:root {
    --bg-primary: #0a0d14;
    --bg-secondary: #0f1219;
    --bg-card: #151a23;
    --bg-card-hover: #1a2030;
    --border: #2d3748;
    --border-light: #3d4a5c;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --text-dim: #718096;
    --accent: #4a90e2;
    --accent-hover: #5ba0f2;
    --gain: #26a69a;
    --loss: #ef5350;
    --warning: #ffa726;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.4);
    --transition: 150ms ease;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ── Layout ───────────────────────────────────────────── */
.app { display: flex; min-height: 100vh; }

.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 16px 0;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    overflow-y: auto;
    z-index: 100;
    transition: transform 0.2s ease;
}

.sidebar-brand {
    padding: 0 20px 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}

.sidebar-brand h1 {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--text-primary);
}

.sidebar-brand p {
    font-size: 11px;
    color: var(--text-dim);
    margin-top: 2px;
}

/* ── Nav Groups (Collapsible) ─────────────────────────── */
.nav-group {
    padding: 0 10px;
    margin-bottom: 2px;
}

.nav-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    cursor: pointer;
    user-select: none;
    border-radius: 6px;
    transition: background var(--transition);
}

.nav-group-header:hover { background: var(--bg-card); }

.nav-group-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
}

.nav-group-chevron {
    width: 14px;
    height: 14px;
    color: var(--text-dim);
    transition: transform 0.2s ease;
}

.nav-group-chevron.open { transform: rotate(90deg); }

.nav-group-items {
    overflow: hidden;
    padding-left: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all var(--transition);
    text-decoration: none;
}

.nav-item:hover { background: var(--bg-card); color: var(--text-primary); }
.nav-item.active { background: var(--accent); color: #fff; }
.nav-item svg { width: 15px; height: 15px; flex-shrink: 0; }

.nav-divider {
    height: 1px;
    background: var(--border);
    margin: 8px 16px;
}

/* ── Mobile Hamburger ─────────────────────────────────── */
.mobile-header {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 48px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    z-index: 200;
    align-items: center;
    padding: 0 16px;
}

.hamburger {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
}

.hamburger svg { width: 24px; height: 24px; }

.mobile-header .brand {
    font-size: 14px;
    font-weight: 600;
    margin-left: 12px;
    color: var(--text-primary);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

.main {
    margin-left: 260px;
    flex: 1;
    padding: 32px;
    max-width: 1200px;
}

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

.page-header h2 {
    font-size: 22px;
    font-weight: 700;
}

/* ── Breadcrumbs ──────────────────────────────────────── */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 16px;
    font-size: 13px;
}

.breadcrumbs a {
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
    transition: color var(--transition);
}

.breadcrumbs a:hover { color: var(--accent-hover); }

.breadcrumbs .sep {
    color: var(--text-dim);
    font-size: 11px;
}

.breadcrumbs .current {
    color: var(--text-primary);
    font-weight: 500;
}

/* ── Detail Header ────────────────────────────────────── */
.detail-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.detail-header .back-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.detail-header .back-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
    color: var(--accent);
}

.detail-header .back-btn svg { width: 18px; height: 18px; }

.detail-header h2 {
    font-size: 22px;
    font-weight: 700;
}

.detail-header .detail-subtitle {
    font-size: 13px;
    color: var(--text-dim);
}

/* ── Cards & KPIs ─────────────────────────────────────── */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px;
    transition: all var(--transition);
}

.kpi-card:hover { border-color: var(--border-light); transform: translateY(-1px); box-shadow: var(--shadow); }
.kpi-card.clickable { cursor: pointer; }
.kpi-card.clickable:hover { border-color: var(--accent); }
.kpi-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-dim); margin-bottom: 6px; }
.kpi-value { font-family: var(--font-mono); font-size: 22px; font-weight: 700; color: var(--text-primary); }
.kpi-value-sm { font-family: var(--font-mono); font-size: 16px; font-weight: 600; color: var(--text-primary); }
.kpi-sub { font-size: 12px; color: var(--text-dim); margin-top: 4px; }

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 20px;
}

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

.card-header h3 { font-size: 15px; font-weight: 600; }

/* ── Quick Stats Grid ─────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.stat-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
}

.stat-item .stat-label {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-dim);
    margin-bottom: 4px;
}

.stat-item .stat-value {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-item .stat-detail {
    font-size: 11px;
    color: var(--text-dim);
    margin-top: 2px;
}

/* ── Charts ───────────────────────────────────────────── */
.chart-container { position: relative; width: 100%; }
.chart-container canvas { width: 100% !important; }

.chart-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

/* ── Tables ───────────────────────────────────────────── */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.data-table thead th {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 2px solid var(--border);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-dim);
    font-weight: 600;
    white-space: nowrap;
}

.data-table thead th.right { text-align: right; }

.data-table thead th.sortable {
    cursor: pointer;
    user-select: none;
    transition: color var(--transition);
}

.data-table thead th.sortable:hover { color: var(--accent); }

.data-table thead th .sort-indicator {
    display: inline-block;
    margin-left: 4px;
    font-size: 10px;
    color: var(--accent);
}

.data-table tbody td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

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

.data-table tbody tr.clickable-row {
    cursor: pointer;
    transition: background var(--transition);
}

.data-table tbody tr.clickable-row:hover {
    background: rgba(74, 144, 226, 0.08);
    border-color: var(--accent);
}

.data-table tbody td.right { text-align: right; }

.data-table tbody td.mono {
    font-family: var(--font-mono);
    font-size: 12px;
}

.data-table tfoot td {
    padding: 10px 12px;
    border-top: 2px solid var(--border);
    font-weight: 700;
    color: var(--text-primary);
}

.data-table tfoot td.right { text-align: right; }

/* ── Pagination ───────────────────────────────────────── */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    font-size: 13px;
}

.pagination .page-info {
    color: var(--text-dim);
}

.pagination .page-buttons {
    display: flex;
    gap: 4px;
}

.pagination .page-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 8px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 12px;
    font-family: var(--font-sans);
    transition: all var(--transition);
}

.pagination .page-btn:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}

.pagination .page-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.pagination .page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ── Per-page selector ────────────────────────────────── */
.per-page-select {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-dim);
}

.per-page-select select {
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 12px;
    font-family: var(--font-sans);
}

/* ── Table Toolbar ────────────────────────────────────── */
.table-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.table-toolbar .filters {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-select {
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 12px;
    font-family: var(--font-sans);
}

/* ── Variance colors ──────────────────────────────────── */
.variance-ok { color: var(--gain); }
.variance-warn { color: var(--warning); }
.variance-bad { color: var(--loss); }

/* ── Buttons ──────────────────────────────────────────── */
.btn-group { display: flex; gap: 8px; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn svg { width: 14px; height: 14px; }

.btn-pdf { border-color: var(--loss); color: var(--loss); }
.btn-pdf:hover { background: var(--loss); color: #fff; border-color: var(--loss); }

.btn-excel { border-color: var(--gain); color: var(--gain); }
.btn-excel:hover { background: var(--gain); color: #fff; border-color: var(--gain); }

.btn-zip { border-color: var(--accent); color: var(--accent); }
.btn-zip:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

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

.btn-sm {
    padding: 4px 10px;
    font-size: 11px;
    border-radius: 14px;
}

.btn-danger { border-color: var(--loss); color: var(--loss); }
.btn-danger:hover { background: var(--loss); color: #fff; }

/* ── Form Controls ────────────────────────────────────── */
.year-select {
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-sans);
}

.search-input {
    padding: 8px 14px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-sans);
    width: 300px;
    max-width: 100%;
}

.search-input::placeholder { color: var(--text-dim); }
.search-input:focus { outline: none; border-color: var(--accent); }

.text-input {
    padding: 8px 14px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-sans);
    width: 100%;
}

.text-input:focus { outline: none; border-color: var(--accent); }

/* ── API Key Display ──────────────────────────────────── */
.api-key-display {
    font-family: var(--font-mono);
    font-size: 13px;
    padding: 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    word-break: break-all;
    color: var(--gain);
}

.api-key-warning {
    font-size: 12px;
    color: var(--warning);
    margin-top: 8px;
}

/* ── Badge / Tag ──────────────────────────────────────── */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
}

.badge-gain { background: rgba(38,166,154,0.15); color: var(--gain); }
.badge-loss { background: rgba(239,83,80,0.15); color: var(--loss); }
.badge-warn { background: rgba(255,167,38,0.15); color: var(--warning); }
.badge-info { background: rgba(74,144,226,0.15); color: var(--accent); }

/* ── Heatmap ──────────────────────────────────────────── */
.heatmap-grid {
    display: grid;
    grid-template-columns: 50px repeat(24, 1fr);
    gap: 2px;
    font-size: 10px;
}

.heatmap-label {
    display: flex;
    align-items: center;
    color: var(--text-dim);
    font-size: 11px;
}

.heatmap-cell {
    aspect-ratio: 1;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 9px;
    color: var(--text-dim);
    cursor: default;
}

.heatmap-header {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dim);
    font-size: 10px;
    font-weight: 600;
}

/* ── Empty state ──────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-dim);
}

.empty-state .empty-icon { font-size: 32px; margin-bottom: 8px; opacity: 0.5; }
.empty-state p { font-size: 14px; }

/* ── Loading ──────────────────────────────────────────── */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px;
    color: var(--text-dim);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 12px;
}

.inline-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    vertical-align: middle;
    margin-right: 8px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Utilities ────────────────────────────────────────── */
.text-gain { color: var(--gain); }
.text-loss { color: var(--loss); }
.text-dim { color: var(--text-dim); }
.text-mono { font-family: var(--font-mono); }
.text-right { text-align: right; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.mb-2 { margin-bottom: 8px; }
.gap-4 { gap: 16px; }
.gap-2 { gap: 8px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.hidden { display: none; }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 1024px) {
    .sidebar { width: 220px; }
    .main { margin-left: 220px; padding: 20px; }
    .chart-row { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .mobile-header { display: flex; }
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
        z-index: 300;
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.open { display: block; }
    .main { margin-left: 0; padding: 16px; padding-top: 64px; }
    .kpi-grid { grid-template-columns: 1fr 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .page-header { flex-direction: column; align-items: flex-start; }
    .search-input { width: 100%; }
    .table-toolbar { flex-direction: column; align-items: flex-start; }
}