/* ============================================================
   IA Y ESPACIO — DESIGN SYSTEM
   Curso de Inteligencia Artificial para Arquitectas
   Aesthetic: Seeing Theory + Architectural Elegance
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;0,8..60,700;1,8..60,300;1,8..60,400&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* === TOKENS === */
:root {
  --color-bg: #FAF8F4;
  --color-bg-alt: #F0EDE6;
  --color-bg-dark: #1A1A2E;
  --color-bg-darker: #10101E;
  --color-bg-card: #FFFFFF;
  --color-text: #2C2C2C;
  --color-text-light: #6B6B6B;
  --color-text-inverse: #FAF8F4;
  --color-heading: #1A1A2E;

  /* Semana accent colors — architectural palette */
  --s1-color: #7A8B6F;  /* sage — orientation */
  --s2-color: #4A6FA5;  /* scholarly blue — research */
  --s3-color: #B85C3A;  /* terracotta — imagination */
  --s4-color: #8B6E99;  /* lavender — depth */
  --s5-color: #5A8A7A;  /* muted teal — organization */
  --s6-color: #A67B5B;  /* warm bronze — integration */

  --color-accent: #B85C3A;
  --color-accent-glow: rgba(184, 92, 58, 0.4);
  --color-border: #E0DCD4;
  --color-border-strong: #C8C2B6;
  --color-success: #2D6B2D;
  --color-success-bg: #E8F4E8;
  --color-error: #B83232;
  --color-error-bg: #FAEAEA;

  --font-serif: 'Source Serif 4', Georgia, serif;
  --font-sans: 'DM Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --max-width: 820px;
  --nav-height: 64px;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 17px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-serif);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.72;
  min-height: 100vh;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-heading);
  line-height: 1.2;
  letter-spacing: -0.015em;
}
p { margin-bottom: var(--space-md); }
a { color: var(--color-accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.2s; }
a:hover { border-bottom-color: var(--color-accent); }
strong { font-weight: 600; }
code { font-family: var(--font-mono); font-size: 0.88em; background: var(--color-bg-alt); padding: 0.15em 0.4em; border-radius: 3px; }

/* === DARK BODY (index.html) === */
body.home-dark {
  background: #10101E;
  color: #fff;
}

/* ============================================================
   HOMEPAGE — DARK SCROLLYTELLING
   ============================================================ */

/* Canvas + glow */
#bg-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100vh;
  z-index: 0;
  pointer-events: none;
}
.ambient-glow {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100vh;
  background: radial-gradient(circle at center, transparent 0%, rgba(16, 16, 30, 0.85) 100%);
  z-index: 1;
  pointer-events: none;
}

/* --- Nav --- */
.nav {
  position: sticky;
  top: 0; z-index: 100;
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(12px);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-xl);
  box-shadow: 0 1px 8px rgba(0,0,0,0.15);
}
body.home-dark .nav {
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  position: fixed;
  width: 100%;
  transition: background 0.4s, box-shadow 0.4s;
}
body.home-dark .nav.scrolled {
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 8px rgba(0,0,0,0.15);
}
.nav__logo {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text-inverse);
  text-decoration: none;
  border: none;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.nav__logo:hover { border: none; opacity: 0.85; }
.nav__links {
  display: flex;
  gap: var(--space-lg);
  margin-left: auto;
  list-style: none;
  align-items: center;
}
.nav__links a, .nav__links button {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(250,248,244,0.55);
  text-decoration: none;
  border: none;
  background: none;
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: color 0.3s;
}
.nav__links a:hover, .nav__links button:hover { color: var(--color-text-inverse); }
.nav__radar {
  color: #A67B5B !important;
  border: 1px solid rgba(166,123,91,0.3) !important;
  border-radius: 20px;
  padding: 4px 14px;
  transition: all 0.3s;
}
.nav__radar:hover { background: rgba(166,123,91,0.15); border-color: rgba(166,123,91,0.6) !important; }
.nav__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-inverse);
  font-size: 1.5rem;
  cursor: pointer;
  margin-left: auto;
}

/* --- Hero (fullscreen) --- */
.home-hero {
  position: relative;
  width: 100%;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  z-index: 10;
}
.home-hero .hero-title {
  font-family: var(--font-sans);
  font-size: clamp(3rem, 7vw, 5rem);
  color: #ffffff;
  margin: 0 0 10px 0;
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.home-hero .hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(250,248,244,0.65);
  max-width: 640px;
  margin: 0 auto var(--space-xl) auto;
  line-height: 1.7;
  font-weight: 300;
}
.hero-meta {
  display: flex;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
  justify-content: center;
}
.hero-meta span {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: rgba(250,248,244,0.45);
  letter-spacing: 0.03em;
}
.hero-meta span strong {
  color: #fff;
  font-size: 1.1rem;
  margin-right: 4px;
}
.hero-cta {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  padding: 14px 36px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: transform 0.25s var(--ease-spring), box-shadow 0.25s;
  display: inline-block;
  text-decoration: none;
}
.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--color-accent-glow);
  border: none;
}
.scroll-hint {
  position: absolute;
  bottom: 40px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: rgba(250,248,244,0.3);
  letter-spacing: 0.08em;
  animation: scrollBounce 2s infinite;
}
@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* --- Content container --- */
.content-container {
  position: relative;
  z-index: 10;
  max-width: 1300px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl) var(--space-2xl);
}

/* --- Rhythm legend --- */
.rhythm-legend {
  margin-bottom: var(--space-3xl);
  text-align: center;
}
.rhythm-legend__inner {
  display: inline-flex;
  gap: var(--space-lg);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: var(--space-sm) var(--space-xl);
}
.rhythm-tag {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}
.rhythm-tag span {
  font-weight: 400;
  opacity: 0.5;
}
.concept-tag { color: rgba(255,255,255,0.7); }
.lab-tag { color: rgba(184,92,58,0.9); }
.radar-tag { color: rgba(166,123,91,0.9); }

/* --- Phase divider --- */
.phase-divider {
  text-align: center;
  margin: var(--space-3xl) 0 var(--space-xl);
}
.phase-divider__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--phase-color, var(--color-accent));
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}
.phase-divider__title {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: var(--space-md);
}
.phase-divider__line {
  width: 60px;
  height: 2px;
  background: var(--phase-color, var(--color-accent));
  margin: 0 auto;
  opacity: 0.5;
}

/* --- Chapter row (scrollytelling) --- */
.chapter-row {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
  min-height: 60vh;
}
.chapter-left {
  position: relative;
}
.chapter-sticky-content {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-2xl));
}
.chapter-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.chapter-title {
  font-size: 2.2rem;
  color: #fff;
  margin: var(--space-sm) 0 var(--space-md);
}
.chapter-desc {
  font-size: 0.95rem;
  color: rgba(250,248,244,0.55);
  line-height: 1.7;
}
.chapter-right {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* --- Unit cards --- */
.unit-card {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 10px;
  text-decoration: none;
  color: #fff;
  transition: transform 0.25s var(--ease-out-expo), background 0.3s, border-color 0.3s;
}
.unit-card:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.12);
  border-bottom-color: rgba(255,255,255,0.12);
}
.unit-card.completed {
  border-color: rgba(45,107,45,0.4);
}
.unit-num {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  color: #fff;
  flex-shrink: 0;
}
.unit-card.completed .unit-num {
  background: var(--color-success) !important;
}
.unit-info { min-width: 0; }
.unit-title {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.unit-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: rgba(250,248,244,0.4);
  letter-spacing: 0.04em;
}
.unit-arrow {
  font-size: 1rem;
  color: rgba(250,248,244,0.2);
  transition: color 0.2s;
}
.unit-card:hover .unit-arrow { color: rgba(250,248,244,0.5); }

/* --- Architect quote capsules --- */
.architect-quote {
  margin: var(--space-xl) 0;
  padding: var(--space-xl) var(--space-xl) var(--space-lg);
  background: rgba(255,255,255,0.03);
  border-left: 3px solid rgba(255,255,255,0.15);
  border-radius: 0 8px 8px 0;
}
.architect-quote blockquote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  color: rgba(250,248,244,0.75);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}
.architect-quote cite {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-style: normal;
  color: rgba(250,248,244,0.4);
  letter-spacing: 0.03em;
}

/* --- About / Methodology section --- */
.about-section {
  margin-top: var(--space-3xl);
  padding: var(--space-3xl) 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.about-section h2 {
  font-size: 1.8rem;
  color: #fff;
  text-align: center;
  margin-bottom: var(--space-xl);
}
.about-section p {
  color: rgba(250,248,244,0.55);
  max-width: 700px;
  margin: 0 auto var(--space-lg);
  text-align: center;
  font-size: 0.95rem;
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}
.about-card {
  padding: var(--space-xl);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 10px;
}
.about-card h4 {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: #fff;
  margin-bottom: var(--space-sm);
}
.about-card p {
  font-size: 0.85rem;
  color: rgba(250,248,244,0.5);
  text-align: left;
  margin: 0;
}

/* --- Footer --- */
.home-footer {
  text-align: center;
  padding: var(--space-2xl) 0;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: var(--space-2xl);
}
.home-footer p {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: rgba(250,248,244,0.3);
}

/* ============================================================
   MODULE PAGE
   ============================================================ */

/* --- Topbar --- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
  z-index: 100;
  box-shadow: 0 1px 6px rgba(0,0,0,0.1);
}
.topbar__menu {
  background: none; border: none;
  color: var(--color-text-inverse);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 6px;
  display: none;
}
.topbar__brand {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-text-inverse);
  text-decoration: none;
  border: none;
  margin-right: auto;
}
.topbar__brand:hover { border: none; opacity: 0.85; }
.topbar__progress {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(250,248,244,0.4);
  letter-spacing: 0.04em;
}
.topbar__theme {
  background: none;
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--color-text-inverse);
  width: 32px; height: 32px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.9rem;
  margin-left: var(--space-md);
  transition: border-color 0.2s;
}
.topbar__theme:hover { border-color: rgba(255,255,255,0.35); }

/* --- Sidebar --- */
.sidebar {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 280px;
  height: calc(100vh - var(--nav-height));
  background: var(--color-bg-dark);
  overflow-y: auto;
  padding: var(--space-lg) 0;
  z-index: 90;
  transition: transform 0.35s var(--ease-out-expo);
}
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 89;
}
.sidebar-progress {
  padding: 0 var(--space-lg) var(--space-lg);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  margin-bottom: var(--space-md);
}
.sidebar-progress__bar {
  width: 100%;
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: var(--space-xs);
}
.sidebar-progress__fill {
  height: 100%;
  background: var(--color-success);
  border-radius: 4px;
  transition: width 0.4s var(--ease-out-expo);
}
.sidebar-progress__text {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: rgba(250,248,244,0.35);
}
.nav-group {
  margin-bottom: var(--space-sm);
}
.nav-group-title {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  color: rgba(250,248,244,0.3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--space-sm) var(--space-lg);
}
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 7px var(--space-lg);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: rgba(250,248,244,0.45);
  text-decoration: none;
  border: none;
  transition: color 0.2s, background 0.2s;
}
.nav-link:hover {
  color: rgba(250,248,244,0.8);
  background: rgba(255,255,255,0.04);
  border: none;
}
.nav-link.active {
  color: #fff;
  background: rgba(255,255,255,0.08);
}
.nav-link.completed { color: var(--color-success); }
.nav-link__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.nav-link.completed .nav-link__dot {
  background: var(--color-success);
}

/* --- Main content area --- */
.main-content {
  margin-left: 280px;
  margin-top: var(--nav-height);
  min-height: calc(100vh - var(--nav-height));
}

/* --- Module hero --- */
.module-hero {
  padding: var(--space-3xl) var(--space-2xl) var(--space-2xl);
  position: relative;
  overflow: hidden;
}
.module-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  opacity: 0.12;
  background-size: 40px 40px;
  background-image:
    linear-gradient(rgba(255,255,255,0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.3) 1px, transparent 1px);
}
.module-hero__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  position: relative;
}
.module-hero__title {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  color: #fff;
  margin: var(--space-sm) 0 var(--space-md);
  position: relative;
}
.module-hero__desc {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: rgba(255,255,255,0.65);
  max-width: 600px;
  line-height: 1.7;
  position: relative;
}

/* --- Module body --- */
.module-body {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
}

/* --- Section blocks --- */
.section-block {
  margin-bottom: var(--space-2xl);
}
.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-light);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.section-header__icon {
  font-size: 1rem;
}

/* --- Concept text --- */
.concept-text {
  font-size: 1rem;
  line-height: 1.78;
}
.concept-text p {
  margin-bottom: var(--space-md);
}
.concept-text h4 {
  font-size: 1.05rem;
  margin: var(--space-xl) 0 var(--space-sm);
}

/* --- Analogy box --- */
.analogy-box {
  border-left: 3px solid #D4A853;
  background: #FFFCF5;
  padding: var(--space-lg) var(--space-xl);
  border-radius: 0 8px 8px 0;
  margin: var(--space-lg) 0;
}
.analogy-box p {
  font-size: 0.95rem;
  color: #5A4E35;
  margin: 0;
}

/* --- Case box --- */
.case-box {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-xl);
}
.case-box h4 {
  font-size: 0.95rem;
  margin-bottom: var(--space-sm);
}
.case-box p, .case-box ol, .case-box ul {
  font-size: 0.92rem;
  color: var(--color-text);
}
.case-box ol, .case-box ul {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}
.case-box li {
  margin-bottom: var(--space-xs);
}

/* --- Prompt example --- */
.prompt-example {
  background: #1e293b;
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: var(--space-lg);
  border-radius: 8px;
  margin: var(--space-md) 0;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}
.prompt-label {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  color: rgba(226,232,240,0.5);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: block;
  margin-bottom: var(--space-sm);
}

/* --- Exercise box --- */
.exercise-box {
  background: #F0F4FF;
  border: 1px solid #D0DBEF;
  border-radius: 8px;
  padding: var(--space-xl);
}
.exercise-box h4 {
  font-size: 0.95rem;
  margin-bottom: var(--space-sm);
  color: #2A4A7F;
}
.exercise-box ol, .exercise-box ul {
  padding-left: var(--space-lg);
  font-size: 0.92rem;
}
.exercise-box li {
  margin-bottom: var(--space-sm);
}

/* --- Architect capsule (in module) --- */
.architect-capsule {
  background: linear-gradient(135deg, #FAF8F4, #F0EDE6);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: var(--space-xl);
  margin: var(--space-xl) 0;
  position: relative;
}
.architect-capsule::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px;
  height: 100%;
  border-radius: 10px 0 0 10px;
}
.architect-capsule blockquote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}
.architect-capsule cite {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-style: normal;
  color: var(--color-text-light);
  display: block;
}
.architect-capsule .capsule-context {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--color-text-light);
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

/* --- Quiz section --- */
.quiz-section {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-xl);
  margin-top: var(--space-lg);
}
.quiz-question {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: var(--space-lg);
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-bg-card);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  font-family: var(--font-sans);
  font-size: 0.88rem;
}
.quiz-option:hover:not(.disabled) {
  border-color: var(--color-accent);
  background: #FFF8F6;
}
.quiz-option.disabled { pointer-events: none; opacity: 0.7; }
.quiz-option.correct {
  border-color: var(--color-success);
  background: var(--color-success-bg);
}
.quiz-option.incorrect {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}
.quiz-marker {
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all 0.2s;
}
.quiz-option.correct .quiz-marker {
  border-color: var(--color-success);
  background: var(--color-success);
  color: #fff;
}
.quiz-option.incorrect .quiz-marker {
  border-color: var(--color-error);
  background: var(--color-error);
  color: #fff;
}
.quiz-feedback {
  margin-top: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: 6px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  display: none;
}
.quiz-feedback.show { display: block; }
.quiz-feedback.correct-fb {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid rgba(45,107,45,0.2);
}
.quiz-feedback.incorrect-fb {
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid rgba(184,50,50,0.2);
}

/* Quiz result */
.quiz-result {
  text-align: center;
  padding: var(--space-xl);
  border-radius: 8px;
  margin-top: var(--space-lg);
}
.quiz-result.pass {
  background: var(--color-success-bg);
  border: 1px solid rgba(45,107,45,0.2);
}
.quiz-result.fail {
  background: var(--color-error-bg);
  border: 1px solid rgba(184,50,50,0.2);
}
.quiz-result h4 {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}
.quiz-result p {
  font-size: 0.88rem;
  margin: 0;
}
.quiz-result a, .quiz-result button {
  display: inline-block;
  margin-top: var(--space-md);
  padding: 10px 24px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
}
.quiz-result.pass a {
  background: var(--color-success);
  color: #fff;
  text-decoration: none;
}
.quiz-result.fail button {
  background: var(--color-error);
  color: #fff;
}

/* --- Module navigation --- */
.module-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-xl) 0;
  margin-top: var(--space-2xl);
  border-top: 1px solid var(--color-border);
}
.module-nav a {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: gap 0.2s;
}
.module-nav a:hover { gap: var(--space-md); border: none; }

/* ============================================================
   RADAR PAGE
   ============================================================ */
.radar-hero {
  background: var(--color-bg-dark);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.radar-rings {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.radar-ring {
  position: absolute;
  border: 1px solid rgba(166,123,91,0.15);
  border-radius: 50%;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation: radarPulse 4s infinite;
}
.radar-ring:nth-child(1) { width: 200px; height: 200px; }
.radar-ring:nth-child(2) { width: 350px; height: 350px; animation-delay: 1s; }
.radar-ring:nth-child(3) { width: 500px; height: 500px; animation-delay: 2s; }
@keyframes radarPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}
.radar-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  color: #fff;
  position: relative;
  z-index: 1;
  margin-bottom: var(--space-md);
}
.radar-hero p {
  color: rgba(250,248,244,0.55);
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0 auto;
}
.radar-content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
}
.radar-category {
  margin-bottom: var(--space-2xl);
}
.radar-category h2 {
  font-size: 1.3rem;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}
.radar-tool {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-md);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin-bottom: var(--space-md);
  transition: border-color 0.2s;
}
.radar-tool:hover {
  border-color: var(--color-accent);
}
.radar-tool__icon {
  width: 40px; height: 40px;
  background: var(--color-bg-alt);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}
.radar-tool__info h4 {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  margin-bottom: 2px;
}
.radar-tool__info p {
  font-size: 0.82rem;
  color: var(--color-text-light);
  margin: 0;
}
.radar-tool__priority {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: 20px;
  align-self: center;
}
.priority-high { background: #E8F4E8; color: var(--color-success); }
.priority-medium { background: #FFF8E8; color: #8B7A2A; }
.priority-low { background: var(--color-bg-alt); color: var(--color-text-light); }

/* ============================================================
   PROPUESTA PAGE
   ============================================================ */
.propuesta-hero {
  background: linear-gradient(135deg, var(--color-bg-dark), #1a1a3e);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
}
.propuesta-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  color: #fff;
  margin-bottom: var(--space-md);
}
.propuesta-hero p {
  color: rgba(250,248,244,0.55);
  max-width: 600px;
  margin: 0 auto;
}
.propuesta-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
}
.propuesta-section {
  margin-bottom: var(--space-2xl);
}
.propuesta-section h2 {
  font-size: 1.4rem;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}
.propuesta-section h3 {
  font-size: 1.1rem;
  margin: var(--space-lg) 0 var(--space-sm);
}
.propuesta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}
.propuesta-card {
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}
.propuesta-card h4 {
  font-size: 0.88rem;
  margin-bottom: var(--space-xs);
}
.propuesta-card p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin: 0;
}
.propuesta-timeline {
  position: relative;
  padding-left: var(--space-xl);
}
.propuesta-timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}
.timeline-item {
  position: relative;
  margin-bottom: var(--space-xl);
  padding-left: var(--space-lg);
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -22px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  background: var(--color-bg);
}
.timeline-item h4 {
  font-size: 0.95rem;
  margin-bottom: var(--space-xs);
}
.timeline-item p {
  font-size: 0.88rem;
  color: var(--color-text-light);
}

/* ============================================================
   THEME TOGGLE (light mode for module pages)
   ============================================================ */
body.light-theme {
  background: var(--color-bg);
}
body.light-theme .topbar {
  background: rgba(250,248,244,0.95);
  box-shadow: 0 1px 6px rgba(0,0,0,0.06);
}
body.light-theme .topbar__brand,
body.light-theme .topbar__menu { color: var(--color-heading); }
body.light-theme .topbar__progress { color: var(--color-text-light); }
body.light-theme .topbar__theme {
  color: var(--color-heading);
  border-color: var(--color-border);
}
body.light-theme .sidebar {
  background: var(--color-bg-card);
  border-right: 1px solid var(--color-border);
}
body.light-theme .sidebar-progress__bar { background: var(--color-bg-alt); }
body.light-theme .nav-group-title { color: var(--color-text-light); }
body.light-theme .nav-link { color: var(--color-text-light); }
body.light-theme .nav-link:hover { color: var(--color-text); background: var(--color-bg-alt); }
body.light-theme .nav-link.active { color: var(--color-heading); background: var(--color-bg-alt); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .topbar__menu { display: block; }
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }
  .main-content { margin-left: 0; }
  .chapter-row {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .chapter-sticky-content { position: static; }
  .nav__toggle { display: block; }
  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(26, 26, 46, 0.98);
    padding: var(--space-lg);
    gap: var(--space-md);
  }
  .nav__links.open { display: flex; }
}
@media (max-width: 600px) {
  .hero-meta { gap: var(--space-md); }
  .module-hero { padding: var(--space-2xl) var(--space-lg) var(--space-xl); }
  .module-body { padding: var(--space-xl) var(--space-lg); }
  .rhythm-legend__inner {
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-start;
  }
  .about-grid { grid-template-columns: 1fr; }
}