:root {
  --paper: #f4efe6;
  --paper-2: #fffbf5;
  --ink: #161410;
  --ink-soft: #4a453c;
  --line: #d9d0c1;
  --accent: #b84a1a;
  --accent-ink: #fff8f2;
  --forest: #1f4d3a;
  --gold: #c4a35a;
  --shadow: 0 18px 40px rgba(22, 20, 16, 0.08);
  --radius: 18px;
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "Figtree", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --header-h: 4.25rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141210;
    --paper-2: #1c1916;
    --ink: #f4efe6;
    --ink-soft: #c9c2b6;
    --line: #3a342c;
    --accent: #e06a38;
    --accent-ink: #1a100c;
    --forest: #8fbfa6;
    --gold: #d4b56a;
    --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  }
}

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

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

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

h1 {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 6vw, 4.4rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.08;
  overflow-wrap: anywhere;
}

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

a:hover { color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  z-index: 100;
}

.skip-link:focus { top: 1rem; }

.wrap {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
  padding-inline: env(safe-area-inset-left) env(safe-area-inset-right);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 0.75rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex-shrink: 0;
  min-width: 0;
}

.logo-text { white-space: nowrap; }

.logo-mark {
  width: 0.85rem;
  height: 0.85rem;
  background: var(--accent);
  border-radius: 2px;
  transform: rotate(12deg);
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
}

.site-nav a:hover { color: var(--accent); }

.nav-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--line);
  background: var(--paper-2);
  border-radius: 8px;
  position: relative;
  flex-shrink: 0;
  cursor: pointer;
}

.nav-toggle span:not(.sr-only),
.nav-toggle span:not(.sr-only)::before,
.nav-toggle span:not(.sr-only)::after {
  content: "";
  position: absolute;
  left: 0.55rem;
  right: 0.55rem;
  height: 2px;
  background: var(--ink);
}

.nav-toggle span:not(.sr-only) { top: 50%; }
.nav-toggle span:not(.sr-only)::before { top: -6px; }
.nav-toggle span:not(.sr-only)::after { top: 6px; }

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 1.1rem 0 0;
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  opacity: 0.6;
}

.hero {
  padding: 2.5rem 0 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--forest);
  margin: 0 0 0.8rem;
}

.hero h1 {
  margin: 0 0 1rem;
}

.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 40rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0 0.8rem;
}

.hero-note {
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.75rem 1.2rem;
  min-height: 2.75rem;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover { filter: brightness(1.08); color: var(--accent-ink); }

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn-ghost:hover { border-color: var(--ink); color: var(--ink); }

.btn-small {
  padding: 0.45rem 0.9rem;
  font-size: 0.88rem;
  margin-top: 0.75rem;
}

.hero-card,
.author-card,
.prompt-card,
.builder-form {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card { padding: 1.5rem 1.6rem; }

.hero-card-kicker {
  margin: 0 0 0.8rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.formula-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: f;
}

.formula-list li {
  counter-increment: f;
  padding: 0.55rem 0 0.55rem 2.2rem;
  border-top: 1px solid var(--line);
  position: relative;
}

.formula-list li::before {
  content: counter(f);
  position: absolute;
  left: 0;
  top: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}

.stats {
  border-block: 1px solid var(--line);
  background: color-mix(in srgb, var(--gold) 12%, var(--paper));
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding: 1.1rem 0;
  font-size: 0.95rem;
}

.stats-row span {
  display: block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
}

.prose-page { padding: 3rem 0; }

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.8rem;
}

.prose h3 {
  font-size: 1.15rem;
  margin: 0 0 0.4rem;
}

.prose p { color: var(--ink-soft); }

.steps {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.step-num {
  display: inline-flex;
  width: 1.6rem;
  height: 1.6rem;
  margin-right: 0.4rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 0.8rem;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
}

.code-figure {
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem 1.3rem;
  margin: 1.4rem 0;
}

.code-figure figcaption {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.7;
  margin-bottom: 0.6rem;
}

.code-figure pre {
  white-space: pre-wrap;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.55;
  margin: 0;
}

.code-figure .btn { background: var(--gold); color: #1a140c; }

.library {
  padding: 1rem 0 2rem;
}

.page-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 0 3rem;
}

.page-nav-card {
  width: 100%;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.4rem 1.5rem 1.5rem;
}

.page-nav-card h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.page-nav-card p {
  color: var(--ink-soft);
  max-width: 40rem;
  margin: 0 0 1rem;
}

.section-head { max-width: 40rem; margin-bottom: 1.5rem; }

.library-toolbar {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.library-toolbar input[type="search"],
.builder-form input,
.builder-form select,
.prompt-text {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  border-radius: 12px;
  padding: 0.8rem 1rem;
  font: inherit;
}

.prompt-text {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.55;
  resize: vertical;
  min-height: 8.5rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.chip {
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  font: inherit;
  font-size: 0.88rem;
  cursor: pointer;
}

