/* LixiTrack marketing site — design tokens per design.md */

:root {
  --bg: #0a0e12;
  --bg-2: #0d1219;
  --surface: #11161c;
  --line: #1e2630;
  --text: #e6eaf0;
  --text-2: #9aa3af;
  --text-3: #7c8694;
  /* brand accents lifted from the LixiTrack app lockup (glass.css / logo.png) */
  --accent: #f7a64a;
  --accent-deep: #dd6f12;
  --accent-soft: rgba(247, 166, 74, 0.12);
  --cyan: #2cc5d8;
  --steel: #5f86a0;
  --warn: #e0574a; /* the "without" future — distinct from brand orange */

  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --fs-hero: clamp(2.75rem, 7.2vw, 5.5rem);
  --fs-h2: clamp(1.9rem, 4vw, 3rem);
  --fs-statement: clamp(1.5rem, 3.4vw, 2.5rem);
  --fs-body: clamp(1rem, 1.1vw, 1.125rem);

  --container: 1180px;
  --gutter: clamp(20px, 5vw, 48px);
  --radius: 16px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  overflow-x: hidden;
}

/* ---------- background layers ---------- */

#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* silk: gold and silver threads drifting behind the content */
.silk {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.silk svg {
  display: block;
  width: 100%;
  height: 100%;
}

.silk path {
  fill: none;
  stroke-linecap: round;
  stroke-dasharray: 260 170;
  animation: silk-flow 28s linear infinite;
}

@keyframes silk-flow {
  to { stroke-dashoffset: -430; }
}

.silk__deep,
.silk__near {
  will-change: transform;
}

.vignette {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(10, 14, 18, 0.6), transparent 55%),
    radial-gradient(120% 90% at 50% 0%, transparent 55%, rgba(5, 7, 10, 0.55) 100%),
    radial-gradient(100% 80% at 50% 110%, rgba(5, 7, 10, 0.6), transparent 60%);
}

main, .nav, .footer { position: relative; z-index: 1; }

/* ---------- a11y ---------- */

.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 100;
  padding: 10px 18px;
  background: var(--accent);
  color: var(--bg);
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- layout primitives ---------- */

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

.section {
  padding-block: clamp(96px, 14vh, 160px);
  position: relative;
}

.section--alt { background: linear-gradient(180deg, transparent, rgba(13, 18, 25, 0.7) 20% 80%, transparent); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 20px;
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0 0 16px;
}

.section__lede {
  color: var(--text-2);
  max-width: 56ch;
  margin: 0 0 56px;
}

/* ---------- nav ---------- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background 0.35s ease, border-color 0.35s ease;
}

.nav.is-scrolled {
  background: rgba(10, 14, 18, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}

.nav__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 16px var(--gutter);
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav__logo {
  height: 30px;
  width: auto;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.4));
}

/* wordmark treatment mirrors the app's BrandLockup */
.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  line-height: 1;
}

.wordmark .lixi {
  background: linear-gradient(180deg, #fff, #c2cdd8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.wordmark .track {
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav__links {
  display: flex;
  gap: 28px;
  margin-left: auto;
}

.nav__links a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  position: relative;
  padding-block: 4px;
  transition: color 0.25s ease;
}

.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease;
}

.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* hamburger — hidden on desktop */
.nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 7px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease;
}

.nav.is-open .nav__toggle span:first-child { transform: translateY(4.5px) rotate(45deg); }
.nav.is-open .nav__toggle span:last-child { transform: translateY(-4.5px) rotate(-45deg); }

.nav__mobile {
  position: fixed;
  inset: 0;
  z-index: -1; /* below the header bar, above the page */
  background: rgba(10, 14, 18, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.nav__mobile nav {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 110px var(--gutter) 40px;
}

.nav__mobile a:not(.btn) {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  padding-block: 10px;
}

.nav__mobile .btn { margin-top: 24px; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 30px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  transition: transform 0.25s ease, box-shadow 0.25s ease,
    background 0.25s ease, border-color 0.25s ease;
  will-change: transform;
}

.btn--primary {
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  color: var(--bg);
  box-shadow: 0 0 0 0 rgba(247, 166, 74, 0);
}

.btn--primary:hover {
  box-shadow: 0 8px 32px -8px rgba(247, 166, 74, 0.55);
}

.btn--ghost {
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(17, 22, 28, 0.4);
}

.btn--ghost:hover { border-color: var(--accent); }

.btn--sm { padding: 10px 22px; font-size: 0.875rem; }
.btn--lg { padding: 18px 40px; font-size: 1.0625rem; }

/* ---------- hero ---------- */

.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 72px;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
  max-width: 12ch;
}

.hero__title em {
  font-style: normal;
  color: var(--accent);
}

.hero__sub {
  color: var(--text-2);
  max-width: 46ch;
  margin: 0 0 40px;
  font-size: clamp(1.0625rem, 1.4vw, 1.25rem);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.scroll-cue {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.scroll-cue__line {
  width: 1px;
  height: 44px;
  background: linear-gradient(var(--accent), transparent);
  animation: cue-drop 2.2s ease-in-out infinite;
  transform-origin: top;
}

.scroll-cue__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-3);
}

@keyframes cue-drop {
  0%, 100% { transform: scaleY(0.4); opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 1; }
}

/* ---------- V02: hero lines + telemetry ---------- */

.hero__line { display: block; }
.hero__line--2 { padding-left: clamp(20px, 5vw, 72px); }

.telemetry {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(17, 22, 28, 0.55);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-3);
  margin: -6px 0 36px;
}

.telemetry b {
  font-weight: 500;
  color: var(--accent);
}

/* ---------- V02: editorial rhythm ---------- */

.section .container { position: relative; }

.section__num {
  position: absolute;
  top: -0.35em;
  right: var(--gutter);
  font-family: var(--font-mono);
  font-size: clamp(5rem, 10vw, 8rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(247, 166, 74, 0.12);
  pointer-events: none;
  user-select: none;
}

.section--quote {
  padding-block: clamp(80px, 12vh, 140px);
  text-align: center;
}

.quote {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0;
}

.quote em {
  font-style: normal;
  color: var(--accent);
}

/* readability scrim over busy scene areas */
.hero__title,
.section__title,
.cta__title,
.quote,
.proof__note,
.engines__note {
  text-shadow: 0 2px 12px rgba(10, 14, 18, 0.85), 0 0 40px rgba(10, 14, 18, 0.6);
}

/* ---------- V02: blueprint cross-section ---------- */

.blueprint {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(16px, 3vw, 36px);
  background:
    linear-gradient(rgba(30, 38, 48, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 38, 48, 0.45) 1px, transparent 1px),
    rgba(13, 18, 25, 0.7);
  background-size: 28px 28px, 28px 28px, auto;
}

.blueprint svg {
  display: block;
  width: 100%;
  height: auto;
}

.blueprint figcaption {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

/* the section, alive: gold percolating IA-3 → liner → pond */
.bp-gold {
  animation: bp-flow 7s linear infinite;
  opacity: 0;
}

@keyframes bp-flow {
  0% { offset-distance: 0%; opacity: 0; }
  6% { opacity: 0.95; }
  70% { opacity: 0.9; }
  96% { opacity: 0.5; }
  100% { offset-distance: 100%; opacity: 0; }
}

.bp-wet { animation: bp-wet 3.4s ease-in-out infinite; }

@keyframes bp-wet {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 1; }
}

.bp-pulse { animation: bp-pulse 2.4s ease-in-out infinite; }

@keyframes bp-pulse {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 1; }
}

/* ---------- statement ---------- */

.section--statement .container { position: relative; }

.statement {
  font-family: var(--font-display);
  font-size: var(--fs-statement);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
  max-width: 26ch;
  margin: 0 0 40px;
}

.statement em {
  font-style: normal;
  color: var(--accent);
}

.statement--answer {
  color: var(--text-2);
  max-width: none;
}
.statement--answer em { color: var(--cyan); }

.statement__ghost {
  position: absolute;
  top: 50%;
  right: var(--gutter);
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(8rem, 22vw, 20rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(247, 166, 74, 0.14);
  user-select: none;
  pointer-events: none;
}

/* ---------- two futures ---------- */

.futures__bar {
  position: sticky;
  top: 74px;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(10, 14, 18, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  margin-bottom: 48px;
}

.futures__toggle {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(17, 22, 28, 0.72);
}

.futures__toggle button {
  padding: 11px 24px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text-2);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease;
}

.section--futures[data-mode="without"] button[data-mode="without"] {
  background: rgba(224, 87, 74, 0.16);
  color: var(--warn);
}

.section--futures[data-mode="with"] button[data-mode="with"] {
  background: rgba(44, 197, 216, 0.14);
  color: var(--cyan);
}

.acc {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  margin-left: auto;
  padding-right: 8px;
}

.acc__value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 500;
  line-height: 1;
  transition: color 0.25s ease;
}

.section--futures[data-mode="without"] .acc__value { color: var(--warn); }
.section--futures[data-mode="with"] .acc__value { color: var(--cyan); }

.acc__label { color: var(--text-2); font-size: 0.9375rem; }

.events {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.events::before {
  content: "";
  position: absolute;
  left: 30px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.event {
  position: relative;
  padding: 0 0 48px 104px;
}

.event__day {
  position: absolute;
  left: 0;
  top: 2px;
  width: 62px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 0;
  background: var(--bg);
  z-index: 1;
}

.event__without,
.event__with {
  border: 1px solid var(--line);
  border-left-width: 3px;
  border-radius: var(--radius);
  padding: 26px 28px;
  background: rgba(17, 22, 28, 0.72);
  transition: opacity 0.35s ease, filter 0.35s ease;
}

.event__without { border-left-color: var(--warn); }
.event__with { border-left-color: var(--cyan); }

/* narrow screens: the toggle swaps which future is shown */
@media (max-width: 999px) {
  .event__without,
  .event__with { max-width: 720px; }

  .section--futures[data-mode="without"] .event__with { display: none; }
  .section--futures[data-mode="with"] .event__without { display: none; }
}

/* wide screens: both futures side by side; the toggle is a spotlight */
@media (min-width: 1000px) {
  .event {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    align-items: stretch;
  }

  .section--futures[data-mode="without"] .event__with,
  .section--futures[data-mode="with"] .event__without {
    opacity: 0.35;
    filter: saturate(0.5);
  }
}

.event h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 10px;
}

.event p {
  color: var(--text-2);
  font-size: 0.9375rem;
  line-height: 1.65;
  margin: 0 0 14px;
}

/* the product speaking — a system message, not marketing copy */
.event__rec {
  font-family: var(--font-mono);
  font-size: 0.82rem !important;
  line-height: 1.7 !important;
  color: var(--cyan) !important;
  background: rgba(44, 197, 216, 0.07);
  border: 1px solid rgba(44, 197, 216, 0.25);
  border-radius: 10px;
  padding: 12px 16px;
}

.event__delta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 6px 14px;
  border-radius: 999px;
}

.event__without .event__delta {
  color: var(--warn);
  background: rgba(224, 87, 74, 0.1);
  border: 1px solid rgba(224, 87, 74, 0.3);
}

.event__with .event__delta {
  color: var(--cyan);
  background: rgba(44, 197, 216, 0.1);
  border: 1px solid rgba(44, 197, 216, 0.3);
}

.futures__note {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-3);
  max-width: 52ch;
  margin: 8px 0 0;
}

/* ---------- cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  position: relative;
  padding: 30px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent 45%),
    rgba(17, 22, 28, 0.72);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.35s ease, box-shadow 0.35s ease;
  overflow: hidden;
  cursor: default;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.card:hover,
.card:focus-within {
  transform: translateY(-6px);
  border-color: rgba(247, 166, 74, 0.45);
  box-shadow: 0 24px 48px -24px rgba(0, 0, 0, 0.8);
}

.card:hover::before,
.card:focus-within::before { opacity: 1; }

.card__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  margin-bottom: 22px;
}

.card__icon svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 6px;
}

.card__tag {
  color: var(--text-2);
  font-size: 0.9375rem;
  margin: 0;
}

.card__more {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.35s ease 0.05s;
}

.card__more > div { overflow: hidden; }

.card__more p {
  color: var(--text-3);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.card:hover .card__more,
.card:focus-within .card__more,
.card:focus-visible .card__more {
  grid-template-rows: 1fr;
  opacity: 1;
}

/* ---------- V03: living pad showcase ---------- */

.section--showcase {
  min-height: 130vh;
  display: flex;
  align-items: center;
}

.showcase__wrap {
  display: flex;
  justify-content: flex-end;
  width: 100%;
}

.showcase__panel {
  max-width: 360px;
  padding: 30px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(10, 14, 18, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.showcase__cap {
  display: none;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.45;
  color: var(--text);
  margin: 0 0 22px;
  min-height: 5.8em;
}

.showcase__cap.is-active {
  display: block;
  animation: cap-in 0.7s ease both;
}

@keyframes cap-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

.showcase__dots {
  display: flex;
  gap: 8px;
}

.showcase__dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid var(--text-3);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.showcase__dots span.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- V03: pilot form ---------- */

.pilot {
  max-width: 720px;
  margin-inline: auto;
  text-align: left;
}

.pilot__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.pilot label {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pilot label span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
}

.pilot input {
  background: rgba(17, 22, 28, 0.72);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 13px 16px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color 0.25s ease;
}

.pilot input:focus {
  outline: none;
  border-color: var(--cyan);
}

.pilot .btn { width: 100%; }

.pilot__note {
  font-size: 0.8125rem;
  color: var(--text-3);
  text-align: center;
  margin: 16px 0 0;
}

.pilot__done {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--cyan);
  text-align: center;
  margin: 24px 0 0;
}

/* ---------- V03: origin + promises ---------- */

.origin { margin-top: 72px; max-width: 60ch; }

.origin__lede {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  font-weight: 700;
  margin: 0 0 14px;
}

.origin__body {
  color: var(--text-2);
  margin: 0;
}

.promises {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.promise {
  border-top: 2px solid var(--accent);
  padding: 20px 4px 0;
}

.promise h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 8px;
}

.promise p {
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

/* ---------- V03: card vignettes + nav lang ---------- */

.card__viz {
  margin-bottom: 20px;
  border-radius: 10px;
  background: rgba(10, 14, 18, 0.5);
  padding: 8px;
}

.card__viz svg {
  display: block;
  width: 100%;
  height: 64px;
}

.nav__signin {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.25s ease;
}
.nav__signin:hover { color: var(--text); }

.cta__signin {
  margin-top: 26px;
  font-size: 0.9375rem;
  color: var(--text-3);
}
.cta__signin a {
  color: var(--cyan);
  text-decoration: none;
  font-weight: 500;
}
.cta__signin a:hover { text-decoration: underline; }

.nav__lang {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-2);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 13px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.nav__lang:hover {
  color: var(--text);
  border-color: var(--accent);
}

/* ---------- spine ---------- */

.spine {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  counter-reset: spine;
}

.spine__node {
  position: relative;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(17, 22, 28, 0.6);
}

.spine__node:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: -20px;
  transform: translateY(-50%);
  color: var(--accent);
  font-size: 1.2rem;
  z-index: 2;
}

.spine__id {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid rgba(44, 197, 216, 0.35);
  border-radius: 6px;
  padding: 4px 10px;
  margin-bottom: 18px;
}

.spine__node h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0 0 8px;
}

.spine__node p {
  color: var(--text-2);
  font-size: 0.9375rem;
  margin: 0;
}

/* ---------- twin engines ---------- */

.engines {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 48px;
}

.engine {
  position: relative;
  padding: 34px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent 45%),
    rgba(17, 22, 28, 0.72);
  overflow: hidden;
}

.engine::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
}

.engine--det::before { background: linear-gradient(90deg, var(--accent), transparent); }
.engine--ai::before { background: linear-gradient(90deg, var(--cyan), transparent); }

.engine h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 12px;
}

.engine--det h3 { color: var(--accent); }
.engine--ai h3 { color: var(--cyan); }

.engine p {
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 0;
}

.engine__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.engine__tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: 5px 11px;
  border-radius: 6px;
  border: 1px solid var(--line);
  color: var(--text-3);
}

.engine--det .engine__tags span { border-color: rgba(247, 166, 74, 0.35); color: var(--accent); }
.engine--ai .engine__tags span { border-color: rgba(44, 197, 216, 0.35); color: var(--cyan); }

/* anatomy of a forecast: kinetic baseline + AI correction + variables */
.anatomy { margin: 56px 0; }

.anatomy__title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 12px;
}

.anatomy__lede {
  color: var(--text-2);
  max-width: 62ch;
  margin: 0 0 28px;
}

.anatomy__lede strong { color: var(--text); }

.anatomy__vars {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 24px;
}

.anatomy__row {
  display: flex;
  align-items: baseline;
  gap: 8px 16px;
  flex-wrap: wrap;
}

.anatomy__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
  min-width: 170px;
}

.engines__note {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  color: var(--text-2);
  max-width: 44ch;
  margin: 0;
}

.engines__note em {
  font-style: normal;
  color: var(--accent);
}

/* ---------- chapter dots ---------- */

.dots {
  position: fixed;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.dots a {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid var(--text-3);
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

.dots a:hover { border-color: var(--accent); }

.dots a.is-active {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.25);
}

/* ---------- proof / stats ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-block: 24px 48px;
}

.stat {
  padding: 32px 28px;
  border-top: 1px solid var(--line);
}

.stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 5vw, 4rem);
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 12px;
}

.stat__num small {
  font-size: 0.45em;
  color: var(--text-3);
}

.stat__label {
  color: var(--text-2);
  font-size: 0.9375rem;
  max-width: 24ch;
  display: block;
}

.proof__note {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  color: var(--text-2);
  max-width: 44ch;
  margin: 0;
}

/* ---------- cta ---------- */

.section--cta {
  text-align: center;
  padding-block: clamp(120px, 20vh, 220px);
}

.cta__title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}

.section--cta .section__lede { margin-inline: auto; }
.section--cta .hero__actions { justify-content: center; }

/* ---------- footer ---------- */

.footer {
  border-top: 1px solid var(--line);
  padding-block: 28px;
  background: rgba(10, 14, 18, 0.85);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 16px;
  color: var(--text-3);
  font-size: 0.875rem;
}

.footer__mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--text-3);
}

.footer__tagline {
  color: var(--steel);
  letter-spacing: 0.22em;
}

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .nav__links,
  .nav__signin,
  .nav__cta,
  .dots { display: none; }

  .cards { grid-template-columns: 1fr 1fr; }

  .nav__toggle { display: flex; margin-left: auto; }

  .engines { grid-template-columns: 1fr; }

  .spine { grid-template-columns: 1fr; }

  .spine__node:not(:last-child)::after {
    content: "↓";
    top: auto;
    bottom: -24px;
    right: auto;
    left: 32px;
  }

  .stats { grid-template-columns: 1fr; gap: 0; }

  .statement__ghost { display: none; }

  .events::before { left: 0; }
  .event { padding-left: 0; padding-top: 44px; }
  .event__day { top: 0; left: 12px; }
  .futures__bar { top: 66px; }
  .acc { margin-left: 0; }

  .pilot__grid { grid-template-columns: 1fr; }
  .promises { grid-template-columns: 1fr; }
  .showcase__panel { max-width: none; }
  .section--showcase { min-height: 100vh; }
  .nav__lang { display: none; }
}

@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero__actions .btn { width: 100%; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}