:root {
  color-scheme: dark;
  --bg: #2c2c2c;
  --bg-soft: #262626;
  --panel: #333333;
  --panel-strong: #3a3a3a;
  --line: #484848;
  --line-bright: #626262;
  --text: #f3f4f4;
  --muted: #d0d0cc;
  --faint: #aaa9a4;
  --accent: #e2c75a;
  --accent-deep: #b99a2f;
  --focus: #f0d77a;
  --moss: var(--accent);
  --moss-dark: var(--accent-deep);
  --jade: var(--focus);
  --gold: var(--accent);
  --gold-muted: var(--line-bright);
  --accent-ink: #241f0b;
  --ember: #cda94b;
  --danger: #ef6671;
  --shadow: 0 22px 70px rgb(0 0 0 / 34%);
  --serif: 'Sitka Text', Charter, 'Bitstream Charter', Cambria, Georgia, serif;
  --dragon: 'Palatino Linotype', 'Book Antiqua', Palatino, Georgia, serif;
  --sans: 'Segoe UI Variable Text', 'Segoe UI', Tahoma, Arial, sans-serif;
  --mono: 'Cascadia Code', 'SFMono-Regular', Consolas, monospace;
}

:root[data-theme='light'] {
  color-scheme: light;
  --bg: #f3f4f4;
  --bg-soft: #e8e9e9;
  --panel: #fcfcfa;
  --panel-strong: #e0e1e1;
  --line: #d0d1d1;
  --line-bright: #aaacac;
  --text: #2c2c2c;
  --muted: #5e6060;
  --faint: #747676;
  --accent: #8a6410;
  --accent-deep: #76520d;
  --focus: #7f5d14;
  --moss: var(--accent);
  --moss-dark: var(--accent-deep);
  --jade: var(--focus);
  --gold: var(--accent);
  --gold-muted: var(--line-bright);
  --accent-ink: #fffaf0;
  --ember: #8a6115;
  --danger: #a92f43;
  --shadow: 0 22px 60px rgb(36 36 36 / 12%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  overflow-x: hidden;
  overflow-x: clip;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 14% 8%, color-mix(in srgb, var(--jade) 9%, transparent), transparent 27rem),
    radial-gradient(circle at 88% 18%, color-mix(in srgb, var(--gold) 7%, transparent), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.72;
  letter-spacing: 0.002em;
  overflow-x: hidden;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

.home-page::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  background:
    repeating-linear-gradient(112deg, transparent 0 4px, rgb(255 255 255 / 0.014) 4px 5px),
    repeating-linear-gradient(22deg, transparent 0 9px, rgb(0 0 0 / 0.025) 9px 10px);
  mix-blend-mode: soft-light;
}

h1,
h2,
h3,
[id] {
  scroll-margin-top: 96px;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

button,
.button,
.lesson-card a {
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease, transform 160ms ease;
}

:focus-visible {
  outline: 3px solid var(--jade);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.65rem 0.85rem;
  background: var(--text);
  color: var(--bg);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.section-shell {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 0.75rem max(20px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid color-mix(in srgb, var(--gold-muted) 52%, var(--line));
  background: color-mix(in srgb, var(--bg) 91%, transparent);
  box-shadow: inset 0 -4px 0 color-mix(in srgb, var(--bg-soft) 82%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  place-items: center;
  width: 54px;
  height: 52px;
  padding: 0 0.45rem 0.2rem;
  border: 1px solid color-mix(in srgb, var(--gold) 55%, var(--line-bright));
  border-radius: 5px 5px 18px 18px;
  background:
    radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--ember) 16%, transparent), transparent 68%),
    linear-gradient(155deg, var(--panel-strong), var(--panel));
  color: var(--text);
  box-shadow:
    inset 0 0 0 4px color-mix(in srgb, var(--bg) 52%, transparent),
    0 8px 24px color-mix(in srgb, var(--ember) 8%, transparent);
}

.brand-mark::before,
.brand-mark::after {
  content: '';
  position: absolute;
}

.brand-mark::before {
  inset: 4px;
  border: 1px solid color-mix(in srgb, var(--gold) 22%, transparent);
  border-radius: 2px 2px 13px 13px;
}

.brand-mark::after {
  top: -5px;
  left: 50%;
  width: 18px;
  height: 9px;
  border: 1px solid color-mix(in srgb, var(--gold) 55%, var(--line-bright));
  border-bottom: 0;
  background: var(--panel);
  transform: translateX(-50%) rotate(45deg);
}

.brand-mark b,
.brand-mark span {
  position: relative;
  z-index: 1;
}

.brand-mark b {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1;
}

.brand-mark span {
  margin-inline: 0.12rem;
  color: var(--ember);
  font: 800 0.68rem/1 var(--mono);
}

