:root {
  color-scheme: light;
  --volcano-paper: #f3f0e8;
  --volcano-ink: #20261f;
  --volcano-muted: #5e665d;
  --volcano-faint: #7c8279;
  --volcano-line: #c9c8be;
  --volcano-accent: #435f4a;
  --volcano-warm: #9a5b2f;
  font-family: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--volcano-paper);
  color: var(--volcano-ink);
  font-size: 1.1rem;
  line-height: 1.7;
}

a { color: var(--volcano-accent); text-underline-offset: 0.18em; }
a:hover { color: var(--volcano-warm); }

.volcano-shell {
  width: min(100% - 3rem, 68rem);
  margin-inline: auto;
}

.volcano-skip-link {
  position: fixed;
  z-index: 2;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--volcano-ink);
  color: var(--volcano-paper);
  transform: translateY(-150%);
}

.volcano-skip-link:focus { transform: none; }
.volcano-header { border-bottom: 1px solid var(--volcano-line); }

.volcano-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 5.5rem;
  gap: 1rem;
}

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

.volcano-home-link {
  color: var(--volcano-ink);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
}

.volcano-mark,
.eyebrow {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.volcano-mark { color: var(--volcano-accent); }
.eyebrow { margin: 0 0 1.1rem; color: var(--volcano-warm); }

.volcano-mode-toggle {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--volcano-line);
  border-radius: 10rem;
  background: transparent;
  color: var(--volcano-muted);
  font: 700 0.72rem/1 ui-sans-serif, system-ui, sans-serif;
  cursor: pointer;
}

.volcano-mode-toggle:hover,
.volcano-mode-toggle:focus-visible {
  border-color: var(--volcano-accent);
  color: var(--volcano-accent);
}

.volcano-reader-toggle {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--volcano-accent);
  border-radius: 10rem;
  background: var(--volcano-accent);
  color: var(--volcano-paper);
  font: 700 0.72rem/1 ui-sans-serif, system-ui, sans-serif;
  cursor: pointer;
}

.volcano-reader-toggle:hover,
.volcano-reader-toggle:focus-visible {
  background: var(--volcano-warm);
  border-color: var(--volcano-warm);
}

[data-volcano-mode="dark"] {
  color-scheme: dark;
  --volcano-paper: #1d211e;
  --volcano-ink: #e2e2d7;
  --volcano-muted: #b0b3a8;
  --volcano-faint: #8b9187;
  --volcano-line: #454b43;
  --volcano-accent: #a9c1a5;
  --volcano-warm: #d09a6b;
}

.volcano-placeholder-page {
  max-width: 43rem;
  min-height: 70vh;
  padding: 8rem 0;
}

.volcano-placeholder-page h1 {
  margin: 0;
  color: var(--volcano-ink);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.volcano-placeholder-copy {
  margin: 2rem 0 0;
  color: var(--volcano-muted);
  font-size: 1.25rem;
}

.volcano-reader-view { margin-top: 2rem; }
.volcano-reader-page { min-height: 8rem; }
.volcano-reader-page[hidden] { display: none; }
.volcano-reader-controls { display: none; }

[data-volcano-reader="on"] {
  color-scheme: light;
  --volcano-paper: #ffffff;
  --volcano-ink: #000000;
  --volcano-muted: #111111;
  --volcano-faint: #000000;
  --volcano-line: #000000;
  --volcano-accent: #000000;
  --volcano-warm: #000000;
}

html[data-volcano-reader="on"] body {
  height: 100svh;
  overflow: hidden;
}

[data-volcano-reader="on"] .volcano-placeholder-page {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  height: calc(100svh - 5.5rem);
  min-height: 0;
  padding: 3rem 0 2rem;
}

[data-volcano-reader="on"] .volcano-reader-view {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
  margin-top: 1rem;
}

[data-volcano-reader="on"] .volcano-reader-page {
  min-height: 0;
  overflow: hidden;
  padding: 2rem 0;
}

[data-volcano-reader="on"] .volcano-reader-page .volcano-placeholder-copy {
  max-width: 38rem;
  margin: 0;
  color: var(--volcano-ink);
  font-size: clamp(1.35rem, 2.5vw, 1.7rem);
  line-height: 1.8;
}

[data-volcano-reader="on"] .volcano-reader-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--volcano-line);
  font: 700 0.78rem/1 ui-sans-serif, system-ui, sans-serif;
}

[data-volcano-reader="on"] .volcano-reader-controls button {
  min-width: 3rem;
  min-height: 2.75rem;
  border: 1px solid var(--volcano-line);
  background: var(--volcano-paper);
  color: var(--volcano-ink);
  font-size: 1.4rem;
  cursor: pointer;
}

[data-volcano-reader="on"] .volcano-reader-controls button:disabled {
  opacity: 0.35;
  cursor: default;
}

@media (max-width: 700px) {
  .volcano-shell { width: min(100% - 2rem, 68rem); }
  .volcano-header-inner { min-height: 4.5rem; }
  .volcano-header-actions { align-items: flex-end; flex-direction: column; gap: 0.35rem; }
  .volcano-placeholder-page { min-height: 75vh; padding: 5rem 0; }

  [data-volcano-reader="on"] .volcano-placeholder-page {
    height: calc(100svh - 4.5rem);
    padding: 2rem 0 1rem;
  }
}

@media (prefers-contrast: more) {
  :root {
    --volcano-muted: var(--volcano-ink);
    --volcano-faint: var(--volcano-ink);
    --volcano-line: currentColor;
  }
}

@media print {
  .volcano-header { border-color: #000; }
}