/* aiagentinterviews.com — one stylesheet for every page. Tokens first, then layout, then components. */

:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --surface-2: #f2f1ed;
  --ink: #111214;
  --ink-2: #3f4147;
  --ink-3: #62656d;
  --line: #e3e1db;
  --line-2: #d3d0c8;
  --accent: #e8560f;
  --accent-text: #b33c08;
  --accent-soft: #fdeee5;
  --ok: #157f4a;
  --btn-bg: #111214;
  --btn-ink: #ffffff;

  /* the trace band stays dark in both themes */
  --band: #0d0e11;
  --band-2: #16181c;
  --band-line: #2a2c32;
  --band-ink: #eeece6;
  --band-ink-2: #a3a19b;
  --band-accent: #ff8a4a;
  --band-ok: #5fd39a;
  --band-blue: #8fb8ff;

  --font-display: "Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --wrap: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 14px;
  --radius-sm: 9px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0c0e;
    --surface: #131417;
    --surface-2: #1a1b1f;
    --ink: #f1efe9;
    --ink-2: #c4c2bb;
    --ink-3: #96948e;
    --line: #26282d;
    --line-2: #34363c;
    --accent: #ff7a33;
    --accent-text: #ff9a62;
    --accent-soft: #2a1a10;
    --ok: #5fd39a;
    --btn-bg: #f1efe9;
    --btn-ink: #0b0c0e;
    --band: #111317;
    --band-2: #181a1f;
    color-scheme: dark;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; }
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: var(--accent); color: #fff; }

.skip {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--btn-bg);
  color: var(--btn-ink);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
}
.skip:focus { top: 12px; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand svg { width: 30px; height: 30px; flex: none; }
.brand b { color: var(--accent-text); font-weight: 700; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  padding: 8px 12px;
  border-radius: 8px;
}
.nav a:hover { color: var(--ink); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--surface-2); }

.menu { display: none; position: relative; }
.menu summary {
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  padding: 8px 14px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
}
.menu summary::-webkit-details-marker { display: none; }
.menu nav {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  display: grid;
  min-width: 240px;
  padding: 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.14);
}
.menu nav a { padding: 11px 12px; border-radius: 8px; text-decoration: none; font-weight: 500; }
.menu nav a:hover { background: var(--surface-2); }

@media (max-width: 860px) {
  .nav { display: none; }
  .menu { display: block; }
}

/* ---------- type ---------- */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: -0.022em;
  line-height: 1.08;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(40px, 6.4vw, 76px); font-weight: 700; letter-spacing: -0.035em; }
h2 { font-size: clamp(30px, 4vw, 46px); font-weight: 700; }
h3 { font-size: 21px; font-weight: 650; letter-spacing: -0.012em; line-height: 1.25; }
p { margin: 0; text-wrap: pretty; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-text);
}
.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.lead { font-size: clamp(18px, 1.6vw, 21px); line-height: 1.55; color: var(--ink-2); max-width: 62ch; }
.muted { color: var(--ink-3); }
.mono { font-family: var(--font-mono); }

/* ---------- buttons ---------- */

.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--btn-bg); color: var(--btn-ink); }
.btn-ghost { border-color: var(--line-2); background: var(--surface); }
.btn-ghost:hover { border-color: var(--ink-3); }
.btn .arr { transition: transform 0.15s ease; }
.btn:hover .arr { transform: translateX(3px); }

/* ---------- hero ---------- */

.hero { padding: clamp(48px, 8vw, 104px) 0 clamp(56px, 7vw, 96px); position: relative; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 70% 60% at 70% 30%, #000 10%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 70% 30%, #000 10%, transparent 75%);
  opacity: 0.55;
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
.hero h1 { margin: 22px 0 24px; }
.hero h1 em {
  font-style: normal;
  color: var(--accent-text);
}
.hero .lead { margin-bottom: 32px; }
.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14.5px;
  color: var(--ink-3);
}
.hero-points li { display: inline-flex; align-items: center; gap: 8px; }
.hero-points li::before { content: "✓"; color: var(--ok); font-weight: 700; }

