/* ==========================================================================
   Keystroke — "Ghostwriter"
   Ink & Bone, editorial kinetic typography.
   ========================================================================== */

:root {
  /* Palette */
  --obsidian: #0B0B10;
  --obsidian-2: #0E0E14;
  --ink: #12121A;
  --ink-2: #1A1A22;
  --ink-3: #242430;
  --hair: #2A2A36;
  --bone: #EDE8DB;
  --bone-dim: #C7C3B6;
  --bone-mute: #8A8778;
  --ghost: #4A4A55;
  --ghost-2: #383842;
  --amber: #E8B04A;
  --amber-hot: #F4C061;
  --amber-soft: rgba(232, 176, 74, 0.12);
  --amber-line: rgba(232, 176, 74, 0.35);

  /* Type */
  --serif: "Fraunces", ui-serif, Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Measure */
  --wrap: 1280px;
  --pad-x: clamp(1.25rem, 4vw, 3rem);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  background: var(--obsidian);
  color: var(--bone);
  font-family: var(--sans);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
}
body {
  font-weight: 400;
  line-height: 1.5;
  overflow-x: hidden;
  background:
    radial-gradient(1100px 700px at 85% -10%, rgba(232,176,74,0.06), transparent 60%),
    radial-gradient(1200px 900px at 10% 20%, rgba(232,176,74,0.035), transparent 70%),
    var(--obsidian);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
kbd {
  font-family: var(--mono);
  font-size: 0.78em;
  padding: 2px 7px;
  border: 1px solid var(--hair);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--ink-2);
  color: var(--bone);
  white-space: nowrap;
}
::selection { background: var(--amber); color: var(--obsidian); }

/* ---------- Layout utilities ---------- */
.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  width: 100%;
}
.mono { font-family: var(--mono); font-size: 0.88em; letter-spacing: 0.01em; }
.mute { color: var(--bone-mute); }

/* ---------- Eyebrow labels ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bone-mute);
  margin: 0 0 clamp(1.25rem, 2.5vw, 2rem);
}
.eyebrow--center { justify-content: center; }
.eyebrow--amber { color: var(--amber); }
.eyebrow__dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(232,176,74,0.15);
}

/* ---------- Display type ---------- */
.display {
  font-family: var(--serif);
  font-weight: 400;
  font-style: normal;
  letter-spacing: -0.025em;
  line-height: 0.95;
  margin: 0;
  font-variation-settings: "opsz" 144, "SOFT" 30;
  color: var(--bone);
}
.display em {
  font-style: italic;
  font-weight: 400;
  color: var(--amber);
}
.display .line,
.display > span {
  display: block;
}
.display--hero   { font-size: clamp(3rem, 8.5vw, 7.25rem); font-weight: 350; }
.display--giant  { font-size: clamp(2.5rem, 7vw, 6rem); font-weight: 350; }
.display--lg     { font-size: clamp(2.25rem, 5.5vw, 4.5rem); font-weight: 400; }
.display--md     { font-size: clamp(1.75rem, 4vw, 3.25rem); font-weight: 400; }

/* Ghost-reveal: resolved word is bone, unresolved is ghost */
.display [data-word] {
  display: inline-block;
  color: var(--ghost);
  transition: color 520ms cubic-bezier(.2,.7,.2,1);
}
.display [data-word].is-resolved { color: inherit; }
.display [data-word].is-resolved.is-em { color: var(--amber); font-style: italic; }

/* Blinking caret */
.caret {
  display: inline-block;
  width: 0.07em;
  height: 0.85em;
  background: var(--amber);
  vertical-align: -0.08em;
  margin-left: 0.08em;
  animation: blink 1.08s steps(1) infinite;
  box-shadow: 0 0 18px rgba(232,176,74,0.6);
}
@keyframes blink {
  50% { opacity: 0; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 26px;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 0.96rem;
  line-height: 1;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 200ms ease, background 200ms ease, color 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
  white-space: nowrap;
  cursor: pointer;
}
.btn__arrow { transition: transform 240ms ease; }
.btn:hover .btn__arrow { transform: translateX(4px); }

.btn--primary {
  background: var(--amber);
  color: var(--obsidian);
  box-shadow: 0 10px 40px -12px rgba(232,176,74,0.65), inset 0 -1px 0 rgba(0,0,0,0.12);
}
.btn--primary:hover {
  background: var(--amber-hot);
  transform: translateY(-1px);
  box-shadow: 0 14px 50px -10px rgba(232,176,74,0.75), inset 0 -1px 0 rgba(0,0,0,0.12);
}

.btn--ghost {
  background: transparent;
  color: var(--bone);
  border-color: var(--hair);
}
.btn--ghost:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.btn--block { display: flex; width: 100%; }
.btn--xl { padding: 22px 38px; font-size: 1.1rem; }

/* ---------- NAV ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: rgba(11,11,16,0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 300ms ease, background 300ms ease;
}
.nav.is-scrolled { border-bottom-color: var(--hair); background: rgba(11,11,16,0.88); }
.nav.menu-open {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background: var(--obsidian);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
}
.nav__brand {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--bone);
}
.nav__mark::first-letter { color: var(--amber); }

.nav__links {
  display: flex;
  gap: 30px;
  font-size: 0.92rem;
  color: var(--bone-dim);
}
.nav__links a {
  position: relative;
  padding: 4px 0;
  transition: color 200ms;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--amber);
  transition: right 260ms ease;
}
.nav__links a:hover { color: var(--bone); }
.nav__links a:hover::after { right: 0; }

.nav__cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 999px;
  background: var(--amber);
  color: var(--obsidian);
  transition: background 200ms;
}
.nav__cta:hover { background: var(--amber-hot); }

/* Burger button — hidden on desktop */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  cursor: pointer;
  z-index: 60;
}
.nav__burger span {
  display: block;
  height: 2px;
  background: var(--bone);
  border-radius: 2px;
  transition: transform 280ms ease, opacity 200ms ease;
  transform-origin: center;
}
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 960px) {
  .nav__links {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    z-index: 55;
    background: var(--obsidian);
    padding: 100px var(--pad-x) 3rem;
    gap: 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 260ms ease;
  }
  .nav__links a {
    font-family: var(--serif);
    font-size: 2rem;
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--bone);
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--hair);
  }
  .nav__links a:last-child { border-bottom: none; }
  .nav__links a::after { display: none; }
  .nav__links.is-open {
    opacity: 1;
    pointer-events: auto;
  }
  .nav__burger { display: flex; }
  .nav__cta { display: none; }
}
@media (max-width: 480px) {
  .nav__inner { height: 64px; }
  .nav__brand { font-size: 1.25rem; }
}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative;
  padding: clamp(3rem, 9vw, 7rem) 0 clamp(3rem, 7vw, 6rem);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 140vw;
  height: 140vw;
  max-width: 1800px;
  max-height: 1800px;
  transform: translate(-50%, -50%);
  background: radial-gradient(closest-side, rgba(232,176,74,0.07), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}
.hero__copy > .eyebrow { margin-bottom: 1.5rem; }

.hero__sub {
  max-width: 58ch;
  margin: clamp(1.75rem, 3vw, 2.5rem) 0 clamp(2rem, 3.5vw, 3rem);
  color: var(--bone-dim);
  font-size: clamp(1.05rem, 1.35vw, 1.2rem);
  line-height: 1.65;
}

.hero__ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 2.5rem);
  margin: 0;
  padding-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--hair);
}
.hero__stats > div { min-width: 0; }
.hero__stats dt {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bone-mute);
  margin-bottom: 8px;
}
.hero__stats dd {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 400;
  color: var(--bone);
  line-height: 1;
  letter-spacing: -0.02em;
}
.hero__stats dd span {
  font-size: 0.55em;
  color: var(--bone-mute);
  margin-left: 3px;
}

/* Hero screenshot */
.hero__shot {
  position: relative;
  margin: 0;
  min-width: 0;
}
.hero__shot-frame {
  position: relative;
  padding: 14px;
  background: var(--ink);
  border: 1px solid var(--hair);
  border-radius: 18px;
  transform: rotate(1.5deg);
  box-shadow:
    0 40px 90px -30px rgba(0,0,0,0.75),
    0 0 0 1px rgba(232,176,74,0.08),
    0 -8px 60px -20px rgba(232,176,74,0.12);
  transition: transform 500ms cubic-bezier(.2,.7,.2,1);
}
.hero__shot-frame::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 18px;
  padding: 1px;
  background: linear-gradient(140deg, rgba(232,176,74,0.35), transparent 45%, rgba(232,176,74,0.12));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}
.hero__shot:hover .hero__shot-frame { transform: rotate(0deg); }
.hero__shot img { border-radius: 10px; display: block; width: 100%; }
.hero__shot figcaption {
  margin-top: 18px;
  font-size: 0.85rem;
  color: var(--bone-mute);
  line-height: 1.5;
}
.hero__shot figcaption .mono { color: var(--amber); }

.hero__scroll {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: clamp(2rem, 4vw, 3.5rem);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone-mute);
  padding: 0 var(--pad-x);
  position: relative;
  z-index: 1;
}
.hero__scroll-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--hair), transparent 80%);
}

@media (max-width: 1040px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__shot { order: 2; max-width: 640px; margin-top: 1rem; }
}
@media (max-width: 560px) {
  .hero__stats { grid-template-columns: repeat(2, 1fr); row-gap: 1.5rem; }
}

/* ==========================================================================
   PREMISE (full-bleed editorial moment)
   ========================================================================== */
.premise {
  padding: clamp(5rem, 13vw, 11rem) 0;
  text-align: center;
  position: relative;
}
.premise::before,
.premise::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  max-width: 480px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--hair), transparent);
}
.premise::before { top: 0; }
.premise::after  { bottom: 0; }

.premise__inner { max-width: 1100px; margin: 0 auto; }
.premise__credit {
  margin-top: clamp(2rem, 3vw, 2.5rem);
  color: var(--bone-mute);
}

/* ==========================================================================
   COMPAT STRIP
   ========================================================================== */
.compat {
  padding: clamp(2.5rem, 5vw, 4rem) 0;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  background: #070709;
}
.compat__inner { text-align: center; }
.compat__label {
  color: var(--amber);
  letter-spacing: 0.12em;
  margin: 0 0 clamp(1.25rem, 2.5vw, 2rem);
  font-size: 0.78rem;
}
.compat__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.compat__list li {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  padding: 8px 18px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  color: var(--bone-dim);
  transition: border-color 200ms ease, color 200ms ease;
}
.compat__list li:last-child {
  color: var(--bone-mute);
  border-color: transparent;
  font-style: italic;
}
.compat__list li:hover {
  border-color: var(--amber-line);
  color: var(--bone);
}

/* ==========================================================================
   DEMO
   ========================================================================== */
.demo { padding: clamp(4rem, 9vw, 8rem) 0; }
.demo__head { max-width: 780px; margin: 0 auto clamp(3rem, 5vw, 4.5rem); text-align: center; }
.demo__head .eyebrow { justify-content: center; }
.demo__sub {
  margin-top: 1.5rem;
  color: var(--bone-dim);
  font-size: 1.05rem;
}
.demo__sub .mono {
  display: block;
  margin-top: 0.75rem;
  color: var(--bone-mute);
}

.demo__stage {
  max-width: 880px;
  margin: 0 auto;
}

.demo__editor {
  background: var(--ink);
  border: 1px solid var(--hair);
  border-radius: 16px;
  overflow: hidden;
  box-shadow:
    0 50px 120px -40px rgba(0,0,0,0.7),
    0 0 0 1px rgba(232,176,74,0.04);
  transition: border-color 600ms ease, box-shadow 600ms ease;
}
.demo__editor.is-inviting {
  border-color: var(--amber-line);
  box-shadow:
    0 50px 120px -40px rgba(0,0,0,0.7),
    0 0 0 1px rgba(232,176,74,0.15),
    0 0 40px -10px rgba(232,176,74,0.1);
}
.demo__editor-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: var(--ink-2);
  border-bottom: 1px solid var(--hair);
}
.demo__dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--ghost-2);
}
.demo__dot:nth-child(1) { background: #4a4a55; }
.demo__dot:nth-child(2) { background: #4a4a55; }
.demo__dot:nth-child(3) { background: #4a4a55; }
.demo__title { margin-left: 14px; color: var(--bone-mute); }

