:root {
    --sidebar-width: 250px;
    --primary: #00bcd4;
    --primary-dark: #00a5bb;
    --sidebar-bg: #0d1117;
    --sidebar-hover: #161b22;
    --body-bg: #0d1117;
    --card-bg: #161b22;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #7d8590;
    --input-bg: #0d1117;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--body-bg);
    min-height: 100vh;
    color: var(--text-primary);
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

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

.sidebar-brand h4 {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0;
}

.sidebar-brand span {
    color: var(--primary);
}

.sidebar-user {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 42px;
    height: 42px;
    background: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000;
    font-weight: 600;
    font-size: 1rem;
}

.user-info h6 {
    color: var(--text-primary);
    margin: 0;
    font-size: 0.9rem;
    font-weight: 600;
}

.user-info small {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.sidebar-nav {
    padding: 16px 12px;
    flex: 1;
    overflow-y: auto;
}

.nav-label {
    color: var(--primary);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 12px 12px 8px;
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 4px;
    transition: all 0.2s;
    font-size: 0.9rem;
}

.sidebar-nav .nav-link:hover {
    background: var(--sidebar-hover);
    color: var(--text-primary);
}

.sidebar-nav .nav-link.active {
    background: var(--primary);
    color: #000;
}

.sidebar-nav .nav-link i {
    font-size: 1.1rem;
    width: 20px;
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

.btn-logout {
    width: 100%;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-logout:hover {
    background: #dc3545;
    color: #fff;
    border-color: #dc3545;
}

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

/* Topbar */
.topbar {
    background: var(--card-bg);
    padding: 16px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar h5 {
    margin: 0;
    font-weight: 600;
    color: var(--text-primary);
}

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

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: var(--primary);
    color: #000;
    border-color: var(--primary);
}

/* Page Content */
.page-content {
    padding: 32px;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card,
.stat-card-clickable {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--border-color);
}

.stat-card-clickable {
    display: block;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s;
}

.stat-card-clickable:hover {
    border-color: var(--primary);
    background: rgba(0,188,212,0.05);
}

.stat-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-icon.blue { background: rgba(0,188,212,0.15); color: var(--primary); }
.stat-icon.green { background: rgba(25,135,84,0.15); color: #2ea043; }
.stat-icon.orange { background: rgba(253,126,20,0.15); color: #fd7e14; }
.stat-icon.red { background: rgba(220,53,69,0.15); color: #f85149; }

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Data Cards */
.data-card {
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.data-card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.data-card-header h6, .data-card-header h5, .data-card-header h4 {
    margin: 0;
    font-weight: 600;
    color: var(--primary);
}

/* Tables */
.table-responsive {
    padding: 0 24px 24px;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 14px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 16px 12px;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
}

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

tr:hover td {
    background: rgba(0,188,212,0.05);
}

code {
    background: var(--input-bg);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--primary);
    border: 1px solid var(--border-color);
}

/* Badges */
.badge {
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success { background: rgba(46,160,67,0.15); color: #2ea043; }
.badge-warning { background: rgba(253,126,20,0.15); color: #fd7e14; }
.badge-danger { background: rgba(248,81,73,0.15); color: #f85149; }
.badge-info { background: rgba(0,188,212,0.15); color: var(--primary); }
.badge-primary { background: rgba(0,188,212,0.15); color: var(--primary); }
.badge-secondary { background: rgba(125,133,144,0.15); color: var(--text-secondary); }

/* Buttons */
.btn-primary {
    background: var(--primary);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    color: #000;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: #000;
}

.btn-secondary {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-secondary:hover {
    background: var(--sidebar-hover);
    color: var(--text-primary);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.75rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-secondary);
    cursor: pointer;
    margin-right: 4px;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-sm.danger:hover {
    background: #f85149;
    color: #fff;
    border-color: #f85149;
}

.btn-outline-primary {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-outline-primary:hover {
    background: var(--primary);
    color: #000;
}

.btn-outline-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-outline-secondary:hover {
    background: var(--sidebar-hover);
    color: var(--text-primary);
}

/* Forms */
.form-control, .form-select {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 14px;
    border-radius: 8px;
    transition: all 0.2s;
}

.form-control:focus, .form-select:focus {
    background: var(--card-bg);
    border-color: var(--primary);
    color: var(--text-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0,188,212,0.1);
}

.form-label {
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 8px;
    font-size: 0.875rem;
}

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

.text-danger {
    color: #f85149 !important;
}

.text-muted {
    color: var(--text-secondary) !important;
}

/* Alerts */
.alert {
    padding: 14px 18px;
    border-radius: 8px;
    border: 1px solid;
    margin-bottom: 20px;
}

.alert-success {
    background: rgba(46,160,67,0.1);
    border-color: #2ea043;
    color: #2ea043;
}

.alert-danger {
    background: rgba(248,81,73,0.1);
    border-color: #f85149;
    color: #f85149;
}

.alert-warning {
    background: rgba(253,126,20,0.1);
    border-color: #fd7e14;
    color: #fd7e14;
}

.alert-info {
    background: rgba(0,188,212,0.1);
    border-color: var(--primary);
    color: var(--primary);
}

/* Card */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 24px;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: transparent;
    color: var(--primary);
    font-weight: 600;
}

.card-body {
    padding: 20px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .main-content {
        margin-left: 0;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .page-content {
        padding: 16px;
    }
}