/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --sidebar-bg: #1a1a2e;
    --sidebar-width: 220px;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --bg: #f5f6fa;
    --card-bg: #ffffff;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --border: #e0e4e8;
    --green: #27ae60;
    --red: #e74c3c;
    --orange: #f39c12;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

body {
    font-family: -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    min-height: 100vh;
    font-size: 14px;
    line-height: 1.5;
}

/* === Sidebar === */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: var(--sidebar-bg);
    color: #ecf0f1;
    position: fixed;
    top: 0;
    left: 0;
    overflow-y: auto;
    z-index: 100;
    padding-bottom: 2rem;
}

.sidebar-header {
    padding: 1.5rem 1.2rem 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.5px;
}

.sidebar-subtitle {
    font-size: 0.75rem;
    color: #7f8c8d;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-list {
    list-style: none;
    padding: 0.5rem 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 1.2rem;
    color: #bdc3c7;
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.15s;
    border-left: 3px solid transparent;
}

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

.nav-link.active {
    background: rgba(52,152,219,0.15);
    color: #fff;
    border-left-color: var(--accent);
    font-weight: 600;
}

.nav-icon { font-size: 0.5rem; opacity: 0.5; }

.nav-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.nav-divider {
    margin: 0.5rem 1.2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.nav-section-title {
    padding: 0.5rem 1.2rem 0.2rem;
    font-size: 0.7rem;
    color: #7f8c8d;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* === Content === */
.content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 1.5rem;
    min-height: 100vh;
}

.content-inner {
    max-width: 1400px;
    margin: 0 auto;
}

/* === Page Header === */
.page-header {
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
}

.page-header p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-top: 0.2rem;
}

/* === Cards === */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 1.2rem;
    margin-bottom: 1.2rem;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: var(--text);
}

/* === Metric Cards === */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.metric-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 1rem;
    text-align: center;
}

.metric-label {
    font-size: 0.75rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.3rem;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
}

.metric-subtitle {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-top: 0.2rem;
}

.metric-card.highlight-green .metric-value { color: var(--green); }
.metric-card.highlight-red .metric-value { color: var(--red); }
.metric-card.highlight-blue .metric-value { color: var(--accent); }

/* === Top cards (3 highlights) === */
.top-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.top-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 1rem 1.2rem;
    border-left: 4px solid var(--accent);
}

.top-card .top-label {
    font-size: 0.75rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.top-card .top-value {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0.2rem 0;
}

.top-card .top-name {
    font-size: 0.85rem;
    color: var(--text-light);
}

.top-card.green { border-left-color: var(--green); }
.top-card.green .top-value { color: var(--green); }
.top-card.blue { border-left-color: var(--accent); }
.top-card.blue .top-value { color: var(--accent); }
.top-card.orange { border-left-color: var(--orange); }
.top-card.orange .top-value { color: var(--orange); }

/* === Tables === */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table thead th {
    background: #f8f9fa;
    padding: 0.7rem 0.8rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.data-table thead th:hover { background: #eef1f5; }
.data-table thead th.sort-asc::after { content: " ▲"; font-size: 0.6rem; }
.data-table thead th.sort-desc::after { content: " ▼"; font-size: 0.6rem; }

.data-table tbody td {
    padding: 0.6rem 0.8rem;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.data-table tbody tr { transition: background 0.1s; }
.data-table tbody tr:hover { background: #f0f4ff; }
.data-table tbody tr.clickable { cursor: pointer; }

.data-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.data-table .positive { color: var(--green); }
.data-table .negative { color: var(--red); }

/* === Tabs === */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border);
    margin-bottom: 1.2rem;
}

.tab-btn {
    padding: 0.6rem 1.2rem;
    border: none;
    background: none;
    font-size: 0.85rem;
    color: var(--text-light);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    font-weight: 500;
    transition: all 0.15s;
}

.tab-btn:hover { color: var(--text); }
.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    font-weight: 600;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* === Charts === */
.chart-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 1rem;
    margin-bottom: 1.2rem;
}

.chart-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
}

/* === Buttons === */
.btn {
    padding: 0.5rem 1.2rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    text-decoration: none;
    display: inline-block;
}

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

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

.btn-danger {
    background: var(--red);
    color: #fff;
}

.btn-danger:hover { background: #c0392b; }

.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.8rem; }

/* === Strategy selector (comparison) === */
.strategy-selector {
    margin-bottom: 1.2rem;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.5rem;
    margin: 0.8rem 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 4px;
    transition: background 0.1s;
}

.checkbox-label:hover { background: #f0f4ff; }

.checkbox-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* === Badges === */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success { background: #d4edda; color: #155724; }
.badge-warning { background: #fff3cd; color: #856404; }
.badge-danger { background: #f8d7da; color: #721c24; }

/* === Methodology === */
.methodology {
    line-height: 1.7;
}

.methodology h3 {
    font-size: 1.1rem;
    margin: 1.2rem 0 0.5rem;
    color: var(--text);
}

.methodology p {
    margin-bottom: 0.8rem;
    color: #555;
}

.methodology .paper-ref {
    background: #f8f9fa;
    padding: 0.8rem 1rem;
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.methodology table {
    width: 100%;
    border-collapse: collapse;
    margin: 0.8rem 0;
    font-size: 0.85rem;
}

.methodology td, .methodology th {
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--border);
    text-align: left;
}

.methodology th {
    background: #f8f9fa;
    font-weight: 600;
}

/* === Slider === */
.date-slider {
    width: 100%;
    margin: 0.5rem 0;
}

.date-display {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

/* === Grid helpers === */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }

/* === Responsive === */
@media (max-width: 1200px) {
    .chart-row, .grid-2 { grid-template-columns: 1fr; }
    .top-cards { grid-template-columns: 1fr; }
    .grid-3 { grid-template-columns: 1fr 1fr; }
    .grid-4 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .sidebar { width: 60px; }
    .sidebar-header h2, .sidebar-subtitle, .nav-section-title,
    .nav-link span:last-child, .nav-link .nav-dot + span { display: none; }
    .content { margin-left: 60px; padding: 1rem; }
    .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* === Sparkline container === */
.sparkline-cell { display: inline-block; vertical-align: middle; }

/* === Search input === */
.search-input {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.85rem;
    width: 250px;
    outline: none;
    transition: border-color 0.15s;
}

.search-input:focus { border-color: var(--accent); }

/* === Loading spinner === */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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