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

/* ---------- trace card ---------- */

.trace {
  background: var(--band);
  color: var(--band-ink);
  border: 1px solid var(--band-line);
  border-radius: 18px;
  box-shadow: 0 30px 80px -20px rgba(17, 18, 20, 0.45), 0 0 0 6px color-mix(in srgb, var(--band) 6%, transparent);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  overflow: hidden;
}
.trace-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--band-line);
  background: var(--band-2);
  color: var(--band-ink-2);
  font-size: 12px;
}
.trace-dots { display: inline-flex; gap: 6px; }
.trace-dots i { width: 10px; height: 10px; border-radius: 50%; background: #3a3c42; display: block; }
.trace-live { display: inline-flex; align-items: center; gap: 7px; color: var(--band-ok); }
.trace-live::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--band-ok);
  animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: 0.25; } }

.trace ol { list-style: none; margin: 0; padding: 14px 0; }
.trace li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 10px;
  padding: 5px 16px;
  opacity: 0;
  transform: translateY(4px);
  animation: step 0.45s ease forwards;
}
.trace li:nth-child(1) { animation-delay: 0.15s; }
.trace li:nth-child(2) { animation-delay: 0.55s; }
.trace li:nth-child(3) { animation-delay: 0.95s; }
.trace li:nth-child(4) { animation-delay: 1.35s; }
.trace li:nth-child(5) { animation-delay: 1.75s; }
.trace li:nth-child(6) { animation-delay: 2.15s; }
.trace li:nth-child(7) { animation-delay: 2.55s; }
.trace li:nth-child(8) { animation-delay: 2.95s; }
@keyframes step { to { opacity: 1; transform: none; } }

.trace .k { color: var(--band-ink-2); }
.trace .k.tool { color: var(--band-accent); }
.trace .k.obs { color: var(--band-blue); }
.trace .k.ok { color: var(--band-ok); }
.trace .v { overflow-wrap: anywhere; }
.trace .v small { display: block; color: var(--band-ink-2); font-size: 12px; }
.trace .arg { color: #f3d28b; }
.trace-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  padding: 12px 16px;
  border-top: 1px solid var(--band-line);
  color: var(--band-ink-2);
  font-size: 12px;
}
.trace-foot b { color: var(--band-ink); font-weight: 500; }
@media (max-width: 520px) { .trace-dots { display: none; } .trace li { grid-template-columns: 54px minmax(0, 1fr); } }
.trace-caption { margin-top: 12px; font-size: 13px; color: var(--ink-3); text-align: center; }

@media (prefers-reduced-motion: reduce) {
  .trace li { animation: none; opacity: 1; transform: none; }
  .trace-live::before { animation: none; }
  .btn, .btn .arr { transition: none; }
}

/* ---------- sections ---------- */

section { padding: clamp(56px, 8vw, 104px) 0; }
.section-alt { background: var(--surface-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { display: grid; gap: 16px; max-width: 760px; margin-bottom: clamp(32px, 4vw, 52px); }
.section-head .lead { font-size: 18.5px; }

.strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
  background: var(--surface);
}
.strip ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 34px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}

/* topic grid */
.topics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.topic {
  position: relative;
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 26px 24px 28px;
  background: var(--surface);
}
.topic .n { font-family: var(--font-mono); font-size: 12.5px; color: var(--accent-text); }
.topic p { color: var(--ink-2); font-size: 15.5px; line-height: 1.55; }
.topic ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
}
.topic li {
  font-size: 12.5px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--ink-2);
  border: 1px solid var(--line);
}
@media (max-width: 960px) { .topics { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .topics { grid-template-columns: 1fr; } }

