/* ===== Quant-research palette: deep slate + cyan accent ===== */
:root {
  --bg: #0b1014;
  --surface: #11171c;
  --surface-2: #161d24;
  --surface-3: #1c252e;
  --border: #233039;
  --border-strong: #2f404c;
  --text: #e6edf3;
  --text-muted: #93a4b3;
  --text-faint: #5d6e7c;
  --accent: #6ee7d8;            /* cyan-teal */
  --accent-dim: #2c8f80;
  --accent-soft: rgba(110, 231, 216, 0.12);
  --good: #5fd49a;
  --meh:  #e9c46a;
  --bad:  #ef6f7c;
  --grid: #1d2730;

  /* Series colours */
  --c-sig:   #6ee7d8;
  --c-sigll: #b39df7;
  --c-gbm:   #7fb6f5;
  --c-ou:    #f1a261;
  --c-arma:  #e08fb8;

  /* tokens */
  --radius: 12px;
  --radius-sm: 8px;
  --space-1: 4px; --space-2: 8px; --space-3: 12px;
  --space-4: 16px; --space-5: 20px; --space-6: 24px;
  --space-8: 32px; --space-10: 40px; --space-12: 48px;
  --shadow: 0 2px 18px rgba(0,0,0,0.32);

  --text-xs: clamp(0.75rem, 0.7rem + 0.18vw, 0.82rem);
  --text-sm: clamp(0.84rem, 0.78rem + 0.25vw, 0.95rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.22vw, 1.05rem);
  --text-lg: clamp(1.05rem, 0.95rem + 0.35vw, 1.22rem);
  --text-xl: clamp(1.35rem, 1.1rem + 0.9vw, 1.95rem);
}

[data-theme="light"] {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --surface-2: #f1ede4;
  --surface-3: #e7e1d4;
  --border: #ddd6c5;
  --border-strong: #c8c0ac;
  --text: #1d1f22;
  --text-muted: #5a605e;
  --text-faint: #8a8f8c;
  --accent: #0a7a72;
  --accent-dim: #0a7a72;
  --accent-soft: rgba(10, 122, 114, 0.10);
  --grid: #e3dccd;
  --c-sig:   #0a7a72;
  --c-sigll: #6f4abd;
  --c-gbm:   #1a64ad;
  --c-ou:    #b3631d;
  --c-arma:  #b14887;
  --shadow: 0 2px 14px rgba(20, 18, 12, 0.07);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; scroll-padding-top: 96px; }
html, body { height: 100%; }
body {
  font-family: 'Satoshi', system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: var(--text-base);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}
code, .formula, .kpi-value, table td.num, [data-tabular] {
  font-family: 'JetBrains Mono', ui-monospace, "SF Mono", Menlo, monospace;
  font-variant-numeric: tabular-nums lining-nums;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
em { font-style: italic; color: var(--text); }
strong { font-weight: 600; color: var(--text); }

/* ===== Layout ===== */
.dashboard {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: auto 1fr;
  min-height: 100dvh;
}

.sidebar {
  grid-row: 1 / -1;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: var(--space-6) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  position: sticky; top: 0;
  height: 100dvh;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.brand {
  display: flex; align-items: center; gap: var(--space-3);
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.logo { width: 32px; height: 32px; color: var(--text); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 700; letter-spacing: 0.04em; font-size: 0.95rem; }
.brand-tag  { color: var(--text-muted); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; }

nav { display: flex; flex-direction: column; gap: var(--space-1); }
.nav-label {
  font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-faint); margin-top: var(--space-4); margin-bottom: var(--space-1);
}
nav a {
  color: var(--text-muted);
  font-size: var(--text-sm);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
}
nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
nav a.is-active { color: var(--text); background: var(--accent-soft); }

.sidebar-foot {
  margin-top: auto;
  display: flex; align-items: center; gap: var(--space-3);
  color: var(--text-muted);
  font-size: 0.72rem;
}
.theme-toggle {
  width: 32px; height: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text);
  display: grid; place-items: center;
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent-dim); }

/* ===== Header ===== */
.header {
  grid-column: 2;
  background: color-mix(in oklab, var(--bg) 92%, var(--surface));
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 5;
  backdrop-filter: blur(8px);
}
.header-inner {
  padding: var(--space-5) var(--space-8);
  display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-6);
  flex-wrap: wrap;
}
.page-title {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
.page-sub { color: var(--text-muted); font-size: var(--text-sm); margin-top: 4px; }
.header-meta { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.meta-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.dot-sig   { background: var(--c-sig); }
.dot-sigll { background: var(--c-sigll); }
.dot-gbm   { background: var(--c-gbm); }
.dot-ou    { background: var(--c-ou); }
.dot-arma  { background: var(--c-arma); }

