/* Learn Claude — cool modern editorial aesthetic
   Typography: Instrument Serif (display), Geist (UI), Geist Mono (eyebrow/mono)
   Palette: paper-white with electric-indigo accent, OKLCH throughout */

@import url("https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Geist:wght@300;400;500;600;700&family=Geist+Mono:wght@400;500;600&display=swap");

:root {
  --paper:       oklch(0.985 0.003 255);
  --paper-2:     oklch(0.955 0.005 255);
  --paper-warm:  oklch(0.97 0.004 255);
  --surface:     #ffffff;
  --ink:         oklch(0.18 0.012 265);
  --muted:       oklch(0.52 0.012 265);
  --muted-2:     oklch(0.66 0.012 265);
  --line:        oklch(0.9 0.006 255);
  --line-soft:   oklch(0.94 0.005 255);
  --rust:        oklch(0.52 0.2 268);
  --rust-soft:   oklch(0.96 0.025 268);
  --rust-deep:   oklch(0.4 0.2 268);

  --serif: "Instrument Serif", "Iowan Old Style", "Apple Garamond", Georgia, serif;
  --sans:  "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono:  "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --gutter: clamp(1rem, 4vw, 2rem);
  --maxw: 1200px;
  --radius: 4px;
  --radius-pill: 999px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
}

/* Page wash — barely-there indigo + mint glows behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(60vw 50vh at 92% -10%, oklch(0.86 0.08 268 / 0.32), transparent 60%),
    radial-gradient(60vw 60vh at 4% -8%, oklch(0.92 0.06 175 / 0.28), transparent 65%),
    var(--paper);
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-color: var(--rust); }

::selection { background: var(--rust-soft); color: var(--rust-deep); }

/* Visually hidden */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0.5rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  text-decoration: none;
  border-radius: var(--radius);
  z-index: 1000;
}
.skip-link:focus { left: 0.75rem; outline: 2px solid var(--rust); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.9rem var(--gutter);
  background: color-mix(in oklch, var(--paper-warm) 78%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line-soft);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark {
  width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  box-shadow: 0 0 0 3px var(--rust-soft);
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
}
.top-nav a {
  position: relative;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  padding: 0.25rem 0;
}
.top-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}
.top-nav a:hover { color: var(--ink); }
.top-nav a:hover::after { transform: scaleX(1); }

/* Main + sections */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  position: relative;
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  border-top: 1px solid var(--line-soft);
}
.section:first-of-type { border-top: 0; }

/* Per-section editorial eyebrow numbers */
.section::before {
  position: absolute;
  top: clamp(1.4rem, 3vw, 2.2rem);
  left: 0;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted-2);
  pointer-events: none;
}
#setup::before          { content: "01 — Setup"; }
#method::before         { content: "02 — The Loop"; }
#examples::before       { content: "03 — Worked Examples"; }
#prompt-lab::before     { content: "04 — Prompt Lab"; }
#surfaces::before       { content: "05 — Surfaces"; }
#features-trio::before  { content: "06 — Foundations"; }
#fix-answer::before     { content: "07 — Repair"; }
#power-moves::before    { content: "08 — Power Moves"; }
#agents::before         { content: "09 — Agents"; }
#prompts::before        { content: "10 — Prompts"; }
#features::before       { content: "11 — Updates"; }
#sources::before        { content: "12 — Sources"; }

.section-head { margin: 0 0 2rem; max-width: 56ch; }
.section-head-action {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 1.5rem; flex-wrap: wrap; max-width: none;
}
.section h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2rem, 4.4vw, 3.2rem);
  line-height: 1.02;
  letter-spacing: -0.018em;
  margin: 0 0 0.7rem;
  color: var(--ink);
}
.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.55;
}

/* Hero */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
  padding: clamp(3.5rem, 8vw, 6.5rem) 0 clamp(3rem, 7vw, 5.5rem);
}
.hero::before,
.hero::after {
  position: absolute;
  top: 0.5rem;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.hero::before { content: "01 — Start here"; left: 0; }
.hero::after  { content: "Beginner-first, jargon-free"; right: 0; }

