/*
 * JMarkdown website — shared design system
 *
 * The look of Folio's documentation page (../../Folio/folio-docs.html):
 * a warm paper palette with a burnt-orange accent, Instrument Serif for
 * display headings, DM Sans for text and JetBrains Mono for code. The
 * tokens and component rules below are copied from that page so the two
 * sites read as one family; change a colour here and both the landing
 * page (../index.html) and the documentation shell (index.html) follow.
 *
 * This file styles the CHROME — layout, sidebar, hero, cards, buttons.
 * The documentation's rendered content (markdown-demo grids, game
 * matrices, alerts, theorems …) is styled by docs-styles.css, which
 * uses these same tokens.
 *
 * Fonts are loaded by each page's <head>:
 *   https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300..700;1,9..40,300..700&family=JetBrains+Mono:wght@400;500&display=swap
 */


/* ─── Tokens (Folio's, verbatim) ─── */

:root {
  --bg: #faf8f5;
  --bg-card: #ffffff;
  --bg-code: #f3f0eb;
  --bg-nav: #f3f0eb;
  --bg-nav-active: #e8e4dd;
  --text: #2c2418;
  --text-secondary: #6b5d4d;
  --text-tertiary: #9a8c7c;
  --accent: #b8570c;
  --accent-light: #f0dcc8;
  --accent-glow: rgba(184, 87, 12, 0.08);
  --border: #e0dbd4;
  --border-light: #ece8e2;
  --shadow-sm: 0 1px 3px rgba(44,36,24,0.04);
  --shadow-md: 0 4px 16px rgba(44,36,24,0.06);
  --shadow-lg: 0 8px 32px rgba(44,36,24,0.08);
  --radius: 10px;
  --radius-sm: 6px;
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans: 'DM Sans', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', Menlo, monospace;

  /* Folio's icon-tile palette, shared by cards, nav and code colouring */
  --tile-orange-bg: #fef0e0;  --tile-orange: #c6700a;
  --tile-blue-bg:   #e4eef9;  --tile-blue:   #3a6fb8;
  --tile-green-bg:  #e2f3e4;  --tile-green:  #3a8c42;
  --tile-purple-bg: #eee4f6;  --tile-purple: #7c3ab8;
  --tile-rose-bg:   #fce4e8;  --tile-rose:   #b83a5c;
  --tile-teal-bg:   #dff0ef;  --tile-teal:   #2a8a84;
}


/* ─── Base ───
   Folio resets every element's margin and padding with `*`. That is safe
   on a hand-written page but not here: the docs shell hosts rendered
   Markdown, whose lists, blockquotes and description lists rely on the
   browser's defaults. So only box-sizing is global, and the chrome sets
   its own margins below. */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }


/* ─── Layout ─── */

.page-wrapper {
  display: flex;
  min-height: 100vh;
}

.main-content {
  flex: 1;
  min-width: 0;
  padding: 48px 64px 120px;
  max-width: 880px;
}


/* ─── Sidebar Navigation ─── */

.sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--bg-nav);
  border-right: 1px solid var(--border);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 32px 0 48px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.sidebar-logo {
  padding: 0 24px 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.sidebar-logo a {
  color: inherit;
  text-decoration: none;
}

.sidebar-logo h1 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0;
  line-height: 1.3;
}

.sidebar-logo h1 i {
  color: var(--accent);
  font-size: 20px;
  margin-right: 8px;
  vertical-align: 1px;
}

.sidebar-logo .subtitle {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 2px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 500;
}

.nav-section {
  padding: 0 16px;
  margin-bottom: 8px;
}

.nav-section-title {
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: 16px 8px 6px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 450;
  line-height: 1.45;
  transition: all 0.15s ease;
  cursor: pointer;
}

.nav-link:hover {
  background: var(--bg-nav-active);
  color: var(--text);
}

.nav-link.active {
  background: var(--accent-glow);
  color: var(--accent);
  font-weight: 550;
}

.nav-link i {
  width: 18px;
  flex-shrink: 0;
  text-align: center;
  font-size: 13px;
  opacity: 0.7;
}

.nav-link.active i { opacity: 1; }

/* A link that leaves the page (GitHub, the docs) gets a trailing arrow. */
.nav-link .nav-out {
  margin-left: auto;
  font-size: 10px;
  width: auto;
  opacity: 0.5;
}


/* ─── Mobile top bar + drawer ───
   Folio simply hides its sidebar below 960px. The docs can't: the sidebar
   is the only way to reach the other pages. So on narrow screens a top bar
   appears and the sidebar slides in over the page as a drawer. */

.mobile-bar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 30;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: rgba(250, 248, 245, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.mobile-bar .mobile-logo {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--text);
  text-decoration: none;
  line-height: 1.2;
}

.mobile-bar .mobile-logo i {
  color: var(--accent);
  font-size: 16px;
  margin-right: 6px;
}

.menu-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
}

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 40;
  background: rgba(44, 36, 24, 0.28);
}


/* ─── Hero ─── */

.hero {
  margin-bottom: 56px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text);
  margin: 0 0 16px;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}


/* ─── Buttons ───
   The resting and hover states of Folio's download button: a quiet paper
   button that fills with the accent. `.btn-primary` starts filled. */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
}

.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #9d4a0a;
  border-color: #9d4a0a;
}


/* ─── Sections ─── */

.doc-section {
  margin-bottom: 56px;
  animation: fadeUp 0.4s ease both;
}

.doc-section h2 {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.25;
  margin: 0 0 20px;
  color: var(--text);
  scroll-margin-top: 24px;
}

.doc-section h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 32px 0 12px;
  letter-spacing: -0.01em;
}

.doc-section p {
  margin: 0 0 14px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.doc-section ul {
  margin: 0 0 14px 1.5em;
  padding: 0;
  color: var(--text-secondary);
  line-height: 1.75;
}

.doc-section ul li { margin-bottom: 10px; }

.doc-section p strong,
.doc-section li strong {
  color: var(--text);
  font-weight: 600;
}

.doc-section p a,
.doc-section li a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-light);
}

.doc-section p a:hover,
.doc-section li a:hover { border-bottom-color: var(--accent); }

/* "Read more" line closing a section. */
.section-more {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  font-weight: 550;
  color: var(--accent);
  text-decoration: none;
}

.section-more:hover { text-decoration: underline; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}


/* ─── Code (hand-written pages; rendered docs use docs-styles.css) ─── */

.doc-section code,
.hero code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

/* Ligatures off: in code a reader may copy, `>=` must not look like `⩾`. */
.doc-section code,
.doc-section pre,
.hero code {
  font-variant-ligatures: none;
  tab-size: 4;
}

.doc-section pre {
  background: var(--bg-code);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  overflow-x: auto;
  margin: 16px 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text);
}

.doc-section pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* Token colours for hand-highlighted code, after Folio's notes showcase. */
.tok-comment { color: var(--text-tertiary); }
.tok-kw      { color: var(--accent); }
.tok-str     { color: var(--tile-green); }
.tok-fn      { color: var(--tile-purple); }
.tok-num     { color: var(--tile-blue); }
.tok-tag     { color: var(--tile-rose); }
.tok-attr    { color: var(--tile-teal); }
.tok-head    { color: var(--accent); font-weight: 500; }

kbd {
  display: inline-block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 7px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  box-shadow: 0 1px 1px rgba(44,36,24,0.06);
  line-height: 1.5;
  white-space: nowrap;
}


/* ─── Feature Cards ─── */

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0;
}

.feature-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  color: inherit;
  text-decoration: none;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border);
  transform: translateY(-1px);
}

.card-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  margin-bottom: 14px;
}

