:root{
  --bg:#f7f5ef; --paper:#fffef9; --ink:#202724; --muted:#6d756e; --line:#e5e0d5; --soft:#ece7dc; --accent:#86a58f; --accent-dark:#3e5f50; --radius:28px; --shadow:0 26px 80px rgba(32,39,36,.08);
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.72;text-rendering:optimizeLegibility} a{color:inherit;text-decoration:none} img{max-width:100%;height:auto;display:block} button,input,textarea{font:inherit}.skip-link{position:absolute;left:-999px;top:0;background:var(--ink);color:white;padding:10px 16px;border-radius:0 0 12px 0;z-index:50}.skip-link:focus{left:0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
.site-header{position:sticky;top:0;z-index:20;background:rgba(247,245,239,.86);backdrop-filter:saturate(160%) blur(18px);border-bottom:1px solid rgba(229,224,213,.75)}.nav-wrap{max-width:1180px;margin:auto;padding:18px 24px 12px;display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center}.main-nav{margin-left:auto;display:flex;align-items:center;gap:8px}.main-nav a,.footer-links a{padding:10px 14px;border-radius:999px;color:var(--muted);font-weight:600;font-size:15px}.main-nav a:hover,.main-nav a.active,.footer-links a:hover{background:var(--paper);color:var(--ink);box-shadow:0 10px 30px rgba(32,39,36,.06)}.menu-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:var(--paper);border-radius:16px;padding:8px 12px}.search-shell{max-width:1180px;margin:0 auto 16px;padding:0 24px;display:grid;grid-template-columns:1fr auto;gap:10px}.search-shell input{border:1px solid var(--line);border-radius:18px;background:rgba(255,254,249,.92);padding:14px 16px;outline:none}.search-shell input:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(134,165,143,.16)}.search-shell button,.btn{border:0;border-radius:18px;padding:13px 20px;background:var(--ink);color:#fff;font-weight:700;cursor:pointer}.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}#mock-search-result{grid-column:1/-1;margin:0;color:var(--muted);font-size:14px;min-height:22px}.container{max-width:1180px;margin:auto;padding:0 24px}.hero{position:relative;overflow:hidden;margin:42px auto 24px;border-radius:42px;background:linear-gradient(135deg,#fffef9,#ece7dc 58%,#dfe8e0);box-shadow:var(--shadow)}.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;padding:72px clamp(28px,6vw,76px)}.eyebrow{display:inline-flex;gap:8px;align-items:center;margin:0 0 18px;color:var(--accent-dark);font-weight:800;letter-spacing:.08em}.eyebrow:before{content:"";width:34px;height:1px;background:var(--accent-dark)}h1,h2,h3{line-height:1.18;margin:0;color:var(--ink)}h1{font-size:clamp(38px,6vw,70px);letter-spacing:-.04em}h2{font-size:clamp(28px,4vw,46px);letter-spacing:-.03em}h3{font-size:22px}.lead{font-size:18px;color:var(--muted);max-width:680px}.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}.hero-card{background:rgba(255,254,249,.72);border:1px solid rgba(229,224,213,.82);border-radius:34px;padding:18px;transform:rotate(1deg)}.hero-card figure{margin:0}.hero-card figcaption,.image-desc{color:var(--muted);font-size:13px;margin-top:12px}.section{padding:78px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:28px}.section-head p{margin:10px 0 0;color:var(--muted);max-width:650px}.kicker{color:var(--accent-dark);font-weight:800;font-size:14px;letter-spacing:.08em}.intro-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.text-card,.board-card,.topic-card,.review-card,.faq-card,.contact-card,.stat-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 18px 48px rgba(32,39,36,.045)}.text-card p,.board-card p,.topic-card p,.review-card p,.faq-card p{color:var(--muted);margin-bottom:0}.