/* ==========================================================================
   RUCF — Real User Cost Framework
   One stylesheet, no framework. Tokens first, components after.
   ========================================================================== */

:root {
  --font-display: "Google Sans Flex", "Google Sans Text", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-text: "Google Sans Text", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-code: "Google Sans Code", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: dark;
  --bg-base: #000000;
  --bg-raised: #131315;
  --bg-sunken: #0A0A0B;
  --text-1: #F2F2F4;
  --text-2: #9A9AA2;
  --text-3: #68686E;
  --hairline: rgba(255, 255, 255, 0.12);
  --hairline-strong: rgba(255, 255, 255, 0.22);
  --accent: #9B84FF;
  --accent-quiet: rgba(155, 132, 255, 0.12);
  --on-accent: #141021;
  --q-flow: #3FBFAC;
  --q-silent: #9B84FF;
  --q-phantom: #FF9147;
  --q-loud: #FF6259;
  --header-bg: rgba(0, 0, 0, 0.66);
  --header-shadow: 0 2px 24px rgba(0, 0, 0, 0.30);
  --gutter: clamp(24px, 5vw, 64px);
}

:root[data-mode="light"] {
  color-scheme: light;
  --bg-base: #FFFFFF;
  --bg-raised: #F5F5F7;
  --bg-sunken: #EDEDF0;
  --text-1: #1A1A1C;
  --text-2: #6B6B70;
  --text-3: #9A9AA0;
  --hairline: rgba(0, 0, 0, 0.10);
  --hairline-strong: rgba(0, 0, 0, 0.18);
  --accent: #6B4FD8;
  --accent-quiet: rgba(107, 79, 216, 0.10);
  --on-accent: #FFFFFF;
  --q-flow: #127D6E;
  --q-silent: #6B4FD8;
  --q-phantom: #E86A1C;
  --q-loud: #C4342B;
  --header-bg: rgba(255, 255, 255, 0.72);
  --header-shadow: none;
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg-base);
  color: var(--text-1);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-wrap: pretty;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
img { max-width: 100%; height: auto; }
::selection { background: var(--accent); color: var(--on-accent); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; padding: 12px 20px;
  background: var(--bg-raised); color: var(--text-1);
  border: 1px solid var(--hairline-strong); border-radius: 8px; z-index: 60;
}
.skip-link:focus { left: 16px; top: 16px; }

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container { max-width: 1120px; margin: 0 auto; }
.container-narrow { max-width: 960px; margin: 0 auto; }
.section { padding: clamp(88px, 12vw, 160px) var(--gutter); border-top: 1px solid var(--hairline); }
.section-compact { padding: clamp(56px, 8vw, 96px) var(--gutter); border-top: 1px solid var(--hairline); }
.section-hero { padding: clamp(56px, 8vw, 96px) var(--gutter) clamp(88px, 11vw, 140px); border-top: 0; }
.bg-base { background: var(--bg-base); }
.bg-raised { background: var(--bg-raised); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-fit { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
@media (max-width: 760px) { .grid-2 { grid-template-columns: 1fr; } }

/* --------------------------------------------------------------------------
   Type
   -------------------------------------------------------------------------- */
.kicker {
  margin: 0;
  font-family: var(--font-code);
  font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--accent);
}
.kicker-muted { color: var(--text-3); }
.kicker-loud { color: var(--q-loud); }
.rule { height: 1px; margin: 16px 0 32px; background: var(--accent); opacity: 0.4; transform-origin: left center; }
.rule-loud { background: var(--q-loud); opacity: 0.45; }

