/* ===== VARIABLES CSS ===== */
:root {
    /* Couleurs principales */
    --color-primary: #c94e1f;
    --color-primary-light: #e6682f;
    --color-primary-dark: #a03a16;
    --color-accent: #ff6b35;
    --color-accent-hover: #ff5722;
    --color-success: #2ecc71;
    --color-danger: #e74c3c;
    --color-danger-hover: #c0392b;

    /* Couleurs de fond */
    --color-bg: #f5f7fa;
    --color-bg-card: #ffffff;
    --color-bg-hover: #f8f9fa;

    /* Texte */
    --color-text: #2c3e50;
    --color-text-light: #6c757d;
    --color-text-muted: #95a5a6;

    /* Bordures et séparateurs */
    --color-border: #dee2e6;
    --color-border-light: #e9ecef;

    /* Typographie */
    --font-ui: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Space Mono', 'Courier New', monospace;

    /* Espacements */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Rayons de bordure */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Ombres */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

body {
    font-family: var(--font-ui);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== HEADER STATS ===== */
.stats-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
    animation: slideDown 0.4s ease;
    transition: all var(--transition-base);
}

.stats-header.hidden {
    display: none;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.stats-header .container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.app-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.active-filters {
    font-size: 0.8rem;
    font-weight: 400;
    opacity: 0.85;
    margin-top: var(--spacing-xs);
    font-family: var(--font-mono);
    letter-spacing: 0.01em;
}

.app-title::before {
    content: '✈';
    font-size: 2rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform var(--transition-base), background var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.15);
}

.stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.9;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ===== NAVIGATION ONGLETS ===== */
.tabs-nav {
    background: white;
    border-bottom: 2px solid var(--color-border-light);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 96px;
    z-index: 90;
    transition: top var(--transition-base);
}

.stats-header.hidden ~ .tabs-nav {
    top: 0;
}

.tabs-nav .container {
    display: flex;
    gap: var(--spacing-xs);
    padding-top: var(--spacing-sm);
}

.tab-btn {
    background: none;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    font-family: var(--font-ui);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-light);
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: color var(--transition-base);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.tab-btn:hover {
    color: var(--color-primary);
    background: var(--color-bg-hover);
}

.tab-btn.active {
    color: var(--color-primary);
    font-weight: 600;
}

.tab-btn.active::after {
    transform: scaleX(1);
}

.tab-icon {
    font-size: 1.25rem;
    line-height: 1;
}

/* ===== CONTENU ONGLETS ===== */
main {
    flex: 1;
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-2xl);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

/* ===== FILTRES ===== */
.filters-section {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

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

.filter-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.filter-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-ui);
    font-size: 0.95rem;
    color: var(--color-text);
    background: white;
    cursor: pointer;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.filter-select:hover {
    border-color: var(--color-primary-light);
}

.filter-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(201, 78, 31, 0.1);
}

.filter-chips {
    display: flex;
    gap: var(--spacing-sm);
}

.chip {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: white;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.chip.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* ===== TABLE ===== */
.table-container {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

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

.flights-table thead {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
}

.flights-table th {
    padding: var(--spacing-md) var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.flights-table tbody tr {
    border-bottom: 1px solid var(--color-border-light);
    transition: background var(--transition-fast);
}

.flights-table tbody tr:hover {
    background: var(--color-bg-hover);
}

.flights-table tbody tr:last-child {
    border-bottom: none;
}

.flights-table td {
    padding: var(--spacing-md) var(--spacing-md);
    font-size: 0.95rem;
    color: var(--color-text);
}

.flights-table td[data-label="Temps"],
.flights-table td[data-label="Appareil"],
.flights-table td[data-label="Départ"],
.flights-table td[data-label="Arrivée"] {
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.flights-table td[data-label="Date"] {
    font-weight: 500;
}

.flights-table td[data-label="Instructeur"] {
    font-weight: 600;
}

/* ===== FORMULAIRES ===== */
.form-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border-light);
}

.flight-form,
.ref-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.form-input,
.form-select,
.form-textarea {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-ui);
    font-size: 0.95rem;
    color: var(--color-text);
    background: white;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
    border-color: var(--color-primary-light);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(201, 78, 31, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 60px;
}

.checkbox-group {
    margin-top: 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background var(--transition-base);
}

.checkbox-label:hover {
    background: var(--color-bg-hover);
}

.form-checkbox {
    width: 1.1rem;
    height: 1.1rem;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.checkbox-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

/* ===== BOUTONS ===== */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-ui);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

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

.btn-primary:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background: var(--color-text-light);
    color: white;
}

.delete-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-danger);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-ui);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.delete-btn:hover {
    background: var(--color-danger-hover);
    transform: scale(1.05);
}

/* ===== GRILLE RÉFÉRENTIELS ===== */
.referentiels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .stats-header .container {
        gap: var(--spacing-sm);
    }

    .header-top {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .app-title {
        font-size: 1.5rem;
    }

    .active-filters {
        font-size: 0.7rem;
    }

    .stats-grid {
        width: 100%;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }

    .stat-card {
        padding: var(--spacing-sm);
    }

    .stat-label {
        font-size: 0.65rem;
    }

    .stat-value {
        font-size: 1.1rem;
    }

    .tabs-nav {
        top: 144px;
    }

    .stats-header.hidden ~ .tabs-nav {
        top: 0;
    }

    .tabs-nav .container {
        padding-left: 0;
        padding-right: 0;
    }

    .tab-btn {
        flex: 1;
        justify-content: center;
        padding: var(--spacing-md) var(--spacing-sm);
        font-size: 0.85rem;
    }

    .tab-label {
        display: none;
    }

    .tab-icon {
        font-size: 1.5rem;
    }

    .filters-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .filter-chips {
        width: 100%;
    }

    .chip {
        flex: 1;
        text-align: center;
    }

    .table-container {
        overflow-x: auto;
    }

    .flights-table {
        display: block;
    }

    .flights-table thead {
        display: none;
    }

    .flights-table tbody {
        display: block;
    }

    .flights-table tbody tr {
        display: block;
        margin-bottom: var(--spacing-lg);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        overflow: hidden;
    }

    .flights-table tbody tr:hover {
        background: white;
        box-shadow: var(--shadow-md);
    }

    .flights-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border-light);
    }

    .flights-table td:last-child {
        border-bottom: none;
    }

    .flights-table td::before {
        content: attr(data-label);
        font-weight: 600;
        font-size: 0.75rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--color-text-light);
    }

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

    .form-title {
        font-size: 1.1rem;
        margin-bottom: var(--spacing-sm);
    }

    .flight-form {
        gap: var(--spacing-sm);
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .form-row-keep {
        grid-template-columns: 1fr 1fr !important;
    }

    .form-label {
        font-size: 0.7rem;
    }

    .form-input,
    .form-select,
    .form-textarea {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }

    .form-textarea {
        min-height: 50px;
    }

    .checkbox-label {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .checkbox-text {
        font-size: 0.8rem;
    }

    .form-actions {
        flex-direction: column;
        gap: var(--spacing-xs);
        margin-top: 0;
    }

    .btn {
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .referentiels-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .stats-header {
        padding: var(--spacing-md) 0;
    }

    .app-title {
        font-size: 1.25rem;
    }

    .form-card {
        padding: var(--spacing-sm);
    }

    main {
        padding-top: var(--spacing-md);
        padding-bottom: var(--spacing-lg);
    }
}