:root{--paper:#f5f1e6;--surface:#fcfaf1;--ink:#153f38;--jade:#397764;--muted:#6b7b64;--gold:#c9a354;--line:#c7d0b9;font-family:"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;background:var(--paper);color:var(--ink)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);line-height:1.75}a{color:var(--jade);text-underline-offset:4px}a:hover{color:var(--ink)}a:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.skip{position:absolute;left:-9999px;top:8px;z-index:20;padding:10px 16px;background:var(--ink);color:#fff}.skip:focus{left:8px}
.site-header{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;min-height:72px;padding:10px clamp(18px,5vw,72px);border-bottom:1px solid var(--line);background:rgba(245,241,230,.96);backdrop-filter:blur(12px)}.brand{display:inline-flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-weight:700;letter-spacing:.08em}.brand img{width:42px;height:42px}.brand small{display:block;color:var(--muted);font-size:11px;font-weight:500;letter-spacing:.16em;line-height:1.2}.site-nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap;justify-content:flex-end}.site-nav a{min-height:44px;display:inline-flex;align-items:center;padding:8px 11px;color:var(--ink);text-decoration:none;border-bottom:2px solid transparent}.site-nav a:hover,.site-nav a[aria-current=page]{border-bottom-color:var(--gold)}
.filing-banner{margin:0;padding:11px 18px;text-align:center;background:var(--ink);color:var(--surface);font-size:14px;letter-spacing:.03em}.filing-banner strong{color:#f1d58e}.wrap{width:min(1120px,calc(100% - 36px));margin:0 auto}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(30px,6vw,78px);align-items:center;min-height:590px;padding:78px 0 64px}.eyebrow{margin:0 0 16px;color:var(--jade);font-weight:700;letter-spacing:.18em;font-size:13px;text-transform:uppercase}h1,h2,h3{font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-weight:500;line-height:1.28}h1{max-width:760px;margin:0;font-size:clamp(44px,7vw,82px);letter-spacing:-.03em}.lead{max-width:720px;margin:24px 0 0;color:#3d5149;font-size:clamp(17px,2vw,21px)}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}.button{min-height:48px;display:inline-flex;align-items:center;justify-content:center;padding:11px 22px;border:1px solid var(--ink);border-radius:4px;background:var(--ink);color:var(--surface);text-decoration:none;font-weight:700}.button.secondary{background:transparent;color:var(--ink)}.button:hover{background:var(--jade);color:#fff;border-color:var(--jade)}
.hero-mark{position:relative;min-height:380px;border:1px solid var(--line);background:var(--surface);overflow:hidden}.hero-mark:before{content:"";position:absolute;inset:20px;display:grid;place-items:center;color:var(--ink);font-family:"Songti SC",SimSun,serif;font-size:clamp(150px,22vw,260px);line-height:1}.hero-mark:after{content:"学习不是收藏答案，而是形成理解。";position:absolute;left:24px;right:24px;bottom:22px;padding-top:16px;border-top:1px solid var(--gold);color:var(--muted);font-size:13px;letter-spacing:.08em}.gold-corner{position:absolute;right:0;top:0;width:82px;height:82px;background:linear-gradient(135deg,transparent 49%,var(--gold) 50%)}
.section{padding:78px 0;border-top:1px solid var(--line)}.section-head{display:grid;grid-template-columns:.7fr 1.3fr;gap:30px;margin-bottom:34px}.section h2{margin:0;font-size:clamp(30px,4vw,48px)}.section-intro{max-width:700px;margin:3px 0 0;color:var(--muted);font-size:18px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{min-height:245px;padding:26px;border:1px solid var(--line);border-radius:5px;background:var(--surface)}.card .number{color:var(--gold);font-family:Georgia,serif;font-size:15px}.card h3{margin:36px 0 12px;font-size:24px}.card p{margin:0;color:var(--muted)}.principles{display:grid;grid-template-columns:1fr 1fr;gap:16px}.principle{padding:25px 0;border-top:1px solid var(--line)}.principle h3{margin:0 0 8px;font-size:21px}.principle p{margin:0;color:var(--muted)}.status-panel{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding:34px;border-left:5px solid var(--gold);background:var(--ink);color:var(--surface)}.status-panel h2{color:var(--surface)}.status-panel p{margin:0;color:#dce2d5}.status-list{margin:12px 0 0;padding-left:1.3em}
.legal-main{width:min(920px,calc(100% - 36px));margin:0 auto;padding:58px 0 88px}.legal-main h1{font-size:clamp(40px,6vw,66px)}.legal-main h2{margin:54px 0 14px;padding-top:8px;border-top:1px solid var(--line);font-size:28px}.legal-main p,.legal-main li{color:#334a42}.meta{color:var(--muted)!important;font-size:14px}.notice{margin:22px 0;padding:18px 20px;border-left:4px solid var(--gold);background:var(--surface);color:#334a42}.legal-main table{width:100%;border-collapse:collapse;margin:20px 0;background:var(--surface)}.legal-main th,.legal-main td{padding:14px;border:1px solid var(--line);text-align:left;vertical-align:top}.legal-main th{background:#e8e8d9}.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:28px}.contact-card{padding:24px;border:1px solid var(--line);background:var(--surface)}.contact-card h2{margin-top:0;border-top:0}
.site-footer{padding:38px clamp(18px,5vw,72px);border-top:1px solid var(--line);background:#ece9dd}.footer-grid{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:end}.footer-links{display:flex;flex-wrap:wrap;gap:8px 22px}.footer-links a{min-height:44px;display:inline-flex;align-items:center;color:var(--ink)}.footer-meta{margin:12px 0 0;color:var(--muted);font-size:13px}.filing-line{text-align:right;color:var(--muted);font-size:13px}
@media(max-width:800px){.site-header{position:static;align-items:flex-start;flex-direction:column}.site-nav{width:100%;justify-content:flex-start;overflow-x:auto;flex-wrap:nowrap}.site-nav a{white-space:nowrap}.hero{grid-template-columns:1fr;min-height:auto;padding-top:58px}.hero-mark{min-height:320px}.section-head,.status-panel,.footer-grid{grid-template-columns:1fr}.cards{grid-template-columns:1fr}.principles,.contact-grid{grid-template-columns:1fr}.filing-line{text-align:left}}@media(max-width:520px){.wrap,.legal-main{width:min(100% - 28px,1120px)}h1{font-size:43px}.hero{padding-top:42px}.section{padding:58px 0}.legal-main table{display:block;overflow-x:auto}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.official-tree-logo{display:block;width:min(80%,300px);height:290px;object-fit:contain;margin:14px auto 68px;}