/* =========================================================================
   reqmd site — editorial documentation design system
   Warm, text-first, asymmetric. Not a SaaS landing page.
   ========================================================================= */

/* ---------- design tokens ---------- */
:root {
  /* type */
  --font-sans: "Inter var", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SF Mono", "Cascadia Code", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --fs-base: 17px;
  --fs-code: 0.85rem;
  --lh-base: 1.7;
  --lh-tight: 1.15;
  --tracking-tight: -0.02em;
  --tracking-snug: -0.01em;
  --tracking-wide: 0.02em;

  /* spacing — 8px base scale */
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 24px;
  --s-6: 32px; --s-7: 48px; --s-8: 64px; --s-9: 96px; --s-10: 128px;

  /* radii */
  --r-sm: 4px; --r-md: 6px; --r-lg: 10px; --r-xl: 14px;

  /* shadows — warm-tinted, minimal */
  --shadow-1: 0 1px 2px rgb(60 40 20 / 0.04);
  --shadow-2: 0 4px 16px rgb(60 40 20 / 0.06);
  --shadow-3: 0 12px 40px rgb(60 40 20 / 0.08);

  /* light mode — warm palette */
  --bg: #faf9f6;
  --bg-elev: #f3f1ec;
  --bg-sunken: #efece5;
  --bg-code: #1c1a17;
  --bg-overlay: rgb(40 30 20 / 0.35);
  --fg: #1f1c18;
  --fg-muted: #6b665e;
  --fg-faint: #a8a299;
  --fg-inverse: #faf9f6;
  --border: #e3dfd6;
  --border-strong: #d0cabc;
  --accent: #b8421a;
  --accent-hover: #9c3815;
  --accent-soft: rgb(184 66 26 / 0.08);
  --accent-fg: #faf9f6;
  --success: #3c7a3e;
  --warning: #b8730d;
  --danger: #a83a2a;
  --info: #3a6a8a;
  --selection: rgb(184 66 26 / 0.18);
  --quote-mark: #d0cabc;

  --transition: 120ms ease;
  --max-w: 1200px;
  --max-w-prose: 68ch;
  --max-w-wide: 92ch;
  --header-h: 56px;
}

[data-theme="dark"] {
  --bg: #1a1814;
  --bg-elev: #221f1a;
  --bg-sunken: #16140f;
  --bg-code: #121110;
  --bg-overlay: rgb(0 0 0 / 0.6);
  --fg: #e8e4dc;
  --fg-muted: #a8a299;
  --fg-faint: #6b665e;
  --fg-inverse: #1a1814;
  --border: #2e2a24;
  --border-strong: #3e3930;
  --accent: #d4663a;
  --accent-hover: #e07a4e;
  --accent-soft: rgb(212 102 58 / 0.12);
  --accent-fg: #1a1814;
  --success: #5cb96a;
  --warning: #d49a3a;
  --danger: #d4665a;
  --info: #5a9ab8;
  --selection: rgb(212 102 58 / 0.25);
  --quote-mark: #3e3930;
  --shadow-1: 0 1px 2px rgb(0 0 0 / 0.3);
  --shadow-2: 0 4px 16px rgb(0 0 0 / 0.4);
  --shadow-3: 0 12px 40px rgb(0 0 0 / 0.5);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  font-size: var(--fs-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--s-4));
}
body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: var(--lh-base);
  color: var(--fg);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

::selection { background: var(--selection); color: var(--fg); }
img, svg, video, canvas { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
button { font: inherit; cursor: pointer; }

code, kbd, pre, samp { font-family: var(--font-mono); font-size: var(--fs-code); }
code {
  background: var(--bg-elev);
  padding: 0.15em 0.35em;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  font-size: 0.85em;
}
pre code { background: transparent; border: 0; padding: 0; font-size: inherit; }
kbd {
  display: inline-block;
  padding: 0.1em 0.4em;
  font-size: 0.78em;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  color: var(--fg-muted);
}

.skip-link {
  position: absolute; top: -100px; left: 0; z-index: 200;
  padding: var(--s-2) var(--s-4);
  background: var(--accent); color: var(--accent-fg);
  font-size: 0.85rem; font-weight: 500;
  border-radius: 0 0 var(--r-sm) 0;
}
.skip-link:focus { top: 0; }

.container { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 var(--s-6); }
.text-center { text-align: center; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; gap: var(--s-5);
  height: var(--header-h);
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-6);
}
.brand {
  display: inline-flex; align-items: center; gap: var(--s-2);
  color: var(--fg);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: var(--tracking-snug);
  flex: 0 0 auto;
}
.brand:hover { color: var(--fg); }
.brand-mark { color: var(--accent); display: inline-flex; }
.brand-text { font-weight: 600; }
.brand-sm .brand-text { font-size: 1rem; }

.primary-nav {
  display: flex; align-items: center; gap: var(--s-1);
  margin-left: auto;
}
.nav-link {
  padding: 0.4rem 0.8rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--fg-muted);
  border-radius: var(--r-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--fg); }
.nav-link.is-active { color: var(--accent); }