.brand-copy {
  display: grid;
  line-height: 1.15;
}

.brand-copy strong {
  font-family: var(--serif);
  font-size: 1.08rem;
  letter-spacing: -0.015em;
}

.brand-copy small {
  margin-top: 0.28rem;
  color: var(--faint);
  font: 700 0.7rem/1 var(--mono);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 40px;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--line-bright);
  border-radius: 5px;
  background: var(--panel);
  color: var(--text);
  font: 800 0.72rem/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--gold);
  background: var(--panel-strong);
  transform: translateY(-1px);
}

.theme-toggle:active { transform: translateY(1px); }

.theme-toggle-icon {
  position: relative;
  width: 16px;
  height: 16px;
  border: 1px solid currentColor;
  border-radius: 50%;
  overflow: hidden;
}

.theme-toggle-icon::after {
  content: '';
  position: absolute;
  inset: 2px 2px 2px 7px;
  border-radius: 0 999px 999px 0;
  background: currentColor;
  transition: inset 180ms ease, border-radius 180ms ease;
}

:root[data-theme='light'] .theme-toggle-icon::after {
  inset: 3px;
  border-radius: 50%;
}

.unlock-badge {
  font: 700 0.74rem/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.unlock-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--muted);
}

.unlock-badge i {
  width: 7px;
  height: 7px;
  border: 1px solid var(--gold);
  border-radius: 1px;
  background: transparent;
  transform: rotate(45deg);
}

.button:active,
.lesson-card a:active {
  transform: translateY(1px);
}

.hero {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1.14fr) minmax(360px, 0.86fr);
  gap: clamp(3rem, 6vw, 6rem);
  align-items: center;
  min-height: min(860px, calc(100dvh - 76px));
  padding-block: clamp(3.25rem, 7vh, 5.5rem);
}

.home-page .hero::before,
.home-page .hero::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 100vw;
  pointer-events: none;
  transform: translateX(-50%);
}

.home-page .hero::before {
  z-index: -2;
  background:
    linear-gradient(90deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 72%, transparent) 31%, color-mix(in srgb, var(--bg) 48%, transparent) 62%, var(--bg) 100%),
    linear-gradient(0deg, var(--bg) 0%, transparent 24%, transparent 76%, var(--bg) 100%),
    url('./public/vault-stage-dark.webp') center 42% / cover no-repeat;
  filter: grayscale(0.12) sepia(0.1) saturate(0.82) contrast(0.96) brightness(0.78);
  opacity: 0.31;
}

.home-page .hero::after {
  z-index: -1;
  background:
    radial-gradient(ellipse at 50% 20%, transparent 0 26%, color-mix(in srgb, var(--jade) 5%, transparent) 45%, transparent 68%),
    linear-gradient(90deg, transparent 0 49.94%, color-mix(in srgb, var(--gold-muted) 22%, transparent) 50%, transparent 50.06% 100%);
  opacity: 0.72;
}

:root[data-theme='light'] .home-page .hero::before {
  background:
    linear-gradient(90deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 72%, transparent) 31%, color-mix(in srgb, var(--bg) 56%, transparent) 62%, var(--bg) 100%),
    linear-gradient(0deg, var(--bg) 0%, transparent 24%, transparent 76%, var(--bg) 100%),
    url('./public/vault-stage-light.webp') center 42% / cover no-repeat;
  filter: grayscale(0.08) sepia(0.05) saturate(0.82) contrast(0.92) brightness(1.02);
  opacity: 0.18;
}

.home-page .hero-copy {
  position: relative;
  padding-left: clamp(1.1rem, 2.5vw, 2rem);
}

.home-page .hero-copy::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 1px;
  background: linear-gradient(transparent, var(--gold-muted) 16%, var(--gold-muted) 84%, transparent);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--gold);
  font: 800 0.8rem/1.3 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow-rule {
  display: inline-block;
  width: 64px;
  height: 1px;
  margin-left: 0.7rem;
  vertical-align: middle;
  background: var(--gold);
  opacity: 0.48;
}

h1,
h2 {
  font-family: var(--serif);
  letter-spacing: -0.025em;
  text-wrap: balance;
}

blockquote {
  font-family: var(--dragon);
  font-weight: 600;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.6rem, 4.5vw, 4.55rem);
  font-weight: 500;
  line-height: 1.06;
}

.hero-lede {
  max-width: 660px;
  margin: 1.65rem 0 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.6vw, 1.24rem);
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  min-height: 48px;
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-weight: 800;
  text-decoration: none;
  overflow: hidden;
}

.button::before {
  content: '';
  position: absolute;
  inset: -1px;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(110deg, transparent 24%, rgb(255 255 255 / 18%) 48%, transparent 72%);
  transform: translateX(-120%);
  transition: transform 520ms cubic-bezier(0.16, 1, 0.3, 1);
}

