:root{--ink:#102a43;--muted:#52677b;--line:#dbe5ec;--soft:#f3f7f9;--brand:#087e8b;--accent:#f15946}*{box-sizing:border-box}body{margin:0;color:var(--ink);font-family:Inter,"Microsoft YaHei",system-ui,sans-serif}.site-header{height:64px;padding:0 clamp(16px,5vw,72px);display:flex;align-items:center;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:850}.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--brand);color:#fff}.shell{max-width:1440px;margin:auto;padding:clamp(18px,3.5vw,50px)}.crumb{color:var(--muted);font-size:13px}.crumb a{color:inherit}.intro h1{font-size:clamp(36px,4vw,58px);margin:12px 0 22px;letter-spacing:-.04em}.product{display:grid;grid-template-columns:minmax(300px,1fr) minmax(360px,.9fr);gap:clamp(24px,5vw,68px);align-items:start}.visual{position:sticky;top:16px;min-width:0}.frame{aspect-ratio:1;border-radius:24px;overflow:hidden;background:var(--soft);display:grid;place-items:center}.frame img{width:100%;height:100%;object-fit:contain}.chassis-nav{display:flex;gap:6px;overflow:auto;width:100%;padding:10px 0 0}.chassis-nav a{white-space:nowrap;border:1px solid var(--line);border-radius:999px;padding:6px 10px;text-decoration:none;font-size:13px}.chassis-nav a[aria-current=page]{background:var(--ink);color:#fff}.options h2{font-size:clamp(26px,2.6vw,38px);margin:0 0 10px}.option-grid{display:grid;gap:6px;margin:0 0 12px}.option-grid button{display:grid;grid-template-columns:72px 1fr auto;gap:8px;text-align:left;align-items:center;min-height:42px;padding:7px 10px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);font:inherit;cursor:pointer}.option-grid button[aria-pressed=true]{border-color:var(--brand);box-shadow:0 0 0 1px var(--brand);background:#f4fbfb}.option-grid strong{font-size:14px}.option-grid span{color:var(--muted);font-size:14px}.option-grid small{color:var(--brand);font-weight:800;font-size:13px}.price-note{margin:10px 0;color:var(--muted);font-size:12px}.actions{display:flex;gap:8px}.actions a{border:1px solid var(--ink);border-radius:999px;padding:9px 15px;text-decoration:none;font-weight:750}.actions .primary{background:var(--accent);border-color:var(--accent);color:#fff}.page-footer{border-top:1px solid var(--line);padding:18px clamp(16px,5vw,72px);display:flex;justify-content:space-between;color:var(--muted);font-size:13px}@media(max-width:820px){.product{grid-template-columns:1fr}.visual{position:static}.frame{max-width:620px;margin:auto}.option-grid{grid-template-columns:1fr 1fr}.option-grid button{grid-template-columns:1fr;gap:2px;min-height:64px}.actions{flex-direction:column;text-align:center}}@media(max-width:520px){.brand span:last-child{display:none}.shell{padding:16px}.intro h1{font-size:38px;margin-bottom:14px}.chassis-nav a{min-height:40px;display:flex;align-items:center}.option-grid{grid-template-columns:1fr}.option-grid button{grid-template-columns:68px 1fr auto;gap:6px;min-height:46px;padding:6px 9px}.page-footer{flex-direction:column;gap:4px}}