/* chapterscript.com — dark slate terminal theme.
   All colors live here; use the variables, not literal hex, for anything new. */

:root {
  --bg: #0b0e14;
  --panel: #11161f;
  --panel-2: #151b26;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --ink: #e6edf3;
  --dim: #8b98a9;
  --faint: #5b6675;
  --mint: #56d4a0;
  --mint-dim: rgba(86, 212, 160, 0.14);
  --blue: #7aa2f7;
  --blue-dim: rgba(122, 162, 247, 0.12);
  --syn-key: #7aa2f7;
  --syn-str: #56d4a0;
  --syn-num: #e5c07b;
  --syn-comment: #5b6675;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --max-w: 1100px;
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  color-scheme: dark;
  scroll-padding-top: 5.5rem;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--mint-dim); color: var(--ink); }

a { color: var(--mint); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

code, kbd, pre { font-family: var(--font-mono); }

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Atmosphere ---------- */

.grid-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
}

.glow {
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  pointer-events: none;
}

.glow-mint { background: radial-gradient(circle, rgba(86, 212, 160, 0.35), transparent 70%); }
.glow-blue { background: radial-gradient(circle, rgba(122, 162, 247, 0.3), transparent 70%); }

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 14, 20, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.nav.scrolled { border-bottom-color: var(--border); }

.nav-inner {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  height: 4rem;
}

.wordmark {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.wordmark:hover { text-decoration: none; }
.wordmark .accent { color: var(--mint); }

.nav-links {
  display: flex;
  gap: 1.5rem;
  margin-left: auto;
  align-items: center;
}

.nav-links a {
  color: var(--dim);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a:hover { color: var(--ink); text-decoration: none; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.15rem;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border-strong);
  color: var(--ink);
  background: var(--panel);
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}

.btn:hover { text-decoration: none; border-color: var(--mint); }

.btn-primary {
  background: var(--mint);
  border-color: var(--mint);
  color: #0b1712;
}

.btn-primary:hover {
  background: #6be0af;
  border-color: #6be0af;
}

.btn-ghost { background: transparent; }

.btn svg { flex-shrink: 0; }

.nav .btn { padding: 0.45rem 0.9rem; font-size: 0.8rem; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 7rem 0 5.5rem;
  overflow: hidden;
}

.hero .glow-mint { width: 480px; height: 480px; top: -180px; left: 8%; }
.hero .glow-blue { width: 420px; height: 420px; top: -120px; right: 5%; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mint);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  max-width: 16ch;
  margin-bottom: 1.25rem;
}

.hero-sub {
  color: var(--dim);
  max-width: 44rem;
  font-size: 1.15rem;
  margin-bottom: 2.25rem;
}

.hero-sub strong { color: var(--ink); font-weight: 600; }

.hero-ctas { display: flex; gap: 0.85rem; flex-wrap: wrap; }

/* ---------- Sections ---------- */

.section { padding: 5rem 0; }
.section + .section { border-top: 1px solid var(--border); }

.section-head { max-width: 44rem; margin-bottom: 3rem; }
.section-head h2 { font-size: clamp(1.7rem, 3.5vw, 2.35rem); margin-bottom: 0.9rem; }
.section-head p { color: var(--dim); }

/* ---------- Code panel ---------- */

.code-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.code-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel-2);
}

.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-r { background: #f16a5d; }
.dot-y { background: #f5bf4f; }
.dot-g { background: #53c22b; }

.code-title {
  margin-left: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--faint);
}

.code-panel pre {
  padding: 1.35rem 1.5rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.7;
  tab-size: 2;
}

.code-panel .k { color: var(--syn-key); }
.code-panel .s { color: var(--syn-str); }
.code-panel .n { color: var(--syn-num); }
.code-panel .c { color: var(--syn-comment); font-style: italic; }

.bundle-tree {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--dim);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin-bottom: 2rem;
}

.bundle-tree .d { color: var(--blue); }
.bundle-tree .f { color: var(--ink); }
.bundle-tree .m { color: var(--faint); }

/* ---------- Concepts strip ---------- */

.concepts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.concept {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.35rem;
}

.concept::after {
  content: "→";
  position: absolute;
  right: -0.95rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--faint);
  font-family: var(--font-mono);
  z-index: 1;
}

.concept:last-child::after { content: none; }

.concept h3 {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--mint);
  margin-bottom: 0.6rem;
}

.concept p { color: var(--dim); font-size: 0.9rem; line-height: 1.55; }

/* ---------- Feature grid ---------- */

.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.feature {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.feature h3 { font-size: 1.1rem; margin-bottom: 0.6rem; }
.feature h3 code { color: var(--blue); font-size: 0.95em; }
.feature p { color: var(--dim); font-size: 0.95rem; }

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 9px;
  background: var(--mint-dim);
  color: var(--mint);
  margin-bottom: 1rem;
}

.feature:nth-child(even) .feature-icon { background: var(--blue-dim); color: var(--blue); }

/* ---------- Player section ---------- */

.player-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.cap-list { list-style: none; display: grid; gap: 0.85rem; }

.cap-list li {
  display: flex;
  gap: 0.75rem;
  color: var(--dim);
  font-size: 0.98rem;
}

.cap-list li::before {
  content: "▸";
  color: var(--mint);
  font-family: var(--font-mono);
  flex-shrink: 0;
}

.cap-list li strong { color: var(--ink); font-weight: 600; }

.player-note {
  margin-top: 2rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--blue);
  border-radius: 8px;
  background: var(--panel);
  color: var(--dim);
  font-size: 0.95rem;
}

.player-note a { color: var(--blue); }

/* ---------- Spec pointer ---------- */

.spec-links { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }

.spec-link {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.75rem;
  color: var(--ink);
  transition: border-color 0.15s;
}

.spec-link:hover { text-decoration: none; border-color: var(--mint); }
.spec-link h3 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.spec-link h3 span { color: var(--mint); font-family: var(--font-mono); font-size: 0.85em; }
.spec-link p { color: var(--dim); font-size: 0.92rem; }

/* ---------- Repo cards ---------- */

.repos { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }

.repo {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.repo h3 {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 500;
}

.repo h3 .org { color: var(--faint); }
.repo p { color: var(--dim); font-size: 0.95rem; flex: 1; }
.repo .btn { align-self: flex-start; }

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  color: var(--faint);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
  justify-content: space-between;
}

.footer a { color: var(--dim); }
.footer a:hover { color: var(--mint); }
.footer-links { display: flex; flex-wrap: wrap; gap: 1.5rem; }

/* ---------- 404 ---------- */

.err-page {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  position: relative;
}

.err-code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--mint);
  margin-bottom: 1rem;
}

.err-page h1 { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: 1rem; }
.err-page p { color: var(--dim); margin-bottom: 2rem; max-width: 38rem; }

/* ---------- Reveal on scroll ----------
   Content is visible by default. Only when JS has confirmed it will run the
   reveal (html.reveal-enabled, set only when motion is allowed) do elements
   start hidden. Reduced-motion users and no-JS visitors see everything. */

html.reveal-enabled .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

html.reveal-enabled .reveal.in {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .concepts { grid-template-columns: repeat(2, 1fr); }
  .concept::after { content: none; }
  .player-grid { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 640px) {
  .nav-links a:not(.btn) { display: none; }
  .hero { padding: 4.5rem 0 3.5rem; }
  .section { padding: 3.5rem 0; }
  .concepts, .features, .spec-links, .repos { grid-template-columns: 1fr; }
}

