/* ═══════════════════════════════════════════════════
   L402 Mainnet — Base Styles
   Reset, typography, utility classes
   ═══════════════════════════════════════════════════ */

/* ─── Reset ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; line-height: 1.6; color: var(--text-primary); background: var(--bg-primary); transition: background 0.4s ease, color 0.4s ease; overflow-x: hidden; }
img, svg { display: block; max-width: 100%; }
a { color: var(--btc-orange); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--btc-orange-light); }
button { font-family: inherit; cursor: pointer; border: none; outline: none; }
input, textarea, select { font-family: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; color: var(--text-primary); }

/* ─── Typography Scale ───────────────────────────── */
.text-xs   { font-size: 0.75rem; }
.text-sm   { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg   { font-size: 1.125rem; }
.text-xl   { font-size: 1.25rem; }
.text-2xl  { font-size: 1.5rem; }
.text-3xl  { font-size: 1.875rem; }
.text-4xl  { font-size: 2.25rem; }
.text-5xl  { font-size: 3rem; }
.text-6xl  { font-size: 3.75rem; }

.font-mono { font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-muted { color: var(--text-muted); }
.text-orange { color: var(--btc-orange); }
.text-green { color: var(--green); }
.text-red { color: var(--red); }
.text-center { text-align: center; }

/* ─── Layout ─────────────────────────────────────── */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.container--narrow { max-width: 900px; }
.section { padding: 5rem 0; }
.section--sm { padding: 3rem 0; }

/* ─── Flex & Grid ────────────────────────────────── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.gap-4 { gap: 2rem; }

/* ─── Spacing ────────────────────────────────────── */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* ─── Animated Gradient Background ───────────────── */
.bg-mesh {
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 20% 40%, var(--mesh-1) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 20%, var(--mesh-2) 0%, transparent 50%),
    radial-gradient(ellipse 50% 60% at 50% 80%, var(--mesh-3) 0%, transparent 50%),
    var(--bg-primary);
  animation: meshShift 20s ease-in-out infinite alternate;
}
@keyframes meshShift {
  0%   { background-position: 0% 0%, 100% 0%, 50% 100%; }
  100% { background-position: 20% 20%, 80% 30%, 40% 70%; }
}

/* ─── Scroll Reveal ──────────────────────────────── */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ─── Accessibility ──────────────────────────────── */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
:focus-visible { outline: 2px solid var(--btc-orange); outline-offset: 2px; border-radius: 4px; }

/* ─── Scrollbar ──────────────────────────────────── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }