:root {
  --purple-dark: #3d3393;
  --purple-mid:  #5b50c8;
  --purple-light: #7b72e0;
  --accent: #5b50c8;
  --accent-hover: #4a40b0;
  --bg: #ffffff;
  --card: #ffffff;
  --border: #e2e4ef;
  --border-strong: #c8cbe0;
  --ink: #1a1a2e;
  --ink-muted: #5a5c7a;
  --ink-faint: #9a9cb8;
  --pill-bg: #eef0fb;
  --pill-active-bg: #5b50c8;
  --pill-active-text: #ffffff;
  --success: #1a7a4a;
  --success-bg: #e6f7ee;
  --warning: #7a5500;
  --warning-bg: #fff8e6;
  --info-bg: #eef0fb;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 100px;
  --shadow: 0 2px 12px rgba(61,51,147,0.08);
  --shadow-card: 0 1px 4px rgba(61,51,147,0.06), 0 4px 20px rgba(61,51,147,0.06);
  --accent-hover-bg: #f0effc;
}

[data-theme="dark"] {
  --bg: #0d0e1f;
  --card: #161828;
  --border: #2e3155;
  --border-strong: #424680;
  --ink: #f4f5ff;
  --ink-muted: #c0c4e8;
  --ink-faint: #8890b8;
  --pill-bg: #1e2040;
  --accent: #a59cf7;
  --accent-hover: #bdb6fa;
  --accent-hover-bg: #252a58;
  --success: #66dda0;
  --success-bg: #082416;
  --warning: #f7cf50;
  --warning-bg: #1e1600;
  --info-bg: #161938;
  --shadow: 0 2px 20px rgba(0,0,0,0.55);
  --shadow-card: 0 1px 4px rgba(0,0,0,0.45), 0 4px 24px rgba(0,0,0,0.35);
}

/* Theme toggle — integrated into header */
.site-header {
  background: linear-gradient(135deg, var(--purple-dark) 0%, var(--purple-mid) 60%, var(--purple-light) 100%);
  padding: 32px 24px 56px;
  position: relative;
  overflow: visible;
}
.site-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}
.site-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 80% 50%, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.site-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}
.site-header h1 {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.15;
  letter-spacing: -0.02em;
  flex: 1;
  min-width: 0;
}
.site-header p {
  color: rgba(255,255,255,0.78);
  font-size: 0.95rem;
  max-width: 560px;
  line-height: 1.55;
  margin-top: 0;
}
.theme-toggle {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: var(--radius-pill);
  padding: 7px 14px 7px 11px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  cursor: pointer;
  color: rgba(255,255,255,0.92);
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
  margin-top: 4px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.theme-toggle:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.35);
}
.theme-toggle-icon { font-size: 0.95rem; line-height: 1; }

/* Share button */
.share-btn {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: var(--radius-pill);
  padding: 7px 14px 7px 11px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: rgba(255,255,255,0.92);
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
  margin-top: 4px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.share-btn:hover { background: rgba(255,255,255,0.2); border-color: rgba(255,255,255,0.35); }

/* Language toggle — same style as theme toggle */
.lang-toggle {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: var(--radius-pill);
  padding: 7px 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: rgba(255,255,255,0.92);
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
  margin-top: 4px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  letter-spacing: 0.03em;
}
.lang-toggle:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.35);
}

/* Controls row in header */
.header-controls {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  flex-shrink: 0;
}

/* ════════════════════════════════════════
   DARK MODE — comprehensive overrides
   ════════════════════════════════════════ */

/* Metric group selector — main problem area */
[data-theme="dark"] .metric-group {
  background: var(--pill-bg);
}
[data-theme="dark"] .metric-group-selectable:hover {
  background: #252848;
  border-color: var(--accent);
}
[data-theme="dark"] .metric-group-selectable.selected {
  background: #252848;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(157,150,245,0.18);
}
[data-theme="dark"] .metric-group-label { color: var(--ink-muted); }
[data-theme="dark"] .metric-group-selectable.selected .metric-group-label { color: #c4bfff; }
[data-theme="dark"] .metric-group-badge { background: var(--border-strong); color: var(--ink-muted); }
[data-theme="dark"] .metric-group-selectable.selected .metric-group-badge { background: var(--accent); color: #fff; }

/* Chips inside groups */
[data-theme="dark"] .metric-chip-ex {
  background: #1e2040;
  border-color: var(--border-strong);
  color: var(--ink);
}
[data-theme="dark"] .metric-group-selectable.selected .metric-chip-ex {
  background: #2a2e58;
  border-color: rgba(157,150,245,0.45);
  color: #c4bfff;
}

/* Plan tab two-button selector */
[data-theme="dark"] .plan-metric-btn {
  background: var(--pill-bg);
  border-color: var(--border);
}
[data-theme="dark"] .plan-metric-btn:hover {
  background: #252848;
  border-color: var(--accent);
}
[data-theme="dark"] .plan-metric-btn.selected {
  background: #252848;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(157,150,245,0.18);
}
[data-theme="dark"] .plan-metric-btn .mb-desc { color: var(--ink-muted); }

/* Cards */
[data-theme="dark"] .card { background: var(--card); border-color: var(--border); }
[data-theme="dark"] .card-title { color: var(--ink-faint); }
[data-theme="dark"] .card-heading { color: var(--ink); }
[data-theme="dark"] .card-sub { color: var(--ink-muted); }

/* Form elements */
[data-theme="dark"] .field label { color: var(--ink-muted); }
[data-theme="dark"] .field input[type="number"],
[data-theme="dark"] .field input[type="text"],
[data-theme="dark"] .field select,
[data-theme="dark"] .variant-inputs input,
[data-theme="dark"] textarea {
  background: #0f1020;
  color: var(--ink);
  border-color: var(--border-strong);
}
[data-theme="dark"] .radio-group label {
  background: var(--pill-bg);
  border-color: var(--border-strong);
  color: var(--ink-muted);
}
[data-theme="dark"] .radio-group label:has(input:checked) {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* Notices */
[data-theme="dark"] .notice.info { background: var(--info-bg); border-left-color: var(--accent); color: #ccc8ff; }
[data-theme="dark"] .notice.warn { background: var(--warning-bg); border-left-color: var(--warning); color: #f7cf50; }
[data-theme="dark"] .notice.success { background: var(--success-bg); border-left-color: var(--success); color: var(--success); }
[data-theme="dark"] .notice strong { color: inherit; }

/* Result box (purple gradient — already good, minor tweak) */
[data-theme="dark"] .result-box { background: linear-gradient(135deg, #2a2060, #3d3393); }

/* Analysis result area */
[data-theme="dark"] .ar-header { background: var(--pill-bg); color: var(--ink); }
[data-theme="dark"] .ar-body { background: var(--card); }
[data-theme="dark"] .ar-sub { color: var(--ink-muted); }
[data-theme="dark"] .ar-stat strong { color: var(--ink); }
[data-theme="dark"] .ar-stat { color: var(--ink-muted); }

/* Tables */
[data-theme="dark"] .ref-table { border-color: var(--border); }
[data-theme="dark"] .ref-table th { background: var(--pill-bg); color: var(--ink-muted); border-color: var(--border); }
[data-theme="dark"] .ref-table td { border-color: var(--border); color: var(--ink); }
[data-theme="dark"] .ref-table tr:nth-child(even) { background: rgba(255,255,255,0.02); }

/* Accordions */
[data-theme="dark"] .accordion summary { background: var(--card); color: var(--ink); }
[data-theme="dark"] .accordion[open] summary { background: var(--pill-bg); }
[data-theme="dark"] .accordion-body { background: var(--card); color: var(--ink-muted); }
[data-theme="dark"] .accordion-body strong { color: var(--ink); }
[data-theme="dark"] .tip-row { border-bottom-color: var(--border); color: var(--ink-muted); }
[data-theme="dark"] .tip-row strong { color: var(--ink); }

/* Tab strip */
[data-theme="dark"] .tabs-wrap { background: var(--bg); }
[data-theme="dark"] .tabs-bar { background: var(--card); border-color: var(--border); }
[data-theme="dark"] .tab-btn { color: var(--ink-muted); }
[data-theme="dark"] .tab-btn:hover { background: var(--pill-bg); color: var(--ink); }

/* Upload zone */
[data-theme="dark"] .upload-zone { background: var(--pill-bg); border-color: var(--border-strong); color: var(--ink-muted); }
[data-theme="dark"] .upload-zone:hover,
[data-theme="dark"] .upload-zone.drag-over { background: #20223a; border-color: var(--accent); }
[data-theme="dark"] .upload-zone-label { color: var(--ink-muted); }

/* Code */
[data-theme="dark"] code { background: var(--pill-bg); color: #c4bfff; }

/* Disclosure */
[data-theme="dark"] .disclosure { background: var(--pill-bg); color: var(--ink-muted); }
[data-theme="dark"] .disclosure summary { color: var(--ink-muted); }
[data-theme="dark"] .disclosure ul li { color: var(--ink-muted); }
[data-theme="dark"] .disclosure strong { color: var(--ink); }

/* Variant rows */
[data-theme="dark"] .variant-tag { background: var(--pill-bg); color: var(--ink-muted); }
[data-theme="dark"] .variant-tag.control { background: var(--accent); color: #fff; }

/* Chart cards */
[data-theme="dark"] .chart-card { background: var(--card); border-color: var(--border); }
[data-theme="dark"] .chart-title { color: var(--ink); }
[data-theme="dark"] .chart-sub { color: var(--ink-muted); }

/* Buttons */
[data-theme="dark"] .btn-ghost { color: var(--ink-muted); border-color: var(--border-strong); }
[data-theme="dark"] .btn-ghost:hover { color: var(--accent); border-color: var(--accent); }

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

html { background: var(--bg); }
html[data-theme="dark"] { background: #0f1020; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Tabs pill strip ── */
.tabs-wrap {
  padding: 0 16px;
  margin-top: -26px;
  position: relative;
  z-index: 10;
  background: var(--bg);
  padding-bottom: 0;
}
.tabs-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.tabs-bar {
  background: var(--card);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow);
  display: flex;
  max-width: 520px;
  margin: 0 auto;
  padding: 5px;
  gap: 2px;
  border: 1px solid var(--border);
}
.tab-btn {
  background: none;
  border: none;
  padding: 9px 8px;
  font-family: 'Inter', sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--ink-muted);
  cursor: pointer;
  border-radius: var(--radius-pill);
  transition: background 0.15s, color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
  flex: 1;
  text-align: center;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.tab-icon { display: flex; align-items: center; flex-shrink: 0; }
.tab-label { overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 400px) {
  .tab-btn { font-size: 0.72rem; padding: 8px 4px; gap: 4px; }
  .tab-icon svg { width: 13px; height: 13px; }
}
.tab-btn:hover { color: var(--accent); background: var(--pill-bg); }
.tab-btn.active {
  background: var(--pill-active-bg);
  color: var(--pill-active-text);
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(91,80,200,0.3);
}

/* ── Bottom tab bar (mobile only ≤640px) ── */
.bottom-tab-bar {
  display: none; /* hidden by default; shown on mobile */
}
@media (max-width: 640px) {
  /* Hide the floating top tabs pill on mobile */
  .tabs-bar { display: none; }

  /* Show bottom bar */
  .bottom-tab-bar {
    display: flex;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 200;
    background: var(--card);
    border-top: 1px solid var(--border);
    box-shadow: 0 -2px 16px rgba(0,0,0,0.08);
    padding: 6px 0 max(6px, env(safe-area-inset-bottom));
  }
  .btab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    background: none;
    border: none;
    padding: 6px 4px;
    font-family: 'Inter', sans-serif;
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--ink-faint);
    cursor: pointer;
    transition: color 0.15s;
  }
  .btab svg { transition: stroke 0.15s; }
  .btab.active { color: var(--accent); }
  .btab.active svg { stroke: var(--accent); }
  .btab:hover { color: var(--accent); }
  [data-theme="dark"] .bottom-tab-bar {
    background: var(--card);
    border-top-color: var(--border);
  }

  /* Add bottom padding so content isn't hidden behind tab bar */
  main { padding-bottom: 80px !important; }
}

/* ── Main content ── */
.tab-panel { display: none; }
.tab-panel.active { display: block; }

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 80px;
}
#tab-analyse main { max-width: 1100px; }
#tab-reference main { max-width: 1280px; }

@media (min-width: 1024px) {
  main { padding: 32px 24px 96px; }
}

/* ── Cards ── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-card);
}
.card-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.card-heading {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}
.card-sub {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-bottom: 16px;
}

/* ── Plan tab desktop layout ── */
.plan-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.plan-steps { min-width: 0; }
.plan-result-col { min-width: 0; }

@media (min-width: 900px) {
  .plan-layout {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
  }
  .plan-result-col {
    position: sticky;
    top: 24px;
  }
  .plan-result-col .result-box {
    margin-top: 0;
  }
}
@media (min-width: 1200px) {
  .plan-layout {
    grid-template-columns: 3fr 2fr;
    gap: 32px;
  }
}

/* ── Hero value-prop pills ── */
.hero-props {
  display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 14px;
}
.hero-prop {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.82rem; color: rgba(255,255,255,0.92);
}
.hero-prop em { font-style: italic; opacity: 0.95; }
.hero-prop-ic {
  display: inline-flex; align-items: center; justify-content: center;
  width: 16px; height: 16px; border-radius: 50%;
  background: rgba(255,255,255,0.22); color: #fff;
  font-size: 0.62rem; font-weight: 700; flex-shrink: 0;
}

/* ── Plan empty state ── */
.plan-empty {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px 22px; text-align: center;
  color: var(--ink-faint);
}
.plan-empty-ic { font-size: 1.9rem; }
.plan-empty-t { font-weight: 600; color: var(--ink-muted); margin-top: 8px; font-size: 0.92rem; }
.plan-empty-s { font-size: 0.82rem; margin-top: 5px; line-height: 1.5; }

/* ── Method line inside the result card ── */
.result-method {
  margin-top: 16px; padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,0.2);
  font-size: 0.76rem; color: rgba(255,255,255,0.82); line-height: 1.45;
}
.result-method span[data-i18n] { font-weight: 700; color: #fff; }

/* ── "What this means" explain panel ── */
.plan-explain {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: var(--card);
}
.plan-explain-h {
  margin: 0 0 8px; font-size: 0.88rem; font-weight: 700;
  display: flex; align-items: center; gap: 7px; color: var(--ink);
}
.plan-explain-list {
  margin: 0; padding-left: 18px;
  font-size: 0.84rem; color: var(--ink-muted); line-height: 1.7;
}
.plan-explain-list b { color: var(--accent); }
.plan-explain-link {
  display: inline-block; margin-top: 12px;
  font-size: 0.82rem; font-weight: 600; color: var(--accent);
  text-decoration: none;
}
.plan-explain-link:hover { text-decoration: underline; }

/* ── Traffic allocation editor ── */
.alloc-toggle {
  display: inline-flex; gap: 0; margin-top: 4px;
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  overflow: hidden; background: var(--card);
}
.alloc-mode-btn {
  border: none; background: none; cursor: pointer;
  font-family: 'Inter', sans-serif; font-size: 0.82rem; font-weight: 600;
  color: var(--ink-muted); padding: 8px 18px; transition: background 0.15s, color 0.15s;
}
.alloc-mode-btn.selected { background: var(--accent); color: #fff; }
.alloc-editor { margin-top: 14px; }
.alloc-row {
  display: grid; grid-template-columns: 40px 1fr 96px; gap: 10px;
  align-items: center; margin-bottom: 8px;
}
.alloc-tag {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 9px;
  background: var(--pill-bg); color: var(--accent); font-weight: 700; font-size: 0.95rem;
}
.alloc-tag.control { background: var(--accent); color: #fff; }
.alloc-slider { width: 100%; accent-color: var(--accent); }
.alloc-pct-input {
  width: 100%; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 7px 8px; font-family: 'JetBrains Mono', monospace; text-align: center;
  font-size: 0.9rem; background: var(--card); color: var(--ink);
}
.alloc-sum-row {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--border);
  font-size: 0.85rem; color: var(--ink-muted); font-weight: 600;
}
.alloc-sum-ok { color: var(--success, #1a7a4a); font-family: 'JetBrains Mono', monospace; }
.alloc-sum-bad { color: var(--danger, #e11d48); font-family: 'JetBrains Mono', monospace; }
.alloc-warn {
  margin-top: 8px; font-size: 0.8rem; color: var(--danger, #e11d48);
  background: rgba(225,29,72,0.07); border-radius: var(--radius-sm); padding: 8px 12px;
}
/* per-arm breakdown table inside the result card */
.res-arms-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.res-arms-table td {
  padding: 5px 6px; font-size: 0.82rem; color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.15);
}
.res-arms-table tr:last-child td { border-bottom: none; }
.res-arms-table td:first-child { font-weight: 700; }
.res-arms-table td:nth-child(2) { opacity: 0.85; }
.res-arms-table td:last-child { text-align: right; font-family: 'JetBrains Mono', monospace; }
.res-arms-table tr.bottleneck td { color: #ffe08a; }
@media (max-width: 480px) {
  .alloc-row { grid-template-columns: 34px 1fr 78px; gap: 8px; }
}
/* ── SRM health-check banner (Analyse tab) ── */
.srm-banner {
  border-radius: var(--radius-sm); padding: 9px 13px; margin-bottom: 14px;
  font-size: 0.84rem; line-height: 1.45; font-weight: 500;
}
.srm-ok  { background: var(--success-bg, rgba(26,122,74,0.1)); color: var(--success, #1a7a4a); border: 1px solid rgba(26,122,74,0.25); }
.srm-bad { background: rgba(225,29,72,0.08); color: var(--danger, #e11d48); border: 1px solid rgba(225,29,72,0.3); font-weight: 600; }

/* ── Expected-split control that feeds the SRM check (Analyse sidebar) ── */
.srm-expected-block {
  margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--border);
}
.srm-expected-label {
  font-size: 0.82rem; font-weight: 600; color: var(--ink-muted);
  margin-bottom: 8px;
}
.srm-expected-label .tip { font-weight: 400; opacity: 0.8; }
.srm-toggle .alloc-mode-btn { padding: 6px 14px; font-size: 0.78rem; }
.srm-editor { margin-top: 12px; }
.srm-hint {
  font-size: 0.78rem; color: var(--ink-muted); line-height: 1.45;
  margin-bottom: 10px;
}

/* ── Case studies ── */
.case-card {
  border: 1px solid var(--border); border-radius: var(--radius);
  margin: 12px 0; background: var(--card); overflow: hidden;
}
.case-card summary {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px; cursor: pointer; list-style: none;
  font-weight: 600; color: var(--ink);
}
.case-card summary::-webkit-details-marker { display: none; }
.case-card summary::after {
  content: '▸'; margin-left: auto; color: var(--accent);
  font-size: 0.9rem; transition: transform 0.2s; flex-shrink: 0;
}
.case-card[open] summary::after { transform: rotate(90deg); }
.case-card[open] summary { border-bottom: 1px solid var(--border); }
.case-emoji { font-size: 1.3rem; flex-shrink: 0; }
.case-sum-title { font-size: 0.95rem; }
.case-tags { display: inline-flex; gap: 5px; margin-left: 6px; flex-wrap: wrap; }
.case-pill {
  font-size: 0.6rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em;
  padding: 3px 8px; border-radius: 100px; background: var(--pill-bg); color: var(--accent);
}
.case-pill.metric { background: #e7f4ee; color: #1a7a4a; }
.case-pill.metric.cont { background: #fdf3e3; color: #b06a00; }
.case-pill.metric.ratio { background: #ece9fb; color: #5b50c8; }
.case-body { padding: 8px 16px 16px; }
.case-stage { border-left: 3px solid var(--accent); padding: 6px 0 6px 14px; margin: 12px 0; }
.case-stage.result { border-color: #1a7a4a; }
.case-stage.pitfall { border-color: #b06a00; }
.case-stage.hypothesis { border-color: var(--accent); background: rgba(91,95,233,0.05); border-radius: 0 6px 6px 0; padding-right: 12px; }
.case-stage.hypothesis .case-lbl { color: var(--accent); }
.case-stage.hypothesis p strong { color: var(--ink); }
.case-lbl {
  font-size: 0.64rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--accent); display: block; margin-bottom: 3px;
}
.case-stage.result .case-lbl { color: #1a7a4a; }
.case-stage.pitfall .case-lbl { color: #b06a00; }
.case-stage p { margin: 0; font-size: 0.88rem; line-height: 1.55; color: var(--ink-muted); }
.case-stage p em { font-style: italic; color: var(--ink); }
.case-graph { background: var(--bg, #f7f7fc); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; margin: 10px 0 2px; }
.case-cap { font-size: 0.74rem; color: var(--ink-faint); text-align: center; margin-top: 4px; line-height: 1.4; }
.case-verdict {
  display: flex; gap: 10px; align-items: flex-start;
  background: rgba(26,122,74,0.08); border-radius: 10px;
  padding: 11px 13px; margin: 12px 0; font-size: 0.88rem; color: var(--ink);
}
.case-verdict.no { background: var(--amber-bg, #fdf3e3); }
.case-verdict strong { color: var(--ink); }
.case-take {
  font-size: 0.84rem; color: var(--ink-muted); font-style: italic;
  border-top: 1px dashed var(--border); padding-top: 10px; margin-top: 12px;
}
@media (max-width: 480px) {
  .case-tags { width: 100%; margin-left: 0; margin-top: 4px; }
  .case-card summary { flex-wrap: wrap; }
}

/* ── Revenue projection card ── */
.revenue-card {
  margin-top: 16px;
  background: linear-gradient(135deg, rgba(91,80,200,0.05) 0%, rgba(26,122,74,0.05) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px 14px;
}
.revenue-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
  margin-bottom: 12px;
}
.revenue-cols {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}
.rev-col { text-align: center; }
.rev-col-mid { border-left: 1px solid var(--border); border-right: 1px solid var(--border); }
.rev-val { font-family: 'JetBrains Mono', monospace; font-size: 1.1rem; font-weight: 700; }
.rev-lo  { color: var(--ink-muted); }
.rev-mid { color: var(--success); font-size: 1.3rem; }
.rev-hi  { color: var(--accent); }
.rev-label { font-size: 0.72rem; color: var(--ink-muted); margin-top: 3px; }
.rev-note { font-size: 0.75rem; color: var(--ink-faint); border-top: 1px solid var(--border); padding-top: 8px; }
[data-theme="dark"] .revenue-card { background: rgba(91,80,200,0.09); }

/* ── Callout box (used in normality explainer) ── */
.callout-box {
  background: var(--success-bg);
  border-left: 4px solid var(--success);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 12px 0;
}
.callout-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--success);
  margin-bottom: 4px;
}
.callout-box p { font-size: 0.85rem; color: var(--ink-muted); line-height: 1.55; }

/* ── Interactive FWER formula box ── */
.fwer-formula {
  margin: 12px 0 4px;
  padding: 12px 16px;
  background: linear-gradient(135deg, rgba(91,80,200,0.08), rgba(232,131,42,0.06));
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.fwer-formula-label {
  font-size: 0.68rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--ink-muted);
}
.fwer-eq {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.92rem; color: var(--ink); font-weight: 600;
  line-height: 1.5;
}
.fwer-hl {
  background: rgba(91,80,200,0.16);
  color: var(--accent);
  padding: 0 4px; border-radius: 4px; font-weight: 700;
}
.fwer-result {
  background: var(--accent); color: #fff;
  padding: 1px 8px; border-radius: 5px; font-weight: 700;
  transition: background 0.2s;
}

/* ── Beginner glossary ── */
.glossary { display: flex; flex-direction: column; gap: 2px; }
.gloss-item {
  padding: 14px 0;
  border-top: 1px solid var(--border);
}
.gloss-item:first-child { border-top: none; padding-top: 2px; }
.gloss-term {
  display: flex; align-items: center; gap: 9px;
  font-size: 0.98rem; font-weight: 700; color: var(--ink);
  margin-bottom: 6px;
}
.gloss-emoji { font-size: 1.15rem; line-height: 1; flex-shrink: 0; }
.gloss-def { font-size: 0.86rem; color: var(--ink-muted); line-height: 1.6; }
.gloss-def strong { color: var(--ink); }
.gloss-eg {
  margin-top: 8px; padding: 9px 13px;
  background: var(--pill-bg); border-radius: var(--radius-sm);
  font-size: 0.82rem; color: var(--ink-muted); line-height: 1.55;
}
.gloss-eg strong { color: var(--accent); }

/* ── Type I/II definitions under the errors chart (single home for the concept) ── */
.errors-defs { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.errors-def-row {
  display: flex; flex-direction: column; gap: 4px;
  font-size: 0.86rem; color: var(--ink-muted); line-height: 1.55;
}
.errors-def-tag {
  align-self: flex-start; font-size: 0.74rem; font-weight: 700;
  letter-spacing: 0.02em; padding: 3px 10px; border-radius: var(--radius-pill);
}
.errors-def-1 { background: rgba(225,29,72,0.1); color: var(--danger, #e11d48); }
.errors-def-2 { background: rgba(100,116,139,0.14); color: var(--ink); }
.errors-eg {
  margin-top: 2px; padding: 9px 13px;
  background: var(--pill-bg); border-radius: var(--radius-sm);
  font-size: 0.82rem; color: var(--ink-muted); line-height: 1.55;
}
.errors-eg strong { color: var(--accent); }

/* ── Case study block ── */
.case-study {
  margin-top: 16px;
  background: var(--info-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}
.case-study-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 4px;
}
.case-study-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}
.case-study p { font-size: 0.85rem; color: var(--ink-muted); line-height: 1.6; margin-bottom: 10px; }
.cs-step {
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.6;
  padding: 8px 0;
  border-top: 1px solid var(--border);
}
.cs-step strong { color: var(--ink); }
.cs-takeaway {
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--success-bg);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.6;
}
.cs-takeaway strong { color: var(--success); }

/* ── CUPED deep-dive: numbered steps, comparison table, pipeline, code block ── */
.dd-step { display:flex; gap:11px; margin:11px 0; align-items:flex-start; font-size:0.86rem; color:var(--ink-muted); line-height:1.55; }
.dd-step .dd-n { flex-shrink:0; width:26px; height:26px; border-radius:7px; background:var(--accent); color:#fff; font-weight:700; font-size:.82rem; display:flex; align-items:center; justify-content:center; }
.dd-step strong { color:var(--ink); }
.dd-h3 { font-size:0.98rem; font-weight:700; color:var(--accent); margin:18px 0 6px; }

.cmp-table { border-collapse:collapse; width:100%; margin:12px 0; font-size:0.86rem; }
.cmp-table th, .cmp-table td { border:1px solid var(--border); padding:7px 11px; text-align:left; }
.cmp-table th { background:var(--pill-bg); font-weight:700; }
.cmp-table td:nth-child(2), .cmp-table th:nth-child(2) { background:rgba(225,29,72,0.05); }
.cmp-table td:nth-child(3), .cmp-table th:nth-child(3) { background:rgba(5,150,105,0.06); }
.cmp-table .mean-row td { font-weight:700; background:var(--pill-bg) !important; border-top:2px solid var(--accent); }
[data-theme="dark"] .cmp-table td:nth-child(2), [data-theme="dark"] .cmp-table th:nth-child(2) { background:rgba(225,29,72,0.12); }
[data-theme="dark"] .cmp-table td:nth-child(3), [data-theme="dark"] .cmp-table th:nth-child(3) { background:rgba(5,150,105,0.14); }

.verdict-table { border-collapse:collapse; width:100%; margin:12px 0; font-size:0.85rem; }
.verdict-table th, .verdict-table td { border:1px solid var(--border); padding:7px 11px; text-align:left; }
.verdict-table th { background:var(--pill-bg); }
.vt-before { color:var(--danger,#e11d48); font-weight:700; }
.vt-after { color:var(--success,#059669); font-weight:700; }

.whatchanged { background:var(--card,#fff); border:1px solid var(--border); border-radius:var(--radius-md); padding:14px 16px; margin-top:12px; }
.whatchanged > strong { color:var(--ink); }
.whatchanged ol { margin:6px 0; padding-left:20px; font-size:0.85rem; color:var(--ink-muted); line-height:1.55; }
.whatchanged li { margin:7px 0; }
.whatchanged li strong { color:var(--ink); }

.pl-phase { background:var(--card,#fff); border:1px solid var(--border); border-left:4px solid var(--accent); border-radius:var(--radius-sm); padding:12px 16px; margin:10px 0; font-size:0.86rem; }
.pl-phase ol { margin:8px 0 2px; padding-left:20px; color:var(--ink-muted); line-height:1.55; }
.pl-phase li { margin:6px 0; }
.pl-phase li strong { color:var(--ink); }
.pl-when { display:inline-block; font-size:.7rem; font-weight:800; letter-spacing:.04em; color:var(--accent); background:var(--pill-bg); padding:2px 9px; border-radius:var(--radius-pill); margin-right:6px; text-transform:uppercase; }
.pl-phase-title { font-weight:700; color:var(--ink); }

.dd-limit { background:rgba(217,119,6,0.07); border:1px solid rgba(217,119,6,0.25); border-radius:var(--radius-sm); padding:10px 13px; margin:9px 0; font-size:0.85rem; color:var(--ink-muted); line-height:1.55; }
.dd-limit b { color:var(--warn,#D97706); }

/* Reusable code block with copy button */
.code-block { position:relative; margin:12px 0; }
.code-block pre {
  background:#1e2233; color:#e6e8f5; padding:16px 18px; border-radius:var(--radius-sm);
  overflow-x:auto; font-size:0.78rem; line-height:1.55; font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;
  margin:0; -webkit-overflow-scrolling:touch;
}
.code-block .code-copy {
  position:absolute; top:8px; right:8px; background:rgba(255,255,255,0.1); color:#e6e8f5;
  border:1px solid rgba(255,255,255,0.2); border-radius:6px; padding:4px 10px; font-size:0.72rem;
  font-weight:600; cursor:pointer; transition:background 0.15s;
}
.code-block .code-copy:hover { background:rgba(255,255,255,0.2); }
.code-block .code-copy.copied { background:var(--success,#059669); border-color:var(--success,#059669); }
.tok-c { color:#8b93b8; font-style:italic; }   /* comment */
.tok-k { color:#c792ea; }                        /* keyword */
.tok-s { color:#c3e88d; }                        /* string */
.tok-n { color:#f78c6c; }                        /* number */
.tok-f { color:#82aaff; }                        /* function */
.tok-b { color:#ffcb6b; }                        /* builtin/module */
.cs-chart-wrap {
  width: 100%;
  height: 130px;
  position: relative;
  margin: 10px 0 4px;
  border-radius: var(--radius-sm);
}
.cs-chart-wrap canvas {
  display: block;
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
}
/* ── Distribution anatomy blocks ── */
.anat-block { padding: 14px 0; border-top: 1px solid var(--border); }
.anat-block:first-of-type { border-top: none; padding-top: 4px; }
.anat-h {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}
.anat-block p {
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.6;
  margin-top: 8px;
}
.anat-block p strong { color: var(--ink); }
.anat-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 8px 0 2px;
  font-size: 0.76rem;
  color: var(--ink-muted);
}
.anat-legend-item { display: inline-flex; align-items: center; gap: 6px; }
.anat-legend-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

/* ── Interactive A/B process stepper ── */
.process-track {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}
.process-step {
  flex: 1 1 0;
  min-width: 86px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 6px;
  background: var(--pill-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.12s;
  text-align: center;
}
.process-step:hover { transform: translateY(-2px); border-color: var(--accent); }
.process-step.active { background: var(--accent); border-color: var(--accent); }
.process-step.active .process-step-num,
.process-step.active .process-step-label { color: #fff; }
.process-step.active .process-step-emoji { filter: none; transform: scale(1.1); }
.process-step-emoji { font-size: 1.3rem; line-height: 1; transition: transform 0.15s; }
.process-step-num {
  font-size: 0.62rem; font-weight: 700; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--ink-faint);
}
.process-step-label { font-size: 0.72rem; font-weight: 600; color: var(--ink-muted); line-height: 1.25; }
.process-progress {
  height: 4px; background: var(--border); border-radius: 100px; overflow: hidden; margin-bottom: 16px;
}
.process-progress-bar {
  height: 100%; width: 0%; background: var(--accent);
  border-radius: 100px; transition: width 0.3s ease;
}
.process-panel {
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  background: var(--card);
}
.process-panel-title { font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 4px; display: flex; align-items: center; gap: 8px; }
.process-panel-goal { font-size: 0.78rem; color: var(--accent); font-weight: 600; margin-bottom: 10px; }
.process-panel-body { font-size: 0.86rem; color: var(--ink-muted); line-height: 1.6; }
.process-panel-body strong { color: var(--ink); }
.process-example {
  margin-top: 12px; padding: 10px 14px;
  background: var(--pill-bg); border-radius: var(--radius-sm);
  font-size: 0.82rem; color: var(--ink-muted); line-height: 1.5;
}
.process-example strong { color: var(--accent); }
.process-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 14px; }
.process-nav button {
  flex: 1; padding: 9px 14px; border-radius: var(--radius-pill);
  border: 1px solid var(--border); background: var(--card);
  font-family: 'Inter', sans-serif; font-size: 0.8rem; font-weight: 600;
  color: var(--ink); cursor: pointer; transition: background 0.15s, opacity 0.15s;
}
.process-nav button:hover:not(:disabled) { background: var(--pill-bg); }
.process-nav button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.process-nav button:disabled { opacity: 0.4; cursor: default; }
@media (max-width: 560px) {
  .process-step { min-width: calc(33.33% - 6px); flex: 0 0 calc(33.33% - 6px); }
}


