/* ─── FONTS ─── */
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/SpaceGrotesk-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('fonts/SpaceGrotesk-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('fonts/SpaceGrotesk-700.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('fonts/IBMPlexMono-400.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('fonts/IBMPlexMono-600.woff2') format('woff2');
}

/* ─── TOKENS ─── */
:root {
  /* Neutrals */
  --paper:        #FAFAF7;
  --paper-raised: #F2F2EE;
  --ink:          #111110;
  --ink-soft:     #52524E;
  --ink-faint:    #A3A39C;
  --rule:         #DCDCD5;

  /* Dark surface (figure panels, code blocks) */
  --dark-bg:      #101010;
  --dark-fg:      #E8E8E2;
  --dark-rule:    #2A2A28;

  /* Signal — change-state ONLY, never decorative */
  --signal-added:    #1A9E55;
  --signal-removed:  #D43B3B;
  --signal-modified: #C7860A;
  --signal-renamed:  #52524E; /* = ink-soft */

  /* Type */
  --font-sans: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  /* Grid */
  --max-width: 1080px;
  --section-v: 96px;
  --section-v-mobile: 48px;
}

/* ─── RESET ─── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ─── NAV ─── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 56px;
}

.nav-wordmark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-wordmark-glyph {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-wordmark-glyph span {
  display: inline-block;
  width: 3px;
  height: 12px;
  background: var(--ink-faint);
}

.nav-wordmark-glyph span.tick-a { background: var(--signal-added); height: 16px; }
.nav-wordmark-glyph span.tick-m { background: var(--signal-modified); height: 20px; }
.nav-wordmark-glyph span.tick-r { background: var(--signal-removed); height: 14px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.1s;
}

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

/* ─── SECTION HEADER ─── */
.section-label {
  border-bottom: 1px solid var(--rule);
  padding: 12px 40px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
}

.section-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ─── HERO ─── */
.hero {
  border-bottom: 1px solid var(--rule);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--section-v) 40px;
}

.hero-head {
  max-width: 720px;
  margin-bottom: 64px;
}

.hero-h1 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(36px, 5.5vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 18px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 580px;
  margin-bottom: 40px;
}

/* Animated trace */
.hero-trace {
  width: 100%;
  max-width: 560px;
  height: 24px;
  margin-bottom: 40px;
  overflow: hidden;
}

.trace-svg {
  width: 100%;
  height: 24px;
}

.trace-line {
  stroke: var(--rule);
  stroke-width: 1;
}

.trace-tick-a { fill: var(--signal-added); }
.trace-tick-m { fill: var(--signal-modified); }
.trace-tick-r { fill: var(--signal-removed); }

.trace-tick-animated {
  animation: trace-pulse 3s ease-in-out infinite;
}

@keyframes trace-pulse {
  0%, 100% { opacity: 0.6; }
  50%       { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .trace-tick-animated { animation: none; opacity: 0.8; }
}

/* CTAs */
.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.install-cmd {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--dark-bg);
  border: 1px solid var(--dark-rule);
  padding: 12px 20px;
  cursor: pointer;
  position: relative;
}

.install-cmd code {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
  color: var(--dark-fg);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.copy-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  transition: color 0.1s;
}

.copy-btn:hover { color: var(--signal-added); }

.btn-github {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--rule);
  padding: 11px 20px;
  transition: border-color 0.1s, color 0.1s;
}

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

/* Hero figure plate */
.hero-figure {
  border: 1px solid var(--rule);
  background: var(--dark-bg);
  position: relative;
}

/* Blueprint grid bg on dark panels */
.figure-grid-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--dark-rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--dark-rule) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

.hero-figure .fig-inner {
  position: relative;
  z-index: 1;
  padding: 0;
  line-height: 0;
}

.hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 480px;
  object-fit: contain;
  object-position: center;
}

.fig-caption {
  border-top: 1px solid var(--dark-rule);
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: var(--dark-bg);
}

/* Corner registration marks */
.hero-figure::after {
  content: '';
  position: absolute;
  top: -1px;
  right: -1px;
  width: 12px;
  height: 12px;
  border-top: 2px solid var(--ink-faint);
  border-right: 2px solid var(--ink-faint);
  pointer-events: none;
}

/* ─── SECTION WRAPPER ─── */
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--section-v) 40px;
}

/* ─── 01 GROUND TRUTH ─── */
#ground-truth {
  border-bottom: 1px solid var(--rule);
}

.ground-truth-body {
  max-width: 680px;
}

.ground-h2 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 32px;
}

.ground-paras {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.ground-para {
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.ground-para strong {
  color: var(--ink);
  font-weight: 500;
}

.ground-pull {
  border-left: 2px solid var(--rule);
  padding-left: 24px;
  margin-top: 40px;
}

.ground-pull p {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink);
}

.ground-pull p + p {
  margin-top: 12px;
  color: var(--ink-soft);
  font-weight: 400;
  font-size: 16px;
}

/* ─── 02 SNAPSHOT → DIFF → NARRATE ─── */
#pipeline {
  border-bottom: 1px solid var(--rule);
}

.pipeline-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  border: 1px solid var(--rule);
}

.pipeline-plate {
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
}

.pipeline-plate:last-child {
  border-right: none;
}

.plate-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--rule);
}

.plate-step {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: block;
  margin-bottom: 4px;
}