.button:hover::before { transform: translateX(120%); }

.button:hover { transform: translateY(-2px); }
.button-primary { border-color: var(--gold); background: var(--gold); color: var(--accent-ink); }
.button-primary:hover { border-color: color-mix(in srgb, var(--gold) 82%, var(--bg)); background: color-mix(in srgb, var(--gold) 82%, var(--bg)); }
.button-secondary { background: var(--panel); color: var(--text); }
.button-secondary:hover { border-color: var(--gold-muted); background: var(--panel-strong); }

.journey-facts {
  display: flex;
  gap: clamp(1.2rem, 4vw, 3.5rem);
  margin: 2.5rem 0 0;
  padding-top: 1.35rem;
  border-top: 1px solid color-mix(in srgb, var(--gold-muted) 42%, var(--line));
}

.journey-facts div { display: grid; }
.journey-facts dt { color: var(--text); font: 500 1.55rem/1 var(--serif); }
.journey-facts dd { margin: 0.4rem 0 0; color: var(--faint); font: 700 0.74rem/1 var(--mono); text-transform: uppercase; }

.hero-stage {
  position: relative;
  isolation: isolate;
  --stage-text: #f2eee4;
  --stage-muted: #b7beb8;
  --stage-moss: #e2c75a;
  --stage-jade: #f0d77a;
  min-height: 540px;
  padding: clamp(1.35rem, 3vw, 2rem);
  border: 1px solid var(--gold-muted);
  border-radius: 6px;
  background: var(--panel);
  box-shadow:
    inset 0 0 0 7px color-mix(in srgb, var(--bg) 55%, transparent),
    inset 0 0 0 8px color-mix(in srgb, var(--gold-muted) 30%, transparent),
    var(--shadow);
  overflow: hidden;
}

.hero-stage::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  width: 9px;
  height: 9px;
  border: 1px solid var(--gold-muted);
  background: var(--panel);
  transform: translate(-50%, -50%) rotate(45deg);
  z-index: 4;
}

.hero-stage::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(112deg, transparent 30%, color-mix(in srgb, var(--jade) 18%, transparent) 50%, transparent 70%);
  opacity: 0;
  transform: translateX(-80%);
  transition: opacity 420ms ease, transform 720ms cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-stage:hover::after {
  opacity: 0.42;
  transform: translateX(80%);
}

.hero-stage > :not(.vault-art) {
  position: relative;
  z-index: 2;
}

.vault-art {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: var(--panel);
}

.vault-art::before,
.vault-art::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.vault-art::before {
  background:
    radial-gradient(circle at 70% 22%, rgb(226 199 90 / 15%), transparent 13rem),
    radial-gradient(circle at 20% 58%, rgb(205 169 75 / 10%), transparent 16rem);
  mix-blend-mode: screen;
}

.vault-art::after {
  background:
    linear-gradient(to bottom, rgb(44 44 44 / 4%) 0%, rgb(44 44 44 / 12%) 36%, rgb(44 44 44 / 72%) 78%, rgb(44 44 44 / 88%) 100%),
    linear-gradient(90deg, rgb(44 44 44 / 18%), transparent 45%, rgb(44 44 44 / 10%));
}

:root[data-theme='light'] .vault-art::after {
  background:
    linear-gradient(to bottom, rgb(44 44 44 / 1%) 0%, rgb(44 44 44 / 3%) 42%, rgb(44 44 44 / 14%) 78%, rgb(44 44 44 / 30%) 100%),
    linear-gradient(90deg, rgb(44 44 44 / 4%), transparent 48%, rgb(44 44 44 / 3%));
}

.vault-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 52% center;
  filter: grayscale(0.12) sepia(0.12) saturate(0.88) contrast(1.04) brightness(0.96);
  transform: scale(1.01);
  transform-origin: center;
  transition: opacity 320ms ease, transform 700ms cubic-bezier(0.16, 1, 0.3, 1), filter 420ms ease;
}

.hero-stage:hover .vault-art img {
  filter: grayscale(0.08) sepia(0.1) saturate(0.92) contrast(1.06) brightness(0.98);
  transform: scale(1.035);
}

:root[data-theme='light'] .hero-stage {
  --stage-text: #2c2c2c;
  --stage-muted: #5e6060;
  --stage-moss: #8a6410;
  --stage-jade: #7f5d14;
  border-color: var(--line-bright);
  background: var(--panel);
  box-shadow:
    inset 0 0 0 7px rgb(243 244 244 / 68%),
    inset 0 0 0 8px color-mix(in srgb, var(--jade) 16%, transparent),
    var(--shadow);
}