.orange { background: var(--tile-orange-bg); color: var(--tile-orange); }
.blue   { background: var(--tile-blue-bg);   color: var(--tile-blue); }
.green  { background: var(--tile-green-bg);  color: var(--tile-green); }
.purple { background: var(--tile-purple-bg); color: var(--tile-purple); }
.rose   { background: var(--tile-rose-bg);   color: var(--tile-rose); }
.teal   { background: var(--tile-teal-bg);   color: var(--tile-teal); }

.feature-card h4 {
  font-size: 14.5px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--text);
}

.feature-card p {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
}


/* ─── Small tool cards (three across) ─── */

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  margin: 20px 0;
}

.tool-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  color: inherit;
  text-decoration: none;
}

.tool-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border);
  transform: translateY(-1px);
}

.tool-card .tool-icon {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-bottom: 10px;
}

.tool-card h4 {
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 4px;
  color: var(--text);
}

.tool-card p {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0;
}


/* ─── Icon list (Folio's perspective list) ─── */

.icon-list { margin: 16px 0; }

.icon-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
  color: inherit;
  text-decoration: none;
}

.icon-item:last-child { border-bottom: none; }

a.icon-item:hover h4 { color: var(--accent); }

.icon-item .item-icon {
  width: 32px;
  height: 32px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}

.icon-item h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 2px;
  transition: color 0.15s ease;
}

.icon-item p {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.55;
}


/* ─── Demo panels (Folio's table demo: a header strip over columns) ─── */

.demo-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 20px 0;
  box-shadow: var(--shadow-sm);
}

.demo-panel-header {
  padding: 10px 18px;
  background: var(--bg-code);
  border-bottom: 1px solid var(--border-light);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.demo-panel-header i { font-size: 10px; }

.demo-panel-header .file {
  font-family: var(--font-mono);
  text-transform: none;
  letter-spacing: 0;
  font-weight: 500;
  color: var(--text-secondary);
}

.demo-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.demo-col {
  padding: 18px 20px;
  min-width: 0;
}

.demo-columns .demo-col + .demo-col {
  border-left: 1px solid var(--border-light);
}

.demo-single { padding: 18px 20px; }

.demo-single + .demo-columns,
.demo-columns + .demo-single {
  border-top: 1px solid var(--border-light);
}

.demo-col-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.demo-panel pre {
  background: var(--bg-code);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text);
  margin: 0;
  overflow-x: auto;
  white-space: pre;
}

/* The rendered side of a demo: what a reader of the web page sees. */
.demo-output {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.demo-output p { margin: 0 0 10px; color: var(--text); }
.demo-output p:last-child { margin-bottom: 0; }

.demo-output .theorem-env {
  padding: 12px 14px;
  margin-bottom: 12px;
  background: var(--bg);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.demo-output .theorem-label { font-weight: 700; }
.demo-output .theorem-env p { font-style: italic; }
.demo-output .theorem-env .theorem-label { font-style: normal; }

.demo-output a { color: var(--accent); text-decoration: none; }

.demo-output sup a { font-size: 11px; }

.demo-output section.footnotes {
  margin-top: 14px;
  padding-top: 8px;
  border-top: 1px solid var(--border-light);
  font-size: 12.5px;
  color: var(--text-secondary);
}

.demo-output section.footnotes h1 {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin: 0 0 4px;
}

.demo-output section.footnotes ol { margin: 0; padding-left: 18px; }
.demo-output section.footnotes p { color: var(--text-secondary); margin: 0; }
.demo-output .footnote-backref { color: var(--text-tertiary); }

.demo-figure {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 160px;
}

.demo-figure img { width: 100%; max-width: 300px; height: auto; }

/* A terminal transcript. */
.terminal pre {
  background: #2c2418;
  border-color: #2c2418;
  color: #e8e0d4;
}

.terminal .tok-comment { color: #9a8c7c; }
.terminal .tok-ok      { color: #8fd197; }
.terminal .tok-kw      { color: #f0a868; }


/* ─── Steps (Folio's roadmap timeline, reused for installation) ─── */

.step-list {
  margin: 24px 0;
  position: relative;
  padding-left: 28px;
}

.step-list::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
  border-radius: 1px;
}

