/* ============================================================================
   Video Trimmer Pro - Design System Softwatools
   ============================================================================ */

:root {
    /* Colores Principales */
    --primary: #FF6E00;
    --primary-dark: #E55A00;
    --primary-light: #FF8A33;
    --primary-rgb: 255, 110, 0;
    
    /* Colores Semánticos */
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Tema Oscuro (Default) */
    --bg-dark: #0a0e1b;
    --bg-panel: #131823;
    --bg-card: #1c2333;
    --bg-hover: #252d3d;
    
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border: #2a3441;
    --border-light: #374151;
    
    /* Mobile específico */
    --mobile-header-bg: #0f1420;
    --mobile-nav-bg: #0f1420;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.3);
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transiciones */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
    --header-height: 60px;
    --container-max: 1440px;
    
    /* Mobile */
    --mobile-header: 56px;
    --mobile-nav: 76px;
    --mobile-safe-top: env(safe-area-inset-top, 0);
    --mobile-safe-bottom: env(safe-area-inset-bottom, 0);
    
    /* Espaciado */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Tipografía */
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --font-mono: ui-monospace, 'SF Mono', 'Monaco', 'Cascadia Code', monospace;
    
    /* Z-Index */
    --z-dropdown: 10;
    --z-sticky: 20;
    --z-fixed: 30;
    --z-mobile-nav: 45;
    --z-modal-backdrop: 40;
    --z-modal: 50;
    --z-notification: 80;
}

/* Tema Claro */
[data-theme="light"] {
    --bg-dark: #ffffff;
    --bg-panel: #f8fafc;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --border: #e2e8f0;
    --border-light: #cbd5e1;
    
    --mobile-header-bg: #f1f5f9;
    --mobile-nav-bg: #f1f5f9;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-tap-highlight-color: transparent;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-dark);
    min-height: 100vh;
}

/* Layout Principal */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Desktop */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-base);
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: var(--z-fixed);
    flex-shrink: 0;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.sidebar-logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.sidebar-logo-text {
    font-weight: 700;
    font-size: 1.125rem;
    transition: opacity var(--transition-base);
}

.sidebar.collapsed .sidebar-logo-text {
    opacity: 0;
    visibility: hidden;
}

.sidebar-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-sm);
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
    scrollbar-gutter: stable;
    padding-bottom: var(--spacing-md);
}

.sidebar-footer {
    padding: var(--spacing-sm);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    background: var(--bg-panel);
}

.nav-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    user-select: none;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(var(--primary-rgb), 0.15);
    color: var(--primary);
}

.nav-icon {
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar.collapsed .nav-icon {
    margin-right: 0;
}

.nav-text {
    font-size: 0.875rem;
    font-weight: 500;
}

.sidebar.collapsed .nav-text {
    display: none;
}

.nav-badge {
    margin-left: auto;
    background: var(--primary);
    color: white;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.sidebar.collapsed .nav-badge {
    display: none;
}

/* Header Desktop */
.header {
    height: var(--header-height);
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.header-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.content-area {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: var(--container-max);
    width: 100%;
    margin: 0 auto;
}

/* Mobile Header */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--mobile-header);
    background: var(--mobile-header-bg);
    border-bottom: 1px solid var(--border);
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    z-index: var(--z-mobile-nav);
    backdrop-filter: blur(10px);
}

.mobile-header-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Mobile Bottom Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(var(--mobile-nav) + var(--mobile-safe-bottom));
    background: var(--mobile-nav-bg);
    border-top: 1px solid var(--border);
    z-index: var(--z-mobile-nav);
    backdrop-filter: blur(10px);
    padding: var(--spacing-sm) var(--spacing-sm);
    padding-bottom: calc(var(--spacing-sm) + var(--mobile-safe-bottom));
}

.mobile-nav-wrapper {
    display: flex;
    height: 100%;
    align-items: center;
    justify-content: space-around;
}

.mobile-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-xs);
    gap: 2px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    user-select: none;
    position: relative;
}

.mobile-nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 40px;
    height: 3px;
    background: var(--primary);
    border-radius: 0 0 3px 3px;
    transition: transform var(--transition-fast);
}

.mobile-nav-item.active::before {
    transform: translateX(-50%) scaleX(1);
}

.mobile-nav-item.active {
    color: var(--primary);
}

.mobile-nav-item svg {
    width: 24px;
    height: 24px;
    stroke-width: 1.5;
}

.mobile-nav-item span {
    font-size: 0.75rem;
    font-weight: 500;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: var(--radius-md);
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-fixed) - 1);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-base);
}

.card-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.card-body {
    padding: var(--spacing-md) 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 14px rgba(var(--primary-rgb), 0.25);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.35);
}

