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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;
    --text-dark: #1e293b;
    --text-light: #64748b;
}

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

.container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background: var(--dark-bg);
    color: white;
    padding: 20px;
    overflow-y: auto;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.logo {
    margin-bottom: 40px;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 20px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.menu {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    color: #cbd5e1;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border-left: 3px solid transparent;
}

.menu-item:hover {
    background: rgba(37, 99, 235, 0.1);
    color: white;
    border-left-color: var(--primary-color);
}

.menu-item.active {
    background: rgba(37, 99, 235, 0.2);
    color: white;
    border-left-color: var(--primary-color);
}

.menu-item.logout {
    margin-top: auto;
    color: #ef4444;
}

.menu-item .icon {
    font-size: 18px;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header {
    background: white;
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    background: var(--light-bg);
    border-radius: 8px;
}

.content {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

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

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    border-left: 4px solid var(--primary-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
    font-weight: 500;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.page-header h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.data-table thead {
    background: var(--light-bg);
    border-bottom: 2px solid var(--border-color);
}

.data-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--text-dark);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-dark);
}

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

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

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

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

/* Status Badge */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: slideUp 0.3s ease;
}

.login-modal {
    max-width: 400px;
}

.modal-content h3,
.modal-content h2 {
    margin-bottom: 20px;
    color: var(--text-dark);
}

.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.modal-content input,
.modal-content select,
.modal-content textarea {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.modal-content input:focus,
.modal-content select:focus,
.modal-content textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-light);
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--text-dark);
}

/* Error Message */
.error-message {
    color: var(--danger-color);
    font-size: 14px;
    margin-top: 10px;
    padding: 10px;
    background: #fee2e2;
    border-radius: 8px;
    display: none;
}

.error-message.show {
    display: block;
}

/* Loading */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .menu {
        flex-direction: row;
        gap: 5px;
    }

    .menu-item {
        padding: 8px 12px;
        font-size: 12px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .data-table {
        font-size: 12px;
    }

    .data-table th,
    .data-table td {
        padding: 10px;
    }

    .page-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
}