/* ==================== ROOT VARIABLES ==================== */
:root {
    --bg-dark: #0a0a0a;
    --bg-panel: #141414;
    --bg-light: #1e1e1e;
    --bg-lighter: #2a2a2a;
    --primary: #6366f1;
    --primary-light: #818cf8;
    --secondary: #06b6d4;
    --accent: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.2);
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
    --gradient-dark: linear-gradient(180deg, #141414 0%, #0a0a0a 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
}

/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

/* ==================== TOP BAR ==================== */
.top-bar {
    height: 60px;
    background: var(--gradient-dark);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    box-shadow: var(--shadow-md);
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.5rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo i {
    font-size: 2rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.transport-controls {
    display: flex;
    gap: 0.5rem;
}

.transport-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-light);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 1.3rem;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.transport-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: scale(1.1);
}

.transport-btn.play {
    background: var(--gradient-primary);
    border: none;
}

.transport-btn.play:hover {
    transform: scale(1.15);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

.time-display {
    display: flex;
    align-items: center;
    gap: 2rem;
    font-family: 'Courier New', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--bg-light);
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.bpm-display {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-light);
}

.menu-buttons {
    display: flex;
    gap: 0.5rem;
}

.menu-btn {
    padding: 0.6rem 1.2rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.menu-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ==================== WORKSPACE ==================== */
.workspace {
    display: grid;
    grid-template-columns: 250px 1fr 300px;
    flex: 1;
    height: calc(100% - 60px);
    overflow: hidden;
}

/* Left Panel - Track List */
.left-panel {
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header h3 {
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.add-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s;
}

.add-btn:hover {
    transform: scale(1.2) rotate(90deg);
}

.track-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.track-item {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.8rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.3s;
}

.track-item:hover {
    border-color: var(--primary);
    transform: translateX(5px);
}

.track-item.active {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary);
}

.track-info {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 0.5rem;
}

.track-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.track-name {
    font-weight: 600;
}

.track-controls {
    display: flex;
    gap: 0.5rem;
}

.track-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-lighter);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s;
}

.track-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.track-btn.mute.active {
    background: var(--warning);
    border-color: var(--warning);
}

.track-btn.solo.active {
    background: var(--success);
    border-color: var(--success);
}

/* Center - Sequencer */
.sequencer {
    background: var(--bg-dark);
    position: relative;
    overflow-x: auto;
    overflow-y: hidden;
}

.timeline-ruler {
    height: 40px;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    padding-left: 250px;
}

.track-lanes {
    min-height: 400px;
}

.playhead {
    position: absolute;
    top: 0;
    left: 250px;
    width: 2px;
    height: 100%;
    background: var(--danger);
    z-index: 100;
    pointer-events: none;
}

/* Right Panel */
.right-panel {
    background: var(--bg-panel);
    border-left: 1px solid var(--border);
    padding: 1rem;
    overflow-y: auto;
}

/* ==================== BOTTOM PANEL ==================== */
.bottom-panel {
    height: 350px;
    background: var(--bg-panel);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.panel-tabs {
    display: flex;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
}

.tab {
    padding: 0.8rem 2rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border-bottom: 2px solid transparent;
}

.tab:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.1);
}

.tab.active {
    color: var(--primary-light);
    border-bottom-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.tab-content {
    flex: 1;
    display: none;
    overflow: hidden;
}

.tab-content.active {
    display: block;
}

/* Drum Machine */
.drum-machine {
    padding: 1.5rem;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    height: 100%;
}

.drum-pads {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.pad-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.drum-pad {
    aspect-ratio: 1;
    background: var(--bg-light);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.1s;
    font-weight: 600;
    font-size: 0.85rem;
}

.drum-pad:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.2);
}

.drum-pad:active,
.drum-pad.active {
    background: var(--gradient-primary);
    border-color: var(--primary);
    transform: scale(0.95);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

.step-sequencer {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.step-row {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.step-label {
    width: 60px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.step {
    width: 30px;
    height: 40px;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.step:hover {
    border-color: var(--primary);
}

