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

/* ── Variables ── */
:root {
  --bg: #0a0a0b;
  --surface: #111113;
  --surface2: #16161a;
  --border: #1e1e22;
  --border-hover: #2a2a30;
  --text: #e8e8ed;
  --muted: #909099;
  --subtle: #5a5a6a;
  --dim: #2e2e3a;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

html { scroll-behavior: smooth; }

/* ── Body ── */
body {
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(255,255,255,0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.028) 1px, transparent 1px),
    linear-gradient(rgba(255,255,255,0.012) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.012) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
  background-position: -1px -1px, -1px -1px, -1px -1px, -1px -1px;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header / Nav ── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.25s, border-color 0.25s;
}

header.scrolled {
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}

nav {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
}

.nav-logo {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.15s;
}

.nav-links a:hover,
.nav-links a.active { color: var(--text); }