/* ==========================================
   VARIABLES ET THÈMES
   ========================================== */

:root {
    /* Palette professionnelle - Light Mode */
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f4f4f5;
    --bg-card: #ffffff;
    --bg-hover: #f4f4f5;
    --bg-code: #f8f8f8;

    --text-primary: #18181b;
    --text-secondary: #71717a;
    --text-tertiary: #a1a1aa;

    --border-color: #e4e4e7;
    --border-hover: #d4d4d8;

    --accent-primary: #6366f1;
    --accent-secondary: #4f46e5;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #18181b;
    --bg-tertiary: #27272a;
    --bg-card: #18181b;
    --bg-hover: #27272a;
    --bg-code: #1c1c1f;

    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;

    --border-color: #27272a;
    --border-hover: #3f3f46;

    --accent-primary: #818cf8;
    --accent-secondary: #6366f1;
    --accent-success: #34d399;
    --accent-warning: #fbbf24;
    --accent-danger: #f87171;

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
}

/* ==========================================
   RESET ET BASE
   ========================================== */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

@media (min-width: 1600px) {
    .container {
        max-width: 1400px;
    }
}

/* ==========================================
   HEADER
   ========================================== */

.main-header {
    background: var(--gradient-primary);
    color: white;
    padding: 0.75rem 0;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.header-text {
    flex: 1;
}

.main-header h1 {
    font-size: 1.5rem;
    margin-bottom: 0;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.main-header .subtitle {
    font-size: 0.8125rem;
    opacity: 0.8;
    font-weight: 400;
    margin-top: 0.125rem;
}

.theme-toggle {
    flex-shrink: 0;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.8125rem;
    font-weight: 500;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.3);
}

/* ==========================================
   NAVIGATION
   ========================================== */

.main-nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    padding: 0.75rem 0;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 0.875rem;
    border: 1px solid transparent;
}

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

.nav-link.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

/* ==========================================
   CONTENT PRINCIPAL
   ========================================== */

.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 280px);
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

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

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

.content-section h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.content-section h3 {
    font-size: 1.125rem;
    margin: 1rem 0 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* ==========================================
   GRILLES ET LAYOUTS
   ========================================== */

.playground-grid,
.lab-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: minmax(260px, 320px) 1fr;
}

.playground-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.full-width {
    grid-column: 1 / -1;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
}

/* ==========================================
   PANNEAUX DE CONTRÔLE
   ========================================== */

.control-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.control-group {
    margin-bottom: 1.25rem;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.control-group input[type="range"] {
    width: 100%;
    height: 10px;
    border-radius: 5px;
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--accent-secondary);
    transform: scale(1.15);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.control-group input[type="range"]::-moz-range-thumb:hover {
    background: var(--accent-secondary);
    transform: scale(1.15);
}

.control-group select {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.control-group select:hover {
    border-color: var(--border-hover);
    background: var(--bg-hover);
}

.control-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Checkbox styles */
.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    margin-bottom: 0.25rem !important;
}

.checkbox-label input[type="checkbox"] {
    width: 44px;
    height: 24px;
    appearance: none;
    -webkit-appearance: none;
    background: var(--bg-tertiary);
    border-radius: 12px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid var(--border-color);
    flex-shrink: 0;
}

.checkbox-label input[type="checkbox"]::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--text-secondary);
    top: 1px;
    left: 1px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.checkbox-label input[type="checkbox"]:checked {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.checkbox-label input[type="checkbox"]:checked::before {
    left: 21px;
    background: white;
}

.checkbox-label input[type="checkbox"]:hover {
    border-color: var(--accent-primary);
}

.checkbox-text {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    user-select: none;
}

.help-text {
    margin: 0.375rem 0 0 0;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.4;
}

/* ==========================================
   BOUTONS
   ========================================== */

.button-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary,
.btn-tiny {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    flex: 1;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--accent-secondary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    flex: 1;
}

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

.quick-values {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.btn-tiny {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    flex: 1;
}

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

/* ==========================================
   VISUALISATION
   ========================================== */

.visualization-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

canvas {
    display: block;
    border-radius: var(--radius-md);
    background: var(--bg-card);
}

.responsive-canvas {
    /* Les dimensions sont gérées dynamiquement en JS avec DPR */
}

/* ==========================================
   STATISTIQUES
   ========================================== */

.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.875rem;
}

.stat-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
    transition: all 0.2s ease;
}

.stat-box:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.stat-value {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-box.warning .stat-value {
    color: var(--accent-warning);
}

.stat-box.danger .stat-value {
    color: var(--accent-danger);
}

/* ==========================================
   INFO BOXES
   ========================================== */

.info-box,
.warning-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-top: 1.25rem;
}