.header-actions { display: flex; align-items: center; gap: var(--s-1); flex: 0 0 auto; }
.search-button {
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  transition: all var(--transition);
}
.search-button:hover { color: var(--fg); border-color: var(--border-strong); background: var(--bg-elev); }
.search-button kbd { font-size: 0.68rem; padding: 0 0.3em; height: 1.2em; border: 1px solid var(--border); }
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: transparent; border: 1px solid transparent;
  border-radius: var(--r-sm);
  color: var(--fg-muted);
  transition: all var(--transition);
}
.theme-toggle:hover { background: var(--bg-elev); color: var(--fg); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: inline; }
.github-link {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  color: var(--fg-muted);
  border-radius: var(--r-sm);
  transition: all var(--transition);
}
.github-link:hover { color: var(--fg); background: var(--bg-elev); }
.nav-toggle { display: none; }

@media (max-width: 880px) {
  .primary-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: var(--s-4) var(--s-6);
    transform: translateY(-100%); opacity: 0; pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
    z-index: 40;
  }
  .primary-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-link { width: 100%; padding: 0.6rem 0.5rem; }
  .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 32px; height: 32px;
    background: transparent; border: 1px solid transparent;
    border-radius: var(--r-sm); color: var(--fg-muted);
  }
  .nav-toggle:hover { color: var(--fg); background: var(--bg-elev); }
  .search-button span { display: none; }
  .search-button kbd { display: none; }
}

/* ---------- layout ---------- */
.layout { flex: 1; display: flex; }
.main { flex: 1; min-width: 0; }

@media (min-width: 1024px) {
  .layout.has-sidebar { display: grid; grid-template-columns: 240px 1fr; }
}

/* ---------- sidebar ---------- */
.sidebar {
  display: none;
  border-right: 1px solid var(--border);
  padding: var(--s-6) var(--s-4) var(--s-8);
  font-size: 0.9rem;
}
@media (min-width: 1024px) { .sidebar { display: block; } }
.sidebar-nav { display: flex; flex-direction: column; gap: var(--s-1); }
.sidebar-group { display: flex; flex-direction: column; }
.sidebar-link {
  display: block; padding: 0.35rem var(--s-3);
  color: var(--fg-muted);
  border-radius: var(--r-sm);
  font-weight: 500;
  font-size: 0.88rem;
  transition: color var(--transition), background var(--transition);
}
.sidebar-link:hover { color: var(--fg); background: var(--bg-elev); }
.sidebar-group.is-active .sidebar-link { color: var(--accent); font-weight: 600; }
.sidebar-subnav { list-style: none; padding: 0 0 0 var(--s-4); margin: 0; }
.sidebar-subnav { padding: var(--s-1) 0 var(--s-1) var(--s-4); }
.sidebar-subnav li a {
  display: block; padding: 0.25rem var(--s-3);
  font-size: 0.82rem; color: var(--fg-muted);
  border-radius: var(--r-sm);
  transition: color var(--transition);
}
.sidebar-subnav li a:hover { color: var(--fg); }

/* ---------- page chrome ---------- */
.page { padding: var(--s-8) 0 var(--s-9); }
.page-header { margin-bottom: var(--s-7); }
.page-breadcrumb { display: flex; gap: var(--s-2); color: var(--fg-faint); font-size: 0.82rem; margin-bottom: var(--s-3); }
.page-breadcrumb a { color: var(--fg-faint); }
.page-breadcrumb a:hover { color: var(--fg); }
.bc-sep { color: var(--fg-faint); }
.page-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-tight);
  margin: 0 0 var(--s-3);
  color: var(--fg);
}
.page-description {
  font-size: 1.15rem;
  color: var(--fg-muted);
  line-height: 1.5;
  max-width: var(--max-wide);
  margin: 0;
}

.page-body { display: grid; grid-template-columns: 1fr; gap: var(--s-7); }
@media (min-width: 1100px) {
  .page-body { grid-template-columns: 1fr 200px; }
}
.page-content { max-width: var(--max-w-prose); }
.page-content > * + * { margin-top: 1.2em; }
.page-content h2 { font-size: 1.6rem; font-weight: 700; margin-top: 2.2em; letter-spacing: var(--tracking-snug); }
.page-content h3 { font-size: 1.25rem; font-weight: 600; margin-top: 1.8em; }
.page-content h4 { font-size: 1.05rem; font-weight: 600; margin-top: 1.4em; }
.page-content p { line-height: 1.7; }
.page-content ul, .page-content ol { padding-left: 1.4em; }
.page-content li { margin: 0.3em 0; }
.page-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.2em 0 0.2em var(--s-5);
  margin: 1.5em 0;
  color: var(--fg-muted);
  font-style: italic;
}
.page-content table { width: 100%; border-collapse: collapse; margin: 1.5em 0; font-size: 0.92rem; }
.page-content th, .page-content td { padding: 0.55em 0.8em; text-align: left; border-bottom: 1px solid var(--border); }
.page-content th { background: var(--bg-elev); font-weight: 600; font-size: 0.85rem; }
.page-content a { text-underline-offset: 0.18em; text-decoration: underline; text-decoration-thickness: 1px; text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.page-content a:hover { text-decoration-color: var(--accent); }

