:root,
[data-theme="light"] {
  --text-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.875rem);
  --text-sm: clamp(0.9rem, 0.85rem + 0.2vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.1rem);
  --text-lg: clamp(1.2rem, 1rem + 0.8vw, 1.55rem);
  --text-xl: clamp(1.7rem, 1.1rem + 2vw, 2.9rem);
  --text-2xl: clamp(2.4rem, 1.3rem + 4vw, 5.2rem);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.9rem;
  --radius-lg: 1.4rem;
  --radius-xl: 1.8rem;
  --radius-full: 999px;
  --color-bg: #f4efe8;
  --color-surface: #fcfaf7;
  --color-surface-2: #f6f1ea;
  --color-surface-3: #eee5d9;
  --color-border: rgba(43, 36, 27, 0.12);
  --color-divider: rgba(43, 36, 27, 0.08);
  --color-text: #221c14;
  --color-text-muted: #6c665f;
  --color-text-soft: #8d857d;
  --color-primary: #8b5e34;
  --color-primary-strong: #6f4925;
  --color-primary-soft: rgba(139, 94, 52, 0.12);
  --color-accent: #1f5c5a;
  --color-accent-soft: rgba(31, 92, 90, 0.14);
  --shadow-sm: 0 6px 18px rgba(39, 26, 16, 0.08);
  --shadow-md: 0 16px 40px rgba(39, 26, 16, 0.12);
  --shadow-lg: 0 28px 70px rgba(39, 26, 16, 0.18);
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Manrope', 'Segoe UI', sans-serif;
  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --content: 1200px;
}

