/* ============================================================
   Margin — design tokens
   Academic utility palette. Warm paper + deep ink + ochre accent.
   ============================================================ */

:root,
[data-theme="light"] {
  /* Type */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.4vw, 3.25rem);

  /* Spacing 4px base */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Surfaces — warm paper */
  --color-bg: #f5efe3;
  --color-surface: #faf5ea;
  --color-surface-2: #fdfaf1;
  --color-surface-offset: #ece3d0;
  --color-divider: #d9cfba;
  --color-border: #c9bda3;

  /* Text — deep ink */
  --color-text: #1a1714;
  --color-text-muted: #5a4f40;
  --color-text-faint: #8a7d6a;
  --color-text-inverse: #fdfaf1;

  /* Accent — muted ochre / burnt sienna (the "margin pencil") */
  --color-primary: #8a4a1f;
  --color-primary-hover: #6b3812;
  --color-primary-active: #4f2909;
  --color-primary-highlight: #e7d3ba;

  /* Semantic */
  --color-success: #3e6b2a;
  --color-success-bg: #dee6cf;
  --color-error: #8a1f1f;
  --color-error-bg: #ecd1cc;
  --color-info-bg: #dce5e3;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 14px;
  --radius-full: 9999px;

  /* Motion */
  --transition-interactive: 160ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows — warm-toned */
  --shadow-sm: 0 1px 2px oklch(0.2 0.02 60 / 0.07);
  --shadow-md: 0 6px 18px oklch(0.2 0.02 60 / 0.09);
  --shadow-lg: 0 20px 40px oklch(0.2 0.02 60 / 0.12);

  /* Layout widths */
  --content-narrow: 640px;
  --content-default: 1080px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

[data-theme="dark"] {
  --color-bg: #141312;
  --color-surface: #1b1917;
  --color-surface-2: #201d1a;
  --color-surface-offset: #262320;
  --color-divider: #2f2b26;
  --color-border: #3a352e;

  --color-text: #ece4d3;
  --color-text-muted: #a19683;
  --color-text-faint: #6b6354;
  --color-text-inverse: #141312;

  --color-primary: #d88958;
  --color-primary-hover: #e59c6f;
  --color-primary-active: #f0af87;
  --color-primary-highlight: #3a2b1e;

  --color-success: #87b36b;
  --color-success-bg: #2a3522;
  --color-error: #d87878;
  --color-error-bg: #3b2624;
  --color-info-bg: #22302e;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 18px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 20px 40px oklch(0 0 0 / 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #141312;
    --color-surface: #1b1917;
    --color-surface-2: #201d1a;
    --color-surface-offset: #262320;
    --color-divider: #2f2b26;
    --color-border: #3a352e;
    --color-text: #ece4d3;
    --color-text-muted: #a19683;
    --color-text-faint: #6b6354;
    --color-text-inverse: #141312;
    --color-primary: #d88958;
    --color-primary-hover: #e59c6f;
    --color-primary-active: #f0af87;
    --color-primary-highlight: #3a2b1e;
  }
}

/* ============================================================
   Base reset
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  background-image:
    radial-gradient(ellipse 1200px 400px at 10% -10%, oklch(from var(--color-primary) l c h / 0.06), transparent 60%),
    radial-gradient(ellipse 800px 300px at 100% 10%, oklch(from var(--color-primary) l c h / 0.04), transparent 60%);
  background-attachment: fixed;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4 {
  text-wrap: balance;
  line-height: 1.15;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.01em;
}

p {
  text-wrap: pretty;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-primary-hover);
}

button {
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  padding: 0 0.25em;
  background: var(--color-surface-offset);
  border-radius: var(--radius-sm);
}

::selection {
  background: oklch(from var(--color-primary) l c h / 0.28);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

a,
button,
[role="button"],
input,
textarea,
select,
summary {
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}

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

.skip-link {
  position: absolute;
  top: 0;
  left: var(--space-4);
  background: var(--color-text);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  z-index: 100;
  text-decoration: none;
  font-weight: 600;
  transform: translateY(-110%);
  transition: transform 120ms ease;
}
.skip-link:focus {
  transform: translateY(var(--space-3));
}

/* ============================================================
   Layout primitives
   ============================================================ */
.container {
  width: min(100% - var(--space-8), var(--content-default));
  margin-inline: auto;
}

.container.wide {
  max-width: var(--content-wide);
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid oklch(from var(--color-border) l c h / 0.5);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
}
.brand-mark {
  color: var(--color-primary);
}
.brand-word {
  font-style: italic;
}

.nav-list {
  display: none;
  gap: var(--space-6);
  list-style: none;
}
.nav-list a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
}
.nav-list a:hover {
  color: var(--color-text);
}
@media (min-width: 720px) {
  .nav-list {
    display: flex;
  }
}

.icon-btn {
  min-width: 44px;
  min-height: 44px;
  display: inline-grid;
  place-items: center;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
}
.icon-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding-block: clamp(var(--space-10), 7vw, var(--space-20)) clamp(var(--space-12), 8vw, var(--space-24));
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  align-items: start;
}
@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  position: sticky;
  top: calc(var(--space-20));
}
@media (max-width: 959px) {
  .hero-copy {
    position: static;
  }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}
.pill {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-primary);
  font-size: 11px;
  letter-spacing: 0.06em;
  background: var(--color-surface);
}

h1.display {
  font-size: var(--text-2xl);
  font-weight: 400;
  line-height: 1.05;
  color: var(--color-text);
  max-width: 20ch;
}
h1.display em {
  font-style: italic;
  color: var(--color-primary);
  display: block;
  font-weight: 400;
}

.lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 42ch;
  line-height: 1.55;
}

.lede-alt {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 48ch;
}

.hero-trust {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-2);
}
.hero-trust li {
  position: relative;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.hero-trust li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 10px;
  height: 2px;
  background: var(--color-primary);
}
.hero-trust strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ============================================================
   Workbench — the actual tool
   ============================================================ */
.workbench {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: clamp(var(--space-5), 2vw, var(--space-8));
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  position: relative;
  overflow: hidden;
}
.workbench::before {
  /* Ruled margin line — conceptual nod to a notebook margin */
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 12px;
  width: 1px;
  background: oklch(from var(--color-primary) l c h / 0.22);
  pointer-events: none;
}

.step {
  border: none;
  padding: 0 0 0 var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.step + .step {
  padding-top: var(--space-5);
  border-top: 1px dashed var(--color-divider);
}

.step legend {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.01em;
  padding: 0;
}
.step-num {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  line-height: 1;
  flex: 0 0 auto;
}

.help-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Dropzone */
.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-align: center;
  padding: var(--space-10) var(--space-4);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  cursor: pointer;
  min-height: 176px;
}
.dropzone:hover,
.dropzone.is-drag {
  border-color: var(--color-primary);
  background: color-mix(in oklab, var(--color-primary-highlight) 50%, var(--color-surface-2));
  color: var(--color-text);
}
.dropzone.is-loaded {
  border-style: solid;
  border-color: var(--color-success);
  background: var(--color-success-bg);
  color: var(--color-text);
}
.dropzone-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
}
.dropzone-sub {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  font-weight: 600;
}
.link-like {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.status-text {
  min-height: 1.2em;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.status-text[data-tone="success"] {
  color: var(--color-success);
}
.status-text[data-tone="error"] {
  color: var(--color-error);
}

.paste-details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  padding: var(--space-3) var(--space-4);
}
.paste-details summary {
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.paste-details summary::-webkit-details-marker { display: none; }
.paste-details summary::before {
  content: "＋";
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--transition-interactive);
}
.paste-details[open] summary::before {
  content: "−";
}
.paste-details textarea {
  width: 100%;
  margin-top: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  resize: vertical;
  min-height: 120px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.55;
}
.paste-details textarea:focus-visible {
  border-color: var(--color-primary);
}

/* Form rows */
.field-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 520px) {
  .field-row {
    grid-template-columns: 1fr 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.field label,
.field-legend {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0;
}

.slider-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.slider-wrap input[type="range"] {
  flex: 1;
  appearance: none;
  height: 4px;
  background: var(--color-divider);
  border-radius: var(--radius-full);
  outline: none;
}
.slider-wrap input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  border: 2px solid var(--color-surface);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.slider-wrap input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  border: 2px solid var(--color-surface);
  cursor: pointer;
}
.slider-wrap output {
  min-width: 2.5ch;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--color-text);
}

select {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-2);
  color: var(--color-text);
  min-height: 44px;
  cursor: pointer;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none' stroke='%235a4f40' stroke-width='1.5'%3e%3cpath d='M1 1.5 6 6l5-4.5'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-10);
  appearance: none;
}
select:focus-visible {
  border-color: var(--color-primary);
}

.type-group,
.mode-group {
  border: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  min-height: 36px;
  user-select: none;
}
.chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.chip:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
}
.chip:has(input:checked) {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}
.chip:has(input:focus-visible) {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.radio-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}
.radio-card {
  display: block;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  cursor: pointer;
  position: relative;
}
.radio-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.radio-card:hover {
  border-color: var(--color-primary);
}
.radio-card:has(input:checked) {
  border-color: var(--color-primary);
  background: color-mix(in oklab, var(--color-primary-highlight) 60%, var(--color-surface-2));
  box-shadow: 0 0 0 1px var(--color-primary) inset;
}
.radio-card:has(input:focus-visible) {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}
.radio-card-title {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.radio-card-sub {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.toggle-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  cursor: pointer;
}
.toggle-row input {
  margin-top: 2px;
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  flex: 0 0 auto;
}
.toggle-title {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.toggle-sub {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* Step actions */
.step-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-2);
}

.btn-primary {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  min-height: 48px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  background: var(--color-primary-active);
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary[data-loading="true"] .btn-label {
  opacity: 0.7;
}
.btn-spin {
  display: none;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  border: 2px solid currentColor;
  border-top-color: transparent;
  animation: spin 0.8s linear infinite;
}
.btn-primary[data-loading="true"] .btn-spin {
  display: inline-block;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.step-actions-hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  min-height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 500;
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-surface);
}

/* ============================================================
   Results
   ============================================================ */
.results {
  padding-block: clamp(var(--space-8), 6vw, var(--space-16));
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
}

.results-header {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  align-items: end;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}
.results-header h2 {
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-top: var(--space-1);
}
.results-meta {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

.export-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.export-note {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  min-height: 1.2em;
}

.q-list {
  list-style: none;
  display: grid;
  gap: var(--space-4);
  counter-reset: q;
}

.q-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: grid;
  gap: var(--space-3);
  position: relative;
  counter-increment: q;
}
.q-card::before {
  content: counter(q, decimal-leading-zero);
  position: absolute;
  top: var(--space-4);
  right: var(--space-5);
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-text-faint);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

.q-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  font-size: var(--text-xs);
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-surface);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
  font-size: 11px;
}
.tag.type { color: var(--color-primary); border-color: var(--color-primary); }
.tag.bloom { color: var(--color-text-muted); }
.tag.confidence-extracted {
  background: var(--color-success-bg);
  border-color: var(--color-success);
  color: var(--color-success);
}
.tag.confidence-synthesized {
  background: var(--color-info-bg);
  color: var(--color-text-muted);
}

.q-stem {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
  padding-right: 3ch;
}

.choices {
  display: grid;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0;
}
.choice {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  font-size: var(--text-sm);
  line-height: 1.45;
}
.choice-letter {
  font-weight: 700;
  color: var(--color-text-muted);
  flex: 0 0 auto;
  font-variant-numeric: tabular-nums;
}
.choice.is-correct {
  border-color: var(--color-success);
  background: var(--color-success-bg);
  color: var(--color-text);
}
.choice.is-correct .choice-letter {
  color: var(--color-success);
}

.reveal-btn {
  align-self: start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px dashed var(--color-primary);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.reveal-btn:hover {
  background: var(--color-primary-highlight);
}

.answer {
  display: none;
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid var(--color-primary);
  background: color-mix(in oklab, var(--color-primary-highlight) 40%, var(--color-surface));
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--text-sm);
  color: var(--color-text);
}
.answer.is-visible {
  display: block;
}
.answer strong {
  color: var(--color-primary);
  font-weight: 700;
}