.chip.is-active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem;
}

.prompt-card { overflow: hidden; display: flex; flex-direction: column; }

.prompt-figure {
  margin: 0;
  background: #1a1612;
}

.prompt-figure figcaption {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.prompt-figure img,
.prompt-image {
  width: 100%;
  height: auto;
  aspect-ratio: 400 / 240;
  object-fit: cover;
  display: block;
  background: #1a1612;
}

.prompt-body { padding: 1.15rem 1.2rem 1.3rem; display: flex; flex-direction: column; gap: 0.55rem; flex: 1; }

.prompt-meta {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
  align-items: center;
  font-size: 0.8rem;
}

.pill {
  background: color-mix(in srgb, var(--gold) 28%, var(--paper-2));
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  font-weight: 600;
}

.meta-muted { color: var(--ink-soft); }

.prompt-body h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 0;
  letter-spacing: -0.02em;
}

.prompt-body p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.builder {
  padding: 3rem 0;
  background: color-mix(in srgb, var(--forest) 8%, var(--paper));
  border-block: 1px solid var(--line);
}

.builder-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 2rem;
  align-items: start;
}

.builder-form {
  padding: 1.3rem;
  display: grid;
  gap: 0.85rem;
}

.field { display: grid; gap: 0.35rem; }

.field label { font-weight: 600; font-size: 0.88rem; }

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.tip-list { padding-left: 1.1rem; color: var(--ink-soft); }

.tip-list li { margin-bottom: 0.7rem; }

.faq-list details {
  border-top: 1px solid var(--line);
  padding: 0.9rem 0;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 650;
  list-style: none;
}

.faq-list summary::-webkit-details-marker { display: none; }

.faq-list summary::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-family: var(--font-mono);
}

.faq-list details[open] summary::after { content: "–"; }

.author-card { padding: 1.4rem 1.5rem; margin-top: 2.5rem; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0 1.5rem;
  background: var(--paper-2);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 1fr 0.9fr;
  gap: 1.5rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 0.5rem;
}

.footer-heading {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 0.7rem;
}

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

.site-footer li { margin: 0.3rem 0; }

.site-footer a, .text-btn {
  color: var(--ink);
  text-decoration: none;
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  cursor: pointer;
}

.site-footer a:hover, .text-btn:hover { color: var(--accent); }

.footer-meta {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.footer-disclaimer {
  max-width: 52rem;
  margin: 0 0 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
  line-height: 1.55;
}

.footer-disclaimer strong {
  color: var(--ink);
}

.toast {
  position: fixed;
  bottom: max(1.2rem, env(safe-area-inset-bottom));
  right: max(1.2rem, env(safe-area-inset-right));
  left: auto;
  background: var(--ink);
  color: var(--paper);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  z-index: 80;
  font-size: 0.9rem;
  max-width: min(20rem, calc(100vw - 2rem));
}

.empty-state {
  padding: 1rem;
  border: 1px dashed var(--line);
  border-radius: 12px;
}

.prompt-card.is-hidden { display: none; }

body.nav-open {
  overflow: hidden;
}

@media (max-width: 1100px) {
  .nav-toggle { display: inline-block; }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--paper-2);
    border-bottom: 1px solid var(--line);
    padding: 0.6rem 1rem 1rem;
    max-height: min(70vh, 28rem);
    overflow-y: auto;
  }

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

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
  }

  .site-nav a {
    width: 100%;
    padding: 0.55rem 0.2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 960px) {
  .hero-grid,
  .builder-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 1.75rem 0 2.25rem;
  }

  .prose-page { padding: 2rem 0; }

  .stats-row,
  .steps,
  .field-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .wrap {
    width: min(1120px, calc(100% - 1.25rem));
  }

  .prompt-grid,
  .steps,
  .field-row,
  .stats-row,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .stats-row { grid-template-columns: 1fr 1fr; }

  .hero-actions .btn,
  .page-nav .btn,
  .prompt-actions .btn {
    flex: 1 1 12rem;
  }

  .page-nav {
    flex-direction: column;
    align-items: stretch;
  }

  .page-nav .btn { width: 100%; }

  .prompt-body h3 { font-size: 1.2rem; }

  .library-toolbar input[type="search"],
  .builder-form input,
  .builder-form select,
  .prompt-text {
    font-size: 1rem;
  }

  .toast {
    left: 1rem;
    right: 1rem;
    bottom: max(1rem, env(safe-area-inset-bottom));
    text-align: center;
  }
}

@media (max-width: 480px) {
  body { font-size: 1rem; }

  .lede { font-size: 1.02rem; }

  .stats-row {
    font-size: 0.88rem;
    gap: 0.75rem;
  }

  .chip {
    min-height: 2.5rem;
    padding: 0.45rem 0.85rem;
  }

  .footer-disclaimer { padding: 0.8rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

@media print {
  .site-header, .hero-actions, .library-toolbar, .prompt-actions, .site-footer, .builder, .nav-toggle, .page-nav {
    display: none !important;
  }
  body { background: #fff; color: #000; }
  .prompt-card { break-inside: avoid; box-shadow: none; }
}