/* ============================================
   Ritchell Yamson Bookkeeping Training
   Design System: Wabi-Sabi (adapted for bookkeeping)
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Colors */
  --color-primary: #A0522D;
  --color-secondary: #8B8680;
  --color-tertiary: #FAF0E6;
  --color-neutral: #36454F;
  --color-surface: #6B7B3A;
  --color-accent: #3F51B5;
  --color-gold: #D4AF37;
  --color-blush: #E8C4B8;

  /* Derived */
  --color-bg: #FAF0E6;
  --color-bg-alt: #F5EDE0;
  --color-text: #36454F;
  --color-text-muted: #8B8680;
  --color-border: #DDD0C0;
  --color-card-bg: #FFFCF7;
  --color-primary-dark: #8B4513;

  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --space: 0.5rem;
  --container-max: 1280px;
  --section-gap: clamp(4rem, 8vw, 8rem);

  /* Transitions */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 200ms;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle paper texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(160, 82, 45, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(212, 175, 55, 0.02) 0%, transparent 50%);
  pointer-events: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

a:hover {
  color: var(--color-primary-dark);
}

ul {
  list-style: none;
}

/* --- Layout --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 3rem);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.hero__title em,
.page-hero__title em {
  font-style: italic;
  font-weight: 400;
  color: var(--color-primary);
}

h2, .section-head__title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.hero__eyebrow {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.section-head__eyebrow {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-card-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 0;
  overflow: visible;
  transition: box-shadow 300ms var(--ease);
}

.nav--scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.08);
}

.nav__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  position: relative;
  z-index: 101;
}

.nav__logo-sub {
  font-weight: 400;
  color: var(--color-primary);
  font-size: 0.8rem;
  white-space: nowrap;
}

/* --- RAY Letters Artsy Hover --- */
.ray-letters {
  display: inline-flex;
  gap: 1px;
  position: relative;
}

.ray-letter {
  position: relative;
  cursor: pointer;
  transition: all 400ms var(--ease);
  transform-origin: center bottom;
}

.ray-letter::before {
  content: attr(data-full);
  position: absolute;
  left: 50%;
  top: 100%;
  transform: translateX(-50%) translateY(-4px);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  font-style: italic;
  color: var(--color-gold);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all 400ms var(--ease);
  letter-spacing: 0.02em;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  z-index: 200;
}

.ray-letter::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 100%;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transform: translateX(-50%) translateY(0.5px);
  transition: width 400ms var(--ease) 100ms;
  opacity: 0.6;
  z-index: 200;
}

.ray-letter:hover {
  color: var(--color-gold);
  transform: translateY(-2px) scale(1.05);
}

.ray-letter:hover::before {
  opacity: 1;
  transform: translateX(-50%) translateY(2px);
}

.ray-letter:hover::after {
  width: 100%;
}

/* Stagger each letter's hover reveal */
.ray-letters .ray-letter:nth-child(1):hover::before {
  transition-delay: 0ms;
}
.ray-letters .ray-letter:nth-child(2):hover::before {
  transition-delay: 50ms;
}
.ray-letters .ray-letter:nth-child(3):hover::before {
  transition-delay: 100ms;
}

/* Hero eyebrow variant — gold letters on dark bg */
.ray-letters--hero .ray-letter {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.05em;
}

.ray-letters--hero .ray-letter::before {
  font-size: 1.75rem;
  color: var(--color-tertiary);
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.7);
  z-index: 200;
}

.ray-letters--hero .ray-letter::after {
  background: var(--color-tertiary);
  top: 100%;
  z-index: 200;
}

.ray-letters--hero .ray-letter:hover {
  color: var(--color-tertiary);
  transform: translateY(-3px) scale(1.1);
  text-shadow: 0 2px 8px rgba(212, 175, 55, 0.4);
}

.hero__eyebrow-sep {
  margin: 0 0.5rem;
  opacity: 0.5;
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
  align-items: baseline;
}

.nav__menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav__link {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--dur) var(--ease);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms var(--ease);
}

.nav__link:hover::after {
  transform: scaleX(1);
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__link--active {
  color: var(--color-primary);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(1);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--dur) var(--ease);
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 28px;
  border: none;
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  text-align: center;
  letter-spacing: 0.02em;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-tertiary);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-tertiary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-secondary);
}

.btn--ghost:hover {
  background-color: var(--color-tertiary);
  border-color: var(--color-primary);
}

.btn--full {
  width: 100%;
  display: block;
}

.btn--sm {
  font-size: 0.875rem;
  padding: 8px 16px;
  margin-top: 1rem;
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero__bg-pattern {
  position: absolute;
  inset: 0;
  background-color: var(--color-neutral);
  background-image: 
    radial-gradient(circle at 15% 25%, rgba(212, 175, 55, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 75%, rgba(160, 82, 45, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(107, 123, 58, 0.06) 0%, transparent 50%);
}

.hero__bg-pattern::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 35px,
      rgba(212, 175, 55, 0.03) 35px,
      rgba(212, 175, 55, 0.03) 36px
    );
}

.hero__bg-pattern::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 35px,
      rgba(160, 82, 45, 0.025) 35px,
      rgba(160, 82, 45, 0.025) 36px
    );
}

.hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(54, 69, 79, 0.92) 0%,
    rgba(54, 69, 79, 0.75) 50%,
    rgba(54, 69, 79, 0.85) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hero__text {
  max-width: 640px;
}

.hero__eyebrow {
  color: var(--color-gold);
}

.hero__title {
  color: var(--color-tertiary);
  margin-bottom: 1.5rem;
}

.hero__title em {
  color: var(--color-gold);
}

.hero__subtitle {
  font-size: 1.2rem;
  color: var(--color-tertiary);
  opacity: 0.92;
  line-height: 1.75;
  margin-bottom: 2.5rem;
  max-width: 560px;
}

.hero__actions {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.hero__actions .btn {
  padding: 14px 32px;
  font-size: 1.05rem;
}

/* --- Stats bar --- */
.stats {
  background-color: var(--color-neutral);
  padding: 3.5rem 0;
  border-bottom: 1px solid rgba(139, 134, 128, 0.15);
}

.stats__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat__number {
  display: block;
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1;
  margin-bottom: 0.625rem;
}

.stat__label {
  font-size: 0.8rem;
  color: var(--color-tertiary);
  opacity: 0.75;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* --- Section Head --- */
.section-head {
  margin-bottom: 3.5rem;
  max-width: 680px;
}

/* --- Features --- */
.features {
  padding: var(--section-gap) 0;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
  display: flex;
  flex-direction: column;
}

.feature-card:nth-child(1) {
  grid-column: auto;
  display: flex;
  grid-template-columns: none;
  gap: 0;
}

.feature-card:nth-child(1) .feature-card__icon {
  margin-bottom: 1rem;
}

.feature-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.07);
  transform: translateY(-3px);
  border-color: var(--color-primary);
}

.feature-card__image {
  width: 100%;
  height: 160px;
  overflow: hidden;
}

.feature-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms var(--ease);
}

.feature-card:hover .feature-card__image img {
  transform: scale(1.05);
}

.feature-card__body {
  padding: 1.5rem;
}

.feature-card__icon {
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.feature-card__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card__text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* --- About Preview --- */
.about-preview {
  padding: var(--section-gap) 0;
  background-color: var(--color-bg-alt);
}

.about-preview__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

.about-preview__image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--color-border);
}

.about-preview__content {
  max-width: 480px;
}

.about-preview__bio {
  margin-bottom: 1.5rem;
  color: var(--color-text);
  line-height: 1.75;
}

.about-preview__content .btn {
  margin-top: 1rem;
}

/* --- Training Preview --- */
.training-preview {
  padding: var(--section-gap) 0;
}

.training-preview__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

.training-preview__image img {
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
}

.training-preview__text {
  font-size: 1.1rem;
  margin-bottom: 1.75rem;
  line-height: 1.75;
}

.training-preview__list {
  margin-bottom: 2rem;
}

.training-preview__list li {
  padding: 0.625rem 0;
  padding-left: 1.75rem;
  position: relative;
  color: var(--color-text);
  font-size: 1rem;
}

.training-preview__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.9rem;
  width: 8px;
  height: 1px;
  background-color: var(--color-primary);
}

/* --- CTA --- */
.cta {
  padding: var(--section-gap) 0;
  background-color: var(--color-neutral);
}

.cta__box {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
  padding: 1rem 0;
}

.cta__title {
  color: var(--color-tertiary);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 1rem;
}