.h-hero {
  margin: 0; max-width: 900px;
  font-family: var(--font-display);
  font-size: clamp(44px, 7.2vw, 88px);
  line-height: 1.02; letter-spacing: -0.03em; font-weight: 500;
  color: var(--text-1);
}
.h-page {
  margin: 0; max-width: 900px;
  font-family: var(--font-display);
  font-size: clamp(36px, 5.2vw, 64px);
  line-height: 1.05; letter-spacing: -0.025em; font-weight: 500;
  color: var(--text-1);
}
.h-section {
  margin: 0; max-width: 900px;
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.1; letter-spacing: -0.02em; font-weight: 500;
  color: var(--text-1);
}
.h-sub {
  margin: 0; max-width: 720px;
  font-family: var(--font-display);
  font-size: clamp(26px, 2.6vw, 34px);
  line-height: 1.2; letter-spacing: -0.015em; font-weight: 500;
  color: var(--text-1);
}
.h-card {
  margin: 0;
  font-family: var(--font-display);
  font-size: 24px; line-height: 1.3; letter-spacing: -0.01em; font-weight: 500;
  color: var(--text-1);
}
.lede { margin: 24px 0 0; max-width: 720px; font-size: clamp(19px, 1.5vw, 21px); line-height: 1.55; color: var(--text-2); }
.body-copy { margin: 24px 0 0; max-width: 720px; font-size: 17px; line-height: 1.6; color: var(--text-2); }
.small { font-size: 14px; line-height: 1.45; letter-spacing: 0.005em; color: var(--text-2); }
.mono { font-family: var(--font-code); font-variant-numeric: tabular-nums; }

/* Long-form article prose */
.prose { max-width: 720px; }
.prose h2 {
  margin: clamp(40px, 6vw, 56px) 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 2.4vw, 30px);
  line-height: 1.25; letter-spacing: -0.015em; font-weight: 500;
  color: var(--text-1);
}
.prose h3 {
  margin: 32px 0 0;
  font-family: var(--font-display);
  font-size: 21px; line-height: 1.3; letter-spacing: -0.01em; font-weight: 500;
  color: var(--text-1);
}
.prose p { margin: 20px 0 0; font-size: 17px; line-height: 1.7; color: var(--text-2); }
.prose p strong, .prose li strong { color: var(--text-1); font-weight: 500; }
.prose ul, .prose ol { margin: 20px 0 0; padding-left: 22px; color: var(--text-2); display: grid; gap: 10px; }
.prose blockquote {
  margin: 28px 0 0; padding: 20px 24px;
  border-left: 2px solid var(--accent);
  background: var(--bg-raised);
  border-radius: 0 14px 14px 0;
  color: var(--text-1);
}
.prose blockquote p { margin: 0; color: var(--text-1); }
.prose code { font-family: var(--font-code); font-size: 0.92em; background: var(--bg-raised); border: 1px solid var(--hairline); border-radius: 6px; padding: 1px 6px; }
.prose pre {
  margin: 24px 0 0; padding: 20px 24px; overflow-x: auto;
  background: var(--bg-raised); border: 1px solid var(--hairline); border-radius: 14px;
  font-family: var(--font-code); font-size: 15px; line-height: 1.6; color: var(--text-1);
}
.prose pre code { background: none; border: 0; padding: 0; }
.prose hr { border: 0; height: 1px; background: var(--hairline); margin: clamp(40px, 6vw, 56px) 0 0; }

/* Tables */
.table-wrap { margin: 32px 0 0; overflow-x: auto; }
.data-table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: 15px; }
.data-table th {
  text-align: left; padding: 12px 16px;
  font-family: var(--font-code); font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3);
  border-bottom: 1px solid var(--hairline-strong);
}
.data-table td { padding: 14px 16px; border-bottom: 1px solid var(--hairline); color: var(--text-2); vertical-align: top; }
.data-table td:first-child { color: var(--text-1); }
.data-table .mono { color: var(--text-1); }