[data-theme="dark"] {
  --color-bg: #17120e;
  --color-surface: #211a15;
  --color-surface-2: #2a211b;
  --color-surface-3: #332922;
  --color-border: rgba(243, 232, 219, 0.12);
  --color-divider: rgba(243, 232, 219, 0.08);
  --color-text: #f2e8dc;
  --color-text-muted: #c4b6a7;
  --color-text-soft: #9f9183;
  --color-primary: #d8aa77;
  --color-primary-strong: #f0c08b;
  --color-primary-soft: rgba(216, 170, 119, 0.14);
  --color-accent: #7cc0ba;
  --color-accent-soft: rgba(124, 192, 186, 0.12);
  --shadow-sm: 0 6px 18px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 16px 40px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 28px 70px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #17120e;
    --color-surface: #211a15;
    --color-surface-2: #2a211b;
    --color-surface-3: #332922;
    --color-border: rgba(243, 232, 219, 0.12);
    --color-divider: rgba(243, 232, 219, 0.08);
    --color-text: #f2e8dc;
    --color-text-muted: #c4b6a7;
    --color-text-soft: #9f9183;
    --color-primary: #d8aa77;
    --color-primary-strong: #f0c08b;
    --color-primary-soft: rgba(216, 170, 119, 0.14);
    --color-accent: #7cc0ba;
    --color-accent-soft: rgba(124, 192, 186, 0.12);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, rgba(139, 94, 52, 0.08), transparent 32%),
    radial-gradient(circle at right 20% top 10%, rgba(31, 92, 90, 0.08), transparent 24%),
    var(--color-bg);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}
.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -4rem;
  background: var(--color-text);
  color: var(--color-surface);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  z-index: 100;
}
.skip-link:focus { top: var(--space-4); }
.container {
  width: min(calc(100% - 2rem), var(--content));
  margin-inline: auto;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--color-bg) 84%, transparent);
  border-bottom: 1px solid var(--color-divider);
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  min-height: 5rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 800;
}
.brand span {
  display: grid;
  gap: 0.1rem;
}
.brand small {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.brand-mark {
  width: 2.8rem;
  color: var(--color-primary);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.main-nav a,
.theme-toggle {
  min-height: 44px;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  transition: var(--transition);
}
.main-nav a:hover,
.main-nav a:focus-visible,
.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: var(--color-surface);
  border-color: var(--color-border);
}
.theme-toggle {
  width: 44px;
  display: inline-grid;
  place-items: center;
  color: var(--color-text);
  background: transparent;
  cursor: pointer;
}
.hero {
  padding: clamp(var(--space-12), 10vw, var(--space-24)) 0 var(--space-10);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
  gap: var(--space-8);
  align-items: stretch;
}
.hero-grid-epoch {
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
}
.hero-copy h1 {
  margin: 0 0 var(--space-5);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-2xl);
  line-height: 0.95;
  letter-spacing: -0.03em;
  max-width: 12ch;
}
.hero-copy .lead {
  max-width: 60ch;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}
.eyebrow {
  margin: 0 0 var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 800;
}
.hero-actions,
.footer-row,
.mini-nav,
.section-heading,
.info-grid,
.motifs-layout,
.split-layout { gap: var(--space-4); }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.9rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 800;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
}
.btn:hover,
.btn:focus-visible { transform: translateY(-2px); }
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover,
.btn-primary:focus-visible { background: var(--color-primary-strong); }
.btn-secondary {
  background: var(--color-surface);
}
.hero-panel,
.content-card,
.epoch-card,
.reading-card,
.context-card,
.concept-card,
.info-card {
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}
.hero-panel {
  padding: var(--space-6);
  display: grid;
  gap: var(--space-4);
  position: relative;
  overflow: hidden;
}
.hero-panel::after {
  content: "";
  position: absolute;
  inset: auto -10% -30% auto;
  width: 12rem;
  height: 12rem;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-primary-soft), transparent 70%);
}
.stat-card,
.timeline-item {
  position: relative;
  z-index: 1;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}
.stat-card span,
.timeline-item span,
.reading-type {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-soft);
  font-weight: 800;
}
.stat-card strong,
.timeline-item strong { font-size: var(--text-lg); }
.section {
  padding: clamp(var(--space-10), 8vw, var(--space-20)) 0;
}
.section-soft {
  background: color-mix(in srgb, var(--color-surface-2) 76%, transparent);
  border-block: 1px solid var(--color-divider);
}
.section-heading {
  display: grid;
  margin-bottom: var(--space-8);
}
.section-heading h2,
.info-card h2,
.content-card h2,
.motifs-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  line-height: 1;
}
.section-heading p:last-child,
.content-card p,
.info-card p,
.reading-card p,
.context-card p,
.concept-card p,
.epoch-card p {
  color: var(--color-text-muted);
}
.epochs-grid,
.concept-grid,
.context-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}
.epoch-card,
.concept-card,
.context-card {
  padding: var(--space-5);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.epoch-card:hover,
.concept-card:hover,
.context-card:hover,
.reading-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--color-border));
}
.epoch-card { grid-column: span 4; }
.concept-card { grid-column: span 3; }
.context-card { grid-column: span 4; }
.epoch-card-active {
  background: linear-gradient(180deg, var(--color-surface), var(--color-surface-2));
  border-color: color-mix(in srgb, var(--color-primary) 36%, var(--color-border));
}
.epoch-status {
  display: inline-flex;
  margin-bottom: var(--space-4);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 800;
  background: var(--color-primary-soft);
  color: var(--color-primary);
}
.info-grid,
.motifs-layout,
.split-layout,
.next-epochs-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.info-card,
.content-card,
.next-epochs-panel { padding: var(--space-6); }
.accent-card {
  background: linear-gradient(180deg, color-mix(in srgb, var(--color-accent-soft) 80%, var(--color-surface)), var(--color-surface));
}
.check-list,
.strategy-list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0;
  display: grid;
  gap: var(--space-3);
}
.check-list li,
.strategy-list li {
  position: relative;
  padding-left: 1.5rem;
}
.check-list li::before,
.strategy-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--color-accent);
}
.reading-list {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}
.reading-card {
  grid-column: span 6;
  padding: var(--space-5);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  transition: transform var(--transition), border-color var(--transition);
}
.featured-reading {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(260px, 0.95fr);
  gap: var(--space-5);
  background: linear-gradient(140deg, color-mix(in srgb, var(--color-primary-soft) 75%, var(--color-surface)), var(--color-surface));
}
.featured-reading ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--color-text-muted);
}
.motif-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}
.motif-tags span,
.mini-nav a {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}
.next-epochs-panel {
  align-items: center;
  gap: var(--space-8);
}
.mini-nav {
  display: flex;
  flex-wrap: wrap;
}
.site-footer {
  padding: var(--space-6) 0 var(--space-10);
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}
.footer-row p,
.footer-row a { color: var(--color-text-muted); }
code {
  padding: 0.15rem 0.4rem;
  border-radius: 0.4rem;
  background: var(--color-surface-3);
}

@media (max-width: 1050px) {
  .hero-grid,
  .hero-grid-epoch,
  .info-grid,
  .motifs-layout,
  .split-layout,
  .next-epochs-panel,
  .featured-reading {
    grid-template-columns: 1fr;
  }
  .epoch-card,
  .concept-card,
  .context-card,
  .reading-card { grid-column: span 6; }
}

@media (max-width: 760px) {
  .topbar {
    padding: var(--space-3) 0;
    align-items: flex-start;
    flex-direction: column;
  }
  .main-nav { width: 100%; }
  .main-nav a {
    flex: 1 1 auto;
    text-align: center;
  }
  .hero-copy h1 { max-width: 100%; }
  .epoch-card,
  .concept-card,
  .context-card,
  .reading-card { grid-column: 1 / -1; }
  .container { width: min(calc(100% - 1.25rem), var(--content)); }
  .section-heading { margin-bottom: var(--space-6); }
  .footer-row { align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}


.sinusoida-chart-card {
  padding: var(--space-6);
  overflow: hidden;
}

.sinusoida-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  margin-bottom: var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.sinusoida-legend span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.legend-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: var(--radius-full);
  display: inline-block;
}

.legend-top { background: var(--color-primary); }
.legend-bottom { background: var(--color-orange); }

.sinusoida-chart {
  padding: var(--space-4);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top left, color-mix(in oklab, var(--color-primary) 12%, transparent), transparent 34%),
    linear-gradient(180deg, color-mix(in oklab, var(--color-surface-2) 92%, var(--color-primary) 8%), var(--color-surface));
  border: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
}

.sinusoida-svg {
  width: 100%;
  height: auto;
  max-width: 1180px;
  margin-inline: auto;
}

.axis-line {
  stroke: color-mix(in oklab, var(--color-text) 24%, transparent);
  stroke-width: 2;
  stroke-dasharray: 10 10;
}

.wave-glow {
  fill: none;
  stroke: color-mix(in oklab, var(--color-primary) 28%, transparent);
  stroke-width: 22;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.wave-line-solid {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.epoch-point circle {
  stroke: var(--color-bg);
  stroke-width: 4;
}

.epoch-point text {
  fill: var(--color-text);
  font-family: var(--font-body, sans-serif);
  font-size: 1rem;
  font-weight: 700;
  text-anchor: middle;
}

.top-point circle { fill: var(--color-primary); }
.bottom-point circle { fill: var(--color-orange); }

.epoch-strip rect {
  stroke-width: 1;
}

.top-strip rect {
  fill: color-mix(in oklab, var(--color-primary) 12%, var(--color-surface-2));
  stroke: color-mix(in oklab, var(--color-primary) 30%, transparent);
}

.bottom-strip rect {
  fill: color-mix(in oklab, var(--color-orange) 12%, var(--color-surface-2));
  stroke: color-mix(in oklab, var(--color-orange) 34%, transparent);
}

.epoch-strip text {
  fill: var(--color-text);
  font-family: var(--font-body, sans-serif);
  font-size: 0.95rem;
  font-weight: 700;
  text-anchor: middle;
}

@media (max-width: 900px) {
  .sinusoida-chart-card { padding: var(--space-4); }
  .sinusoida-chart { padding: var(--space-2); overflow-x: auto; }
  .sinusoida-svg { min-width: 900px; }
}


.nav-toggle {
  display: none;
  width: 3rem;
  height: 3rem;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.3rem;
  border-radius: var(--radius-full);
  border: 1px solid color-mix(in oklab, var(--color-text) 12%, transparent);
  background: color-mix(in oklab, var(--color-surface) 88%, transparent);
  box-shadow: var(--shadow-sm);
}

.nav-toggle span {
  width: 1.1rem;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(4) {
  transform: translateY(-8px) rotate(-45deg);
}

.epoch-strip text {
  font-size: 0.9rem;
  font-weight: 700;
}

.epoch-strip tspan {
  dominant-baseline: middle;
}

@media (max-width: 900px) {
  .topbar {
    position: relative;
    align-items: center;
    gap: var(--space-3);
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .main-nav[data-collapsible-nav] {
    position: absolute;
    top: calc(100% + var(--space-3));
    left: var(--space-4);
    right: var(--space-4);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-3);
    border-radius: var(--radius-xl);
    background: color-mix(in oklab, var(--color-surface) 96%, transparent);
    border: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(12px);
    z-index: 30;
  }

  .main-nav[data-collapsible-nav].is-open {
    display: flex;
  }

  .main-nav[data-collapsible-nav] a,
  .main-nav[data-collapsible-nav] .theme-toggle {
    width: 100%;
    min-height: 44px;
  }

  .main-nav[data-collapsible-nav] .theme-toggle {
    justify-content: center;
  }

  .sinusoida-chart-card {
    padding: var(--space-3);
  }

  .sinusoida-legend {
    flex-direction: column;
    gap: var(--space-2);
  }

  .sinusoida-chart {
    padding: var(--space-2);
    overflow-x: auto;
  }

  .sinusoida-svg {
    min-width: 1100px;
  }

  .epoch-strip text {
    font-size: 0.88rem;
  }
}


/* Global collapsible nav */
.nav-toggle {
  display: none;
  width: 3rem;
  height: 3rem;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.3rem;
  border-radius: var(--radius-full);
  border: 1px solid color-mix(in oklab, var(--color-text) 12%, transparent);
  background: color-mix(in oklab, var(--color-surface) 92%, transparent);
  box-shadow: var(--shadow-sm);
}

.nav-toggle span {
  width: 1.1rem;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(4) { transform: translateY(-8px) rotate(-45deg); }

/* Sinusoida: never clip the drawing */
.sinusoida-chart-card {
  overflow: visible;
}

.sinusoida-chart {
  overflow-x: auto;
  overflow-y: visible;
  -webkit-overflow-scrolling: touch;
}

.sinusoida-svg {
  display: block;
  width: 1200px;
  max-width: none;
  min-width: 1200px;
  height: auto;
  margin-inline: auto;
}

.epoch-strip text {
  font-size: 0.9rem;
  font-weight: 700;
}

.epoch-strip tspan { dominant-baseline: middle; }

@media (max-width: 900px) {
  .topbar {
    position: relative;
    align-items: center;
    gap: var(--space-3);
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .main-nav[data-collapsible-nav] {
    position: absolute;
    top: calc(100% + var(--space-3));
    left: var(--space-4);
    right: var(--space-4);
    display: none !important;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-3);
    border-radius: var(--radius-xl);
    background: color-mix(in oklab, var(--color-surface) 96%, transparent);
    border: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(12px);
    z-index: 40;
    width: auto;
  }

  .main-nav[data-collapsible-nav].is-open {
    display: flex !important;
  }

  .main-nav[data-collapsible-nav] a,
  .main-nav[data-collapsible-nav] .theme-toggle {
    width: 100%;
    min-height: 44px;
  }

  .main-nav[data-collapsible-nav] .theme-toggle {
    justify-content: center;
  }

  .sinusoida-chart-card { padding: var(--space-3); }
  .sinusoida-legend { flex-direction: column; gap: var(--space-2); }
  .sinusoida-chart { padding: var(--space-2); }
  .sinusoida-svg { width: 1200px; min-width: 1200px; }
}


.mixed-point circle { fill: var(--color-gold); stroke: var(--color-bg); stroke-width: 4; }

.sinusoida-chart-card { overflow: visible; }
.sinusoida-chart {
  overflow-x: auto;
  overflow-y: visible;
  -webkit-overflow-scrolling: touch;
}
.sinusoida-svg {
  display: block;
  width: 1200px;
  min-width: 1200px;
  max-width: none;
  height: auto;
  margin-inline: auto;
}
.epoch-point text {
  paint-order: stroke;
  stroke: var(--color-bg);
  stroke-width: 6px;
  stroke-linejoin: round;
}
@media (max-width: 900px) {
  .sinusoida-chart-card { padding: var(--space-3); overflow: visible; }
  .sinusoida-chart { padding: var(--space-2); overflow-x: auto; overflow-y: visible; }
  .sinusoida-svg { width: 1200px; min-width: 1200px; }
}


/* Hamburger fix: hide assistive label visually and draw only 3 bars */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 3rem;
  height: 3rem;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.32rem;
  border: 1px solid color-mix(in oklab, var(--color-text) 12%, transparent);
  border-radius: var(--radius-full);
  background: color-mix(in oklab, var(--color-surface) 94%, transparent);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  appearance: none;
  -webkit-appearance: none;
}

.nav-toggle > span:not(.sr-only) {
  display: block;
  width: 1.15rem;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform var(--transition), opacity var(--transition), background var(--transition);
}

.nav-toggle[aria-expanded="true"] > span:nth-child(2) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] > span:nth-child(3) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] > span:nth-child(4) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 900px) {
  .topbar {
    position: relative;
    align-items: center;
    gap: var(--space-3);
  }

  .nav-toggle {
    display: inline-flex !important;
    margin-left: auto;
    flex: 0 0 auto;
  }

  .main-nav[data-collapsible-nav] {
    position: absolute;
    top: calc(100% + var(--space-3));
    left: var(--space-4);
    right: var(--space-4);
    display: none !important;
    flex-direction: column !important;
    align-items: stretch !important;
    gap: var(--space-2);
    padding: var(--space-3);
    width: auto !important;
    border-radius: var(--radius-xl);
    background: color-mix(in oklab, var(--color-surface) 96%, transparent);
    border: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(12px);
    z-index: 50;
  }

  .main-nav[data-collapsible-nav].is-open {
    display: flex !important;
  }

  .main-nav[data-collapsible-nav] a,
  .main-nav[data-collapsible-nav] .theme-toggle {
    width: 100%;
    min-height: 44px;
    justify-content: flex-start;
  }
}


/* FINAL MOBILE NAV OVERRIDE */
.nav-toggle {
  display: none;
  position: relative;
  width: 3rem !important;
  height: 3rem !important;
  min-width: 3rem;
  min-height: 3rem;
  padding: 0 !important;
  border: 1px solid color-mix(in oklab, var(--color-text) 12%, transparent) !important;
  border-radius: var(--radius-full) !important;
  background: color-mix(in oklab, var(--color-surface) 94%, transparent) !important;
  color: var(--color-text) !important;
  box-shadow: var(--shadow-sm) !important;
  appearance: none;
  -webkit-appearance: none;
  flex: 0 0 auto;
}

.nav-toggle::before,
.nav-toggle::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transform: translateX(-50%);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle::before {
  top: 1.08rem;
  box-shadow: 0 6px 0 0 currentColor;
}

.nav-toggle::after {
  top: 1.46rem;
}

.nav-toggle[aria-expanded="true"]::before {
  top: 1.42rem;
  transform: translateX(-50%) rotate(45deg);
  box-shadow: none;
}

.nav-toggle[aria-expanded="true"]::after {
  top: 1.42rem;
  transform: translateX(-50%) rotate(-45deg);
}

@media (max-width: 900px) {
  .topbar {
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: var(--space-3) !important;
    position: relative !important;
    padding: var(--space-3) 0 !important;
  }

  .brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .nav-toggle {
    display: inline-flex !important;
  }

  .main-nav[data-collapsible-nav] {
    position: absolute !important;
    top: calc(100% + var(--space-3)) !important;
    left: var(--space-4) !important;
    right: var(--space-4) !important;
    width: auto !important;
    display: none !important;
    flex-direction: column !important;
    align-items: stretch !important;
    gap: var(--space-2) !important;
    padding: var(--space-3) !important;
    border-radius: var(--radius-xl) !important;
    background: color-mix(in oklab, var(--color-surface) 96%, transparent) !important;
    border: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent) !important;
    box-shadow: var(--shadow-lg) !important;
    backdrop-filter: blur(12px);
    z-index: 80 !important;
  }

  .main-nav[data-collapsible-nav].is-open {
    display: flex !important;
  }

  .main-nav[data-collapsible-nav] a,
  .main-nav[data-collapsible-nav] .theme-toggle {
    width: 100% !important;
    min-height: 44px !important;
    justify-content: flex-start !important;
    text-align: left !important;
  }

  .main-nav:not([data-collapsible-nav]) {
    width: auto;
  }
}





/* FINAL MOBILE NAV FIX v3 */
.nav-toggle {
  display: none;
  position: relative;
  width: 48px !important;
  height: 48px !important;
  min-width: 48px !important;
  min-height: 48px !important;
  padding: 0 !important;
  border: 1px solid var(--color-border) !important;
  border-radius: 14px !important;
  background: var(--color-surface) !important;
  color: var(--color-text) !important;
  box-shadow: var(--shadow-sm) !important;
  appearance: none;
  -webkit-appearance: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  overflow: hidden;
}

.nav-toggle .bar {
  display: block !important;
  width: 18px !important;
  height: 2px !important;
  border-radius: 999px !important;
  background: currentColor !important;
  flex: 0 0 auto;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle::before,
.nav-toggle::after {
  content: none !important;
}

.nav-toggle[aria-expanded="true"] .bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 900px) {
  .topbar {
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: var(--space-3) !important;
    position: relative !important;
    padding: var(--space-3) 0 !important;
  }

  .brand { flex: 1 1 auto; min-width: 0; }

  .nav-toggle {
    display: inline-flex !important;
    margin-left: auto;
  }

  .main-nav,
  .main-nav[data-collapsible-nav] {
    display: none !important;
    position: absolute !important;
    top: calc(100% + var(--space-3)) !important;
    left: var(--space-4) !important;
    right: var(--space-4) !important;
    width: auto !important;
    flex-direction: column !important;
    align-items: stretch !important;
    gap: var(--space-2) !important;
    padding: var(--space-3) !important;
    border-radius: var(--radius-xl) !important;
    background: var(--color-surface) !important;
    border: 1px solid var(--color-border) !important;
    box-shadow: var(--shadow-lg) !important;
    z-index: 90 !important;
  }

  .main-nav.is-open,
  .main-nav[data-collapsible-nav].is-open {
    display: flex !important;
  }

  .main-nav a,
  .main-nav .theme-toggle {
    width: 100% !important;
    min-height: 44px !important;
    justify-content: flex-start !important;
    text-align: left !important;
  }
}


/* FINAL SINUSOIDA RESPONSIVE TUNING */
.sinusoida-chart-card {
  overflow: visible !important;
}

.sinusoida-chart {
  width: 100%;
  overflow: hidden;
}

.sinusoida-svg {
  display: block;
  width: 100% !important;
  min-width: 0 !important;
  max-width: 100% !important;
  height: auto;
  margin-inline: auto;
}

@media (max-width: 900px) {
  .sinusoida-chart {
    overflow-x: auto !important;
    overflow-y: visible !important;
    -webkit-overflow-scrolling: touch;
  }

  .sinusoida-svg {
    width: 1200px !important;
    min-width: 1200px !important;
    max-width: none !important;
  }
}


/* FINAL SINUSOIDA LABEL CLEANUP */
.epoch-strip {
  display: none !important;
}