/* ── Sticky verdict bar (mobile only) ── */
@media (max-width: 640px) {
  .ar-sticky-verdict {
    position: sticky;
    bottom: 0;
    z-index: 100;
    background: var(--card);
    border-top: 2px solid var(--border);
    padding: 10px 16px;
    display: flex;
    align-items: baseline;
    gap: 10px;
    box-shadow: 0 -4px 16px rgba(0,0,0,0.07);
    margin: 0 -20px;
  }
  .ar-sticky-verdict .ar-verdict { font-size: 1rem; margin: 0; }
  .ar-sticky-verdict .ar-sub { font-size: 0.75rem; }
}
@media (min-width: 641px) {
  .ar-sticky-verdict { display: none; }
}

/* ── Revenue inputs toggle ── */
.revenue-inputs > summary { list-style: none; }
.revenue-inputs > summary::-webkit-details-marker { display: none; }

.plan-metric-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  background: var(--pill-bg);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  text-align: left;
}
.plan-metric-btn:hover { border-color: var(--accent); background: var(--accent-hover-bg, #f0effc); }
.plan-metric-btn.selected {
  border-color: var(--accent);
  background: #f0effc;
  box-shadow: 0 0 0 3px rgba(91,80,200,0.12);
}
.plan-metric-badge {
  flex-shrink: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: #fff;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.plan-metric-btn.selected .plan-metric-badge { background: var(--purple-dark); }


.metric-groups { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }

.metric-group {
  background: var(--pill-bg);
  border-radius: var(--radius-md);
  padding: 12px 14px 14px;
  border: 2px solid transparent;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}
.metric-group-selectable { cursor: pointer; }
.metric-group-selectable:hover { border-color: var(--accent); background: var(--accent-hover-bg, #f0effc); }
.metric-group-selectable.selected {
  border-color: var(--accent);
  background: var(--accent-hover-bg, #f0effc);
  box-shadow: 0 0 0 3px rgba(91,80,200,0.12);
}
.metric-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}
.metric-group-label {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.metric-group-selectable.selected .metric-group-label { color: var(--accent); }
.metric-group-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--border-strong);
  color: var(--ink-muted);
  white-space: nowrap;
  flex-shrink: 0;
}
.metric-group-selectable.selected .metric-group-badge { background: var(--accent); color: #fff; }
.metric-chips { display: flex; flex-wrap: wrap; gap: 6px; }

/* Example spans inside groups — informational, not clickable */
.metric-chip-ex {
  display: inline-block;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 5px 12px;
  font-size: 0.8rem;
  color: var(--ink-muted);
  white-space: nowrap;
  user-select: none;
  pointer-events: none;
}
.metric-group-selectable.selected .metric-chip-ex {
  border-color: rgba(91,80,200,0.3);
  color: var(--accent);
  background: rgba(91,80,200,0.06);
}

/* Clickable chips (plan tab two-btn uses .plan-metric-btn; kept for any legacy use) */
.metric-chip {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 8px 16px;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s, background 0.12s, box-shadow 0.12s;
  white-space: nowrap;
}
.metric-chip:hover { border-color: var(--accent); color: var(--accent); }
.metric-chip.selected {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--card);
  box-shadow: 0 0 0 2px rgba(91,80,200,0.15);
  font-weight: 600;
}

/* ── Disclosure / examples ── */
.disclosure {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--info-bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--border-strong);
}
.disclosure summary {
  font-size: 0.8rem;
  color: var(--ink-muted);
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.disclosure summary::before { content: '▸'; font-size: 0.7rem; transition: transform 0.15s; }
.disclosure[open] summary::before { transform: rotate(90deg); }
.disclosure ul { margin-top: 8px; padding-left: 16px; }
.disclosure li { font-size: 0.8rem; color: var(--ink-muted); margin-bottom: 3px; line-height: 1.5; }

/* ── Notice ── */
.notice {
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: 0.82rem;
  line-height: 1.55;
  margin-top: 12px;
}
.notice.warn { background: var(--warning-bg); border-left: 3px solid #e8a020; color: var(--warning); }
.notice.info { background: var(--info-bg); border-left: 3px solid var(--accent); color: var(--ink); }
.notice.success { background: var(--success-bg); border-left: 3px solid #2db86a; color: var(--success); }
.notice strong { font-weight: 600; }

/* ── Form ── */
.form-row { display: grid; gap: 12px; margin-bottom: 12px; }
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }
.form-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; }

.field label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 5px;
}
.field label .tip {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink-faint);
  font-size: 0.72rem;
}
.field input[type="number"],
.field input[type="text"],
.field select {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  background: #fff;
  color: var(--ink);
  transition: border-color 0.15s, box-shadow 0.15s;
  -moz-appearance: textfield;
}
.field input[type="number"]:focus,
.field input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91,80,200,0.1);
}
.field input::-webkit-outer-spin-button,
.field input::-webkit-inner-spin-button { -webkit-appearance: none; }

/* ── Pill radio group ── */
.radio-group { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }
.radio-group label {
  display: flex;
  align-items: center;
  padding: 6px 14px;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--ink-muted);
  background: #fff;
  transition: all 0.12s;
}
.radio-group label:hover { border-color: var(--accent); color: var(--accent); }
.radio-group input[type="radio"] { display: none; }
.radio-group label:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

/* ── Buttons ── */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-pill);
  padding: 12px 28px;
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: 0 2px 8px rgba(91,80,200,0.25);
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 16px rgba(91,80,200,0.35); }
.btn-primary:active { transform: scale(0.98); }

.btn-ghost {
  background: var(--pill-bg);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-pill);
  padding: 7px 16px;
  font-family: 'Inter', sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--ink-muted);
  cursor: pointer;
  transition: all 0.12s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ── Result box (Plan) ── */
.result-box {
  background: linear-gradient(135deg, var(--purple-dark), var(--purple-mid));
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-top: 4px;
  color: #fff;
}
.result-box.hidden { display: none; }
.result-label { font-size: 0.78rem; font-weight: 600; opacity: 0.7; text-transform: uppercase; letter-spacing: 0.07em; margin-bottom: 6px; }
.result-number { font-size: 3rem; font-weight: 700; line-height: 1; letter-spacing: -0.03em; }
.result-unit { font-size: 1rem; opacity: 0.7; margin-left: 6px; }
.result-meta { display: flex; gap: 24px; margin-top: 16px; flex-wrap: wrap; }
.result-meta-item { font-size: 0.82rem; opacity: 0.8; }
.result-meta-item strong { display: block; font-size: 0.92rem; opacity: 1; font-weight: 600; color: #fff; }

/* ── Analyse two-column layout ── */
.analyse-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  align-items: start;
}
.analyse-sidebar { position: sticky; top: 20px; }
.analyse-sidebar .card { margin-bottom: 0; }
.analyse-main { min-width: 0; }

@media (min-width: 1200px) {
  .analyse-layout { grid-template-columns: 360px 1fr; gap: 24px; }
}

