/* ──────────────────────────────────────────────────────────────────
 * The Quant — Founder Competition landing (T50 refresh)
 *
 * Aesthetic direction (per the frontend-design skill's "commit to a
 * bold direction" guidance + the T50 brief): refined editorial,
 * trading-pro institutional. Reference points are Bloomberg
 * Terminal × Linear × Polestar × Stripe Press — NOT generic SaaS.
 *
 * Hard rules from the skill:
 *   - No Inter, Roboto, Arial — distinctive type only.
 *   - No purple → blue gradients. Dominant colour with one sharp
 *     accent. Generous negative space.
 *   - Sharp geometry (radius 2-4px max); no pill shapes.
 *
 * Type pairing:
 *   - Fraunces (variable serif, optical-size axis) — display/heads
 *   - IBM Plex Sans (institutional industrial sans) — body
 *   - IBM Plex Mono — tabular numerals, eyebrow labels, code
 *
 * Palette:
 *   - bg-primary #1b1d29 (deep navy/charcoal — the brand-given base)
 *   - text-primary #ffffff
 *   - accent #c9a26b (warm muted gold — picks up the "founder
 *     selection / prestigious / trading floor" semantics over the
 *     cool-blue or émeraude alternatives in the brief)
 *
 * Spacing: 8pt grid (with 4px micro-stops for borders/insets).
 * Shadows: monochrome, ultra-subtle (gray on navy).
 * ───────────────────────────────────────────────────────────────── */

/* ── Font import ─────────────────────────────────────────────────── */
@import url("https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,300;9..144,400;9..144,500;9..144,600;9..144,700&family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@300;400;500;600;700&display=swap");

/* ── Reset (minimal) ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html, body { height: 100%; }
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }

/* ── Design tokens ───────────────────────────────────────────────── */
:root {
  /* Colours */
  --bg-primary: #1b1d29;
  --bg-elevated: #22243a;
  --bg-overlay: rgba(255, 255, 255, 0.02);
  --border-subtle: #2a2d3a;
  --border-medium: #3a3d4f;
  --text-primary: #ffffff;
  --text-secondary: #c5c8d6;
  --text-tertiary: #8a8d9f;
  --text-quaternary: #5a5d6f;
  --accent: #c9a26b;
  --accent-bright: #e0bd8a;
  --accent-dim: #8a6d44;

  /* Type */
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", Consolas, monospace;

  /* Spacing — 8pt grid + 4px micro */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;
  --space-40: 160px;

  /* Radius — 4px ceiling */
  --radius-sm: 2px;
  --radius-md: 4px;

  /* Shadows — monochrome subtle */
  --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.03) inset,
                 0 8px 24px rgba(0, 0, 0, 0.3);
  --shadow-cta: 0 1px 0 rgba(255, 255, 255, 0.06) inset,
                0 8px 24px rgba(201, 162, 107, 0.15),
                0 1px 2px rgba(0, 0, 0, 0.4);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 160ms;
  --dur-base: 240ms;
  --dur-slow: 600ms;

  /* Layout */
  --container-max: 1200px;
  --container-pad: clamp(20px, 5vw, 48px);
}

/* ── Page base ───────────────────────────────────────────────────── */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  /* Subtle vertical gradient — same-hue dropoff, NOT a generic
   * SaaS purple→blue. Adds atmospheric depth from the top edge. */
  background-image: radial-gradient(
    ellipse 80% 60% at 50% 0%,
    rgba(201, 162, 107, 0.04) 0%,
    rgba(27, 29, 41, 0) 60%
  );
  background-attachment: fixed;
  overflow-x: hidden;
}

/* Trading-pro touch: faint grid overlay drawn behind everything.
 * 80×80 cells at ~1.8% opacity. Reads as Bloomberg-grid texture
 * without visual noise. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 80px 80px;
}

main, header, footer { position: relative; z-index: 1; }

/* Selection: gold instead of OS default blue. */
::selection { background: var(--accent); color: var(--bg-primary); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ── Typography ──────────────────────────────────────────────────── */
.display {
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-variation-settings: "opsz" 144;
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--text-primary);
}

.h1 { font-size: clamp(2.5rem, 6vw, 4.75rem); }
.h2 { font-size: clamp(2rem, 4.5vw, 3.25rem); }
.h3 { font-size: clamp(1.5rem, 3vw, 2.25rem); letter-spacing: -0.01em; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.lead {
  font-size: clamp(1.125rem, 1.6vw, 1.375rem);
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 60ch;
}