.step-item {
  position: relative;
  padding: 12px 0 14px;
}

.step-item::before {
  content: '';
  position: absolute;
  left: -25px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--accent);
}

.step-item:last-child::before {
  background: var(--bg);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.step-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 4px;
}

.step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.step-item pre { margin: 10px 0 0; }


/* ─── Callouts ─── */

.callout {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--radius);
  margin: 20px 0;
  font-size: 14px;
  line-height: 1.65;
}

.callout p { margin: 0; color: inherit; }

.callout-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  margin-top: 1px;
}

.callout.tip  { background: #e8f4e9; border: 1px solid #c5e1c8; color: #2d5a30; }
.callout.tip .callout-icon  { background: #3a8c42; color: #fff; }
.callout.info { background: #e4eef9; border: 1px solid #c0d5ee; color: #2a4a6e; }
.callout.info .callout-icon { background: #3a6fb8; color: #fff; }
.callout.warn { background: #fef5e0; border: 1px solid #f0ddb0; color: #6b4f14; }
.callout.warn .callout-icon { background: #c6880a; color: #fff; }

.callout code { background: rgba(255,255,255,0.6); color: inherit; }


/* ─── Design Principles ─── */

.principle-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0;
}

.principle-card {
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  background: var(--bg-card);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-sm);
}

.principle-card h4 {
  font-size: 14px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--text);
}

.principle-card p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
}


/* ─── Documentation map (landing page) ─── */

.docs-map {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0;
}

.docs-group {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 18px 20px 14px;
  box-shadow: var(--shadow-sm);
}

.docs-group-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.docs-group-title .tool-icon {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

.docs-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.docs-group ul li { margin: 0; }

.docs-group li a {
  display: block;
  padding: 3px 0;
  font-size: 13.5px;
  color: var(--text-secondary);
  text-decoration: none;
  border: none;
}

.docs-group li a:hover { color: var(--accent); }


/* ─── Documentation shell (docs/index.html) ─── */

/* The group a page belongs to, above its title — Folio's hero badge. */
.doc-eyebrow[hidden] { display: none; }

.content-area {
  transition: opacity 0.15s ease;
}

.content-area.is-loading { opacity: 0.4; }

.doc-missing {
  padding: 48px 24px;
  text-align: center;
  color: var(--text-tertiary);
}

.doc-missing i { font-size: 28px; }

.doc-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 64px;
}

.doc-pager:empty { display: none; }

.pager-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transition: all 0.2s ease;
}

.pager-link:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border);
  transform: translateY(-1px);
}

.pager-link.next {
  grid-column: 2;
  text-align: right;
}

.pager-dir {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
}

.pager-dir i { font-size: 10px; }

.pager-title {
  font-family: var(--font-serif);
  font-size: 21px;
  line-height: 1.3;
  color: var(--text);
}

.pager-link:hover .pager-title { color: var(--accent); }


/* ─── Footer ─── */

.site-footer {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-tertiary);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

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


/* ─── Responsive ─── */

@media (max-width: 960px) {
  .mobile-bar { display: flex; }

  .page-wrapper { display: block; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 50;
    width: min(300px, 86vw);
    height: auto;
    transform: translateX(-100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-lg);
  }

  body.nav-open .sidebar { transform: none; }
  body.nav-open .sidebar-backdrop { display: block; }

  .main-content { padding: 32px 28px 80px; max-width: none; }

  .feature-grid,
  .principle-grid,
  .docs-map { grid-template-columns: 1fr; }

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

@media (max-width: 640px) {
  .main-content { padding: 28px 16px 64px; }

  .hero h1 { font-size: 38px; }

  .tool-grid,
  .demo-columns,
  .doc-pager { grid-template-columns: 1fr; }

  .pager-link.next { grid-column: auto; }

  .demo-columns .demo-col + .demo-col {
    border-left: none;
    border-top: 1px solid var(--border-light);
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .doc-section { animation: none; }
  .sidebar { transition: none; }
}