/*
 * Lotus Home Academy — design baseline (internal strategy brief + Apple clarity / deference / depth)
 * Primary: Apple HIG https://developer.apple.com/design/human-interface-guidelines/
 * Materials (layering, legibility, vibrancy): https://developer.apple.com/design/Human-Interface-Guidelines/materials
 * Inclusion (accessibility, adaptability, respectful experience):
 * https://developer.apple.com/design/human-interface-guidelines/inclusion
 * Apple Design hub: https://developer.apple.com/design/
 * Page structure & hierarchy: https://blog.tubikstudio.com/anatomy-of-web-page/
 * Apple-on-web patterns: https://smashed-avo.com/5-apple-web-design-principles-that-can-transform-your-business-website/
 *   and https://durrickdesigns.com/learning-from-the-best-what-makes-apple-com-an-example-of-excellent-web-design/
 * General web craft: https://designmodo.com/website-design/ · https://medium.com/design-bootcamp/design-principles-used-by-apple-for-better-user-experience-592574194bfb
 * Glass / materials: Apple Liquid Glass (concept + accessibility notes)
 * https://developer.apple.com/documentation/technologyoverviews/adopting-liquid-glass
 * Web uses backdrop-filter + translucent gradients (not identical to native SDK materials).
 * Tahoe Figma reference: https://www.figma.com/community/file/1543337041090580818/macos-26
 */
:root {
  color-scheme: light dark;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", "Segoe UI", system-ui, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "Segoe UI", system-ui, sans-serif;

  /* System blues — HIG standard tint for links & primary actions (light) */
  --apple-blue: #007aff;
  --apple-blue-pressed: #0056b3;
  /* Semantic labels & surfaces (light, iOS-style grouped) */
  --label-primary: #000000;
  --label-secondary: rgba(60, 60, 67, 0.6);
  --label-tertiary: rgba(60, 60, 67, 0.3);
  --separator: rgba(60, 60, 67, 0.29);
  --fill-tertiary: rgba(120, 120, 128, 0.12);
  --fill-quaternary: rgba(120, 120, 128, 0.08);
  --bg-grouped-primary: #ffffff;
  --bg-grouped-secondary: #f2f2f7;

  --color-ink: var(--label-primary);
  --color-ink-muted: var(--label-secondary);
  --color-accent: var(--apple-blue);
  --color-accent-hover: var(--apple-blue-pressed);
  --color-sky: #5ac8fa;
  --color-sun: #ffcc00;
  --color-leaf: #34c759;
  /* Quiet brand accent (Lotus / learning — use sparingly; links stay system blue) */
  --accent-brand: #1f9b8c;
  --accent-brand-muted: rgba(31, 155, 140, 0.12);
  --color-chalkboard: var(--label-primary);
  --color-border: var(--fill-tertiary);
  --color-separator: var(--separator);
  --color-accent-soft: rgba(0, 122, 255, 0.1);

  --color-bg: var(--bg-grouped-secondary);
  --color-surface: var(--bg-grouped-primary);
  --color-paper: var(--bg-grouped-primary);

  --glass-panel-bg: rgba(255, 255, 255, 0.72);
  --glass-panel-border: rgba(255, 255, 255, 0.55);
  --glass-panel-highlight: rgba(255, 255, 255, 0.55);

  /* Liquid Glass–style (web): fluid translucency + strong blur/saturation — use sparingly on chrome */
  --liquid-blur: blur(56px) saturate(210%);
  --liquid-blur-chrome: blur(44px) saturate(200%);
  --liquid-blur-soft: blur(28px) saturate(185%);
  --glass-surface-top: rgba(255, 255, 255, 0.95);
  --glass-surface-mid: rgba(255, 255, 255, 0.62);
  --glass-surface-bottom: rgba(255, 255, 255, 0.4);
  --glass-edge-specular: rgba(255, 255, 255, 0.86);
  --glass-edge-hairline: rgba(255, 255, 255, 0.56);

  --material-blur: var(--liquid-blur-soft);
  --material-blur-strong: var(--liquid-blur-chrome);
  --focus-ring-color: var(--apple-blue);

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4.5rem;
  --space-2xl: 6rem;
  --prose-measure: 65ch;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 22px;
  --radius-tape: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-material: 0 4px 24px rgba(0, 0, 0, 0.06), 0 0 0 0.5px rgba(0, 0, 0, 0.04) inset;
  --shadow-warm: var(--shadow-material);
  --max: 72rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.47059;
  letter-spacing: -0.022em;
  color: var(--label-primary);
  background-color: var(--bg-grouped-secondary);
  /* Soft marketing-style light orbs (Apple.com–like), not heavy texture */
  background-image:
    radial-gradient(120% 70% at 88% -15%, rgba(0, 122, 255, 0.08), transparent 52%),
    radial-gradient(80% 55% at -5% 45%, rgba(90, 200, 250, 0.06), transparent 48%),
    radial-gradient(60% 45% at 50% 105%, rgba(0, 122, 255, 0.04), transparent 50%);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--apple-blue);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--apple-blue-pressed);
}

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 100;
  padding: var(--space-sm);
  background: var(--color-chalkboard);
  color: #fff;
}

.skip-link:focus {
  left: var(--space-sm);
  top: var(--space-sm);
}

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header — Liquid Glass–style chrome (translucent stack + backdrop; content stays legible) */
.site-header {
  background: linear-gradient(
    180deg,
    var(--glass-surface-top) 0%,
    var(--glass-surface-mid) 42%,
    var(--glass-surface-bottom) 100%
  );
  backdrop-filter: var(--liquid-blur-chrome);
  -webkit-backdrop-filter: var(--liquid-blur-chrome);
  border-bottom: 1px solid var(--glass-edge-hairline);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow:
    0 1px 0 var(--glass-edge-specular) inset,
    0 24px 68px rgba(0, 0, 0, 0.12);
}

.site-header--home {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.88) 0%,
    rgba(255, 255, 255, 0.48) 100%
  );
  border-bottom-color: var(--glass-edge-hairline);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-sm);
  flex-wrap: wrap;
}

.site-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.2rem;
  min-width: 0;
}

.site-brand--home {
  align-items: center;
  text-align: center;
}

@media (min-width: 640px) {
  .site-brand--home {
    align-items: flex-start;
    text-align: left;
  }
}

.site-tagline {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--label-secondary);
  letter-spacing: -0.01em;
  max-width: 36ch;
}

.site-header__inner--home {
  justify-content: center;
}

@media (min-width: 861px) {
  .site-header__inner--home {
    justify-content: flex-start;
  }
}

/* Breadcrumb — secondary glass layer under header */
.breadcrumb-bar {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.78) 0%,
    rgba(255, 255, 255, 0.5) 100%
  );
  backdrop-filter: var(--liquid-blur-soft);
  -webkit-backdrop-filter: var(--liquid-blur-soft);
  border-bottom: 1px solid var(--glass-edge-hairline);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.62) inset,
    0 8px 20px rgba(0, 0, 0, 0.06);
}

.breadcrumb {
  padding: var(--space-xs) 0;
  font-size: 0.8125rem;
  color: var(--label-secondary);
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: var(--label-tertiary);
  font-weight: 500;
  pointer-events: none;
}

.breadcrumb a {
  color: var(--label-secondary);
  text-decoration: none;
  font-weight: 500;
}

.breadcrumb a:hover {
  color: var(--apple-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.breadcrumb [aria-current="page"] {
  color: var(--label-primary);
  font-weight: 600;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--label-primary);
  text-decoration: none;
  letter-spacing: -0.022em;
}

.logo:hover {
  color: var(--apple-blue);
}

.logo span {
  display: block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--label-secondary);
  margin-top: 0.15rem;
}

.nav-toggle {
  display: none;
  border: 0.5px solid var(--glass-edge-hairline);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.56));
  backdrop-filter: var(--liquid-blur-soft);
  -webkit-backdrop-filter: var(--liquid-blur-soft);
  padding: 0.55rem 0.95rem;
  border-radius: 12px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.7) inset,
    0 10px 24px rgba(0, 0, 0, 0.08);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--apple-blue);
  box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.25);
}

.nav-primary ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  align-items: center;
}

.nav-primary a {
  color: var(--label-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
}

.nav-primary a:hover,
.nav-primary a[aria-current="page"] {
  color: var(--apple-blue);
}

/* Contact in nav: same weight as other links (informational site — deference over funnel CTA) */
.nav-primary a.nav-contact {
  color: var(--apple-blue);
  font-weight: 600;
}

.nav-primary a.nav-contact:hover,
.nav-primary a.nav-contact[aria-current="page"] {
  color: var(--apple-blue-pressed);
}

@media (max-width: 860px) {
  .nav-toggle {
    display: block;
  }

  .nav-primary {
    width: 100%;
    display: none;
    padding-bottom: var(--space-sm);
  }

  .nav-primary.is-open {
    display: block;
  }

  .nav-primary ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-primary li {
    border-top: 1px solid var(--color-border);
  }

  .nav-primary a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 0.75rem 0;
  }

}

/* Home welcome */
.home-welcome {
  padding: var(--space-2xl) 0 var(--space-lg);
  text-align: center;
}

@media (min-width: 640px) {
  .home-welcome {
    text-align: left;
  }
}

.home-welcome__kicker {
  margin: 0 0 var(--space-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-brand);
}

.home-welcome h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.125rem, 5.5vw, 2.75rem);
  line-height: 1.08;
  margin: 0 0 var(--space-md);
  color: var(--label-primary);
  letter-spacing: -0.025em;
}

.home-welcome .home-welcome__lede {
  font-size: 1.125rem;
  line-height: 1.5;
  color: var(--label-secondary);
  max-width: 52ch;
  margin: 0 auto var(--space-xs);
}

@media (min-width: 640px) {
  .home-welcome .home-welcome__lede {
    margin-left: 0;
  }
}

.home-welcome .home-welcome__hint {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--label-secondary);
}

/* Classroom SVG */
.classroom-section {
  padding: var(--space-md) 0 var(--space-xl);
}

.classroom-frame {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--space-sm);
  border: 3px solid var(--color-border);
  box-shadow: var(--shadow-warm);
  max-width: 1000px;
  margin-inline: auto;
}

.classroom-svg {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius) - 4px);
}

.classroom-hotspot {
  cursor: pointer;
  outline: none;
}

.classroom-hotspot rect,
.classroom-hotspot circle {
  fill: transparent;
  stroke: transparent;
  stroke-width: 4;
  transition: fill 0.15s ease, stroke 0.15s ease;
}

.classroom-hotspot rect {
  rx: 8;
}

.classroom-hotspot:hover rect,
.classroom-hotspot:focus-visible rect,
.classroom-hotspot:hover circle,
.classroom-hotspot:focus-visible circle {
  fill: rgba(232, 184, 74, 0.22);
  stroke: var(--color-accent);
}

.classroom-hotspot:focus {
  outline: none;
}

.classroom-hotspot:focus-visible {
  outline: 3px solid var(--color-sky);
  outline-offset: 2px;
  border-radius: 10px;
}

/* Legacy hero (if any page still uses) */
.hero {
  padding: var(--space-xl) 0 var(--space-lg);
  background: linear-gradient(165deg, var(--color-accent-soft) 0%, var(--color-bg) 55%);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 2.125rem);
  line-height: 1.2;
  letter-spacing: 0.011em;
  margin: 0 0 var(--space-md);
  max-width: 20ch;
  color: var(--label-primary);
}

.hero__lede {
  font-size: 1.0625rem;
  color: var(--label-secondary);
  max-width: 42ch;
  margin: 0 0 var(--space-lg);
  line-height: 1.47;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.35rem;
  min-height: 44px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1.0625rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: -0.022em;
}

.btn--primary {
  background: var(--apple-blue);
  color: #fff;
}

.btn--primary:hover {
  background: var(--apple-blue-pressed);
  color: #fff;
}

.btn--ghost {
  background: var(--fill-quaternary);
  color: var(--apple-blue);
  border: 1px solid transparent;
}

.btn--ghost:hover {
  background: var(--fill-tertiary);
  color: var(--apple-blue-pressed);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.audience-card {
  background: var(--bg-grouped-secondary);
  border: 0.5px solid var(--separator);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: none;
}

.audience-card h2 {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
  color: var(--label-primary);
}

.audience-card p {
  margin: 0 0 var(--space-sm);
  color: var(--label-secondary);
  font-size: 0.9375rem;
  line-height: 1.47;
}

.audience-card a {
  font-weight: 600;
  font-size: 1rem;
}

section {
  padding: var(--space-2xl) 0;
}

section:nth-child(even) {
  background: var(--bg-grouped-primary);
  border-top: 0.5px solid var(--separator);
  border-bottom: 0.5px solid var(--separator);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  margin: 0 0 var(--space-md);
  letter-spacing: -0.025em;
  color: var(--label-primary);
}

.section-lede {
  color: var(--label-secondary);
  font-size: 1.125rem;
  line-height: 1.5;
  max-width: 58ch;
  margin: 0 0 var(--space-xl);
}

.pillars {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .pillars {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .pillars {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pillar {
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--radius-xl);
  border: 0.5px solid var(--separator);
  background: var(--bg-grouped-primary);
  box-shadow: var(--shadow-material);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.pillar:hover {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), 0 0 0 0.5px rgba(0, 0, 0, 0.04) inset;
}

@media (prefers-reduced-motion: reduce) {
  .pillar {
    transition: none;
  }

  .pillar:hover {
    transform: none;
  }
}

.pillar h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  color: var(--label-primary);
  letter-spacing: -0.02em;
}

.pillar p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--label-secondary);
  line-height: 1.47;
}

/* Site map list (home + prose) */
.site-map-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-sm);
}

@media (min-width: 520px) {
  .site-map-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.site-map-list a {
  font-weight: 600;
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
}

.site-map-list a::before {
  content: "›";
  color: var(--label-tertiary);
  font-weight: 600;
}

.site-map-block {
  background: linear-gradient(
    155deg,
    rgba(255, 255, 255, 0.86) 0%,
    rgba(255, 255, 255, 0.52) 55%,
    rgba(255, 255, 255, 0.34) 100%
  );
  backdrop-filter: var(--liquid-blur-chrome);
  -webkit-backdrop-filter: var(--liquid-blur-chrome);
  border: 1px solid var(--glass-edge-hairline);
  border-radius: var(--radius-xl);
  padding: var(--space-md);
  max-width: 42rem;
  margin-inline: auto;
  box-shadow:
    0 1px 0 var(--glass-edge-specular) inset,
    0 28px 72px rgba(0, 0, 0, 0.14),
    var(--shadow);
}

.site-map-block h2 {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  color: var(--label-primary);
}

/* Page layout */
.page-hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  background: var(--bg-grouped-primary);
  border-bottom: 0.5px solid var(--separator);
}

.page-hero__kicker {
  margin: 0 0 var(--space-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-brand);
}

.page-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.1;
  margin: 0 0 var(--space-md);
  color: var(--label-primary);
  letter-spacing: -0.03em;
}

.page-hero p {
  margin: 0;
  color: var(--label-secondary);
  font-size: 1.125rem;
  max-width: 52ch;
  line-height: 1.5;
}

.prose {
  max-width: var(--prose-measure);
  padding-bottom: var(--space-2xl);
}

.prose h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.375rem;
  margin: var(--space-lg) 0 var(--space-sm);
  color: var(--label-primary);
  letter-spacing: -0.022em;
}

.prose h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: var(--space-md) 0 var(--space-xs);
  color: var(--label-primary);
}

.prose p,
.prose ul {
  margin: 0 0 var(--space-sm);
}

.prose ul {
  padding-left: 1.25rem;
}

.prose li {
  margin-bottom: var(--space-xs);
}

.callout {
  background: var(--accent-brand-muted);
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  margin: var(--space-md) 0;
  border: 0.5px solid var(--separator);
  border-left: 3px solid var(--accent-brand);
  box-shadow: none;
}

.callout p:last-child {
  margin-bottom: 0;
}

.form {
  max-width: 32rem;
  display: grid;
  gap: var(--space-md);
  padding-bottom: var(--space-xl);
}

.form label {
  display: block;
  font-weight: 600;
  font-size: 0.8125rem;
  margin-bottom: var(--space-xs);
  color: var(--label-secondary);
}

.form input,
.form textarea,
.form select {
  width: 100%;
  padding: 0.75rem 1rem;
  min-height: 44px;
  border: none;
  border-radius: 10px;
  font: inherit;
  font-size: 1.0625rem;
  background: var(--fill-tertiary);
  color: var(--label-primary);
  accent-color: var(--apple-blue);
}

.form textarea {
  min-height: 8rem;
  resize: vertical;
}

.form input:focus-visible,
.form textarea:focus-visible,
.form select:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--apple-blue);
  background: var(--bg-grouped-primary);
}

.form small {
  color: var(--label-secondary);
  font-size: 0.8125rem;
}

.site-footer {
  background: linear-gradient(
    180deg,
    rgba(54, 54, 58, 0.96) 0%,
    rgba(20, 20, 24, 0.93) 100%
  );
  backdrop-filter: blur(44px) saturate(200%);
  -webkit-backdrop-filter: blur(44px) saturate(200%);
  color: rgba(255, 255, 255, 0.75);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.1) inset,
    0 -20px 60px rgba(0, 0, 0, 0.2);
}

.site-footer a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-footer a:hover {
  color: #ffffff;
}

.site-footer__grid {
  display: grid;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

@media (min-width: 640px) {
  .site-footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.site-footer h2 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin: 0 0 var(--space-sm);
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer li {
  margin-bottom: var(--space-xs);
}

.site-footer__bottom {
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.9rem;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page main {
  flex: 1;
}

/* Informational closer — not a conversion strip (strategy: describe, don’t funnel) */
.continuity-panel {
  background: var(--bg-grouped-secondary);
  border-top: 0.5px solid var(--separator);
  padding: var(--space-2xl) 0;
  text-align: center;
}

.continuity-panel h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  margin: 0 0 var(--space-md);
  letter-spacing: -0.02em;
  color: var(--label-primary);
}

.continuity-panel p {
  margin: 0 auto var(--space-md);
  color: var(--label-secondary);
  font-size: 1.0625rem;
  line-height: 1.5;
  max-width: 48ch;
}

.continuity-panel p:last-child {
  margin-bottom: 0;
}

.continuity-panel .continuity-panel__action {
  margin-top: var(--space-sm);
}

.continuity-panel .continuity-panel__action a {
  font-weight: 600;
  font-size: 1.0625rem;
}

.ref-list {
  font-size: 0.9375rem;
  color: var(--label-secondary);
  line-height: 1.47;
}

.ref-list li {
  margin-bottom: var(--space-sm);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* HIG: keyboard focus clearly visible (supplement control-specific rings) */
:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--focus-ring-color);
  outline-offset: 2px;
}

.btn:focus-visible {
  outline-offset: 3px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --apple-blue: #0a84ff;
    --apple-blue-pressed: #409cff;
    --label-primary: #ffffff;
    --label-secondary: rgba(235, 235, 245, 0.6);
    --label-tertiary: rgba(235, 235, 245, 0.3);
    --separator: rgba(84, 84, 88, 0.65);
    --fill-tertiary: rgba(118, 118, 128, 0.24);
    --fill-quaternary: rgba(118, 118, 128, 0.18);
    --bg-grouped-primary: #1c1c1e;
    --bg-grouped-secondary: #000000;
    --color-ink: var(--label-primary);
    --color-ink-muted: var(--label-secondary);
    --color-chalkboard: var(--label-primary);
    --glass-panel-bg: rgba(44, 44, 46, 0.72);
    --glass-panel-border: rgba(255, 255, 255, 0.12);
    --glass-panel-highlight: rgba(255, 255, 255, 0.1);
    --glass-surface-top: rgba(58, 58, 60, 0.88);
    --glass-surface-mid: rgba(40, 40, 42, 0.62);
    --glass-surface-bottom: rgba(28, 28, 30, 0.48);
    --glass-edge-specular: rgba(255, 255, 255, 0.22);
    --glass-edge-hairline: rgba(255, 255, 255, 0.16);
    --focus-ring-color: var(--apple-blue);
    --shadow-material: 0 4px 24px rgba(0, 0, 0, 0.35);
  }

  body {
    background-image:
      radial-gradient(120% 70% at 88% -15%, rgba(10, 132, 255, 0.12), transparent 52%),
      radial-gradient(80% 55% at -5% 45%, rgba(100, 210, 255, 0.08), transparent 48%);
  }

  .site-header--home {
    background: linear-gradient(
      180deg,
      rgba(56, 56, 58, 0.9) 0%,
      rgba(30, 30, 32, 0.62) 100%
    );
  }

  .breadcrumb-bar {
    background: linear-gradient(
      180deg,
      rgba(46, 46, 48, 0.86) 0%,
      rgba(28, 28, 30, 0.62) 100%
    );
    border-bottom-color: rgba(255, 255, 255, 0.16);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.14) inset;
  }

  .site-map-block {
    background: linear-gradient(
      155deg,
      rgba(56, 56, 58, 0.86) 0%,
      rgba(32, 32, 34, 0.6) 100%
    );
    border-color: rgba(255, 255, 255, 0.18);
  }

  .nav-toggle {
    background: linear-gradient(180deg, rgba(56, 56, 58, 0.85), rgba(36, 36, 38, 0.55));
    border-color: rgba(255, 255, 255, 0.12);
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header,
  .site-header--home,
  .breadcrumb-bar,
  .site-map-block,
  .site-footer,
  .nav-toggle,
  .slide-glass {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }

  .site-header,
  .site-header--home {
    background: var(--bg-grouped-primary);
    border-bottom-color: var(--separator);
    box-shadow: none;
  }

  .breadcrumb-bar {
    background: var(--bg-grouped-primary);
    border-bottom-color: var(--separator);
    box-shadow: none;
  }

  .site-map-block {
    background: var(--fill-quaternary);
    border-color: var(--separator);
    box-shadow: var(--shadow);
  }

  .site-footer {
    background: #1c1c1e;
    border-top-color: var(--separator);
    box-shadow: none;
  }

  .nav-toggle {
    background: var(--fill-quaternary);
    border-color: var(--color-border);
  }

  .slide-glass {
    background: var(--glass-panel-bg);
    border-color: var(--glass-panel-border);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
  }
}

/* Inclusion / Materials: stronger separation & type when user requests higher contrast */
@media (prefers-contrast: more) {
  :focus-visible {
    outline-width: 3px;
    outline-offset: 3px;
  }

  a {
    text-decoration-thickness: 2px;
  }

  .site-header,
  .breadcrumb-bar {
    border-bottom-width: 1px;
  }

  .nav-primary a[aria-current="page"],
  .breadcrumb [aria-current="page"] {
    text-decoration: underline;
    text-underline-offset: 3px;
  }
}

@media (prefers-contrast: more) and (prefers-color-scheme: light) {
  :root {
    --label-secondary: rgba(60, 60, 67, 0.72);
    --label-tertiary: rgba(60, 60, 67, 0.45);
    --separator: rgba(60, 60, 67, 0.42);
  }
}

@media (prefers-contrast: more) and (prefers-color-scheme: dark) {
  :root {
    --label-secondary: rgba(235, 235, 245, 0.78);
    --label-tertiary: rgba(235, 235, 245, 0.5);
    --separator: rgba(255, 255, 255, 0.4);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}