.plate-name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.plate-body {
  flex: 1;
  padding: 24px;
  background: var(--dark-bg);
  position: relative;
  min-height: 240px;
}

.plate-body-inner {
  position: relative;
  z-index: 1;
}

/* Blob/tree diagram */
.blob-tree {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--dark-fg);
}

.blob-tree .bt-root { color: var(--ink-faint); font-size: 10px; letter-spacing: 0.1em; }
.blob-tree .bt-obj  { color: var(--signal-added); }
.blob-tree .bt-hash { color: var(--ink-faint); font-size: 11px; }

/* JSON diff specimen */
.json-diff {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.85;
  color: var(--dark-fg);
  white-space: pre;
}

.json-key   { color: var(--ink-faint); }
.json-str   { color: var(--dark-fg); }
.json-added    { color: var(--signal-added); }
.json-removed  { color: var(--signal-removed); }
.json-modified { color: var(--signal-modified); }
.json-renamed  { color: var(--signal-renamed); }

/* Narrative report */
.narrative-block {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.85;
  color: var(--dark-fg);
}

.narrative-block .nb-label {
  color: var(--ink-faint);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.narrative-block .nb-text {
  color: var(--dark-fg);
  opacity: 0.9;
}

.plate-cmd {
  padding: 12px 24px;
  border-top: 1px solid var(--rule);
  background: var(--paper-raised);
}

.plate-cmd code {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

/* ─── 03 INSTALL ─── */
#install {
  border-bottom: 1px solid var(--rule);
}

.install-methods {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 640px;
}

.install-row {
  display: flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--rule);
}

.install-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 14px 20px;
  border-right: 1px solid var(--rule);
  min-width: 100px;
  white-space: nowrap;
}

.install-row .install-cmd {
  flex: 1;
  border: none;
  padding: 14px 20px;
}

/* ─── 04 CONFIGURE ─── */
#configure {
  border-bottom: 1px solid var(--rule);
}

.config-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.config-prose {
  max-width: 380px;
}

.config-prose h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 16px;
}

.config-prose p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 16px;
}

.config-link {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: border-color 0.1s;
}

.config-link:hover { border-color: var(--ink); }

.config-figure {
  border: 1px solid var(--rule);
}

.config-toml {
  background: var(--dark-bg);
  padding: 24px;
  overflow-x: auto;
}

.config-toml pre {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--dark-fg);
  white-space: pre;
  margin: 0;
}

.toml-comment { color: var(--ink-faint); font-style: italic; }
.toml-section { color: var(--signal-modified); }
.toml-key     { color: var(--dark-fg); }
.toml-value   { color: var(--signal-added); }
.toml-string  { color: var(--dark-fg); opacity: 0.8; }
.toml-bool    { color: var(--signal-modified); }

/* ─── 05 DEPLOYED WHERE ─── */
#deployed {
  border-bottom: 1px solid var(--rule);
}

.deployed-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  border: 1px solid var(--rule);
}

.deployed-card {
  padding: 40px 32px;
  border-right: 1px solid var(--rule);
}

.deployed-card:last-child { border-right: none; }

.dc-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: block;
  margin-bottom: 12px;
}

.dc-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 12px;
  line-height: 1.3;
}

.dc-body {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ─── FOOTER ─── */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 32px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-wordmark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.footer-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.1s;
}

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

/* ─── COPY FEEDBACK ─── */
.copy-confirm {
  display: none;
  position: absolute;
  top: -32px;
  right: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--signal-added);
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 4px 10px;
  pointer-events: none;
  white-space: nowrap;
}

/* ─── SECTION DIVIDER ─── */
hr.section-rule {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 0;
}

/* ─── RESPONSIVE ─── */
@media (max-width: 860px) {
  :root {
    --section-v: var(--section-v-mobile);
  }

  .nav { padding: 0 20px; }
  .nav-links { display: none; }
  .section-label { padding: 12px 20px; }
  .section-inner { padding: var(--section-v-mobile) 20px; }

  .hero { padding: 48px 20px 40px; }

  .hero-h1 { font-size: clamp(28px, 8vw, 42px); }
  .hero-sub { font-size: 16px; }
  .hero-ctas { flex-direction: column; align-items: flex-start; }

  .pipeline-grid {
    grid-template-columns: 1fr;
  }
  .pipeline-plate {
    border-right: none;
    border-bottom: 1px solid var(--rule);
  }
  .pipeline-plate:last-child { border-bottom: none; }

  .config-layout { grid-template-columns: 1fr; }
  .config-prose { max-width: 100%; }

  .deployed-grid { grid-template-columns: 1fr; }
  .deployed-card { border-right: none; border-bottom: 1px solid var(--rule); }
  .deployed-card:last-child { border-bottom: none; }

  .site-footer { flex-direction: column; align-items: flex-start; gap: 16px; padding: 24px 20px; }
  .footer-links { flex-wrap: wrap; gap: 16px; }

  .install-row { flex-direction: column; align-items: flex-start; }
  .install-label { border-right: none; border-bottom: 1px solid var(--rule); width: 100%; }
  .install-row .install-cmd { border: none; padding: 14px 20px; }
}