:root {
    --bg: #0F0F12;
    --surface: #16161B;
    --surface-2: #1C1C22;
    --border: #26262E;
    --text: #E8E8EA;
    --muted: #7A7A85;
    /* Steel blue accent matches the blog tools (caffeine, ROAS, customer-economics) */
    --accent: #6FA0D1;
    --accent-strong: #4A7BA7;
    --positive: #7CC4A0;
    --warn: #E8B976;
    --alert: #D97A7A;
    --container-max: 1200px;
    --gutter: 1.5rem;
    --radius: 0.75rem;
    --radius-sm: 0.5rem;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.15s ease;
}
a:hover { color: var(--accent); }

h1, h2, h3, h4 {
    font-weight: 600;
    letter-spacing: -0.01em;
    margin: 0;
}
h1 { font-size: 1.875rem; }
h2 { font-size: 1.125rem; }

.muted { color: var(--muted); }
.mono {
    font-family: 'JetBrains Mono', 'SF Mono', 'Menlo', monospace;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.01em;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--gutter);
}

/* ---- Topbar ---- */
.topbar {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    background: rgba(15, 15, 18, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 100;
}
.topbar .container {
    display: flex;
    align-items: center;
    gap: 2rem;
}
.brand {
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    color: var(--text);
}
.brand-dot { color: var(--accent); }
.topnav {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-left: auto;
}
.topnav a {
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--muted);
    padding: 0.25rem 0;
    border-bottom: 1px solid transparent;
}
.topnav a:hover { color: var(--text); }
.topnav a.active {
    color: var(--text);
    border-bottom-color: var(--accent);
}

/* ---- Page head ---- */
.page-head {
    padding: 2.5rem 0 1.5rem;
}
.page-head h1 {
    font-family: 'Inter', sans-serif;
    font-weight: 800;
    letter-spacing: -0.02em;
    font-size: 2rem;
}
.page-head p {
    margin: 0.5rem 0 0;
    font-size: 0.9375rem;
}

/* ---- Grid ---- */
.grid {
    display: grid;
    gap: 1rem;
}
.grid-tiles {
    grid-template-columns: repeat(4, 1fr);
}
@media (max-width: 768px) {
    .grid-tiles { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .grid-tiles { grid-template-columns: 1fr; }
}

/* ---- Tile ---- */
.tile {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.25rem 1.125rem;
}
.tile-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent);
    margin-bottom: 0.5rem;
}
.tile-value {
    font-family: 'Inter', sans-serif;
    font-size: 1.875rem;
    font-weight: 800;
    line-height: 1.15;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.01em;
}
.tile-value .unit {
    font-size: 0.8125rem;
    color: var(--muted);
    margin-left: 0.3rem;
    font-weight: 500;
    letter-spacing: 0;
}
.tile-trend {
    margin-top: 0.625rem;
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

/* ---- Panel (chart container) ---- */
.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-top: 1.5rem;
}
.panel-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.panel-head h2 {
    font-family: 'Inter', sans-serif;
    font-weight: 800;
    font-size: 1.125rem;
    letter-spacing: -0.005em;
}
.panel-head .muted {
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--muted);
}

.chart-tall { width: 100%; height: 360px; }
.chart-short { width: 100%; height: 180px; }
.chart-spark { width: 100%; height: 110px; }

/* ---- Sparkline grid (dashboard) ---- */
.grid-sparks {
    grid-template-columns: repeat(2, 1fr);
}
@media (max-width: 768px) {
    .grid-sparks { grid-template-columns: 1fr; }
}
.spark-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem 0.75rem;
    display: flex;
    flex-direction: column;
    min-width: 0;
    transition: border-color 0.15s ease;
}
a.spark-card:hover { border-color: var(--accent); }
.spark-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}
.spark-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent);
}
.spark-current {
    font-family: 'JetBrains Mono', monospace;
    font-variant-numeric: tabular-nums;
    font-size: 0.875rem;
    color: var(--text);
}
.spark-current .unit {
    color: var(--muted);
    font-size: 0.75rem;
    margin-left: 0.2rem;
}
a.spark-card:hover .spark-label { color: var(--text); }

/* ---- Stat strip ---- */
.stat-strip {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 1.5rem;
}
.stat-strip.stat-strip-4 { grid-template-columns: repeat(4, 1fr); }
.stat-strip .stat {
    background: var(--surface);
    padding: 1rem 1.25rem;
}
.stat-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent);
    margin-bottom: 0.3rem;
}
.stat-value {
    font-family: 'Inter', sans-serif;
    font-variant-numeric: tabular-nums;
    font-size: 1.5rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.01em;
}
.stat-value .unit {
    font-size: 0.6875rem;
    color: var(--muted);
    margin-left: 0.25rem;
    font-weight: 500;
    letter-spacing: 0;
}
.stat-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    color: var(--muted);
    margin-top: 0.25rem;
    font-variant-numeric: tabular-nums;
}
@media (max-width: 768px) {
    .stat-strip { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .stat-strip { grid-template-columns: 1fr; }
}

/* ---- Last-rows table ---- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-family: 'JetBrains Mono', monospace;
    font-variant-numeric: tabular-nums;
    font-size: 0.8125rem;
}
.data-table th,
.data-table td {
    text-align: right;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
}
.data-table th:first-child,
.data-table td:first-child {
    text-align: left;
    color: var(--muted);
}
.data-table th {
    font-weight: 500;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.6875rem;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table .src-cell {
    color: var(--muted);
    text-transform: lowercase;
}

/* ---- Range picker ---- */
.range-picker {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
}
.range-picker .chip {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.45rem 0.9rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-size: 0.6875rem;
    font-family: inherit;
    font-weight: 700;
    user-select: none;
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.range-picker .chip:hover { color: var(--text); border-color: var(--accent); }
.range-picker .chip.active {
    background: rgba(111, 160, 209, 0.12);
    color: var(--accent);
    border-color: var(--accent);
}
.range-picker .compare-toggle {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--muted);
    cursor: pointer;
    user-select: none;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}
.range-picker .compare-toggle input { accent-color: var(--accent); cursor: pointer; }
.range-picker .compare-toggle.disabled { opacity: 0.35; pointer-events: none; }
@media (max-width: 600px) {
    .range-picker .compare-toggle { margin-left: 0; width: 100%; }
}

/* ---- Section header (for sub-sections within a page) ---- */
.section-head {
    margin: 2rem 0 1rem;
}
.section-head h3 {
    font-family: 'Inter', sans-serif;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text);
    margin: 0 0 0.25rem;
    letter-spacing: -0.01em;
}
.section-head .muted {
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* ---- Footer ---- */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    margin-top: 4rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
}
.site-footer .container {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

/* ---- Selection ---- */
::selection { background: var(--accent); color: var(--bg); }