body { font-family: 'Segoe UI', sans-serif; background-color: #0d1117; color: #adbac7; margin: 0; display: flex; height: 100vh; overflow: hidden; }

/* SIDEBAR */
.sidebar { width: 260px; background-color: #161b22; border-right: 1px solid #30363d; display: flex; flex-direction: column; padding: 20px; }
.sidebar-header { font-size: 22px; font-weight: bold; margin-bottom: 30px; text-align: center; }
.nav-links { list-style: none; padding: 0; flex-grow: 1; }
.nav-links li { padding: 12px; margin-bottom: 8px; border-radius: 8px; cursor: pointer; transition: 0.2s; }
.nav-links li:hover { background: #21262d; }
.nav-links li.active { background: #7ca352; color: white; }
.add-run-btn { width: 100%; padding: 12px; background: #21262d; color: #adbac7; border: 1px solid #30363d; border-radius: 6px; cursor: pointer; font-weight: bold; }

/* MAIN CONTENT */
.main-content { flex-grow: 1; padding: 40px; overflow-y: auto; }
.category-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; }
.cat-card { background: #161b22; border: 1px solid #30363d; padding: 30px; border-radius: 12px; text-align: center; font-weight: bold; cursor: pointer; transition: 0.3s; }
.cat-card:hover { transform: translateY(-5px); border-color: #7ca352; }

/* PLAYER UI */
.music-player {
    position: fixed; bottom: 20px; right: 20px;
    background: #161b22; padding: 15px 25px; border-radius: 15px;
    display: flex; align-items: center; gap: 15px;
    border: 1px solid #30363d; box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    z-index: 1000;
}
.disc-art { width: 50px; height: 50px; border-radius: 50%; animation: rotate 8s linear infinite; animation-play-state: paused; object-fit: cover; }
@keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.track-info { min-width: 100px; }
.track-name { font-weight: bold; color: #f0f6fc; font-size: 14px; }
.track-author { font-size: 12px; color: #8b949e; }
.player-controls { display: flex; align-items: center; gap: 10px; }
.player-controls button { background: none; border: none; color: #adbac7; cursor: pointer; font-size: 18px; transition: 0.2s; }
.player-controls button:hover { color: #7ca352; transform: scale(1.1); }
.main-btn { font-size: 24px !important; }

/* MODAL */
.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.8); display: flex; justify-content: center; align-items: center; z-index: 2000; }
.modal-content { background: #161b22; padding: 30px; border-radius: 12px; text-align: center; border: 1px solid #30363d; }
.action-btn { background: #7ca352; color: white; border: none; padding: 10px 20px; border-radius: 6px; cursor: pointer; font-weight: bold; }