/* ===== Main ===== */
.main {
  grid-column: 2;
  padding: var(--space-8);
  display: flex; flex-direction: column;
  gap: var(--space-12);
  max-width: 1400px;
}

.section { display: flex; flex-direction: column; gap: var(--space-5); scroll-margin-top: 90px; }
.section-head { display: flex; flex-direction: column; gap: var(--space-2); max-width: 90ch; }
.kicker {
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.section h2 {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.lede { color: var(--text-muted); font-size: var(--text-sm); max-width: 80ch; }
.lede em { color: var(--text); font-style: italic; }

/* ===== Cards & grids ===== */
.card, .chart-card, .table-card, .callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow);
}
.card.mini { padding: var(--space-4) var(--space-5); }
.card h3.card-title { font-size: var(--text-lg); margin-bottom: var(--space-3); font-weight: 600; }
.card h4 { font-size: 0.95rem; margin-bottom: var(--space-2); font-weight: 600; }
.card p + p { margin-top: var(--space-3); }
.card.use-case { background: var(--surface-2); }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: var(--space-5); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-4); }

.formula {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-3);
  font-size: 0.85rem;
  color: var(--accent);
  white-space: pre-wrap;
  overflow-x: auto;
}

.bullets { padding-left: 1.2em; }
.bullets li { margin-bottom: 6px; color: var(--text-muted); font-size: var(--text-sm); }
.bullets li strong { color: var(--text); }

/* ===== KPIs ===== */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
}
.kpi {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-5);
  display: flex; flex-direction: column; gap: 6px;
  position: relative;
  overflow: hidden;
}
.kpi::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--accent);
  opacity: 0.7;
}
.kpi[data-sym="SPY"]::before { background: var(--c-gbm); }
.kpi-label { font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-faint); }
.kpi-value { font-size: 1.45rem; font-weight: 600; color: var(--text); }

/* ===== Chart cards ===== */
.chart-head {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
}
.chart-head h3 { font-size: var(--text-lg); font-weight: 600; }
.hint { color: var(--text-faint); font-size: 0.78rem; letter-spacing: 0.01em; }
.chart-wrap { height: 320px; position: relative; }
.chart-wrap-sm { height: 160px; margin-top: var(--space-3); }
.chart-wrap > canvas { max-width: 100%; }

.seg { display: inline-flex; background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; padding: 3px; }
.seg-btn {
  padding: 5px 14px; border-radius: 999px;
  background: transparent; color: var(--text-muted);
  font-size: 0.78rem; font-weight: 500; letter-spacing: 0.02em;
}
.seg-btn:hover { color: var(--text); }
.seg-btn.is-active { background: var(--accent); color: #0b1014; }

/* ===== Tables ===== */
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }
thead th {
  text-align: left; color: var(--text-faint);
  font-weight: 600; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky; top: 0;
}
tbody td, tbody th {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  color: var(--text);
  text-align: left;
  font-weight: 400;
}
tbody th { color: var(--text); font-weight: 600; white-space: nowrap; }
tbody tr:hover { background: var(--surface-2); }
tbody td.num { text-align: right; }
tbody td.good { color: var(--good); }
tbody td.meh  { color: var(--meh); }
tbody td.bad  { color: var(--bad); }

table.thick tbody td, table.thick tbody th { padding: 14px 16px; }
table.thick .col-pos { color: var(--good); }
table.thick .col-neg { color: var(--bad); }

/* method dot in first cell */
tbody th .dot { margin-right: 8px; transform: translateY(1px); }

/* ===== Callout ===== */
.callout {
  background: var(--accent-soft);
  border-color: color-mix(in oklab, var(--accent) 30%, var(--border));
}
.callout p { color: var(--text); font-size: var(--text-sm); }

/* ===== Footer ===== */
.footer {
  margin-top: var(--space-12);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 0.78rem;
}

.footnote { color: var(--text-faint); font-size: 0.78rem; margin-top: var(--space-3); }
code { background: var(--surface-2); border: 1px solid var(--border); padding: 1px 6px; border-radius: 4px; font-size: 0.82rem; color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 920px) {
  .dashboard { grid-template-columns: 1fr; }
  .sidebar {
    grid-row: auto;
    grid-column: 1;
    position: relative;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-3);
    padding: var(--space-4);
  }
  .sidebar nav {
    flex-direction: row; flex-wrap: wrap; gap: 4px;
  }
  .sidebar .nav-label { display: none; }
  .sidebar-foot { width: 100%; justify-content: flex-end; }
  .header { grid-column: 1; position: relative; }
  .main { grid-column: 1; padding: var(--space-5); }
}