.warning-box {
    border-left: 3px solid var(--accent-warning);
    background: var(--bg-tertiary);
}

.info-box h4,
.warning-box h4 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
}

.formula-display {
    background: var(--bg-code);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    margin: 0.75rem 0;
    border: 1px solid var(--border-color);
}

.result-display {
    margin-top: 1rem;
}

.result-display > div {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-display > div:last-child {
    border-bottom: none;
}

.status-ok {
    color: var(--accent-success);
    font-weight: 700;
}

.status-warning {
    color: var(--accent-warning);
    font-weight: 700;
}

.status-error {
    color: var(--accent-danger);
    font-weight: 700;
}

/* ==========================================
   CALCULATEURS
   ========================================== */

.calc-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.calc-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.result-box {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-top: 1.25rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item.big {
    font-size: 1.2rem;
    padding: 1rem 0;
}

.result-item span {
    color: var(--text-secondary);
}

.result-item strong {
    color: var(--accent-primary);
    font-size: 1.1rem;
}

.calc-result > div {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.calc-result > div:last-child {
    border-bottom: none;
}

/* ==========================================
   LEVEL METERS
   ========================================== */

.level-meters {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.level-meter {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.meter-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.meter-bar {
    height: 30px;
    background: var(--bg-tertiary);
    border-radius: 15px;
    overflow: hidden;
    border: 2px solid var(--border-color);
}

.meter-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-success), var(--accent-primary));
    transition: width 0.2s ease;
    border-radius: 13px;
}

.meter-value {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: right;
}

.pan-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ==========================================
   FORMAT CARDS
   ========================================== */

.format-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    transition: all 0.2s ease;
    cursor: pointer;
}

.format-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.format-card h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.format-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.format-badge.lossless {
    background: var(--accent-success);
    color: white;
}

.format-badge.lossy {
    background: var(--accent-warning);
    color: white;
}

.format-stats > div {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.format-stats > div:last-child {
    border-bottom: none;
}

/* ==========================================
   FOOTER
   ========================================== */

.main-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 0;
    margin-top: 3rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ==========================================
   RESPONSIVE
   ========================================== */

/* Small laptops 13" (1280px-1366px) - Optimisation critique */
@media (max-width: 1366px) {
    .container {
        max-width: 100%;
        padding: 0 1.25rem;
    }

    .main-header {
        padding: 0.625rem 0;
    }

    .main-header h1 {
        font-size: 1.375rem;
    }

    .playground-grid,
    .lab-grid {
        gap: 1.25rem;
        grid-template-columns: minmax(240px, 280px) 1fr;
    }

    .control-panel,
    .visualization-panel {
        padding: 1rem;
    }

    .stats-panel {
        gap: 0.75rem;
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
}

/* Tablets landscape (1024px) */
@media (max-width: 1024px) {
    .container {
        padding: 0 1rem;
    }

    .main-header {
        padding: 0.625rem 0;
    }

    .main-header h1 {
        font-size: 1.375rem;
    }

    .playground-grid,
    .lab-grid,
    .formats-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stats-panel {
        grid-template-columns: repeat(3, 1fr);
    }

    .nav-list {
        gap: 0.25rem;
    }

    .nav-link {
        padding: 0.5rem 0.875rem;
        font-size: 0.8125rem;
    }
}

/* Tablets portrait (768px) */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .main-header h1 {
        font-size: 1.25rem;
    }

    .main-header .subtitle {
        font-size: 0.75rem;
    }

    .theme-toggle {
        padding: 0.3rem 0.625rem;
        font-size: 0.75rem;
    }

    .main-content {
        padding: 1.5rem 0;
    }

    .content-section h2 {
        font-size: 1.5rem;
        margin-bottom: 1.25rem;
    }

    .nav-list {
        padding: 0.625rem 0;
    }

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

    .calculator-grid,
    .format-grid {
        grid-template-columns: 1fr;
    }

    .control-panel,
    .visualization-panel,
    .calc-card {
        padding: 1rem;
    }

    .button-group {
        gap: 0.5rem;
    }
}

/* Large phones (640px) */
@media (max-width: 640px) {
    .main-content {
        padding: 1.25rem 0;
    }

    .content-section h2 {
        font-size: 1.375rem;
    }

    .control-panel,
    .calc-card {
        padding: 0.875rem;
    }

    .format-bar-label {
        min-width: 90px;
        font-size: 0.75rem;
    }
}

/* Small phones (480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }

    .main-header {
        padding: 0.625rem 0;
    }

    .main-header h1 {
        font-size: 1.125rem;
    }

    .main-header .subtitle {
        font-size: 0.6875rem;
    }

    .theme-toggle {
        padding: 0.25rem 0.5rem;
        font-size: 0.6875rem;
    }