.cta__text {
  color: var(--color-tertiary);
  opacity: 0.85;
  font-size: 1.15rem;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.cta__contact {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
}

.cta__contact-link {
  color: var(--color-gold);
  font-size: 0.95rem;
}

.cta__contact-link:hover {
  color: var(--color-tertiary);
}

.cta__contact-sep {
  color: var(--color-secondary);
}

/* --- Lesson Page --- */
.lesson-nav {
  background-color: var(--color-card-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}

.lesson-nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.lesson-nav__back {
  font-size: 0.95rem;
  color: var(--color-primary);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: gap var(--dur) var(--ease);
}

.lesson-nav__back:hover {
  gap: 0.75rem;
}

.lesson-nav__progress {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson {
  padding: 3rem 0 var(--section-gap);
}

.lesson__main {
  max-width: 760px;
}

.lesson__layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3rem;
  align-items: start;
}

/* Sidebar */
.lesson__sidebar {
  position: sticky;
  top: 80px;
}

.lesson__sidebar-sticky {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
}

.lesson__sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

.lesson__toc {
  display: grid;
  gap: 0.4rem;
}

.lesson__toc {
  list-style: decimal;
  padding-left: 1.25rem;
}

.lesson__toc li {
  list-style: decimal;
}

.lesson__toc-link {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--dur) var(--ease);
}

.lesson__toc-link:hover {
  color: var(--color-primary);
}

.lesson__toc-link--active {
  color: var(--color-primary);
  font-weight: 600;
}

.lesson__sidebar-divider {
  height: 1px;
  background-color: var(--color-border);
  margin: 1.5rem 0;
}

.lesson__sidebar-heading {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.lesson__checklist {
  display: grid;
  gap: 0.5rem;
}

.lesson__checklist label {
  font-size: 0.85rem;
  color: var(--color-text);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  cursor: pointer;
  line-height: 1.5;
}

.lesson__checklist input[type="checkbox"] {
  margin-top: 0.2rem;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

/* Main content */
.lesson__main {
  max-width: 760px;
}

.lesson__topic {
  margin-bottom: 1rem;
}

.lesson__topic-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.lesson__topic-intro {
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--color-text);
  margin-bottom: 1.75rem;
}

.lesson__subheading {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.lesson__text {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-text);
  margin-bottom: 1.25rem;
}

.lesson__divider {
  height: 1px;
  background-color: var(--color-border);
  margin: 3rem 0;
}

/* Callout */
.lesson__callout {
  background-color: var(--color-bg-alt);
  border-left: 3px solid var(--color-primary);
  padding: 1.75rem;
  margin: 1.75rem 0;
}

.lesson__callout-formula {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-primary);
  text-align: center;
  letter-spacing: 0.03em;
}

.lesson__callout-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 0.5rem;
  font-style: italic;
}

/* Table */
.lesson__table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.lesson__table th {
  text-align: left;
  font-weight: 600;
  color: var(--color-text);
  padding: 0.875rem 1.25rem;
  border-bottom: 2px solid var(--color-primary);
  background-color: var(--color-bg-alt);
  font-size: 0.95rem;
}

.lesson__table td {
  padding: 0.875rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.95rem;
}

.lesson__table tr:last-child td {
  border-bottom: none;
}

/* Tip */
.lesson__tip {
  background-color: rgba(212, 175, 55, 0.07);
  border: 1px solid rgba(212, 175, 55, 0.25);
  padding: 1.5rem;
  margin: 1.75rem 0;
}

.lesson__tip-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.lesson__tip-text {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
  font-style: italic;
}

/* Lists */
.lesson__terms {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0;
}

.lesson__terms li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text);
  line-height: 1.6;
}

.lesson__terms li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 1px;
  background-color: var(--color-primary);
}

.lesson__numbered {
  padding-left: 1.5rem;
  display: grid;
  gap: 0.5rem;
  margin: 1rem 0;
}

.lesson__numbered li {
  color: var(--color-text);
  line-height: 1.6;
}

.lesson__bullet {
  display: grid;
  gap: 0.5rem;
  margin: 1rem 0;
}

.lesson__bullet li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text);
  line-height: 1.6;
}

.lesson__bullet li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 1px;
  background-color: var(--color-secondary);
}