.citation {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.2);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  position: relative;
}
.citation::before {
  content: "“";
  font-family: var(--font-display);
  font-size: 2.5em;
  color: var(--color-primary);
  line-height: 0.8;
  flex: 0 0 auto;
}
.citation q {
  quotes: none;
}

.q-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-top: var(--space-1);
}
.q-flag {
  color: var(--color-text-faint);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  border-radius: var(--radius-sm);
}
.q-flag:hover {
  color: var(--color-error);
  background: var(--color-error-bg);
}
.q-flag.is-flagged {
  color: var(--color-error);
}

/* Cloze styling */
.cloze {
  padding: 0 var(--space-1);
  background: var(--color-primary-highlight);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.cloze.hidden-cloze {
  color: transparent;
  background: var(--color-text);
  cursor: pointer;
  user-select: none;
  border-radius: var(--radius-sm);
}
.cloze.hidden-cloze:hover,
.cloze.hidden-cloze:focus-visible {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* ============================================================
   How / Differentiators / FAQ
   ============================================================ */
.how {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
}
.how-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--space-6), 4vw, var(--space-12));
  align-items: start;
}
@media (min-width: 860px) {
  .how-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}
.how h2 {
  font-size: var(--text-xl);
  margin-top: var(--space-2);
  margin-bottom: var(--space-5);
  color: var(--color-text);
}

.how-steps {
  display: grid;
  gap: var(--space-6);
  list-style: none;
}
.how-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4) var(--space-5);
  align-items: baseline;
}
.step-badge {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-style: italic;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.how-steps h3 {
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-1);
  grid-column: 2;
}
.how-steps p {
  grid-column: 2;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  max-width: 58ch;
}

.diff {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
}
.diff h2 {
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-8);
  max-width: 22ch;
}

.diff-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.diff-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  min-width: 600px;
}
.diff-table th,
.diff-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-divider);
  vertical-align: middle;
}
.diff-table thead th {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
}
.diff-table thead th:first-child {
  border-top-left-radius: var(--radius-lg);
}
.diff-table thead th:last-child {
  border-top-right-radius: var(--radius-lg);
}
.diff-table tbody th {
  font-weight: 500;
  color: var(--color-text);
  width: 42%;
}
.diff-table tbody td {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-base);
  font-weight: 600;
}
.diff-table tbody td.yes {
  color: var(--color-primary);
}
.diff-table tbody td.partial {
  color: var(--color-text-muted);
}
.diff-table tbody tr:last-child td,
.diff-table tbody tr:last-child th {
  border-bottom: none;
}
.diff-legend {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.faq {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
}
.faq h2 {
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-6);
}
.faq-list {
  display: grid;
  gap: var(--space-3);
  max-width: 720px;
}
.faq details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  padding: var(--space-4) var(--space-5);
}
.faq details[open] {
  border-color: var(--color-primary);
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "＋";
  color: var(--color-primary);
  font-weight: 400;
  flex: 0 0 auto;
}
.faq details[open] summary::after {
  content: "−";
}
.faq details p {
  margin-top: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  padding-block: var(--space-10);
  border-top: 1px solid var(--color-divider);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
  align-items: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.footer-brand {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-text);
}
.footer-brand [aria-hidden] {
  color: var(--color-primary);
}

/* ============================================================
   Toasts
   ============================================================ */
.toast-wrap {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 50;
  pointer-events: none;
  max-width: calc(100vw - var(--space-10));
}
.toast {
  background: var(--color-text);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: var(--text-sm);
  font-weight: 500;
  pointer-events: auto;
  animation: toast-in 200ms ease-out both;
}
.toast.error {
  background: var(--color-error);
}
.toast.success {
  background: var(--color-success);
}
@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   Print
   ============================================================ */
@media print {
  .site-header,
  .hero-copy,
  .step-actions,
  .export-bar,
  .export-note,
  .q-actions,
  .how,
  .diff,
  .faq,
  .site-footer,
  .toast-wrap,
  .reveal-btn {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .workbench,
  .q-card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
  .answer { display: block !important; }
}