.btn-secondary {
    background: var(--bg-panel);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

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

.btn-success {
    background: var(--success);
    color: white;
}

.btn-danger {
    background: var(--error);
    color: white;
}

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

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-base);
    cursor: pointer;
    background: var(--bg-panel);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.upload-area.has-video {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.05);
}

/* Video Player */
.video-player {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.video-player video {
    width: 100%;
    border-radius: var(--radius-md);
}

/* Timeline */
.timeline-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    position: relative;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.timeline-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.timeline-track {
    position: relative;
    height: 80px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    margin: var(--spacing-md) 0;
    overflow: hidden;
    cursor: pointer;
}

.timeline-waveform {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0.3;
}

.timeline-playhead {
    position: absolute;
    width: 2px;
    height: 100%;
    background: var(--error);
    left: 0;
    cursor: ew-resize;
    z-index: 3;
}

.timeline-playhead::before {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    width: 10px;
    height: 10px;
    background: var(--error);
    border-radius: 50%;
}

.timeline-segment {
    position: absolute;
    height: 100%;
    background: rgba(var(--primary-rgb), 0.3);
    border: 2px solid var(--primary);
    border-radius: var(--radius-sm);
    cursor: move;
    z-index: 2;
    transition: background var(--transition-fast);
}

.timeline-segment.selected {
    background: rgba(var(--primary-rgb), 0.5);
    box-shadow: 0 0 0 2px var(--primary);
}

.timeline-time {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Time Controls */
.time-controls {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.time-input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.time-input-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.time-input {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: var(--bg-panel);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.time-input input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    width: 50px;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 1rem;
}

.time-input input:focus {
    outline: none;
}

.time-input:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
}

/* Segments List */
.segments-list {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    min-height: 200px;
}

.segment-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-fast);
    cursor: move;
    border: 2px solid var(--border);
}

.segment-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.segment-item.selected {
    border: 2px solid var(--primary);
    background: rgba(var(--primary-rgb), 0.1);
}

.segment-item.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.segment-number {
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    margin-right: var(--spacing-md);
    flex-shrink: 0;
}

.segment-info {
    flex: 1;
}

.segment-time {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-mono);
}

.segment-duration {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.segment-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

/* Player Controls */
.player-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg) 0;
}

.control-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
}

.control-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: scale(1.05);
}

.control-btn.play {
    width: 56px;
    height: 56px;
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.control-btn.play:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
}

.time-display {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    min-width: 140px;
    text-align: center;
    font-weight: 600;
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.stat-card {
    background: var(--bg-panel);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* Progress */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: var(--spacing-md) 0;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    width: 0%;
    transition: width var(--transition-base);
}

/* Form Elements */
.form-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-panel);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-notification);
    pointer-events: none;
}

.toast {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-top: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-xl);
    border-left: 4px solid var(--primary);
    transform: translateX(400px);
    opacity: 0;
    transition: all var(--transition-base);
    pointer-events: all;
    min-width: 300px;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--error); }
.toast.warning { border-left-color: var(--warning); }
.toast.info { border-left-color: var(--info); }

/* Tooltip */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-dark);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    z-index: var(--z-notification);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

[data-tooltip]:hover::after {
    opacity: 0.95;
}

/* Keyboard Shortcuts */
.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-panel);
    border-radius: var(--radius-md);
}

kbd {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 30px;
    text-align: center;
}

/* Utilities */
.hidden { display: none !important; }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

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

/* Responsive */
@media (max-width: 1023px) {
    .app-container {
        display: block;
    }
    
    .app-container::before {
        content: '';
        display: block;
        height: var(--mobile-header);
    }
    
    .app-container::after {
        content: '';
        display: block;
        height: calc(var(--mobile-nav) + var(--mobile-safe-bottom));
    }
    
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        z-index: var(--z-modal);
        transition: left var(--transition-base);
        height: 100vh;
        width: 260px;
    }
    
    .sidebar.mobile-open {
        left: 0;
        box-shadow: var(--shadow-xl);
    }
    
    .mobile-header {
        display: flex;
    }
    
    .mobile-nav {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .sidebar-overlay {
        display: block;
    }
    
    .header {
        display: none;
    }
    
    .content-area {
        padding: var(--spacing-md);
    }
    
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .time-controls {
        grid-template-columns: 1fr;
    }
    
    .player-controls {
        flex-wrap: wrap;
    }
    
    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: calc(var(--mobile-nav) + var(--mobile-safe-bottom) + var(--spacing-md));
    }
    
    .toast {
        min-width: auto;
    }
}

@media (max-width: 640px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .timeline-controls {
        flex-wrap: wrap;
    }
    
    .shortcuts-grid {
        grid-template-columns: 1fr;
    }
}