/* Steps */
.lesson__steps {
  counter-reset: step;
  display: grid;
  gap: 1.25rem;
  margin: 1.5rem 0;
  padding-left: 0;
  list-style: none;
}

.lesson__steps li {
  position: relative;
  padding-left: 3.25rem;
  color: var(--color-text);
  line-height: 1.65;
  padding-top: 0.25rem;
  padding-bottom: 0.25rem;
}

.lesson__steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.lesson__steps li p {
  margin-top: 0.25rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* Exercise */
.lesson__exercise {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  padding: 2.5rem;
}

.lesson__exercise-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.lesson__exercise-intro {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

/* Cheat sheet */
.lesson__cheatsheet-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.lesson__cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.lesson__cheatsheet-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
}

.lesson__cheatsheet-card h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.lesson__cheatsheet-card ul {
  display: grid;
  gap: 0.4rem;
}

.lesson__cheatsheet-card li {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.5;
  padding-left: 1rem;
  position: relative;
}

.lesson__cheatsheet-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 1px;
  background-color: var(--color-secondary);
}

/* Next lesson */
.lesson__next {
  margin-top: 2rem;
}

.lesson__next-box {
  background-color: var(--color-neutral);
  padding: 2.5rem;
  text-align: center;
}

.lesson__next-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  margin-bottom: 0.5rem;
}

.lesson__next-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-tertiary);
  margin-bottom: 0.5rem;
}

.lesson__next-desc {
  font-size: 0.95rem;
  color: var(--color-tertiary);
  opacity: 0.8;
  margin-bottom: 1.5rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.lesson__next-box .btn--ghost {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.lesson__next-box .btn--ghost:hover {
  background-color: rgba(212, 175, 55, 0.1);
}

/* --- Footer --- */
.footer {
  background-color: var(--color-neutral);
  padding: 2rem 0;
  border-top: 1px solid rgba(139, 134, 128, 0.2);
}

.footer__text {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-tertiary);
  opacity: 0.6;
}

/* --- Page Hero --- */
.page-hero {
  padding: 6rem 0 4.5rem;
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.page-hero--training {
  position: relative;
  padding: 9rem 0 6.5rem;
  overflow: hidden;
}

.page-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(54, 69, 79, 0.88) 0%,
    rgba(160, 82, 45, 0.6) 100%
  );
}

.page-hero--training .container {
  position: relative;
  z-index: 1;
}

.page-hero--training .hero__eyebrow,
.page-hero--training .page-hero__title,
.page-hero--training .page-hero__subtitle {
  color: var(--color-tertiary);
}

.page-hero--training .page-hero__title em {
  color: var(--color-gold);
}

.page-hero__title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.page-hero__subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 580px;
  line-height: 1.75;
}

/* --- Bio Section --- */
.bio {
  padding: var(--section-gap) 0;
}

.bio__grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: start;
}

.bio__image img {
  width: 100%;
  border: 1px solid var(--color-border);
}

.bio__role {
  font-size: 1rem;
  color: var(--color-primary);
  font-weight: 500;
  letter-spacing: 0.03em;
  margin-bottom: 1.5rem;
}

.bio__text {
  margin-bottom: 1.5rem;
  line-height: 1.75;
  color: var(--color-text);
  font-size: 1.05rem;
}

.bio__quote {
  border-left: 3px solid var(--color-primary);
  padding-left: 1.75rem;
  margin-bottom: 1.75rem;
}

.bio__quote .bio__text {
  font-style: italic;
  color: var(--color-neutral);
  margin-bottom: 0;
}

.bio__contact {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  display: grid;
  gap: 0.5rem;
}

.bio__contact-item {
  font-size: 0.95rem;
  color: var(--color-text);
}

.bio__contact-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-right: 0.75rem;
}

.bio__contact-item a {
  color: var(--color-primary);
}

/* --- Skills --- */
.skills {
  padding: var(--section-gap) 0;
  background-color: var(--color-bg-alt);
}

.skills__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
}

.skill-group__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.skill-group__list {
  display: grid;
  gap: 0.75rem;
}

.skill-group__list li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text);
  line-height: 1.6;
  font-size: 1.02rem;
  padding-top: 0.4rem;
  padding-bottom: 0.4rem;
}

.skill-group__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 1px;
  background-color: var(--color-secondary);
}

/* --- Timeline --- */
.timeline {
  padding: var(--section-gap) 0;
}

.timeline__list {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
}

.timeline__list::before {
  content: '';
  position: absolute;
  left: 140px;
  top: 0;
  bottom: 0;
  width: 1px;
  background-color: var(--color-border);
}

.timeline-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  position: relative;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item__year {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-primary);
  text-align: right;
  padding-top: 0.25rem;
  font-weight: 500;
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: 136px;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  background-color: var(--color-primary);
  border-radius: 0;
  border: 2px solid var(--color-bg);
  transform: rotate(45deg);
}

.timeline-item__role {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-item__company {
  font-size: 1rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.timeline-item__desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.timeline-item__details {
  display: grid;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.timeline-item__details li {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  padding-left: 1.25rem;
  position: relative;
  padding-top: 0.2rem;
  padding-bottom: 0.2rem;
}

.timeline-item__details li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 1px;
  background-color: var(--color-secondary);
}

/* --- Education --- */
.education {
  padding: var(--section-gap) 0;
  background-color: var(--color-bg-alt);
}

.education__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.edu-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 2.25rem;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.edu-card:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.edu-card__degree {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.edu-card__school {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.edu-card__year {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --- Course Format --- */
.course-format {
  padding: var(--section-gap) 0;
  background-color: var(--color-bg-alt);
}

.course-format__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.format-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 2.25rem;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.format-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.07);
  transform: translateY(-3px);
  border-color: var(--color-primary);
}

.format-card__icon {
  color: var(--color-primary);
  margin-bottom: 1.25rem;
}

.format-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.format-card__text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Course Overview --- */
.course-overview {
  padding: var(--section-gap) 0;
}

.course-overview__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.course-module {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--color-border);
}

.course-module:last-child,
.course-module:nth-last-child(2) {
  border-bottom: none;
  padding-bottom: 0;
}

.course-module__number {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-primary);
  opacity: 0.5;
}

.course-module__title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.course-module__text {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.course-module__topics {
  display: grid;
  gap: 0.5rem;
}

.course-module__topics li {
  font-size: 0.9rem;
  color: var(--color-text);
  padding-left: 1.25rem;
  position: relative;
}

.course-module__topics li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 1px;
  background-color: var(--color-secondary);
}

/* --- Course Details --- */
.course-details {
  padding: var(--section-gap) 0;
  background-color: var(--color-bg-alt);
}

.course-details__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.course-details__image img {
  width: 100%;
  border: 1px solid var(--color-border);
}

.course-details__list {
  display: grid;
  gap: 1rem;
}

.course-details__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 1.05rem;
  color: var(--color-text);
  line-height: 1.5;
}

.course-details__list svg {
  color: var(--color-surface);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

/* --- Pricing --- */
.pricing {
  padding: var(--section-gap) 0;
}

.pricing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.pricing-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 2.5rem 2.25rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.pricing-card:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.pricing-card--featured {
  border-color: var(--color-primary);
  border-width: 2px;
  background-color: var(--color-card-bg);
}

.pricing-card__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-primary);
  color: var(--color-tertiary);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 14px;
}

.pricing-card__name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.pricing-card__desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.pricing-card__price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2rem;
}

.pricing-card__price span {
  font-size: 2.5rem;
}

.pricing-card__features {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.pricing-card__features li {
  font-size: 0.95rem;
  color: var(--color-text);
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
}

.pricing-card__features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 1px;
  background-color: var(--color-primary);
}

/* --- FAQ --- */
.faq {
  padding: var(--section-gap) 0;
  background-color: var(--color-bg-alt);
}

.faq__list {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

.faq-item {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 0;
  transition: border-color var(--dur) var(--ease);
}

.faq-item[open] {
  border-color: var(--color-primary);
}

.faq-item__question {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  padding: 1.5rem 1.75rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item__question::-webkit-details-marker {
  display: none;
}

.faq-item__question::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--dur) var(--ease);
}

.faq-item[open] .faq-item__question::after {
  transform: rotate(45deg);
}

.faq-item__answer {
  padding: 0 1.75rem 1.5rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  font-size: 1rem;
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__text {
  animation: fadeInUp 420ms var(--ease) both;
}

.hero__eyebrow {
  animation-delay: 80ms;
}

.hero__title {
  animation-delay: 160ms;
}

.hero__subtitle {
  animation-delay: 240ms;
}

.hero__actions {
  animation-delay: 320ms;
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Hero Scroll Indicator --- */
.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.hero__scroll-text {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gold);
  opacity: 0.7;
}

.hero__scroll-chevron {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: chevronBounce 2s var(--ease) infinite;
}

.hero__scroll-chevron svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-gold);
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

@keyframes chevronBounce {
  0%, 100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  50% {
    transform: translateY(6px);
    opacity: 1;
  }
}

/* --- Kintsugu Line on Hero Title --- */
.hero__title {
  position: relative;
}

.hero__title::after {
  content: '';
  display: block;
  width: 80px;
  height: 2px;
  margin-top: 1rem;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-gold) 20%,
    var(--color-gold) 80%,
    transparent 100%
  );
  opacity: 0.8;
}

/* --- Why RAY Section --- */
.why-ray {
  padding: var(--section-gap) 0;
  background-color: var(--color-bg-alt);
}

.why-ray__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.why-ray__card {
  text-align: center;
  padding: 2.5rem 1.5rem;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-gold);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.why-ray__card:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transform: translateY(-3px);
}

.why-ray__number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.why-ray__label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --- Enhanced Footer --- */
.footer {
  background-color: var(--color-neutral);
  padding: 3rem 0 1.5rem;
  border-top: 1px solid rgba(139, 134, 128, 0.2);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: -0.01em;
}

.footer__brand-sub {
  font-size: 0.85rem;
  color: var(--color-tertiary);
  opacity: 0.7;
}

.footer__col-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  margin-bottom: 1rem;
}

.footer__links {
  display: grid;
  gap: 0.5rem;
}

.footer__links a {
  color: var(--color-tertiary);
  opacity: 0.8;
  font-size: 0.9rem;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.footer__links a:hover {
  color: var(--color-gold);
  opacity: 1;
}

.footer__contact-item {
  font-size: 0.9rem;
  color: var(--color-tertiary);
  opacity: 0.8;
  margin-bottom: 0.5rem;
}

.footer__contact-item a {
  color: var(--color-tertiary);
  opacity: 0.8;
}

.footer__contact-item a:hover {
  color: var(--color-gold);
  opacity: 1;
}

.footer__bottom {
  border-top: 1px solid rgba(139, 134, 128, 0.2);
  padding-top: 1.5rem;
  text-align: center;
}

.footer__text {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-tertiary);
  opacity: 0.5;
}

/* --- Back to Top Button --- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 46px;
  height: 46px;
  background-color: var(--color-neutral);
  border: 1px solid var(--color-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms var(--ease), transform 300ms var(--ease), background-color 300ms var(--ease);
  z-index: 90;
  border-radius: 0;
}

.back-to-top--visible {
  opacity: 0.85;
  pointer-events: auto;
}

.back-to-top:hover {
  background-color: var(--color-primary);
  transform: translateY(-3px);
  opacity: 1;
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-gold);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* --- Timeline Hover Effect --- */
.timeline-item__body {
  padding-left: 1rem;
  border-left: 2px solid transparent;
  transition: border-color 300ms var(--ease);
}

.timeline-item:hover .timeline-item__body {
  border-left-color: var(--color-gold);
}

/* --- Pricing Card Hover Lift --- */
.pricing-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}

.pricing-card--featured {
  transform: scale(1.02);
}

.pricing-card--featured:hover {
  transform: scale(1.02) translateY(-4px);
}

/* --- Page Hero Topic (no image) --- */
.page-hero--topic {
  background-color: var(--color-neutral);
  padding: 5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.page-hero--topic::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 15% 30%, rgba(212, 175, 55, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 70%, rgba(160, 82, 45, 0.1) 0%, transparent 45%);
  pointer-events: none;
}

.page-hero--topic .container {
  position: relative;
  z-index: 1;
}
.page-hero--topic .hero__eyebrow { color: var(--color-gold); }
.page-hero--topic .page-hero__title { color: var(--color-tertiary); }
.page-hero--topic .page-hero__title em { color: var(--color-gold); }
.page-hero--topic .page-hero__subtitle { color: var(--color-tertiary); opacity: 0.8; }

/* --- Quiz --- */
.topic-progress {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--color-border);
  z-index: 99;
}
.topic-progress__bar {
  height: 100%;
  background-color: var(--color-gold);
  transition: width 400ms var(--ease);
}

.quiz {
  padding: 2.5rem;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  margin-top: 2rem;
}
.quiz__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.quiz__subtitle {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  font-style: italic;
}
.quiz__question {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}
.quiz__question:first-of-type {
  margin-top: 0;
}
.quiz__options {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
.quiz__option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
  font-size: 0.95rem;
  color: var(--color-text);
  background-color: var(--color-card-bg);
}
.quiz__option:hover {
  border-color: var(--color-primary);
  background-color: var(--color-bg-alt);
}
.quiz__option input[type="radio"] {
  accent-color: var(--color-primary);
  flex-shrink: 0;
}
.quiz__option--correct {
  border-color: #6B7B3A;
  background-color: rgba(107, 123, 58, 0.1);
  font-weight: 500;
}
.quiz__option--correct::after {
  content: ' \2713';
  color: #6B7B3A;
  font-weight: 700;
  margin-left: auto;
}
.quiz__option--wrong {
  border-color: #C0392B;
  background-color: rgba(192, 57, 43, 0.08);
}
.quiz__option--wrong::after {
  content: ' \2717';
  color: #C0392B;
  font-weight: 700;
  margin-left: auto;
}
.quiz__check {
  margin-top: 2rem;
}
.quiz__result {
  margin-top: 1.5rem;
  font-size: 1.1rem;
  display: none;
  padding: 1.25rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-alt);
  text-align: center;
}
.quiz__result--show {
  display: block;
}
.quiz__result--perfect {
  border-color: #6B7B3A;
  color: #6B7B3A;
  background-color: rgba(107, 123, 58, 0.08);
}
.quiz__result--pass {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.quiz__result--fail {
  border-color: #C0392B;
  color: #C0392B;
  background-color: rgba(192, 57, 43, 0.05);
}

/* --- Topic Nav (prev/next between topics) --- */
.topic-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2.5rem;
}
.topic-nav__link {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.topic-nav__link:hover {
  border-color: var(--color-primary);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}
.topic-nav__link--next {
  text-align: right;
}
.topic-nav__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}
.topic-nav__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* --- Day 1 Topic Cards Grid --- */
.topic-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}
.topic-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.topic-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.07);
  transform: translateY(-3px);
  border-color: var(--color-primary);
}
.topic-card__number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-gold);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}
.topic-card__title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.topic-card__desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 1rem;
}
.topic-card__link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: gap var(--dur) var(--ease);
}
.topic-card__link:hover {
  gap: 0.75rem;
}

@media (max-width: 768px) {
  .topic-cards {
    grid-template-columns: 1fr;
  }
  .topic-nav {
    grid-template-columns: 1fr;
  }
}

/* --- Day 1 TOC Active Highlight --- */
.lesson__toc-link--active {
  color: var(--color-primary);
  font-weight: 600;
  position: relative;
}

.lesson__toc-link--active::before {
  content: '';
  position: absolute;
  left: -1rem;
  top: 0.35rem;
  width: 4px;
  height: 0.8rem;
  background-color: var(--color-gold);
}

/* --- Accessibility --- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.btn:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  .course-format__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .why-ray__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .why-ray__grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero__scroll {
    display: none;
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-card-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
    gap: 0;
    transform: translateY(-100%);
    opacity: 0;
    transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
    pointer-events: none;
  }

  .nav__menu--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav__link:last-child {
    border-bottom: none;
  }

  .stats__container {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .course-format__grid,
  .features__grid,
  .about-preview__grid,
  .training-preview__grid,
  .bio__grid,
  .skills__grid,
  .course-overview__grid,
  .course-details__grid,
  .pricing__grid,
  .education__grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .feature-card:nth-child(1) {
    grid-column: 1;
    display: flex;
  }
  }

  .lesson__layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .lesson__sidebar {
    position: relative;
    top: 0;
  }

  .lesson__cheatsheet-grid {
    grid-template-columns: 1fr;
  }

  .why-ray__grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .timeline__list::before {
    left: 8px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding-left: 2rem;
  }

  .timeline-item__year {
    text-align: left;
  }

  .timeline-item::after {
    left: 4px;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .pricing-card {
    padding: 2rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .stats__container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .course-module {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}