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

:root {
    --gold: #FFD700;
    --gold-dark: #FFA500;
    --gold-light: #FFED4E;
    --dark: #1a1a1a;
    --gray: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--dark);
}

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

.card {
    background: var(--white);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    animation: fadeIn 0.5s ease;
}

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

.header {
    text-align: center;
    margin-bottom: 40px;
}

.header h1 {
    font-size: 2.5em;
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.header p {
    color: #666;
    font-size: 1.1em;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 4px rgba(255, 215, 0, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.btn {
    padding: 15px 40px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    color: var(--dark);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(255, 215, 0, 0.3);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-left: 4px solid #28a745;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-left: 4px solid #dc3545;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border-left: 4px solid #17a2b8;
}

.calendar-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin: 30px 0;
}

.calendar-day {
    background: var(--gray);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.calendar-day:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.calendar-day.selected {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    color: var(--dark);
    border-color: var(--gold-dark);
    font-weight: 600;
}

.calendar-day.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.time-slots {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 15px;
    margin: 30px 0;
}

.time-slot {
    background: var(--gray);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    font-weight: 600;
}

.time-slot:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.time-slot.selected {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    color: var(--dark);
    border-color: var(--gold-dark);
}

.time-slot.disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background: #e0e0e0;
}

.meet-info {
    background: linear-gradient(135deg, var(--gold-light), var(--gold));
    padding: 30px;
    border-radius: 15px;
    margin: 30px 0;
}

.meet-info h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.meet-info p {
    margin: 10px 0;
    color: var(--dark);
    font-size: 1.05em;
}

.meet-info a {
    color: var(--dark);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 2px solid var(--dark);
}

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

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

thead {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
}

th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
}

td {
    padding: 15px;
    border-bottom: 1px solid #e0e0e0;
}

tbody tr {
    transition: background 0.3s ease;
}

tbody tr:hover {
    background: var(--gray);
}

.badge {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.badge-info {
    background: #d1ecf1;
    color: #0c5460;
}

.actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.login-container {
    max-width: 450px;
    margin: 100px auto;
}

.logout-btn {
    position: absolute;
    top: 20px;
    right: 20px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    padding: 30px;
    border-radius: 15px;
    color: var(--dark);
    text-align: center;
}

.stat-card h3 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.stat-card p {
    font-size: 1.1em;
    font-weight: 600;
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--gold);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

@media (max-width: 768px) {
    .card {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 1.8em;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .calendar-container {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .time-slots {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    table {
        font-size: 0.9em;
    }
    
    th, td {
        padding: 10px;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .actions .btn {
        width: 100%;
    }
}

.footer {
    text-align: center;
    padding: 20px;
    color: white;
    margin-top: 40px;
}

.footer a {
    color: var(--gold);
    text-decoration: none;
}

/* Styles pour les messages de validation */
.invalid-feedback {
    color: #dc3545;
    font-size: 0.875em;
    margin-top: 5px;
    display: none;
}

.form-group.invalid input,
.form-group.invalid select {
    border-color: #dc3545;
}

.form-group.invalid .invalid-feedback {
    display: block;
}