:root{--bg:#F5EDCB;--surface:#FFF9E9;--soft:#E9DDA2;--ink:#14120B;--text:#2C2818;--muted:#625B34;--yellow:#F2C62B;--line:rgba(20,18,11,.14);--shadow:0 18px 42px rgba(20,18,11,.10);--max:1100px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;overflow-x:hidden}body.is-locked{overflow:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}img{display:block;max-width:100%}.site-header{position:fixed;inset:0 0 auto;z-index:70}.microbar{height:22px;background:var(--ink);color:var(--yellow);font-size:12px}.microbar-inner,.mainbar-inner{width:min(calc(100% - 32px),var(--max));height:100%;margin:auto;display:flex;align-items:center;justify-content:space-between}.plain-button{border:0;background:transparent;color:var(--yellow);padding:0 4px}.mainbar{height:62px;background:rgba(255,249,233,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.mainbar-inner{gap:20px}.brand{display:flex;align-items:center;min-height:44px}.brand-logo{height:26px;width:auto;max-width:170px;object-fit:contain;object-position:left center}.desktop-focus{display:flex;gap:8px;margin-left:auto}.desktop-focus a{height:38px;padding:0 14px;border-radius:12px;display:flex;align-items:center;border:1px solid transparent;font-weight:700}.desktop-focus a:hover,.desktop-focus a:focus-visible{border-color:var(--ink)}.desktop-focus a.is-active{background:var(--ink);color:var(--yellow)}.menu-button,.panel-close{height:42px;border-radius:12px;border:1px solid var(--ink);background:var(--surface);color:var(--ink);padding:0 14px;font-weight:800}.site-main{padding-top:84px;min-height:70vh}.wrap{width:min(calc(100% - 32px),var(--max));margin:auto}.hero{padding:48px 0 24px}.hero-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(280px,.75fr);gap:28px;align-items:end}.hero h1,.page-hero h1{font-size:clamp(28px,5vw,46px);line-height:1.15;margin:0;color:var(--ink);letter-spacing:-.03em}.hero .lead,.page-hero .lead{color:var(--muted);font-size:16px;max-width:760px}.hero-label,.eyebrow{display:inline-flex;padding:5px 9px;border-radius:999px;background:var(--yellow);color:var(--ink);font-size:12px;font-weight:900;margin-bottom:10px}.hero-side{padding:20px;border:1px solid var(--ink);border-radius:18px;background:var(--surface)}.hero-side strong{font-size:18px}.hero-side p{margin-bottom:0;color:var(--muted)}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.btn{height:44px;padding:0 16px;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;font-weight:800;white-space:nowrap}.btn-primary{background:var(--ink);color:var(--yellow)}.btn-secondary{border:1px solid var(--ink);background:var(--surface);color:var(--ink)}.btn:hover,.btn:focus-visible{outline:3px solid rgba(242,198,43,.55);outline-offset:2px}.section{padding:26px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px}.section-head h2{font-size:24px;margin:0;color:var(--ink)}.section-head p{margin:0;max-width:610px;color:var(--muted)}.media-slot{border:1px solid var(--line);background:var(--surface);border-radius:16px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot img{width:100%;height:100%;object-fit:contain;object-position:center}.media-slot.empty:after{content:"HUANGGUO AI";font-weight:900;color:rgba(20,18,11,.24);letter-spacing:.08em}.slot-160{height:160px}.slot-200{height:200px}.slot-240{height:240px}.slot-320{height:320px}.feature-rail{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}.feature-rail article{padding:20px;border-radius:18px;border:1px solid var(--line);background:var(--surface)}.feature-rail article:first-child{background:var(--ink);color:var(--bg)}.feature-rail article:first-child h2,.feature-rail article:first-child h3{color:var(--yellow)}.feature-rail h2,.feature-rail h3{margin-top:0;color:var(--ink)}.feature-rail p{margin-bottom:0}.step-band{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.step-band article{min-height:180px;padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:16px}.step-no{display:block;font-size:30px;font-weight:900;color:var(--yellow);text-shadow:0 0 0 var(--ink);-webkit-text-stroke:1px var(--ink)}.step-band h3{margin:8px 0}.mosaic{display:grid;grid-template-columns:2fr 1fr 1fr;gap:12px}.mosaic article{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:16px}.mosaic article:first-child{grid-row:span 2}.mosaic h3{margin-top:0}.timeline{display:grid;gap:10px}.timeline article{display:grid;grid-template-columns:140px 1fr;gap:16px;align-items:start;padding:16px 0;border-bottom:1px solid var(--line)}.timeline strong{padding:7px 10px;border-radius:999px;background:var(--ink);color:var(--yellow);text-align:center}.center-app{text-align:center}.center-app .media-slot{width:min(360px,100%);margin:14px auto}.app-icon{width:48px;height:48px;margin:0 auto 12px;border-radius:12px;object-fit:contain}.center-app p{max-width:760px;margin:0 auto 14px;text-align:left}.note-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.note-grid article{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:16px}.note-grid h3{margin-top:0}.page-hero{padding:38px 0 16px}.page-hero h1{font-size:32px}.prose{max-width:820px;margin:auto}.prose h2{font-size:22px;margin:30px 0 8px;color:var(--ink)}.prose h3{font-size:17px;margin:20px 0 6px;color:var(--ink)}.prose p{margin:0 0 14px}.callout{padding:18px 20px;background:var(--ink);color:var(--bg);border-radius:16px;margin:20px 0}.callout