:root[data-theme='light'] .vault-art {
  background: var(--panel-strong);
}

:root[data-theme='light'] .vault-art::before {
  background: radial-gradient(circle at 70% 22%, rgb(205 169 75 / 12%), transparent 13rem);
  mix-blend-mode: normal;
}

:root[data-theme='light'] .vault-art img {
  opacity: 0.94;
  filter: grayscale(0.06) sepia(0.04) saturate(0.84) contrast(1.04) brightness(0.98);
}

:root[data-theme='light'] .hero-stage:hover .vault-art img {
  opacity: 1;
  filter: grayscale(0.03) sepia(0.03) saturate(0.88) contrast(1.06) brightness(1);
}

.stage-heading,
.pressure-readout {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font: 700 0.72rem/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stage-heading {
  padding: 0.8rem 0.9rem;
  border: 1px solid color-mix(in srgb, var(--line-bright) 70%, transparent);
  border-radius: 3px;
  background: rgb(44 44 44 / 82%);
  color: var(--stage-moss);
  text-shadow: 0 1px 12px rgb(0 0 0 / 72%);
}

.status-dot {
  padding-left: 0.7rem;
  border-left: 2px solid var(--danger);
  color: var(--danger);
}

.realm-map {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1.08fr);
  gap: 0.45rem;
  align-items: center;
  margin: clamp(12rem, 28vh, 14rem) 0 1rem;
}

.map-node {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.55rem;
  align-content: center;
  min-width: 0;
  min-height: 92px;
  padding: 0.7rem;
  border: 1px solid color-mix(in srgb, var(--line-bright) 76%, transparent);
  border-radius: 3px;
  background: rgb(30 24 30 / 92%);
  box-shadow: 0 12px 26px rgb(0 0 0 / 18%);
}

.node-glyph {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--gold-muted);
  border-radius: 2px;
  color: var(--gold);
  font: 800 0.68rem/1 var(--mono);
}

.map-node span:last-of-type { display: grid; min-width: 0; }
.map-node small { color: var(--stage-muted); font: 600 0.6rem/1.25 var(--mono); text-transform: uppercase; }
.map-node strong { margin-top: 0.25rem; color: var(--stage-text); font-size: 0.78rem; white-space: nowrap; }
.map-arrow {
  justify-self: center;
  color: var(--stage-jade);
  font-family: var(--mono);
}
.map-node-database { border-color: color-mix(in srgb, var(--danger) 65%, var(--line)); }
.map-node-database .node-glyph { color: var(--ember); }

.pressure-ring {
  position: absolute;
  inset: -5px;
  z-index: -1;
  border: 1px solid color-mix(in srgb, var(--danger) 28%, transparent);
  border-radius: 5px;
}

.pressure-readout {
  padding: 0.85rem 0.9rem;
  border: 1px solid color-mix(in srgb, var(--line-bright) 60%, transparent);
  border-radius: 3px;
  background: rgb(44 44 44 / 86%);
  color: var(--stage-muted);
}
.pressure-readout strong { color: var(--danger); white-space: nowrap; }

:root[data-theme='light'] .stage-heading,
:root[data-theme='light'] .pressure-readout,
:root[data-theme='light'] .map-node {
  border-color: color-mix(in srgb, var(--jade) 26%, var(--line));
  background: rgb(252 248 245 / 90%);
  box-shadow: 0 10px 24px rgb(36 36 36 / 8%);
  text-shadow: none;
}

:root[data-theme='light'] .lesson-badge { color: #fffaf4; }

.dragon-arrival {
  position: relative;
  display: grid;
  grid-template-columns: minmax(190px, 250px) 1fr;
  gap: clamp(2.5rem, 6vw, 5.5rem);
  align-items: center;
  margin-top: 0;
  padding: clamp(2rem, 5vw, 4rem);
  border: 1px solid var(--gold-muted);
  border-top: 2px solid var(--ember);
  border-radius: 0 0 6px 6px;
  background:
    radial-gradient(circle at 12% 50%, color-mix(in srgb, var(--ember) 12%, transparent), transparent 22rem),
    linear-gradient(135deg, color-mix(in srgb, var(--panel-strong) 94%, transparent), var(--panel));
  box-shadow:
    inset 0 0 0 7px color-mix(in srgb, var(--bg) 48%, transparent);
}

.dragon-arrival::before,
.dragon-arrival::after {
  content: '';
  position: absolute;
  width: 38px;
  height: 38px;
  pointer-events: none;
}

.dragon-arrival::before {
  top: 13px;
  left: 13px;
  border-top: 1px solid var(--gold);
  border-left: 1px solid var(--gold);
}

.dragon-arrival::after {
  right: 13px;
  bottom: 13px;
  border-right: 1px solid var(--gold);
  border-bottom: 1px solid var(--gold);
}

