:root{
    --ink:#1c2521;
    --deep:#173d34;
    --deep-2:#0f2c26;
    --leaf:#2f6b55;
    --sage:#6f8f7c;
    --sand:#f6f0e2;
    --paper:#fffaf0;
    --mist:#e7ecdf;
    --line:rgba(28,37,33,.12);
    --shadow:0 24px 80px rgba(15,44,38,.12);
    --radius:26px;
}
*{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:linear-gradient(180deg,var(--paper) 0%,var(--sand) 46%,#edf3ea 100%);
    line-height:1.72;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.site-header{
    position:sticky;
    top:0;
    z-index:30;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:24px;
    padding:16px clamp(18px,4vw,56px);
    background:rgba(255,250,240,.86);
    border-bottom:1px solid var(--line);
    backdrop-filter:blur(18px);
}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.04em;color:var(--deep-2)}
.brand img{filter:drop-shadow(0 8px 16px rgba(23,61,52,.14))}
.site-nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.site-nav a{padding:9px 14px;border-radius:999px;color:#405148;font-size:15px}
.site-nav a:hover,.site-nav a.active{background:var(--deep);color:#fff}
.nav-toggle{display:none;background:var(--deep);border:0;border-radius:16px;padding:10px;width:46px;height:42px}
.nav-toggle span{display:block;height:2px;background:#fff;margin:5px 0;border-radius:2px}
main{overflow:hidden}
.hero{
    padding:clamp(60px,9vw,118px) clamp(18px,4vw,58px) 52px;
    display:grid;
    grid-template-columns:minmax(0,1.02fr) minmax(320px,.98fr);
    gap:44px;
    align-items:center;
}
.hero-copy h1,.sub-copy h1{font-size:clamp(38px,6vw,78px);line-height:1.04;margin:14px 0 22px;letter-spacing:-.04em;color:var(--deep-2)}
.hero-copy p,.sub-copy p{font-size:clamp(17px,2vw,21px);color:#475b50;max-width:760px;margin:0 0 24px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0;color:var(--leaf);font-weight:700;letter-spacing:.08em;font-size:14px}
.eyebrow:before{content:"";width:34px;height:1px;background:var(--leaf)}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin:28px 0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 18px;border-radius:999px;background:var(--deep);color:#fff;font-weight:700;box-shadow:0 12px 30px rgba(23,61,52,.16)}
.btn.secondary{background:rgba(23,61,52,.08);color:var(--deep);box-shadow:none;border:1px solid rgba(23,61,52,.12)}
.hero-meta{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:34px;max-width:760px}
.hero-meta div,.note-box,.mini-card{background:rgba(255,255,255,.66);border:1px solid var(--line);border-radius:22px;padding:16px;box-shadow:0 14px 40px rgba(15,44,38,.06)}
.hero-meta strong{display:block;color:var(--deep-2);font-size:22px;margin-bottom:4px}
.hero-media{position:relative;border-radius:36px;overflow:hidden;background:#e8ede0;box-shadow:var(--shadow)}
.hero-media:after{content:"";position:absolute;inset:auto 18px 18px 18px;height:80px;border-radius:28px;background:linear-gradient(180deg,rgba(255,250,240,.04),rgba(255,250,240,.86));pointer-events:none}
.hero-media img{width:100%}
.section{padding:62px clamp(18px,4vw,58px)}
.section.alt{background:rgba(255,255,255,.42)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:28px}
.section-head h2{font-size:clamp(28px,4vw,48px);line-height:1.1;margin:0;color:var(--deep-2);letter-spacing:-.03em}
.section-head p{margin:0;color:#5f7068;max-width:620px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{background:rgba(255,250,240,.82);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 18px 56px rgba(15,44,38,.07);transition:transform .24s ease,box-shadow .24s ease}
.card:hover{transform:translateY(-4px);box-shadow:0 24px 70px rgba(15,44,38,.12)}
.card img{border-radius:20px;margin-bottom:16px;background:#e4ebdf;width:100%}
.card h3{font-size:22px;margin:10px 0;color:var(--deep-2);line-height:1.25}
.card p{color:#54665d;margin:0 0 12px}
.card .meta{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.pill,.tag-row span{display:inline-flex;align-items:center;border-radius:999px;background:rgba(47,107,85,.11);color:var(--deep);padding:6px 10px;font-size:13px;font-weight:700}
.tag-row{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0 0}
