/* Design System & Core Variables */
:root {
    --bg-darker: #0b0c16;
    --bg-dark: #121324;
    --bg-card: rgba(22, 25, 49, 0.65);
    --bg-card-hover: rgba(29, 33, 64, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-active: rgba(0, 255, 255, 0.4);
    
    --text-primary: #f1f3f9;
    --text-secondary: #a0a6c0;
    --text-muted: #676d8b;

    --color-primary: #8f43ff;
    --color-primary-glow: rgba(143, 67, 255, 0.4);
    --color-accent: #00f0ff;
    --color-accent-glow: rgba(0, 240, 255, 0.35);
    --color-success: #00ff87;
    --color-success-glow: rgba(0, 255, 135, 0.3);
    --color-danger: #ff4a70;
    --color-danger-glow: rgba(255, 74, 112, 0.3);
    
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --border-radius: 12px;
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-darker);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(143, 67, 255, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 240, 255, 0.08) 0%, transparent 40%);
}

.app-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* App Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    color: var(--color-accent);
    width: 32px;
    height: 32px;
    filter: drop-shadow(0 0 8px var(--color-accent-glow));
    animation: wave-pulse 2s infinite ease-in-out;
}

@keyframes wave-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); filter: drop-shadow(0 0 12px var(--color-accent)); }
}

.logo-text h1 {
    font-size: 22px;
    line-height: 1.1;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 30%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text span {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Button & Tool Styles */
button {
    font-family: var(--font-heading);
    font-weight: 500;
    cursor: pointer;
    border: none;
    outline: none;
    border-radius: 8px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

button:active {
    transform: scale(0.97);
}

.btn-icon {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--color-accent);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    font-size: 14px;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-action {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    width: 38px;
    height: 38px;
}

.btn-action:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-action:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-danger {
    background: rgba(255, 74, 112, 0.1);
    color: var(--color-danger);
    border: 1px solid rgba(255, 74, 112, 0.2);
    padding: 8px 16px;
    font-size: 14px;
}

.btn-danger:hover {
    background: rgba(255, 74, 112, 0.25);
    border-color: var(--color-danger);
    box-shadow: 0 0 10px var(--color-danger-glow);
}

.btn-icon-danger {
    background: transparent;
    color: var(--text-muted);
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.btn-icon-danger:hover {
    color: var(--color-danger);
    background: rgba(255, 74, 112, 0.1);
}

.btn-success {
    background: linear-gradient(135deg, var(--color-success) 0%, #00d2c4 100%);
    color: #04100c;
    padding: 12px 28px;
    font-size: 16px;
    font-weight: 600;
    box-shadow: 0 4px 15px var(--color-success-glow);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--color-success);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, #bc34fa 100%);
    color: #ffffff;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--color-primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--color-primary);
}

/* Help Panel */
.help-panel {
    background: rgba(18, 19, 36, 0.95);
    border: 1px solid var(--border-color-active);
    border-radius: var(--border-radius);
    padding: 24px;
    margin-bottom: 10px;
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.15);
    animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.help-content h3 {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-accent);
}

.help-content p {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.help-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    border-bottom: 1px dashed var(--color-accent-glow);
}

.help-link:hover {
    color: #5effff;
    border-bottom-style: solid;
}

.help-content ul {
    margin-left: 20px;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.help-content li small {
    color: var(--text-secondary);
}

.help-panel.hidden {
    display: none;
}

/* Main Layout Grid */
.app-main {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 20px;
    align-items: start;
}

.app-column {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
}

@media (max-width: 992px) {
    .app-main {
        grid-template-columns: 1fr;
    }
}

/* Canvas Info Note */
.canvas-info-note {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.02);
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.canvas-info-note i {
    color: var(--color-accent);
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.workspace-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow-lg);
}

.section-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.section-header h2 {
    font-size: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #ffffff;
}

.section-header .subtitle {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Canvas Area styling */
.canvas-outer-container {
    width: 100%;
    background: #07080e;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    padding: 8px;
    overflow: hidden;
    position: relative;
}

.canvas-container {
    position: relative;
    width: 100%;
    aspect-ratio: 3/2;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 20px 20px;
    background-position: center;
    border-radius: 6px;
    overflow: hidden;
}

#draw-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
    z-index: 2;
}

.canvas-guidelines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.guideline-center {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 1px;
    background: rgba(255, 255, 255, 0.15);
    border-top: 1px dashed rgba(255, 255, 255, 0.25);
}

/* Canvas Control Panel */
.canvas-controls-panel {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    background: rgba(0, 0, 0, 0.2);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.tool-group, .history-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-tool {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
}

.btn-tool:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-tool.active {
    background: var(--color-primary-glow);
    color: #ffffff;
    border-color: var(--color-primary);
    box-shadow: 0 0 12px var(--color-primary-glow);
}

.brush-size-container {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 8px;
}

.brush-size-container .label {
    font-size: 13px;
    color: var(--text-secondary);
}

#brush-size-val {
    font-size: 13px;
    font-family: var(--font-heading);
    color: var(--color-accent);
    width: 42px;
    text-align: right;
}