.dragon-seal {
  position: relative;
  display: grid;
  place-items: center;
  width: min(100%, 240px);
  aspect-ratio: 4 / 5;
  border: 1px solid var(--gold-muted);
  border-radius: 46% 46% 5px 5px / 24% 24% 5px 5px;
  background: var(--panel);
  box-shadow:
    0 18px 40px rgb(0 0 0 / 22%),
    inset 0 0 0 5px color-mix(in srgb, var(--bg) 55%, transparent);
  overflow: hidden;
}

.dragon-seal i { display: none; }
.dragon-seal img {
  width: 100%;
  height: 100%;
  border-radius: inherit;
  object-fit: cover;
  object-position: 100% center;
  filter: grayscale(0.3) sepia(0.42) saturate(0.82) contrast(1.06) brightness(1.04);
  transform: scale(1.18);
  transform-origin: right center;
  transition: filter 320ms ease, transform 520ms cubic-bezier(0.16, 1, 0.3, 1);
}

.dragon-arrival:hover .dragon-seal img {
  filter: grayscale(0.22) sepia(0.38) saturate(0.88) contrast(1.08) brightness(1.08);
  transform: scale(1.23);
}

@keyframes hero-rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes vault-reveal {
  from { opacity: 0; transform: scale(1.07); }
  to { opacity: 1; transform: scale(1.01); }
}

@keyframes vault-reveal-light {
  from { opacity: 0; transform: scale(1.07); }
  to { opacity: 0.94; transform: scale(1.01); }
}

@keyframes route-signal {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 1; }
}

@keyframes pressure-signal {
  0%, 100% { opacity: 0.45; transform: scale(1); }
  50% { opacity: 0.9; transform: scale(1.025); }
}

@media (prefers-reduced-motion: no-preference) {
  .home-page .hero-copy {
    animation: hero-rise 680ms cubic-bezier(0.16, 1, 0.3, 1) 80ms backwards;
  }

  .home-page .vault-art img {
    animation: vault-reveal 900ms cubic-bezier(0.16, 1, 0.3, 1) 120ms backwards;
  }

  :root[data-theme='light'] .home-page .vault-art img {
    animation-name: vault-reveal-light;
  }

  .home-page .map-arrow {
    animation: route-signal 1.55s ease-in-out 2 900ms;
  }

  .home-page .map-arrow:nth-child(4) {
    animation-delay: 1.18s;
  }

  .home-page .pressure-ring {
    animation: pressure-signal 1.75s ease-out 2 1.1s;
  }
}

.dragon-message { max-width: 820px; }
.dragon-message h2 { max-width: 780px; margin: 0; font-family: var(--dragon); font-size: clamp(2.15rem, 3.8vw, 3.65rem); font-weight: 600; line-height: 1.16; letter-spacing: -0.018em; }
.dragon-message > p:not(.eyebrow, .dragon-signature) { max-width: 720px; color: var(--muted); font-size: 1.12rem; }
.dragon-signature { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--ember); font: 700 0.76rem/1.4 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }

.journey {
  position: relative;
  isolation: isolate;
  padding-block: clamp(6rem, 11vw, 10rem);
}

.journey::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 50%;
  z-index: -1;
  width: 100vw;
  border-block: 1px solid color-mix(in srgb, var(--gold-muted) 30%, var(--line));
  background:
    radial-gradient(circle at 14% 22%, color-mix(in srgb, var(--jade) 5%, transparent), transparent 28rem),
    radial-gradient(circle at 82% 74%, color-mix(in srgb, var(--gold) 4%, transparent), transparent 30rem),
    color-mix(in srgb, var(--bg-soft) 82%, var(--bg));
  transform: translateX(-50%);
}
.section-heading { display: grid; gap: 1.2rem; margin-bottom: clamp(3rem, 6vw, 5rem); }
.section-heading h2 { max-width: 690px; margin: 0; font-size: clamp(2.4rem, 4.1vw, 4rem); font-weight: 500; line-height: 1.08; }
.section-heading > p { max-width: 680px; margin: 0; color: var(--muted); font-size: 1.12rem; }

.lesson-path {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.35rem 4.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.lesson-path::before {
  content: '';
  position: absolute;
  top: 2.5rem;
  bottom: 5rem;
  left: 50%;
  width: 1px;
  background: linear-gradient(var(--gold-muted), var(--line) 88%, transparent);
  transform: translateX(-50%);
}

.lesson-card {
  position: relative;
}

.lesson-card:nth-child(even) {
  margin-top: 3.5rem;
}

.lesson-card::before {
  content: '';
  position: absolute;
  top: 2.15rem;
  z-index: 2;
  width: 9px;
  height: 9px;
  border: 1px solid var(--gold);
  background: var(--bg);
  transform: rotate(45deg);
}

.lesson-card:nth-child(odd)::before { right: -2.55rem; }
.lesson-card:nth-child(even)::before { left: -2.55rem; }

.lesson-card > a,
.lesson-card > div {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(72px, 1fr) auto;
  min-height: 315px;
  padding: clamp(1.4rem, 3vw, 2rem);
  border: 1px solid color-mix(in srgb, var(--gold-muted) 52%, var(--line));
  border-radius: 5px;
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--panel-strong) 58%, transparent), transparent 48%),
    color-mix(in srgb, var(--panel) 96%, transparent);
  box-shadow: inset 0 0 0 5px color-mix(in srgb, var(--bg) 32%, transparent);
  overflow: hidden;
}

.lesson-card > a::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: url('./public/vault-archive.webp') center / cover no-repeat;
  filter: grayscale(0.5) sepia(0.4) saturate(0.76) contrast(1.05) brightness(1.02);
  opacity: 0.11;
  -webkit-mask-image: linear-gradient(90deg, transparent 8%, rgb(0 0 0 / 22%) 38%, #000 76%);
  mask-image: linear-gradient(90deg, transparent 8%, rgb(0 0 0 / 22%) 38%, #000 76%);
  transform: scale(1.01);
  transform-origin: 82% 50%;
  transition: opacity 240ms ease, transform 520ms cubic-bezier(0.16, 1, 0.3, 1);
}

.lesson-card:nth-child(even) > a::after {
  background-image: url('./public/og.png');
  background-position: right 50%;
  background-size: auto 210%;
}

:root[data-theme='light'] .lesson-card > a::after {
  filter: grayscale(0.65) sepia(0.28) saturate(0.56) contrast(0.8) brightness(1.16);
  opacity: 0.075;
}

.lesson-card > a > *,
.lesson-card > div > * {
  position: relative;
  z-index: 1;
}

.lesson-card a { text-decoration: none; }
.lesson-card a:hover { border-color: var(--gold); transform: translateY(-3px); box-shadow: var(--shadow); }
.lesson-card a:hover::after { opacity: 0.14; transform: scale(1.04); }
:root[data-theme='light'] .lesson-card a:hover::after { opacity: 0.12; }
.lesson-card-active > a { background: radial-gradient(circle at 100% 0, color-mix(in srgb, var(--gold) 11%, transparent), transparent 15rem), var(--panel); }
.lesson-number { grid-column: 1; color: var(--faint); font: 500 2.35rem/1 var(--serif); }
.lesson-state { grid-column: 3; justify-self: end; align-self: start; color: var(--muted); font: 700 0.72rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.lesson-card-active .lesson-state { color: var(--gold); }
.lesson-kicker { grid-column: 1 / -1; align-self: end; margin-top: 2.5rem; color: var(--jade); font: 800 0.74rem/1 var(--mono); letter-spacing: 0.11em; text-transform: uppercase; }
.lesson-card strong { grid-column: 1 / -1; margin-top: 0.65rem; font: 500 clamp(1.7rem, 3vw, 2.65rem)/1.08 var(--serif); letter-spacing: -0.03em; }
.lesson-summary { grid-column: 1 / -1; max-width: 520px; margin-top: 0.8rem; color: var(--muted); }
.lesson-concepts { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 0; margin-top: 1.3rem; color: var(--muted); }
.lesson-concepts i { font: 700 0.7rem/1.4 var(--mono); font-style: normal; text-transform: uppercase; }
.lesson-concepts i + i::before { content: '/'; margin-inline: 0.55rem; color: var(--gold-muted); }
.lesson-link { grid-column: 1 / -1; margin-top: 1.5rem; color: var(--gold); font-weight: 800; }
.lesson-link b { margin-left: 0.35rem; }
.lesson-card:not(.lesson-card-active) { opacity: 1; }

.lesson-visual {
  position: relative;
  grid-column: 2;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: end;
  justify-self: center;
  align-self: center;
  gap: 5px;
  width: 76px;
  height: 40px;
  color: var(--jade);
  opacity: 0.78;
  transition: opacity 180ms ease, transform 240ms cubic-bezier(0.16, 1, 0.3, 1);
}

.lesson-card a:hover .lesson-visual {
  opacity: 1;
  transform: translateY(-2px);
}

.lesson-visual i {
  display: block;
  min-width: 0;
  border: 1px solid color-mix(in srgb, var(--jade) 58%, var(--line));
  border-radius: 2px;
  background: color-mix(in srgb, var(--jade) 10%, transparent);
  font-style: normal;
}

.lesson-visual[data-mark='pulse'] i:nth-child(1) { height: 28%; }
.lesson-visual[data-mark='pulse'] i:nth-child(2) { height: 74%; }
.lesson-visual[data-mark='pulse'] i:nth-child(3) { height: 48%; }
.lesson-visual[data-mark='pulse'] i:nth-child(4) { height: 92%; border-color: var(--moss); }

.lesson-visual[data-mark='pages'] {
  grid-template-columns: 1fr;
  align-content: center;
  gap: 3px;
}
.lesson-visual[data-mark='pages'] i { width: 68%; height: 5px; }
.lesson-visual[data-mark='pages'] i:nth-child(2) { transform: translateX(8px); }
.lesson-visual[data-mark='pages'] i:nth-child(3) { transform: translateX(16px); border-color: var(--moss); }
.lesson-visual[data-mark='pages'] i:nth-child(4) { transform: translateX(24px); }

.lesson-visual[data-mark='tree'] {
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  align-items: center;
}
.lesson-visual[data-mark='tree']::before,
.lesson-visual[data-mark='tree']::after {
  content: '';
  position: absolute;
  background: color-mix(in srgb, var(--jade) 48%, var(--line));
}
.lesson-visual[data-mark='tree']::before { top: 13px; left: 50%; width: 1px; height: 14px; }
.lesson-visual[data-mark='tree']::after { top: 26px; left: 17%; width: 66%; height: 1px; }
.lesson-visual[data-mark='tree'] i { z-index: 1; width: 11px; height: 11px; justify-self: center; border-radius: 50%; background: var(--panel); }
.lesson-visual[data-mark='tree'] i:first-child { grid-column: 2; }
.lesson-visual[data-mark='tree'] i:nth-child(n + 2) { grid-row: 2; }
.lesson-visual[data-mark='tree'] i:nth-child(4) { border-color: var(--moss); }

.lesson-visual[data-mark='log'] { align-items: center; }
.lesson-visual[data-mark='log'] i { height: 8px; }
.lesson-visual[data-mark='log'] i:nth-child(2) { border-color: var(--ember); }
.lesson-visual[data-mark='log'] i:nth-child(4) { background: color-mix(in srgb, var(--moss) 18%, transparent); }

.lesson-visual[data-mark='partitions'] i { height: 100%; }
.lesson-visual[data-mark='partitions'] i:nth-child(2),
.lesson-visual[data-mark='partitions'] i:nth-child(4) { background: color-mix(in srgb, var(--moss) 12%, transparent); }

.lesson-visual[data-mark='shards'] {
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  align-items: center;
}
.lesson-visual[data-mark='shards']::before,
.lesson-visual[data-mark='shards']::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 14%;
  width: 72%;
  height: 1px;
  background: color-mix(in srgb, var(--jade) 44%, var(--line));
}
.lesson-visual[data-mark='shards']::before { transform: rotate(25deg); }
.lesson-visual[data-mark='shards']::after { transform: rotate(-25deg); }
.lesson-visual[data-mark='shards'] i { z-index: 1; width: 12px; height: 12px; justify-self: center; border-radius: 50%; background: var(--panel); }

.lesson-visual[data-mark='replicas'] { display: block; }
.lesson-visual[data-mark='replicas'] i { position: absolute; width: 42px; height: 24px; }
.lesson-visual[data-mark='replicas'] i:nth-child(1) { top: 2px; left: 2px; }
.lesson-visual[data-mark='replicas'] i:nth-child(2) { top: 8px; left: 11px; }
.lesson-visual[data-mark='replicas'] i:nth-child(3) { top: 14px; left: 20px; border-color: var(--moss); }
.lesson-visual[data-mark='replicas'] i:nth-child(4) { display: none; }

.lesson-visual[data-mark='balance']::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 8px;
  width: 60px;
  height: 1px;
  background: var(--jade);
  transform: rotate(-7deg);
}
.lesson-visual[data-mark='balance']::after { content: ''; position: absolute; top: 9px; left: 50%; width: 1px; height: 28px; background: var(--jade); }
.lesson-visual[data-mark='balance'] i { height: 14px; }
.lesson-visual[data-mark='balance'] i:nth-child(1),
.lesson-visual[data-mark='balance'] i:nth-child(4) { border-color: var(--moss); }
.lesson-visual[data-mark='balance'] i:nth-child(2),
.lesson-visual[data-mark='balance'] i:nth-child(3) { visibility: hidden; }

.lesson-visual[data-mark='compass'] {
  width: 40px;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  transform: rotate(45deg);
}
.lesson-card a:hover .lesson-visual[data-mark='compass'] { transform: translateY(-2px) rotate(45deg); }
.lesson-visual[data-mark='compass'] i:nth-child(2),
.lesson-visual[data-mark='compass'] i:nth-child(3) { border-color: var(--moss); }