    .stats-panel {
        grid-template-columns: 1fr;
    }

    .control-panel,
    .calc-card {
        padding: 0.75rem;
    }

    .control-group {
        margin-bottom: 1rem;
    }

    .btn-primary,
    .btn-secondary,
    .btn-tiny {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    .format-bar-label {
        min-width: 70px;
        font-size: 0.6875rem;
    }

    .format-bar-wrapper {
        height: 32px;
    }
}

/* ==========================================
   FORMAT COMPARISON
   ========================================== */

.formats-container {
    display: grid;
    grid-template-columns: minmax(280px, 350px) 1fr;
    gap: 1.5rem;
}

.formats-sidebar {
    /* Colonne gauche - Configuration */
}

.formats-main {
    /* Colonne droite - Visualisations */
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.formats-visualization {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.formats-visualization h3 {
    margin: 0 0 1.25rem 0;
    color: var(--text-primary);
    font-size: 1rem;
}

.formats-bars-container {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.format-bar-item {
    display: flex;
    align-items: center;
    gap: 0.875rem;
}

.format-bar-label {
    min-width: 110px;
    font-weight: 600;
    font-size: 0.8125rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.format-bar-wrapper {
    flex: 1;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.format-bar-fill {
    height: 100%;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    padding: 0 0.875rem;
    color: white;
    font-weight: 600;
    font-size: 0.8125rem;
    transition: width 0.3s ease;
    position: relative;
}

.format-bar-text {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    font-size: 0.8125rem;
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    white-space: nowrap;
}

.format-bar-savings {
    min-width: 70px;
    text-align: right;
    font-weight: 600;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.format-badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.format-badge.lossless {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-success);
    border: 1px solid var(--accent-success);
}

.format-badge.lossy {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-warning);
    border: 1px solid var(--accent-warning);
}

.formats-table-section {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.formats-table-section h3 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
    font-size: 1rem;
}

.format-comparison-table {
    overflow-x: auto;
    margin-top: 0;
}

.format-comparison-table table {
    width: 100%;
    border-collapse: collapse;
}

.format-comparison-table th,
.format-comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.format-comparison-table th {
    font-weight: 600;
    background: var(--bg-hover);
    color: var(--text-primary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.format-comparison-table td {
    color: var(--text-secondary);
    font-size: 14px;
}

.format-comparison-table tbody tr {
    transition: background 0.2s;
}

.format-comparison-table tbody tr:hover {
    background: var(--bg-hover);
}

.format-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 15px;
}

.format-type-lossless {
    color: var(--success-color);
    font-weight: 600;
}

.format-type-lossy {
    color: var(--warning-color);
    font-weight: 600;
}

.format-size {
    font-weight: 600;
    color: var(--text-primary);
}

.format-savings {
    color: var(--success-color);
    font-weight: 600;
}

.format-usage {
    font-size: 12px;
    color: var(--text-secondary);
    font-style: italic;
}

/* ==========================================
   CHANNELS LAB
   ========================================== */

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-item span {
    color: var(--text-secondary);
}

.stat-item strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* ==========================================
   TOOLTIPS & PEDAGOGIE
   ========================================== */

.tooltip-icon {
    display: inline-block;
    width: 18px;
    height: 18px;
    line-height: 18px;
    text-align: center;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 12px;
    font-weight: bold;
    cursor: help;
    margin-left: 0.5rem;
    position: relative;
}

.tooltip-icon:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-tooltip, rgba(0, 0, 0, 0.9));
    color: white;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 13px;
    font-weight: normal;
    white-space: nowrap;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tooltip-icon:hover::before {
    content: '';
    position: absolute;
    bottom: 115%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--bg-tooltip, rgba(0, 0, 0, 0.9));
    z-index: 1001;
}

.formula-display {
    background: var(--bg-hover);
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 16px;
    text-align: center;
    margin: 1rem 0;
    border-left: 4px solid var(--primary-color);
}

.formula-display sub {
    font-size: 12px;
}

.highlight-success {
    color: var(--success-color);
    font-weight: 600;
}

.highlight-warning {
    color: var(--warning-color);
    font-weight: 600;
}

.highlight-danger {
    color: var(--danger-color);
    font-weight: 600;
}

.pedagogical-note {
    background: linear-gradient(135deg, var(--bg-hover), var(--bg-card));
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.6;
}

.pedagogical-note strong {
    color: var(--primary-color);
}

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 14px;
}

.status-indicator.ok {
    background: rgba(63, 185, 80, 0.1);
    color: var(--success-color);
}

.status-indicator.warning {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.status-indicator.error {
    background: rgba(248, 81, 73, 0.1);
    color: var(--danger-color);
}

/* ==========================================
   UTILITAIRES
   ========================================== */

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }