:root {
    --bg-body: #f4f6f9;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f9fa;
    --bg-sidebar: #f8f9fa;
    --bg-navbar: #212529;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --border-table: #f0f0f0;
    --input-bg: #ffffff;
    --input-border: #e0e0e0;
    --table-stripe: rgba(0,0,0,0.02);
    --shadow: 0 0 20px rgba(0,0,0,0.05);
    --shadow-hover: 0 4px 15px rgba(102,126,234,0.4);
}

[data-theme="dark"] {
    --bg-body: #1a1a2e;
    --bg-card: #16213e;
    --bg-card-hover: #1c2a4a;
    --bg-sidebar: #0f3460;
    --bg-navbar: #0f3460;
    --text-primary: #e4e4e4;
    --text-secondary: #a0a0a0;
    --text-muted: #888;
    --border-color: #1c2a4a;
    --border-table: #1c2a4a;
    --input-bg: #1a1a2e;
    --input-border: #2a3a5e;
    --table-stripe: rgba(255,255,255,0.02);
    --shadow: 0 0 20px rgba(0,0,0,0.3);
    --shadow-hover: 0 4px 15px rgba(102,126,234,0.6);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

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

.wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.sidebar {
    min-height: calc(100vh - 56px);
    border-right: 1px solid var(--border-color);
    background: var(--bg-sidebar);
}

.sidebar .nav-link {
    color: var(--text-primary);
    padding: 10px 15px;
    border-radius: 6px;
    margin: 2px 0;
}

.sidebar .nav-link:hover {
    background: var(--bg-card-hover);
    color: #667eea;
}

.sidebar .nav-link i {
    width: 22px;
    text-align: center;
    margin-right: 8px;
}

.card {
    background: var(--bg-card);
    border: none;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.card:hover {
    transform: translateY(-1px);
}

.card-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-table);
    border-radius: 10px 10px 0 0 !important;
    font-weight: 600;
    color: var(--text-primary);
}

.table {
    color: var(--text-primary);
}

.table th {
    border-top: none;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table-striped > tbody > tr:nth-of-type(odd) {
    background-color: var(--table-stripe);
}

.table td, .table th {
    border-color: var(--border-table);
}

.badge {
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 20px;
}

.btn {
    border-radius: 6px;
    font-weight: 500;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: #fff;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #5a6fd6 0%, #6a4192 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

.bg-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

.bg-success {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%) !important;
}

.bg-info {
    background: linear-gradient(135deg, #36d1dc 0%, #5b86e5 100%) !important;
}

.bg-warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%) !important;
}

.opacity-50 {
    opacity: 0.3;
}

.navbar {
    background: var(--bg-navbar) !important;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar-brand, .navbar .text-light {
    color: #fff !important;
}

.alert {
    border: none;
    border-radius: 10px;
}

.form-control, .form-select {
    background: var(--input-bg);
    border-radius: 8px;
    border: 1.5px solid var(--input-border);
    padding: 10px 15px;
    color: var(--text-primary);
}

.form-control:focus, .form-select:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.15);
}

.form-control::placeholder {
    color: var(--text-muted);
}

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

.list-group-item {
    background: var(--bg-card);
    border-color: var(--border-color);
    color: var(--text-primary);
}

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

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

.btn-outline-light {
    color: #fff;
    border-color: rgba(255,255,255,0.5);
}

/* Theme toggle */
.theme-toggle {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: #fff;
    border-radius: 10px;
    width: auto;
    height: 38px;
    padding: 0 14px;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s;
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.4);
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.6);
}

.theme-toggle .label {
    color: #fff;
    font-weight: 500;
}

[data-theme="dark"] .theme-toggle {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    box-shadow: 0 2px 10px rgba(240, 147, 251, 0.4);
}

[data-theme="dark"] .theme-toggle:hover {
    box-shadow: 0 4px 15px rgba(240, 147, 251, 0.6);
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    main {
        margin-left: 0 !important;
    }
    .col-md-10 {
        width: 100%;
    }
}