.page-toc {
  font-size: 0.82rem;
  align-self: start;
  position: sticky;
  top: calc(var(--header-h) + var(--s-5));
}
.page-toc h2 { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: var(--tracking-wide); color: var(--fg-faint); margin: 0 0 var(--s-3); }
.page-toc nav { color: var(--fg-muted); }
.page-toc nav ul { list-style: none; padding: 0; margin: 0; }
.page-toc nav ul ul { padding-left: var(--s-4); }
.page-toc nav a { color: var(--fg-muted); display: block; padding: 0.2rem 0; }
.page-toc nav a:hover { color: var(--fg); }

@media (max-width: 880px) {
  .nav-toggle { display: inline-flex !important; }
  .page { padding: var(--s-5) 0 var(--s-7); }
}

/* ---------- sections ---------- */
.section { padding: var(--s-9) 0; }
.section-soft { background: var(--bg-elev); }
.section-sunken { background: var(--bg-sunken); }
.section-head h2 { font-family: var(--font-serif); font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 600; letter-spacing: var(--tracking-tight); margin: 0 0 var(--s-2); line-height: var(--lh-tight); }
.section-head p { color: var(--fg-muted); font-size: 1.1rem; margin: 0; max-width: 60ch; }
.section-sub { color: var(--fg-muted); font-size: 1.05rem; margin: 0; }
.lede { font-size: 1.2rem; color: var(--fg-muted); max-width: 60ch; line-height: 1.6; }

/* ---------- hero ---------- */
.hero {
  padding: var(--s-10) 0 var(--s-9);
  border-bottom: 1px solid var(--border);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-8);
  align-items: start;
}
@media (min-width: 900px) {
  .hero-grid { grid-template-columns: 1.4fr 1fr; gap: var(--s-9); }
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-size: 0.8rem; color: var(--fg-faint);
  text-transform: uppercase; letter-spacing: var(--tracking-wide);
  font-weight: 600;
  margin-bottom: var(--s-5);
}
.hero-tag {
  padding: 0.15em 0.5em;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--r-sm);
  font-weight: 500;
  font-size: 0.78rem;
  text-transform: none;
  letter-spacing: 0;
}
.hero-divider { color: var(--fg-faint); }

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 0 0 var(--s-5);
  color: var(--fg);
}
.hero-accent { color: var(--accent); }
.hero-sub {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  color: var(--fg-muted);
  max-width: 52ch;
  margin: 0 0 var(--s-6);
  line-height: 1.55;
}
.hero-sub strong { color: var(--fg); font-weight: 600; }
.hero-ctas {
  display: flex; flex-wrap: wrap; gap: var(--s-3);
  margin-bottom: var(--s-7);
}

.hero-code {
  background: var(--bg-code);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-2);
  font-size: 0.82rem;
  line-height: 1.6;
}
.hero-code-header {
  display: flex; align-items: center; gap: var(--s-2);
  padding: 0.5em 0.9em;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 0.72rem; color: rgba(255,255,255,0.45);
  font-family: var(--font-mono);
}
.hero-code pre {
  margin: 0; padding: 1em 1.2em;
  color: #e8e4dc;
  font-family: var(--font-mono);
  overflow-x: auto;
}
.hero-code .c-key { color: #d4a06a; }
.hero-code .c-str { color: #8ab070; }
.hero-code .c-id { color: #d4663a; }
.hero-code .c-mut { color: #9ca3af; }
.hero-code .c-ok { color: #8ab070; }
.hero-code .c-err { color: #d4665a; }