.lesson-card-bonus {
  grid-column: 1 / -1;
  width: min(720px, 100%);
  margin: 4.5rem auto 0;
}

.lesson-card-bonus::before {
  top: -2.8rem;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
}

.final-promise {
  position: relative;
  isolation: isolate;
  display: grid;
  align-content: center;
  min-height: 430px;
  margin-bottom: clamp(4rem, 8vw, 7rem);
  padding: clamp(3rem, 7vw, 6rem) clamp(2rem, 7vw, 6rem);
  border: 1px solid var(--gold-muted);
  border-radius: 6px;
  background:
    radial-gradient(ellipse at 50% 118%, transparent 0 34%, color-mix(in srgb, var(--gold-muted) 24%, transparent) 34.2% 34.35%, transparent 34.6% 47%, color-mix(in srgb, var(--jade) 13%, transparent) 47.2% 47.35%, transparent 47.6%),
    radial-gradient(circle at 80% 20%, color-mix(in srgb, var(--jade) 8%, transparent), transparent 22rem),
    linear-gradient(135deg, color-mix(in srgb, var(--panel-strong) 70%, var(--panel)), var(--panel));
  box-shadow: inset 0 0 0 7px color-mix(in srgb, var(--bg) 45%, transparent);
  overflow: hidden;
}

.final-promise::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, var(--panel) 0%, transparent 24%, transparent 76%, var(--panel) 100%),
    url('./public/vault-archive.webp') center 61% / cover no-repeat;
  filter: grayscale(0.58) sepia(0.36) saturate(0.66) contrast(1.02);
  opacity: 0.08;
}

:root[data-theme='light'] .final-promise::before {
  filter: grayscale(0.74) sepia(0.26) saturate(0.46) contrast(0.78) brightness(1.2);
  opacity: 0.075;
}

.final-promise blockquote {
  position: relative;
  z-index: 1;
  max-width: 930px;
  margin: 0 auto 1.8rem;
  font-size: clamp(2.05rem, 4.6vw, 4.3rem);
  line-height: 1.08;
  text-align: center;
}

.final-promise > span {
  position: relative;
  z-index: 1;
  display: block;
  margin-inline: auto;
  color: var(--gold);
  font: 700 0.72rem/1 var(--mono);
  letter-spacing: 0.1em;
  text-align: center;
  text-transform: uppercase;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 2rem;
  border-top: 1px solid color-mix(in srgb, var(--gold-muted) 40%, var(--line));
  color: var(--faint);
  font-size: 0.83rem;
}

.site-footer strong { color: var(--text); font-family: var(--serif); }
.site-footer p { margin: 0.25rem 0 0; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-stage { max-width: 640px; }
  .dragon-arrival { grid-template-columns: 180px 1fr; }
}

@media (max-width: 720px) {
  .dragon-arrival { grid-template-columns: 1fr; }
  .dragon-seal { width: 150px; aspect-ratio: 1; border-radius: 50%; }
  .lesson-path { grid-template-columns: 1fr; gap: 1rem; }
  .lesson-path::before,
  .lesson-card::before { display: none; }
  .lesson-card:nth-child(even),
  .lesson-card-bonus { margin-top: 0; }
  .lesson-card-bonus { grid-column: auto; width: 100%; }
}

@media (max-width: 620px) {
  .section-shell { width: min(100% - 28px, 1180px); }
  .site-header { min-height: 64px; padding-inline: 14px; }
  .brand-copy small, .unlock-badge { display: none; }
  .hero { padding-block: 3rem 4.5rem; }
  .home-page .hero-copy { padding-left: 1rem; }
  h1 { font-size: clamp(2.4rem, 11vw, 4.35rem); }
  .journey-facts { justify-content: space-between; gap: 0.7rem; }
  .journey-facts dd { font-size: 0.66rem; }
  .hero-actions { display: grid; }
  .button { width: 100%; }
  .hero-stage { min-height: 640px; padding: 1rem; }
  .realm-map {
    grid-template-columns: 1fr;
    margin: 8.5rem 0 1rem;
  }
  .map-node {
    grid-template-columns: auto minmax(0, 1fr);
    align-content: initial;
    align-items: center;
    min-height: 0;
    padding: 0.7rem 0.8rem;
  }
  .map-arrow { transform: rotate(90deg); }
  .dragon-arrival { padding: 2rem 1.5rem; }
  .lesson-card > a, .lesson-card > div { min-height: 280px; }
  .final-promise { min-height: 360px; padding: 3rem 1.6rem; }
  .site-footer { display: grid; }
}

@media (max-width: 440px) {
  .brand-copy { display: none; }
  .theme-toggle { width: 42px; padding-inline: 0; justify-content: center; }
  .theme-toggle [data-theme-label] { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--bg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}