:root {
    --ink: #25302d;
    --muted: #65706b;
    --deep: #16372f;
    --deep-2: #205246;
    --leaf: #6f8a68;
    --sand: #f6efe3;
    --paper: #fffaf1;
    --mist: #edf2ed;
    --line: rgba(37, 48, 45, .13);
    --shadow: 0 22px 60px rgba(17, 42, 36, .12);
    --radius: 24px;
    --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.72;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }
.container { width: min(100% - 40px, var(--max)); margin: 0 auto; }
.narrow { width: min(100% - 40px, 860px); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 250, 241, .88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
}
.nav-wrap { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: .08em; }
.brand-mark { width: 40px; height: 40px; border-radius: 14px; display: grid; place-items: center; color: var(--paper); background: linear-gradient(135deg, var(--deep), var(--leaf)); box-shadow: 0 10px 26px rgba(22, 55, 47, .22); }
.brand-text { font-size: 20px; }
.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav a { padding: 10px 13px; border-radius: 999px; color: var(--muted); font-size: 15px; }
.main-nav a:hover, .main-nav a.active { background: var(--mist); color: var(--deep); }
.nav-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--line); background: var(--paper); border-radius: 14px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--deep); margin: 4px auto; }
.hero { padding: 76px 0 58px; }
.immersive { background:
    radial-gradient(circle at 20% 20%, rgba(111, 138, 104, .18), transparent 30%),
    linear-gradient(180deg, #fffaf1 0%, #f4ecdf 100%);
}
.hero-grid, .split-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr); gap: 54px; align-items: center; }
.split-grid.reverse { grid-template-columns: minmax(320px, .95fr) minmax(0, 1.05fr); }
.eyebrow { margin: 0 0 14px; color: var(--leaf); font-weight: 800; letter-spacing: .12em; text-transform: uppercase; font-size: 13px; }
h1, h2, h3 { margin: 0 0 14px; line-height: 1.18; color: var(--deep); }
h1 { font-size: clamp(38px, 7vw, 76px); letter-spacing: -.05em; }
h2 { font-size: clamp(28px, 4vw, 46px); letter-spacing: -.035em; }
h3 { font-size: 21px; }
p { margin: 0 0 18px; color: var(--muted); }
.lead { font-size: 19px; max-width: 720px; color: #4f5e58; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 32px 0 24px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 22px; border-radius: 999px; border: 1px solid var(--line); font-weight: 800; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn.primary { background: var(--deep); color: #fffaf1; border-color: var(--deep); }
.btn.ghost { background: rgba(255,255,255,.6); color: var(--deep); }
.text-link { color: var(--deep); font-weight: 800; border-bottom: 2px solid rgba(32, 82, 70, .28); }
.domain-card { display: inline-flex; flex-direction: column; gap: 4px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255, 255, 255, .58); box-shadow: 0 12px 32px rgba(22,55,47,.08); }
.domain-card span { color: var(--muted); font-size: 13px; }
.domain-card strong { color: var(--deep); word-break: break-all; }
.hero-art img, .panel-image { border-radius: var(--radius); box-shadow: var(--shadow); background: var(--sand); }
.section { padding: 82px 0; }
.soft-bg { background: var(--sand); }
.muted-section { background: #eef2ea; }
.section-head { max-width: 760px; margin: 0 auto 38px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.category-grid, .value-grid, .recommend-grid, .plan-grid, .feature-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.category-card, .doc-card, .recommend-grid article, .value-grid article, .feature-row article, .plan-grid article, .video-card, .topic-card, .timeline-grid article, .contact-panel, .contact-form, .course-list article {
    background: rgba(255, 250, 241, .86);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 14px 34px rgba(22,55,47,.07);
}
.category-card { padding: 14px; }
.category-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 18px; margin-bottom: 18px; }
.category-card span, .tag, .recommend-grid span, .topic-card span, .timeline-grid span { display: inline-flex; color: var(--deep-2); background: rgba(111, 138, 104, .13); padding: 4px 10px; border-radius: 999px; font-size: 13px; font-weight: 800; margin-bottom: 12px; }
.category-card h3, .category-card p { padding: 0 4px; }
.check-list, .number-list { padding-left: 0; margin: 22px 0 0; list-style: none; }
.check-list li, .number-list li { margin: 12px 0; padding: 14px 16px 14px 44px; background: rgba(255,255,255,.55); border: 1px solid var(--line); border-radius: 16px; position: relative; color: #4d5d57; }
.check-list li::before { content: "✓"; position: absolute; left: 17px; color: var(--deep-2); font-weight: 900; }
.number-list { counter-reset: step; }
.number-list li { padding-left: 58px; }
.number-list li::before { counter-increment: step; content: counter(step, decimal-leading-zero); position: absolute; left: 15px; top: 14px; color: var(--deep-2); font-weight: 900; }
.check-list.large li { font-size: 18px; }
.mini-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 26px; }
.mini-stats div { padding: 20px; border-radius: 18px; background: rgba(255, 250, 241, .72); border: 1px solid var(--line); }
.mini-stats strong { display: block; color: var(--deep); font-size: 28px; }
.mini-stats span { color: var(--muted); }
.feature-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.feature-row article, .recommend-grid article, .plan-grid article, .value-grid article { padding: 28px; }
.path-list { display: grid; gap: 12px; margin-top: 24px; }
.path-list div { display: grid; grid-template-columns: 54px 1fr; align-items: center; gap: 14px; padding: 15px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255, 255, 255, .58); }