/* ---------- hero export card (rendered output, not source) ---------- */
.hero-aside-note {
  margin-top: var(--s-6);
}
.hero-aside-note-label {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--fg-faint);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--s-3);
}
.hero-aside-note-label::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.hero-card {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-elev) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-xl);
  padding: var(--s-5);
  box-shadow:
    0 1px 2px rgb(60 40 20 / 0.04),
    0 10px 32px rgb(60 40 20 / 0.10),
    inset 0 1px 0 rgb(255 255 255 / 0.40);
  position: relative;
}
[data-theme="dark"] .hero-card {
  box-shadow:
    0 1px 2px rgb(0 0 0 / 0.25),
    0 10px 32px rgb(0 0 0 / 0.30),
    inset 0 1px 0 rgb(255 255 255 / 0.06);
}
.hero-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--s-4);
  padding-bottom: var(--s-3);
  border-bottom: 1px solid var(--border);
}
.hero-card-id {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.01em;
}
.hero-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25em 0.7em 0.25em 0.5em;
  border-radius: 999px;
  font-family: var(--font-mono);
  border: 1px solid transparent;
  line-height: 1.4;
}
.hero-card-badge-ok {
  background: color-mix(in srgb, var(--success) 15%, transparent);
  color: var(--success);
  border-color: color-mix(in srgb, var(--success) 30%, transparent);
}
.hero-card-badge-ok::before {
  content: "✓";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.1em;
  height: 1.1em;
  border-radius: 50%;
  background: var(--success);
  color: var(--fg-inverse);
  font-size: 0.6em;
  font-weight: 700;
  line-height: 1;
}
.hero-card-trace {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: 0.6em 0;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--border);
}
.hero-card-trace:last-child {
  border-bottom: 0;
}
.hero-card-trace-label {
  color: var(--fg-faint);
  font-size: 0.75rem;
  flex: 0 0 auto;
  width: 84px;
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
}
.hero-card-trace-label::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.5;
}
.hero-card-trace-ref {
  font-family: var(--font-mono);
  color: var(--fg);
  font-weight: 600;
  font-size: 0.82rem;
  padding: 0.15em 0.5em;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}
.hero-card-trace-pin {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.05em 0.35em;
  margin-left: 0.35em;
  border-radius: var(--r-sm);
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  vertical-align: middle;
  line-height: 1.4;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: 0.6rem 1.1rem;
  border-radius: var(--r-sm);
  font-size: 0.92rem; font-weight: 500;
  text-decoration: none;
  transition: all var(--transition);
  border: 1px solid transparent;
  line-height: 1.2;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: var(--accent-hover); color: var(--accent-fg); }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--bg-elev); border-color: var(--border-strong); }
.btn-link { background: transparent; color: var(--fg-muted); padding: 0.5rem 0.75rem; }
.btn-link:hover { color: var(--fg); }
.btn-lg { padding: 0.8rem 1.4rem; font-size: 1rem; }

/* ---------- terminal ---------- */
.terminal { background: var(--bg-code); border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow-2); }
.terminal-chrome {
  display: flex; align-items: center; gap: var(--s-2);
  padding: 0.5em 1em;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-dot-red { background: #ff5f57; }
.terminal-dot-yellow { background: #ffbd2e; }
.terminal-dot-green { background: #28c840; }
.terminal-title { margin-left: var(--s-3); font-size: 0.72rem; color: rgba(255,255,255,0.45); font-family: var(--font-mono); }
.terminal-body { margin: 0; padding: 1em 1.2em; color: #e8e4dc; font-size: 0.82rem; line-height: 1.55; overflow-x: auto; }
.terminal-body .prompt { color: #d4663a; user-select: none; margin-right: 0.5ch; }
.terminal-body .ok { color: #8ab070; }
.terminal-body .err { color: #d4665a; }
.terminal-body .warn { color: #d49a3a; }
.terminal-body .muted { color: #9ca3af; }
.terminal-body .exit { color: #7a756c; }

/* ---------- features grid ---------- */
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--s-5);
}
.feature {
  padding: var(--s-5) var(--s-5) var(--s-4);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg);
  transition: border-color var(--transition);
}
.feature:hover { border-color: var(--border-strong); }
.feature-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: var(--accent-soft); color: var(--accent);
  border-radius: var(--r-sm);
  margin-bottom: var(--s-3);
}
.feature h3 { font-size: 1rem; font-weight: 600; margin: 0 0 var(--s-2); }
.feature p { color: var(--fg-muted); margin: 0; font-size: 0.9rem; line-height: 1.6; }

/* ---------- why grid ---------- */
.why-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--s-6);
}
.why-card { padding: var(--s-6); background: var(--bg); border-radius: var(--r-md); border: 1px solid var(--border); }
.why-card h3 { font-size: 1.1rem; font-weight: 600; margin: 0 0 var(--s-3); }
.why-card p { color: var(--fg-muted); margin: 0 0 var(--s-3); font-size: 0.95rem; line-height: 1.6; }
.why-card a { font-size: 0.9rem; }

/* ---------- stat tiles ---------- */
.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--s-4);
}
.stat-tile {
  display: flex; flex-direction: column;
  padding: var(--s-5);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  text-decoration: none;
  transition: border-color var(--transition);
}
.stat-tile:hover { border-color: var(--accent); text-decoration: none; }
.stat-value {
  font-size: 2.2rem; font-weight: 700;
  letter-spacing: -0.02em; color: var(--fg);
  font-feature-settings: "tnum";
  line-height: 1;
}
.stat-label { font-size: 0.88rem; color: var(--fg-muted); margin-top: var(--s-2); }
.stat-detail { font-size: 0.78rem; color: var(--fg-faint); margin-top: var(--s-1); }

