/* ============ Design tokens ============ */
:root {
  --surface-1:  #fcfcfb;
  --surface-2:  #ffffff;
  --page:       #f9f9f7;
  --text-primary:   #0b0b0b;
  --text-secondary: #52514e;
  --text-muted:     #898781;
  --gridline:   #e1e0d9;
  --baseline:   #c3c2b7;
  --border:     rgba(11,11,11,0.10);
  --good:       #006300;

  --series-1: #2a78d6; /* blue */
  --series-2: #1baf7a; /* aqua */
  --series-3: #eda100; /* yellow */
  --series-4: #008300; /* green */
  --series-5: #4a3aa7; /* violet */
  --series-6: #e34948; /* red */
  --series-7: #e87ba4; /* magenta */
  --series-8: #eb6834; /* orange */

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 1px 2px rgba(11,11,11,0.04), 0 8px 24px -12px rgba(11,11,11,0.12);
  --font: system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --max-w: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface-1:  #1a1a19;
    --surface-2:  #221f1d;
    --page:       #0d0d0d;
    --text-primary:   #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted:     #8b8983;
    --gridline:   #2c2c2a;
    --baseline:   #383835;
    --border:     rgba(255,255,255,0.10);
    --good:       #0ca30c;

    --series-1: #3987e5;
    --series-2: #199e70;
    --series-3: #c98500;
    --series-4: #008300;
    --series-5: #9085e9;
    --series-6: #e66767;
    --series-7: #d55181;
    --series-8: #d95926;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--page);
  color: var(--text-primary);
  font-family: var(--font);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
a { color: inherit; }
code {
  font-family: var(--font-mono);
  font-size: 0.87em;
  background: rgba(127,127,127,0.12);
  padding: 0.1em 0.4em;
  border-radius: 4px;
}
.accent { color: var(--series-1); }

/* ============ Header ============ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 700; font-size: 1.05rem; text-decoration: none; letter-spacing: -0.01em; }
.main-nav { display: flex; gap: 28px; }
.main-nav a { text-decoration: none; font-size: 0.92rem; color: var(--text-secondary); font-weight: 500; }
.main-nav a:hover { color: var(--text-primary); }
.nav-toggle { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 20px; height: 2px; background: var(--text-primary); border-radius: 2px; }

/* ============ Hero ============ */
.hero { padding: 72px 0 40px; }
.hero-inner { max-width: 760px; }
.eyebrow {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--series-1); margin: 0 0 12px;
}
h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 20px; font-weight: 800; }
.hero-lead { font-size: 1.08rem; color: var(--text-secondary); max-width: 640px; margin: 0 0 32px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 48px; }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 22px; border-radius: 999px; font-weight: 600; font-size: 0.92rem;
  text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, opacity .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--text-primary); color: var(--page); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text-primary); }

.stat-strip {
  display: flex; flex-wrap: wrap; gap: 0;
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.stat-chip {
  display: flex; flex-direction: column; gap: 2px;
  padding: 18px 28px 18px 0; margin-right: 28px;
  border-right: 1px solid var(--border);
  flex: 1 1 auto; min-width: 120px;
}
.stat-chip:last-child { border-right: none; }
.stat-value { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.01em; }
.stat-label { font-size: 0.8rem; color: var(--text-muted); }

/* ============ Process strip ============ */
.process { padding: 8px 0 56px; }
.process-steps {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px;
}
.process-steps li {
  border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 18px 16px; background: var(--surface-1);
  display: flex; flex-direction: column; gap: 4px;
}
.step-no { font-size: 0.75rem; color: var(--series-1); font-weight: 700; }
.step-title { font-weight: 700; font-size: 1rem; }
.step-desc { font-size: 0.8rem; color: var(--text-muted); }

/* ============ Sections ============ */
.section { padding: 72px 0; }
.section-alt { background: var(--surface-1); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); letter-spacing: -0.02em; margin: 0 0 14px; }
.section-lead { color: var(--text-secondary); max-width: 700px; margin: 0 0 40px; font-size: 1rem; }

.card-block { margin-bottom: 48px; }
.card-block:last-child { margin-bottom: 0; }
.card-block h3 { display: flex; align-items: center; gap: 12px; font-size: 1.2rem; margin: 0 0 16px; }
.num-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--series-1); color: white; font-size: 0.85rem; font-weight: 700;
  flex-shrink: 0;
}
.card-block > p { color: var(--text-secondary); max-width: 780px; }