.step.active {
    background: var(--gradient-primary);
    border-color: var(--primary);
}

.step.current {
    border-color: var(--text-primary);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* Piano Roll */
.piano-roll {
    display: grid;
    grid-template-columns: 100px 1fr;
    height: 100%;
    overflow: hidden;
}

.piano-keys {
    background: var(--bg-light);
    border-right: 1px solid var(--border);
    overflow-y: hidden;
}

.piano-key {
    height: 30px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding-left: 0.5rem;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.piano-key.white {
    background: white;
    color: black;
}

.piano-key.black {
    background: var(--bg-dark);
    color: white;
}

.piano-key:hover {
    background: var(--primary);
}

.piano-grid {
    background: var(--bg-dark);
    position: relative;
    overflow: auto;
}

/* MIDI Keyboard */
.midi-keyboard {
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.midi-keys {
    display: flex;
    gap: 2px;
}

.midi-key {
    width: 40px;
    height: 150px;
    background: white;
    border-radius: 0 0 5px 5px;
    cursor: pointer;
    transition: all 0.1s;
    position: relative;
}

.midi-key.black {
    width: 30px;
    height: 100px;
    background: var(--bg-dark);
    margin-left: -15px;
    margin-right: -15px;
    z-index: 1;
}

.midi-key:active,
.midi-key.active {
    background: var(--primary);
    transform: translateY(2px);
}

.midi-key.black:active,
.midi-key.black.active {
    background: var(--primary);
}

/* ==================== SIDE PANELS ==================== */
.side-panel {
    position: fixed;
    top: 60px;
    right: -400px;
    width: 400px;
    height: calc(100% - 60px);
    background: var(--bg-panel);
    border-left: 1px solid var(--border);
    z-index: 2000;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.side-panel.active {
    right: 0;
}

.side-panel .panel-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: var(--bg-panel);
}

.close-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-light);
    border: 1px solid var(--border);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s;
}

.close-btn:hover {
    background: var(--danger);
    border-color: var(--danger);
    transform: rotate(90deg);
}

/* Mixer */
.mixer-channels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 1rem;
    padding: 1rem;
}

.mixer-channel {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
}

.channel-fader {
    height: 200px;
    display: flex;
    justify-content: center;
    margin: 1rem 0;
}

.fader {
    writing-mode: bt-lr;
    -webkit-appearance: slider-vertical;
    width: 40px;
    height: 100%;
    background: var(--bg-dark);
    border-radius: 5px;
}

/* Synth Controls */
.synth-controls {
    padding: 1rem;
}

.synth-controls h4 {
    margin: 1.5rem 0 1rem;
    color: var(--primary-light);
}

.osc-control,
.filter-control,
.envelope-control {
    margin-bottom: 1rem;
}

.osc-control label,
.filter-control label,
.envelope-control label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-light);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.5);
}

select {
    width: 100%;
    padding: 0.6rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    cursor: pointer;
}

/* Sample Browser */
.sample-browser {
    padding: 1rem;
}

.sample-category {
    margin-bottom: 1.5rem;
}

.sample-category h4 {
    color: var(--primary-light);
    margin-bottom: 0.8rem;
}

.sample-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sample-item {
    padding: 0.8rem;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: grab;
    transition: all 0.3s;
}

.sample-item:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.sample-item:active {
    cursor: grabbing;
}

/* Effects Chain */
.effects-chain {
    padding: 1rem;
}

.effect-unit {
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1rem;
}

.effect-unit h4 {
    color: var(--primary-light);
    margin-bottom: 1rem;
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1200px) {
    .workspace {
        grid-template-columns: 200px 1fr;
    }
    
    .right-panel {
        display: none;
    }
}

@media (max-width: 768px) {
    .top-bar {
        flex-wrap: wrap;
        height: auto;
        padding: 1rem;
        gap: 1rem;
    }
    
    .workspace {
        grid-template-columns: 1fr;
    }
    
    .left-panel {
        display: none;
    }
    
    .drum-machine {
        grid-template-columns: 1fr;
    }
    
    .side-panel {
        width: 100%;
        right: -100%;
    }
}