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

:root {
    --primary: #1e40af;
    --primary-dark: #1e3a8a;
    --primary-light: #3b82f6;
    
    --bg-main: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #334155;
    --bg-hover: #475569;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --border: #475569;
    --border-light: #64748b;
    
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.4);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
}

.admin-container {
    display: flex;
    min-height: 100vh;
}

/* SIDEBAR */
.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    transition: all 0.3s;
    z-index: 100;
}

.sidebar.collapsed {
    width: 70px;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.sidebar-header p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.sidebar.collapsed .sidebar-header h2,
.sidebar.collapsed .sidebar-header p {
    display: none;
}

.sidebar-menu {
    list-style: none;
    padding: 16px 12px;
    flex: 1;
}

.menu-item {
    margin-bottom: 4px;
}

.menu-item a {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.95rem;
    font-weight: 500;
}

.menu-item a i {
    width: 20px;
    margin-right: 12px;
    font-size: 1.1rem;
}

.sidebar.collapsed .menu-item a span {
    display: none;
}

.sidebar.collapsed .menu-item a i {
    margin-right: 0;
}

.menu-item a:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.menu-item.active a {
    background: var(--primary);
    color: white;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
    background: var(--bg-main);
}

.system-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
}

.server-time {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* MAIN CONTENT */
.main-content {
    flex: 1;
    margin-left: 260px;
    transition: margin-left 0.3s;
}

.sidebar.collapsed ~ .main-content {
    margin-left: 70px;
}

/* HEADER */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 16px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.toggle-sidebar {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s;
}

.toggle-sidebar:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--bg-hover);
}

.user-profile img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--primary);
}

.user-profile span {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* CONTENT */
.content {
    padding: 32px;
}

/* NAVIGATION GRID */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 1400px;
}

.nav-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px;
    text-decoration: none;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.nav-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.nav-icon {
    width: 80px;
    height: 80px;
    border-radius: 12px;
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-light);
    margin-bottom: 20px;
}

.nav-card:hover .nav-icon {
    background: var(--primary);
    color: white;
}

.nav-card h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 600;
}

.nav-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* TABLE CONTAINER */
.table-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.table-header {
    padding: 24px 32px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.table-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-main);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 16px;
}

.search-box i {
    color: var(--text-muted);
    margin-right: 8px;
}

.search-input {
    background: none;
    border: none;
    color: var(--text-primary);
    outline: none;
    width: 200px;
    font-size: 0.9rem;
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

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

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

.btn-cancel {
    background: var(--bg-hover);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-cancel:hover {
    background: var(--bg-card);
}

/* TABLE */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background: var(--bg-main);
    padding: 16px 24px;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

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

.action-buttons {
    display: flex;
    gap: 8px;
}

/* MODAL */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s;
}

.modal.show {
    opacity: 1;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--danger);
    color: white;
}

.modal form {
    padding: 24px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-main);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    margin-top: 20px;
}

/* NOTIFICATION */
.notification {
    position: fixed;
    top: 24px;
    right: 24px;
    padding: 16px 24px;
    border-radius: 6px;
    color: white;
    font-weight: 600;
    z-index: 2000;
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: transform 0.3s;
    display: flex;
    align-items: center;
    gap: 12px;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    background: var(--success);
}

.notification.error {
    background: var(--danger);
}

.notification.warning {
    background: var(--warning);
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }
    
    .sidebar .menu-item a span {
        display: none;
    }
    
    .main-content {
        margin-left: 70px;
    }
    
    .content {
        padding: 16px;
    }
    
    .header {
        padding: 12px 16px;
    }
    
    .header h1 {
        font-size: 1.2rem;
    }
    
    .table-header {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }
    
    .nav-grid {
        grid-template-columns: 1fr;
    }
}