.demo__field {
  position: relative;
  min-height: 260px;
}
.demo__overlay,
.demo__input {
  position: absolute;
  inset: 0;
  padding: clamp(1.25rem, 2.5vw, 2rem);
  font-family: var(--serif);
  font-size: clamp(1.15rem, 1.9vw, 1.5rem);
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: -0.005em;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
  border: 0;
  outline: 0;
  margin: 0;
}
.demo__overlay {
  pointer-events: none;
  color: transparent;
  z-index: 1;
}
.demo__overlay .typed { color: transparent; }
.demo__overlay .ghost {
  color: var(--ghost);
  font-style: italic;
}
.demo__overlay .caret-inline {
  display: inline-block;
  width: 2px;
  height: 1.05em;
  background: var(--amber);
  vertical-align: -0.15em;
  animation: blink 1.08s steps(1) infinite;
  margin: 0 1px;
}
.demo__input {
  color: var(--bone);
  background: transparent;
  resize: none;
  caret-color: var(--amber);
  z-index: 2;
}
.demo__input::placeholder {
  color: var(--ghost);
  font-style: italic;
}

.demo__hint {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding: 16px 22px;
  border-top: 1px solid var(--hair);
  background: var(--ink-2);
  color: var(--bone-mute);
  font-size: 0.78rem;
}

/* ==========================================================================
   PILLAR (shared)
   ========================================================================== */
.pillar {
  padding: clamp(5rem, 10vw, 9rem) 0;
  position: relative;
}
.pillar--privacy  { border-top: 1px solid var(--hair); }
.pillar--engines  { background: #070709; border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair); }
.pillar--learning {
  position: relative;
  padding: clamp(6rem, 12vw, 11rem) 0;
  overflow: hidden;
}
.pillar--learning::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(800px 500px at 50% 0%, rgba(232,176,74,0.07), transparent 60%),
    radial-gradient(700px 600px at 85% 55%, rgba(232,176,74,0.045), transparent 65%),
    radial-gradient(900px 700px at 15% 80%, rgba(232,176,74,0.035), transparent 65%);
  pointer-events: none;
}
.pillar--learning > .wrap { position: relative; z-index: 1; }

.pillar__head {
  max-width: 900px;
  margin: 0 auto clamp(3rem, 5.5vw, 5rem);
  text-align: center;
}
.pillar__head .eyebrow { justify-content: center; }
.pillar__sub {
  margin-top: clamp(1.25rem, 2.5vw, 2rem);
  color: var(--bone-dim);
  font-size: clamp(1rem, 1.25vw, 1.15rem);
  line-height: 1.7;
}
.pillar__sub em { color: var(--bone); font-style: italic; }

/* ==========================================================================
   PRIVACY cards
   ========================================================================== */
.grid--privacy {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: 4px;
  overflow: hidden;
}
.card {
  position: relative;
  background: var(--obsidian-2);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  transition: background 260ms ease;
}
.card:hover { background: var(--ink); }
.card::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--amber);
  transition: width 420ms cubic-bezier(.2,.7,.2,1);
}
.card:hover::after { width: 100%; }
.card__num {
  color: var(--amber);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 1.25rem;
}
.card h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.45rem;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 0.75rem;
  color: var(--bone);
}
.card p {
  color: var(--bone-dim);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 0;
}
.card p + p { margin-top: 0.8rem; }
.card .mono { color: var(--amber); font-size: 0.85em; }

.card--feature { grid-column: span 1; }

.card__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 1rem;
}
.card__chips li {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  padding: 5px 10px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  color: var(--bone-dim);
  background: rgba(255,255,255,0.01);
}

@media (max-width: 960px) {
  .grid--privacy { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .grid--privacy { grid-template-columns: 1fr; }
}

/* Redacted demo block */
.redacted {
  margin: clamp(3rem, 6vw, 5rem) auto 0;
  max-width: 760px;
}
.redacted__block {
  margin: 0;
  padding: clamp(1.5rem, 3vw, 2.25rem);
  background: var(--ink);
  border: 1px solid var(--hair);
  border-radius: 12px;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--bone);
  overflow-x: auto;
}
.redacted__block .safe { color: var(--amber); }
.redacted__block .redact {
  color: var(--ghost);
  background: rgba(255,255,255,0.02);
  padding: 0 4px;
  border-radius: 3px;
}
.redacted figcaption {
  text-align: center;
  margin-top: 1rem;
  color: var(--bone-mute);
}

/* ==========================================================================
   ENGINES
   ========================================================================== */
.engines {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  grid-template-rows: 1fr auto auto auto auto;
  column-gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: 4px;
  overflow: hidden;
}
.engine {
  background: #070709;
  padding: clamp(1.75rem, 2.5vw, 2.5rem) clamp(1.5rem, 2vw, 2rem);
  min-height: 360px;
  grid-row: 1 / -1;
  display: grid;
  grid-template-rows: subgrid;
  row-gap: 0;
  position: relative;
  transition: background 260ms ease;
}
.engine::before {
  content: '';
}
.engine:hover { background: var(--ink); }
.engine__tag {
  display: inline-block;
  justify-self: start;
  align-self: end;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 10px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  color: var(--bone-mute);
  margin-bottom: 0.75rem;
}
.engine__name {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.6rem, 1.9vw, 2rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 0.75rem;
  color: var(--bone);
  overflow-wrap: break-word;
  hyphens: auto;
}
.engine__model {
  color: var(--bone-mute);
  margin: 0 0 1.25rem;
  font-size: 0.78rem;
  word-break: break-all;
}
.engine__desc {
  color: var(--bone-dim);
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 0;
  align-self: start;
}
.engine--highlight { background: #0a0a0e; }
.engine--highlight .engine__tag {
  color: var(--amber);
  border-color: var(--amber-line);
  background: var(--amber-soft);
}
.engine--highlight .engine__name { color: var(--amber); font-style: italic; }

@media (max-width: 1100px) {
  .engines { grid-template-columns: repeat(2, 1fr); grid-template-rows: auto; gap: 1px; }
  .engine { grid-row: auto; display: flex; flex-direction: column; }
  .engine::before { display: none; }
  .engine__tag { align-self: flex-start; margin-bottom: 0.75rem; }
  .engine__name { margin-top: 0; }
}
@media (max-width: 560px) {
  .engines { grid-template-columns: 1fr; }
  .engine { min-height: auto; }
}

/* ==========================================================================
   LEARNING
   ========================================================================== */
/* Opening pitch paragraph */
.learning__pitch {
  max-width: 780px;
  margin: 0 auto clamp(3.5rem, 6vw, 5rem);
  padding: clamp(1.75rem, 3.5vw, 2.5rem) clamp(1.75rem, 3.5vw, 2.75rem);
  border-left: 2px solid var(--amber);
  background: linear-gradient(90deg, rgba(232,176,74,0.04), transparent 70%);
}
.learning__pitch-kicker {
  color: var(--amber);
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}
.learning__pitch-body {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(1.2rem, 1.9vw, 1.6rem);
  line-height: 1.55;
  color: var(--bone);
  letter-spacing: -0.005em;
  margin: 0;
}
.learning__pitch-body em {
  color: var(--amber);
  font-style: italic;
}

/* Sub-section headings inside the Learning pillar */
.learning__section {
  max-width: 880px;
  margin: clamp(4rem, 7vw, 6rem) auto clamp(2rem, 3.5vw, 3rem);
  text-align: center;
}
.learning__section-label {
  display: block;
  color: var(--amber);
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
  font-size: 0.78rem;
}
.learning__section-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--bone);
  margin: 0 0 0.75rem;
}
.learning__section-sub {
  font-size: clamp(1rem, 1.25vw, 1.1rem);
  line-height: 1.7;
  color: var(--bone-dim);
  margin: 1rem auto 0;
  max-width: 62ch;
}
.learning__section-sub em {
  color: var(--bone);
  font-style: italic;
}

.learning__shot {
  margin: 0 auto clamp(3rem, 5vw, 4.5rem);
  max-width: 1000px;
  padding: 14px;
  background: var(--ink);
  border: 1px solid var(--hair);
  border-radius: 16px;
  box-shadow: 0 40px 100px -40px rgba(0,0,0,0.7);
}
.learning__shot img { border-radius: 8px; width: 100%; }
.learning__shot figcaption {
  margin-top: 1rem;
  text-align: center;
  color: var(--bone-mute);
  font-size: 0.82rem;
}

.learning__mechanisms {
  max-width: 880px;
  margin: 0 auto;
  counter-reset: mech;
  display: grid;
  gap: clamp(2.5rem, 4vw, 4rem);
}
.learning__mechanisms li {
  border-top: 1px solid var(--hair);
  padding-top: clamp(1.75rem, 3vw, 2.5rem);
}
.learning__mechanisms li:first-child { border-top: 0; padding-top: 0; }
.learning__index {
  color: var(--amber);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  margin: 0 0 1rem;
}
.learning__body {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(1.15rem, 1.7vw, 1.5rem);
  line-height: 1.55;
  color: var(--bone);
  letter-spacing: -0.005em;
  margin: 0;
}