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.video-card{position:relative;overflow:hidden;border-radius:30px;background:var(--paper);border:1px solid var(--line);box-shadow:0 18px 52px rgba(32,39,36,.055);transition:transform .25s ease,box-shadow .25s ease}.video-card:hover{transform:translateY(-6px);box-shadow:0 28px 70px rgba(32,39,36,.12)}.video-frame{position:relative;aspect-ratio:16/10;background:#e7e2d8;overflow:hidden}.video-frame video,.video-frame img{width:100%;height:100%;object-fit:cover}.play-dot{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(.92);width:62px;height:62px;border-radius:50%;background:rgba(32,39,36,.86);opacity:0;display:grid;place-items:center;transition:.24s ease}.play-dot:after{content:"";border-left:16px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px}.video-card:hover .play-dot{opacity:1;transform:translate(-50%,-50%) scale(1)}.video-body{padding:20px}.video-body h3{font-size:20px}.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.tag{font-size:12px;padding:5px 9px;border-radius:999px;background:#edf2ed;color:var(--accent-dark);font-weight:700}.metrics{display:flex;gap:14px;flex-wrap:wrap;margin-top:15px;color:var(--muted);font-size:13px}.board-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.board-icon{width:44px;height:44px;border-radius:16px;background:linear-gradient(135deg,#dfe8e0,#f0eadf);display:grid;place-items:center;margin-bottom:18px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.stat-card strong{display:block;font-size:34px;line-height:1;color:var(--ink)}.stat-card span{color:var(--muted);font-size:14px}.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.review-card blockquote{margin:0;color:var(--muted)}.review-card cite{display:block;margin-top:16px;font-style:normal;font-weight:800;color:var(--ink)}.faq-list{display:grid;gap:12px}.faq-list details{background:var(--paper);border:1px solid var(--line);border-radius:22px;padding:18px 22px}.faq-list summary{cursor:pointer;font-weight:800}.faq-list p{color:var(--muted);margin:12px 0 0}.contact-shell{display:grid;grid-template-columns:1fr .9fr;gap:18px}.contact-card input,.contact-card textarea{width:100%;border:1px solid var(--line);border-radius:16px;padding:13px 14px;background:#fffef9;margin-bottom:12px}.site-footer{border-top:1px solid var(--line);padding:46px 24px 32px;background:#f2eee5}.footer-inner{max-width:1180px;margin:auto;display:flex;align-items:flex-start;justify-content:space-between;gap:30px}.footer-logo{display:inline-flex;margin-bottom:14px}.site-footer p{color:var(--muted);max-width:620px}.footer-links{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}.copyright{text-align:center;margin:30px auto 0;font-size:14px}.page-hero{padding:64px 0 28px}.breadcrumb{color:var(--muted);font-size:14px;margin-bottom:16px}.list-stack{display:grid;gap:16px}.rank-table{width:100%;border-collapse:collapse;background:var(--paper);border-radius:28px;overflow:hidden;border:1px solid var(--line)}.rank-table th,.rank-table td{text-align:left;padding:18px;border-bottom:1px solid var(--line)}.rank-table tr:last-child td{border-bottom:0}.notice{padding:18px 20px;border:1px solid var(--line);border-radius:22px;background:#fffef9;color:var(--muted)}
@media (max-width:900px){.hero-inner,.contact-shell{grid-template-columns:1fr}.video-grid,.intro-grid,.reviews{grid-template-columns:1fr 1fr}.board-grid,.stats{grid-template-columns:1fr 1fr}.main-nav{display:none;position:absolute;left:24px;right:24px;top:76px;background:var(--paper);border:1px solid var(--line);border-radius:22px;padding:12px;box-shadow:var(--shadow)}.main-nav.open{display:grid}.menu-toggle{display:block}.section{padding:54px 0}.footer-inner{display:block}.footer-links{justify-content:flex-start;margin-top:20px}}
@media (max-width:620px){.nav-wrap{padding:14px 16px}.search-shell{padding:0 16px;grid-template-columns:1fr}.container{padding:0 16px}.hero{margin-top:24px;border-radius:30px}.hero-inner{padding:46px 22px}.video-grid,.intro-grid,.reviews,.board-grid,.stats{grid-template-columns:1fr}.section-head{display:block}.search-shell button{width:100%}.rank-table{font-size:14px}.rank-table th:nth-child(3),.rank-table td:nth-child(3){display:none}}