/* Agents Are Loops — workshop ledger theme */

:root {
  --paper: #F7F4EF;
  --ink: #1C2329;
  --teal: #2F6F6A;
  --teal-light: #C8E0DD;
  --terracotta: #B85C38;
  --terracotta-dark: #8A3F22;
  --surface: #FDFCFA;
  --border: #D4CEC4;
  --muted: #5C656D;
  --shadow: 0 2px 8px rgba(28, 35, 41, 0.06);
  --shadow-lg: 0 4px 20px rgba(28, 35, 41, 0.08);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 72rem;
  --header-height: 3.25rem;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
  --focus-outline: 3px solid var(--terracotta-dark);
  --focus-offset: 2px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -1px -1px;
  overflow-x: hidden;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.75rem 1.25rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
}
.skip-link:focus {
  top: max(1rem, env(safe-area-inset-top, 0px));
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

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

/* Shared focus */
:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--border);
  padding-top: env(safe-area-inset-top, 0px);
  max-width: 100%;
  overflow: hidden;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.5rem 1rem;
  padding-left: max(1rem, env(safe-area-inset-left, 0px));
  padding-right: max(1rem, env(safe-area-inset-right, 0px));
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: var(--header-height);
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.brand-mark { flex-shrink: 0; }

.brand-text {
  letter-spacing: -0.02em;
  font-family: var(--font-display);
}

.brand-em {
  color: var(--teal);
  font-style: normal;
  font-weight: 800;
}

.site-nav {
  display: flex;
  gap: 0.125rem;
  flex-wrap: nowrap;
  flex: 1 1 auto;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  margin-left: auto;
  min-width: 0;
  scroll-padding-inline: 0.5rem;
}
.site-nav::-webkit-scrollbar { display: none; }

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.5rem 0.625rem;
  border-radius: var(--radius);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  flex-shrink: 0;
  scroll-margin-inline: 0.25rem;
}
.site-nav a:hover { color: var(--teal); }

/* Sections */
.section {
  padding: 3.5rem 1.25rem;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
}

.section-folio {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--terracotta-dark);
  margin: 0 0 0.5rem;
}

h1, h2, h3 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--ink);
}
h1, h2 {
  font-family: var(--font-display);
}
h1 { font-size: clamp(1.875rem, 5vw, 2.75rem); margin: 0 0 1rem; }
h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
h3 { font-size: 1.125rem; margin: 0 0 0.5rem; }

.section-intro {
  color: var(--muted);
  max-width: 42rem;
  margin: 0 0 2rem;
  font-size: 1.0625rem;
}

.eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--teal);
  margin: 0 0 0.75rem;
}

.lead {
  font-size: 1.125rem;
  max-width: 36rem;
  margin: 0 0 1.5rem;
}

/* Hero */
.hero {
  padding-top: 2rem;
  padding-bottom: 3rem;
}
.hero-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 2rem;
  align-items: center;
  padding: 0 1.25rem;
}
@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    padding: 0 1.25rem;
  }
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  text-decoration: none;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  max-width: 100%;
  white-space: normal;
  text-align: center;
}
.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}
.btn-primary {
  background: var(--teal);
  color: var(--paper);
  border-color: var(--teal);
  box-shadow: 3px 3px 0 var(--ink);
}
.btn-primary:hover:not(:disabled) { background: #265a56; border-color: #265a56; }
.btn-primary:active:not(:disabled) {
  box-shadow: 1px 1px 0 var(--ink);
  transform: translate(2px, 2px);
}
.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--border);
}
.btn-secondary:hover {
  border-color: var(--teal);
  color: var(--teal);
}
.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--border);
}
.btn-ghost:hover:not(:disabled) { color: var(--ink); border-color: var(--ink); }

.hero-figure { margin: 0; }
.hero-machine {
  width: 100%;
  max-width: 420px;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Diagram */
.canonical-diagram {
  margin: 0 0 2rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.canonical-diagram svg {
  display: block;
  width: 100%;
  min-width: 280px;
  height: auto;
}

.text-equiv {
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border-left: 4px solid var(--teal);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.loop-steps-list {
  margin: 0;
  padding-left: 1.25rem;
}
.loop-steps-list li { margin-bottom: 0.5rem; }

.flow-step { transition: opacity 0.2s; }
.flow-step.is-active rect,
.flow-step.is-active polygon {
  stroke: var(--terracotta);
  stroke-width: 2.5;
}
.flow-step.is-done { opacity: 0.55; }

/* Pattern section */
.policy-fork { margin-bottom: 2rem; }
.fork-svg {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
@media (max-width: 480px) {
  .policy-fork { display: none; }
}

.example-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}
@media (min-width: 640px) {
  .example-cards { grid-template-columns: repeat(3, 1fr); }
}
.example-card {
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.example-card h3 { color: var(--teal); font-size: 1rem; font-family: var(--font-sans); }
.example-card p { margin: 0; font-size: 0.9375rem; color: var(--muted); }

/* Pseudocode */
.pseudocode-section .section-inner { max-width: 52rem; }
.code-block {
  margin: 0;
  padding: 1.25rem 1.5rem;
  background: var(--ink);
  color: #E8E6E3;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  box-shadow: var(--shadow-lg);
  border: 1px solid #2a3339;
  word-break: break-word;
  white-space: pre-wrap;
}
.code-block .kw { color: #7EC8C0; }
.code-block .fn { color: #E8B87A; }
.code-block .cm { color: #96A0AA; font-style: italic; }

/* What's new */
.new-grid {
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 768px) {
  .new-grid { grid-template-columns: repeat(3, 1fr); }
}
.new-card {
  padding: 1.5rem 0 0;
  border-top: 3px solid var(--terracotta);
}
.new-card h3 { color: var(--terracotta-dark); font-family: var(--font-display); }
.new-card p { margin: 0; font-size: 0.9375rem; color: var(--muted); }

/* Exercise */
.exercise-section {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.noscript-fallback {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--paper);
}
.noscript-fallback ol { padding-left: 1.25rem; }
.noscript-fallback li { margin-bottom: 0.35rem; }

.exercise-app {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 100%;
  overflow: hidden;
}

.exercise-header {
  padding: 0.75rem 1rem;
  background: var(--paper);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.exercise-round-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--teal-light);
  color: #1a4f4b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 55%;
}
.exercise-round-badge.is-llm {
  background: #f0ddd4;
  color: var(--terracotta-dark);
}

/* Swappable policy cartridge */
.policy-bay {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: #fffaf3;
  border-bottom: 1px solid var(--border);
  min-width: 0;
}
.policy-bay-label,
.policy-bay-note {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  white-space: nowrap;
}
.policy-machine {
  list-style: none;
  margin: 0;
  padding: 0.2rem 0.25rem 0.3rem;
  display: grid;
  grid-template-columns: repeat(5, minmax(70px, 1fr));
  gap: 0.4rem;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}
.policy-machine li {
  min-height: 46px;
  padding: 0.4rem 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  text-align: center;
  scroll-snap-align: center;
}
.policy-machine li > span[aria-hidden="true"] {
  width: 1.15rem;
  height: 1.15rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 0.625rem;
  flex-shrink: 0;
}
.policy-machine .policy-cartridge {
  min-width: 112px;
  min-height: 58px;
  flex-direction: column;
  gap: 0.1rem;
  color: var(--ink);
  border-width: 2px;
  border-style: solid;
  box-shadow: 3px 3px 0 var(--ink);
  transform: rotate(-0.7deg);
}
.policy-cartridge--rule {
  background: #f8e8df !important;
  border-color: var(--terracotta) !important;
}
.policy-cartridge--llm {
  background: #e2f1ef !important;
  border-color: var(--teal) !important;
}
.policy-slot-label {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.policy-cartridge strong {
  font-family: var(--font-display);
  font-size: 0.875rem;
}

@media (max-width: 720px) {
  .policy-bay {
    grid-template-columns: 1fr;
    gap: 0.25rem;
    padding: 0.6rem 0.75rem;
  }
  .policy-bay-label,
  .policy-bay-note {
    white-space: normal;
  }
  .policy-bay-note {
    text-align: right;
  }
  .policy-machine {
    grid-template-columns: repeat(5, minmax(62px, 1fr));
  }
  .policy-machine li {
    padding-inline: 0.35rem;
  }
  .policy-machine .policy-cartridge {
    min-width: 106px;
  }
}

