/* Design tokens */
:root {
  --bg: #07090d;
  --surface: #10141c;
  --surface-raised: #151b26;
  --border: #2a2f3a;
  --accent: #2563eb;
  --accent2: #8eb7ff;
  --paper: #f4f6fb;
  --ink: #07090d;
  --text: #f4f6fb;
  --muted: #9aa4b5;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

/* Reset and document defaults */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(circle at 85% 8%, rgba(37,99,235,0.08), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
}

section {
  padding: 7rem 4rem;
  scroll-margin-top: 5rem;
}

::selection {
  background: var(--accent);
  color: #fff;
}

.section-label {
  display: block;
  margin-bottom: 0.75rem;
  color: var(--accent2);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.section-title {
  margin-bottom: 1rem;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 4.6vw, 4.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 0.98;
}

.section-sub {
  max-width: 500px;
  margin-bottom: 3rem;
  color: var(--muted);
  font-size: 1rem;
}

/* Keyboard accessibility */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  padding: 0.7rem 1rem;
  border-radius: 0.5rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-150%);
  transition: transform 0.2s;
}

.skip-link:focus { transform: translateY(0); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}