/* ---------- Reference sub-pages ---------- */
.docpage { padding: 8.5rem 0 5rem; }
.docpage .wrap { max-width: 860px; }
.doc-back {
  font-family: var(--font-mono); font-size: .8rem; color: var(--dim);
  display: inline-block; margin-bottom: 1.6rem; transition: color .2s;
}
.doc-back:hover { color: var(--mint); }
.docpage h1 { font-size: clamp(2rem, 4.5vw, 3rem); letter-spacing: -.02em; margin-bottom: .8rem; }
.doc-lede { color: var(--dim); font-size: 1.08rem; max-width: 60ch; margin-bottom: 3rem; }
.docpage h2 {
  font-size: 1.45rem; letter-spacing: -.01em;
  margin: 3rem 0 .9rem; padding-top: 2.2rem; border-top: 1px solid var(--border);
}
.docpage h3 { font-size: 1.05rem; margin: 1.8rem 0 .5rem; color: var(--ink); }
.docpage p, .docpage li { color: var(--dim); line-height: 1.75; }
.docpage p { margin-bottom: 1rem; }
.docpage ul { margin: 0 0 1.2rem 1.2rem; }
.docpage li { margin-bottom: .45rem; }
.docpage li::marker { color: var(--mint); }
.docpage strong { color: var(--ink); font-weight: 600; }
.docpage a:not(.doc-back):not(.btn) { color: var(--mint); }
.docpage a:not(.doc-back):not(.btn):hover { text-decoration: underline; }
.docpage pre {
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  padding: 1.1rem 1.3rem; overflow-x: auto; margin: 0 0 1.4rem;
  font-family: var(--font-mono); font-size: .82rem; line-height: 1.7; color: var(--ink);
}
.docpage table {
  width: 100%; border-collapse: collapse; margin: 0 0 1.4rem;
  font-size: .9rem;
}
.docpage th {
  font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase;
  letter-spacing: .08em; color: var(--dim); text-align: left;
  padding: .5rem .8rem; border-bottom: 1px solid var(--border);
}
.docpage td { padding: .55rem .8rem; border-bottom: 1px solid var(--border); color: var(--dim); vertical-align: top; }
.docpage td:first-child { font-family: var(--font-mono); font-size: .82rem; color: var(--ink); white-space: nowrap; }
.docpage .table-scroll { overflow-x: auto; }
.doc-callout {
  border: 1px solid var(--border); border-left: 3px solid var(--mint);
  background: var(--panel); border-radius: 8px; padding: .9rem 1.1rem; margin: 0 0 1.4rem;
}
.doc-callout p { margin: 0; font-size: .92rem; }
.doc-next { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 3rem; }
@media (max-width: 720px) { .doc-next { grid-template-columns: 1fr; } }
.docpage .spec-link h3 { margin: 0 0 .4rem; padding: 0; border: none; }
.docpage .spec-link p { margin: 0; }

/* ---------- Origin story ---------- */
.story { max-width: 680px; }
.story p { color: var(--dim); line-height: 1.8; margin-bottom: 1.1rem; }
.story p strong, .story p code { color: var(--ink); }
.story-grid {
  display: grid;
  grid-template-columns: 5fr 3fr;
  gap: 3.5rem;
  align-items: start;
}
.story-quote {
  margin: 2.2rem 0;
  padding-left: 1.4rem;
  border-left: 3px solid var(--mint);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.story-quote em { font-style: normal; color: var(--mint); }

/* The production slate card */
.slate {
  position: sticky;
  top: 5.5rem;
  background: linear-gradient(160deg, var(--panel-2), var(--panel));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}
.slate-bar {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: rgba(11, 14, 20, 0.5);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
}
.slate-rec {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 8px var(--mint);
}
@media (prefers-reduced-motion: no-preference) {
  .slate-rec { animation: rec-pulse 2s ease-in-out infinite; }
  @keyframes rec-pulse { 50% { opacity: 0.35; box-shadow: 0 0 2px var(--mint); } }
}
.slate-title {
  padding: 1.5rem 1.25rem 1.1rem;
  font-size: 2.1rem;
  line-height: 1.02;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, var(--ink) 55%, var(--mint));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.slate-facts { padding: 0 1.25rem 1.1rem; }
.slate-facts > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}
.slate-facts dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  padding-top: 0.15rem;
}
.slate-facts dd { color: var(--dim); text-align: right; }
.slate-facts .slate-none { color: var(--mint); font-family: var(--font-mono); }
.slate-foot {
  padding: 0.8rem 1.25rem;
  border-top: 1px solid var(--border);
  background: rgba(11, 14, 20, 0.5);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--faint);
}
.slate-foot code { color: var(--mint); }
@media (max-width: 860px) {
  .story-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .slate { position: static; max-width: 420px; }
}

/* ---------- Stability note ---------- */
.stability { max-width: 680px; }
.stability p { color: var(--dim); line-height: 1.8; margin-bottom: 1.1rem; }
.stability-arc {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--faint);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.8rem 1.2rem;
  display: inline-block;
  margin-bottom: 1.6rem;
  white-space: nowrap;
}
.stability-arc .now { color: var(--ink); }
.stability-arc .then { color: var(--mint); }