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

/* ─── DESIGN TOKENS ─── */
:root {
  --bg: #06080f;
  --bg-2: #090c16;
  --bg-3: #0e1525;
  --surface: #111827;
  --surface-2: #1a2236;
  --border: rgba(99, 120, 180, 0.12);
  --border-2: rgba(99, 120, 180, 0.22);
  --primary: #5b6ef5;
  --primary-2: #818cf8;
  --glow: rgba(91, 110, 245, 0.35);
  --cyan: #22d3ee;
  --cyan-dim: rgba(34, 211, 238, 0.15);
  --green: #34d399;
  --green-dim: rgba(52, 211, 153, 0.15);
  --orange: #fbbf24;
  --red: #f87171;
  --text: #eef2ff;
  --text-2: #94a3b8;
  --text-3: #4a5568;
  --ff-head: "Bricolage Grotesque", sans-serif;
  --ff-display: "Fraunces", serif;
  --ff-body: "DM Sans", sans-serif;
  --ff-mono: "JetBrains Mono", monospace;
}

/* ─── BASE ─── */
html {
  scroll-behavior: smooth;
  overflow-x: hidden; /* prevent horizontal scroll on iOS Safari */
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--ff-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ─── SCROLLBAR ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ─── NOISE TEXTURE ─── */
/* z-index: 2 keeps it above background orbs (z-index: 0) but well below
   interactive elements like nav (z-index: 100) and header (z-index: 100).
   Using 999 caused iOS Safari touch-event bugs on hamburger menus. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 2;
  opacity: 0.5;
}

/* ─── BACKGROUND ORBS (inner pages) ─── */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(110px);
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  animation: orb-in 1.2s ease forwards;
}
.bg-orb-1 {
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(91, 110, 245, 0.22) 0%, transparent 70%);
  top: -250px;
  left: -200px;
  animation-delay: 0s;
}
.bg-orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.1) 0%, transparent 70%);
  bottom: -100px;
  right: -100px;
  animation-delay: 0.2s;
}
@keyframes orb-in {
  to { opacity: 1; }
}

/* ─── BRAND ICON ─── */
.brand-icon {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  box-shadow: 0 0 14px var(--glow);
  flex-shrink: 0;
}

/* ─── BRAND LINK ─── */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

/* ─── HEADER (inner pages) ─── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(6, 8, 15, 0.8);
  backdrop-filter: blur(16px);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ─── BACK LINK ─── */
.back-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-3);
  text-decoration: none;
  transition: color 0.2s;
  font-family: var(--ff-body);
}
.back-link:hover {
  color: var(--text-2);
}

/* ─── CODE SYNTAX ─── */
.kw { color: #c084fc; }
.fn { color: #60a5fa; }
.cl { color: #34d399; }
.st { color: #fca5a5; }
.cm { color: #4a5568; }
.nm { color: #fbbf24; }
.pu { color: var(--text); }
.op { color: var(--text-2); }

/* ─── RESPONSIVE: mobile header ─── */
@media (max-width: 600px) {
  .header-inner {
    padding: 0 16px;
    height: 56px;
  }
  .brand {
    font-size: 15px;
  }
}