:root{--blue:#0b76ea;--blue-dark:#075bb8;--ink:#111;--muted:#5b6270;--bg:#f4f7fb;--card:#fff;--line:#e2e7ef;--good:#1a9c5b;--bad:#d64545;color:var(--ink);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}@media (prefers-color-scheme:dark){:root{--ink:#eef1f6;--muted:#a3abb8;--bg:#0f1218;--card:#181c24;--line:#2a303b}}*{box-sizing:border-box}body{background:var(--bg);margin:0}button{font:inherit;cursor:pointer}.app{max-width:640px;margin:0 auto;padding:24px 16px 48px}header{text-align:center}.logo{width:150px;height:150px}.tagline{color:var(--muted);margin:4px 0 20px}nav{background:var(--card);border:1px solid var(--line);border-radius:999px;margin-bottom:24px;padding:4px;display:inline-flex}nav button{color:var(--muted);background:0 0;border:0;border-radius:999px;padding:8px 20px;font-weight:600}nav button.active{background:var(--blue);color:#fff}.library-title{margin:0 0 16px;font-size:22px}.library-title 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