.hero-copy h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(3.6rem, 11vw, 9rem);
  line-height: 0.92;
  letter-spacing: -0.025em;
  margin: 0 0 1.5rem;
  color: var(--ink);
}
.hero-copy h1 em,
.hero-copy h1 i { font-style: italic; color: var(--rust-deep); }

.lede {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  line-height: 1.35;
  color: var(--muted);
  max-width: 38ch;
  margin: 0 0 1.6rem;
}

.official-links {
  display: flex; flex-wrap: wrap; gap: 0.6rem;
  margin: 0 0 1.4rem;
}

.task-shortcuts {
  display: flex; flex-wrap: wrap; gap: 0.4rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}
.task-shortcuts a {
  text-decoration: none;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--muted);
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}
.task-shortcuts a:hover {
  color: var(--ink);
  border-color: var(--ink);
  background: var(--surface);
}

/* Hero animation */
@media (prefers-reduced-motion: no-preference) {
  .hero-copy { animation: rise 600ms var(--ease) both; }
  .hero-task-panel { animation: rise 600ms var(--ease) 120ms both; }
}
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Hero task panel */
.hero-task-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.4rem;
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 500;
  font-size: 0.92rem;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease), box-shadow 220ms var(--ease), transform 180ms var(--ease);
}
.button:hover {
  border-color: var(--ink);
  background: var(--paper-warm);
}
.button.primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.button.primary:hover {
  background: var(--rust);
  border-color: var(--rust);
  color: #fff;
  box-shadow: 0 8px 24px -10px oklch(0.52 0.2 268 / 0.55), 0 0 0 4px var(--rust-soft);
  transform: translateY(-1px);
}
.button.small {
  padding: 0.45rem 0.7rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.button:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 2px;
}

/* Choice chips */
.choice {
  appearance: none;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 0.4rem 0.85rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease), box-shadow 220ms var(--ease);
}
.choice:hover { border-color: var(--ink); }
.choice.is-active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  box-shadow: 0 6px 18px -8px oklch(0.18 0.012 265 / 0.4);
}
.choice:focus-visible { outline: 2px solid var(--rust); outline-offset: 2px; }

.choice-grid,
.task-grid,
.surface-filter {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  margin: 0 0 0.9rem;
}
.task-grid.compact { gap: 0.35rem; }

.choice-label,
.tool-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted-2);
  margin: 0.2rem 0 0.55rem;
}

/* Field / textarea */
.field { margin: 0 0 1rem; }
.field label,
.field .choice-label { display: block; margin-bottom: 0.4rem; }

textarea,
input[type="text"] {
  width: 100%;
  font-family: var(--mono);
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  resize: vertical;
  caret-color: var(--rust);
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}
textarea:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--rust);
  box-shadow: 0 0 0 3px var(--rust-soft);
}

/* Borderless textareas inside cards */
.task-tool textarea,
.prompt-card textarea,
.template-details textarea {
  border: none;
  background: var(--paper-warm);
  border-radius: var(--radius);
}
.task-tool textarea:focus,
.prompt-card textarea:focus,
.template-details textarea:focus {
  box-shadow: 0 0 0 2px var(--rust-soft);
}

/* Prompt heads (label + copy button) */
.prompt-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.75rem;
  margin: 0 0 0.7rem;
}
.prompt-head h3 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.prompt-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.compact-head {
  background: var(--paper-warm);
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
}

/* Hairline-divided card grids — wrapper bg shows through 1px gaps */
.method-grid,
.setup-grid,
.power-grid,
.surface-grid,
.example-grid,
.feature-grid,
.glossary-grid,
.trust-grid,
.agent-lanes {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  overflow: hidden;
  list-style: none;
  padding: 0;
  margin: 0;
}

