/* ============================================================
   style.css — Reset, design tokens, base typography, layout,
   background mesh + grain, and utility classes.
   ============================================================ */

/* ---------- Non-themed design tokens ---------- */
:root {
  /* Typography */
  --font-head: "Geist", "DM Sans", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* Fluid type scale */
  --fs-hero: clamp(2.75rem, 8vw, 6rem);
  --fs-h1: clamp(2.4rem, 6vw, 4.5rem);
  --fs-h2: clamp(1.9rem, 4.4vw, 3.25rem);
  --fs-h3: clamp(1.35rem, 2.4vw, 1.9rem);
  --fs-lead: clamp(1.05rem, 1.6vw, 1.3rem);
  --fs-body: clamp(1rem, 1.1vw, 1.075rem);
  --fs-small: 0.875rem;
  --fs-eyebrow: 0.8rem;

  /* 8pt spacing system */
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 40px;
  --sp-6: 48px;
  --sp-7: 56px;
  --sp-8: 64px;
  --sp-10: 80px;
  --sp-12: 96px;
  --sp-16: 128px;
  --sp-20: 160px;

  /* Radii */
  --radius-xs: 8px;
  --radius-sm: 12px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 999px;

  /* Layout */
  --maxw: 1200px;
  --maxw-narrow: 880px;
  --pad: clamp(20px, 5vw, 64px);
  --nav-h: 72px;

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast: 0.25s;
  --dur: 0.45s;
  --dur-slow: 0.8s;

  /* Z-index scale */
  --z-bg: 0;
  --z-content: 1;
  --z-nav: 60;
  --z-overlay: 80;
  --z-cursor: 9999;
  --z-transition: 9000;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scrollbar-color: var(--accent) transparent;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color 0.5s var(--ease), color 0.5s var(--ease);
}

img,
picture,
svg,
canvas {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

input,
textarea,
select {
  font: inherit;
  color: inherit;
}

ul,
ol { list-style: none; }

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* Custom scrollbar (WebKit) */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--accent), var(--accent-3));
  border-radius: 999px;
  border: 2px solid var(--bg);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--text);
}

h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { color: var(--text-soft); }

strong { color: var(--text); font-weight: 600; }

.text-muted { color: var(--text-muted); }
.text-gradient {
  background: linear-gradient(120deg, var(--accent-3) 0%, var(--accent) 45%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.container--narrow { max-width: var(--maxw-narrow); }

.section {
  position: relative;
  padding-block: clamp(56px, 8vw, 112px);
  z-index: var(--z-content);
}
.section--tight { padding-block: clamp(40px, 6vw, 80px); }

.stack > * + * { margin-top: var(--sp-3); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent-3);
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 1.5px;
  opacity: 0.7;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.section-head {
  max-width: 720px;
  margin-bottom: clamp(40px, 6vw, 72px);
}
.section-head.is-center {
  margin-inline: auto;
  text-align: center;
}
.section-head.is-center .eyebrow::before { display: none; }
.section-head p {
  margin-top: var(--sp-2);
  font-size: var(--fs-lead);
  color: var(--text-muted);
}

/* ---------- Decorative background: gradient mesh ---------- */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  overflow: hidden;
  background: var(--bg);
}
.bg-mesh::before,
.bg-mesh::after {
  content: "";
  position: absolute;
  width: 60vmax;
  height: 60vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.9;
  will-change: transform;
}
.bg-mesh::before {
  top: -20vmax;
  left: -10vmax;
  background: radial-gradient(circle at 30% 30%, var(--mesh-1), transparent 60%),
              radial-gradient(circle at 70% 70%, var(--mesh-3), transparent 60%);
  animation: meshDrift1 26s var(--ease-in-out) infinite alternate;
}
.bg-mesh::after {
  bottom: -24vmax;
  right: -14vmax;
  background: radial-gradient(circle at 40% 40%, var(--mesh-2), transparent 60%),
              radial-gradient(circle at 60% 60%, var(--mesh-4), transparent 60%);
  animation: meshDrift2 32s var(--ease-in-out) infinite alternate;
}

/* ---------- Decorative background: grain overlay ---------- */
.bg-grain {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: var(--grain-opacity);
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

/* ---------- Utility ---------- */
.glow-text { text-shadow: 0 0 30px var(--glow); }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}
.no-scroll { overflow: hidden; }

.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
  border: 0;
}

.center { text-align: center; }
.mt-auto { margin-top: auto; }
.full-bleed { width: 100%; }

/* Grid helpers */
.grid { display: grid; gap: var(--sp-3); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }