/* ============================================================
   slm-125m — type + color system
   Display/body: Geist Sans · Data/technical: Geist Mono
   Palette drawn from the subject: ledger green (finance + legal
   seals) on cool paper, not a generic product-gradient.
   ============================================================ */

@font-face {
  font-family: "Geist";
  src: url("fonts/geist-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist";
  src: url("fonts/geist-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist";
  src: url("fonts/geist-700.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist";
  src: url("fonts/geist-900.woff2") format("woff2");
  font-weight: 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("fonts/geistmono-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("fonts/geistmono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("fonts/geistmono-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

:root {
  /* ---- palette: light (default) ---- */
  --paper: #f5f6f2;
  --paper-raised: #ffffff;
  --paper-sunken: #edefe9;
  --ink: #12180f;
  --ink-soft: #4c564e;
  --ink-faint: #838d80;
  --accent: #1f6d4f;
  --accent-strong: #164f39;
  --accent-tint: #e3efe7;
  --accent-on-accent: #f3fbf6;
  --line: #dcdfd6;
  --line-strong: #c6cbbf;
  --shadow: 0 1px 2px rgba(20, 30, 20, 0.04), 0 12px 32px -16px rgba(20, 30, 20, 0.16);

  /* ---- type scale ---- */
  --fs-hero: clamp(1.85rem, 3.1vw, 2.75rem);
  --fs-h1: clamp(1.5rem, 2.2vw, 2rem);
  --fs-h2: clamp(1.4rem, 2.2vw, 1.75rem);
  --fs-h3: 1.125rem;
  --fs-body: 1.0625rem;
  --fs-small: 0.875rem;
  --fs-micro: 0.75rem;
  --fs-stat: clamp(1.75rem, 3.4vw, 2.5rem);

  --font-sans: "Geist", -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --measure: 42rem;
  --wide: 72rem;
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0d100d;
    --paper-raised: #161a16;
    --paper-sunken: #101410;
    --ink: #eaece5;
    --ink-soft: #9ba69c;
    --ink-faint: #66706a;
    --accent: #4ed690;
    --accent-strong: #6ee3a4;
    --accent-tint: rgba(78, 214, 144, 0.12);
    --accent-on-accent: #06120c;
    --line: #232922;
    --line-strong: #303830;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 20px 44px -20px rgba(0, 0, 0, 0.65);
  }
}
:root[data-theme="dark"] {
  --paper: #0d100d;
  --paper-raised: #161a16;
  --paper-sunken: #101410;
  --ink: #eaece5;
  --ink-soft: #9ba69c;
  --ink-faint: #66706a;
  --accent: #4ed690;
  --accent-strong: #6ee3a4;
  --accent-tint: rgba(78, 214, 144, 0.12);
  --accent-on-accent: #06120c;
  --line: #232922;
  --line-strong: #303830;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 20px 44px -20px rgba(0, 0, 0, 0.65);
}
:root[data-theme="light"] {
  --paper: #f5f6f2;
  --paper-raised: #ffffff;
  --paper-sunken: #edefe9;
  --ink: #12180f;
  --ink-soft: #4c564e;
  --ink-faint: #838d80;
  --accent: #1f6d4f;
  --accent-strong: #164f39;
  --accent-tint: #e3efe7;
  --accent-on-accent: #f3fbf6;
  --line: #dcdfd6;
  --line-strong: #c6cbbf;
  --shadow: 0 1px 2px rgba(20, 30, 20, 0.04), 0 12px 32px -16px rgba(20, 30, 20, 0.16);
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3 { text-wrap: balance; margin: 0; font-weight: 700; letter-spacing: -0.02em; }
p { margin: 0; }
a { color: var(--accent); }
::selection { background: var(--accent); color: var(--accent-on-accent); }

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 3rem); }
.prose { max-width: var(--measure); margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 3rem); }

section { padding: clamp(3.5rem, 8vw, 7rem) 0; }
section + section { border-top: 1px solid var(--line); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---- nav ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(16px) saturate(1.3);
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}
.nav-mark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
}
.nav-mark span { color: var(--accent); }
.nav-links { display: flex; gap: 1.75rem; font-size: var(--fs-small); }
.nav-links a { color: var(--ink-soft); text-decoration: none; }
.nav-links a:hover { color: var(--ink); }

/* ---- hero ---- */
.hero { padding-top: clamp(2.5rem, 6vw, 4rem); }
.hero-head { max-width: 40rem; }
.hero h1 {
  font-size: var(--fs-hero);
  line-height: 1.18;
  margin-top: 0.85rem;
  font-weight: 600;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent);
}
.hero-sub {
  margin-top: 1.25rem;
  font-size: 1.0625rem;
  color: var(--ink-soft);
  max-width: 34rem;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}
.badge {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.02em;
  padding: 0.4rem 0.75rem;
  border-radius: 100px;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
}

/* ---- demo panel ---- */
.demo {
  margin-top: 3rem;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.demo-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper-sunken);
}
.demo-bar-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.dot.busy { animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }

.demo-body { padding: 1.5rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
.chip {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-s);
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.chip:hover { border-color: var(--accent); color: var(--ink); }

.input-row {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}
textarea#prompt {
  flex: 1;
  resize: none;
  min-height: 4.25rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.5;
}
textarea#prompt:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.run-btn {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.95rem 1.4rem;
  border-radius: var(--radius-m);
  border: none;
  background: var(--accent);
  color: var(--accent-on-accent);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease, transform 0.1s ease;
}
.run-btn:hover { background: var(--accent-strong); }
.run-btn:active { transform: scale(0.98); }
.run-btn:disabled { opacity: 0.5; cursor: progress; }

.slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-soft);
}
.slider-row input[type="range"] { accent-color: var(--accent); flex: 1; max-width: 12rem; }

.output {
  margin-top: 1.25rem;
  border-top: 1px dashed var(--line-strong);
  padding-top: 1.25rem;
  position: relative;
}
.output-doc {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.75;
  background: repeating-linear-gradient(
    var(--paper-sunken),
    var(--paper-sunken) 1.74em,
    var(--line) 1.74em,
    var(--line) calc(1.74em + 1px)
  );
  background-attachment: local;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-s);
  min-height: 6.5rem;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink);
}
.output-doc .prompt-echo { color: var(--ink-faint); }
.output-doc .gen-text { color: var(--ink); }
.output-doc .cursor {
  display: inline-block;
  width: 0.5em;
  height: 1em;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 0.9s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.output-placeholder { color: var(--ink-faint); font-style: normal; }

.stamp {
  position: absolute;
  top: -0.6rem;
  right: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  padding: 0.3rem 0.6rem;
  background: var(--accent-tint);
  color: var(--accent-strong);
  border: 1px solid var(--accent);
  border-radius: var(--radius-s);
  transform: rotate(-2deg);
}

.meta-row {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-faint);
  flex-wrap: wrap;
}
.disclaimer {
  margin-top: 1rem;
  font-size: var(--fs-small);
  color: var(--ink-faint);
  max-width: 40rem;
}
.error-msg { color: #b8452f; font-family: var(--font-mono); font-size: var(--fs-small); margin-top: 0.75rem; }
@media (prefers-color-scheme: dark) { .error-msg { color: #ff8a6b; } }
:root[data-theme="dark"] .error-msg { color: #ff8a6b; }
:root[data-theme="light"] .error-msg { color: #b8452f; }

/* ---- section headers ---- */
.section-head { max-width: 34rem; margin-bottom: clamp(2rem, 5vw, 3.5rem); }
.section-head h2 { font-size: var(--fs-h1); margin-top: 0.75rem; }
.section-head p { margin-top: 0.9rem; color: var(--ink-soft); }

/* ---- spec sheet ---- */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 clamp(2rem, 5vw, 4rem);
}
@media (max-width: 640px) { .spec-grid { grid-template-columns: 1fr; } }
.spec-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}
.spec-key { color: var(--ink-soft); font-size: var(--fs-small); }
.spec-val { font-family: var(--font-mono); font-weight: 500; text-align: right; }

/* ---- pipeline ---- */
.pipeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
@media (max-width: 860px) { .pipeline { grid-template-columns: 1fr; } }
.stage {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 1.5rem;
  position: relative;
}
.stage-num {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--accent);
  letter-spacing: 0.08em;
}
.stage h3 { margin-top: 0.6rem; font-size: 1.0625rem; }
.stage p { margin-top: 0.6rem; font-size: var(--fs-small); color: var(--ink-soft); }
.stage-figure {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--ink);
}
.stage-figure span { font-size: var(--fs-small); color: var(--ink-faint); font-weight: 400; }
.stage-arrow {
  display: none;
}
@media (min-width: 861px) {
  .stage:not(:last-child)::after {
    content: "→";
    position: absolute;
    right: -1.05rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ink-faint);
    font-family: var(--font-mono);
    z-index: 2;
  }
}

/* ---- source table ---- */
.table-wrap { overflow-x: auto; margin-top: 2.5rem; }
table.sources { width: 100%; border-collapse: collapse; min-width: 480px; }
table.sources th, table.sources td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-small);
}
table.sources th {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  font-weight: 500;
}
table.sources td.num { font-family: var(--font-mono); text-align: right; }
table.sources td:first-child, table.sources th:first-child { padding-left: 0; }

/* ---- mix bar ---- */
.mixbar {
  display: flex;
  height: 2.5rem;
  border-radius: var(--radius-s);
  overflow: hidden;
  margin-top: 1rem;
  border: 1px solid var(--line);
}
.mixbar > div { display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-size: var(--fs-micro); color: var(--accent-on-accent); }
.mix-legend { display: flex; gap: 1.5rem; margin-top: 0.9rem; flex-wrap: wrap; font-family: var(--font-mono); font-size: var(--fs-micro); color: var(--ink-soft); }
.mix-legend span.sw { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 0.4em; vertical-align: middle; }