/* Learning Loop — four-step diagram */
.loop {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto;
  gap: clamp(0.5rem, 1.2vw, 1rem);
  align-items: stretch;
  position: relative;
}
.loop__step {
  background: var(--ink);
  border: 1px solid var(--hair);
  border-radius: 14px;
  padding: clamp(1.5rem, 2.5vw, 1.75rem) clamp(1.25rem, 2vw, 1.5rem);
  min-width: 0;
  position: relative;
  transition: border-color 260ms ease, transform 260ms ease;
}
.loop__step:hover {
  border-color: var(--amber-line);
  transform: translateY(-2px);
}
.loop__num {
  display: inline-block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--amber);
  margin-bottom: 1rem;
}
.loop__step h4 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
  margin: 0 0 0.5rem;
  color: var(--bone);
}
.loop__step p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--bone-dim);
}
.loop__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 1.25rem;
  color: var(--amber);
  opacity: 0.8;
  min-width: 18px;
  user-select: none;
}
.loop__arrow--return {
  grid-column: 1 / -1;
  margin-top: 1rem;
  font-size: 1.5rem;
  opacity: 0.5;
}

@media (max-width: 1040px) {
  .loop {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
  .loop__arrow { display: none; }
  .loop__arrow--return { display: none; }
}
@media (max-width: 560px) {
  .loop { grid-template-columns: 1fr; }
}

/* Six categories grid */
.categories {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: 6px;
  overflow: hidden;
}
.cat {
  background: var(--obsidian-2);
  padding: clamp(1.75rem, 2.8vw, 2.25rem);
  transition: background 260ms ease;
  position: relative;
}
.cat:hover { background: var(--ink); }
.cat::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--amber);
  transition: width 420ms cubic-bezier(.2,.7,.2,1);
}
.cat:hover::after { width: 100%; }
.cat__num {
  display: block;
  color: var(--amber);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}
.cat h4 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  color: var(--bone);
  margin: 0 0 0.6rem;
}
.cat p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--bone-dim);
}
.cat p em { color: var(--bone); font-style: italic; }

@media (max-width: 900px) {
  .categories { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .categories { grid-template-columns: 1fr; }
}

.learning__guardrails {
  max-width: 780px;
  margin: clamp(4rem, 6vw, 5rem) auto 0;
  padding: clamp(1.5rem, 3vw, 2.25rem);
  background: var(--ink);
  border: 1px solid var(--hair);
  border-left: 3px solid var(--amber);
  border-radius: 6px;
}
.learning__guardrails .mono {
  color: var(--amber);
  display: block;
  margin-bottom: 0.75rem;
}
.learning__guardrails p:not(.mono) {
  margin: 0;
  color: var(--bone-dim);
  font-size: 0.96rem;
  line-height: 1.7;
}

.learning__coda {
  max-width: 780px;
  margin: clamp(4rem, 8vw, 7rem) auto 0;
  padding: clamp(1.75rem, 3.5vw, 2.5rem) clamp(1.75rem, 3.5vw, 2.75rem);
  border-left: 2px solid var(--amber);
  background: linear-gradient(90deg, rgba(232,176,74,0.04), transparent 70%);
}
.learning__coda-label {
  color: var(--amber);
  margin: 0 0 0.75rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
}
.learning__coda-body {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(1.2rem, 1.9vw, 1.6rem);
  line-height: 1.55;
  color: var(--bone);
  letter-spacing: -0.005em;
  margin: 0;
}
.learning__coda-body em {
  color: var(--amber);
  font-style: italic;
}

/* ==========================================================================
   KEYS — keycap marquee
   ========================================================================== */
.keys {
  padding: clamp(4rem, 8vw, 7rem) 0;
  overflow: hidden;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  background: #070709;
}
.keys__head {
  text-align: center;
  max-width: 900px;
  margin: 0 auto clamp(3rem, 5vw, 4.5rem);
}
.keys__head .eyebrow { justify-content: center; }

