:root{--bg: #1c1b18;--surface: #232019;--surface-2: #2c2820;--border: #3a362c;--text: #ede7d8;--muted: #948d7a;--brass: #b8874a;--brass-bright: #d9a441;--oil: #5c8d8a;--rust: #c1502e;--ok: #8aa36b}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased}#root{min-height:100vh}a{color:inherit}button,input,select{font-family:inherit;color:inherit}.mono{font-family:SF Mono,Roboto Mono,Consolas,monospace;font-variant-numeric:tabular-nums}.disp{font-weight:800;text-transform:uppercase;letter-spacing:.02em}.app-shell{display:flex;min-height:100vh}.mobile-header{position:fixed;top:0;left:0;right:0;z-index:10;background:var(--bg);border-bottom:1px solid var(--border);padding:14px 16px;display:flex;align-items:center;justify-content:space-between}.content{flex:1;min-width:0;min-height:100vh;display:flex;flex-direction:column;padding:76px 16px 90px;max-width:720px;margin:0 auto;width:100%}.content-body{flex:1}.tab-bar{position:fixed;bottom:0;left:0;right:0;z-index:10;display:flex;border-top:1px solid var(--border);background:var(--surface)}.tab-link{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:10px 0 12px;color:var(--muted);font-size:.66rem;letter-spacing:.03em;text-decoration:none}.tab-link.active{color:var(--brass-bright)}.sidebar{display:none}@media(min-width:900px){.mobile-header,.tab-bar{display:none}.sidebar{display:flex;flex-direction:column;width:220px;flex-shrink:0;border-right:1px solid var(--border);padding:20px 16px;position:sticky;top:0;height:100vh}.content{padding:32px 32px 60px;max-width:900px}}.wordmark{font-size:1.15rem;margin-bottom:22px}.bike-select-wrap{margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid 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var(--border);display:flex;align-items:center;justify-content:space-between}.page-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}.page-title{font-size:1.2rem;margin:0}.chains-grid{display:grid;grid-template-columns:1fr;gap:14px}@media(min-width:900px){.chains-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}}.chain-card{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:18px;display:flex;flex-direction:column;gap:10px;text-decoration:none;color:var(--text)}.chain-card.active{border-color:var(--brass);box-shadow:0 0 0 1px var(--brass)}.chain-card.retired{opacity:.75}.chain-card.unmounted{border-style:dashed}.card-top{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}.chain-name{font-size:1.15rem}.chain-model{font-size:.68rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin-top:4px}.status-badge{font-size:.62rem;text-transform:uppercase;letter-spacing:.08em;padding:3px 8px;border-radius:3px;border:1px solid;flex-shrink:0}.status-badge.active{color:var(--brass-bright);border-color:var(--brass-bright)}.status-badge.retired{color:var(--muted);border-color:var(--border)}.status-badge.unmounted{color:var(--muted);border-color:var(--border);border-style:dashed}.km-row{display:flex;align-items:baseline;gap:7px}.km-number{font-size:2rem;font-weight:600}.km-unit{color:var(--muted);font-size:.85rem}.lube-chip{display:inline-flex;align-items:center;gap:5px;font-size:.66rem;text-transform:uppercase;letter-spacing:.05em;padding:4px 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0;border-bottom:1px solid var(--border);font-size:.84rem;align-items:baseline}.history-list .history-row{border-bottom:none}.history-dot{position:absolute;left:-18px;top:50%;transform:translateY(-50%);width:7px;height:7px;border-radius:50%;border:2px solid var(--bg);flex-shrink:0}.history-dot.installed{background:var(--brass-bright)}.history-dot.shelved{background:var(--muted)}.history-dot.lubed{background:var(--oil)}.history-label{flex:1}.history-date{color:var(--muted);font-size:.74rem}.history-gap{position:relative;padding:3px 0;font-size:.72rem;font-style:italic;color:var(--muted)}.field-error{color:var(--rust);font-size:.76rem;margin:6px 0 0}.form-row{display:flex;flex-direction:column;gap:5px;margin-bottom:14px}.form-row label{font-size:.7rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.form-row input,.form-row select{background:var(--surface-2);border:1px solid var(--border);color:var(--text);border-radius:5px;padding:8px 10px;font-size:.9rem}.form-row 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