@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&family=JetBrains+Mono:wght@300;400;500&display=swap');

/* ─── Tokens ─────────────────────────────────────────── */
:root {
  --bg:       oklch(8% 0.015 240);
  --bg2:      oklch(11% 0.018 240);
  --bg3:      oklch(15% 0.02 240);
  --surface:  oklch(13% 0.02 240);
  --border:   oklch(22% 0.025 220);
  --text:     oklch(92% 0.008 80);
  --muted:    oklch(55% 0.01 220);
  --teal:     oklch(74% 0.14 185);
  --teal-dim: oklch(74% 0.14 185 / 0.15);
  --amber:    oklch(74% 0.14 55);
  --amber-dim:oklch(74% 0.14 55 / 0.15);
  --font-head: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --nav-h: 68px;
}

/* ─── Reset ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ─── Nav ────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.5rem, 5vw, 3.5rem);
  background: oklch(8% 0.015 240 / 0);
  border-bottom: 1px solid oklch(100% 0 0 / 0);
  transition: background 0.4s, border-color 0.4s;
}
nav.scrolled {
  background: oklch(8% 0.015 240 / 0.92);
  border-bottom-color: var(--border);
  backdrop-filter: blur(16px);
}
.nav-logo {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-logo .logo-glyph {
  width: 28px; height: 28px;
}
.nav-links {
  display: flex;
  gap: clamp(1.2rem, 3vw, 2.4rem);
  list-style: none;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0; right: 0;
  height: 1px;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }
.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.5rem 1.2rem;
  border: 1px solid var(--teal);
  color: var(--teal);
  border-radius: 2px;
  transition: background 0.2s, color 0.2s;
}
.nav-cta:hover { background: var(--teal); color: var(--bg); }

/* ─── Layout helpers ─────────────────────────────────── */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 5vw, 3.5rem);
}
.section {
  padding: clamp(5rem, 10vw, 8rem) 0;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 1.2rem;
}
.section-title {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}
.section-body {
  font-size: 1.05rem;
  color: oklch(78% 0.01 220);
  max-width: 62ch;
  line-height: 1.75;
  text-wrap: pretty;
}

/* ─── Divider ─────────────────────────────────────────── */
.divider {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 0;
}

/* ─── Glow card ──────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, var(--teal-dim), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
}
.card:hover { border-color: oklch(35% 0.04 200); transform: translateY(-2px); }
.card:hover::before { opacity: 1; }

/* ─── Placeholder image ──────────────────────────────── */
.placeholder {
  background: var(--bg3);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  position: relative;
  overflow: hidden;
}
.placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 8px,
    oklch(100% 0 0 / 0.02) 8px,
    oklch(100% 0 0 / 0.02) 9px
  );
}

/* ─── Button ─────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.85rem 2rem;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}
.btn-primary {
  background: var(--teal);
  color: var(--bg);
}
.btn-primary:hover { background: oklch(80% 0.14 185); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--teal); color: var(--teal); }

/* ─── Scroll-reveal ──────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22,1,0.36,1), transform 0.7s cubic-bezier(0.22,1,0.36,1);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ─── Footer ─────────────────────────────────────────── */
footer {
  padding: 3rem clamp(1.5rem, 5vw, 3.5rem);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-logo {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}
.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--teal); }

/* ─── Scroll progress bar ────────────────────────────── */
.progress-bar {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--teal), var(--amber));
  width: 0%;
  z-index: 99;
  transition: width 0.1s linear;
}