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50; height: 64px;
  background: var(--header-bg);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition: border-color 240ms linear, box-shadow 240ms linear;
}
.site-header.is-scrolled { border-bottom-color: var(--hairline); box-shadow: var(--header-shadow); }
.site-header .header-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 var(--gutter); height: 64px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand {
  font-family: var(--font-display); font-size: 19px; font-weight: 500;
  letter-spacing: -0.01em; color: var(--text-1); white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.primary-nav { display: flex; align-items: center; gap: clamp(24px, 3vw, 48px); }
.primary-nav a { font-size: 15px; color: var(--text-2); white-space: nowrap; }
.primary-nav a:hover { color: var(--text-1); text-decoration: none; }
.primary-nav a[aria-current="page"] { color: var(--text-1); }
.header-actions { display: flex; align-items: center; gap: 12px; }

.mode-toggle {
  display: flex; align-items: center; padding: 3px; gap: 2px;
  border: 1px solid var(--hairline); border-radius: 999px;
}
.mode-toggle button {
  width: 40px; height: 32px; display: grid; place-items: center;
  border: 0; border-radius: 999px; background: transparent; color: var(--text-3);
  cursor: pointer; transition: background-color 140ms linear, color 140ms linear;
}
.mode-toggle button[aria-pressed="true"] { background: var(--accent-quiet); color: var(--accent); }

.nav-toggle {
  display: none; width: 44px; height: 44px; place-items: center;
  border: 1px solid var(--hairline); border-radius: 10px;
  background: transparent; color: var(--text-1); cursor: pointer;
}
.mobile-nav { display: none; }

@media (max-width: 1023px) {
  .primary-nav, .site-header .header-cta { display: none !important; }
  .nav-toggle { display: grid; }
  .mobile-nav.is-open {
    display: block; position: fixed; top: 64px; left: 0; right: 0; z-index: 49;
    background: var(--bg-base); border-bottom: 1px solid var(--hairline);
    padding: 16px var(--gutter) 28px;
  }
  .mobile-nav ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 4px; }
  .mobile-nav ul a { display: block; padding: 14px 0; font-size: 19px; color: var(--text-1); border-bottom: 1px solid var(--hairline); }
  .mobile-nav ul a:hover { text-decoration: none; color: var(--accent); }
  .mobile-nav .btn-primary {
    margin-top: 24px; width: 100%;
    display: inline-flex; align-items: center; justify-content: center;
    padding: 0 24px; border-bottom: 0;
    color: var(--on-accent); font-size: 17px;
  }
  .mobile-nav .btn-primary:hover { color: var(--on-accent); text-decoration: none; }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 48px; padding: 0 24px; border: 0; border-radius: 999px;
  background: var(--accent); color: var(--on-accent);
  font-family: var(--font-text); font-size: 17px; font-weight: 500;
  white-space: nowrap; cursor: pointer; text-decoration: none;
  transition: opacity 140ms linear;
}
.btn-primary:hover { opacity: 0.86; text-decoration: none; color: var(--on-accent); }
.btn-primary.btn-sm { height: 40px; padding: 0 20px; font-size: 15px; }
.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 48px; padding: 0 24px; border-radius: 999px;
  border: 1px solid var(--hairline-strong); background: transparent; color: var(--text-1);
  font-family: var(--font-text); font-size: 17px; font-weight: 500;
  white-space: nowrap; cursor: pointer; text-decoration: none;
  transition: border-color 140ms linear;
}
.btn-ghost:hover { border-color: var(--text-2); text-decoration: none; color: var(--text-1); }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-size: 17px; white-space: nowrap; }
.btn-row { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
button:disabled { opacity: 0.45; cursor: not-allowed; }

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  padding: clamp(24px, 3vw, 32px);
  border: 1px solid var(--hairline); border-radius: 14px;
  background: var(--bg-raised);
  transition: border-color 140ms linear;
}
.bg-raised .card { background: var(--bg-base); }
.card:hover { border-color: var(--hairline-strong); }
.card-title-row { display: flex; align-items: center; gap: 10px; }
.card .h-card { margin-top: 20px; }
.card-body { margin: 12px 0 0; font-size: 17px; line-height: 1.6; color: var(--text-2); }
.card-treatment {
  margin: 16px 0 0; padding-top: 16px; border-top: 1px solid var(--hairline);
  font-size: 17px; line-height: 1.6; color: var(--text-1);
}
.card-treatment strong { font-weight: 500; }
a.card-link { display: block; color: inherit; }
a.card-link:hover { text-decoration: none; }