.body { color: var(--text-secondary); line-height: 1.65; }
.muted { color: var(--text-tertiary); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ── Container ───────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}
.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  box-shadow: var(--shadow-cta);
}
.btn-primary:hover { background: var(--accent-bright); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-medium);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-bright); }
.btn-xl { padding: var(--space-4) var(--space-12); font-size: 1rem; }
.btn .arrow { display: inline-block; transition: transform var(--dur-fast) var(--ease-out); }
.btn:hover .arrow { transform: translateX(3px); }

/* ── Header ──────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  background: rgba(27, 29, 41, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}
.site-header.scrolled {
  background: rgba(27, 29, 41, 0.92);
  border-bottom-color: var(--border-subtle);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  height: 64px;
}

.brand-link { display: flex; align-items: center; flex-shrink: 0; }
.brand-mark { height: 36px; width: auto; filter: drop-shadow(0 1px 2px rgba(0,0,0,0.5)); }

.nav-primary { display: none; gap: var(--space-8); align-items: center; }
@media (min-width: 1024px) { .nav-primary { display: flex; } }
.nav-primary a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav-primary a:hover { color: var(--text-primary); }
.nav-primary a::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: -6px;
  height: 1px; background: var(--accent);
  transition: right var(--dur-base) var(--ease-out);
}
.nav-primary a:hover::after { right: 0; }

.header-right { display: flex; align-items: center; gap: var(--space-4); }

/* Language switcher — used in header + footer. */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2px;
  background: rgba(0, 0, 0, 0.2);
}
.lang-switcher button {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  font-weight: 500;
  color: var(--text-tertiary);
  padding: 4px 8px;
  border-radius: 2px;
  transition: background var(--dur-fast), color var(--dur-fast);
}
.lang-switcher button:hover { color: var(--text-primary); }
.lang-switcher button.active { background: var(--accent); color: var(--bg-primary); }

/* ── Hero ────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  padding-top: clamp(80px, 12vh, 140px);
  padding-bottom: clamp(80px, 12vh, 160px);
  overflow: hidden;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-8);
  max-width: 920px;
}
.hero-eyebrow { display: flex; align-items: center; gap: var(--space-3); }
.hero-eyebrow::before { content: ""; width: 32px; height: 1px; background: var(--accent); }
.hero-title { font-variation-settings: "opsz" 144; font-weight: 400; }
.hero-title em {
  font-style: italic;
  font-variation-settings: "opsz" 144;
  color: var(--accent);
}
.hero-sub { max-width: 56ch; }
.hero-cta-row { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center; margin-top: var(--space-4); }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-subtle);
}
.hero-meta-item { display: flex; flex-direction: column; gap: var(--space-1); }
.hero-meta-item .num {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 500;
  font-variation-settings: "opsz" 144;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  line-height: 1;
}
.hero-meta-item .lbl {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

/* ── Section base ────────────────────────────────────────────────── */
.section {
  padding-top: clamp(64px, 10vh, 128px);
  padding-bottom: clamp(64px, 10vh, 128px);
  border-top: 1px solid var(--border-subtle);
}
.section-header {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
  max-width: 720px;
}
.section-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--text-tertiary);
}

/* ── "What is it" — 3 cards ─────────────────────────────────────── */
.cards-3 { display: grid; gap: var(--space-6); grid-template-columns: 1fr; }
@media (min-width: 768px) { .cards-3 { grid-template-columns: repeat(3, 1fr); } }

.card {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  display: grid;
  gap: var(--space-4);
  align-content: start;
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}
.card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.card::before {
  content: "";
  position: absolute;
  top: 0; left: var(--space-8); right: var(--space-8);
  height: 1px;
  background: var(--accent);
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}
.card:hover::before { transform: scaleX(1); }
.card-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.card-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  font-variation-settings: "opsz" 36;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
.card-body { color: var(--text-secondary); font-size: 0.9375rem; }

/* ── Timeline ────────────────────────────────────────────────────── */
.timeline { display: grid; gap: var(--space-6); }
@media (min-width: 1024px) {
  .timeline { grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
  .timeline::before {
    content: "";
    position: absolute;
    top: 22px; left: 10%; right: 10%;
    height: 1px;
    background: linear-gradient(
      to right,
      var(--border-subtle) 0,
      var(--accent-dim) 50%,
      var(--border-subtle) 100%
    );
  }
}
.timeline-step {
  position: relative;
  padding: var(--space-6) var(--space-4) 0;
  display: grid; gap: var(--space-2);
  align-content: start;
}
.timeline-step::before {
  content: "";
  position: absolute;
  top: 16px; left: var(--space-4);
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  z-index: 1;
}
@media (min-width: 1024px) {
  .timeline-step { padding-top: var(--space-12); text-align: left; }
  .timeline-step::before { top: 16px; left: 0; }
}
.timeline-day {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.timeline-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  font-variation-settings: "opsz" 20;
  color: var(--text-primary);
}
.timeline-body { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.55; }

