/* ============================================
   AGENCE MANTU 2026 · Brand Tokens & Foundations
   Learn IA @ Mantu
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

:root {
  /* Couleurs principales 2026 */
  --mantu-purple: #2B0058;
  --mantu-purple-deep: #180038;
  --mantu-purple-glow: #3B0070;
  --pink-accent: #FFD6FF;
  --mantu-lila: #B764FF;
  --pink-light: #FFF9FE;

  /* Couleurs neutres */
  --white: #FFFFFF;
  --black: #000000;
  --grey-900: #1F1F1F;
  --grey-700: #2D2D2D;
  --grey-500: #545454;
  --grey-300: #BDBDBD;
  --grey-100: #DCDCDC;
  --grey-50:  #EFEFEF;

  /* Typo */
  --font-display: 'Space Grotesk', system-ui, -apple-system, Helvetica, Arial, sans-serif;
  --font-body:    'Space Grotesk', system-ui, -apple-system, Helvetica, Arial, sans-serif;

  /* Espacement */
  --container: 1200px;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-pill: 100px;

  --transition: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--grey-900);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ============================================
   TYPOGRAPHIE
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  color: var(--mantu-purple);
  margin: 0 0 0.6em 0;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); }
h3 { font-size: clamp(1.3rem, 2.2vw, 1.6rem); }
h4 { font-size: 1.15rem; }
p  { margin: 0 0 1em 0; color: var(--grey-700); }

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mantu-lila);
  margin-bottom: 1rem;
}

.lead {
  font-size: 1.15rem;
  color: var(--grey-700);
  line-height: 1.7;
}

/* ============================================
   BACKGROUNDS
   ============================================ */
.bg-dark {
  background: radial-gradient(
    ellipse 100% 65% at 50% 0%,
    var(--mantu-purple-glow) 0%,
    var(--mantu-purple) 18%,
    #100020 55%,
    var(--black) 85%
  );
  color: var(--white);
}
.bg-dark h1, .bg-dark h2, .bg-dark h3, .bg-dark h4 { color: var(--white); }
.bg-dark p { color: rgba(255, 255, 255, 0.85); }
.bg-dark .eyebrow { color: var(--pink-accent); }

.bg-pink-light { background: var(--pink-light); }
.bg-white { background: var(--white); }

/* ============================================
   LAYOUT
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: clamp(60px, 8vw, 120px) 0; }
.section-sm { padding: clamp(40px, 5vw, 80px) 0; }

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(43, 0, 88, 0.08);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: var(--container);
  margin: 0 auto;
}
.navbar-brand { display: flex; align-items: center; gap: 12px; }
.navbar-brand img { height: 36px; width: auto; }
.navbar-brand-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--mantu-purple);
  letter-spacing: -0.01em;
}
.navbar-brand-title span {
  color: var(--mantu-lila);
}
.navbar-links { display: flex; gap: 32px; align-items: center; }
.navbar-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--grey-700);
  transition: color var(--transition);
}
.navbar-links a:hover { color: var(--mantu-purple); }

.navbar-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--grey-500);
}

/* Language switcher */
.lang-switch {
  display: inline-flex;
  background: var(--grey-50);
  border-radius: var(--radius-pill);
  padding: 3px;
  margin-right: 16px;
}
.lang-switch a {
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--grey-500);
  transition: all var(--transition);
  text-decoration: none;
}
.lang-switch a.is-active {
  background: var(--mantu-purple);
  color: var(--white);
}
.lang-switch a:not(.is-active):hover {
  color: var(--mantu-purple);
}
@media (max-width: 720px) {
  .lang-switch { margin-right: 8px; }
  .lang-switch a { padding: 4px 10px; font-size: 0.72rem; }
}
.navbar-progress-bar {
  width: 90px;
  height: 6px;
  background: var(--grey-50);
  border-radius: var(--radius-pill);
  overflow: hidden;
}
.navbar-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--mantu-purple), var(--mantu-lila));
  border-radius: var(--radius-pill);
  transition: width 400ms ease;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.005em;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
}
.btn-primary {
  background: var(--mantu-purple);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--mantu-purple-deep);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(43, 0, 88, 0.25);
}
.btn-light {
  background: var(--white);
  color: var(--mantu-purple);
}
.btn-light:hover {
  background: var(--pink-light);
  transform: translateY(-1px);
}
.btn-outline {
  background: transparent;
  color: var(--mantu-purple);
  border: 1.5px solid var(--mantu-purple);
}
.btn-outline:hover {
  background: var(--mantu-purple);
  color: var(--white);
}
.bg-dark .btn-outline {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.35);
}
.bg-dark .btn-outline:hover {
  background: var(--white);
  color: var(--mantu-purple);
}
.btn-ghost {
  background: transparent;
  color: var(--mantu-purple);
}
.btn-ghost:hover {
  background: var(--pink-light);
}

