/* ---------- Tokens ---------- */
:root {
  --void: #0A0D12;
  --glass: rgba(10, 13, 18, 0.06);
  --glass-strong: rgba(10, 13, 18, 0.18);
  --line: rgba(255, 255, 255, 0.14);
  --ink: #F3F4F6;
  --ink-dim: #A6ACB8;
  --accent: #4FE3C8;

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

  --progress: 0; /* set by script.js, 0 → 1 across the page — scrubs the robot video */
  --max-w: 1160px;
  --card-pad: clamp(28px, 4vw, 48px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

body {
  margin: 0;
  background: var(--void);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
  color: var(--ink);
}

p { margin: 0 0 1em; color: var(--ink-dim); max-width: 62ch; }

a { color: inherit; }

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Background robot video layer ---------- */
/* script.js sets this <video>'s currentTime based on scroll position (the
   video itself is paused, never plays on its own) so scrolling scrubs
   through the turn-and-eyes clip. Sized to cover the full viewport. */
.robot-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: var(--void);
}

.robot-video {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
}

/* ---------- Content layer ---------- */
.content {
  position: relative;
  z-index: 1;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px clamp(16px, 5vw, 64px);
  margin: 12px clamp(10px, 3vw, 40px) 0;
  background: var(--glass);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--line);
  border-radius: 16px;
}

@media (max-width: 480px) {
  .nav .btn-ghost {
    padding: 9px 16px;
    font-size: 0.85rem;
  }
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--ink);
}

.wordmark.small { font-size: 1rem; }

.nav-links {
  display: flex;
  gap: 28px;
}
.nav-links a {
  text-decoration: none;
  color: var(--ink-dim);
  font-size: 0.92rem;
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--ink); }

@media (max-width: 720px) {
  .nav-links { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 11px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--ink);
  color: #0A0D12;
}
.btn-primary:hover { background: #FFFFFF; }

.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
  background: rgba(255,255,255,0.06);
}
.btn-ghost:hover { border-color: rgba(255,255,255,0.4); }

.btn-text {
  color: var(--ink-dim);
  padding: 11px 4px;
}
.btn-text:hover { color: var(--ink); }

/* ---------- Glass card base ---------- */
/* Every content panel shares this: a dark frosted card with real breathing
   room, so text never touches the edges, sitting legibly over the video. */
.hero-copy,
.section-inner,
.footer {
  background: var(--glass);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}

/* At this level of transparency the video shows through strongly, so text
   needs its own contrast cushion rather than relying on the card alone. */
.hero-copy h1, .hero-copy p, .hero-copy .tag,
.section-inner h2, .section-inner h3, .section-inner p, .section-inner .stage {
  text-shadow: 0 2px 6px rgba(0,0,0,0.9), 0 0 24px rgba(0,0,0,0.7);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 92vh;
  min-height: 92dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 clamp(20px, 6vw, 80px);
  max-width: var(--max-w);
  margin: 0 auto;
}

.hero-copy {
  max-width: 640px;
  padding: var(--card-pad);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  margin-bottom: 24px;
}

.hero .lede {
  font-size: 1.1rem;
  color: var(--ink-dim);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.scroll-cue {
  position: absolute;
  bottom: 40px;
  left: clamp(20px, 6vw, 80px);
  display: flex;
  align-items: center;
  gap: 10px;
}
.scroll-cue span {
  width: 1px;
  height: 32px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  display: block;
}
.scroll-cue p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--ink-dim);
}

/* ---------- Sections ---------- */
.section {
  padding: 90px clamp(20px, 6vw, 80px);
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-inner {
  max-width: 720px;
  padding: var(--card-pad);
}
.section-inner.center {
  max-width: 560px;
  margin: 0 auto;
  text-align: left;
}

.section h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  margin-bottom: 22px;
}

/* Neural rail (capabilities) */
.rail {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  position: relative;
}
.rail::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}
.rail-item {
  position: relative;
  display: flex;
  gap: 24px;
  padding: 0 0 44px 34px;
}
.rail-item:last-child { padding-bottom: 0; }
.rail-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  border: 1.5px solid var(--line);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.rail-item.is-active .rail-dot {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 14px rgba(79,227,200,0.6);
}
.rail-item h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}
.rail-item p { margin: 0; }

/* Timeline (roadmap) */
.timeline {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.timeline li {
  border-top: 2px solid var(--line);
  padding-top: 18px;
  transition: border-color 0.3s ease;
}
.timeline li.is-active { border-top-color: var(--accent); }
.stage {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}
.timeline h3 { font-size: 1rem; margin-bottom: 8px; }
.timeline p { font-size: 0.92rem; margin: 0; }

@media (max-width: 860px) {
  .timeline { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .timeline { grid-template-columns: 1fr; }
}

/* Access / waitlist */
.section-access { padding-bottom: 140px; }
.access-form {
  display: flex;
  gap: 10px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.access-form input {
  flex: 1;
  min-width: 220px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 12px 20px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.95rem;
}
.access-form input::placeholder { color: var(--ink-dim); }
.access-form input:focus { border-color: var(--accent); outline: none; }

.form-note {
  margin: 16px 0 0;
  font-size: 0.88rem;
  min-height: 1.4em;
  color: var(--accent);
}

/* ---------- Footer ---------- */
.footer {
  padding: 32px clamp(20px, 6vw, 48px);
  max-width: var(--max-w);
  margin: 0 auto 40px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-dim);
  max-width: none;
}
.footer-contact {
  font-size: 0.85rem;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 0.15s ease;
}
.footer-contact:hover {
  color: var(--accent);
}