/* ===== ROOT VARIABLES ===== */
:root {
    /* Light theme (mặc định) */
    --bg-primary: #f0f2f5;
    --bg-secondary: #ffffff;
    --bg-sidebar: #1a1a2e;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888aa;
    --border-color: #e0e0e8;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --primary: #4f8cff;
    --primary-hover: #3a7aee;
    --success: #34d399;
    --danger: #ef4444;
    --warning: #fbbf24;
    --sidebar-width: 260px;
    --header-height: 64px;
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme */
[data-theme="dark"] {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-sidebar: #0f1420;
    --bg-card: #1a2332;
    --text-primary: #e8edf5;
    --text-secondary: #b0b8c8;
    --text-muted: #6b7a8a;
    --border-color: #1e2a3a;
    --shadow: 0 2px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
}

/* ===== GLOBAL ===== */
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    padding-left: var(--sidebar-width);
}

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

.sidebar-brand {
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: var(--header-height);
}

.sidebar-brand .logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
}

.sidebar-brand h1 {
    font-size: 20px;
    font-weight: 800;
    color: #fff;
}

.sidebar-brand h1 span {
    color: var(--primary);
}

.sidebar-nav {
    flex: 1;
    padding: 12px 0;
}

.sidebar-nav .nav-section {
    padding: 8px 16px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    border-left: 3px solid transparent;
    cursor: pointer;
}

.sidebar-nav a:hover {
    background: rgba(255,255,255,0.05);
    color: #fff;
}

.sidebar-nav a.active {
    background: rgba(79, 140, 255, 0.12);
    color: var(--primary);
    border-left-color: var(--primary);
}

.sidebar-nav a .icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.sidebar-nav a .badge {
    margin-left: auto;
    background: var(--danger);
    color: #fff;
    font-size: 11px;
    padding: 2px 10px;
    border-radius: 12px;
    font-weight: 600;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-footer .user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.sidebar-footer .user-info:hover {
    background: rgba(255,255,255,0.05);
}

.sidebar-footer .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
}

.sidebar-footer .user-details {
    flex: 1;
    min-width: 0;
}

.sidebar-footer .user-details .name {
    font-size: 14px;
    font-weight: 600;
    color: #fff;
}

.sidebar-footer .user-details .balance {
    font-size: 12px;
    color: var(--success);
}

/* Sidebar toggle */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 1001;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 20px;
    transition: var(--transition);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    padding: 24px 32px;
    max-width: 1200px;
    margin: 0 auto;
}

/* ===== HEADER ===== */
.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.content-header h2 {
    font-size: 24px;
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.header-actions .theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 18px;
    transition: var(--transition);
}

.header-actions .theme-toggle:hover {
    border-color: var(--primary);
}

/* ===== HIDE SECTIONS ===== */
.section-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== CARDS ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

/* ===== STATS GRID ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card .number {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
}

.stat-card .label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== TABLES ===== */
.table-wrap {
    overflow-x: auto;
}

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

table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
}

table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    vertical-align: middle;
}

table tr:hover {
    background: rgba(79, 140, 255, 0.03);
}

.status {
    display: inline-block;
    padding: 2px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.status-pending { background: rgba(251,191,36,0.2); color: var(--warning); }
.status-approved { background: rgba(52,211,153,0.2); color: var(--success); }
.status-completed { background: rgba(79,140,255,0.2); color: var(--primary); }
.status-rejected { background: rgba(239,68,68,0.2); color: var(--danger); }

.btn-sm {
    padding: 4px 14px;
    border-radius: 6px;
    border: none;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-sm:hover {
    transform: scale(1.05);
}

.btn-sm.approve { background: var(--success); color: #0a0e17; }
.btn-sm.reject { background: var(--danger); color: #fff; }
.btn-sm.complete { background: var(--primary); color: #fff; }

/* ===== SEARCH & FILTER ===== */
.search-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.search-bar input {
    flex: 1;
    min-width: 200px;
    padding: 10px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary);
}

.search-bar select {
    padding: 10px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.show { display: block; }
    .sidebar-toggle { display: block; }
    body { padding-left: 0; }
    .main-content { padding: 16px; }
}

@media (max-width: 768px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .content-header { flex-direction: column; align-items: stretch; }
    .content-header h2 { font-size: 20px; }
    .search-bar { flex-direction: column; }
    .search-bar input { min-width: unset; }
    .sidebar { width: 280px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    table td, table th { font-size: 12px; padding: 8px 10px; }
    .card { padding: 16px; }
}