*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--bg: #0a0a0a;--surface: #161616;--accent: #1db954;--accent-hover: #1ed760;--text: #f1f1f1;--text-muted: #888;--radius: 10px}html{font-family:Inter,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);-webkit-tap-highlight-color:transparent}body{min-height:100dvh;display:flex;justify-content:center}#app{width:100%;max-width:480px;padding:0 16px 40px}header{padding:20px 0 8px;text-align:center}header h1{font-size:1.6rem;font-weight:800;letter-spacing:-.02em}header h1 span{color:var(--accent)}header p{color:var(--text-muted);font-size:.8rem;margin-top:4px}.user-bar{display:flex;align-items:center;gap:10px;background:var(--surface);border-radius:var(--radius);padding:12px 16px;margin:16px 0}.user-bar img{width:36px;height:36px;border-radius:50%}.user-bar .name{flex:1;font-size:.85rem;font-weight:600}.user-bar 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.15s}.bpm-btn:hover{border-color:var(--accent);color:var(--text)}.bpm-btn.active{background:var(--accent);border-color:var(--accent);color:#000}.btn-generate{width:100%;padding:16px;border:none;border-radius:var(--radius);background:var(--accent);color:#000;font-size:1rem;font-weight:700;cursor:pointer;transition:background .15s;margin-top:20px}.btn-generate:hover{background:var(--accent-hover)}.btn-generate:disabled{opacity:.5;cursor:not-allowed}.btn-login{width:100%;padding:16px;border:none;border-radius:var(--radius);background:var(--accent);color:#000;font-size:1rem;font-weight:700;cursor:pointer;margin-top:24px}.btn-login:hover{background:var(--accent-hover)}.generating{text-align:center;padding:40px 20px}.generating .spinner{width:40px;height:40px;border:3px solid #333;border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 16px}.generating p{color:var(--text-muted);font-size:.85rem}@keyframes 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