/* Hallmark · pre-emit critique: P5 H5 E5 S5 R4 V5
 * macrostructure: Split Studio · genre: modern-minimal · tone: luxury/minimal
 * nav: N9 Edge-aligned minimal · footer: Ft5 Statement
 * theme: custom (tuned) · vibe: "expensive, quiet, instrument-grade"
 *   paper  oklch(96.5% 0.005 95)
 *   accent oklch(52% 0.105 58) copper · on deep oklch(66% 0.120 58)
 *          one hue (58) across light + deep; deep variant lightened
 *          so it clears 4.5:1 on the instrument as both text and button
 *   axes:  light / fine-sans / warm-metal
 * enrichment: the instrument (Tier-A, hand-built, functional — no re-drawn chrome)
 * gate 1 deviation: system stack used deliberately — artifact CSP blocks font CDNs and
 *   the only local faces are licensed (Farnham, Apple SF). Production face: Switzer
 *   (Fontshare, free commercial), self-hosted. See handoff notes.
 */

:root {
  /* ---- surfaces (chroma floor 0.005, warm bias) ---- */
  --color-paper:      oklch(96.5% 0.005 95);
  --color-paper-2:    oklch(93.2% 0.006 95);
  --color-paper-3:    oklch(89.5% 0.006 95);

  /* ---- ink (all pass 4.5:1 on paper) ---- */
  --color-ink:        oklch(21% 0.010 265);
  --color-ink-2:      oklch(42% 0.010 265);
  --color-ink-3:      oklch(52% 0.008 265);

  /* ---- the instrument: deliberately deep in both themes ---- */
  --color-inst:       oklch(19% 0.012 265);
  --color-inst-2:     oklch(25% 0.012 265);
  --color-inst-3:     oklch(32% 0.011 265);
  --color-inst-ink:   oklch(96% 0.006 95);
  --color-inst-ink-2: oklch(84% 0.008 265);
  --color-inst-ink-3: oklch(74% 0.008 265);
  --color-inst-ink-4: oklch(66% 0.008 265);   /* placeholders only */
  --color-inst-rule:  oklch(34% 0.011 265);

  /* ---- accent: copper, one hue (58) across light + deep ---- */
  --color-accent:         oklch(52% 0.105 58);   /* 5.0:1 on paper   */
  --color-accent-on-deep: oklch(66% 0.120 58);   /* 6.2:1 on inst,
                                                    and as button bg
                                                    vs inst text     */
  --color-focus:          oklch(52% 0.130 58);

  --color-rule:       oklch(87.5% 0.006 95);
  --color-rule-soft:  oklch(91.5% 0.006 95);

  --shadow-inst: 0 1px 2px oklch(12% 0.01 265 / 0.14), 0 14px 38px oklch(12% 0.01 265 / 0.16);

  /* ---- type ---- */
  --font-display: "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --font-body:    "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --font-mono:    ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --text-display: clamp(2.6rem, 6.1vw + 0.25rem, 5.25rem);
  --text-2xl:     clamp(1.9rem, 3.1vw + 0.4rem, 2.9rem);
  --text-xl:      clamp(1.4rem, 1.5vw + 0.6rem, 1.8rem);
  --text-lg:      1.1875rem;
  --text-base:    1.0625rem;
  --text-sm:      0.9375rem;
  --text-xs:      0.8125rem;
  --text-2xs:     0.6875rem;

  /* ---- space: 4pt scale ---- */
  --space-2xs: 0.25rem;
  --space-xs:  0.5rem;
  --space-sm:  0.75rem;
  --space-md:  1.25rem;
  --space-lg:  2rem;
  --space-xl:  3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;

  /* ---- motion: slow ---- */
  --dur-short: 180ms;
  --dur-mid:   420ms;
  --dur-slow:  760ms;
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:     cubic-bezier(0.7, 0, 0.84, 0);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  --rule-hair: 1px;
  --radius-sm: 3px;
  --radius-md: 5px;

  --z-nav: 40;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-paper:      oklch(15.5% 0.010 265);
    --color-paper-2:    oklch(19.5% 0.011 265);
    --color-paper-3:    oklch(24% 0.011 265);
    --color-ink:        oklch(95% 0.006 95);
    --color-ink-2:      oklch(76% 0.008 265);
    --color-ink-3:      oklch(62% 0.008 265);
    --color-inst:       oklch(24% 0.013 265);
    --color-inst-2:     oklch(29% 0.013 265);
    --color-inst-3:     oklch(35% 0.012 265);
    --color-inst-ink-2: oklch(86% 0.008 265);
    --color-inst-ink-3: oklch(78% 0.008 265);
    --color-inst-ink-4: oklch(69% 0.008 265);
    --color-inst-rule:  oklch(42% 0.012 265);
    --color-accent:         oklch(72% 0.120 58);
    --color-accent-on-deep: oklch(72% 0.120 58);
    --color-focus:          oklch(74% 0.130 58);
    --color-rule:       oklch(29% 0.010 265);
    --color-rule-soft:  oklch(23% 0.010 265);
    --shadow-inst: 0 1px 2px oklch(0% 0 0 / 0.30), 0 14px 38px oklch(0% 0 0 / 0.26);
  }
}

:root[data-theme="dark"] {
  --color-paper:      oklch(15.5% 0.010 265);
  --color-paper-2:    oklch(19.5% 0.011 265);
  --color-paper-3:    oklch(24% 0.011 265);
  --color-ink:        oklch(95% 0.006 95);
  --color-ink-2:      oklch(76% 0.008 265);
  --color-ink-3:      oklch(62% 0.008 265);
  --color-inst:       oklch(24% 0.013 265);
  --color-inst-2:     oklch(29% 0.013 265);
  --color-inst-3:     oklch(35% 0.012 265);
  --color-inst-ink-2: oklch(86% 0.008 265);
  --color-inst-ink-3: oklch(78% 0.008 265);
  --color-inst-ink-4: oklch(69% 0.008 265);
  --color-inst-rule:  oklch(42% 0.012 265);
  --color-accent:         oklch(72% 0.120 58);
  --color-accent-on-deep: oklch(72% 0.120 58);
  --color-focus:          oklch(74% 0.130 58);
  --color-rule:       oklch(29% 0.010 265);
  --color-rule-soft:  oklch(23% 0.010 265);
  --shadow-inst: 0 1px 2px oklch(0% 0 0 / 0.30), 0 14px 38px oklch(0% 0 0 / 0.26);
}

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

html, body { overflow-x: clip; }

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.shell {
  max-width: 78rem;
  margin: 0 auto;
  padding-inline: clamp(1.25rem, 5vw, 4rem);
}

/* ============ nav · N9 edge-aligned minimal ============ */

.nav {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: color-mix(in oklab, var(--color-paper) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: var(--rule-hair) solid var(--color-rule-soft);
}
.nav-in {
  max-width: 78rem;
  margin: 0 auto;
  padding: var(--space-md) clamp(1.25rem, 5vw, 4rem);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
}
.wordmark {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  letter-spacing: -0.025em;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}
.wordmark b { font-weight: 600; }
.nav-right {
  display: flex;
  align-items: baseline;
  gap: clamp(var(--space-md), 3vw, var(--space-xl));
}
.nav-link {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-short) var(--ease-out);
}
.nav-link:hover { color: var(--color-ink); }
.nav-link:active { color: var(--color-accent); }

/* ============ type ============ */

h1, h2, h3 {
  font-family: var(--font-display);
  font-style: normal;
  margin: 0;
  overflow-wrap: anywhere;
  min-width: 0;
  text-wrap: balance;
}
h1 { font-size: var(--text-display); font-weight: 300; letter-spacing: -0.018em; line-height: 1.04; }
h2 { font-size: var(--text-2xl); font-weight: 350; letter-spacing: -0.014em; line-height: 1.12; }
h3 { font-size: var(--text-xl); font-weight: 450; letter-spacing: -0.008em; line-height: 1.24; }
p { margin: 0; }

.lede {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink-2);
  max-width: 46ch;
  font-weight: 300;
}
.body-copy { color: var(--color-ink-2); max-width: 54ch; }
.body-copy + .body-copy { margin-top: var(--space-md); }

.label {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-3);
}

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

/* ============ split studio · diptych ============ */

.dip {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(var(--space-lg), 5vw, var(--space-2xl));
  align-items: start;
}
.dip.is-reversed .dip-text { order: 2; }

/* ============ hero ============ */

.hero { padding-block: var(--space-2xl) clamp(var(--space-2xl), 9vw, var(--space-3xl)); }
.hero .dip { align-items: start; }
.results .prompt-list { max-height: 21rem; overflow-y: auto; }
.hero-text { display: flex; flex-direction: column; gap: var(--space-lg); }
.hero h1 { max-width: 13ch; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-md);
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-3);
}
.hero-meta span { white-space: nowrap; }
.sep { width: 3px; height: 3px; border-radius: 50%; background: var(--color-accent); display: inline-block; }

/* ============ the instrument ============ */

.inst {
  background: var(--color-inst);
  color: var(--color-inst-ink);
  border: var(--rule-hair) solid var(--color-inst-rule);
  border-radius: var(--radius-md);
  padding: clamp(var(--space-md), 2.6vw, var(--space-lg));
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  box-shadow: var(--shadow-inst);
}
.inst-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: var(--rule-hair) solid var(--color-inst-rule);
}
.inst-title {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-inst-ink-2);
}
.inst-state {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  color: var(--color-accent-on-deep);
  white-space: nowrap;
}

.field-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-sm); }
.field { display: flex; flex-direction: column; gap: var(--space-2xs); min-width: 0; }
.field.is-wide { grid-column: 1 / -1; }
.field label {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-inst-ink-3);
}
.field input {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-inst-ink);
  background: var(--color-inst-2);
  border: var(--rule-hair) solid var(--color-inst-rule);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
  width: 100%;
  min-width: 0;
  min-height: 44px;
  transition: border-color var(--dur-short) var(--ease-out),
              background-color var(--dur-short) var(--ease-out);
}
.field input::placeholder { color: var(--color-inst-ink-4); }
.field input:hover { border-color: var(--color-inst-3); }
.field input:focus { background: var(--color-inst-3); border-color: var(--color-accent-on-deep); outline: none; }
.field input:focus-visible { outline: 2px solid var(--color-accent-on-deep); outline-offset: 2px; }
.field input:disabled { opacity: 0.45; cursor: not-allowed; }
.field input[aria-invalid="true"] { border-color: var(--color-accent-on-deep); }

.btn {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  border-radius: 999px;
  padding: var(--space-sm) var(--space-md);
  border: var(--rule-hair) solid transparent;
  cursor: pointer;
  min-height: 44px;
  transition: background-color var(--dur-short) var(--ease-out),
              color var(--dur-short) var(--ease-out),
              border-color var(--dur-short) var(--ease-out),
              transform var(--dur-short) var(--ease-out);
}
.btn-primary { background: var(--color-accent-on-deep); color: var(--color-inst); }
.btn-primary:hover { background: var(--color-inst-ink); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:disabled { opacity: 0.42; cursor: not-allowed; }
.btn-primary:disabled:hover { background: var(--color-accent-on-deep); }

.btn-page { background: var(--color-ink); color: var(--color-paper); text-decoration: none; display: inline-block; }
.btn-page:hover { background: var(--color-accent); }
.btn-page:active { transform: translateY(1px); }

.btn-ghost { background: transparent; color: var(--color-ink); border-color: var(--color-rule); text-decoration: none; display: inline-block; }
.btn-ghost:hover { border-color: var(--color-ink); }
.btn-ghost:active { transform: translateY(1px); }

.cta-row { display: flex; flex-wrap: wrap; gap: var(--space-sm); align-items: center; }

/* results */
.results { display: flex; flex-direction: column; gap: var(--space-xs); }
.results[hidden] { display: none; }
.result-note { font-size: var(--text-xs); color: var(--color-inst-ink-3); line-height: 1.55; }
.result-note b { color: var(--color-inst-ink); font-weight: 500; }
.prompt-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.prompt {
  display: grid;
  grid-template-columns: 1.6rem minmax(0, 1fr) auto;
  gap: var(--space-sm);
  align-items: start;
  padding: var(--space-sm) 0;
  border-bottom: var(--rule-hair) solid var(--color-inst-rule);
}
.prompt-n {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--color-inst-ink-3);
  font-variant-numeric: tabular-nums;
  padding-top: var(--space-2xs);
}
.prompt-q { font-size: var(--text-sm); line-height: 1.5; color: var(--color-inst-ink); min-width: 0; overflow-wrap: anywhere; }
.copy {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: transparent;
  color: var(--color-inst-ink-3);
  border: var(--rule-hair) solid var(--color-inst-rule);
  border-radius: var(--radius-sm);
  padding: var(--space-2xs) var(--space-xs);
  cursor: pointer;
  white-space: nowrap;
  min-height: 32px;
  transition: color var(--dur-short) var(--ease-out),
              border-color var(--dur-short) var(--ease-out);
}
.copy:hover { color: var(--color-inst-ink); border-color: var(--color-inst-3); }
.copy:active { transform: translateY(1px); }
.copy:disabled { opacity: 0.42; cursor: not-allowed; }
.copy[data-copied="true"] { color: var(--color-accent-on-deep); border-color: var(--color-accent-on-deep); }

.scoring { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-xs); padding-top: var(--space-xs); }
.score-cell { background: var(--color-inst-2); border-radius: var(--radius-sm); padding: var(--space-sm); display: flex; flex-direction: column; gap: var(--space-2xs); min-width: 0; }
.score-k { font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent-on-deep); }
.score-v { font-size: var(--text-xs); color: var(--color-inst-ink-2); line-height: 1.45; }

/* ============ sections ============ */

section { padding-block: clamp(var(--space-2xl), 8vw, var(--space-3xl)); }
.section-head { display: flex; flex-direction: column; gap: var(--space-sm); max-width: 26ch; }
.rule-top { border-top: var(--rule-hair) solid var(--color-rule); }

.thesis { padding-block: clamp(var(--space-xl), 6vw, var(--space-2xl)); }
.thesis-line {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw + 0.4rem, 2.7rem);
  font-weight: 300;
  letter-spacing: -0.014em;
  line-height: 1.24;
  max-width: 26ch;
  text-wrap: balance;
}
.thesis-line em { font-style: normal; color: var(--color-accent); }

.detect { display: flex; flex-direction: column; }
.detect-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-md);
  align-items: baseline;
  padding: var(--space-sm) 0;
  border-bottom: var(--rule-hair) solid var(--color-rule-soft);
}
.detect-name { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink); overflow-wrap: anywhere; }
.detect-owner { font-size: var(--text-xs); color: var(--color-ink-3); white-space: nowrap; }

.compare { display: flex; flex-direction: column; }
.compare-row {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  border-bottom: var(--rule-hair) solid var(--color-rule-soft);
  align-items: baseline;
}
.compare-row.is-head { border-bottom-color: var(--color-rule); }
.compare-row.is-head span { font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-ink-3); }
.compare-k { font-size: var(--text-sm); color: var(--color-ink); min-width: 0; }
.compare-v { font-size: var(--text-sm); color: var(--color-ink-3); min-width: 0; }
.compare-v.is-yes { color: var(--color-accent); }

.spine { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-md); }
.spine-item { display: flex; flex-direction: column; gap: var(--space-xs); padding-top: var(--space-sm); border-top: 2px solid var(--color-ink); min-width: 0; }
.spine-k { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 300; letter-spacing: -0.02em; }
.spine-v { font-size: var(--text-xs); color: var(--color-ink-2); line-height: 1.55; }

.audit-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.audit-list li { padding: var(--space-sm) 0; border-bottom: var(--rule-hair) solid var(--color-rule-soft); font-size: var(--text-sm); color: var(--color-ink-2); }

/* ============ footer · Ft5 statement ============ */

.foot { border-top: var(--rule-hair) solid var(--color-rule); padding-block: var(--space-2xl) var(--space-xl); }
.foot-statement {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw + 0.3rem, 2.4rem);
  font-weight: 300;
  letter-spacing: -0.014em;
  line-height: 1.2;
  max-width: 26ch;
  text-wrap: balance;
}
.foot-meta {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: var(--rule-hair) solid var(--color-rule-soft);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  align-items: baseline;
  font-size: var(--text-xs);
  color: var(--color-ink-3);
}
.foot-meta a { color: var(--color-ink-2); text-decoration: none; white-space: nowrap; }
.foot-meta a:hover { color: var(--color-accent); }
.foot-meta a.is-lead { color: var(--color-accent); }
.foot-meta a.is-lead:hover { color: var(--color-ink); }
.foot-name { color: var(--color-ink-3); }

/* ============ one orchestrated entrance ============ */

@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(12px); animation: rise var(--dur-slow) var(--ease-out) forwards; }
  .reveal:nth-child(1) { animation-delay: 60ms; }
  .reveal:nth-child(2) { animation-delay: 180ms; }
  .reveal:nth-child(3) { animation-delay: 300ms; }
  .hero .inst { opacity: 0; transform: translateY(16px); animation: rise var(--dur-slow) var(--ease-out) 380ms forwards; }
}
@keyframes rise { to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal, .hero .inst { opacity: 1; transform: none; }
}

/* ============ responsive ============ */

@media (max-width: 60rem) {
  .dip { grid-template-columns: minmax(0, 1fr); gap: var(--space-xl); }
  .dip.is-reversed .dip-text { order: 0; }
  .spine { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .compare-row { grid-template-columns: minmax(0, 1fr); gap: var(--space-2xs); }
  .compare-row.is-head { display: none; }
  .compare-v::before { content: attr(data-k) " \2014 "; color: var(--color-ink-3); font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.1em; text-transform: uppercase; }
  .section-head { max-width: 34ch; }
}

@media (max-width: 40rem) {
  .field-grid { grid-template-columns: minmax(0, 1fr); }
  .scoring { grid-template-columns: minmax(0, 1fr); }
  .spine { grid-template-columns: minmax(0, 1fr); }
  .nav-right { gap: var(--space-md); }
  .nav-link.is-optional { display: none; }
  .prompt { grid-template-columns: 1.4rem minmax(0, 1fr); }
  .prompt .copy { grid-column: 2; justify-self: start; }
  .inst-head { flex-direction: column; align-items: flex-start; gap: var(--space-2xs); }
  .inst-title, .inst-state { white-space: nowrap; }
  .cta-row .btn { width: 100%; text-align: center; }
}

/* ============ footer mailing list (carries GF form 1 -> Constant Contact) ============ */

.foot-signup {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: var(--rule-hair) solid var(--color-rule-soft);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: var(--space-md) var(--space-xl);
  align-items: start;
}
.foot-signup-k {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  letter-spacing: -0.008em;
  line-height: 1.24;
  color: var(--color-ink);
}
.foot-signup-v { font-size: var(--text-sm); color: var(--color-ink-2); margin-top: var(--space-2xs); max-width: 46ch; }

.foot-signup .gform_wrapper { margin: 0; }
.foot-signup .gform_wrapper .gform_fields { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-sm); }
.foot-signup .gform_wrapper .gfield_label,
.foot-signup .gform_wrapper legend {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-3);
  font-weight: 400;
}
.foot-signup .gform_wrapper input:not([type=submit]):not([type=button]) {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-ink);
  background: var(--color-paper-2);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
  width: 100%;
  min-width: 0;
  min-height: 44px;
  transition: border-color var(--dur-short) var(--ease-out);
}
.foot-signup .gform_wrapper input:not([type=submit]):hover { border-color: var(--color-rule-strong, var(--color-ink-3)); }
.foot-signup .gform_wrapper input:not([type=submit]):focus { border-color: var(--color-accent); outline: none; }
.foot-signup .gform_wrapper input:not([type=submit]):focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.foot-signup .gform_wrapper .gform_required_legend {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-3);
  margin: 0 0 var(--space-sm);
}
.foot-signup .gform_wrapper .gform-field-label--type-sub,
.foot-signup .gform_wrapper .ginput_complex label {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-3);
  font-weight: 400;
}
.foot-signup .gform_wrapper input[type=submit],
.foot-signup .gform_wrapper button[type=submit],
.foot-signup .gform_wrapper .gform_button {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  background: var(--color-accent);
  color: var(--color-paper);
  border: 0;
  border-radius: 999px;
  padding: var(--space-sm) var(--space-md);
  min-height: 44px;
  cursor: pointer;
  transition: background-color var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out);
}
.foot-signup .gform_wrapper input[type=submit]:hover,
.foot-signup .gform_wrapper .gform_button:hover { background: var(--color-ink); }
.foot-signup .gform_wrapper input[type=submit]:active,
.foot-signup .gform_wrapper .gform_button:active { transform: translateY(1px); }
.foot-signup .gform_wrapper input[type=submit]:disabled,
.foot-signup .gform_wrapper .gform_button:disabled { opacity: 0.42; cursor: not-allowed; }
.foot-signup .gform_wrapper .gfield_required { color: var(--color-accent); }
.foot-signup .gform_wrapper .gform_validation_errors,
.foot-signup .gform_wrapper .validation_message,
.foot-signup .gform_wrapper .gfield_validation_message { color: var(--color-accent); font-size: var(--text-xs); }
.foot-signup .gform_confirmation_message { color: var(--color-ink); font-size: var(--text-sm); }
.foot-signup .gform_wrapper .gform_footer { margin: var(--space-sm) 0 0; padding: 0; }

@media (max-width: 60rem) {
  .foot-signup { grid-template-columns: minmax(0, 1fr); }
}

/* skip link */
.fos-skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--color-ink); color: var(--color-paper);
  padding: var(--space-sm) var(--space-md); font-size: var(--text-sm);
  text-decoration: none; border-radius: 0 0 var(--radius-sm) 0;
}
.fos-skip:focus { left: 0; }

/* ============================================================================
   Divi override guard.
   Divi 5 prints its core + customizer CSS INLINE in wp_head, which lands after
   this stylesheet in document order. Its element-level rules (body, h1-h6)
   would therefore win on order alone. These scope-bumped duplicates carry a
   class, so they win on specificity no matter where Divi's CSS lands.
   Only needed on WordPress — the standalone prototype does not use this block.
   ========================================================================= */

body.fos-home {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.62;
  color: var(--color-ink);
  background: var(--color-paper);
}
body.fos-home h1,
body.fos-home h2,
body.fos-home h3 {
  font-family: var(--font-display);
  color: var(--color-ink);
  padding-bottom: 0;
  margin: 0;
}
body.fos-home h1 { font-weight: 300; letter-spacing: -0.018em; line-height: 1.04; }
body.fos-home h2 { font-weight: 350; letter-spacing: -0.014em; line-height: 1.12; }
body.fos-home h3 { font-weight: 450; letter-spacing: -0.008em; line-height: 1.24; }
body.fos-home p { margin: 0; }
/* Link colours are per-component here; a blanket `a` guard would out-specify
   the component classes and repaint the wordmark and nav. */
body.fos-home .wordmark { color: var(--color-ink); }
body.fos-home .nav-link { color: var(--color-ink-2); }
body.fos-home .nav-link:hover { color: var(--color-ink); }
body.fos-home .btn-page { color: var(--color-paper); }
body.fos-home .btn-ghost { color: var(--color-ink); }
body.fos-home .foot-meta a { color: var(--color-ink-2); }
body.fos-home .foot-meta a:hover { color: var(--color-accent); }
body.fos-home .foot-meta a.is-lead { color: var(--color-accent); }
body.fos-home .foot-meta a.is-lead:hover { color: var(--color-ink); }
body.fos-home button,
body.fos-home input,
body.fos-home select,
body.fos-home textarea { font-family: var(--font-body); }
body.fos-home .wordmark,
body.fos-home .spine-k,
body.fos-home .thesis-line,
body.fos-home .foot-statement,
body.fos-home .foot-signup-k { font-family: var(--font-display); }
body.fos-home .label,
body.fos-home .hero-meta,
body.fos-home .inst-title,
body.fos-home .inst-state,
body.fos-home .field label,
body.fos-home .prompt-n,
body.fos-home .copy,
body.fos-home .score-k,
body.fos-home .detect-name,
body.fos-home .compare-row.is-head span { font-family: var(--font-mono); }

/* ============ post index (homepage -> blog) ============ */

.post-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.post-item { border-bottom: var(--rule-hair) solid var(--color-rule-soft); }
.post-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-md);
  align-items: baseline;
  padding: var(--space-sm) 0;
  text-decoration: none;
  color: var(--color-ink);
  transition: color var(--dur-short) var(--ease-out);
}
.post-link:hover { color: var(--color-accent); }
.post-link:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; border-radius: var(--radius-sm); }
.post-link:active { color: var(--color-accent); }
.post-title { font-size: var(--text-sm); line-height: 1.45; min-width: 0; overflow-wrap: anywhere; }
.post-date {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-3);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

/* Divi override guard — same reason as the block above */
body.fos-home .post-link { color: var(--color-ink); }
body.fos-home .post-link:hover { color: var(--color-accent); }
body.fos-home .post-date { font-family: var(--font-mono); color: var(--color-ink-3); }
body.fos-home .post-title { font-family: var(--font-body); }

/* ============================================================================
   Blog index + single post
   ========================================================================= */

.page-head { padding-block: var(--space-2xl) var(--space-xl); }
.page-head h1 { font-size: var(--text-2xl); }

.archive { padding-block: var(--space-xl) var(--space-3xl); }
.post-list.is-archive .post-link { padding: var(--space-md) 0; }
.post-list.is-archive .post-title { font-size: var(--text-lg); line-height: 1.35; }
.archive-count {
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-3);
}

/* ---- article ---- */

.article-head { padding-block: var(--space-2xl) var(--space-lg); }
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs) var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-3);
  margin-bottom: var(--space-md);
}
.article-meta a { color: var(--color-ink-2); text-decoration: none; white-space: nowrap; }
.article-meta a:hover { color: var(--color-accent); }
.article-head h1 { font-size: clamp(2.1rem, 4.2vw + 0.4rem, 3.4rem); max-width: 20ch; }

.article-body {
  max-width: 68ch;
  padding-bottom: var(--space-xl);
  font-size: var(--text-lg);
  line-height: 1.72;
  color: var(--color-ink-2);
}
.article-body > * + * { margin-top: var(--space-md); }
.article-body h2 {
  font-size: clamp(1.5rem, 1.6vw + 0.9rem, 1.95rem);
  font-weight: 400;
  letter-spacing: -0.012em;
  line-height: 1.22;
  color: var(--color-ink);
  margin-top: var(--space-xl);
}
.article-body h3 {
  font-size: var(--text-xl);
  font-weight: 500;
  letter-spacing: -0.006em;
  line-height: 1.3;
  color: var(--color-ink);
  margin-top: var(--space-lg);
}
.article-body p { margin: 0; }
.article-body strong { color: var(--color-ink); font-weight: 600; }
.article-body a { color: var(--color-accent); text-underline-offset: 2px; }
.article-body a:hover { color: var(--color-ink); }
/* NB: never `display: flex` on a list — it blockifies the items and the
   markers vanish. Space the items with margin instead. */
.article-body ul,
.article-body ol { margin: var(--space-md) 0 0; padding-left: 1.3rem; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { line-height: 1.65; display: list-item; }
.article-body li + li { margin-top: var(--space-xs); }
.article-body li::marker { color: var(--color-ink-3); }
.article-body blockquote {
  margin: var(--space-lg) 0 0;
  padding: 0 0 0 var(--space-md);
  border-left: 2px solid var(--color-accent);
  font-size: var(--text-xl);
  line-height: 1.45;
  color: var(--color-ink);
  letter-spacing: -0.006em;
}
.article-body blockquote p { margin: 0; }
.article-body code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--color-paper-2);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  color: var(--color-ink);
}
.article-body hr { border: 0; border-top: var(--rule-hair) solid var(--color-rule); margin: var(--space-xl) 0 0; }
.article-body img { max-width: 100%; height: auto; border-radius: var(--radius-sm); }

/* ---- the authored blocks inside posts ---- */

.article-body .sumner-ai-summary,
.article-body .sumner-ai-llm-summary,
.article-body .sumner-ai-faq-top {
  margin-top: var(--space-xl);
  padding: var(--space-md) 0 0;
  border-top: 2px solid var(--color-ink);
}
.article-body .sumner-ai-summary h2,
.article-body .sumner-ai-llm-summary h2,
.article-body .sumner-ai-faq-top h2 {
  margin-top: 0;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-3);
}
.article-body .sumner-ai-summary ul,
.article-body .sumner-ai-llm-summary ul { margin-top: var(--space-sm); }
.article-body .sumner-ai-faq-top h3 {
  font-size: var(--text-lg);
  font-weight: 500;
  margin-top: var(--space-md);
}
.article-body .sumner-ai-faq-top p { margin-top: var(--space-2xs); font-size: var(--text-base); }

/* ---- end-of-post block ---- */

.article-close {
  max-width: 68ch;
  padding: var(--space-md) 0 var(--space-2xl);
  border-top: 2px solid var(--color-ink);
}
.article-byline {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-3);
}
.article-byline-v { margin-top: var(--space-xs); color: var(--color-ink-2); max-width: 54ch; }

/* ---- Divi override guard ---- */

body.fos-home .article-body,
body.fos-home .article-body p,
body.fos-home .article-body li { font-family: var(--font-body); color: var(--color-ink-2); }
body.fos-home .article-body h2,
body.fos-home .article-body h3,
body.fos-home .article-body strong { color: var(--color-ink); }
body.fos-home .article-body h2,
body.fos-home .article-body h3 { font-family: var(--font-display); padding-bottom: 0; }
body.fos-home .article-body a { color: var(--color-accent); }
body.fos-home .article-body a:hover { color: var(--color-ink); }
body.fos-home .article-head h1 { font-family: var(--font-display); color: var(--color-ink); }
body.fos-home .article-meta a { color: var(--color-ink-2); }
body.fos-home .article-meta a:hover { color: var(--color-accent); }
body.fos-home .article-body .sumner-ai-summary h2,
body.fos-home .article-body .sumner-ai-llm-summary h2,
body.fos-home .article-body .sumner-ai-faq-top h2 { font-family: var(--font-mono); color: var(--color-ink-3); }
body.fos-home .archive-count { font-family: var(--font-mono); color: var(--color-ink-3); }
body.fos-home .article-byline { font-family: var(--font-mono); color: var(--color-ink-3); }

@media (max-width: 40rem) {
  .article-body { font-size: var(--text-base); }
  .post-list.is-archive .post-link { grid-template-columns: minmax(0, 1fr); gap: var(--space-2xs); }
}

/* Gravity Forms' base stylesheet resets `ul { list-style: none }` globally;
   restore it inside article prose. */
body.fos-home .article-body ul { list-style: disc; }
body.fos-home .article-body ol { list-style: decimal; }
body.fos-home .article-body li { display: list-item; }
body.fos-home .article-body li::marker { color: var(--color-ink-3); }