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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-bg: #ecf0f1;
    --white: #ffffff;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #bdc3c7;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-dark);
    line-height: 1.6;
}

/* Header */
.header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo img {
    height: 50px;
    width: auto;
    object-fit: contain;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 600;
    margin: 0;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s;
    font-weight: 500;
}

.nav-menu a:hover {
    color: var(--secondary-color);
}

.btn-logout {
    background-color: var(--danger-color);
    padding: 0.5rem 1.5rem;
    border-radius: 5px;
    border: none;
    color: var(--white);
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-logout:hover {
    background-color: #c0392b;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 20px;
}

/* Cards */
.card {
    background-color: var(--white);
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.card h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

/* Dashboard */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.dashboard-card {
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.dashboard-card:hover {
    transform: translateY(-5px);
}

.dashboard-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.dashboard-card .number {
    font-size: 2.5rem;
    font-weight: bold;
}

.dashboard-card.success {
    background: linear-gradient(135deg, var(--success-color), #229954);
}

.dashboard-card.warning {
    background: linear-gradient(135deg, var(--warning-color), #e67e22);
}

.dashboard-card.danger {
    background: linear-gradient(135deg, var(--danger-color), #c0392b);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-color);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    font-weight: 500;
}

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

.btn-primary:hover {
    background-color: #2980b9;
}

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

.btn-success:hover {
    background-color: #229954;
}

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

.btn-danger:hover {
    background-color: #c0392b;
}

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

.btn-warning:hover {
    background-color: #e67e22;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

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

.table th {
    background-color: var(--primary-color);
    color: var(--white);
    font-weight: 600;
}

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

/* Messages et Alertes */
.alert {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background-color: var(--white);
    padding: 3rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

/* Badge */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

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

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

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

.badge-info {
    background-color: var(--secondary-color);
    color: var(--white);
}

/* Message List */
.message-list {
    list-style: none;
}

.message-item {
    padding: 1rem;
    border-left: 4px solid var(--secondary-color);
    margin-bottom: 1rem;
    background-color: var(--light-bg);
    border-radius: 5px;
    transition: all 0.3s;
}

.message-item:hover {
    box-shadow: var(--shadow);
    transform: translateX(5px);
}

.message-item.unread {
    border-left-color: var(--warning-color);
    background-color: #fff8e1;
    font-weight: 500;
}

.message-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.message-sender {
    font-weight: 600;
    color: var(--primary-color);
}

.message-date {
    color: var(--text-light);
    font-size: 0.9rem;
}

.message-subject {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Prévisualisation des fichiers au survol */
.file-preview-container {
    position: relative;
    display: inline-block;
    cursor: pointer;
}

.file-preview {
    display: none;
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-left: 20px;
    background: white;
    border: 2px solid var(--secondary-color);
    border-radius: 10px;
    padding: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    min-width: 300px;
    max-width: 500px;
}

.file-preview-container:hover .file-preview {
    display: block;
    animation: fadeInPreview 0.2s ease-in;
}

.file-preview img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 5px;
    display: block;
}

.file-preview iframe {
    width: 100%;
    height: 400px;
    border: none;
    border-radius: 5px;
}

.file-preview-header {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--primary-color);
    font-size: 0.9rem;
}

.file-name-link {
    color: var(--secondary-color);
    text-decoration: underline;
    cursor: pointer;
    transition: color 0.3s;
}

.file-name-link:hover {
    color: #2980b9;
}

@keyframes fadeInPreview {
    from {
        opacity: 0;
        transform: translateY(-50%) translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(-50%) translateX(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu ul {
        flex-direction: column;
        gap: 1rem;
    }

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

    .table {
        font-size: 0.9rem;
    }

    .table th,
    .table td {
        padding: 0.5rem;
    }
    
    /* Adapter la preview sur mobile */
    .file-preview {
        left: 50%;
        top: auto;
        bottom: 100%;
        transform: translateX(-50%);
        margin-left: 0;
        margin-bottom: 10px;
        max-width: 90vw;
    }
    
    .file-preview-container:hover .file-preview {
        transform: translateX(-50%);
    }
}