:root{--bg:#f8fafc;--card:#fff;--line:#f1f5f9;--line-strong:#e2e8f0;--ink:#0f172a;--ink-soft:#475569;--ink-mute:#94a3b8;--brand:#0f0e0c;--brand-hover:#1c1b18;--ok-bg:#ecfdf5;--ok-line:#a7f3d0;--ok-ink:#047857;--err-bg:#fef2f2;--err-line:#fecaca;--err-ink:#dc2626;--track:#f1f5f9}html.dark{--bg:#0f0e0c;--card:#ffffff0d;--line:#ffffff14;--line-strong:#ffffff24;--ink:#fff;--ink-soft:#cbd5e1;--ink-mute:#64748b;--brand:#fff;--brand-hover:#f1f5f9;--ok-bg:#10b9811a;--ok-line:#10b98140;--ok-ink:#6ee7b7;--err-bg:#ef44441a;--err-line:#ef444440;--err-ink:#fca5a5;--track:#ffffff1a}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:15px;line-height:1.6;transition:background .2s,color .2s}.hidden{display:none!important}.page-header{border-bottom:1px solid 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label.checked{border-color:var(--brand);background:var(--brand);color:var(--bg)}html.dark .size-grid label.checked{color:#0f0e0c}.size-grid input{display:none}.custom-size-control{align-items:stretch;gap:8px;display:flex}.custom-size-input{border:1px solid var(--line-strong);background:var(--card);width:88px;min-width:0;color:var(--ink);border-radius:6px;padding:6px 9px;font-size:13px}.custom-size-input:focus{border-color:var(--ink-mute);outline:none}.custom-size-add{border:1px solid var(--line-strong);width:32px;color:var(--ink);cursor:pointer;background:0 0;border-radius:6px;font-size:18px;line-height:1}.custom-size-add:hover{background:var(--track)}.seg-list{flex-direction:column;gap:8px;display:flex}.seg-btn{text-align:left;border:1px solid var(--line-strong);color:var(--ink-soft);cursor:pointer;background:0 0;border-radius:12px;padding:9px 14px;font-size:13.5px;font-weight:500;transition:background .15s,border-color .15s,color 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