/* worked question */
.worked {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}
.worked-q {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 18px;
}
.qcard {
  padding: 26px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
}
.qcard .meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 9px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--ink-2);
}
.tag.hot { background: var(--accent-soft); color: var(--accent-text); border-color: transparent; }
.qcard blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -0.015em;
}
.answer { display: grid; gap: 20px; }
.answer h3 { font-size: 19px; }
.answer p, .answer li { color: var(--ink-2); }
.answer ol, .answer ul { margin: 0; padding-left: 22px; display: grid; gap: 8px; }
.grades { display: grid; gap: 10px; }
.grade {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 15.5px;
}
.grade b { font-family: var(--font-mono); font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.06em; padding-top: 2px; }
.grade.weak b { color: var(--ink-3); }
.grade.hire b { color: var(--accent-text); }
.grade.strong { border-color: color-mix(in srgb, var(--ok) 45%, var(--line)); }
.grade.strong b { color: var(--ok); }
@media (max-width: 860px) {
  .worked { grid-template-columns: 1fr; }
  .worked-q { position: static; }
  .grade { grid-template-columns: 1fr; gap: 4px; }
}

/* role cards */
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.card {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
}
.card p { color: var(--ink-2); font-size: 15.5px; }
a.card { text-decoration: none; transition: border-color 0.15s ease, transform 0.15s ease; }
a.card:hover { border-color: var(--ink-3); transform: translateY(-2px); }
a.card .more { margin-top: 6px; font-weight: 600; font-size: 15px; color: var(--accent-text); }
@media (max-width: 960px) { .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .cards { grid-template-columns: 1fr; } }

/* principles */
.principles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 56px; }
.principle { display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 16px; padding: 24px 0; border-top: 1px solid var(--line); }
.principle .n { font-family: var(--font-mono); font-size: 13px; color: var(--accent-text); padding-top: 3px; }
.principle p { color: var(--ink-2); margin-top: 8px; font-size: 15.5px; }
@media (max-width: 760px) { .principles { grid-template-columns: 1fr; } }

/* FAQ */
.faq { display: grid; gap: 10px; max-width: 860px; }
.faq details {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  font-weight: 600;
  font-size: 17px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--font-mono); color: var(--ink-3); font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq .a { padding: 0 20px 20px; color: var(--ink-2); display: grid; gap: 12px; }

/* CTA band */
.cta {
  background: var(--band);
  color: var(--band-ink);
  border-radius: 22px;
  padding: clamp(36px, 6vw, 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  gap: 32px;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.cta::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  border: 1px dashed color-mix(in srgb, var(--band-accent) 55%, transparent);
  pointer-events: none;
}
.cta h2 { color: var(--band-ink); }
.cta p { color: var(--band-ink-2); margin-top: 14px; font-size: 18px; }
.cta .actions { justify-content: flex-end; position: relative; z-index: 1; }
.cta .btn-primary { background: var(--band-ink); color: var(--band); }
.cta .btn-ghost { background: transparent; color: var(--band-ink); border-color: var(--band-line); }
@media (max-width: 860px) { .cta { grid-template-columns: 1fr; } .cta .actions { justify-content: flex-start; } }

/* ---------- inner pages ---------- */

.page-head { padding: clamp(40px, 6vw, 80px) 0 clamp(28px, 4vw, 48px); border-bottom: 1px solid var(--line); }
.page-head h1 { font-size: clamp(36px, 5.2vw, 62px); margin: 18px 0 20px; }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; font-size: 14px; color: var(--ink-3); }
.crumbs li + li::before { content: "/"; margin-right: 8px; color: var(--line-2); }
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--ink); text-decoration: underline; }
.updated { margin-top: 18px; font-size: 14px; color: var(--ink-3); font-family: var(--font-mono); }

.doc {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  padding-top: clamp(32px, 5vw, 56px);
  padding-bottom: clamp(56px, 8vw, 104px);
}
.toc { position: sticky; top: 92px; align-self: start; max-height: calc(100vh - 110px); overflow: auto; }
.toc p { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 12px; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; border-left: 1px solid var(--line); }
.toc a {
  display: block;
  padding: 6px 0 6px 14px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  text-decoration: none;
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.4;
}
.toc a:hover { color: var(--ink); border-left-color: var(--accent); }
@media (max-width: 960px) {
  .doc { grid-template-columns: 1fr; }
  .toc { position: static; max-height: none; }
  .toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); border-left: 0; gap: 0 16px; }
  .toc a { padding-left: 0; border-left: 0; }
}