/* ============================================
   CAPSULES & TAGS
   ============================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid rgba(43, 0, 88, 0.18);
  border-radius: var(--radius-pill);
  color: var(--mantu-purple);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  background: rgba(255, 214, 255, 0.12);
}
.bg-dark .tag {
  color: var(--pink-accent);
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.04);
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid rgba(43, 0, 88, 0.06);
  transition: all var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(43, 0, 88, 0.08);
  border-color: rgba(43, 0, 88, 0.15);
}
.card-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--mantu-purple);
  margin: 0 0 10px 0;
}
.card-desc {
  font-size: 0.95rem;
  color: var(--grey-700);
  margin: 0;
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(80px, 12vw, 160px) 0 clamp(60px, 10vw, 140px);
}
.hero-inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 2;
}
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.hero p.lead {
  font-size: clamp(1.05rem, 1.5vw, 1.3rem);
  max-width: 680px;
  margin: 0 auto 40px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-capsule {
  position: absolute;
  border: 1.5px solid rgba(255, 255, 255, 0.12);
  border-radius: 400px;
  pointer-events: none;
}
.hero-capsule-1 { width: 700px; height: 320px; top: -100px; right: -200px; transform: rotate(-18deg); }
.hero-capsule-2 { width: 420px; height: 200px; bottom: -80px; left: -150px; transform: rotate(12deg); }

/* ============================================
   MODULE CARD (grid on landing)
   ============================================ */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.module-card {
  display: block;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  border: 1px solid rgba(43, 0, 88, 0.06);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.module-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mantu-purple), var(--mantu-lila));
  opacity: 0;
  transition: opacity var(--transition);
}
.module-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 60px rgba(43, 0, 88, 0.12);
  border-color: rgba(43, 0, 88, 0.15);
}
.module-card:hover::before { opacity: 1; }
.module-card.is-completed {
  background: linear-gradient(135deg, rgba(255, 249, 254, 0.5), rgba(255, 214, 255, 0.15));
}
.module-card.is-completed::before { opacity: 1; }
.module-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--pink-light);
  color: var(--mantu-purple);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 20px;
}
.module-card.is-completed .module-num {
  background: var(--mantu-purple);
  color: var(--white);
}
.module-card.is-completed .module-num::after {
  content: '✓';
  font-size: 1.3rem;
  position: absolute;
}
.module-card.is-completed .module-num span { display: none; }
.module-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--mantu-purple);
  margin: 0 0 10px 0;
  letter-spacing: -0.01em;
}
.module-desc {
  font-size: 0.95rem;
  color: var(--grey-700);
  margin: 0 0 20px 0;
}
.module-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--grey-500);
}
.module-meta-item { display: flex; align-items: center; gap: 6px; }

/* ============================================
   LESSON LAYOUT
   ============================================ */
.lesson {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 60px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 60px 24px;
}
@media (max-width: 960px) {
  .lesson { grid-template-columns: 1fr; gap: 32px; padding: 32px 20px; }
}

.lesson-nav {
  position: sticky;
  top: 90px;
  height: max-content;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--pink-light);
  border: 1px solid rgba(43, 0, 88, 0.06);
}
.lesson-nav-title {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mantu-lila);
  margin-bottom: 16px;
}
.lesson-nav ol {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: ln;
}
.lesson-nav li {
  counter-increment: ln;
  position: relative;
  padding: 10px 0 10px 36px;
  font-size: 0.9rem;
}
.lesson-nav li::before {
  content: counter(ln, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 10px;
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--mantu-lila);
}
.lesson-nav li a {
  color: var(--grey-700);
  transition: color var(--transition);
}
.lesson-nav li a:hover,
.lesson-nav li.is-active a { color: var(--mantu-purple); font-weight: 600; }

@media (max-width: 960px) {
  .lesson-nav { position: static; top: auto; }
}

.lesson-content { min-width: 0; }
.lesson-header { margin-bottom: 48px; }
.lesson-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 16px;
}
.lesson-meta {
  display: flex;
  gap: 20px;
  color: var(--grey-500);
  font-size: 0.88rem;
}
.lesson-meta-item { display: flex; align-items: center; gap: 6px; }

.lesson-section {
  margin-bottom: 48px;
  padding-top: 20px;
  scroll-margin-top: 100px;
}
.lesson-section h2 {
  font-size: 1.7rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(43, 0, 88, 0.08);
}
.lesson-section h3 {
  font-size: 1.2rem;
  color: var(--mantu-purple);
  margin-top: 28px;
}
.lesson-section ul, .lesson-section ol {
  padding-left: 24px;
  color: var(--grey-700);
}
.lesson-section li { margin-bottom: 6px; }
.lesson-section strong { color: var(--mantu-purple); font-weight: 600; }
.lesson-section code {
  background: var(--pink-light);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.88em;
  font-family: 'SF Mono', Menlo, Monaco, Consolas, monospace;
  color: var(--mantu-purple);
}

