/* ============================================================
   Suede Labs AI — flagship institutional surface
   Grammar: prospectus. Ink bands, cream paper, hairline rules,
   serif display, mono ledger data. Cyan is semantic only (live).
   ============================================================ */

:root {
  /* ink — suedeai.ai --g-ink #20201d, warm iron-gall black */
  --ink: #20201d;
  --ink-2: #2a2a26;
  --ink-deep: #191916;

  /* paper — suedeai.ai --g-bg #fbfaf5 and --g-surface-2 #f0eadb */
  --paper: #fbfaf5;
  --paper-deep: #f0eadb;

  /* text */
  --text-ink: #20201d;                       /* on paper (--g-ink) */
  --text-ink-2: #3f3d37;                     /* secondary on paper (--g-ink-soft) */
  --text-paper: #f0eadb;                     /* parchment on ink */
  --text-paper-2: rgba(240, 234, 219, 0.62); /* secondary on ink */

  /* semantic: live/verified — suedeai.ai olive system --g-accent #5f7800 */
  --live: #b4cc6a;                           /* olive lifted for ink surfaces */
  --live-paper: #5f7800;                     /* --g-accent, on paper */
  --accent-deep: #4f6500;                    /* --g-accent-deep */
  --accent-soft: #eef3cf;                    /* --g-accent-soft wash */

  /* rules */
  --rule-paper: rgba(32, 32, 29, 0.14);
  --rule-ink: rgba(240, 234, 219, 0.13);

  /* type */
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "Hanken Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, monospace;

  --text-xs: clamp(0.72rem, 0.69rem + 0.15vw, 0.8rem);
  --text-sm: clamp(0.875rem, 0.82rem + 0.28vw, 1rem);
  --text-base: clamp(1rem, 0.94rem + 0.3vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.62vw, 1.375rem);
  --text-xl: clamp(1.375rem, 1.1rem + 1.4vw, 2rem);
  --text-2xl: clamp(1.9rem, 1.35rem + 2.4vw, 3.25rem);
  --text-3xl: clamp(2.6rem, 1.7rem + 4.2vw, 5.25rem);

  /* rhythm */
  --space-band: clamp(5rem, 4rem + 6vw, 10rem);
  --container: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);

  /* motion */
  --ease-exit: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- accessibility ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--text-paper);
  padding: 0.6rem 1rem;
  z-index: 100;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--live-paper);
  outline-offset: 3px;
}
.band-ink :focus-visible,
.band-ink-deep :focus-visible { outline-color: var(--live); }

/* ---------- bands ---------- */
.band-ink { background: var(--ink); color: var(--text-paper); }
.band-ink-deep { background: var(--ink-deep); color: var(--text-paper); }
.band-paper { background: var(--paper); color: var(--text-ink); }
.band-paper-deep {
  background: var(--paper-deep);
  color: var(--text-ink);
  border-top: 1px solid var(--rule-paper);
  border-bottom: 1px solid var(--rule-paper);
}

.section { padding-block: var(--space-band); }

/* ---------- masthead ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(32, 32, 29, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule-ink);
}
.masthead-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 0.85rem var(--gutter);
  display: flex;
  align-items: center;
  gap: 2rem;
}
.masthead-mark {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-paper);
  margin-right: auto;
}
.masthead-mark img { width: 34px; height: 34px; }
.masthead-word {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: 0;
  white-space: nowrap;
}
.masthead-ai { opacity: 0.55; font-style: italic; }
.masthead-nav { display: flex; gap: 1.6rem; }
.masthead-nav a {
  color: var(--text-paper-2);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  padding-block: 0.35rem;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease-exit), border-color 180ms var(--ease-exit);
}
.masthead-nav a:hover { color: var(--text-paper); border-bottom-color: var(--live); }