/* ---- stat row ---- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}
.stat .num { font-family: var(--font-mono); font-size: var(--fs-stat); font-weight: 600; color: var(--ink); letter-spacing: -0.02em; }
.stat .num .unit { font-size: 0.5em; color: var(--ink-faint); margin-left: 0.15em; }
.stat .label { margin-top: 0.35rem; font-size: var(--fs-small); color: var(--ink-soft); }

/* ---- chart ---- */
.chart-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  padding: clamp(1.25rem, 3vw, 2rem);
  box-shadow: var(--shadow);
}
.chart-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
.chart-head h3 { font-size: 1rem; }
.chart-head .mono { color: var(--ink-faint); font-size: var(--fs-micro); }
#loss-chart { width: 100%; height: auto; display: block; }

/* ---- hyperparam list reuses spec-grid ---- */

/* ---- results / links ---- */
.result-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow);
}
.result-card .r-label { font-size: var(--fs-small); color: var(--ink-soft); }
.result-card .r-value { font-family: var(--font-mono); font-size: 1.5rem; font-weight: 600; margin-top: 0.25rem; }
.link-card {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.5rem;
  padding: 0.85rem 1.25rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-m);
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  transition: border-color 0.15s ease, transform 0.1s ease;
}
.link-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.link-card .arrow { color: var(--accent); }

.stack-note { margin-top: 3rem; font-size: var(--fs-small); color: var(--ink-faint); }
.stack-note b { color: var(--ink-soft); font-weight: 500; }

footer {
  padding: 2.5rem 0 3.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-faint);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---- reveal on scroll ---- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .dot.busy { animation: none; }
  .cursor { animation: none; }
}

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ============================================================
   Guide-page components (docs.html): code blocks, callouts,
   TOC pills, a lettered concept list, and a two-column
   explainer layout. Built on the same tokens as the rest of
   the site — no new colors introduced.
   ============================================================ */

.guide-hero { padding-top: clamp(2.5rem, 6vw, 4rem); padding-bottom: 0; }
.guide-hero .hero-sub { max-width: 40rem; }

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
  padding-bottom: 2rem;
}
.toc a {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  text-decoration: none;
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  padding: 0.45rem 0.85rem;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.toc a:hover { border-color: var(--accent); color: var(--ink); }
.toc a .n { color: var(--accent); margin-right: 0.45em; }

.g-section-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}

/* two-column explainer: prose left, supporting visual/aside right */
.explainer {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
@media (max-width: 860px) { .explainer { grid-template-columns: 1fr; } }
.explainer .prose-col > * + * { margin-top: 1.1rem; }
.explainer .prose-col p { color: var(--ink-soft); }
.explainer .prose-col h3 { font-size: 1rem; color: var(--ink); margin-top: 1.75rem; }

/* "in plain terms" callout */
.callout {
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: var(--radius-m);
  padding: 1.1rem 1.25rem;
}
.callout .c-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-strong);
  display: block;
  margin-bottom: 0.4rem;
}
.callout p { color: var(--ink); font-size: 0.95rem; }

/* code / terminal block */
.code-block {
  background: var(--paper-sunken);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}
.code-block .cb-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-faint);
}
.code-block .cb-bar .dot-row { display: flex; gap: 0.3rem; }
.code-block .cb-bar .dot-row span { width: 7px; height: 7px; border-radius: 50%; background: var(--line-strong); }
.code-block pre {
  margin: 0;
  padding: 1rem 1.15rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--ink);
}
.code-block .c { color: var(--ink-faint); } /* comment */
.code-block .g { color: var(--accent-strong); } /* output/highlight */

/* concept diagram: horizontal token/flow strip, reuses pipeline arrow motif */
.flow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin: 1.5rem 0;
}
.flow .f-step {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  background: var(--paper-raised);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-s);
  padding: 0.55rem 0.9rem;
}
.flow .f-arrow { color: var(--ink-faint); font-family: var(--font-mono); }

/* BPE merge example table */
.merge-steps {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}
.merge-steps .m-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-s);
  background: var(--paper-raised);
  border: 1px solid var(--line);
}
.merge-steps .m-row .m-n { color: var(--ink-faint); width: 1.3rem; }
.merge-steps .m-row .m-arrow { color: var(--accent); }

/* definition list (term / plain-English meaning pairs) */
.deflist { display: flex; flex-direction: column; }
.deflist .d-row {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 640px) { .deflist .d-row { grid-template-columns: 1fr; } }
.deflist .d-term { font-family: var(--font-mono); font-weight: 600; font-size: var(--fs-small); }
.deflist .d-desc { font-size: var(--fs-small); color: var(--ink-soft); }

/* step-numbered tutorial list */
.steps { counter-reset: step; display: flex; flex-direction: column; gap: 1.75rem; }
.steps .step { position: relative; padding-left: 2.75rem; }
.steps .step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.1rem;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 50%;
  border: 1px solid var(--accent);
  color: var(--accent-strong);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}
.steps .step h4 { font-size: 1rem; }
.steps .step p { margin-top: 0.4rem; color: var(--ink-soft); font-size: var(--fs-small); }

.cross-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--fs-small);
  color: var(--ink-soft);
  text-decoration: none;
}
.cross-link:hover { color: var(--accent); }