/* Callouts */
.callout {
  display: flex;
  gap: 16px;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  background: var(--pink-light);
  border-left: 3px solid var(--mantu-lila);
  margin: 24px 0;
}
.callout-icon { font-size: 1.4rem; flex-shrink: 0; }
.callout-content { flex: 1; }
.callout-content p:last-child { margin-bottom: 0; }
.callout-title {
  font-weight: 600;
  color: var(--mantu-purple);
  font-size: 0.95rem;
  margin-bottom: 4px;
  letter-spacing: 0.02em;
}
.callout-key { background: linear-gradient(135deg, rgba(183, 100, 255, 0.08), rgba(255, 214, 255, 0.25)); }
.callout-warning {
  background: #FFF4F4;
  border-left-color: #D44;
}
.callout-warning .callout-title { color: #D44; }
.callout-pro { background: linear-gradient(135deg, #f4ecff, var(--pink-light)); }

/* Prompt block */
.prompt-block {
  background: var(--mantu-purple);
  color: var(--white);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 24px 0;
  position: relative;
}
.prompt-block-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--pink-accent);
  margin-bottom: 12px;
}
.prompt-block pre {
  margin: 0;
  font-family: 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  white-space: pre-wrap;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.94);
}
.prompt-block-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.prompt-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
  font-size: 0.82rem;
  font-weight: 500;
  transition: background var(--transition);
}
.prompt-btn:hover { background: rgba(255, 255, 255, 0.2); }

/* Comparison tables */
.lesson-section table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.92rem;
}
.lesson-section th, .lesson-section td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(43, 0, 88, 0.08);
}
.lesson-section th {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
  background: var(--pink-light);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
.lesson-section tr:hover td { background: rgba(255, 249, 254, 0.5); }

/* Tools grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 20px 0;
}
.tool-item {
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--pink-light);
  border: 1px solid rgba(43, 0, 88, 0.06);
}
.tool-item-name {
  font-weight: 600;
  color: var(--mantu-purple);
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.tool-item-desc { font-size: 0.82rem; color: var(--grey-500); }

/* ============================================
   DIAGRAMS & VISUALS
   ============================================ */
.diagram {
  margin: 36px 0;
  padding: 32px;
  background: linear-gradient(135deg, rgba(255, 249, 254, 0.6), rgba(255, 214, 255, 0.18));
  border: 1px solid rgba(43, 0, 88, 0.08);
  border-radius: var(--radius-lg);
  position: relative;
}
.diagram-dark {
  background: radial-gradient(ellipse 90% 70% at 50% 0%, #3B0070 0%, #2B0058 22%, #100020 70%, #000 100%);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--white);
}
.diagram-dark .diagram-caption { color: rgba(255, 255, 255, 0.7); }
.diagram-caption {
  margin-top: 16px;
  font-size: 0.82rem;
  color: var(--grey-500);
  text-align: center;
  font-style: italic;
}
.diagram svg { max-width: 100%; height: auto; display: block; margin: 0 auto; }

/* Russian dolls */
.russian-dolls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}
.russian-doll {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 2px solid var(--mantu-purple);
  background: rgba(255, 255, 255, 0.6);
}
.russian-doll-1 { width: 280px; height: 280px; background: rgba(43, 0, 88, 0.04); }
.russian-doll-2 { width: 200px; height: 200px; background: rgba(43, 0, 88, 0.08); border-color: var(--mantu-lila); }
.russian-doll-3 { width: 120px; height: 120px; background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila)); border-color: var(--mantu-purple); color: var(--white); }
.russian-doll-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--mantu-purple);
}
.russian-doll-3 .russian-doll-label { color: var(--white); }
.russian-doll-tag {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grey-500);
  margin-top: 2px;
}
.russian-doll-3 .russian-doll-tag { color: var(--pink-accent); }

/* Probability flow */
.prob-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 20px 0;
}
.prob-token {
  padding: 12px 18px;
  border-radius: 14px;
  background: var(--white);
  font-family: 'SF Mono', Menlo, monospace;
  font-size: 0.92rem;
  color: var(--mantu-purple);
  font-weight: 600;
  border: 1.5px solid rgba(43, 0, 88, 0.15);
  position: relative;
}
.prob-token-next {
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
  color: var(--white);
  border-color: var(--mantu-purple);
}
.prob-token-prob {
  position: absolute;
  bottom: -22px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.72rem;
  font-family: var(--font-display);
  color: var(--mantu-lila);
  font-weight: 600;
}
.prob-arrow {
  color: var(--mantu-lila);
  font-size: 1.4rem;
  font-weight: 300;
}

/* RACE framework */
.race-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 24px 0;
}
@media (max-width: 720px) { .race-grid { grid-template-columns: repeat(2, 1fr); } }
.race-cell {
  padding: 24px 20px;
  border-radius: 18px;
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.race-cell::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mantu-purple), var(--mantu-lila));
}
.race-letter {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2.4rem;
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}
.race-name { font-weight: 600; color: var(--mantu-purple); font-size: 0.95rem; margin-bottom: 6px; }
.race-desc { font-size: 0.78rem; color: var(--grey-500); line-height: 1.5; }