/* Quadrant pattern swatches */
.swatch {
  width: 26px; height: 26px; flex: none;
  border-radius: 8px; border: 1px solid var(--hairline-strong);
}
.pat-silent { background-image: repeating-linear-gradient(45deg, var(--q-silent) 0 1.5px, transparent 1.5px 6px); }
.pat-phantom { color: var(--q-phantom); background-image: radial-gradient(currentColor 1.2px, transparent 1.4px); background-size: 8px 8px; }
.pat-loud { background-image: repeating-linear-gradient(45deg, var(--q-loud) 0 1.5px, transparent 1.5px 5px), repeating-linear-gradient(-45deg, var(--q-loud) 0 1.5px, transparent 1.5px 5px); }
.pat-flow { background: color-mix(in oklab, var(--q-flow) 45%, transparent); }
.q-silent { color: var(--q-silent); }
.q-phantom { color: var(--q-phantom); }
.q-loud { color: var(--q-loud); }
.q-flow { color: var(--q-flow); }

/* Callout with coloured left border */
.callout {
  padding: 20px 24px;
  border-left: 2px solid var(--accent);
  background: var(--bg-raised);
  border-radius: 0 14px 14px 0;
}
.bg-raised .callout { background: var(--bg-base); }
.callout .kicker { margin-bottom: 10px; }
.callout p { margin: 0; font-size: 17px; line-height: 1.6; color: var(--text-1); }
.callout p + p { margin-top: 10px; }
.callout-flow { border-left-color: var(--q-flow); }
.callout-loud { border-left-color: var(--q-loud); }
.callout-phantom { border-left-color: var(--q-phantom); }
.callout-silent { border-left-color: var(--q-silent); }

/* Chips */
.chip {
  display: inline-flex; align-items: center; gap: 8px;
  height: 34px; padding: 0 14px;
  border-radius: 8px; border: 1px solid var(--hairline-strong);
  font-family: var(--font-code); font-size: 14px; color: var(--text-1);
  white-space: nowrap;
}
.chip-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* --------------------------------------------------------------------------
   Score marks: number @ confidence, segment bar
   -------------------------------------------------------------------------- */
.score-mark {
  font-family: var(--font-code); font-weight: 500; line-height: 1.1;
  font-variant-numeric: tabular-nums; color: var(--text-1);
}
.score-mark .at { color: var(--text-3); padding: 0 0.18em; }
.segs { display: flex; gap: 4px; }
.segs i { width: 18px; height: 10px; border-radius: 2px; background: var(--hairline-strong); }
.segs i.on { background: var(--accent); }
.segs-lg { gap: 6px; }
.segs-lg i { width: 34px; height: 16px; border-radius: 3px; }

.stat-number {
  margin: 0; font-family: var(--font-code);
  font-size: clamp(44px, 6vw, 72px); font-weight: 500; line-height: 1.1;
  font-variant-numeric: tabular-nums; color: var(--text-1);
}

