:root{--bg:#f6f5f1;--panel:#fff;--text:#1c1c1a;--muted:#6b6a65;--track:#e7e5de;--flat:#d9822b;--sharp:#3b7bd6;--good:#2f9e5b;--line:#1c1c1a}@media (prefers-color-scheme:dark){:root{--bg:#121211;--panel:#1c1c1a;--text:#f1f0ec;--muted:#9a9892;--track:#2c2b28;--line:#f1f0ec}}*{box-sizing:border-box}body{background:var(--bg);min-height:100vh;color:var(--text);place-items:center;margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:grid}.tuner{background:var(--panel);border-radius:20px;width:min(560px,100vw - 32px);padding:28px;box-shadow:0 10px 40px #00000014}header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}h1{letter-spacing:.02em;margin:0;font-size:1.1rem}label{color:var(--muted);align-items:center;gap:8px;font-size:.85rem;display:flex}select{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--track);border-radius:8px;padding:6px 8px}.readout{text-align:center;margin:28px 0 20px}.note{font-variant-numeric:tabular-nums;font-size:5rem;font-weight:700;line-height:1}.freq{color:var(--muted);font-variant-numeric:tabular-nums;margin-top:8px}.scale,.sides{color:var(--muted);justify-content:space-between;font-size:.75rem;display:flex}.sides{margin-top:8px}.track{background:var(--track);border-radius:10px;height:44px;margin-top:6px;position:relative;overflow:hidden}.zone{background:color-mix(in srgb, var(--good) 22%, transparent);position:absolute;top:0;bottom:0}.center{background:var(--line);opacity:.5;width:2px;margin-left:-1px;position:absolute;top:0;bottom:0;left:50%}.gap{opacity:.45;border-radius:4px;transition:left 90ms linear,width 90ms linear;position:absolute;top:14px;bottom:14px}.marker{background:var(--muted);border-radius:4px;width:8px;margin-left:-4px;transition:left 90ms linear,background-color .15s;position:absolute;top:4px;bottom:4px}.meter[data-state=idle] .marker{opacity:.3}.meter[data-state=flat] .marker,.meter[data-state=flat] .gap{background:var(--flat)}.meter[data-state=sharp] .marker,.meter[data-state=sharp] .gap{background:var(--sharp)}.meter[data-state=good] .marker{background:var(--good);box-shadow:0 0 12px var(--good)}.advice{text-align:center;min-height:1.5em;margin:22px 0 0;font-size:1.15rem;font-weight:600}.advice.flat{color:var(--flat)}.advice.sharp{color:var(--sharp)}.advice.good{color:var(--good)}.diff{text-align:center;color:var(--muted);font-variant-numeric:tabular-nums;min-height:1.3em;margin:4px 0 0;font-size:.9rem}button{width:100%;font:inherit;background:var(--text);color:var(--panel);cursor:pointer;border:0;border-radius:12px;margin-top:24px;padding:14px;font-weight:600;display:block}button:focus-visible,select:focus-visible{outline:3px solid var(--sharp);outline-offset:2px}