/* ── Variant rows ── */
.variant-row {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 8px;
  align-items: start;
  margin-bottom: 10px;
}
.variant-tag {
  padding: 10px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
  background: var(--pill-bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--ink-muted);
}
.variant-tag.control { background: var(--accent); color: #fff; border-color: var(--accent); }
.variant-inputs { display: flex; gap: 8px; }
.variant-inputs input {
  width: 100%;
  padding: 10px 10px;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.84rem;
  background: #fff;
  color: var(--ink);
  transition: border-color 0.15s;
}
.variant-inputs input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(91,80,200,0.1); }
.variant-inputs .vi-field { flex: 1; }
.variant-inputs .vi-field label { font-size: 0.7rem; font-weight: 600; color: var(--ink-faint); display: block; margin-bottom: 3px; text-transform: uppercase; letter-spacing: 0.05em; }
.btn-remove {
  background: none; border: none; color: var(--ink-faint);
  cursor: pointer; font-size: 1.1rem; padding: 8px 2px; line-height: 1;
  margin-top: 20px; transition: color 0.12s;
}
.btn-remove:hover { color: #e05050; }

/* ── Analysis result ── */
.analysis-result { margin-top: 16px; border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow-card); }
.analysis-result.hidden { display: none; }
.ar-header {
  background: var(--pill-bg);
  padding: 12px 20px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  border-bottom: 1px solid var(--border);
}
.ar-body { padding: 20px; background: var(--card); }
.ar-verdict { font-size: 1.3rem; font-weight: 700; margin-bottom: 6px; letter-spacing: -0.01em; }
.best-variant-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 10px 14px;
  background: var(--success-bg, rgba(26,122,74,0.1));
  border: 1px solid var(--success, #1a7a4a);
  border-left: 4px solid var(--success, #1a7a4a);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--success, #1a7a4a);
  font-weight: 600;
}
.ar-verdict.sig   { color: var(--success); }
.ar-verdict.worse { color: var(--warning); }
.ar-verdict.insig { color: var(--ink-muted); }
.ar-sub { font-size: 0.82rem; color: var(--ink-muted); }
.ar-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 16px 20px;
  margin-top: 16px;
}
.ar-stat {
  font-size: 0.8rem;
  color: var(--ink-muted);
  line-height: 1.4;
}
.ar-stat strong {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  color: var(--ink);
  display: block;
  font-weight: 600;
  margin-bottom: 2px;
}

/* ── Reference ── */
.accordion {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 10px;
  box-shadow: var(--shadow-card);
}
.accordion summary {
  padding: 14px 18px;
  background: var(--card);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.12s;
}
.accordion summary:hover { background: var(--pill-bg); }
.accordion summary::after { content: '+'; font-size: 1.1rem; color: var(--ink-muted); font-weight: 400; }
.accordion[open] summary { background: var(--pill-bg); }
.accordion[open] summary::after { content: '−'; }
.accordion-body {
  padding: 16px 18px;
  background: var(--card);
  border-top: 1px solid var(--border);
}
.accordion-body p { font-size: 0.85rem; color: var(--ink-muted); line-height: 1.65; margin-bottom: 8px; }
.accordion-body ul { padding-left: 18px; margin-bottom: 8px; }
.accordion-body li { font-size: 0.85rem; color: var(--ink-muted); margin-bottom: 4px; line-height: 1.5; }
.accordion-body code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  background: var(--pill-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}
/* Tip rows inside accordion */
.accordion-body .tip-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.84rem;
  color: var(--ink-muted);
  line-height: 1.55;
}
.accordion-body .tip-row:last-child { border-bottom: none; }
.accordion-body .tip-row .tip-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }
.accordion-body .tip-row strong { color: var(--ink); }

.ref-table { width: 100%; border-collapse: collapse; font-size: 0.8rem; margin-top: 8px; }
.ref-table th {
  text-align: left; padding: 9px 12px;
  background: var(--pill-bg);
  border: 1px solid var(--border);
  font-weight: 700; color: var(--ink-muted);
  text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.72rem;
}
.ref-table td {
  padding: 9px 12px;
  border: 1px solid var(--border);
  color: var(--ink-muted);
  vertical-align: top;
  font-size: 0.82rem;
}
.ref-table td:first-child { color: var(--ink); font-weight: 500; }

/* ── Utilities ── */
.hidden { display: none !important; }
.mt-8  { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.flex-end { display: flex; justify-content: flex-end; }
.divider { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

/* ── Mobile ── */
@media (max-width: 780px) {
  .analyse-layout { grid-template-columns: 1fr; }
  .analyse-sidebar { position: static; }
}
@media (max-width: 560px) {
  .site-header { padding: 16px 14px 48px; }
  .tabs-wrap { padding: 0 12px; margin-top: -24px; }
  .tab-btn { font-size: 0.8rem; padding: 9px 8px; }
  main { padding: 20px 12px 60px; }
  .metric-choice { grid-template-columns: 1fr; }
  .form-row.cols-2, .form-row.cols-3 { grid-template-columns: 1fr; }
  .result-meta { gap: 14px; }
  .chart-wrap { height: 240px; }
  .res-chart-grid .chart-wrap { height: 240px !important; }
}
/* ── Excel upload ── */
.upload-zone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  background: var(--pill-bg);
  margin-bottom: 12px;
  position: relative;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent);
  background: #f0effc;
}
.upload-zone input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}
.upload-zone-icon { font-size: 1.4rem; margin-bottom: 4px; }
.upload-zone-label { font-size: 0.82rem; font-weight: 600; color: var(--ink-muted); display: block; }
.upload-zone-hint { font-size: 0.72rem; color: var(--ink-faint); margin-top: 2px; }
.upload-status { font-size: 0.78rem; margin-top: 6px; padding: 6px 10px; border-radius: var(--radius-sm); }
.upload-status.ok { background: var(--success-bg); color: var(--success); }
.upload-status.err { background: var(--warning-bg); color: var(--warning); }

/* ── Inline validation message (replaces alert pop-ups) ── */
.inline-msg {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  background: var(--warning-bg);
  border: 1px solid var(--warning);
  border-left: 3px solid var(--warning);
  color: var(--warning);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.4;
  margin-top: 12px;
}
.inline-msg-icon { flex-shrink: 0; font-size: 0.95rem; }