.btn-sm { padding: 8px 16px; font-size: 0.82rem; flex-shrink: 0; }

.raw-data-block {
  margin: 22px 0 28px;
  border: 1px solid var(--border); border-radius: var(--radius-md);
  background: var(--surface-1); overflow: hidden;
}
.raw-data-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 14px 16px; border-bottom: 1px solid var(--border);
}
.raw-tabs { display: flex; flex-wrap: wrap; gap: 6px; }
.raw-tab {
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text-secondary);
  border-radius: 999px; padding: 6px 13px; font-size: 0.78rem; font-family: var(--font-mono); cursor: pointer;
}
.raw-tab.active { background: var(--text-primary); color: var(--page); border-color: var(--text-primary); }
.raw-table-wrap { overflow: auto; max-height: 300px; }
.raw-table-wrap table { width: 100%; border-collapse: collapse; font-size: 0.8rem; font-family: var(--font-mono); white-space: nowrap; }
.raw-table-wrap th {
  position: sticky; top: 0; text-align: left; background: var(--surface-1);
  padding: 8px 12px; color: var(--text-primary); font-weight: 700; border-bottom: 1px solid var(--border);
}
.raw-table-wrap td { padding: 7px 12px; border-bottom: 1px solid var(--gridline); color: var(--text-secondary); }
.raw-caption { margin: 0; padding: 10px 16px; font-size: 0.78rem; color: var(--text-muted); border-top: 1px solid var(--border); }

.etl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
.etl-card {
  background: var(--surface-1); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 22px 24px;
}
.etl-card h4 { margin: 0 0 12px; font-size: 0.98rem; }
.etl-card p { color: var(--text-secondary); font-size: 0.92rem; }
.etl-list { margin: 8px 0; padding-left: 20px; color: var(--text-secondary); font-size: 0.9rem; }
.etl-list li { margin-bottom: 4px; }
.etl-note { font-size: 0.84rem; color: var(--text-muted); border-left: 2px solid var(--series-1); padding-left: 12px; margin-top: 12px; }

.rename-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; margin-bottom: 4px; }
.rename-table th { text-align: left; color: var(--text-muted); font-weight: 600; padding: 6px 8px; font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.04em; }
.rename-table td { padding: 7px 8px; border-top: 1px solid var(--gridline); }
.rename-table td:nth-child(2) { color: var(--text-muted); width: 20px; }

.code-block {
  background: color-mix(in srgb, var(--text-primary) 4%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 0.82rem;
  overflow-x: auto;
  margin: 10px 0;
}
.code-block code { background: none; padding: 0; font-size: inherit; color: var(--text-primary); }

.schema-diagram { margin: 28px 0; }
.schema-svg { width: 100%; height: auto; min-width: 560px; }
.schema-box { fill: var(--surface-2); stroke: var(--border); stroke-width: 1.5; }
.schema-box.fact { fill: var(--series-1); stroke: var(--series-1); }
.schema-box.measures { fill: none; stroke: var(--text-muted); stroke-dasharray: 5 4; }
.schema-box-title { text-anchor: middle; font-size: 13px; font-weight: 700; fill: var(--text-primary); font-family: var(--font); }
.schema-box-sub { text-anchor: middle; font-size: 10px; fill: var(--text-muted); font-family: var(--font); }
.fact-title, .fact-sub { fill: #ffffff; }
.fact-sub { opacity: 0.85; }
.schema-line { stroke: var(--baseline); stroke-width: 1.5; }
.schema-line-label { font-size: 9.5px; fill: var(--text-muted); font-family: var(--font-mono); }
.rel-table-wrap { overflow-x: auto; }
.rel-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; margin-top: 8px; }
.rel-table th { text-align: left; color: var(--text-muted); font-weight: 600; padding: 8px 12px; font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.04em; border-bottom: 1px solid var(--border); }
.rel-table td { padding: 10px 12px; border-bottom: 1px solid var(--gridline); }

/* ============ Measures ============ */
.measure-groups { display: flex; flex-direction: column; gap: 36px; }
.measure-group h3 { font-size: 1.05rem; margin: 0 0 4px; }
.measure-group .group-desc { color: var(--text-muted); font-size: 0.88rem; margin: 0 0 16px; }
.measure-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 14px; }
.measure-card {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 18px 20px; box-shadow: var(--shadow-card);
}
.measure-card h4 { margin: 0 0 8px; font-size: 0.95rem; font-family: var(--font-mono); }
.measure-card pre { margin: 0 0 10px; white-space: pre-wrap; font-size: 0.8rem; font-family: var(--font-mono); background: color-mix(in srgb, var(--text-primary) 4%, transparent); border-radius: 6px; padding: 10px 12px; }
.measure-card p { margin: 0; font-size: 0.86rem; color: var(--text-secondary); }