/* Temperature gauge */
.temp-gauge {
  position: relative;
  height: 56px;
  background: linear-gradient(90deg, #2B0058 0%, #6A3FB8 40%, #B764FF 70%, #FFD6FF 100%);
  border-radius: var(--radius-pill);
  margin: 24px 0 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
}
.temp-gauge-label {
  position: absolute;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--white);
  padding: 0 18px;
}
.temp-gauge-label.left  { left: 0; }
.temp-gauge-label.right { right: 0; color: var(--mantu-purple); }
.temp-scale {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--grey-500);
  padding: 0 4px;
}

/* Tool ecosystem map (a styled grid with categories) */
.tool-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.tool-category {
  padding: 22px 20px;
  border-radius: 18px;
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
  transition: all var(--transition);
}
.tool-category:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(43, 0, 88, 0.08);
}
.tool-category-icon {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 12px;
}
.tool-category-title {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
  font-size: 1.02rem;
  margin-bottom: 10px;
}
.tool-category ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.88rem;
}
.tool-category li { padding: 4px 0; color: var(--grey-700); }
.tool-category li::before {
  content: '→';
  color: var(--mantu-lila);
  margin-right: 8px;
  font-weight: 600;
}

/* SEO vs GEO funnel */
.compare-flow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 24px 0;
}
@media (max-width: 720px) { .compare-flow { grid-template-columns: 1fr; } }
.compare-side {
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
}
.compare-side h4 {
  font-family: var(--font-display);
  margin: 0 0 18px;
  font-size: 1.1rem;
  display: flex; align-items: center; gap: 10px;
}
.compare-side.is-seo { background: rgba(189, 189, 189, 0.08); }
.compare-side.is-seo h4 { color: var(--grey-700); }
.compare-side.is-geo {
  background: linear-gradient(135deg, rgba(255, 214, 255, 0.2), rgba(183, 100, 255, 0.1));
  border-color: rgba(183, 100, 255, 0.3);
}
.compare-side.is-geo h4 { color: var(--mantu-purple); }
.compare-flow-step {
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 10px;
  margin-bottom: 8px;
  font-size: 0.88rem;
  color: var(--grey-700);
  display: flex; align-items: center; gap: 10px;
}
.compare-flow-step-num {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--mantu-purple);
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.is-seo .compare-flow-step-num { background: var(--grey-500); }

/* 80/20 stat block */
.pie-stat {
  display: flex;
  gap: 32px;
  align-items: center;
  margin: 24px 0;
  flex-wrap: wrap;
}
.pie-stat-chart {
  width: 180px; height: 180px;
  border-radius: 50%;
  background: conic-gradient(var(--mantu-purple) 0% 80%, var(--pink-accent) 80% 100%);
  position: relative;
  flex-shrink: 0;
}
.pie-stat-chart::after {
  content: '';
  position: absolute;
  inset: 28px;
  background: var(--white);
  border-radius: 50%;
}
.pie-stat-chart-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1;
}
.pie-stat-pct {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.8rem;
  color: var(--mantu-purple);
  line-height: 1;
}
.pie-stat-pct-sub { font-size: 0.7rem; color: var(--grey-500); letter-spacing: 0.08em; text-transform: uppercase; }
.pie-stat-legend { flex: 1; min-width: 240px; }
.pie-stat-legend-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
}
.pie-stat-legend-dot {
  width: 14px; height: 14px;
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 5px;
}

/* Agent flow */
.agent-flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 28px 0;
  flex-wrap: wrap;
}
.agent-step {
  flex: 1;
  min-width: 150px;
  padding: 20px 18px;
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
  position: relative;
  text-align: center;
}
.agent-step:first-child { border-radius: 18px 0 0 18px; }
.agent-step:last-child  { border-radius: 0 18px 18px 0; }
@media (max-width: 720px) {
  .agent-step:first-child, .agent-step:last-child, .agent-step { border-radius: 14px; margin-bottom: 8px; }
}
.agent-step::after {
  content: '→';
  position: absolute;
  right: -10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--mantu-lila);
  font-size: 1.4rem;
  font-weight: 300;
  background: var(--pink-light);
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  z-index: 2;
}
.agent-step:last-child::after { display: none; }
.agent-step-icon { font-size: 1.6rem; margin-bottom: 8px; }
.agent-step-label {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
  font-size: 0.88rem;
  margin-bottom: 4px;
}
.agent-step-desc { font-size: 0.78rem; color: var(--grey-500); }