/* ── Recent results panel ── */
.btn-ghost-sm {
  background: none;
  border: 1px solid var(--border);
  color: var(--ink-muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.74rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.btn-ghost-sm:hover { background: var(--pill-bg); color: var(--accent); }
.recent-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  overflow: hidden;
}
.recent-item-summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  cursor: pointer;
  list-style: none;
}
.recent-item-summary::-webkit-details-marker { display: none; }
.recent-item-summary::after {
  content: '▾';
  flex-shrink: 0;
  color: var(--ink-faint);
  font-size: 0.7rem;
  transition: transform 0.15s;
}
.recent-item[open] .recent-item-summary::after { transform: rotate(180deg); }
.recent-item-summary:hover { background: var(--pill-bg); }
.recent-item-dot {
  flex-shrink: 0;
  width: 8px; height: 8px;
  border-radius: 50%;
}
.recent-item-main { flex: 1; min-width: 0; }
.recent-item-verdict { font-size: 0.84rem; font-weight: 600; color: var(--ink); }
.recent-item-meta { font-size: 0.72rem; color: var(--ink-muted); margin-top: 1px; }
.recent-item-time { font-size: 0.7rem; color: var(--ink-faint); flex-shrink: 0; }
.recent-item-inputs {
  padding: 4px 12px 12px 30px;
  border-top: 1px solid var(--border);
  background: var(--pill-bg);
}
.recent-input-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.74rem;
  padding: 4px 0;
}
.recent-input-k { color: var(--ink-muted); font-weight: 600; flex-shrink: 0; }
.recent-input-v { color: var(--ink); text-align: right; font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; }

/* ── Horizontal scroll hint for wide result tables (mobile) ── */
.scroll-x {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  position: relative;
  background:
    linear-gradient(to right, var(--card) 30%, rgba(255,255,255,0)) left center,
    linear-gradient(to left, var(--card) 30%, rgba(255,255,255,0)) right center;
  background-repeat: no-repeat;
  background-size: 24px 100%, 24px 100%;
  background-attachment: local, local;
}
[data-theme="dark"] .scroll-x {
  background:
    linear-gradient(to right, var(--card) 30%, rgba(22,24,40,0)) left center,
    linear-gradient(to left, var(--card) 30%, rgba(22,24,40,0)) right center;
  background-repeat: no-repeat;
  background-size: 24px 100%, 24px 100%;
  background-attachment: local, local;
}

/* ── Result chart grid ── */
.res-chart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}
@media (max-width: 640px) {
  .res-chart-grid { grid-template-columns: 1fr; gap: 12px; }
}
@media (min-width: 1024px) {
  .res-chart-grid { gap: 20px; }
  .res-chart-grid .chart-wrap { height: 240px !important; }
}

/* ── Charts ── */
.chart-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px 16px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-card);
  position: relative;
}
.chart-dl {
  position: absolute;
  top: 14px; right: 14px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--pill-bg);
  border: 1px solid var(--border);
  color: var(--ink-muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  z-index: 2;
}
.chart-dl:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.chart-dl svg { width: 13px; height: 13px; }
.chart-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
  padding-right: 80px; /* reserve room for the PNG button so text never runs under it */
}
.chart-sub {
  font-size: 0.78rem;
  color: var(--ink-muted);
  margin-bottom: 14px;
  line-height: 1.5;
}

/* ── Reference sidebar TOC layout ── */
.ref-layout { display: block; }
.ref-content { min-width: 0; }

.toc-sidebar-title {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--ink);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.toc-group-h {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin: 14px 0 4px;
}
.toc-group-h:first-of-type { margin-top: 0; }
.toc-group-desc {
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--ink-faint);
  margin: 0 0 8px;
  padding-right: 4px;
}
/* ── Z-vs-t "choosing your test" blocks ── */
.choose-block {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 12px 0;
  background: var(--pill-bg);
}
.choose-head {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.95rem; font-weight: 700; color: var(--ink);
  margin-bottom: 10px;
}
.choose-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.55;
  padding: 6px 0;
  border-top: 1px solid var(--border);
}
.choose-row:first-of-type { border-top: none; }
.choose-tag {
  font-size: 0.68rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--accent);
  padding-top: 2px;
}
.choose-row em { color: var(--ink); font-style: italic; }
@media (max-width: 520px) {
  .choose-row { grid-template-columns: 1fr; gap: 2px; }
}
.toc-nav { display: flex; flex-direction: column; }
.toc-link {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.8rem;
  color: var(--ink-muted);
  text-decoration: none;
  padding: 7px 11px;
  line-height: 1.3;
  border-radius: 9px;
  border-left: 2px solid transparent;
  position: relative;
  transition: background 0.18s, color 0.18s, border-color 0.18s, transform 0.12s;
}
.toc-link .toc-emoji {
  flex-shrink: 0;
  font-size: 0.95rem;
  width: 20px;
  text-align: center;
  transition: transform 0.18s;
  filter: grayscale(0.35);
  opacity: 0.8;
}
.toc-link:hover {
  background: var(--pill-bg);
  color: var(--ink);
  transform: translateX(2px);
}
.toc-link:hover .toc-emoji { filter: grayscale(0); opacity: 1; transform: scale(1.12); }
.toc-link.active {
  background: var(--pill-bg);
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 14%, transparent), transparent);
  color: var(--accent);
  font-weight: 700;
  border-left-color: var(--accent);
}
.toc-link.active .toc-emoji { filter: grayscale(0); opacity: 1; transform: scale(1.12); }
.toc-mobile-toggle { display: none; }
.toc-chevron { width: 16px; height: 16px; transition: transform 0.2s; }

/* anchored sections shouldn't hide under sticky chrome when jumped to */
[id^="sec-"] { scroll-margin-top: 24px; }

/* Desktop: two-column with a sticky sidebar that stays in view while scrolling */
@media (min-width: 1024px) {
  .ref-layout {
    display: grid;
    grid-template-columns: 248px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
  /* The grid child itself is the sticky element and must self-align to start
     so its height equals its content (otherwise it stretches and can't stick). */
  .toc-sidebar {
    position: sticky;
    top: 24px;
    align-self: start;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px 16px;
    box-shadow: var(--shadow-card);
  }
  .toc-sidebar-inner { padding: 0; }
}

/* Tablet & mobile: collapsible TOC card at the top */
@media (max-width: 1023px) {
  .toc-sidebar {
    background: var(--card);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    margin-bottom: 16px;
    overflow: hidden;
  }
  .toc-sidebar-inner { padding: 0; }
  .toc-sidebar-title { display: none; }
  .toc-mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: none;
    border: none;
    padding: 16px 18px;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--ink);
    cursor: pointer;
  }
  .toc-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 12px;
  }
  /* Open: expand tall enough for the full list; scroll internally if it ever exceeds the viewport */
  .toc-sidebar.open .toc-nav {
    max-height: 75vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 12px 14px;
  }
  .toc-sidebar.open .toc-chevron { transform: rotate(180deg); }
  [id^="sec-"] { scroll-margin-top: 16px; }
}

/* PNG button: shrink to icon-only on mobile so it never overlaps the title */
@media (max-width: 640px) {
  .chart-dl { padding: 5px 8px; top: 12px; right: 12px; }
  .chart-dl .dl-label { display: none; }
  .chart-dl svg { width: 15px; height: 15px; }
  .chart-title { padding-right: 44px; }
}
.chart-wrap {
  width: 100%;
  height: 200px;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  display: block;
}
.chart-wrap canvas {
  display: block;
  position: absolute;
  top: 0; left: 0;
  width: 100% !important;
  height: 100% !important;
}
canvas.chart { width: 100% !important; height: 100% !important; display: block; }