/* ── Criteria — magazine list ────────────────────────────────────── */
.criteria { display: grid; grid-template-columns: 1fr; gap: 0; margin-top: var(--space-8); }
.criterion {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-6);
  align-items: baseline;
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--border-subtle);
  transition: padding-left var(--dur-base) var(--ease-out);
}
.criterion:hover { padding-left: var(--space-3); }
.criterion-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  min-width: 36px;
}
.criterion-name {
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 500;
  font-variation-settings: "opsz" 24;
  letter-spacing: -0.01em;
}
.criterion-desc {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  text-align: right;
  max-width: 38ch;
}
@media (max-width: 767px) {
  .criterion { grid-template-columns: auto 1fr; gap: var(--space-3) var(--space-4); }
  .criterion-desc { grid-column: 1 / -1; text-align: left; margin-left: 60px; }
}
.criteria-note {
  margin-top: var(--space-8);
  padding: var(--space-6);
  border-left: 2px solid var(--accent);
  background: var(--bg-overlay);
  font-style: italic;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-variation-settings: "opsz" 20;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── FAQ ─────────────────────────────────────────────────────────── */
.faq { display: grid; gap: var(--space-2); margin-top: var(--space-8); }
.faq details {
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-4) 0;
}
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-2) 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: color var(--dur-fast) var(--ease-out);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent-bright); }
.faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--accent);
  transition: transform var(--dur-base) var(--ease-out);
  flex-shrink: 0;
}
.faq details[open] summary::after { content: "−"; }
.faq-answer {
  padding-top: var(--space-3);
  padding-right: var(--space-12);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.65;
}

/* ── Final CTA band ──────────────────────────────────────────────── */
.final-cta {
  margin-top: var(--space-16);
  padding: clamp(48px, 10vw, 96px) clamp(24px, 6vw, 80px);
  text-align: center;
  background:
    radial-gradient(
      ellipse 70% 80% at 50% 50%,
      rgba(201, 162, 107, 0.12) 0%,
      rgba(201, 162, 107, 0) 70%
    ),
    var(--bg-elevated);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}
.final-cta::before,
.final-cta::after {
  content: "";
  position: absolute;
  top: var(--space-4); bottom: var(--space-4);
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--accent-dim), transparent);
}
.final-cta::before { left: var(--space-4); }
.final-cta::after { right: var(--space-4); }
.final-cta .display { margin-bottom: var(--space-6); }
.final-cta .lead { margin: 0 auto var(--space-8); color: var(--text-secondary); }

/* ── Footer ──────────────────────────────────────────────────────── */
.site-footer {
  margin-top: var(--space-20);
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
  border-top: 1px solid var(--border-subtle);
  color: var(--text-tertiary);
  font-size: 0.875rem;
}
.footer-grid { display: grid; gap: var(--space-8); grid-template-columns: 1fr; }
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; align-items: start; }
}
.footer-brand { display: grid; gap: var(--space-3); max-width: 28ch; }
.footer-brand img { height: 32px; width: auto; }
.footer-brand p { font-size: 0.8125rem; color: var(--text-tertiary); }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  font-weight: 500;
}
.footer-col ul { list-style: none; padding: 0; display: grid; gap: var(--space-2); }
.footer-col a { color: var(--text-tertiary); transition: color var(--dur-fast) var(--ease-out); }
.footer-col a:hover { color: var(--accent-bright); }
.footer-bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--text-quaternary);
  text-transform: uppercase;
}

/* ── Legal pages (privacy / terms) ───────────────────────────────── */
.legal-page {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-16) var(--container-pad);
  min-height: calc(100vh - 64px);
}
.legal-page h1 { margin-bottom: var(--space-8); }
.legal-page p {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  font-size: 1.0625rem;
  line-height: 1.65;
}
.legal-page a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-dim);
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.legal-page a:hover { color: var(--accent-bright); border-bottom-color: var(--accent-bright); }
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-bottom: none !important;
}

/* ── Page-load reveal (single orchestrated stagger) ──────────────── */
@keyframes reveal-up {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-inner > * {
  opacity: 0;
  animation: reveal-up var(--dur-slow) var(--ease-out) forwards;
}
.hero-inner > *:nth-child(1) { animation-delay: 80ms; }
.hero-inner > *:nth-child(2) { animation-delay: 160ms; }
.hero-inner > *:nth-child(3) { animation-delay: 240ms; }
.hero-inner > *:nth-child(4) { animation-delay: 320ms; }
.hero-inner > *:nth-child(5) { animation-delay: 400ms; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .hero-inner > * { opacity: 1; transform: none; }
}