/* ============ Dashboard recreation ============ */
.page-tabs { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.page-tab {
  padding: 10px 18px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--surface-1); color: var(--text-secondary); font-weight: 600; font-size: 0.88rem;
  cursor: pointer;
}
.page-tab.active { background: var(--text-primary); color: var(--page); border-color: var(--text-primary); }

.dashboard-shell {
  display: grid; grid-template-columns: 220px 1fr; gap: 24px;
  background: var(--surface-1); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 24px; box-shadow: var(--shadow-card);
}
.filter-panel h4 { margin: 0 0 16px; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }
.filter-group { margin-bottom: 20px; }
.filter-group label { display: block; font-size: 0.78rem; font-weight: 700; margin-bottom: 8px; color: var(--text-secondary); }
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text-secondary);
  border-radius: 999px; padding: 5px 12px; font-size: 0.78rem; cursor: pointer; font-family: var(--font);
}
.chip.active { background: var(--series-1); border-color: var(--series-1); color: #fff; }
.filter-hint { font-size: 0.76rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 14px; margin-top: 4px; }

.dash-page { display: none; }
.dash-page.active { display: block; }

.kpi-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 20px; }
.kpi-card {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 16px 18px; display: flex; flex-direction: column; gap: 6px;
}
.kpi-label { font-size: 0.78rem; color: var(--text-muted); font-weight: 600; }
.kpi-value { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.01em; }
.kpi-value.good { color: var(--good); }

.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.chart-card {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 18px 20px;
}
.chart-card.span-2 { grid-column: span 2; }
.chart-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.chart-head h4 { margin: 0; font-size: 0.94rem; }
.chart-note { font-size: 0.76rem; color: var(--text-muted); font-style: italic; }
.chart-canvas-wrap { position: relative; height: 220px; }
.chart-canvas-wrap.tall { height: 280px; }
.chart-insight {
  margin: 12px 0 0; padding-top: 12px; border-top: 1px solid var(--gridline);
  font-size: 0.84rem; color: var(--text-secondary);
}

.table-wrap { overflow-x: auto; }
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }
.table-wrap th { text-align: left; padding: 8px 10px; color: var(--text-muted); font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.04em; border-bottom: 1px solid var(--border); }
.table-wrap td { padding: 8px 10px; border-bottom: 1px solid var(--gridline); font-variant-numeric: tabular-nums; }
.table-wrap td.num { text-align: right; }
.bar-cell { display: flex; align-items: center; gap: 8px; }
.bar-cell .bar-track { flex: 1; height: 6px; border-radius: 3px; background: var(--gridline); overflow: hidden; }
.bar-cell .bar-fill { height: 100%; background: var(--series-1); border-radius: 3px; }

/* ============ Footer ============ */
.site-footer { border-top: 1px solid var(--border); padding: 40px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; flex-wrap: wrap; }
.footer-title { font-weight: 700; margin: 0 0 2px; }
.footer-sub { color: var(--text-muted); font-size: 0.86rem; margin: 0; }
.footer-meta { max-width: 420px; font-size: 0.82rem; color: var(--text-muted); }

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex; flex-direction: column; gap: 0;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--surface-1); border-bottom: 1px solid var(--border);
    padding: 8px 24px 16px;
  }
  .main-nav.open a { padding: 10px 0; border-bottom: 1px solid var(--border); }
  .main-nav.open a:last-child { border-bottom: none; }
  .nav-toggle { display: flex; }
  .process-steps { grid-template-columns: 1fr 1fr; }
  .etl-grid { grid-template-columns: 1fr; }
  .dashboard-shell { grid-template-columns: 1fr; }
  .filter-panel { display: flex; flex-wrap: wrap; gap: 20px; }
  .kpi-row { grid-template-columns: 1fr 1fr; }
  .chart-grid { grid-template-columns: 1fr; }
  .chart-card.span-2 { grid-column: span 1; }
}
@media (max-width: 520px) {
  .process-steps { grid-template-columns: 1fr; }
  .kpi-row { grid-template-columns: 1fr; }
  .stat-chip { min-width: 45%; }
}