.exercise-layout {
  display: grid;
  gap: 0;
  min-width: 0;
}
@media (min-width: 768px) {
  .exercise-layout {
    grid-template-columns: minmax(140px, 220px) 1fr;
  }
}

.loop-progress {
  padding: 0.75rem 1rem;
  background: var(--paper);
  border-bottom: 1px solid var(--border);
  min-width: 0;
  max-width: 100%;
}
@media (min-width: 768px) {
  .loop-progress {
    border-bottom: none;
    border-right: 1px solid var(--border);
  }
}

.loop-progress ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 0.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.loop-progress ol::-webkit-scrollbar { display: none; }

@media (min-width: 768px) {
  .loop-progress ol {
    flex-direction: column;
    flex-wrap: wrap;
    gap: 0.5rem;
    overflow-x: visible;
  }
}

.loop-progress li {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  padding: 0.25rem 0.4rem;
  border-radius: var(--radius);
  min-height: 32px;
  white-space: nowrap;
  flex-shrink: 0;
}
.loop-progress li.is-current {
  color: var(--ink);
  background: var(--surface);
  box-shadow: inset 3px 0 0 var(--terracotta);
}
.loop-progress li.is-done { color: var(--teal); }

.loop-progress .step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
}
.loop-progress li.is-current .step-dot { background: var(--terracotta); }
.loop-progress li.is-done .step-dot { background: var(--teal); }
.phase-tech {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.6875rem;
}

/* Trace ledger */
.trace-ledger {
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: #C8C4BE;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  line-height: 1.5;
  max-height: 120px;
  overflow-x: auto;
  overflow-y: auto;
  border-bottom: 1px solid #2a3339;
  -webkit-overflow-scrolling: touch;
}
.trace-ledger-label {
  margin-bottom: 0.4rem;
  color: #A8B0B8;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.trace-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.trace-ledger .trace-line {
  display: grid;
  grid-template-columns: 1.25rem max-content minmax(0, 1fr);
  align-items: start;
  gap: 0.35rem;
  word-break: break-word;
  overflow-wrap: anywhere;
  margin-bottom: 0.35rem;
}
.trace-ledger .trace-phase {
  color: var(--teal-light);
  font-weight: 600;
}
.trace-stamp {
  width: 1.1rem;
  height: 1.1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #7EC8C0;
  border-radius: 3px;
  color: #C8E0DD;
  font-size: 0.625rem;
  font-weight: 800;
  line-height: 1;
}
.trace-copy {
  min-width: 0;
}
.trace-ledger .trace-empty {
  color: #7A8490;
  font-style: italic;
  list-style: none;
}
@media (prefers-reduced-motion: no-preference) {
  .trace-line.is-new .trace-stamp {
    animation: trace-stamp-in 0.22s ease-out;
  }
}
@keyframes trace-stamp-in {
  from { opacity: 0; transform: scale(1.5) rotate(-8deg); }
  to { opacity: 1; transform: scale(1) rotate(0); }
}

/* Exercise main panel */
.exercise-panel {
  padding: 1rem;
  min-height: 160px;
  min-width: 0;
  overflow-wrap: break-word;
}
.exercise-panel h3 {
  margin: 0 0 0.75rem;
  font-size: 1.0625rem;
  font-family: var(--font-display);
}
.exercise-panel h3:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}
.exercise-panel p { margin: 0 0 1rem; }
.exercise-panel .step-detail {
  padding: 0.875rem;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.875rem;
  overflow-x: auto;
  word-break: break-word;
}
.step-detail code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: rgba(47, 111, 106, 0.1);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  word-break: break-all;
}
.step-detail .policy-tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2em 0.5em;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}
.policy-tag--rule { background: #f0ddd4; color: var(--terracotta-dark); }
.policy-tag--llm { background: #d4e8e6; color: #1a4f4b; }
.text-error { color: var(--terracotta-dark); font-weight: 600; }

.note-callout {
  padding: 0.75rem 0.875rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  font-size: 0.875rem;
}
.note-callout-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}
.note-callout-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82em;
  line-height: 1.5;
}
.note-callout--ignored {
  background: #f5f3ef;
  border-style: dashed;
  border-color: var(--muted);
  opacity: 0.92;
}
.note-callout--ignored .note-callout-label { color: var(--muted); }
.note-callout--salient {
  background: #eef6f5;
  border-color: var(--teal);
  border-width: 2px;
}
.note-callout--salient .note-callout-label { color: #1a4f4b; }

.prediction-feedback {
  margin-top: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
}
.prediction-feedback.is-correct {
  background: #d4e8e6;
  border: 1px solid var(--teal);
  color: #1a4f4b;
}
.prediction-feedback.is-wrong {
  background: #f0ddd4;
  border: 1px solid var(--terracotta);
  color: var(--terracotta-dark);
}
.prediction-feedback.is-neutral {
  background: var(--paper);
  border: 1px solid var(--border);
  color: var(--ink);
}

.completion-payoff {
  padding: 1rem;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
}
.completion-payoff ul {
  margin: 0.75rem 0;
  padding-left: 1.25rem;
}
.completion-payoff p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.9375rem;
}
.receipt-stamp {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.25rem 0.5rem;
  border: 2px solid var(--terracotta);
  border-radius: 4px;
  color: var(--terracotta-dark);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transform: rotate(-1deg);
}

.exercise-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  min-width: 0;
}
.exercise-actions--compact {
  margin-top: 0;
  flex-shrink: 0;
}

.exercise-fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  margin: 0 0 1rem;
  min-width: 0;
}
.exercise-fieldset legend {
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0 0.25rem;
}
.radio-option {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.5rem 0;
  min-height: 44px;
  cursor: pointer;
}
.radio-option input {
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.2rem;
  accent-color: var(--teal);
  flex-shrink: 0;
}

.quiz-feedback {
  margin-top: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
}
.quiz-feedback.is-correct {
  background: #d4e8e6;
  border: 1px solid var(--teal);
  color: #1a4f4b;
}
.quiz-feedback.is-wrong {
  background: #f0ddd4;
  border: 1px solid var(--terracotta);
  color: var(--terracotta-dark);
}

.comparison-box {
  padding: 1.25rem;
  background: var(--paper);
  border: 2px solid var(--teal);
  border-radius: var(--radius-lg);
  margin-bottom: 1rem;
  overflow-wrap: break-word;
}
.comparison-box ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}
.comparison-box li {
  margin-bottom: 0.4rem;
}
.comparison-box code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  word-break: break-all;
}

/* Guardrail lab */
.guardrail-app {
  margin-top: 1rem;
}
.guardrail-layout {
  display: grid;
  gap: 1rem;
}
@media (min-width: 768px) {
  .guardrail-layout {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}
.guardrail-controls,
.guardrail-output {
  min-width: 0;
}
.guardrail-hint,
.guardrail-eli5-block,
.guardrail-story,
.guardrail-note {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0 0 0.75rem;
}
.guardrail-eli5 {
  display: block;
  font-size: 0.8125rem;
  color: var(--muted);
  font-weight: 400;
  margin-top: 0.15rem;
}
.checkbox-option {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.5rem 0;
  min-height: 44px;
  cursor: pointer;
}
.checkbox-option input {
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.2rem;
  accent-color: var(--teal);
  flex-shrink: 0;
}
.guardrail-fieldset {
  margin-bottom: 0.75rem;
}
.guardrail-result {
  padding: 1rem;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}
.guardrail-result h4 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
}
.guardrail-result h4:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}
.guardrail-proposal {
  margin-bottom: 0.75rem;
}
.guard-check-list {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}
.guard-check {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  border: 1px solid var(--border);
}
.guard-check-verdict {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  flex-shrink: 0;
  min-width: 4.5rem;
}
.guard-check--pass {
  background: #eef6f5;
  border-color: var(--teal);
}
.guard-check--pass .guard-check-verdict { color: #1a4f4b; }
.guard-check--block {
  background: #fdf3ee;
  border-color: var(--terracotta);
}
.guard-check--block .guard-check-verdict { color: var(--terracotta-dark); }
.guard-check--warn {
  background: #fff8e8;
  border-color: #c9a227;
  font-style: italic;
}
.guard-verdict {
  margin: 0;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
}
.guard-verdict--block {
  background: #d4e8e6;
  border: 1px solid var(--teal);
  color: #1a4f4b;
}
.guard-verdict--allow {
  background: #f0ddd4;
  border: 1px solid var(--terracotta);
  color: var(--terracotta-dark);
}
.guardrail-scorecard {
  padding: 1rem;
  background: var(--surface);
  border: 2px solid var(--teal);
  border-radius: var(--radius-lg);
  margin-bottom: 1rem;
}
.guardrail-scorecard h4 {
  margin: 0 0 0.5rem;
  font-size: 0.9375rem;
  font-family: var(--font-display);
}
.guardrail-score-summary {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}
.guardrail-score-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
  font-size: 0.875rem;
}
.guardrail-score-list .score-prevented { color: #1a4f4b; }
.guardrail-score-list .score-gap { color: var(--terracotta-dark); }
.guardrail-replay-log {
  font-size: 0.8125rem;
  color: var(--muted);
}
.guardrail-replay-log summary {
  cursor: pointer;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.guardrail-replay-log ol {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}
.guardrail-status {
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  min-height: 2.75rem;
}

.exercise-status {
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  min-height: 2.75rem;
}

/* Landscape / short viewport */
@media (max-height: 500px) and (orientation: landscape) {
  .trace-ledger {
    max-height: 70px;
    font-size: 0.625rem;
    padding: 0.4rem 0.75rem;
    line-height: 1.35;
  }
  .trace-ledger-label {
    display: none;
  }
  .exercise-app {
    position: relative;
  }
  .exercise-header {
    flex-shrink: 0;
    padding: 0.4rem 0.75rem;
  }
  .exercise-round-badge {
    font-size: 0.625rem;
    padding: 0.25rem 0.5rem;
    max-width: 50%;
  }
  .policy-bay {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.4rem;
    padding: 0.3rem 0.6rem;
  }
  .policy-bay-note {
    display: none;
  }
  .policy-machine {
    grid-template-columns: repeat(5, minmax(54px, 1fr));
    gap: 0.25rem;
    padding: 0.1rem;
  }
  .policy-machine li {
    min-height: 32px;
    padding: 0.2rem 0.3rem;
    font-size: 0.625rem;
  }
  .policy-machine li > span[aria-hidden="true"] {
    display: none;
  }
  .policy-machine .policy-cartridge {
    min-width: 88px;
    min-height: 38px;
  }
  .policy-cartridge strong {
    font-size: 0.75rem;
  }
  .policy-slot-label {
    font-size: 0.5625rem;
  }
  .exercise-actions--compact .btn {
    min-height: 44px;
    padding: 0.35rem 0.75rem;
    font-size: 0.8125rem;
  }
  .exercise-app {
    display: flex;
    flex-direction: column;
    max-height: calc(100dvh - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px) - 1.5rem);
  }
  .exercise-layout {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  .loop-progress {
    padding: 0.35rem 0.6rem;
    flex-shrink: 0;
  }
  .loop-progress ol {
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 0.25rem;
    overflow-x: auto;
  }
  .loop-progress li {
    min-height: 24px;
    font-size: 0.625rem;
    padding: 0.15rem 0.3rem;
  }
  .loop-progress .step-dot {
    width: 6px;
    height: 6px;
  }
  .exercise-panel {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    padding: 0.5rem 0.75rem 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    scroll-padding-bottom: 3.5rem;
  }
  .exercise-panel h3 {
    margin-bottom: 0.4rem;
    font-size: 0.9375rem;
  }
  .exercise-panel p,
  .exercise-panel .step-detail {
    margin-bottom: 0.5rem;
    font-size: 0.8125rem;
  }
  .exercise-panel .step-detail {
    padding: 0.5rem 0.625rem;
  }
  .exercise-fieldset {
    padding: 0.625rem;
    margin-bottom: 0.5rem;
  }
  .radio-option {
    min-height: 36px;
    padding: 0.25rem 0;
    font-size: 0.8125rem;
  }
  .exercise-panel > .exercise-actions:not(.exercise-actions--compact) {
    position: sticky;
    bottom: 0;
    margin-top: auto;
    padding: 0.5rem 0;
    padding-bottom: max(0.5rem, env(safe-area-inset-bottom, 0px));
    background: linear-gradient(to top, var(--surface) 70%, rgba(253, 252, 250, 0.92) 88%, transparent);
    border-top: 1px solid var(--border);
    z-index: 2;
    flex-shrink: 0;
    box-shadow: 0 -4px 12px rgba(28, 35, 41, 0.04);
  }
  .exercise-panel > .exercise-actions:not(.exercise-actions--compact) .btn {
    min-height: 44px;
  }
  .quiz-feedback {
    margin-top: 0.35rem;
    padding: 0.5rem 0.625rem;
    font-size: 0.8125rem;
    flex-shrink: 0;
  }
  .prediction-feedback {
    margin-top: 0.35rem;
    padding: 0.5rem 0.625rem;
    font-size: 0.8125rem;
    flex-shrink: 0;
  }
  .note-callout {
    padding: 0.5rem 0.625rem;
    margin-bottom: 0.5rem;
    font-size: 0.8125rem;
  }
  .exercise-status {
    flex-shrink: 0;
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
    min-height: 2rem;
  }
  .site-header { position: relative; }
}

/* Spectrum */
.spectrum {
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 768px) {
  .spectrum { grid-template-columns: repeat(3, 1fr); }
}
.spectrum-card {
  padding: 1.5rem 0 0;
  border-top: 2px solid var(--border);
  position: relative;
}
.spectrum-card--mid {
  border-top-color: var(--teal);
}
.spectrum-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.spectrum-card h3 { margin-top: 0.5rem; color: var(--ink); font-family: var(--font-display); }
.spectrum-card p { margin: 0 0 0.75rem; font-size: 0.9375rem; color: var(--muted); }
.spectrum-when { font-size: 0.875rem !important; color: var(--ink) !important; }

/* Risks */
.risk-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}
.risk-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
}
.risk-list li:last-child { border-bottom: none; }

/* Takeaway */
.takeaway-quote {
  margin: 0 0 2rem;
  padding: 1.5rem 0;
  border-top: 2px solid var(--terracotta);
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-style: italic;
}
.takeaway-quote p { margin: 0; }

.glossary {
  display: grid;
  gap: 0.75rem 2rem;
  margin: 0 0 2rem;
}
@media (min-width: 640px) {
  .glossary { grid-template-columns: auto 1fr; }
}
.glossary dt {
  font-weight: 700;
  color: var(--teal);
}
.glossary dd { margin: 0; color: var(--muted); font-size: 0.9375rem; }

.source-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.source-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.source-list a {
  color: var(--ink);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--teal);
}
.source-list a:hover { color: var(--teal); }
.source-note {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}
.link-ext { font-size: 0.85em; }

/* Footer */
.site-footer {
  padding: 2.5rem 1.25rem;
  padding-bottom: max(2.5rem, env(safe-area-inset-bottom, 0px));
  background: var(--ink);
  color: #A8B0B8;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.footer-brand { color: var(--paper); margin: 0 0 0.5rem; }
.footer-meta, .footer-copy {
  margin: 0.25rem 0;
  font-size: 0.875rem;
}

/* Section reveal */
@media (prefers-reduced-motion: no-preference) {
  .section.is-revealing .section-inner {
    animation: reveal 0.5s ease-out;
  }
}
@keyframes reveal {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Hero loop node pulse */
@media (prefers-reduced-motion: no-preference) {
  .hero-machine .loop-node[data-node="decide"] rect {
    animation: node-glow 4s ease-in-out infinite;
  }
}
@keyframes node-glow {
  0%, 100% { filter: none; }
  50% { filter: drop-shadow(0 0 4px rgba(47, 111, 106, 0.4)); }
}

@media (max-width: 480px) {
  .header-inner {
    position: relative;
    gap: 0.5rem;
  }
  .header-inner::after {
    content: "";
    position: absolute;
    top: 0;
    right: max(1rem, env(safe-area-inset-right, 0px));
    bottom: 0;
    width: 1.25rem;
    background: linear-gradient(to right, transparent, var(--paper));
    pointer-events: none;
  }
  .phase-tech {
    display: none;
  }
  .exercise-panel > .exercise-actions .btn-primary {
    flex: 1 1 100%;
    width: 100%;
    max-width: 100%;
  }
  .trace-ledger .trace-line {
    grid-template-columns: 1.15rem max-content minmax(0, 1fr);
    gap: 0.25rem;
  }
}

@media (max-width: 428px) {
  .brand-text { font-size: 0.85rem; }
}