/* Skip link — invisible until focused. */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--accent);
  color: var(--bg-primary);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  z-index: 100;
  transition: top var(--dur-base) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); }

/* ──────────────────────────────────────────────────────────────────
 * T51 additions — content refonte sections.
 * Reuses the locked T50 design tokens (no new colours, no new type).
 * ───────────────────────────────────────────────────────────────── */

/* Narrow container — used for video + ambassador where the section
   reads better at a tighter measure than the 1200px page max. */
.container--narrow { max-width: 880px; }

/* 4-card grid — 2×2 on desktop, single column on mobile. The 3-card
   variant stays its own thing (founder contest still uses .cards-3). */
.cards-4 { display: grid; gap: var(--space-6); grid-template-columns: 1fr; }
@media (min-width: 768px) { .cards-4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .cards-4 { grid-template-columns: repeat(2, 1fr); } }

/* ── Video section ──────────────────────────────────────────────── */
.section--video .section-header { text-align: center; margin-left: auto; margin-right: auto; max-width: 720px; }
.section--video .section-header .lead { margin-left: auto; margin-right: auto; }
.section--video .section-num { display: block; }

.video-wrapper {
  position: relative;
  margin: 0;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}
.video-wrapper::before {
  content: "";
  display: block;
  padding-top: 56.25%; /* 16:9 */
}
.video-wrapper iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.video-wrapper figcaption {
  position: absolute;
  bottom: var(--space-2);
  right: var(--space-3);
  padding: 2px 8px;
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  background: rgba(27, 29, 41, 0.88);
  border-radius: var(--radius-sm);
  pointer-events: none;
}

/* ── Curriculum — feature tags ─────────────────────────────────── */
.feature-stack {
  display: grid;
  gap: var(--space-12);
  margin-top: var(--space-8);
}
@media (min-width: 1024px) {
  .feature-stack { grid-template-columns: repeat(2, 1fr); gap: var(--space-16); }
}
.feature-group {
  display: grid;
  gap: var(--space-6);
  align-content: start;
}
.feature-group-header {
  display: grid;
  gap: var(--space-2);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
}
.feature-group-header .eyebrow { color: var(--text-tertiary); }
.feature-group-header h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-variation-settings: "opsz" 36;
  color: var(--text-primary);
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
}
.feature-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.15);
  transition: border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.feature-tag:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  transform: translateY(-1px);
}

/* ── Founder Contest cards ─────────────────────────────────────── */
.contest-cards .contest-card {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  display: grid;
  gap: var(--space-3);
  align-content: start;
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}
.contest-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}
.contest-num {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 500;
  font-variation-settings: "opsz" 144;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--accent);
}
.contest-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-top: var(--space-2);
}
.contest-body {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-top: var(--space-2);
}

/* ── Founder benefits — 2-col grid with marker ─────────────────── */
.benefits-grid {
  display: grid;
  gap: var(--space-6) var(--space-8);
  grid-template-columns: 1fr;
  list-style: none;
  padding: 0;
  margin-top: var(--space-8);
}
@media (min-width: 768px) { .benefits-grid { grid-template-columns: repeat(2, 1fr); } }

.benefit {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: start;
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border-subtle);
}
.benefit-check {
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--accent);
  padding-top: 2px;
}
.benefit-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  font-variation-settings: "opsz" 20;
  color: var(--text-primary);
  letter-spacing: -0.005em;
  margin-bottom: var(--space-1);
}
.benefit-body {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  line-height: 1.55;
}

/* ── Ambassador — quieter aesthetic than the other sections ────── */
.section--ambassador { border-top-color: transparent; }
.ambassador {
  padding: var(--space-12);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background:
    linear-gradient(
      135deg,
      rgba(201, 162, 107, 0.04) 0%,
      rgba(201, 162, 107, 0) 60%
    ),
    var(--bg-overlay);
  display: grid;
  gap: var(--space-4);
}
.ambassador .display { color: var(--text-primary); margin-top: var(--space-1); }
.ambassador-body {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 64ch;
}
.ambassador-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  padding-bottom: 4px;
  border-bottom: 1px solid var(--accent-dim);
  align-self: start;
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.ambassador-cta .arrow { transition: transform var(--dur-fast) var(--ease-out); }
.ambassador-cta:hover { color: var(--accent-bright); border-bottom-color: var(--accent-bright); }
.ambassador-cta:hover .arrow { transform: translateX(3px); }

/* ── Hero meta — 5 items, slightly tighter on mobile ───────────── */
@media (max-width: 640px) {
  .hero-meta { gap: var(--space-6); }
  .hero-meta-item .num { font-size: 1.5rem; }
}