/* --------------------------------------------------------------------------
   The matrix
   -------------------------------------------------------------------------- */
.matrix-frame {
  display: grid; grid-template-columns: 36px 1fr; grid-template-rows: 32px 1fr;
  border: 1px solid var(--hairline); border-radius: 22px;
  background: var(--bg-raised); overflow: hidden;
}
.matrix-corner { border-right: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.matrix-x-axis {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(16px, 2.4vw, 28px);
  border-bottom: 1px solid var(--hairline);
  font-family: var(--font-code); font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3);
}
.matrix-x-axis .axis-name { color: var(--text-2); }
.matrix-y-axis {
  display: flex; flex-direction: column; align-items: center; justify-content: space-between;
  padding: clamp(16px, 2.4vw, 28px) 0;
  border-right: 1px solid var(--hairline);
  font-family: var(--font-code); font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3);
}
.matrix-y-axis span { writing-mode: vertical-rl; }
.matrix-y-axis .axis-name { color: var(--text-2); }
.matrix-pad { position: relative; }
.matrix-quads { position: absolute; inset: 0; display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }
.matrix-quads > div { position: relative; overflow: hidden; }
.matrix-quads > div:nth-child(1) { border-right: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.matrix-quads > div:nth-child(2) { border-bottom: 1px solid var(--hairline); }
.matrix-quads > div:nth-child(3) { border-right: 1px solid var(--hairline); }
.mq-fill { position: absolute; inset: 0; }
.mq-fill.fill-flow { background: color-mix(in oklab, var(--q-flow) 12%, transparent); }
.mq-fill.fill-phantom { color: var(--q-phantom); background-image: radial-gradient(currentColor 1.2px, transparent 1.4px); background-size: 11px 11px; opacity: 0.45; }
.mq-fill.fill-silent { background-image: repeating-linear-gradient(45deg, var(--q-silent) 0 1.5px, transparent 1.5px 9px); opacity: 0.45; }
.mq-fill.fill-loud { background-image: repeating-linear-gradient(45deg, var(--q-loud) 0 1.5px, transparent 1.5px 6px), repeating-linear-gradient(-45deg, var(--q-loud) 0 1.5px, transparent 1.5px 6px); opacity: 0.4; }
.mq-active { position: absolute; inset: 0; opacity: 0; transition: opacity 220ms linear; }
.mq-label { position: relative; padding: clamp(16px, 2.4vw, 28px); }
.mq-label .kicker { margin: 0; }
.mq-label h3 {
  margin: 6px 0 0; font-family: var(--font-display);
  font-size: clamp(15px, 2.2vw, 24px); line-height: 1.3;
  letter-spacing: -0.01em; font-weight: 500; color: var(--text-1);
}

/* interactive hero matrix */
.matrix-hero .matrix-pad { touch-action: none; cursor: crosshair; }
.matrix-hero { height: clamp(380px, 52vw, 552px); }
.matrix-guide-v { position: absolute; top: 0; bottom: 0; width: 1px; background: var(--accent); opacity: 0.3; }
.matrix-guide-h { position: absolute; left: 0; right: 0; height: 1px; background: var(--accent); opacity: 0.3; }
.matrix-dot {
  position: absolute; width: 44px; height: 44px; margin: -22px 0 0 -22px;
  display: grid; place-items: center; border-radius: 999px; cursor: grab;
}
.matrix-dot span {
  width: 22px; height: 22px; border-radius: 999px;
  background: var(--accent); border: 3px solid var(--bg-raised);
  box-shadow: 0 0 0 1px var(--accent);
}

/* result plot */
.matrix-plot { height: clamp(360px, 46vw, 480px); }
.plot-point {
  position: absolute; transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: 8px; white-space: nowrap;
}
.plot-point i {
  width: 14px; height: 14px; border-radius: 999px;
  border: 2px solid var(--bg-raised);
}
.plot-point span {
  font-family: var(--font-code); font-size: 12px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-1);
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
.field { display: grid; gap: 8px; margin-top: 24px; }
.field label { font-size: 15px; color: var(--text-1); font-weight: 500; }
.field .hint { font-size: 14px; color: var(--text-3); }
.field input[type="text"], .field input[type="email"], .field input[type="url"], .field textarea, .field select {
  width: 100%; padding: 14px 18px;
  border: 1px solid var(--hairline-strong); border-radius: 8px;
  background: var(--bg-base); color: var(--text-1);
  font-family: var(--font-text); font-size: 17px;
}
.bg-raised .field input, .bg-raised .field textarea, .bg-raised .field select { background: var(--bg-base); }
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.checkbox-row { display: flex; gap: 12px; align-items: flex-start; margin-top: 24px; font-size: 15px; color: var(--text-2); }
.checkbox-row input { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--accent); flex: none; }
.form-status { margin: 16px 0 0; font-size: 15px; }
.form-status.err { color: var(--q-loud); }
.form-status.ok { color: var(--q-flow); }
.hp-field { position: absolute; left: -9999px; opacity: 0; pointer-events: none; }