/* ---------- callout ---------- */
.callout {
  display: flex; gap: var(--s-3);
  padding: var(--s-4) var(--s-5);
  border-radius: var(--r-sm);
  border-left: 3px solid var(--info);
  background: color-mix(in srgb, var(--info) 7%, var(--bg-elev));
  margin: 1em 0;
  font-size: 0.92rem;
}
.callout-warning { border-left-color: var(--warning); background: color-mix(in srgb, var(--warning) 7%, var(--bg-elev)); }
.callout-danger { border-left-color: var(--danger); background: color-mix(in srgb, var(--danger) 7%, var(--bg-elev)); }
.callout-success { border-left-color: var(--success); background: color-mix(in srgb, var(--success) 7%, var(--bg-elev)); }
.callout-icon { flex: 0 0 18px; color: currentColor; }
.callout-body { flex: 1; color: var(--fg); }
.callout-body > *:first-child { margin-top: 0; }
.callout-body > *:last-child { margin-bottom: 0; }

/* ---------- badge ---------- */
.badge {
  display: inline-flex; align-items: center;
  padding: 0.12em 0.5em;
  font-size: 0.76rem; font-weight: 500;
  border-radius: var(--r-sm);
  background: var(--bg-elev); color: var(--fg-muted);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
}
.badge-success { background: color-mix(in srgb, var(--success) 12%, transparent); color: var(--success); border-color: transparent; }
.badge-warning { background: color-mix(in srgb, var(--warning) 12%, transparent); color: var(--warning); border-color: transparent; }
.badge-danger  { background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--danger); border-color: transparent; }
.badge-info    { background: color-mix(in srgb, var(--info) 12%, transparent); color: var(--info); border-color: transparent; }
.badge-accent  { background: var(--accent-soft); color: var(--accent); border-color: transparent; }

/* ---------- code blocks (chroma) ---------- */
.codeblock-wrapper {
  margin: 1.2em 0;
  border-radius: var(--r-sm);
  background: var(--bg-code);
  border: 1px solid var(--border);
  overflow: hidden;
}
.codeblock-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.4em 0.9em;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 0.74rem;
  color: rgba(255,255,255,0.45);
}
.codeblock-lang { font-family: var(--font-mono); text-transform: lowercase; }
.codeblock-copy {
  display: inline-flex; align-items: center; gap: 0.3em;
  background: transparent; border: 0; padding: 0.2em 0.5em;
  color: rgba(255,255,255,0.45); font-size: 0.74rem;
  border-radius: var(--r-sm);
  transition: color var(--transition), background var(--transition);
}
.codeblock-copy:hover { color: #fff; background: rgba(255,255,255,0.06); }
.codeblock-copy.is-copied { color: #8ab070; }
.codeblock-wrapper pre {
  margin: 0; padding: 0.9em 1.1em;
  background: transparent; color: #e8e4dc;
  font-size: 0.82rem; line-height: 1.55;
  overflow-x: auto;
}
.code-block {
  background: var(--bg-code); color: #e8e4dc;
  border-radius: var(--r-sm); padding: 1em 1.2em;
  font-size: 0.82rem; line-height: 1.55;
  overflow-x: auto;
  border: 1px solid var(--border);
  margin: 1em 0;
}
.code-block code { color: inherit; background: transparent; border: 0; padding: 0; }

/* chroma colors (warm-tinted, paired with bg-code) */
.chroma, .chroma * { color: #e8e4dc; background: transparent; }
.chroma .k, .chroma .kc, .chroma .kd, .chroma .kn, .chroma .kp, .chroma .kr, .chroma .kt { color: #d4a06a; }
.chroma .s, .chroma .s1, .chroma .s2, .chroma .sb, .chroma .sc, .chroma .sd, .chroma .se, .chroma .sh, .chroma .si, .chroma .sr, .chroma .ss { color: #8ab070; }
.chroma .nb, .chroma .nf, .chroma .nc, .chroma .no, .chroma .nd, .chroma .ni, .chroma .ne, .chroma .nl, .chroma .nn, .chroma .nx, .chroma .py, .chroma .nt, .chroma .nv, .chroma .vc, .chroma .vg, .chroma .vi { color: #c4a882; }
.chroma .nb { color: #b89870; }
.chroma .c, .chroma .c1, .chroma .cm, .chroma .cp, .chroma .cs { color: #7a756c; font-style: italic; }
.chroma .m, .chroma .mb, .chroma .mf, .chroma .mh, .chroma .mi, .chroma .mo { color: #b89870; }
.chroma .o, .chroma .ow { color: #d4a06a; }
.chroma .err { color: #d4665a; }
.chroma .gd { color: #d4665a; }
.chroma .gi { color: #8ab070; }
.chroma .gs { font-weight: bold; }
.chroma .ge { font-style: italic; }
.chroma .gh, .chroma .go, .chroma .gp, .chroma .gu, .chroma .gt { color: #b89870; }
.chroma .l, .chroma .ld { color: #8ab070; }
.chroma .na { color: #8ab070; }

/* ---------- headings with permalinks ---------- */
.heading-anchor {
  margin-left: 0.4em;
  color: var(--fg-faint);
  text-decoration: none;
  opacity: 0;
  transition: opacity var(--transition);
  font-weight: 400;
}
h1:hover .heading-anchor, h2:hover .heading-anchor, h3:hover .heading-anchor, h4:hover .heading-anchor, h5:hover .heading-anchor, h6:hover .heading-anchor { opacity: 1; }
.heading-anchor:hover { color: var(--accent); }

/* ---------- ASPICE tables ---------- */
.aspice-table { margin: 1.5em 0; padding: var(--s-5); border: 1px solid var(--border); border-radius: var(--r-md); background: var(--bg); }
.aspice-table-head h3 { margin: 0 0 var(--s-2); }
.aspice-table-head p { color: var(--fg-muted); margin: 0 0 var(--s-4); }
.aspice-table-grid {
  display: grid; gap: var(--s-3);
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.aspice-bp {
  padding: var(--s-3) var(--s-4);
  background: var(--bg-elev);
  border-radius: var(--r-sm);
  border-left: 3px solid var(--accent);
}
.aspice-bp-id { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); font-weight: 600; }
.aspice-bp-title { color: var(--fg); margin-top: var(--s-1); font-size: 0.92rem; }
.aspice-bp-note { color: var(--fg-muted); font-size: 0.82rem; margin-top: var(--s-2); }

/* ---------- search modal ---------- */
.search-modal {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 12vh;
}
.search-modal[hidden] { display: none; }
.search-backdrop {
  position: absolute; inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.search-panel {
  position: relative;
  width: 100%; max-width: 600px; max-height: 70vh;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-3);
  overflow: hidden;
  display: flex; flex-direction: column;
  margin: 0 var(--s-4);
  animation: search-in 160ms ease;
}
@keyframes search-in {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
.search-input-wrap {
  display: flex; align-items: center; gap: var(--s-3);
  padding: var(--s-4) var(--s-5);
  border-bottom: 1px solid var(--border);
}
.search-icon { color: var(--fg-faint); flex: 0 0 16px; }
.search-input {
  flex: 1; background: transparent; border: 0; outline: 0;
  color: var(--fg); font-size: 1rem; font-family: inherit;
  padding: 0.2em 0;
}
.search-input::placeholder { color: var(--fg-faint); }
.search-esc { flex: 0 0 auto; }
.search-results { flex: 1; overflow-y: auto; padding: var(--s-2) 0; }
.search-result {
  display: block; padding: var(--s-3) var(--s-5);
  color: var(--fg);
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: background var(--transition);
}
.search-result:hover, .search-result.is-focused { background: var(--bg-elev); border-left-color: var(--accent); text-decoration: none; }
.search-result-title { font-weight: 500; color: var(--fg); }
.search-result-section { font-size: 0.74rem; color: var(--accent); text-transform: uppercase; letter-spacing: var(--tracking-wide); margin-bottom: 2px; }
.search-result-summary { font-size: 0.85rem; color: var(--fg-muted); margin-top: 2px; line-height: 1.4; }
.search-result mark { background: color-mix(in srgb, var(--accent) 22%, transparent); color: var(--fg); padding: 0 0.1em; border-radius: 2px; }
.search-empty { padding: var(--s-6); text-align: center; color: var(--fg-muted); }
.search-foot {
  display: flex; align-items: center; gap: var(--s-4);
  padding: var(--s-2) var(--s-5);
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  font-size: 0.74rem; color: var(--fg-muted);
}
.search-foot-spacer { flex: 1; }
.search-count { padding: var(--s-2) var(--s-5); font-size: 0.74rem; color: var(--fg-muted); text-transform: uppercase; letter-spacing: var(--tracking-wide); border-bottom: 1px solid var(--border); }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-sunken);
  padding: var(--s-8) 0 var(--s-5);
  margin-top: var(--s-9);
}
.footer-inner {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--s-7);
  margin-bottom: var(--s-6);
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-6);
}
@media (max-width: 720px) { .footer-inner { grid-template-columns: 1fr 1fr; } }
.footer-tag { color: var(--fg-muted); font-size: 0.88rem; margin: var(--s-2) 0 0; max-width: 40ch; }
.footer-col h4 { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: var(--tracking-wide); color: var(--fg-faint); margin: 0 0 var(--s-3); }
.footer-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--s-2); }
.footer-list a { color: var(--fg-muted); font-size: 0.88rem; }
.footer-list a:hover { color: var(--accent); }
.footer-list .muted { color: var(--fg-faint); font-size: 0.82rem; }
.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--s-4) var(--s-6) 0;
  border-top: 1px solid var(--border);
  font-size: 0.82rem; color: var(--fg-faint);
  display: flex; justify-content: space-between;
}

