/* ============================================
   STYLE — Layout, Typography, Components
   ============================================ */

@layer base {
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
  }

  body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-feature-settings: 'cv01', 'ss01';
    transition:
      background-color var(--duration-theme) var(--ease-out),
      color var(--duration-theme) var(--ease-out);
    overflow-x: hidden;
  }

  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }
  button { font-family: inherit; cursor: pointer; border: none; background: none; }
  ul { list-style: none; }
  em, i { font-style: italic; }
  strong { font-weight: 600; }

  /* Consistent, single-accent focus treatment */
  :focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 3px;
    border-radius: var(--r-xs);
  }

  /* Reveal initial state — only when JS is active, so no-JS users see content.
     Motion animates these to their final state; reduced-motion shows them at once. */
  .js .reveal,
  .js .reveal-stagger > * { opacity: 0; }

  @media (prefers-reduced-motion: reduce) {
    .js .reveal,
    .js .reveal-stagger > * { opacity: 1; }
  }
}

@layer components {
  /* ── Scroll Progress Bar ── */
  .scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 100%;
    transform: scaleX(0);
    transform-origin: 0 50%;
    background: linear-gradient(90deg, var(--p1-mid), var(--p2-mid), var(--p3-mid), var(--p4-mid), var(--p5-mid));
    z-index: 1000;
    will-change: transform;
  }

  /* ── Fixed corner theme toggle (always visible, outside hero stack) ── */
  .theme-toggle-fixed {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 950;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: var(--r-pill);
    border: 1px solid var(--border-subtle);
    background: var(--nav-bg);
    backdrop-filter: blur(12px) saturate(160%);
    -webkit-backdrop-filter: blur(12px) saturate(160%);
    color: var(--text-secondary);
    transition:
      background var(--duration-base) var(--ease-out),
      transform var(--duration-fast) var(--ease-spring),
      box-shadow var(--duration-base) var(--ease-out),
      opacity var(--duration-slow) var(--ease-out);
  }
  .theme-toggle-fixed:hover { background: var(--bg-secondary); transform: scale(1.06); box-shadow: var(--shadow-sm); }
  .theme-toggle-fixed:active { transform: scale(0.96); }
  .theme-toggle-fixed svg { width: 18px; height: 18px; }

  /* Hide the corner toggle once the sticky nav (with its own toggle) is showing */
  body.nav-active .theme-toggle-fixed { opacity: 0; pointer-events: none; }

  /* ── Sticky Nav ── */
  .sticky-nav {
    position: fixed;
    top: 3px;
    left: 0;
    right: 0;
    z-index: 900;
    transform: translateY(-110%);
    transition: transform var(--duration-slow) var(--ease-out);
    background: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
  }

  .sticky-nav.visible { transform: translateY(0); }

  .sticky-nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 60px;
    display: flex;
    align-items: center;
    gap: 1rem;
  }

  .sticky-nav-label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
  }

  .mini-timeline {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
    flex: 1;
    padding: 4px 0;
    scroll-snap-type: x proximity;
  }
  .mini-timeline::-webkit-scrollbar { display: none; }

  .mini-dot {
    scroll-snap-align: center;
    width: 24px;
    height: 24px;
    border-radius: var(--r-pill);
    border: 2px solid var(--border-subtle);
    background: var(--bg-card);
    cursor: pointer;
    transition:
      transform var(--duration-base) var(--ease-spring),
      box-shadow var(--duration-base) var(--ease-out),
      background var(--duration-base) var(--ease-out);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.55rem;
    font-weight: 500;
    color: var(--text-muted);
    position: relative;
  }

  .mini-dot:hover { transform: scale(1.3); }

  .mini-dot.active {
    background: var(--dot-color, var(--p1-mid));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 0 0 3px var(--dot-glow, var(--p1-glow));
  }

  /* ── Theme Toggle (sticky nav variant) ── */
  .theme-toggle-small {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: var(--r-pill);
    border: 1px solid var(--border-subtle);
    background: var(--bg-card);
    color: var(--text-secondary);
    flex-shrink: 0;
    transition:
      background var(--duration-base) var(--ease-out),
      transform var(--duration-fast) var(--ease-spring);
  }
  .theme-toggle-small:hover { background: var(--bg-secondary); transform: scale(1.1); }
  .theme-toggle-small svg { width: 15px; height: 15px; }

  /* Sun/moon icon toggling (Lucide-generated svgs keep these classes) */
  .icon-moon { display: none; }
  [data-theme="dark"] .icon-sun { display: none; }
  [data-theme="dark"] .icon-moon { display: block; }

  /* ── Container ── */
  .container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 1.5rem;
  }

  /* ── Section base ── */
  .section { padding: 6rem 0; }
  @media (max-width: 640px) { .section { padding: 3.5rem 0; } }

  /* ── Shared eyebrow (mono, capped usage) ── */
  .eyebrow {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-muted);
  }
}

/* ── Hero ── */
@layer hero {
  .hero {
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5rem 1.5rem 0;
    position: relative;
    overflow: hidden;
    background: var(--bg-primary);
    gap: 2.5rem;
  }

  .hero-bg-gradient {
    position: absolute;
    inset: 0;
    background:
      radial-gradient(ellipse 80% 55% at 50% -10%, color-mix(in srgb, var(--p1-mid) 14%, transparent), transparent 70%),
      radial-gradient(ellipse 55% 45% at 100% 85%, color-mix(in srgb, var(--p5-mid) 10%, transparent), transparent 70%);
    pointer-events: none;
    transition: opacity var(--duration-theme) var(--ease-out);
  }

  [data-theme="dark"] .hero-bg-gradient {
    background:
      radial-gradient(ellipse 80% 55% at 50% -10%, color-mix(in srgb, var(--p1-mid) 9%, transparent), transparent 70%),
      radial-gradient(ellipse 55% 45% at 100% 85%, color-mix(in srgb, var(--p5-mid) 7%, transparent), transparent 70%);
  }

  .hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
    max-width: 760px;
  }

  .hero-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
  }

  .hero-title {
    font-family: var(--font-sans);
    font-size: clamp(2.9rem, 8.5vw, 6.25rem);
    font-weight: 600;
    line-height: 0.98;
    letter-spacing: -0.035em;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
  }

  .hero-title em {
    font-family: var(--font-serif);
    font-weight: 400;
    font-style: italic;
    letter-spacing: -0.01em;
  }

  .hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    font-weight: 400;
    margin: 0 auto 2rem;
    max-width: 30rem;
    line-height: 1.6;
  }

  .hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.4rem;
    border-radius: var(--r-pill);
    background: var(--brand);
    color: var(--text-inverse);
    font-size: 0.9rem;
    font-weight: 500;
    transition:
      transform var(--duration-fast) var(--ease-spring),
      box-shadow var(--duration-base) var(--ease-out),
      opacity var(--duration-base) var(--ease-out);
  }
  .hero-cta:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
  .hero-cta:active { transform: translateY(0); }
  .hero-cta svg { width: 16px; height: 16px; }

  /* ── Timeline ── */
  .timeline-container {
    width: 100%;
    max-width: 1100px;
    padding: 1rem 2rem 2rem;
    position: relative;
    z-index: 1;
  }

  .timeline {
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: 0.5rem;
    gap: 0;
    scroll-snap-type: x proximity;
  }
  .timeline::-webkit-scrollbar { display: none; }

  .timeline::before {
    content: '';
    position: absolute;
    top: 19px;
    left: 20px;
    right: 20px;
    height: 2px;
    background: var(--border-subtle);
    z-index: 0;
  }

  .timeline-dot-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 52px;
    cursor: pointer;
    position: relative;
    z-index: 1;
    scroll-snap-align: center;
  }

  .timeline-dot {
    width: 38px;
    height: 38px;
    border-radius: var(--r-pill);
    background: var(--bg-card);
    border: 2px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    transition:
      transform var(--duration-base) var(--ease-spring),
      box-shadow var(--duration-base) var(--ease-out),
      background var(--duration-base) var(--ease-out),
      border-color var(--duration-base) var(--ease-out);
    position: relative;
  }

  .timeline-dot-wrap:hover .timeline-dot {
    transform: scale(1.25) translateY(-4px);
    box-shadow: 0 6px 20px var(--dot-glow, rgba(0,0,0,0.15));
  }

  .timeline-dot-wrap.active .timeline-dot {
    background: var(--dot-color);
    border-color: transparent;
    box-shadow: 0 0 0 4px var(--dot-glow), var(--shadow-sm);
  }

  .timeline-dot-label {
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--dot-color, var(--text-muted));
    white-space: nowrap;
    text-align: center;
    transition: color var(--duration-base) var(--ease-out);
  }

  .timeline-dot-wrap:hover .timeline-dot-label,
  .timeline-dot-wrap.active .timeline-dot-label { color: var(--dot-color); }

  .timeline-theme-label {
    font-size: 0.62rem;
    color: var(--text-muted);
    white-space: nowrap;
    text-align: center;
    max-width: 72px;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0;
    transform: translateY(4px);
    transition:
      opacity var(--duration-base) var(--ease-out),
      transform var(--duration-base) var(--ease-out);
  }

  .timeline-dot-wrap:hover .timeline-theme-label,
  .timeline-dot-wrap.active .timeline-theme-label {
    opacity: 1;
    transform: translateY(0);
  }

  @media (max-width: 720px) {
    .timeline-dot { width: 30px; height: 30px; }
    .timeline-dot-wrap { min-width: 40px; }
    .timeline-theme-label { display: none; }
    .timeline-dot-label { font-size: 0.56rem; }
    .timeline::before { top: 15px; }
  }
}

/* ── Intro Section ── */
@layer intro {
  .intro-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
    transition: background var(--duration-theme) var(--ease-out);
  }

  .intro-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 4rem;
    align-items: start;
  }

  @media (max-width: 760px) {
    .intro-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  }

  .section-heading {
    font-family: var(--font-sans);
    font-size: 1.7rem;
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    color: var(--text-primary);
  }

  .intro-note p { color: var(--text-secondary); }
  .intro-note p + p { margin-top: 0.75rem; }

  .principles-subtitle {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-style: italic;
  }

  .principles-grid { display: flex; flex-direction: column; gap: 0.75rem; }

  .principle-card {
    display: flex;
    gap: 0.875rem;
    align-items: flex-start;
    padding: 1rem 1.1rem;
    border-radius: var(--r-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    transition:
      background var(--duration-base) var(--ease-out),
      transform var(--duration-base) var(--ease-spring),
      box-shadow var(--duration-base) var(--ease-out);
  }

  .principle-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
  }

  .principle-icon {
    flex-shrink: 0;
    margin-top: 2px;
    display: flex;
    align-items: center;
    color: var(--text-muted);
  }
  .principle-icon svg { width: 1.25rem; height: 1.25rem; }

  .principle-card strong { font-size: 0.95rem; }
  .principle-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
    line-height: 1.55;
  }

  .badge {
    display: inline-flex;
    align-items: center;
    padding: 0.15em 0.55em;
    border-radius: var(--r-xs);
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    line-height: 1.5;
    vertical-align: middle;
  }

  .badge-body {
    background: var(--p4-bg);
    color: var(--p4);
    border: 1px solid var(--p4-light);
  }
}

/* ── Age Sections ── */
@layer age-sections {
  .age-section {
    border-bottom: 1px solid var(--border-light);
    position: relative;
    transition: background var(--duration-theme) var(--ease-out);
  }

  .age-section:nth-child(even) { background: var(--accent-bg); }

  .age-section-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .age-header {
    display: flex;
    align-items: baseline;
    gap: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--accent-bg);
    position: relative;
  }

  .age-header::before {
    content: '';
    position: absolute;
    left: -1.5rem;
    top: 0;
    bottom: -2px;
    width: 4px;
    background: var(--accent);
    border-radius: 0 var(--r-xs) var(--r-xs) 0;
    transition: width var(--duration-base) var(--ease-spring);
  }

  .age-section:hover .age-header::before { width: 6px; }

  .age-number {
    font-family: var(--font-sans);
    font-size: clamp(2.6rem, 6.5vw, 4.75rem);
    font-weight: 600;
    line-height: 0.9;
    color: var(--accent);
    letter-spacing: -0.04em;
    flex-shrink: 0;
    transition: color var(--duration-theme) var(--ease-out);
  }

  .age-meta { flex: 1; }

  .age-title {
    font-family: var(--font-sans);
    font-size: clamp(1.3rem, 3vw, 1.75rem);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 0.35rem;
  }

  .age-intro {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.5;
  }

  .lesson-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.7rem;
  }

  @media (max-width: 640px) { .lesson-list { grid-template-columns: 1fr; } }

  .lesson-list li {
    padding: 0.8rem 1rem 0.8rem 1.25rem;
    border-radius: var(--r-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--text-primary);
    position: relative;
    transition:
      background var(--duration-base) var(--ease-out),
      transform var(--duration-base) var(--ease-spring),
      box-shadow var(--duration-base) var(--ease-out),
      border-color var(--duration-base) var(--ease-out);
  }

  /* Bold label leads each lesson; the em-dash separator stays in the copy */
  .lesson-list li strong { color: var(--text-primary); font-weight: 600; }

  .lesson-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 56%;
    min-height: 20px;
    background: var(--accent-light);
    border-radius: 0 var(--r-xs) var(--r-xs) 0;
    transition:
      background var(--duration-base) var(--ease-out),
      height var(--duration-base) var(--ease-spring);
  }

  .lesson-list li:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
    border-color: var(--accent-light);
  }

  .lesson-list li:hover::before {
    background: var(--accent);
    height: 78%;
  }

  .lesson-list li .badge { margin-right: 0.4rem; }
}

/* ── Deeper Themes ── */
@layer themes {
  .themes-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
    transition: background var(--duration-theme) var(--ease-out);
  }

  .section-header { max-width: 640px; margin-bottom: 3.5rem; }

  .section-header .eyebrow { display: block; margin-bottom: 1rem; }

  .section-heading-large {
    font-family: var(--font-sans);
    font-size: clamp(2.1rem, 5vw, 3.25rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.05;
    color: var(--text-primary);
    margin-bottom: 0.9rem;
  }

  .section-subheading {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.65;
    max-width: 60ch;
  }

  /* Editorial rhythm on a 6-col grid, every row filled (no empty cells):
     row 1 = two wide cards, row 2 = three cards, row 3 = one full-width card. */
  .themes-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1.25rem;
  }

  .theme-card { grid-column: span 2; }
  .theme-card:nth-child(1),
  .theme-card:nth-child(2) { grid-column: span 3; }
  .theme-card:nth-child(6) { grid-column: span 6; }

  @media (max-width: 900px) {
    .themes-grid { grid-template-columns: repeat(2, 1fr); }
    .theme-card { grid-column: span 1 !important; }
  }
  @media (max-width: 560px) {
    .themes-grid { grid-template-columns: 1fr; }
    .theme-card { grid-column: span 1 !important; }
  }

  .theme-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--r-md);
    padding: 1.6rem;
    transition:
      transform var(--duration-base) var(--ease-spring),
      box-shadow var(--duration-base) var(--ease-out),
      border-color var(--duration-base) var(--ease-out),
      background var(--duration-theme) var(--ease-out);
  }

  .theme-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
  }

  .theme-icon {
    margin-bottom: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: var(--r-sm);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    transition: transform var(--duration-base) var(--ease-spring);
  }
  .theme-icon svg { width: 1.5rem; height: 1.5rem; }
  .theme-card:hover .theme-icon { transform: scale(1.08) rotate(-4deg); }

  .theme-card h3 {
    font-family: var(--font-sans);
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    margin-bottom: 0.6rem;
    line-height: 1.25;
  }

  .theme-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
  }
}

/* ── Closing Section ── */
@layer closing {
  .closing-section {
    background: var(--bg-primary);
    transition: background var(--duration-theme) var(--ease-out);
  }

  .closing-inner { text-align: center; margin-bottom: 3.5rem; }

  .closing-title {
    font-family: var(--font-sans);
    font-size: clamp(2.1rem, 5vw, 3.4rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.02;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
  }

  .closing-subtitle {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text-muted);
    font-size: 1.25rem;
    margin-bottom: 1.75rem;
  }

  .closing-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 60ch;
    margin: 0 auto;
    line-height: 1.75;
  }

  .values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.875rem;
    margin-bottom: 3rem;
  }

  @media (max-width: 580px) { .values-grid { grid-template-columns: 1fr; } }

  .value-item {
    display: flex;
    align-items: flex-start;
    gap: 0.875rem;
    padding: 1rem 1.1rem;
    border-radius: var(--r-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--text-secondary);
    transition:
      transform var(--duration-base) var(--ease-spring),
      box-shadow var(--duration-base) var(--ease-out),
      background var(--duration-theme) var(--ease-out);
  }
  .value-item strong { color: var(--text-primary); }
  .value-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }

  .value-dot {
    width: 9px;
    height: 9px;
    border-radius: var(--r-pill);
    background: linear-gradient(135deg, var(--p1-mid), var(--p5-mid));
    flex-shrink: 0;
    margin-top: 7px;
  }

  .closing-quote {
    text-align: center;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(1.2rem, 2.6vw, 1.55rem);
    color: var(--text-secondary);
    max-width: 40rem;
    margin: 0 auto;
    padding: 2.25rem 2rem;
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
    line-height: 1.55;
    position: relative;
  }

  .closing-quote::before {
    content: '\201C';
    position: absolute;
    top: 0.5rem;
    left: 1rem;
    font-size: 4rem;
    color: var(--border-subtle);
    font-family: var(--font-serif);
    line-height: 1;
  }
}

/* ── Footer ── */
@layer footer {
  .site-footer {
    padding: 2.5rem 0;
    text-align: center;
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
    transition: background var(--duration-theme) var(--ease-out);
  }

  .site-footer p {
    font-size: 0.82rem;
    color: var(--text-muted);
  }
}