.feature{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;background:linear-gradient(135deg,rgba(23,61,52,.95),rgba(47,107,85,.9));color:#fff;border-radius:36px;padding:clamp(24px,4vw,44px);box-shadow:var(--shadow)}
.feature h2{font-size:clamp(28px,4vw,48px);line-height:1.12;margin:0 0 16px}
.feature p{color:rgba(255,255,255,.82);margin:0 0 16px}
.feature .btn{background:#fff;color:var(--deep)}
.feature img{border-radius:28px;background:rgba(255,255,255,.12)}
.path{position:relative;display:grid;gap:18px;margin-top:24px}
.path:before{content:"";position:absolute;left:26px;top:22px;bottom:22px;width:2px;background:rgba(47,107,85,.28)}
.path-item{display:grid;grid-template-columns:54px 1fr;gap:16px;position:relative}
.path-num{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;background:var(--deep);color:#fff;font-weight:800;box-shadow:0 10px 24px rgba(23,61,52,.18)}
.path-body{background:rgba(255,250,240,.8);border:1px solid var(--line);border-radius:22px;padding:18px}
.path-body h3{margin:0 0 6px;color:var(--deep-2)}
.path-body p{margin:0;color:#596b62}
.sub-hero{padding:54px clamp(18px,4vw,58px);display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,460px);gap:36px;align-items:center;background:radial-gradient(circle at 85% 12%,rgba(47,107,85,.16),transparent 36%)}
.sub-hero img{border-radius:32px;box-shadow:var(--shadow);background:#e7ecdf}
.topic-map{display:grid;grid-template-columns:1fr 1fr 1fr;gap:18px}
.topic-node{position:relative;background:rgba(255,255,255,.72);border:1px solid var(--line);border-radius:24px;padding:22px;min-height:170px}
.topic-node:before{content:"";position:absolute;width:11px;height:11px;border-radius:50%;background:var(--leaf);top:22px;right:22px;box-shadow:0 0 0 8px rgba(47,107,85,.1)}
.video-shell{background:#11241f;border-radius:28px;padding:16px;color:#fff;box-shadow:var(--shadow)}
.video-screen{aspect-ratio:16/9;border-radius:20px;background:linear-gradient(135deg,#345b4d,#d7c49e);display:grid;place-items:center;position:relative;overflow:hidden}
.play{width:68px;height:68px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.88);color:var(--deep);font-weight:900}
.video-shell h3{margin:16px 0 8px}.video-shell p{color:rgba(255,255,255,.76);margin:0}
.faq{display:grid;gap:14px}
details{background:rgba(255,250,240,.86);border:1px solid var(--line);border-radius:20px;padding:18px 20px}
summary{cursor:pointer;font-weight:800;color:var(--deep-2)}
details p{margin:12px 0 0;color:#58685f}
.form{background:rgba(255,250,240,.9);border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:var(--shadow)}
.form label{display:block;font-weight:800;color:var(--deep-2);margin:14px 0 6px}
.form input,.form textarea,.form select{width:100%;border:1px solid rgba(28,37,33,.14);border-radius:16px;padding:13px 14px;background:#fffdf8;color:var(--ink);font:inherit}
.form textarea{min-height:140px;resize:vertical}.form-status{margin-top:14px;color:var(--leaf);font-weight:700}
.site-footer{padding:42px clamp(18px,4vw,58px);background:#102a24;color:#f9f2e6}
.footer-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:26px;border-bottom:1px solid rgba(255,255,255,.14);padding-bottom:28px}
.site-footer p,.site-footer a{color:rgba(249,242,230,.76)}.site-footer strong{display:block;margin-bottom:8px}.muted{opacity:.72}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:22px;color:rgba(249,242,230,.78)}
@media (max-width:980px){
    .hero,.sub-hero,.feature{grid-template-columns:1fr}.grid,.grid.two,.grid.four,.topic-map{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-meta{grid-template-columns:1fr}
}
@media (max-width:720px){
    .site-header{align-items:flex-start}.nav-toggle{display:block}.site-nav{display:none;position:absolute;left:18px;right:18px;top:76px;background:rgba(255,250,240,.98);border:1px solid var(--line);border-radius:22px;padding:12px;box-shadow:var(--shadow)}
    .site-nav.open{display:grid}.site-nav a{padding:12px 14px}.hero{padding-top:42px}.grid,.grid.two,.grid.four,.topic-map,.footer-grid{grid-template-columns:1fr}.section-head{display:block}.section-head p{margin-top:12px}.feature{border-radius:26px}.hero-copy h1,.sub-copy h1{font-size:38px}.section{padding-top:46px;padding-bottom:46px}
}