/* UX comparison cards */
.ux-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0;
}
@media (max-width: 720px) { .ux-compare { grid-template-columns: 1fr; } }
.ux-card {
  padding: 24px;
  border-radius: 18px;
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
}
.ux-card-classic { background: rgba(239, 239, 239, 0.5); }
.ux-card-classic h4 { color: var(--grey-700); }
.ux-card-gen {
  background: linear-gradient(135deg, rgba(43, 0, 88, 0.06), rgba(255, 214, 255, 0.18));
  border-color: rgba(43, 0, 88, 0.15);
}
.ux-card-gen h4 { color: var(--mantu-purple); }
.ux-card h4 { margin: 0 0 12px; font-size: 1rem; }
.ux-card .ux-illustration {
  height: 140px;
  border-radius: 12px;
  margin-bottom: 14px;
  background: var(--white);
  border: 1px dashed rgba(43, 0, 88, 0.15);
  display: flex; align-items: center; justify-content: center;
}

/* ============================================
   INTERACTIVE WIDGETS (tokens, cost, context window)
   ============================================ */

/* Tokenizer demo */
.tokenizer {
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 24px 0;
}
.tokenizer-label {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mantu-lila);
  font-weight: 600;
  margin-bottom: 8px;
}
.tokenizer-input {
  width: 100%;
  min-height: 90px;
  padding: 14px 16px;
  border: 1.5px solid rgba(43, 0, 88, 0.12);
  border-radius: 12px;
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
  outline: none;
  background: var(--pink-light);
  color: var(--grey-900);
  transition: border-color var(--transition);
}
.tokenizer-input:focus {
  border-color: var(--mantu-lila);
  background: var(--white);
}
.tokenizer-output {
  margin-top: 16px;
  padding: 18px;
  background: linear-gradient(135deg, rgba(255, 249, 254, 0.6), rgba(255, 214, 255, 0.15));
  border-radius: 12px;
  min-height: 70px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  align-content: flex-start;
  line-height: 1.9;
}
.tokenizer-token {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 6px;
  font-family: 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  font-weight: 500;
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.1);
  color: var(--mantu-purple);
  white-space: pre;
}
.tokenizer-token.is-space {
  background: rgba(43, 0, 88, 0.04);
  color: var(--grey-500);
  border-color: transparent;
}
.tokenizer-token.is-punct {
  background: rgba(183, 100, 255, 0.1);
  color: var(--mantu-lila);
  border-color: rgba(183, 100, 255, 0.2);
}
.tokenizer-stats {
  display: flex;
  gap: 24px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(43, 0, 88, 0.08);
  flex-wrap: wrap;
}
.tokenizer-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.tokenizer-stat-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--mantu-purple);
  line-height: 1;
}
.tokenizer-stat-label {
  font-size: 0.78rem;
  color: var(--grey-500);
  letter-spacing: 0.04em;
}
.tokenizer-presets {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.tokenizer-preset {
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(43, 0, 88, 0.15);
  background: var(--white);
  color: var(--mantu-purple);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.tokenizer-preset:hover {
  background: var(--pink-light);
  border-color: var(--mantu-lila);
}

/* Cost calculator */
.cost-calc {
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 24px 0;
}
.cost-calc-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 20px;
}
@media (max-width: 640px) {
  .cost-calc-row { grid-template-columns: 1fr; }
}
.cost-field { display: flex; flex-direction: column; gap: 8px; }
.cost-field-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--mantu-purple);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.cost-field-value {
  font-family: 'SF Mono', monospace;
  color: var(--mantu-lila);
  font-size: 0.85rem;
}
.cost-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--grey-50);
  border-radius: var(--radius-pill);
  outline: none;
}
.cost-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
  cursor: pointer;
  border: 3px solid var(--white);
  box-shadow: 0 2px 8px rgba(43, 0, 88, 0.25);
}
.cost-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--mantu-purple);
  cursor: pointer;
  border: 3px solid var(--white);
}
.cost-model-picker {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.cost-model {
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1.5px solid rgba(43, 0, 88, 0.12);
  background: var(--white);
  color: var(--grey-700);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.cost-model:hover {
  border-color: var(--mantu-lila);
}
.cost-model.is-active {
  background: var(--mantu-purple);
  color: var(--white);
  border-color: var(--mantu-purple);
}
.cost-result {
  padding: 24px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(43, 0, 88, 0.04), rgba(255, 214, 255, 0.15));
  border: 1px solid rgba(43, 0, 88, 0.08);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  text-align: center;
}
@media (max-width: 640px) {
  .cost-result { grid-template-columns: 1fr; gap: 12px; }
}
.cost-result-item .cost-result-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}
.cost-result-item .cost-result-label {
  font-size: 0.75rem;
  color: var(--grey-500);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* Context window bars */
.ctx-bars {
  margin: 24px 0;
}
.ctx-bar-row {
  display: grid;
  grid-template-columns: 160px 1fr 90px;
  gap: 16px;
  align-items: center;
  margin-bottom: 14px;
}
@media (max-width: 640px) {
  .ctx-bar-row { grid-template-columns: 110px 1fr 80px; gap: 8px; }
}
.ctx-bar-name {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
  font-size: 0.92rem;
}
.ctx-bar-track {
  height: 14px;
  background: var(--grey-50);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}
.ctx-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--mantu-purple), var(--mantu-lila));
  border-radius: var(--radius-pill);
  transition: width 600ms cubic-bezier(0.4, 0, 0.2, 1);
}
.ctx-bar-value {
  font-family: 'SF Mono', monospace;
  font-size: 0.85rem;
  color: var(--grey-700);
  font-weight: 500;
  text-align: right;
}
.ctx-equivalence {
  margin-top: 8px;
  padding: 12px 16px;
  background: var(--pink-light);
  border-radius: 12px;
  font-size: 0.85rem;
  color: var(--grey-700);
  border-left: 3px solid var(--mantu-lila);
}