/* Radio option rows (scorecard answers) */
.option-group { display: grid; gap: 10px; }
.option {
  display: flex; align-items: center; gap: 16px;
  min-height: 56px; padding: 10px 20px;
  border: 1px solid var(--hairline); border-radius: 8px;
  background: transparent; cursor: pointer;
  transition: border-color 140ms linear, background-color 140ms linear;
  font-size: 17px; color: var(--text-1); text-align: left;
  font-family: var(--font-text); width: 100%;
}
.option:hover { border-color: var(--hairline-strong); }
.option[aria-checked="true"] { border-color: var(--accent); background: var(--accent-quiet); }
.option .dot {
  width: 20px; height: 20px; flex: none; border-radius: 999px;
  border: 1px solid var(--hairline-strong); background: transparent;
}
.option[aria-checked="true"] .dot {
  border-color: var(--accent); background: var(--accent);
  box-shadow: inset 0 0 0 3px var(--bg-base);
}

/* Evidence toggle */
.evidence-group {
  display: flex; gap: 2px; padding: 3px;
  border: 1px solid var(--hairline); border-radius: 999px;
  width: max-content; max-width: 100%; flex-wrap: wrap;
}
.evidence-group button {
  min-height: 44px; padding: 0 20px; border: 0; border-radius: 999px;
  background: transparent; color: var(--text-2);
  font-family: var(--font-text); font-size: 15px; font-weight: 500;
  cursor: pointer; transition: background-color 140ms linear, color 140ms linear;
}
.evidence-group button[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); }

/* Progress bar */
.progress-track { flex: 1; height: 4px; border-radius: 999px; background: var(--hairline); overflow: hidden; }
.progress-fill { width: 0%; height: 100%; background: var(--accent); transition: width 320ms ease; }
.progress-fill.pass-2 { background: var(--q-phantom); }

/* --------------------------------------------------------------------------
   Surface rows on the result page
   -------------------------------------------------------------------------- */
.surface-row {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr auto;
  gap: clamp(16px, 3vw, 32px); align-items: center;
  padding: 24px 0; border-bottom: 1px solid var(--hairline);
}
@media (max-width: 760px) {
  .surface-row { grid-template-columns: 1fr 1fr; }
  .surface-row > div:first-child, .surface-row > div:last-child { grid-column: 1 / -1; }
  .surface-row > div:last-child { justify-self: start !important; }
}
.bar-track { height: 8px; border-radius: 999px; background: var(--hairline); overflow: hidden; }
.bar-fill { height: 100%; width: 0%; transition: width 700ms cubic-bezier(0.22, 1, 0.36, 1); }
.bar-label { margin: 0 0 8px; font-family: var(--font-code); font-variant-numeric: tabular-nums; font-size: 14px; color: var(--text-2); }
.bar-label strong { color: var(--text-1); font-weight: 500; }

/* Numbered steps (loop / actions) */
.step-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 24px; }
.step-list > li { display: grid; grid-template-columns: 38px 1fr; gap: 16px; align-items: start; }
.step-num {
  display: grid; place-items: center; width: 38px; height: 38px;
  border-radius: 999px; border: 1px solid var(--hairline-strong);
  background: var(--bg-raised);
  font-family: var(--font-code); font-variant-numeric: tabular-nums;
  font-size: 14px; color: var(--accent);
}
.step-list p { margin: 0; font-size: 17px; line-height: 1.6; color: var(--text-1); }
.step-list .step-note { margin-top: 8px; font-size: 14px; color: var(--text-3); }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--bg-sunken);
  border-top: 1px solid var(--hairline);
  padding: clamp(56px, 7vw, 88px) var(--gutter) 40px;
}
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 40px; }
.footer-grid .kicker { margin-bottom: 16px; }
.footer-grid ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.footer-grid a { font-size: 15px; color: var(--text-2); }
.footer-grid a:hover { color: var(--text-1); text-decoration: none; }
.footer-meta {
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--hairline);
  display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between;
}
.footer-meta p { margin: 0; font-family: var(--font-code); font-variant-numeric: tabular-nums; font-size: 14px; color: var(--text-3); }
.footer-tagline { margin: 0 0 40px; max-width: 560px; font-size: 15px; line-height: 1.6; color: var(--text-3); }