.method-grid    { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.setup-grid     { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.power-grid     { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.surface-grid   { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.example-grid   { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.feature-grid   { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.glossary-grid  { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.trust-grid     { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.agent-lanes    { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.method-card,
.setup-card,
.power-card,
.surface-card,
.example-card,
.feature-post,
.glossary-card,
.trust-card,
.agent-card {
  background: var(--surface);
  padding: 1.25rem 1.4rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  transition: background 200ms var(--ease);
}
.method-card:hover,
.setup-card:hover,
.power-card:hover,
.surface-card:hover,
.example-card:hover,
.feature-post:hover,
.glossary-card:hover,
.trust-card:hover,
.agent-card:hover { background: var(--paper-warm); }

.method-card h3,
.setup-card h3,
.power-card h3,
.surface-card h3,
.example-card h3,
.feature-post h3,
.glossary-card h3,
.trust-card h3,
.agent-card h3 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.005em;
  color: var(--ink);
}
.method-card p,
.setup-card p,
.power-card p,
.surface-card p,
.example-card p,
.feature-post p,
.glossary-card p,
.trust-card p,
.agent-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.55;
}
.method-card p strong,
.power-card p strong,
.feature-post p strong,
.example-card p strong,
.agent-card p strong { color: var(--ink); font-weight: 600; }

/* Big italic numerals */
.method-card span,
.power-card span:not(.surface-badge),
.agent-steps span {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 2.8rem;
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, var(--rust), var(--rust-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 0 0 0.2rem;
}

/* Surface badge */
.surface-badge {
  align-self: flex-start;
  display: inline-flex;
  padding: 0.25rem 0.55rem;
  background: var(--rust-soft);
  color: var(--rust-deep);
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius-pill);
}

/* Surface card actions */
.surface-actions {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  margin-top: auto;
  padding-top: 0.4rem;
}
.setup-link {
  font-family: var(--mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--rust-deep);
  text-decoration: none;
  margin-top: auto;
  padding-top: 0.4rem;
}
.setup-link::after { content: " →"; }
.setup-link:hover { color: var(--ink); }

/* Card links */
.card-links {
  font-family: var(--mono);
  font-size: 0.78rem;
  margin-top: auto !important;
  padding-top: 0.5rem;
}
.card-links a {
  color: var(--rust-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--rust-soft);
}
.card-links a:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* Resource rows */
.resource-row {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin: 1.5rem 0 0;
}
.course-row { margin-top: 0; }

/* Decision strip */
.decision-strip {
  margin-top: 1.5rem;
  padding: 1.25rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 0.95rem;
  color: var(--muted);
}
.decision-strip strong { color: var(--ink); }
.decision-strip p { margin: 0.3rem 0; }

/* Single-template stripes */
.single-template { margin-top: 1.5rem; }
.prompt-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.prompt-card.trust-prompt { background: var(--paper-warm); }

/* Worked examples specific */
.example-card .example-bad,
.example-card .example-good {
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.55;
  background: var(--paper-warm);
  border-radius: var(--radius);
  padding: 0.7rem 0.85rem;
  color: var(--muted);
}
.example-card .example-good { color: var(--ink); }

/* Prompt lab */
.prompt-lab {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.4rem;
}
.lab-output-head { margin-top: 1rem; }

/* Model fit */
.model-fit {
  margin-top: 1rem;
  background: var(--paper-warm);
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
}
.model-fit summary {
  display: flex; gap: 0.6rem; align-items: baseline;
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
}
.model-fit summary::-webkit-details-marker { display: none; }
.model-fit summary > span:first-child {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--rust-deep);
}
.model-fit summary > span:last-child { color: var(--muted); }
.model-links {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  margin-top: 0.8rem;
}

/* Surface filter row */
.surface-filter { margin-bottom: 1.2rem; }

/* Surface card hidden by filter */
.surface-card[hidden] { display: none; }

/* Details / disclosure */
details { border-radius: var(--radius); }
details > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.65rem 0;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 0.98rem;
  color: var(--ink);
}
details > summary::-webkit-details-marker { display: none; }
details > summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem; height: 1.5rem;
  border-radius: var(--radius-pill);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1;
  transition: transform 220ms var(--ease), background 220ms var(--ease);
}
details[open] > summary::before {
  content: "×";
  background: var(--rust);
  transform: rotate(180deg);
}