/* ---------- use case cards ---------- */
.usecase-grid {
  display: grid; gap: var(--s-4);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin: 1.5em 0;
}
.usecase {
  padding: var(--s-5);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: border-color var(--transition);
}
.usecase:hover { border-color: var(--border-strong); }
.usecase h3 { font-size: 1rem; margin: 0 0 var(--s-2); }
.usecase p { color: var(--fg-muted); margin: 0 0 var(--s-3); font-size: 0.9rem; line-height: 1.6; }
.usecase a { font-size: 0.85rem; }

/* ---------- FAQ ---------- */
.faq { display: flex; flex-direction: column; gap: var(--s-3); margin: 1.5em 0; }
.faq details {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq details[open] { border-color: var(--border-strong); }
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: var(--s-4) var(--s-5);
  font-weight: 500;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-3);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--fg-faint);
  transition: transform var(--transition);
  flex: 0 0 auto;
  line-height: 1;
}
.faq details[open] summary::after { content: "\2212"; }
.faq summary:hover { background: var(--bg-elev); }
.faq .faq-body { padding: 0 var(--s-5) var(--s-5); color: var(--fg-muted); }
.faq .faq-body p:first-child { margin-top: 0; }
.faq .faq-body p:last-child { margin-bottom: 0; }
.faq .faq-body code { font-size: 0.85em; }
.faq h2 { font-size: 0.72rem; margin: 2em 0 var(--s-3); color: var(--fg-faint); text-transform: uppercase; letter-spacing: var(--tracking-wide); font-weight: 600; }

/* ---------- grid 2 ---------- */
.grid-2 { display: grid; gap: var(--s-7); grid-template-columns: 1fr; }
@media (min-width: 800px) { .grid-2 { grid-template-columns: 1fr 1fr; } }

/* ---------- stat strip ---------- */
.stat-strip { display: flex; flex-wrap: wrap; gap: var(--s-6); padding: var(--s-5) var(--s-6); background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--r-sm); margin: 1.5em 0; }
.stat-strip-item { display: flex; flex-direction: column; }
.stat-strip-value { font-size: 1.5rem; font-weight: 700; color: var(--fg); font-feature-settings: "tnum"; }
.stat-strip-label { font-size: 0.82rem; color: var(--fg-muted); }

/* ---------- list of pages ---------- */
.page-list-items { list-style: none; padding: 0; margin: 1.5em 0; display: flex; flex-direction: column; gap: var(--s-3); }
.page-list-items li { padding: var(--s-4) var(--s-5); border: 1px solid var(--border); border-radius: var(--r-sm); transition: border-color var(--transition); }
.page-list-items li:hover { border-color: var(--border-strong); }
.page-list-items a { font-weight: 600; font-size: 1.02rem; color: var(--fg); }
.page-list-items a:hover { color: var(--accent); }
.page-list-items p { color: var(--fg-muted); margin: var(--s-1) 0 0; font-size: 0.9rem; }

/* ---------- benchmark table ---------- */
.bench-table { width: 100%; border-collapse: collapse; margin: 1.5em 0; font-feature-settings: "tnum"; }
.bench-table th, .bench-table td { padding: 0.6em 0.9em; text-align: right; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.bench-table th:first-child, .bench-table td:first-child { text-align: left; }
.bench-table th { background: var(--bg-elev); color: var(--fg-muted); font-weight: 500; font-size: 0.78rem; text-transform: uppercase; letter-spacing: var(--tracking-wide); }
.bench-table tr:last-child td { border-bottom: 0; }
.bench-table tbody tr:hover { background: var(--bg-elev); }
.bench-table .num { font-family: var(--font-mono); }
.bench-table .num-best { color: var(--success); font-weight: 500; }

/* ---------- step nav ---------- */
.step-nav { display: flex; justify-content: space-between; margin-top: var(--s-8); padding-top: var(--s-5); border-top: 1px solid var(--border); font-size: 0.9rem; }
.step-nav a { color: var(--fg-muted); }
.step-nav a:hover { color: var(--accent); }
.step-nav .step-next { text-align: right; margin-left: auto; }
.step-nav .step-label { display: block; font-size: 0.72rem; color: var(--fg-faint); text-transform: uppercase; letter-spacing: var(--tracking-wide); }

/* ---------- mermaid ---------- */
.mermaid {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: var(--s-5);
  margin: 1.5em 0;
  text-align: center;
  overflow-x: auto;
}
.mermaid svg { max-width: 100%; height: auto; }

/* ---------- editorial components (home page) ---------- */
.intro-section { padding: var(--s-9) 0; border-bottom: 1px solid var(--border); }
.intro-grid {
  display: grid; grid-template-columns: 1fr; gap: var(--s-7);
}
@media (min-width: 800px) {
  .intro-grid { grid-template-columns: 1fr 2fr; gap: var(--s-8); }
}
.intro-eyebrow {
  font-size: 0.72rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: var(--tracking-wide);
  color: var(--accent);
}
.intro-body p { font-size: 1.1rem; line-height: 1.65; color: var(--fg); }
.intro-body p + p { margin-top: 1em; }

