/* Variables CSS */
:root {
    --primary-color: #3788d8;
    --primary-dark: #2c6ab5;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --error-color: #F44336;
    --info-color: #2196F3;
    --text-color: #333;
    --text-muted: #757575;
    --border-color: #e0e0e0;
    --bg-light: #f5f5f5;
    --bg-white: #ffffff;
    --sidebar-width: 260px;
    --topbar-height: 60px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-light);
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

/* Layout principal */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-white);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 1000;
}

.sidebar-header {
    padding: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-align: center;
}

.sidebar-header i {
    font-size: 32px;
}

.sidebar-header h1 {
    font-size: 18px;
    margin-top: 10px;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: var(--text-color);
    transition: all 0.3s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: var(--bg-light);
    color: var(--primary-color);
}

.nav-item.active {
    background-color: rgba(55, 136, 216, 0.1);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
}

.nav-item i {
    width: 24px;
    margin-right: 12px;
}

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
}

.top-bar {
    height: var(--topbar-height);
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
}

.content-wrapper {
    padding: 30px;
}

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

.stat-card {
    background: var(--bg-white);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    font-size: 40px;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
}

.stat-primary .stat-icon {
    background-color: rgba(55, 136, 216, 0.1);
    color: var(--primary-color);
}

.stat-success .stat-icon {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
}

.stat-warning .stat-icon {
    background-color: rgba(255, 152, 0, 0.1);
    color: var(--warning-color);
}

.stat-content h3 {
    font-size: 32px;
    margin: 0;
}

.stat-content p {
    margin: 0;
    color: var(--text-muted);
}

/* Cards */
.dashboard-card, .card {
    background: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 18px;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-body {
    padding: 20px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

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

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

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
}

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

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
}

table th {
    background-color: var(--bg-light);
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

/* Login page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header i {
    font-size: 48px;
    color: var(--primary-color);
}

.alert {
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-error {
    background-color: #ffebee;
    color: #c62828;
}

.text-muted {
    color: var(--text-muted);
    font-size: 13px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
}