/* --------------------------------------------------------------------------
   Scroll reveal
   -------------------------------------------------------------------------- */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity 640ms cubic-bezier(0.22, 1, 0.36, 1), transform 640ms cubic-bezier(0.22, 1, 0.36, 1); }
[data-reveal="line"] { opacity: 1; transform: scaleX(0); transform-origin: left center; }
[data-reveal].is-in { opacity: 1; transform: none; }
[data-reveal="line"].is-in { transform: scaleX(1); }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
  .bar-fill { transition: none; }
}

/* --------------------------------------------------------------------------
   Article meta / insights index
   -------------------------------------------------------------------------- */
.article-meta { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 20px 0 0; font-family: var(--font-code); font-size: 14px; color: var(--text-3); font-variant-numeric: tabular-nums; }
.summary-box { margin: 32px 0 0; }
.article-list { margin: 40px 0 0; border-top: 1px solid var(--hairline); }
.article-list-item { display: block; padding: 28px 0; border-bottom: 1px solid var(--hairline); color: inherit; }
.article-list-item:hover { text-decoration: none; }
.article-list-item:hover .ali-title { color: var(--accent); }
.ali-title { margin: 6px 0 0; font-family: var(--font-display); font-size: clamp(21px, 2.4vw, 26px); line-height: 1.25; letter-spacing: -0.01em; font-weight: 500; color: var(--text-1); transition: color 140ms linear; }
.ali-desc { margin: 10px 0 0; max-width: 720px; font-size: 16px; line-height: 1.6; color: var(--text-2); }

/* --------------------------------------------------------------------------
   Manifesto
   -------------------------------------------------------------------------- */
.manifesto-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: clamp(32px, 5vw, 72px); align-items: start; }
.manifesto-toc { position: sticky; top: 96px; }
.manifesto-toc ol { margin: 16px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.manifesto-toc a { font-size: 14px; color: var(--text-2); line-height: 1.4; display: block; }
.manifesto-toc a:hover { color: var(--text-1); text-decoration: none; }
.manifesto-toc .toc-num { font-family: var(--font-code); font-variant-numeric: tabular-nums; color: var(--text-3); margin-right: 8px; }
@media (max-width: 1023px) { .manifesto-layout { grid-template-columns: 1fr; } .manifesto-toc { display: none; } }
.eq {
  margin: 24px 0 0; padding: 20px 24px; overflow-x: auto;
  background: var(--bg-raised); border: 1px solid var(--hairline); border-radius: 14px;
  font-family: var(--font-code); font-size: 15px; line-height: 1.7; color: var(--text-1);
  font-variant-numeric: tabular-nums; white-space: pre;
}
.bg-raised .eq { background: var(--bg-base); }
.refs { margin: 24px 0 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.refs li { font-size: 15px; line-height: 1.6; color: var(--text-2); padding-left: 20px; text-indent: -20px; }
.refs li em { color: var(--text-1); font-style: italic; }
@media print {
  .site-header, .site-footer, .mobile-nav, .manifesto-toc, .no-print { display: none !important; }
  body { background: #fff; color: #111; }
  .manifesto-layout { grid-template-columns: 1fr; }
}

/* Utility */
.mt-0 { margin-top: 0; }
.center { text-align: center; }
.center .lede, .center .body-copy { margin-left: auto; margin-right: auto; }
.center .btn-row { justify-content: center; }