/**
 * Video Finishing Tool - Main Styles
 * Core layout and component styling
 */

/* CSS Variables */
:root {
    /* Colors */
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f0f23;
    --bg-surface: #252542;
    --bg-elevated: #2d2d4a;

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;

    --accent-primary: #6366f1;
    --accent-primary-hover: #818cf8;
    --accent-secondary: #22d3ee;
    --accent-success: #22c55e;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;

    --border-color: #3d3d5c;
    --border-subtle: #2a2a45;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);

    /* Layout */
    --header-height: 56px;
    --timeline-height: 280px;
    --properties-width: 280px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Header / Toolbar */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.header-left, .header-center, .header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.app-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Toolbar Buttons */
.toolbar-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toolbar-btn:hover:not(:disabled) {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
}

.toolbar-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.toolbar-btn.btn-primary {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toolbar-btn.btn-primary:hover:not(:disabled) {
    background: var(--accent-primary-hover);
    border-color: var(--accent-primary-hover);
}

.toolbar-btn svg {
    flex-shrink: 0;
}

/* Main Content Area */
.app-main {
    display: flex;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

/* Preview Section */
.preview-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--bg-tertiary);
}

.preview-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    min-height: 0;
    max-height: 45vh;
}

/* Empty State */
.preview-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl);
}

.empty-icon {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.preview-empty h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.preview-empty p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.btn-upload {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-upload:hover {
    background: var(--accent-primary-hover);
}

/* Preview Canvas */
.preview-canvas-wrapper {
    position: relative;
    max-width: 100%;
    max-height: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

#preview-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.video-pool {
    display: none;
}

/* Playback Controls */
.playback-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.control-btn:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
}

.control-btn-play {
    width: 48px;
    height: 48px;
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.control-btn-play:hover {
    background: var(--accent-primary-hover);
    border-color: var(--accent-primary-hover);
}

.time-display {
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
    font-size: 14px;
    color: var(--text-secondary);
    min-width: 120px;
    text-align: center;
}

.time-separator {
    margin: 0 var(--spacing-xs);
    color: var(--text-muted);
}

/* Modal Base Styles */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-surface);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Button Variants */
.btn-primary {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    background: var(--accent-primary-hover);
}

.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
}

.btn-delete {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--accent-danger);
    border-radius: var(--radius-md);
    color: var(--accent-danger);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: var(--spacing-md);
}

.btn-delete:hover {
    background: var(--accent-danger);
    color: var(--text-primary);
}

/* Export Modal Specifics */
.export-options {
    margin-bottom: var(--spacing-lg);
}

.export-progress {
    margin-top: var(--spacing-lg);
}

.progress-bar {
    height: 8px;
    background: var(--bg-surface);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent-primary);
    transition: width var(--transition-normal);
}

.progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--text-secondary);
}

/* Export Warning */
.export-warning {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid var(--accent-warning);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.export-warning .warning-icon {
    font-size: 16px;
    flex-shrink: 0;
}

.export-warning .warning-text {
    font-size: 13px;
    color: var(--accent-warning);
    line-height: 1.4;
}

/* Export Time Estimate */
.export-estimate {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-subtle);
}

.export-estimate #export-time-estimate {
    font-weight: 500;
    color: var(--text-primary);
}

/* Audio Modal Specifics */
.audio-type-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.audio-type-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.audio-type-btn:hover {
    border-color: var(--accent-primary);
    background: var(--bg-elevated);
}

.audio-type-btn span {
    font-size: 14px;
    font-weight: 600;
}

.audio-type-btn small {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Drag and Drop Highlight */
.app-container.drag-over .preview-empty {
    border: 2px dashed var(--accent-primary);
    border-radius: var(--radius-lg);
    background: rgba(99, 102, 241, 0.1);
}

/* Responsive Adjustments */
@media (max-width: 1024px) {
    .toolbar-btn span {
        display: none;
    }

    .toolbar-btn {
        padding: var(--spacing-sm);
    }

    :root {
        --properties-width: 240px;
    }
}

@media (max-width: 768px) {
    .properties-panel {
        display: none;
    }
}