:root{--metro-bg:#08090b;--metro-card:#111318;--metro-card-hover:#1a1d24;--metro-border:#ffffff0f;--metro-border-hover:#ffffff1a;--metro-ink:#f5f0e8;--metro-ink-soft:#c8c5be;--metro-ink-muted:#92908a;--metro-gold:#d9a441;--metro-gold-hover:#e5b85c;--metro-surface:#15171c;--metro-shadow:0 8px 32px #0000004d;--metro-shadow-hover:0 12px 40px #00000073;--metro-dot-inactive:#ffffff1a;--metro-dot-accent:#ffffff26;--metro-slider-track:#ffffff14;--metro-ring-bg:#ffffff14}body.light-mode,.light-mode{--metro-bg:#f7f4ee;--metro-card:#fff;--metro-card-hover:#faf7f2;--metro-border:#e7e1d8;--metro-border-hover:#d4cec5;--metro-ink:#191919;--metro-ink-soft:#66635f;--metro-ink-muted:#8a8680;--metro-gold:#c88a32;--metro-gold-hover:#b57a28;--metro-surface:#f7f4ee;--metro-shadow:0 4px 24px #0000000a;--metro-shadow-hover:0 8px 32px #00000014;--metro-dot-inactive:#e7e1d8;--metro-dot-accent:#d4cec5;--metro-slider-track:#e7e1d8;--metro-ring-bg:#e7e1d8}.metro-page{width:min(900px,92%);margin:0 auto;padding:2rem 0 4rem}.metro-hero{text-align:center;margin-bottom:2rem}.metro-hero-title{color:var(--metro-ink);letter-spacing:-.5px;margin:0 0 .5rem;font-family:DM Serif Display,Georgia,serif;font-size:clamp(1.8rem,4vw,2.8rem);font-weight:400}.metro-hero-sub{color:var(--metro-ink-soft);margin:0;font-family:DM Sans,sans-serif;font-size:.9rem}.metro-hero-line{background:var(--metro-gold);width:50px;height:2px;margin:1rem auto 0}.metro-card{background:var(--metro-card);border:1px solid var(--metro-border);box-shadow:var(--metro-shadow);border-radius:18px;flex-direction:column;align-items:center;gap:1.5rem;padding:2.5rem;transition:background .3s,border-color .3s;display:flex}.metro-bpm-display{position:relative}.metro-bpm-ring{width:180px;height:180px;position:relative}.metro-bpm-svg{width:100%;height:100%}.metro-bpm-svg circle:first-child{stroke:var(--metro-ring-bg)}.metro-bpm-svg circle:last-child{stroke:var(--metro-gold)}.metro-bpm-inner{flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.metro-bpm-val{color:var(--metro-ink);font-family:DM Serif Display,Georgia,serif;font-size:3.2rem;font-weight:400;line-height:1}.metro-bpm-label{color:var(--metro-ink-muted);text-transform:uppercase;letter-spacing:.1em;margin-top:.2rem;font-family:DM Sans,sans-serif;font-size:.7rem;font-weight:700}.metro-beat-dots{justify-content:center;gap:10px;margin-top:1rem;display:flex}.metro-beat-dot{background:var(--metro-dot-inactive);border-radius:50%;width:14px;height:14px;transition:all 80ms}.metro-beat-dot.accent{background:var(--metro-dot-accent);width:18px;height:18px}.metro-beat-dot.active{background:var(--metro-gold);transform:scale(1.3);box-shadow:0 0 12px #c88a3266}.metro-beat-dot.accent.active{background:var(--metro-gold)}.metro-controls{align-items:center;gap:1rem;width:100%;max-width:400px;display:flex}.metro-btn{cursor:pointer;border:none;font-family:DM Sans,sans-serif;transition:all .15s}.metro-btn-round{background:var(--metro-surface);border:1px solid var(--metro-border);width:40px;height:40px;color:var(--metro-ink);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:1.2rem;font-weight:700;display:flex}.metro-btn-round:hover{background:var(--metro-card-hover);border-color:var(--metro-border-hover)}.metro-slider{-webkit-appearance:none;appearance:none;background:var(--metro-slider-track);border-radius:3px;outline:none;flex:1;height:6px}.metro-slider::-webkit-slider-thumb{-webkit-appearance:none;background:var(--metro-gold);cursor:pointer;border:3px solid var(--metro-card);border-radius:50%;width:22px;height:22px;box-shadow:0 2px 6px #00000026}.metro-slider::-moz-range-thumb{background:var(--metro-gold);cursor:pointer;border:3px solid var(--metro-card);border-radius:50%;width:22px;height:22px;box-shadow:0 2px 6px #00000026}.metro-actions{gap:1rem;width:100%;max-width:400px;display:flex}.metro-btn-tap{background:var(--metro-surface);border:1px