:root {
    --sidebar-width: 240px;
    --sidebar-bg: #1a1a2e;
    --sidebar-text: #a0a0b0;
    --sidebar-active: #4f46e5;
    --sidebar-hover: rgba(79, 70, 229, 0.1);
    --topbar-height: 60px;
    --body-bg: #f8f9fc;
    --card-bg: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
}

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

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--sidebar-bg);
    position: fixed;
    left: 0;
    top: 0;
    display: flex;
    flex-direction: column;
    z-index: 1000;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 1.25rem;
    font-weight: 600;
}

.brand-icon {
    font-size: 1.5rem;
}

.sidebar-nav {
    flex: 1;
    padding: 15px 0;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.nav-section {
    padding: 0 12px;
    margin-bottom: 10px;
}

.nav-section-title {
    color: var(--sidebar-text);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 10px 12px 5px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 6px;
    margin-bottom: 2px;
    transition: all 0.15s ease;
}

.nav-item:hover {
    background-color: var(--sidebar-hover);
    color: #fff;
}

.nav-item.active {
    background-color: var(--sidebar-active);
    color: #fff;
}

.nav-icon {
    font-size: 1rem;
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    min-height: 100vh;
}

/* Topbar */
.topbar {
    height: var(--topbar-height);
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.user-info {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Page Content */
.page-content {
    padding: 30px;
}

/* Page Header */
.page-header {
    margin-bottom: 30px;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.page-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 15px 20px;
}

.card-body {
    padding: 20px;
}

/* Tables */
.table-container {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.table {
    margin-bottom: 0;
}

.table thead th {
    background-color: #f9fafb;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 12px 16px;
}

.table tbody td {
    padding: 16px;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-color);
}

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

.table tbody tr:hover {
    background-color: #f9fafb;
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 15px;
}

.toolbar-left {
    flex: 1;
    max-width: 400px;
}

.toolbar-right {
    display: flex;
    gap: 10px;
}

/* Search Input */
.search-input {
    position: relative;
}

.search-input input {
    padding-left: 40px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    height: 40px;
}

.search-input .search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

/* Buttons */
.btn-primary {
    background-color: var(--sidebar-active);
    border-color: var(--sidebar-active);
}

.btn-primary:hover {
    background-color: #4338ca;
    border-color: #4338ca;
}

.btn-outline-secondary {
    border-color: var(--border-color);
    color: var(--text-secondary);
}

/* Status Badges */
.badge-success {
    background-color: #10b981;
    color: #fff;
}

.badge-warning {
    background-color: #f59e0b;
    color: #fff;
}

.badge-danger {
    background-color: #ef4444;
    color: #fff;
}

.badge-info {
    background-color: #3b82f6;
    color: #fff;
}

/* ID Column */
.id-cell {
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.id-cell .copy-btn {
    opacity: 0;
    transition: opacity 0.15s;
    cursor: pointer;
    margin-left: 5px;
}

.id-cell:hover .copy-btn {
    opacity: 1;
}

/* Forms */
.form-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-control, .form-select {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px 14px;
}

.form-control:focus, .form-select:focus {
    border-color: var(--sidebar-active);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-text {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
}

.stat-card-title {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.stat-card-value {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-card-change {
    font-size: 0.8rem;
    margin-top: 5px;
}

.stat-card-change.positive {
    color: #10b981;
}

.stat-card-change.negative {
    color: #ef4444;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.empty-state-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--sidebar-bg);
}

.login-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

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

.login-logo {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.login-title {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Dropdown Menu */
.dropdown-menu {
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-radius: 6px;
}

.dropdown-item {
    padding: 8px 16px;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 60px;