color: var(--ink); }
.form textarea { min-height: 132px; resize: vertical; }
.form-message { color: var(--orange); font-weight: 800; min-height: 26px; }
.site-footer { margin-top: 46px; padding: 42px 0; background: #0f2145; color: rgba(255,255,255,.78); }
.footer-grid { display: grid; grid-template-columns: 1.1fr .95fr .95fr; gap: 24px; }
.footer-brand { font-size: 1.45rem; font-weight: 900; color: #fff; }
.site-footer h2 { font-size: 1.05rem; color: #fff; margin-bottom: 8px; }
.site-footer p { margin: 8px 0 0; }
.update-date { color: #fff; font-weight: 900; }
@media (max-width: 980px) {
    .hero-grid, .page-hero .panel, .challenge, .cta { grid-template-columns: 1fr; }
    .grid.three, .grid.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .site-nav { position: absolute; left: 18px; right: 18px; top: 76px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow); display: none; flex-direction: column; align-items: stretch; }
    .site-nav.open { display: flex; }
    .site-nav a { border-radius: 14px; }
    .nav-toggle { display: block; }
    .domain-pill { display: none; }
}
@media (max-width: 680px) {
    .container { width: min(100% - 24px, 1180px); }
    .hero { padding-top: 42px; }
    .grid.two, .grid.three, .grid.four { grid-template-columns: 1fr; }
    .stat-row { grid-template-columns: 1fr; }
    .section-head { display: block; }
    .feed-item { grid-template-columns: 1fr; }
    .bubble::before { display: none; }
    .footer-grid { grid-template-columns: 1fr; }
    .cta { padding: 26px; }
}