:root{--bg:#0D0D0D;--deep:#070707;--panel:#171717;--sub:#222222;--title:#F2F2F2;--text:#C8C8C8;--muted:#9A9A9A;--soft:#6E6E6E;--silver:#C8C8C8;--bright:#E8E8E8;--ink:#1A1A1A;--mist:#B85A5A;--border:rgba(232,232,232,.12);--border-strong:rgba(232,232,232,.36);--shadow:0 12px 28px rgba(0,0,0,.45);--max:1120px)}
*{box-sizing:border-box}html{background:var(--bg);color-scheme:dark;scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}img{max-width:100%;display:block}.container{width:min(calc(100% - 32px),var(--max));margin-inline:auto}.skip-link{position:fixed;left:16px;top:-80px;z-index:1200;background:var(--bright);color:var(--bg);padding:10px 14px;border-radius:8px}.skip-link:focus{top:12px}.ink-line{position:fixed;inset:0 0 auto 0;height:22px;background:var(--deep);border-bottom:1px solid var(--border);z-index:900;font-size:12px}.top-inner,.bar-inner{width:min(calc(100% - 32px),var(--max));height:100%;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:16px}.text-button,.icon-button,.drawer-trigger{border:1px 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var(--border-strong);border-radius:10px;color:var(--bright)}.case-tabs{position:fixed;top:82px;left:0;right:0;height:40px;background:var(--deep);border-bottom:1px solid var(--border);z-index:880;display:flex;align-items:center;justify-content:center;gap:8px}.case-tabs a{min-height:32px;display:inline-flex;align-items:center;padding:0 18px;border-radius:8px;font-size:13px;color:var(--muted)}.case-tabs a.is-current{background:var(--silver);color:var(--bg)}.site-main{padding-top:122px;min-height:70vh}.page-hero{padding-top:38px;padding-bottom:24px}.eyebrow{margin:0 0 8px;color:var(--muted);font-size:12px;letter-spacing:.15em}.page-hero h1,.cover-copy h1{margin:0;color:var(--title);font-size:24px;line-height:1.3}.lead{max-width:850px;margin:16px 0 0;color:var(--text);font-size:15px}.media-slot{background:var(--ink);border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}.page-media{width:min(calc(100% - 32px),var(--max));height:220px;margin:0 auto 24px}.content-image{width:100%;height:100%;object-fit:contain;object-position:center}.content-stack{display:grid;gap:18px;padding-bottom:48px}.content-card{position:relative;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:24px;box-shadow:var(--shadow)}.content-card .section-index{font-size:12px;color:var(--soft);letter-spacing:.16em;margin-bottom:6px}.content-card h2,.home-section h2{margin:0 0 12px;color:var(--title);font-size:20px;line-height:1.4}.content-card h3{margin:18px 0 8px;color:var(--bright);font-size:16px}.content-card p{margin:0 0 12px}.content-card p:last-child{margin-bottom:0}.muted{color:var(--muted)}.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border-radius:10px;font-size:14px;border:1px solid var(--border-strong)}.btn-primary{background:linear-gradient(135deg,#E8E8E8 0%,#C8C8C8 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h3{margin:0 0 9px;color:var(--title);font-size:16px}.feature-copy p{margin:0 0 12px}.feature-copy a{color:var(--bright);font-weight:700}.split-card{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:20px;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:20px}.split-card .media-slot{height:200px}.number-list{display:grid;gap:10px}.number-row{display:grid;grid-template-columns:54px 1fr;gap:14px;align-items:start;border-top:1px solid var(--border);padding-top:14px}.number-row:first-child{border-top:0;padding-top:0}.number-row b{font-size:20px;color:var(--bright);font-weight:600}.shelf{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.shelf article{min-height:150px;background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:18px;display:flex;flex-direction:column;justify-content:space-between}.shelf h3{margin:0 0 8px;color:var(--title);font-size:16px}.shelf 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8px}.overlay{position:fixed;inset:0;background:rgba(0,0,0,.72);z-index:990;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.drawer{position:fixed;inset:0 auto 0 0;width:min(400px,86vw);background:var(--deep);border-right:1px solid var(--border-strong);z-index:1000;transform:translateX(-102%);visibility:hidden;pointer-events:none;transition:transform .24s ease,visibility .24s}.drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--border)}.drawer-scroll{height:calc(100vh - 72px);overflow:auto;padding:12px 16px 30px}.drawer-scroll section{padding:10px 0 14px}.drawer-scroll h2{margin:0 0 6px;color:var(--muted);font-size:12px;letter-spacing:.14em}.drawer-scroll a{display:block;padding:12px;border-radius:10px;border:1px solid transparent}.drawer-scroll a:hover{background:var(--panel);border-color:var(--border)}.drawer-scroll b{display:block;color:var(--bright);font-size:14px}.drawer-scroll span{display:block;color:var(--muted);font-size:12px;margin-top:2px}.search-shell{position:fixed;top:82px;left:50%;width:min(calc(100% - 32px),720px);z-index:1010;transform:translate(-50%,-20px);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.search-shell.is-open{transform:translate(-50%,12px);opacity:1;visibility:visible;pointer-events:auto}.search-card{background:var(--ink);border:1px solid var(--border-strong);border-radius:14px;padding:18px;box-shadow:var(--shadow)}.search-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.search-card label{display:block;color:var(--muted);margin-bottom:8px}.search-card input{width:100%;height:46px;border:1px solid var(--border-strong);background:var(--deep);color:var(--bright);border-radius:10px;padding:0 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@media (max-width:820px){.case-tabs{display:none}.site-main{padding-top:82px}.three-grid,.card-grid,.faq-grid{grid-template-columns:1fr}.split-card,.app-panel{grid-template-columns:1fr}.shelf{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-top{grid-template-columns:1fr}.footer-groups{grid-template-columns:repeat(2,minmax(0,1fr))}.site-footer{padding-bottom:88px}.search-shell{inset:0;width:100%;transform:none;background:var(--deep);padding:calc(22px + env(safe-area-inset-top)) 16px 70px;overflow:auto}.search-shell.is-open{transform:none}.search-card{min-height:calc(100vh - 92px);border:0;box-shadow:none;border-radius:0;background:var(--deep)}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;z-index:870;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--deep);border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(5,1fr)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-width:0;font-size:12px;color:var(--muted)}.mobile-bottom a.is-current{background:var(--silver);color:var(--bg)}.cover{padding-top:20px}.page-hero{padding-top:28px}.app-visual{height:320px}}
@media (max-width:520px){.top-inner,.bar-inner,.container,.page-media{width:calc(100% - 32px)}.brand-link{min-width:88px}.brand-fallback{font-size:15px}.app-link,.drawer-trigger{padding:0 12px}.cover-slot{height:260px}.shelf{grid-template-columns:1fr}.footer-groups{grid-template-columns:1fr 1fr}.content-card{padding:20px}.split-card{padding:16px}.home-section{padding:24px 0}.drawer{width:86vw}}