.marquee {
  width: 100%;
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee__track {
  display: flex;
  gap: 40px;
  width: max-content;
  animation: marquee 45s linear infinite;
}
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.kc {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 22px 26px;
  background: var(--ink);
  border: 1px solid var(--hair);
  border-radius: 14px;
  min-width: 240px;
  flex-shrink: 0;
  box-shadow: 0 20px 60px -30px rgba(0,0,0,0.8);
}
.kc__keys { display: flex; gap: 6px; align-items: center; }
.kc__keys kbd {
  font-size: 0.88rem;
  padding: 8px 12px;
  border-radius: 7px;
  background: linear-gradient(180deg, #20202c, #161620);
  border: 1px solid #2f2f3d;
  border-bottom: 2px solid #0b0b12;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.04),
    0 2px 0 rgba(0,0,0,0.5);
  color: var(--bone);
}
.kc__label {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--bone-mute);
  text-transform: uppercase;
}

/* ==========================================================================
   PRICING
   ========================================================================== */
.pricing { padding: clamp(5rem, 10vw, 9rem) 0; }

.plans {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
  max-width: 1000px;
  margin: 0 auto;
}
.plan {
  position: relative;
  background: var(--obsidian-2);
  border: 1px solid var(--hair);
  border-radius: 18px;
  padding: clamp(2rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
}
.plan--pro {
  background: radial-gradient(120% 80% at 100% 0%, rgba(232,176,74,0.08), transparent 50%), var(--obsidian-2);
  border-color: var(--amber-line);
}
.plan__stamp {
  position: absolute;
  top: 22px; right: 22px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 7px 12px;
  background: var(--amber);
  color: var(--obsidian);
  border-radius: 999px;
  font-weight: 500;
}
.plan__head { margin-bottom: 2rem; }
.plan__name {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.25rem, 3vw, 2.75rem);
  margin: 0;
  letter-spacing: -0.02em;
  color: var(--bone);
}
.plan--pro .plan__name { color: var(--amber); font-style: italic; }
.plan__price {
  margin: 0.5rem 0 0.75rem;
  font-family: var(--serif);
  font-size: clamp(2.75rem, 5vw, 4rem);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--bone);
}
.plan__currency { font-size: 0.55em; vertical-align: 0.5em; color: var(--bone-mute); margin-right: 4px; }
.plan__suffix { font-size: 0.3em; color: var(--bone-mute); font-family: var(--sans); letter-spacing: 0.05em; }
.plan__tag { color: var(--bone-mute); }

.plan__list {
  margin: 0 0 2rem;
  display: grid;
  gap: 0.7rem;
  color: var(--bone-dim);
  font-size: 0.96rem;
  line-height: 1.5;
}
.plan__list li {
  position: relative;
  padding-left: 22px;
}
.plan__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.55em;
  width: 10px; height: 1px;
  background: var(--amber);
}
.plan__list strong { color: var(--bone); font-weight: 500; }
.plan > .btn { margin-top: auto; }

.pricing__foot {
  text-align: center;
  color: var(--bone-mute);
  margin: clamp(2.5rem, 4vw, 3.5rem) auto 0;
}

@media (max-width: 780px) {
  .plans { grid-template-columns: 1fr; }
}

/* ==========================================================================
   START
   ========================================================================== */
.start { padding: clamp(5rem, 10vw, 9rem) 0 clamp(6rem, 11vw, 10rem); border-top: 1px solid var(--hair); }

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 2rem);
  max-width: 1100px;
  margin: 0 auto clamp(3rem, 5vw, 4.5rem);
  position: relative;
}
.steps::before {
  content: "";
  position: absolute;
  top: 40px;
  left: 5%;
  right: 5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--hair), transparent);
  z-index: 0;
}
.step {
  position: relative;
  padding: 1.5rem;
  text-align: center;
}
.step__num {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--amber);
  margin: 0 auto 1.25rem;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--hair);
  border-radius: 50%;
  background: var(--obsidian);
  position: relative;
  z-index: 1;
}
.step h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  margin: 0 0 0.75rem;
  color: var(--bone);
}
.step p {
  color: var(--bone-dim);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 0;
  max-width: 34ch;
  margin-left: auto;
  margin-right: auto;
}
.step a {
  color: var(--amber);
  border-bottom: 1px solid var(--amber-line);
  transition: border-color 200ms;
}
.step a:hover { border-bottom-color: var(--amber); }

.reqs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 1000px;
  margin: 0 auto clamp(3rem, 5vw, 4rem);
  padding: 1.5rem;
  background: var(--ink);
  border: 1px solid var(--hair);
  border-radius: 10px;
  color: var(--bone-dim);
  font-size: 0.82rem;
}
.reqs .mute { display: inline-block; margin-right: 6px; color: var(--amber); }