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  padding: 0.85rem 1.6rem;
  border: 1px solid transparent;
  transition: transform 220ms var(--ease-exit), background-color 180ms var(--ease-exit),
    color 180ms var(--ease-exit), border-color 180ms var(--ease-exit);
}
.btn:hover { transform: translate3d(0, -2px, 0); }
.btn-solid { background: var(--paper); color: var(--ink); }
.btn-solid:hover { background: #fffef9; }
.btn-line {
  border-color: rgba(240, 234, 219, 0.4);
  color: var(--text-paper);
  white-space: nowrap;
}
.btn-line:hover { border-color: var(--text-paper); }
.btn-quiet { color: var(--text-paper-2); padding-inline: 0.75rem; }
.btn-quiet:hover { color: var(--text-paper); }
.btn-ink { background: var(--ink); color: var(--text-paper); }
.btn-ink:hover { background: var(--ink-2); }
.btn-quiet-paper { color: var(--text-ink-2); padding-inline: 0.75rem; }
.btn-quiet-paper:hover { color: var(--text-ink); }

.text-link {
  color: var(--text-ink);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--live-paper);
  padding-bottom: 2px;
}
.text-link:hover { color: var(--live-paper); }

/* ---------- typography helpers ---------- */
.eyebrow, .kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-paper-2);
}
.kicker {
  color: var(--live-paper);
  margin-bottom: 1.4rem;
}
.kicker::before {
  content: "";
  display: inline-block;
  width: 2.25rem;
  height: 1px;
  background: currentColor;
  vertical-align: middle;
  margin-right: 0.75rem;
}
.kicker-ink { color: var(--live); }

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 420;
  line-height: 1.08;
  letter-spacing: 0;
  max-width: 22ch;
}
.section-head { margin-bottom: clamp(2.5rem, 2rem + 3vw, 4.5rem); }
.section-lede {
  margin-top: 1.5rem;
  max-width: 58ch;
  color: var(--text-ink-2);
  font-size: var(--text-lg);
  line-height: 1.55;
}

/* ---------- hero ---------- */
.hero { padding-top: clamp(5rem, 4rem + 7vw, 11rem); }
.hero .container { max-width: var(--container); }
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 380;
  line-height: 1.02;
  letter-spacing: 0;
  margin-top: 1.75rem;
  max-width: 14ch;
}
.hero-title em {
  font-style: italic;
  font-weight: 430;
  color: var(--live);
}
.hero-sub {
  margin-top: 2rem;
  max-width: 52ch;
  font-size: var(--text-lg);
  line-height: 1.55;
  color: var(--text-paper-2);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 2.75rem;
}
.hero-ticker {
  margin-top: clamp(4rem, 3rem + 5vw, 7rem);
  border-top: 1px solid var(--rule-ink);
  background: rgba(240, 234, 219, 0.03);
}
.ticker-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.9rem;
  padding-block: 1rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  color: var(--text-paper-2);
}
.ticker-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-paper);
}
.ticker-sep { opacity: 0.3; }
.ticker-link {
  margin-left: auto;
  color: var(--live);
  text-decoration: none;
}
.ticker-link:hover { text-decoration: underline; }

/* live dot: semantic cyan, opacity pulse only */
.live-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--live);
  flex: none;
  animation: live-pulse 2.4s ease-in-out infinite;
}
.band-paper .live-dot, .band-paper-deep .live-dot { background: var(--live-paper); }
@keyframes live-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ---------- thesis ---------- */
.thesis-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(2rem, 1.5rem + 2vw, 3.5rem);
  border-top: 1px solid var(--rule-paper);
  padding-top: 2.5rem;
}
.numeral {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-xl);
  color: var(--live-paper);
  margin-bottom: 1rem;
}
.thesis-item h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  line-height: 1.25;
  margin-bottom: 0.9rem;
  max-width: 24ch;
}
.thesis-item p { color: var(--text-ink-2); font-size: var(--text-sm); line-height: 1.65; }
.thesis-close {
  margin-top: clamp(3rem, 2.5rem + 2vw, 4.5rem);
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-xl);
  font-weight: 400;
  line-height: 1.35;
  max-width: 34ch;
}

/* ---------- ledger (the public record) ---------- */
.ledger {
  border-top: 2px solid var(--text-ink);
  border-bottom: 1px solid var(--rule-paper);
}
.ledger-head, .ledger-row {
  display: grid;
  grid-template-columns: 3.5rem 1fr 12rem 13rem;
  gap: 1.25rem;
  align-items: baseline;
  padding: 1.1rem 0.25rem;
}
.ledger-head {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-ink-2);
  border-bottom: 1px solid var(--rule-paper);
  padding-block: 0.7rem;
}
.ledger-row {
  text-decoration: none;
  color: var(--text-ink);
  border-bottom: 1px solid var(--rule-paper);
  transition: background-color 180ms var(--ease-exit);
}
.ledger-row:last-child { border-bottom: none; }
.ledger-row:hover { background: rgba(238, 243, 207, 0.55); }
.col-no {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-ink-2);
}
.col-entry { font-size: var(--text-base); line-height: 1.5; max-width: 52ch; }
.col-cat {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--text-ink-2);
}
.col-ref {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  color: var(--live-paper);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  justify-self: end;
  text-align: right;
}
.ledger-row:hover .col-ref { text-decoration: underline; }
.ledger-note {
  margin-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  color: var(--text-ink-2);
}
.ledger-note a { color: var(--live-paper); }

/* ---------- practice ---------- */
.practice-list { border-top: 1px solid var(--rule-paper); }
.practice-row {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 2rem;
  padding-block: clamp(1.75rem, 1.5rem + 1.5vw, 2.75rem);
  border-bottom: 1px solid var(--rule-paper);
}
.practice-no {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--live-paper);
  padding-top: 0.4rem;
}
.practice-body h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 460;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}
.practice-body p {
  color: var(--text-ink-2);
  max-width: 62ch;
  line-height: 1.6;
}

/* ---------- the standard ---------- */
.standard-list {
  list-style: none;
  border-top: 1px solid var(--rule-ink);
  max-width: 60rem;
}
.standard-list li {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  padding-block: 1.2rem;
  border-bottom: 1px solid var(--rule-ink);
  font-size: var(--text-lg);
  line-height: 1.45;
  color: var(--text-paper);
}
.std-no {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--live);
  flex: none;
  width: 1.5rem;
}
.standard-close {
  margin-top: 2.5rem;
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-xl);
  color: var(--text-paper-2);
}

/* ---------- cohort / engagement ---------- */
.cohort-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(3rem, 2.5rem + 3vw, 5rem);
  align-items: start;
}
@media (min-width: 961px) {
  .cohort-grid { grid-template-columns: 1.05fr 1fr; }
}
.cohort-copy p { max-width: 56ch; color: var(--text-ink-2); font-size: var(--text-lg); line-height: 1.55; }
.cohort-copy .section-title { margin-bottom: 1.5rem; }
.cohort-fine {
  margin-top: 1.25rem;
  font-size: var(--text-sm) !important;
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}
.cohort-promo {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule-paper);
  font-size: var(--text-sm) !important;
  color: var(--text-ink-2);
}
.cohort-promo a { color: var(--live-paper); }

/* the request form: a document, not a widget */
.engage-form {
  background: var(--paper-deep);
  border: 1px solid var(--rule-paper);
  border-top: 2px solid var(--text-ink);
  padding: clamp(1.5rem, 1.25rem + 1.5vw, 2.5rem);
}
.engage-head {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 460;
  margin-bottom: 1.75rem;
}
.field-row { display: flex; gap: 1.25rem; }
.field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  flex: 1;
  min-width: 0;
  margin-bottom: 1.4rem;
}
.field label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-ink-2);
}
.field input,
.field select,
.field textarea {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text-ink);
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(32, 32, 29, 0.35);
  border-radius: 0;
  padding: 0.45rem 0;
  width: 100%;
  transition: border-color 180ms var(--ease-exit);
}
.field textarea { resize: vertical; line-height: 1.5; }
.field select {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%233f3d37' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.15rem center;
  padding-right: 1.5rem;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-bottom-color: var(--live-paper);
  border-bottom-width: 2px;
}
.engage-submit { width: 100%; text-align: center; margin-top: 0.25rem; }
.engage-fine {
  margin-top: 1.1rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--text-ink-2);
  line-height: 1.6;
}
.engage-fine a { color: var(--live-paper); }

.hp-field {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.engage-submit:disabled { opacity: 0.6; cursor: default; }
.engage-submit:disabled:hover { transform: none; }

.engage-status {
  margin-top: 1rem;
  min-height: 1px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.engage-status.is-error { color: var(--live-paper); }
.engage-status.is-error a { text-decoration: underline; }

.engage-success-body {
  margin-top: 1rem;
  color: var(--text-ink-2);
  font-size: var(--text-base);
  line-height: 1.6;
  max-width: 34ch;
}

/* ---------- founder ---------- */
.founder-grid { display: grid; }
.founder-copy > p { max-width: 58ch; font-size: var(--text-lg); line-height: 1.6; color: var(--text-ink-2); }
.founder-copy .section-title { margin-bottom: 1.5rem; }
.founder-copy strong { color: var(--text-ink); font-weight: 600; }
.founder-quote {
  margin-block: 2.5rem;
  padding-left: 1.75rem;
  border-left: 2px solid var(--live-paper);
  max-width: 56ch;
}
.founder-quote p {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  font-style: italic;
  line-height: 1.4;
  color: var(--text-ink);
}
.founder-quote cite {
  display: block;
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--text-ink-2);
}
.founder-quote cite em { font-style: italic; }

/* ---------- for agents ---------- */
.agent-block {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(2rem, 1.5rem + 2vw, 4rem);
  align-items: start;
}
.agent-pre {
  background: rgba(240, 234, 219, 0.045);
  border: 1px solid var(--rule-ink);
  padding: clamp(1.25rem, 1rem + 1vw, 2rem);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--text-paper);
}
.agent-pre code { font-family: inherit; }
.agent-note {
  color: var(--text-paper-2);
  font-size: var(--text-lg);
  line-height: 1.6;
  max-width: 44ch;
}

/* ---------- footer ---------- */
.footer { padding-block: var(--space-band) 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 4rem;
}
.footer-mark img { opacity: 0.9; }
.footer-word {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-top: 1rem;
}
.footer-line { color: var(--text-paper-2); font-size: var(--text-sm); margin-top: 0.4rem; }
.footer-head {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-paper-2);
  margin-bottom: 1.1rem;
}
.footer-nav { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-nav a {
  color: var(--text-paper);
  text-decoration: none;
  font-size: var(--text-sm);
  width: fit-content;
  border-bottom: 1px solid transparent;
}
.footer-nav a:hover { border-bottom-color: var(--live); }
.footer-legal {
  border-top: 1px solid var(--rule-ink);
  padding-block: 1.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  color: var(--text-paper-2);
}

/* ---------- reveal motion (progressive enhancement: no JS, no hiding) ---------- */
html.js .reveal {
  opacity: 0;
  transform: translate3d(0, 12px, 0);
  transition: opacity 240ms var(--ease-exit), transform 240ms var(--ease-exit);
}
html.js .reveal.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .live-dot { animation: none; }
  .btn:hover { transform: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .masthead-nav { display: none; }
  .thesis-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .thesis-item h3 { max-width: none; }
  .ledger-head { display: none; }
  .ledger-row {
    grid-template-columns: 3rem 1fr;
    grid-template-areas:
      "no entry"
      "no cat"
      "no ref";
    row-gap: 0.5rem;
    padding-block: 1.25rem;
  }
  .ledger-row .col-no { grid-area: no; }
  .ledger-row .col-entry { grid-area: entry; }
  .ledger-row .col-cat { grid-area: cat; }
  .ledger-row .col-ref { grid-area: ref; justify-self: start; text-align: left; }
  .practice-row { grid-template-columns: 3.5rem 1fr; gap: 1.25rem; }
  .agent-block { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

@media (max-width: 640px) {
  .field-row { flex-direction: column; gap: 0; }
}

@media (max-width: 520px) {
  .hero-actions .btn { width: 100%; text-align: center; }
  .ticker-link { margin-left: 0; }
  .masthead-word { font-size: 1.05rem; }
  .masthead-inner { gap: 1rem; }
}