:root{
  --bg:#f8f8f6;--card:#ffffff;--ink:#111827;--muted:#687082;--line:#e6e2dc;--soft:#f1efe9;--accent:#1f2937;--accent-2:#9a7b52;--good:#2d6a4f;
  --shadow:0 24px 70px rgba(17,24,39,.08);--radius:28px;--max:1180px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.7;letter-spacing:.01em}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container{width:min(var(--max),calc(100% - 40px));margin:0 auto}.skip{position:absolute;left:-999px;top:auto}.skip:focus{left:16px;top:16px;background:#fff;padding:10px 14px;border-radius:12px;z-index:50}.site-header{position:sticky;top:0;z-index:20;background:rgba(248,248,246,.86);backdrop-filter:blur(18px);border-bottom:1px solid rgba(230,226,220,.75)}.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:18px 0}.logo{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.03em}.logo img{width:142px;height:auto}.nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.nav a{font-size:14px;color:#343946;padding:9px 13px;border:1px solid transparent;border-radius:999px}.nav a:hover,.nav a[aria-current="page"]{background:#fff;border-color:var(--line);box-shadow:0 10px 30px rgba(17,24,39,.05)}.search-shell{padding:0 0 18px}.search-box{display:grid;grid-template-columns:1fr auto;gap:10px;max-width:740px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 8px 8px 20px;box-shadow:0 16px 50px rgba(17,24,39,.05)}.search-box input{border:0;outline:0;background:transparent;font-size:15px;color:var(--ink);min-width:0}.btn,.search-box button{border:0;background:var(--ink);color:#fff;border-radius:999px;padding:12px 20px;font-weight:700;cursor:pointer;transition:.25s ease}.btn:hover,.search-box button:hover{transform:translateY(-1px);box-shadow:0 15px 35px rgba(17,24,39,.18)}.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}.search-result{max-width:740px;margin:10px auto 0;color:var(--muted);font-size:14px}.hero{padding:72px 0 42px}.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(320px,.95fr);gap:48px;align-items:center}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#445;letter-spacing:.12em;font-size:13px;text-transform:uppercase;background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 12px}.eyebrow::before{content:"";width:8px;height:8px;border-radius:999px;background:var(--good)}h1{font-size:clamp(40px,6vw,76px);line-height:1.05;letter-spacing:-.055em;margin:20px 0 22px}.lead{font-size:clamp(17px,2vw,21px);color:var(--muted);max-width:760px}.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}.hero-card{position:relative;border-radius:38px;overflow:hidden;box-shadow:var(--shadow);background:#fff}.hero-card img{aspect-ratio:1.18/1;object-fit:cover}.glass-panel{position:absolute;left:22px;right:22px;bottom:22px;padding:18px;border:1px solid rgba(255,255,255,.6);background:rgba(255,255,255,.78);backdrop-filter:blur(16px);border-radius:24px}.stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}.stat{background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:0 20px 50px rgba(17,24,39,.04)}.stat strong{display:block;font-size:28px;letter-spacing:-.04em}.stat span{color:var(--muted);font-size:13px}.section{padding:72px 0}.section-head{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:28px}.section h2{font-size:clamp(28px,4vw,46px);line-height:1.12;letter-spacing:-.04em;margin:0}.section p.sub{color:var(--muted);max-width:640px;margin:12px 0 0}.grid{display:grid;gap:18px}.grid.three{grid-template-columns:repeat(3,1fr)}.grid.two{grid-template-columns:repeat(2,1fr)}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 20px 55px rgba(17,24,39,.045);transition:.25s ease}.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.board-card{min-height:218px;display:flex;flex-direction:column;justify-content:space-between}.board-card h3,.topic-card h3{font-size:21px;line-height:1.35;margin:0 0 10px}.meta{display:flex;flex-wrap:wrap;gap:9px;color:var(--muted);font-size:13px}.pill{display:inline-flex;border:1px solid var(--line);background:var(--soft);padding:4px 10px;border-radius:999px;color:#4d5564}.video-card{position:relative;overflow:hidden;border-radius:28px;background:#101827;border:1px solid var(--line);box-shadow:var(--shadow)}.video-card video,.video-card img{width:100%;aspect-ratio:16/10;object-fit:cover;opacity:.92}.play-button{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(.9);width:72px;height:72px;border-radius:999px;border:1px solid rgba(255,255,255,.7);background:rgba(255,255,255,.82);display:grid;place-items:center;color:#111827;opacity:0;transition:.25s ease}.video-card:hover .play-button{opacity:1;transform:translate(-50%,-50%) scale(1)}.play-button::before{content:"";border-left:18px solid currentColor;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}.video-copy{position:absolute;left:18px;right:18px;bottom:18px;padding:16px;border-radius:22px;background:rgba(255,255,255,.84);backdrop-filter:blur(14px)}.video-copy h3{margin:0 0 6px;font-size:18px}.topic-list{display:grid;gap:14px}.topic-card{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center}.topic-numbers{text-align:right;color:var(--muted);font-size:13px;min-width:150px}.topic-numbers strong{display:block;color:var(--ink);font-size:20px}.figure{margin:0}.figure figcaption{font-size:13px;color:var(--muted);margin-top:12px}.faq details{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px 22px}.faq details+details{margin-top:12px}.faq summary{cursor:pointer;font-weight:800}.faq p{color:var(--muted);margin:12px 0 0}.review{display:flex;gap:16px}.avatar{width:46px;height:46px;border-radius:999px;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:800;flex:0 0 auto}.form{display:grid;gap:12px}.form input,.form textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:18px;padding:14px 16px;font:inherit;outline:0}.form textarea{min-height:118px;resize:vertical}.breadcrumb{margin:26px 0;color:var(--muted);font-size:14px}.page-title{padding:48px 0 22px}.page-title h1{font-size:clamp(36px,5vw,58px)}.content-prose{background:#fff;border:1px solid var(--line);border-radius:32px;padding:32px;box-shadow:var(--shadow)}.content-prose h2{font-size:30px}.content-prose li+li{margin-top:8px}.site-footer{margin-top:70px;background:#111827;color:#f8fafc}.footer-grid{display:grid;grid-template-columns:1.3fr .7fr .7fr;gap:28px;padding:54px 0}.site-footer a{color:#dbe2ef}.site-footer p,.site-footer li{color:#b8c0ce}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;color:#cbd5e1;font-size:14px}.footer-logo img{width:150px}.share-row{display:flex;gap:10px;flex-wrap:wrap}.share-row button{border:1px solid rgba(17,24,39,.12);background:#fff;border-radius:999px;padding:10px 14px;cursor:pointer}.share-row button:hover{transform:translateY(-1px)}.note{font-size:13px;color:var(--muted)}@media (max-width:900px){.hero-grid,.grid.three,.grid.two,.footer-grid{grid-template-columns:1fr}.section-head{display:block}.nav-wrap{align-items:flex-start;flex-direction:column}.nav{width:100%;overflow:auto;flex-wrap:nowrap;padding-bottom:4px}.topic-card{grid-template-columns:1fr}.topic-numbers{text-align:left}.stats-row{grid-template-columns:1fr 1fr}.hero{padding-top:42px}}@media (max-width:560px){.container{width:min(100% - 26px,var(--max))}.search-box{border-radius:24px;grid-template-columns:1fr}.search-box button{width:100%}.stats-row{grid-template-columns:1fr}h1{letter-spacing:-.04em}.card{padding:22px}.footer-grid{padding:40px 0}.hero-card{border-radius:28px}.glass-panel{position:static;border-radius:0;background:#fff}.section{padding:52px 0}}