.steps-section { padding: var(--s-9) 0; background: var(--bg-elev); }
.steps-list { display: flex; flex-direction: column; gap: 0; max-width: var(--max-w-wide); margin: 0 auto; }
.step-item {
  display: grid; grid-template-columns: 48px 1fr; gap: var(--s-5);
  padding: var(--s-6) 0;
  border-bottom: 1px solid var(--border);
}
.step-item:last-child { border-bottom: 0; }
.step-number {
  font-size: 2.5rem; font-weight: 700;
  color: var(--accent);
  line-height: 1;
  font-feature-settings: "tnum";
  letter-spacing: -0.02em;
}
.step-content h3 { font-family: var(--font-serif); font-size: 1.3rem; font-weight: 600; margin: 0.3em 0 var(--s-2); }
.step-content p { color: var(--fg-muted); margin: 0; font-size: 0.98rem; line-height: 1.6; max-width: 60ch; }
.step-content a { font-size: 0.88rem; margin-top: var(--s-2); display: inline-block; }

.scenarios-section { padding: var(--s-9) 0; border-bottom: 1px solid var(--border); }
.scenario {
  padding: var(--s-7) 0;
  border-bottom: 1px solid var(--border);
}
.scenario:last-child { border-bottom: 0; }
.scenario-header {
  display: flex; align-items: baseline; gap: var(--s-4);
  margin-bottom: var(--s-3);
}
.scenario-tag {
  font-size: 0.72rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: var(--tracking-wide);
  color: var(--accent);
  flex: 0 0 auto;
}
.scenario h3 { font-family: var(--font-serif); font-size: 1.4rem; font-weight: 600; margin: 0; }
.scenario p { color: var(--fg-muted); font-size: 1rem; line-height: 1.65; max-width: 64ch; margin: 0 0 var(--s-3); }
.scenario a { font-size: 0.88rem; }

.bigstat-section { padding: var(--s-10) 0; background: var(--bg-sunken); }
.bigstat {
  display: grid; grid-template-columns: 1fr; gap: var(--s-5);
  align-items: center;
}
@media (min-width: 700px) {
  .bigstat { grid-template-columns: auto 1fr; gap: var(--s-8); }
}
.bigstat-number {
  font-size: clamp(3.5rem, 8vw, 5.5rem);
  font-weight: 700;
  color: var(--accent);
  line-height: 0.9;
  letter-spacing: -0.04em;
  font-feature-settings: "tnum";
}
.bigstat-body { max-width: 52ch; }
.bigstat-body p { font-size: 1.15rem; color: var(--fg-muted); line-height: 1.55; margin: 0; }
.bigstat-body a { font-size: 0.92rem; margin-top: var(--s-3); display: inline-block; }

.cta-section { padding: var(--s-10) 0; text-align: center; border-top: 1px solid var(--border); }
.cta-section h2 { font-family: var(--font-serif); font-size: clamp(1.8rem, 3.5vw, 2.6rem); font-weight: 600; letter-spacing: var(--tracking-tight); margin: 0 0 var(--s-3); }
.cta-section p { color: var(--fg-muted); font-size: 1.1rem; margin: 0 0 var(--s-5); }

/* ---------- benchmark bar chart ---------- */
.bench-bars {
  display: flex; flex-direction: column; gap: var(--s-4);
  margin: 2em 0; padding: var(--s-6);
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.bench-bar-row { display: flex; align-items: center; gap: var(--s-4); }
.bench-bar-label {
  flex: 0 0 140px; font-size: 0.88rem; color: var(--fg-muted);
  font-feature-settings: "tnum"; text-align: right;
}
.bench-bar-track {
  flex: 1; display: flex; align-items: center; gap: var(--s-3);
  height: 32px; position: relative;
}
.bench-bar-fill {
  height: 100%; border-radius: var(--r-sm);
  background: var(--accent);
  width: var(--w);
  min-width: 4px;
  transition: width 600ms ease;
  opacity: 0.85;
}
.bench-bar-value {
  font-size: 0.92rem; font-weight: 600; color: var(--fg);
  font-feature-settings: "tnum"; white-space: nowrap;
}
@media (max-width: 600px) {
  .bench-bar-label { flex: 0 0 100px; font-size: 0.8rem; }
  .bench-bar-value { font-size: 0.85rem; }
}

/* ---------- focus ring ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}
.search-button:focus-visible, .theme-toggle:focus-visible, .github-link:focus-visible { outline-offset: 1px; }

/* ---------- print ---------- */
@media print {
  .site-header, .sidebar, .page-toc, .search-modal, .theme-toggle, .nav-toggle, .github-link, .header-actions, .codeblock-copy, .search-button { display: none !important; }
  body { background: #fff !important; color: #000 !important; }
  a { text-decoration: underline; color: #000; }
  .page { padding: 0; }
  pre, code { border: 1px solid #ccc !important; background: #f5f5f5 !important; color: #000 !important; }
}