.path-list span { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 16px; background: var(--deep); color: var(--paper); font-weight: 900; }
.path-list p { margin: 0; }
.doc-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.doc-grid.expanded { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.doc-card { overflow: hidden; }
.doc-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; background: var(--sand); }
.doc-card div { padding: 22px; }
.doc-card a { color: var(--deep-2); font-weight: 900; }
.knowledge { color: var(--deep); font-weight: 700; }
.recommend-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.faq-list { display: grid; gap: 12px; max-width: 940px; margin: 0 auto; }
details { background: rgba(255, 250, 241, .82); border: 1px solid var(--line); border-radius: 18px; padding: 18px 22px; }
summary { cursor: pointer; color: var(--deep); font-weight: 900; }
details p { margin-top: 12px; margin-bottom: 0; }
.contact-band { background: linear-gradient(135deg, var(--deep), #2b5b4d); color: var(--paper); }
.contact-band h2, .contact-band p, .contact-band .eyebrow { color: var(--paper); }
.band-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.page-hero { padding: 92px 0 72px; background:
    radial-gradient(circle at 80% 0%, rgba(111,138,104,.18), transparent 34%),
    linear-gradient(180deg, #fffaf1, #f4ecdf);
    text-align: center;
}
.page-hero p { font-size: 18px; }
.image-hero { background:
    radial-gradient(circle at 30% 20%, rgba(111,138,104,.22), transparent 30%),
    linear-gradient(180deg, #fffaf1, #edf2ed);
}
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 30px; }
.filter-bar span { padding: 10px 16px; border-radius: 999px; background: var(--mist); color: var(--deep); font-weight: 800; }
.topic-map-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 20px; }
.topic-card { padding: 24px; overflow: hidden; position: relative; min-height: 360px; }
.topic-card:nth-child(1), .topic-card:nth-child(2) { grid-column: span 3; }
.topic-card:nth-child(n+3) { grid-column: span 2; }
.topic-card img { position: absolute; right: 18px; bottom: 16px; width: min(52%, 230px); opacity: .95; border-radius: 18px; }
.topic-card p { max-width: 75%; }
.timeline-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.timeline-grid article { padding: 26px; }
.course-list { display: grid; gap: 14px; margin-top: 22px; }
.course-list article { padding: 20px; }
.course-list strong { display: block; font-size: 20px; color: var(--deep); }
.course-list span { color: var(--leaf); font-weight: 800; }
.video-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.video-card { overflow: hidden; }
.video-thumb { position: relative; }
.video-thumb img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.video-thumb button { position: absolute; inset: 0; margin: auto; width: 64px; height: 64px; border-radius: 999px; border: 0; color: var(--paper); background: rgba(22,55,47,.88); cursor: pointer; box-shadow: var(--shadow); }
.video-card div:last-child { padding: 24px; }
.contact-grid { display: grid; grid-template-columns: .86fr 1.14fr; gap: 28px; align-items: start; }
.contact-panel, .contact-form { padding: 30px; }
.contact-panel strong { display: block; padding: 14px 16px; margin: 8px 0 18px; background: var(--mist); border-radius: 14px; word-break: break-all; color: var(--deep); }
.muted { font-size: 14px; }
.contact-form { display: grid; gap: 16px; }
.contact-form label { display: grid; gap: 8px; color: var(--deep); font-weight: 800; }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; border: 1px solid var(--line); background: rgba(255,255,255,.72); border-radius: 14px; padding: 12px 14px; color: var(--ink); outline: none; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { border-color: var(--leaf); box-shadow: 0 0 0 4px rgba(111,138,104,.16); }
.form-note { min-height: 24px; color: var(--deep-2); font-weight: 800; margin: 0; }
.site-footer { background: #162a25; color: rgba(255,250,241,.86); padding: 56px 0 22px; }
.site-footer p, .site-footer a { color: rgba(255,250,241,.74); }
.footer-grid { display: grid; grid-template-columns: 1.5fr .8fr 1fr; gap: 32px; }
.footer-brand { font-size: 24px; font-weight: 900; margin-bottom: 12px; color: var(--paper); }
.site-footer h3 { color: var(--paper); font-size: 18px; }
.site-footer a { display: block; margin: 8px 0; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-top: 26px; margin-top: 26px; border-top: 1px solid rgba(255,255,255,.12); color: rgba(255,250,241,.7); }
@media (max-width: 980px) {
    .nav-toggle { display: block; }
    .main-nav { position: absolute; top: 76px; left: 20px; right: 20px; display: none; flex-direction: column; align-items: stretch; padding: 14px; background: var(--paper); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
    .main-nav.open { display: flex; }
    .main-nav a { padding: 12px 14px; }
    .hero-grid, .split-grid, .split-grid.reverse, .contact-grid { grid-template-columns: 1fr; }
    .category-grid, .value-grid, .timeline-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .doc-grid, .doc-grid.expanded, .video-grid, .feature-row, .recommend-grid, .plan-grid { grid-template-columns: 1fr; }
    .topic-map-grid { grid-template-columns: 1fr; }
    .topic-card:nth-child(n) { grid-column: auto; }
    .topic-card p { max-width: 100%; }
    .topic-card img { position: static; width: 100%; margin-top: 18px; }
    .band-inner { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 640px) {
    .container, .narrow { width: min(100% - 28px, var(--max)); }
    .nav-wrap { height: 68px; }
    .main-nav { top: 68px; left: 14px; right: 14px; }
    .hero, .section, .page-hero { padding: 54px 0; }
    .category-grid, .value-grid, .timeline-grid, .mini-stats { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
    .domain-card { width: 100%; }
    .brand-text { font-size: 18px; }
}