/* Overflow visualization */
.overflow-viz {
  margin: 24px 0;
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.overflow-window {
  position: relative;
  height: 200px;
  background: linear-gradient(180deg, rgba(43, 0, 88, 0.03), rgba(255, 249, 254, 0.6));
  border: 2px dashed rgba(43, 0, 88, 0.2);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 12px;
}
.overflow-window-label {
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mantu-lila);
  font-weight: 600;
}
.overflow-tokens {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 12px;
  transition: transform 800ms cubic-bezier(0.4, 0, 0.2, 1);
}
.overflow-tok {
  padding: 3px 8px;
  background: var(--mantu-purple);
  color: var(--white);
  border-radius: 4px;
  font-size: 0.72rem;
  font-family: 'SF Mono', monospace;
  white-space: nowrap;
}
.overflow-tok.is-recent { background: var(--mantu-lila); }
.overflow-tok.is-lost {
  background: var(--grey-300);
  text-decoration: line-through;
  opacity: 0.6;
}
.overflow-controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.overflow-counter {
  margin-left: auto;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
  font-size: 0.95rem;
}

/* ============================================
   PROMPT ENGINEERING WIDGETS (RACE, Few-shot, CoT)
   ============================================ */

/* RACE builder */
.race-builder {
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 28px 0;
}
.race-builder-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 16px;
}
@media (max-width: 640px) { .race-builder-grid { grid-template-columns: 1fr; } }
.race-builder-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px;
  border-radius: 14px;
  background: var(--pink-light);
  border: 1.5px solid transparent;
  transition: border-color var(--transition);
}
.race-builder-field:focus-within { border-color: var(--mantu-lila); background: var(--white); }
.race-builder-field-header {
  display: flex;
  align-items: center;
  gap: 10px;
}
.race-builder-letter {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
  color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
}
.race-builder-name {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
  font-size: 0.95rem;
}
.race-builder-hint {
  font-size: 0.78rem;
  color: var(--grey-500);
  margin-left: 2px;
}
.race-builder-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid rgba(43, 0, 88, 0.12);
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.9rem;
  resize: vertical;
  min-height: 60px;
  background: var(--white);
  outline: none;
  color: var(--grey-900);
}
.race-builder-input:focus { border-color: var(--mantu-lila); }
.race-builder-preview {
  margin-top: 20px;
  padding: 22px;
  background: var(--mantu-purple);
  color: var(--white);
  border-radius: 16px;
  position: relative;
}
.race-builder-preview-label {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--pink-accent);
  font-weight: 600;
  margin-bottom: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.race-builder-preview-content {
  font-family: 'SF Mono', Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.7;
  white-space: pre-wrap;
  min-height: 140px;
}
.race-builder-chunk {
  display: inline;
  padding: 1px 2px;
  border-radius: 3px;
}
.race-builder-chunk-r { background: rgba(255, 214, 255, 0.18); }
.race-builder-chunk-a { background: rgba(255, 214, 255, 0.25); }
.race-builder-chunk-c { background: rgba(183, 100, 255, 0.25); }
.race-builder-chunk-e { background: rgba(183, 100, 255, 0.35); }
.race-builder-chunk-empty { color: rgba(255, 255, 255, 0.35); font-style: italic; }
.race-builder-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
/* Override prompt-btn appearance when on the white builder background */
.race-builder-actions .prompt-btn {
  background: var(--pink-light);
  color: var(--mantu-purple);
  border: 1px solid rgba(43, 0, 88, 0.12);
  font-weight: 600;
}
.race-builder-actions .prompt-btn:hover {
  background: var(--white);
  border-color: var(--mantu-lila);
  color: var(--mantu-purple);
}