.prose { max-width: 760px; }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { font-size: clamp(28px, 3.2vw, 36px); margin-top: 2.2em; padding-top: 0.2em; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin-top: 1.9em; font-size: 21px; }
.prose p, .prose li { color: var(--ink-2); }
.prose strong { color: var(--ink); }
.prose a { color: var(--accent-text); text-underline-offset: 3px; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li + li { margin-top: 0.45em; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.12em 0.4em;
  border-radius: 5px;
  background: var(--surface-2);
  border: 1px solid var(--line);
}
.prose pre {
  margin: 1.4em 0;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--band);
  color: var(--band-ink);
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  overflow-x: auto;
}
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; color: inherit; }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-3); font-weight: 500; }
.prose td { color: var(--ink-2); }
.prose figure { margin: 1.8em 0; }
.prose figcaption { margin-top: 10px; font-size: 14px; color: var(--ink-3); }

.callout {
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  color: var(--ink);
}
.callout p { color: var(--ink); }

/* question bank */
.qgroup { padding-top: 8px; }
.qgroup + .qgroup { margin-top: 56px; }
.qgroup > header { display: grid; gap: 8px; margin-bottom: 18px; }
.qgroup > header p { color: var(--ink-2); }
.qlist { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; counter-reset: q; }
.qitem {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}
.qitem h3 { font-size: 18.5px; line-height: 1.35; display: flex; gap: 12px; }
.qitem h3 .qn { font-family: var(--font-mono); font-size: 13px; color: var(--accent-text); padding-top: 4px; flex: none; }
.qitem p { margin-top: 10px; color: var(--ink-2); font-size: 15.5px; }
.qitem .lvl { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 6px; }

/* glossary */
.terms { display: grid; gap: 0; }
.term { padding: 22px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 20px; }
.term dt { font-family: var(--font-display); font-weight: 650; font-size: 19px; letter-spacing: -0.01em; }
.term dd { margin: 0; color: var(--ink-2); }
.term dd p + p { margin-top: 8px; }
.letter { font-family: var(--font-mono); font-size: 13px; color: var(--accent-text); padding: 30px 0 6px; letter-spacing: 0.08em; }
@media (max-width: 760px) { .term { grid-template-columns: 1fr; gap: 6px; } }

/* diagrams */
.diagram {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 18px;
}
.diagram svg { display: block; width: 100%; height: auto; }
.diagram .box { fill: var(--surface-2); stroke: var(--line-2); }
.diagram .box-hot { fill: var(--accent-soft); stroke: var(--accent); }
.diagram .lbl { fill: var(--ink); font-family: var(--font-body); font-size: 14px; font-weight: 600; }
.diagram .sub { fill: var(--ink-3); font-family: var(--font-mono); font-size: 11px; }
.diagram .edge { stroke: var(--ink-3); stroke-width: 1.5; fill: none; }
.diagram .edge-hot { stroke: var(--accent); stroke-width: 1.8; fill: none; }
.diagram .arrow { fill: var(--ink-3); }
.diagram .arrow-hot { fill: var(--accent); }

/* ---------- footer ---------- */

.site-footer { border-top: 1px solid var(--line); padding: 56px 0 40px; background: var(--surface); }
.foot-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr)); gap: 40px; }
.foot-grid p { color: var(--ink-3); font-size: 15px; margin-top: 14px; max-width: 42ch; }
.foot-grid h4 { font-family: var(--font-mono); font-size: 12px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 14px; }
.foot-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.foot-grid a { text-decoration: none; color: var(--ink-2); font-size: 15px; }
.foot-grid a:hover { color: var(--ink); text-decoration: underline; }
.foot-base { margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 13.5px; color: var(--ink-3); }
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr 1fr; } .foot-grid > div:first-child { grid-column: 1 / -1; } }
h2.letter { font-family: var(--font-mono); font-size: 13px; font-weight: 500; letter-spacing: 0.08em; color: var(--accent-text); padding: 30px 0 6px; }