.start__cta { text-align: center; }

@media (max-width: 780px) {
  .steps { grid-template-columns: 1fr; gap: 2rem; }
  .steps::before { display: none; }
  .reqs { grid-template-columns: 1fr; }
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.foot {
  padding: clamp(3rem, 6vw, 5rem) 0 clamp(2rem, 4vw, 3rem);
  border-top: 1px solid var(--hair);
  background: #070709;
}
.foot__grid {
  display: grid;
  grid-template-columns: 1.1fr 1.6fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}
.foot__mark {
  font-family: var(--serif);
  font-size: 1.6rem;
  margin: 0 0 0.5rem;
  color: var(--bone);
}
.foot__mark::first-letter { color: var(--amber); }
.foot__tagline {
  margin: 0;
  font-family: var(--serif);
  font-style: italic;
  color: var(--bone-dim);
  font-size: 1.05rem;
}

.foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  font-size: 0.92rem;
  color: var(--bone-dim);
}
.foot__links a { transition: color 180ms; }
.foot__links a:hover { color: var(--amber); }

.foot__meta {
  color: var(--bone-mute);
  font-size: 0.76rem;
  line-height: 1.7;
  margin: 0;
}

@media (max-width: 780px) {
  .foot__grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   LEGAL pages (privacy / terms / refunds)
   ========================================================================== */
.legal-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: rgba(11,11,16,0.78);
  border-bottom: 1px solid var(--hair);
}
.legal-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.legal-nav__back {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bone-mute);
  transition: color 180ms;
}
.legal-nav__back:hover { color: var(--amber); }

.legal {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 6rem) var(--pad-x) clamp(4rem, 9vw, 8rem);
}
.legal__head {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  padding-bottom: clamp(1.5rem, 3vw, 2rem);
  border-bottom: 1px solid var(--hair);
}
.legal__head h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0.5rem 0 1rem;
  color: var(--bone);
}
.legal__head h1 em { font-style: italic; color: var(--amber); }
.legal__updated {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--bone-mute);
  margin: 0;
}
.legal__lede {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(1.15rem, 1.6vw, 1.35rem);
  line-height: 1.6;
  color: var(--bone-dim);
  margin: 1.5rem 0 0;
  letter-spacing: -0.005em;
}

.legal h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.5rem, 2.5vw, 1.9rem);
  letter-spacing: -0.018em;
  color: var(--bone);
  margin: clamp(2.5rem, 5vw, 3.5rem) 0 1rem;
  line-height: 1.2;
}
.legal h2:first-of-type { margin-top: 0; }
.legal h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.15rem;
  color: var(--bone);
  margin: 2rem 0 0.5rem;
  letter-spacing: -0.01em;
}
.legal p {
  color: var(--bone-dim);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0 0 1rem;
}
.legal p strong { color: var(--bone); font-weight: 500; }
.legal a { color: var(--amber); border-bottom: 1px solid var(--amber-line); transition: border-color 180ms; }
.legal a:hover { border-bottom-color: var(--amber); }

.legal ul, .legal ol {
  margin: 0 0 1.25rem 0;
  padding-left: 1.5rem;
  color: var(--bone-dim);
  font-size: 1rem;
  line-height: 1.7;
}
.legal ul { list-style: none; padding-left: 0; }
.legal ul li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 0.6rem;
}
.legal ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.7em;
  width: 10px; height: 1px;
  background: var(--amber);
}
.legal ol { list-style: decimal; padding-left: 1.5rem; }
.legal ol li { margin-bottom: 0.5rem; padding-left: 0.25rem; }
.legal ol li::marker { color: var(--amber); font-family: var(--mono); font-size: 0.9em; }

.legal .mono { color: var(--amber); font-size: 0.92em; }
.legal__callout {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--ink);
  border-left: 2px solid var(--amber);
  border-radius: 4px;
}
.legal__callout p:last-child { margin-bottom: 0; }
.legal__callout p { color: var(--bone); font-size: 0.95rem; }

/* ==========================================================================
   Reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .display [data-word] { color: inherit !important; }
  .display [data-word].is-em { color: var(--amber) !important; }
  .caret { display: none; }
  .marquee__track { animation: none; transform: none; }
  .marquee { mask-image: none; -webkit-mask-image: none; }
}