solid var(--metro-border);color:var(--metro-ink-soft);border-radius:12px;flex:1;justify-content:center;align-items:center;gap:.5rem;padding:.9rem;font-size:.85rem;font-weight:600;display:flex}.metro-btn-tap:hover{background:var(--metro-card-hover);border-color:var(--metro-border-hover);color:var(--metro-ink)}.metro-btn-tap:active{transform:scale(.97)}.metro-tap-icon{font-size:1.1rem}.metro-btn-start{background:var(--metro-gold);color:#fff;border-radius:12px;flex:1.5;justify-content:center;align-items:center;gap:.5rem;padding:.9rem;font-size:.9rem;font-weight:700;display:flex;box-shadow:0 4px 14px #c88a324d}.metro-btn-start:hover{background:var(--metro-gold-hover);box-shadow:0 6px 18px #c88a3266}.metro-btn-start:active{transform:scale(.97)}.metro-start-icon{font-size:1rem}.metro-ts-section,.metro-sound-section{width:100%;max-width:400px}.metro-ts-label{color:var(--metro-ink-muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:.5rem;font-family:DM Sans,sans-serif;font-size:.7rem;font-weight:700;display:block}.metro-ts-group{flex-wrap:wrap;gap:.4rem;display:flex}.metro-ts-btn{background:var(--metro-surface);border:1px solid var(--metro-border);color:var(--metro-ink-soft);cursor:pointer;border-radius:8px;padding:.5rem 1rem;font-family:DM Sans,sans-serif;font-size:.8rem;font-weight:600;transition:all .15s}.metro-ts-btn:hover{border-color:var(--metro-gold);color:var(--metro-gold)}.metro-ts-btn.active{background:var(--metro-gold);color:#fff;border-color:var(--metro-gold)}.metro-mute-row{gap:1.5rem;width:100%;max-width:400px;display:flex}.metro-mute-label{color:var(--metro-ink-soft);cursor:pointer;align-items:center;gap:.5rem;font-family:DM Sans,sans-serif;font-size:.8rem;display:flex}.metro-mute-label input[type=checkbox]{accent-color:var(--metro-gold);width:16px;height:16px}.metro-ref,.metro-howto{margin-top:2.5rem}.metro-ref-title{color:var(--metro-ink);text-align:center;margin:0 0 1.25rem;font-family:DM Serif Display,Georgia,serif;font-size:1.4rem;font-weight:400}.metro-ref-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:.75rem;display:grid}.metro-ref-card{background:var(--metro-card);border:1px solid var(--metro-border);text-align:center;border-radius:12px;padding:1rem;transition:all .2s}.metro-ref-card:hover{border-color:var(--metro-gold)}.metro-ref-card.active{border-color:var(--metro-gold);background:#c88a320a}.metro-ref-range{color:var(--metro-ink);margin-bottom:.25rem;font-family:DM Serif Display,Georgia,serif;font-size:1.1rem;display:block}.metro-ref-card.active .metro-ref-range{color:var(--metro-gold)}.metro-ref-name{color:var(--metro-ink-soft);margin-bottom:.15rem;font-family:DM Sans,sans-serif;font-size:.78rem;font-weight:700;display:block}.metro-ref-desc{color:var(--metro-ink-muted);font-family:DM Sans,sans-serif;font-size:.68rem;display:block}.metro-howto-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:1rem;display:grid}.metro-howto-card{background:var(--metro-card);border:1px solid var(--metro-border);border-radius:12px;padding:1.25rem;transition:box-shadow .2s}.metro-howto-card:hover{box-shadow:var(--metro-shadow-hover)}.metro-howto-num{background:var(--metro-gold);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;margin-bottom:.75rem;font-family:DM Sans,sans-serif;font-size:.75rem;font-weight:800;display:flex}.metro-howto-card h3{color:var(--metro-ink);margin:0 0 .4rem;font-family:DM Sans,sans-serif;font-size:.85rem;font-weight:700}.metro-howto-card p{color:var(--metro-ink-soft);margin:0;font-family:DM Sans,sans-serif;font-size:.78rem;line-height:1.55}@media (width<=600px){.metro-card{padding:1.5rem}.metro-bpm-ring{width:150px;height:150px}.metro-bpm-val{font-size:2.6rem}.metro-actions{flex-direction:column}.metro-mute-row{flex-direction:column;gap:.75rem}.metro-ref-grid{grid-template-columns:repeat(2,1fr)}.metro-howto-grid{grid-template-columns:1fr}}