strong{color:var(--yellow)}.cards-2,.cards-3{display:grid;gap:14px}.cards-2{grid-template-columns:repeat(2,1fr)}.cards-3{grid-template-columns:repeat(3,1fr)}.card{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:16px}.card h2,.card h3{margin-top:0}.strip-list{display:grid;gap:10px}.strip-list article{display:grid;grid-template-columns:150px 1fr;gap:16px;padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:14px}.strip-list strong{color:var(--ink)}.faq-list{display:grid;gap:12px}.faq-list article{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:16px}.faq-list h2{font-size:18px;margin:0 0 8px}.site-footer{margin-top:46px;background:var(--ink);color:var(--bg);border-top:1px solid var(--yellow)}.footer-inner{width:min(calc(100% - 32px),var(--max));margin:auto;padding:36px 0 76px}.footer-top{display:grid;grid-template-columns:240px 1fr;gap:28px;padding-bottom:22px;border-bottom:1px solid rgba(245,237,203,.16)}.footer-brand{display:flex;align-items:center;gap:10px}.footer-brand span{display:grid}.footer-brand strong{color:var(--yellow)}.footer-brand small{font-size:12px}.footer-top p{margin:0;font-size:13px}.footer-columns{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:24px 0}.footer-columns h2{font-size:13px;margin:0 0 8px;color:var(--yellow)}.footer-columns a{display:block;padding:4px 0;font-size:13px}.footer-bottom{display:flex;flex-wrap:wrap;gap:16px;border-top:1px solid rgba(245,237,203,.16);padding-top:16px;font-size:13px}.screen-mask{position:fixed;inset:0;z-index:80;background:rgba(20,18,11,.5);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.screen-mask.is-visible{opacity:1;visibility:visible;pointer-events:auto}.menu-panel{position:fixed;z-index:90;right:0;top:22px;width:min(430px,88vw);max-height:calc(100vh - 22px);overflow:auto;background:var(--surface);border-left:1px solid var(--line);box-shadow:var(--shadow);transform:translateX(103%);visibility:hidden;pointer-events:none;transition:.22s}.menu-panel[aria-hidden="false"]{transform:translateX(0);visibility:visible;pointer-events:auto}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line)}.panel-brand{display:flex;align-items:center;gap:10px}.panel-brand span{display:grid}.panel-brand small{font-size:11px;color:var(--muted)}.panel-groups{padding:8px 16px 20px}.panel-groups h2{font-size:14px;margin:14px 0 6px}.panel-groups a{display:block;padding:9px 0;border-top:1px solid var(--line)}.panel-groups strong{display:block}.panel-groups span{display:block;font-size:12px;color:var(--muted)}.search-panel{position:fixed;z-index:95;left:0;right:0;top:84px;visibility:hidden;pointer-events:none;opacity:0;transform:translateY(-10px);transition:.2s}.search-panel[aria-hidden="false"]{visibility:visible;pointer-events:auto;opacity:1;transform:translateY(0)}.search-card{width:min(calc(100% - 32px),680px);margin:auto;background:var(--surface);border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:var(--shadow);padding-bottom:16px}.search-card label,.search-row,.search-links,.search-hint{margin-left:16px;margin-right:16px}.search-card label{display:block;margin-top:14px;font-weight:800}.search-row{display:grid;grid-template-columns:1fr auto;gap:8px;margin-top:8px}.search-row input{min-width:0;height:44px;border:1px solid var(--ink);border-radius:12px;padding:0 12px;background:#fff}.search-row button{height:44px;border:0;border-radius:12px;background:var(--ink);color:var(--yellow);padding:0 14px;font-weight:800}.search-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.search-links a{padding:7px 10px;background:var(--soft);border-radius:999px}.search-hint{font-size:12px;color:var(--muted);margin-bottom:0}.mobile-nav{display:none}
@media(max-width:820px){.desktop-focus{display:none}.hero-grid,.feature-rail,.cards-2,.cards-3,.note-grid{grid-template-columns:1fr}.step-band{grid-template-columns:repeat(2,1fr)}.mosaic{grid-template-columns:1fr 1fr}.mosaic article:first-child{grid-row:auto;grid-column:span 2}.footer-top{grid-template-columns:1fr}.footer-columns{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){body{padding-bottom:calc(50px + env(safe-area-inset-bottom))}.site-main{padding-top:84px}.hero{padding-top:32px}.hero h1{font-size:32px}.step-band,.mosaic{grid-template-columns:1fr}.mosaic article:first-child{grid-column:auto}.timeline article,.strip-list article{grid-template-columns:1fr}.mobile-nav{position:fixed;z-index:75;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(4,1fr);height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--surface);border-top:1px solid var(--line)}.mobile-nav a{display:flex;align-items:center;justify-content:center;height:50px;font-size:13px;font-weight:800}.mobile-nav a.is-active{background:var(--yellow);color:var(--ink)}.search-panel{inset:0;top:0;background:var(--ink)}.search-panel[aria-hidden="false"]{transform:none}.search-card{width:100%;height:100%;border:0;border-radius:0;background:var(--ink);color:var(--yellow);overflow:auto;padding-top:env(safe-area-inset-top)}.search-card .panel-close{background:transparent;color:var(--yellow);border-color:var(--yellow)}.search-card label{color:var(--yellow)}.search-row{grid-template-columns:1fr}.search-row button{background:var(--yellow);color:var(--ink)}.search-links a{background:rgba(242,198,43,.12);border:1px solid rgba(242,198,43,.35)}.search-hint{color:var(--bg)}.footer-inner{padding-bottom:28px}}
@media(max-width:420px){.menu-button{padding:0 10px}.brand-logo{max-width:125px}.footer-columns{grid-template-columns:1fr}}
