:root {
    --glass-bg: rgba(25, 25, 30, 0.65);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --accent-red: #ff3b30;
    --accent-blue: #0a84ff;
    --accent-green: #30d158;
    --accent-purple: #bf5af2;
    --accent-orange: #ff9f0a;
}

body {
    background: radial-gradient(circle at 50% 0%, #1a1a2e, #0f0f16);
    background-attachment: fixed;
    color: #fff;
}

.sound-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    align-items: start;
    margin-top: 1rem;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 1.5rem;
    box-shadow: var(--glass-shadow);
}

.controls-panel {
    position: sticky;
    top: 100px;
}

.controls-panel h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff, #aaa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

.control-group {
    margin-bottom: 1.25rem;
    background: rgba(0,0,0,0.2);
    padding: 1rem;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.05);
}

.control-group label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #aaa;
    margin-bottom: 0.5rem;
}

.control-group span {
    color: var(--accent-blue);
    font-weight: bold;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(255,255,255,0.5);
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-top: 1rem;
}

.action-buttons button {
    padding: 0.75rem;
    border-radius: 12px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    background: rgba(255,255,255,0.1);
    color: #fff;
}

.action-buttons button:hover:not(:disabled) {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

#btnRecord {
    background: rgba(255, 59, 48, 0.2);
    color: var(--accent-red);
    border: 1px solid rgba(255, 59, 48, 0.4);
}

#btnRecord:hover:not(:disabled) {
    background: rgba(255, 59, 48, 0.4);
    box-shadow: 0 0 15px rgba(255, 59, 48, 0.3);
}

#btnRecord.recording {
    background: var(--accent-red);
    color: #fff;
    animation: pulse-red 1.5s infinite;
}

@keyframes pulse-red {
    0% { box-shadow: 0 0 0 0 rgba(255, 59, 48, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(255, 59, 48, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 59, 48, 0); }
}

.pad-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.pad {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    aspect-ratio: 1.2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    cursor: pointer;
    user-select: none;
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    color: #fff;
    box-shadow: inset 0 0 0 0 rgba(255,255,255,0), 0 10px 20px -5px rgba(0,0,0,0.5);
    position: relative;
    overflow: hidden;
}

.pad::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: opacity 0.2s;
}

.pad:hover {
    transform: translateY(-5px);
    border-color: rgba(255,255,255,0.3);
    box-shadow: 0 15px 25px -5px rgba(0,0,0,0.6);
}

.pad:hover::before {
    opacity: 1;
}

.pad:active, .pad.active {
    transform: translateY(2px) scale(0.95);
    box-shadow: 0 5px 10px -5px rgba(0,0,0,0.8);
}

kbd {
    display: inline-block;
    background: rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 6px;
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    margin-top: 0.8rem;
    font-family: monospace;
    box-shadow: 0 2px 0 rgba(0,0,0,0.5);
    color: #aaa;
}

.pad:active kbd, .pad.active kbd {
    box-shadow: 0 0 0 rgba(0,0,0,0.5);
    transform: translateY(2px);
}

/* Glassmorphism Pad Colors */
.preset-kick { border-bottom: 3px solid var(--accent-red); }
.preset-kick:active, .preset-kick.active { background: rgba(255, 59, 48, 0.2); box-shadow: 0 0 30px rgba(255, 59, 48, 0.4); border-color: var(--accent-red); }

.preset-snare { border-bottom: 3px solid var(--accent-orange); }
.preset-snare:active, .preset-snare.active { background: rgba(255, 159, 10, 0.2); box-shadow: 0 0 30px rgba(255, 159, 10, 0.4); border-color: var(--accent-orange); }

.preset-hihat { border-bottom: 3px solid #ffd60a; }
.preset-hihat:active, .preset-hihat.active { background: rgba(255, 214, 10, 0.2); box-shadow: 0 0 30px rgba(255, 214, 10, 0.4); border-color: #ffd60a; }

.preset-laser { border-bottom: 3px solid var(--accent-green); }
.preset-laser:active, .preset-laser.active { background: rgba(48, 209, 88, 0.2); box-shadow: 0 0 30px rgba(48, 209, 88, 0.4); border-color: var(--accent-green); }

.preset-jump { border-bottom: 3px solid var(--accent-blue); }
.preset-jump:active, .preset-jump.active { background: rgba(10, 132, 255, 0.2); box-shadow: 0 0 30px rgba(10, 132, 255, 0.4); border-color: var(--accent-blue); }

.preset-coin { border-bottom: 3px solid 32ade6; }
.preset-coin:active, .preset-coin.active { background: rgba(50, 173, 230, 0.2); box-shadow: 0 0 30px rgba(50, 173, 230, 0.4); border-color: #32ade6; }

.preset-explosion { border-bottom: 3px solid var(--accent-purple); }
.preset-explosion:active, .preset-explosion.active { background: rgba(191, 90, 242, 0.2); box-shadow: 0 0 30px rgba(191, 90, 242, 0.4); border-color: var(--accent-purple); }

.preset-powerup { border-bottom: 3px solid #ff375f; }
.preset-powerup:active, .preset-powerup.active { background: rgba(255, 55, 95, 0.2); box-shadow: 0 0 30px rgba(255, 55, 95, 0.4); border-color: #ff375f; }

#spectrumCanvas {
    width: 100%;
    height: 120px;
    border-radius: 16px;
    background: rgba(0,0,0,0.4);
    margin-top: 1.5rem;
    border: 1px solid rgba(255,255,255,0.05);
    box-shadow: inset 0 5px 15px rgba(0,0,0,0.5);
}

.sequencer-panel {
    grid-column: 1 / -1;
    margin-top: 1rem;
    padding: 1.5rem;
}

.seq-grid {
    display: grid;
    grid-template-columns: 80px repeat(16, 1fr);
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 1rem;
}

.seq-cell {
    aspect-ratio: 1;
    background: rgba(255,255,255,0.05);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.1s;
    border: 1px solid transparent;
}

.seq-cell:hover {
    background: rgba(255,255,255,0.1);
}

.seq-cell.active {
    background: var(--accent-blue);
    box-shadow: 0 0 10px var(--accent-blue);
}

.seq-cell.playing {
    border-color: #fff;
    transform: scale(1.1);
}

.seq-row-label {
    display: flex;
    align-items: center;
    font-size: 0.8rem;
    color: #aaa;
    font-weight: 600;
}

@media (max-width: 900px) {
    .sound-layout { grid-template-columns: 1fr; }
    .controls-panel { position: static; }
}