/* 
 * Styles principaux - Architecture modulaire
 */

/* Variables CSS */
:root {
    --primary-blue: #3b82f6;
    --primary-blue-dark: #2563eb;
    --success-green: #059669;
    --success-green-dark: #047857;
    --warning-orange: #ea580c;
    --danger-red: #dc2626;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--gray-50);
}

/* Layout principal */
.header {
    background: linear-gradient(135deg, #1e40af, var(--primary-blue));
    color: white;
    padding: 1rem 2rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.nav {
    display: flex;
    gap: 1rem;
}

.nav-btn {
    background: rgba(255,255,255,0.1);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover,
.nav-btn.active {
    background: rgba(255,255,255,0.2);
}

.container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.card {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 2rem;
}

/* Stats grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-blue), #1d4ed8);
    color: white;
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.stat-card.green {
    background: linear-gradient(135deg, var(--success-green), var(--success-green-dark));
}

.stat-card.orange {
    background: linear-gradient(135deg, var(--warning-orange), #c2410c);
}

.stat-card.purple {
    background: linear-gradient(135deg, #7c3aed, #5b21b6);
}

.stat-content {
    flex: 1;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

.stat-icon {
    font-size: 2.5rem;
    opacity: 0.7;
}

/* Loading */
.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    color: var(--gray-500);
}

.loading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--warning-orange);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--gray-200);
    border-top: 3px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Animations */
.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Sections */
.section {
    display: none;
}

.section.active {
    display: block;
}

/* ── Login overlay ───────────────────────────────────────────── */
#login-overlay {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, #1e3a8a, var(--primary-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.login-box {
    background: white;
    border-radius: 12px;
    padding: 2.5rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
    animation: modalSlideIn 0.3s ease-out;
}

.login-logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-align: center;
    margin-bottom: 0.25rem;
}

.login-title {
    font-size: 1.1rem;
    color: var(--gray-500);
    text-align: center;
    margin-bottom: 2rem;
    font-weight: 400;
}

.login-box .form-group {
    margin-bottom: 1rem;
}

.login-box .form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.375rem;
}

.login-box .form-control {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 0.95rem;
    color: var(--gray-800);
    transition: border-color 0.15s;
    box-sizing: border-box;
}

.login-box .form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.login-box .button {
    width: 100%;
    justify-content: center;
    margin: 0.75rem 0 0;
    padding: 0.75rem;
    font-size: 1rem;
}

.login-box .button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .stat-card {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .stat-icon {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}