.section-details { margin-top: 1rem; }
.section-details > summary {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.template-details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.4rem 1.1rem;
  margin-bottom: 0.75rem;
}
.template-details > summary {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
}
.template-details[open] { padding-bottom: 1rem; }
.template-details .prompt-card {
  border: none;
  padding: 0;
  background: transparent;
}

/* Glossary / terms */
.terms-panel { margin-top: 1.5rem; }
.terms-panel > summary {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Trust rubric */
.trust-rubric { margin-top: 1.5rem; }
.trust-rubric h3 {
  margin: 0 0 0.7rem;
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* Agent steps */
.agent-steps {
  margin-top: 1.5rem;
  display: grid;
  gap: 1.2rem;
}
.agent-steps > * {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
}
.agent-steps span { align-self: start; }

/* Source list — 2 column with mono arrows */
.source-panel { margin-top: 1.5rem; }
.source-panel > summary {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.source-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  columns: 2;
  column-gap: 2.5rem;
  font-size: 0.95rem;
}
.source-list li {
  break-inside: avoid;
  padding: 0.35rem 0 0.35rem 1.2rem;
  position: relative;
  border-bottom: 1px solid var(--line-soft);
}
.source-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 0.4rem;
  font-family: var(--mono);
  color: var(--rust);
  font-size: 0.85rem;
}
.source-list a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px dotted var(--line);
}
.source-list a:hover { border-bottom-color: var(--ink); }

/* Footer */
.site-footer {
  max-width: var(--maxw);
  margin: 2rem auto 0;
  padding: 2rem var(--gutter) 3rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--muted-2);
  text-transform: uppercase;
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 1.2rem;
  transform: translateX(-50%) translateY(8px);
  background: var(--ink);
  color: var(--paper);
  padding: 0.65rem 1rem;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms var(--ease), transform 220ms var(--ease);
  z-index: 100;
}
.toast.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* Misc small bits */
.review-note {
  margin-top: 1.25rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted-2);
}
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--paper-warm);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  color: var(--rust-deep);
}

.older-updates { margin-top: 1.5rem; }

/* Responsive */
@media (max-width: 1100px) {
  .method-grid    { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .surface-grid   { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .glossary-grid  { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  .method-grid    { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .power-grid,
  .agent-lanes,
  .trust-grid,
  .example-grid   { grid-template-columns: 1fr; }
}

@media (max-width: 840px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.7rem;
  }
  .top-nav { gap: 1rem; }
  .hero { grid-template-columns: 1fr; }
  .hero::after { display: none; }
  .hero-copy h1 { font-size: clamp(3rem, 14vw, 5rem); }
  .task-tool { display: block; }
  .task-options, .task-result { width: 100%; }
  .setup-grid,
  .feature-grid   { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .surface-grid {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 78%;
    grid-template-columns: none;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    border-radius: 6px;
    background: var(--line-soft);
  }
  .surface-card { scroll-snap-align: start; }
  .source-list { columns: 1; }
}

@media (max-width: 560px) {
  .button { width: 100%; }
  .button.small { width: auto; }
  .official-links .button { width: 100%; }
  .source-list { columns: 1; }
  .model-fit summary { flex-direction: column; gap: 0.2rem; }
  .glossary-grid { grid-template-columns: 1fr; }
  .section h2 { font-size: clamp(1.7rem, 7vw, 2.4rem); }
}

/* Print */
@media print {
  .site-header,
  .toast,
  .skip-link,
  .top-nav { display: none !important; }
  body { background: #fff; color: #000; }
  body::before { display: none; }
  main { max-width: none; padding: 0; }
  .section { border-color: #ddd; padding: 1.5rem 0; }
  .button, .choice { border-color: #999; color: #000; background: #fff; }
}