/* Few-shot toggle */
.fewshot {
  background: var(--white);
  border: 1px solid rgba(43, 0, 88, 0.08);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 28px 0;
}
.fewshot-toggle {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  background: var(--pink-light);
  padding: 6px;
  border-radius: var(--radius-pill);
  margin: 16px 0 20px;
}
.fewshot-toggle-option {
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: transparent;
  border: none;
  color: var(--grey-700);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
}
.fewshot-toggle-option.is-active {
  background: var(--mantu-purple);
  color: var(--white);
  box-shadow: 0 4px 12px rgba(43, 0, 88, 0.2);
}
.fewshot-display {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 640px) { .fewshot-display { grid-template-columns: 1fr; } }
.fewshot-panel {
  padding: 18px;
  border-radius: 14px;
  background: var(--pink-light);
  border: 1px solid rgba(43, 0, 88, 0.06);
}
.fewshot-panel-label {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--mantu-lila);
  margin-bottom: 10px;
}
.fewshot-prompt {
  font-family: 'SF Mono', Menlo, monospace;
  font-size: 0.82rem;
  color: var(--grey-900);
  white-space: pre-wrap;
  line-height: 1.6;
  margin: 0;
  max-height: 280px;
  overflow-y: auto;
}
.fewshot-result {
  background: var(--white);
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 0.9rem;
  color: var(--grey-700);
  margin-top: 12px;
  border-left: 3px solid var(--mantu-lila);
}
.fewshot-result strong { color: var(--mantu-purple); }
.fewshot-quality {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
}
.fewshot-quality-label {
  font-size: 0.78rem;
  color: var(--grey-500);
  font-weight: 500;
}
.fewshot-quality-dots {
  display: flex;
  gap: 4px;
}
.fewshot-quality-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--grey-50);
  transition: background 300ms;
}
.fewshot-quality-dot.is-on {
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
}

/* Chain of Thought */
.cot-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 28px 0;
}
@media (max-width: 720px) { .cot-compare { grid-template-columns: 1fr; } }
.cot-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(43, 0, 88, 0.08);
  background: var(--white);
}
.cot-card.is-without { background: rgba(239, 239, 239, 0.4); }
.cot-card.is-with {
  background: linear-gradient(135deg, rgba(43, 0, 88, 0.04), rgba(255, 214, 255, 0.18));
  border-color: rgba(43, 0, 88, 0.15);
}
.cot-card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 14px;
}
.cot-card.is-without .cot-card-title { color: var(--grey-700); }
.cot-card.is-with .cot-card-title { color: var(--mantu-purple); }
.cot-prompt {
  font-family: 'SF Mono', monospace;
  font-size: 0.82rem;
  background: var(--white);
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 14px;
  color: var(--grey-900);
  border: 1px solid rgba(43, 0, 88, 0.08);
}
.cot-card.is-without .cot-prompt { background: rgba(255,255,255,0.6); }
.cot-answer {
  background: var(--white);
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--grey-700);
}
.cot-step {
  padding: 8px 0;
  border-bottom: 1px solid rgba(43, 0, 88, 0.06);
  font-size: 0.85rem;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 400ms, transform 400ms;
}
.cot-step.is-visible { opacity: 1; transform: translateY(0); }
.cot-step:last-child { border-bottom: 0; }
.cot-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--mantu-purple);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: 10px;
}
.cot-verdict {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
}
.cot-verdict.is-wrong { background: rgba(212, 68, 68, 0.08); color: #d44; }
.cot-verdict.is-right { background: rgba(45, 167, 117, 0.1); color: #2da775; }
.cot-replay {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: transparent;
  border: 1.5px solid var(--mantu-purple);
  color: var(--mantu-purple);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
}
.cot-replay:hover { background: var(--mantu-purple); color: var(--white); }

/* Advanced module banner */
.advanced-banner {
  margin: 0 0 32px;
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(43, 0, 88, 0.05), rgba(255, 214, 255, 0.2));
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--mantu-lila);
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.advanced-banner-icon { font-size: 1.6rem; flex-shrink: 0; }
.advanced-banner-title {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
  margin-bottom: 4px;
}
.advanced-banner p { margin: 0; color: var(--grey-700); font-size: 0.92rem; line-height: 1.55; }

/* ============================================
   QUIZ
   ============================================ */
.quiz {
  background: var(--pink-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin: 60px 0 40px;
  border: 1px solid rgba(43, 0, 88, 0.06);
}
.quiz-header { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
.quiz-header-icon {
  width: 44px; height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--mantu-purple), var(--mantu-lila));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}
.quiz-header h2 { margin: 0; font-size: 1.5rem; }
.quiz-header p { margin: 0; font-size: 0.88rem; color: var(--grey-500); }