/* Standard HTML Range styling */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    height: 6px;
    border-radius: 3px;
    outline: none;
    transition: background 0.3s;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    box-shadow: 0 0 8px var(--color-accent-glow);
    transition: transform 0.1s;
}

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

/* Presets & Image Upload */
.presets-panel {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    border-top: 1px dashed var(--border-color);
    padding-top: 16px;
}

.preset-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.btn-preset {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    font-size: 13px;
    border-radius: 20px;
}

.btn-preset:hover {
    background: rgba(0, 240, 255, 0.1);
    border-color: var(--color-accent);
    color: #ffffff;
}

.image-import-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.or-separator {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
}

.image-upload-label {
    font-size: 13px;
    padding: 6px 14px;
    border-radius: 20px;
}

/* Cards & Forms (Right Column) */
.card {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
}

.sound-source-card {
    display: flex;
    flex-direction: column;
}

.tab-header {
    display: flex;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    background: transparent;
    border-radius: 0;
    padding: 12px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
}

.tab-btn.active {
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-accent);
    border-bottom: 2px solid var(--color-accent);
}

.tab-btn:hover:not(.active) {
    background: rgba(255, 255, 255, 0.01);
    color: var(--text-primary);
}

.tab-contents {
    padding: 20px;
}

.tab-content-pane.hidden {
    display: none;
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-row.flex-row {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}

.form-row label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.help-tip-text {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 400;
    margin-top: 2px;
}

select {
    background: #090a12;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px;
    border-radius: 6px;
    font-family: var(--font-body);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

select:focus {
    border-color: var(--color-accent);
}

.slider-with-val {
    display: flex;
    align-items: center;
    gap: 12px;
}

.slider-with-val input[type="range"] {
    width: 140px;
}

.slider-with-val span {
    font-size: 13px;
    font-family: var(--font-heading);
    color: var(--color-accent);
    min-width: 45px;
    text-align: right;
}

/* Audio Uploader drag/drop zone */
.audio-dropzone {
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    padding: 24px 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.01);
}

.audio-dropzone:hover, .audio-dropzone.dragover {
    border-color: var(--color-accent);
    background: rgba(0, 240, 255, 0.03);
}

.upload-icon {
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    margin-bottom: 8px;
}

.audio-dropzone p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.audio-dropzone p span {
    color: var(--color-accent);
    font-weight: 500;
}

.upload-hint {
    font-size: 11px;
    color: var(--text-muted);
}

/* Uploaded Audio Info */
.uploaded-audio-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 8px;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.audio-file-meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.audio-file-meta i {
    color: var(--color-accent);
    width: 24px;
    height: 24px;
}

.file-details {
    display: flex;
    flex-direction: column;
}

.file-details .filename {
    font-size: 14px;
    font-weight: 500;
    color: #ffffff;
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-details .specs {
    font-size: 11px;
    color: var(--text-muted);
}

/* Morph Configuration Card */
.morph-config-card {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.morph-config-card h3 {
    font-size: 15px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    color: var(--text-secondary);
}

.checkbox-row {
    flex-direction: row-reverse;
    justify-content: flex-end;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
    margin-top: 4px;
    width: 16px;
    height: 16px;
    accent-color: var(--color-accent);
}

/* Process Button Glowing */
.btn-process-glowing {
    width: 100%;
    margin-top: 8px;
    padding: 16px;
    font-size: 17px;
    border-radius: 12px;
}

/* Playback & Visualization Panel (Bottom) */
.visualization-section {
    padding: 24px;
}

.visualization-section.hidden {
    display: none;
}

.visualizer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 20px;
}

.visualizer-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    overflow: hidden;
}

.visualizer-card.glow-card {
    border-color: rgba(0, 240, 255, 0.25);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.05);
}

.visualizer-card .card-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 500;
}

.playback-controls {
    display: flex;
    gap: 8px;
}

.btn-play {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #ffffff;
}

.btn-play:hover {
    background: #a25eff;
}

.btn-play-small {
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-play-small:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-play-glowing {
    background: var(--color-accent);
    color: #0b0c16;
    box-shadow: 0 0 8px var(--color-accent-glow);
}

.btn-play-glowing:hover {
    background: #5effff;
    box-shadow: 0 0 15px var(--color-accent);
}

.visualizer-canvas-container {
    width: 100%;
    aspect-ratio: 3/2;
    background: #05060b;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    position: relative;
    overflow: hidden;
}

.visualizer-canvas-container canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.playback-progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: rgba(0, 240, 255, 0.07);
    border-right: 1px solid var(--color-accent);
    pointer-events: none;
    z-index: 5;
}

/* Export Toolbar */
.export-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.playback-global-settings {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 24px;
}

.volume-container {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
}

.volume-container input[type="range"] {
    width: 100px;
}

.volume-container span {
    font-size: 13px;
    font-family: var(--font-heading);
    color: var(--text-primary);
    width: 35px;
}

.loop-container {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
}

.loop-container input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-accent);
}

.loop-container label {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

/* Footer styling */
.app-footer {
    text-align: center;
    padding: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 20px;
}