.quiz-question {
  padding: 24px 0;
  border-top: 1px solid rgba(43, 0, 88, 0.08);
}
.quiz-question:first-of-type { border-top: 0; padding-top: 12px; }
.quiz-question-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--mantu-purple);
  margin-bottom: 16px;
}
.quiz-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  border: 1.5px solid rgba(43, 0, 88, 0.1);
  border-radius: 14px;
  background: var(--white);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.95rem;
  color: var(--grey-900);
  text-align: left;
  width: 100%;
}
.quiz-option:hover {
  border-color: var(--mantu-lila);
  background: rgba(255, 214, 255, 0.08);
}
.quiz-option-marker {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(43, 0, 88, 0.2);
  flex-shrink: 0;
  margin-top: 1px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--white);
  transition: all var(--transition);
}
.quiz-option.is-selected .quiz-option-marker {
  background: var(--mantu-purple);
  border-color: var(--mantu-purple);
}
.quiz-option.is-selected .quiz-option-marker::after { content: '✓'; }
.quiz-option.is-correct {
  border-color: #2da775;
  background: rgba(45, 167, 117, 0.06);
}
.quiz-option.is-correct .quiz-option-marker {
  background: #2da775;
  border-color: #2da775;
}
.quiz-option.is-wrong {
  border-color: #d44;
  background: rgba(212, 68, 68, 0.05);
}
.quiz-option.is-wrong .quiz-option-marker {
  background: #d44;
  border-color: #d44;
}
.quiz-option.is-wrong .quiz-option-marker::after { content: '✕'; }
.quiz-explanation {
  margin-top: 12px;
  padding: 14px 18px;
  border-radius: 12px;
  background: var(--white);
  border-left: 3px solid var(--mantu-lila);
  font-size: 0.9rem;
  color: var(--grey-700);
  display: none;
}
.quiz-explanation.is-visible { display: block; }
.quiz-explanation strong { color: var(--mantu-purple); }

.quiz-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(43, 0, 88, 0.08);
}
.quiz-score {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
}
.quiz-score.is-pass { color: #2da775; }
.quiz-score.is-fail { color: #d44; }

/* ============================================
   LESSON FOOTER NAV
   ============================================ */
.lesson-pager {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 20px;
  margin-top: 60px;
  flex-wrap: wrap;
}
.lesson-pager-card {
  flex: 1;
  min-width: 240px;
  padding: 24px 28px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(43, 0, 88, 0.1);
  transition: all var(--transition);
  display: block;
}
.lesson-pager-card:hover {
  border-color: var(--mantu-lila);
  background: var(--pink-light);
}
.lesson-pager-label {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey-500);
  margin-bottom: 4px;
}
.lesson-pager-title {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--mantu-purple);
  font-size: 1rem;
}
.lesson-pager-next { text-align: right; }

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  padding: 40px 24px;
  text-align: center;
  border-top: 1px solid rgba(43, 0, 88, 0.06);
  font-size: 0.85rem;
  color: var(--grey-500);
  background: var(--pink-light);
}
.site-footer a { color: var(--mantu-purple); font-weight: 500; }

/* ============================================
   CERTIFICATE
   ============================================ */
.cert-locked {
  text-align: center;
  padding: 80px 24px;
}
.cert-locked-icon {
  width: 96px; height: 96px;
  border-radius: 50%;
  background: var(--grey-50);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin: 0 auto 24px;
}
.cert-locked p { max-width: 520px; margin: 12px auto; }

.certificate {
  max-width: 920px;
  margin: 0 auto;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: 80px 60px 60px;
  background: radial-gradient(ellipse 100% 65% at 50% 0%, var(--mantu-purple-glow) 0%, var(--mantu-purple) 18%, #100020 55%, var(--black) 90%);
  color: var(--white);
  text-align: center;
  box-shadow: 0 24px 80px rgba(43, 0, 88, 0.18);
}
.certificate-capsule {
  position: absolute;
  border: 1.5px solid rgba(255, 255, 255, 0.12);
  border-radius: 400px;
  pointer-events: none;
}
.certificate-capsule-1 { width: 600px; height: 280px; top: -100px; right: -180px; transform: rotate(-18deg); }
.certificate-capsule-2 { width: 360px; height: 160px; bottom: -60px; left: -120px; transform: rotate(15deg); }

.cert-eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--pink-accent);
  margin-bottom: 24px;
  font-weight: 500;
}
.cert-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin: 0 0 16px;
  color: var(--white);
  letter-spacing: -0.02em;
}
.cert-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  margin: 28px 0 24px;
  color: var(--white);
  letter-spacing: -0.02em;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}
.cert-body { font-size: 1.05rem; color: rgba(255, 255, 255, 0.85); max-width: 520px; margin: 0 auto 32px; line-height: 1.65; }
.cert-meta {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-top: 60px;
  gap: 40px;
  flex-wrap: wrap;
}
.cert-meta-item { text-align: left; }
.cert-meta-label {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--pink-accent);
  margin-bottom: 6px;
}
.cert-meta-value {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--white);
  font-size: 1rem;
}
.cert-meta-logo { height: 36px; }

/* ============================================
   UTILS
   ============================================ */
.center { text-align: center; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-40 { margin-top: 40px; }
.hidden { display: none !important; }

@media (max-width: 720px) {
  .navbar-links { display: none; }
  .navbar-progress { display: none; }
  .lesson-pager { flex-direction: column; }
  .lesson-pager-next { text-align: left; }
}