/* ============================================================
   CryptoBlocks — shared design system
   Dark (Catppuccin Mocha) + Light overrides + dot grid + nav/footer
   ============================================================ */

:root{
  /* Dark (default) — Catppuccin Mocha */
  --base:#1e1e2e; --mantle:#181825; --crust:#11111b;
  --surface0:#313244; --surface1:#45475a; --surface2:#585b70;
  --overlay0:#6c7086; --overlay1:#7f849c; --overlay2:#9399b2;
  --text:#cdd6f4; --subtext:#a6adc8; --subtext1:#bac2de;
  --blue:#89b4fa; --lavender:#b4befe; --sapphire:#74c7ec; --sky:#89dceb;
  --green:#a6e3a1; --teal:#94e2d5; --yellow:#f9e2af; --peach:#fab387;
  --red:#f38ba8; --maroon:#eba0ac; --mauve:#cba6f7; --pink:#f5c2e7;

  --dot-color: rgba(205,214,244,0.06);
  --shadow-strong: 0 40px 80px -40px rgba(0,0,0,.6);
  --shadow-med: 0 14px 30px -18px rgba(0,0,0,.6);

  --mono:'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans:'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

/* Light theme override */
[data-theme="light"]{
  --base:#ffffff;
  --mantle:#f7f7f9;
  --crust:#eef0f4;
  --surface0:#e3e5ec;
  --surface1:#cbd0db;
  --surface2:#a9afbe;
  --overlay0:#8a90a0;
  --overlay1:#6f7688;
  --overlay2:#555c70;
  --text:#1e1e2e;
  --subtext:#45475a;
  --subtext1:#585b70;

  /* Slightly darkened accents for AA contrast on white */
  --blue:#3572ea;
  --lavender:#6a78ff;
  --sapphire:#1e88c7;
  --sky:#239fbd;
  --green:#2e9b6e;
  --teal:#12a094;
  --yellow:#b08800;
  --peach:#c76a1a;
  --red:#d44a68;
  --maroon:#c35a66;
  --mauve:#7a4fd1;
  --pink:#c968a8;

  --dot-color: rgba(30,30,46,0.08);
  --shadow-strong: 0 30px 70px -30px rgba(30,30,46,.18);
  --shadow-med: 0 10px 24px -14px rgba(30,30,46,.18);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--base);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  font-feature-settings:"ss01","cv11";
  overflow-x:hidden;
  transition:background .2s ease, color .2s ease;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}

/* Dot grid + noise */
.dots{
  position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image: radial-gradient(var(--dot-color) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 60%, transparent 100%);
}
.noise{
  position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.035;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}
[data-theme="light"] .noise{opacity:.02}

main, header, footer, nav{position:relative;z-index:1}
.wrap{max-width:1240px;margin:0 auto;padding:0 28px}

/* ---------- NAV ---------- */
nav.top{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(10px);
  background: color-mix(in oklab, var(--base) 80%, transparent);
  border-bottom:1px solid var(--surface0);
}
nav.top .inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em}
.brand .mark{width:28px;height:28px;position:relative}
.brand .mark i{position:absolute;width:16px;height:16px;border-radius:5px;mix-blend-mode:screen;opacity:.95}
[data-theme="light"] .brand .mark i{mix-blend-mode:multiply;opacity:.9}
.brand .mark i.b{background:#89b4fa;top:0;left:0}
.brand .mark i.y{background:#f9e2af;top:6px;left:6px}
.brand .mark i.g{background:#a6e3a1;top:12px;left:12px}
.brand .name{font-size:16px}
.brand .name span{color:var(--overlay1);font-weight:500}
nav.top ul{display:flex;gap:6px;list-style:none;margin:0;padding:0}
nav.top ul a{padding:8px 12px;border-radius:8px;font-size:14px;color:var(--subtext);font-weight:500}
nav.top ul a:hover{background:var(--surface0);color:var(--text)}
.nav-cta{display:flex;gap:8px;align-items:center}
.nav-cta .sign{color:var(--subtext);font-size:14px;padding:8px 12px;border-radius:8px}
.nav-cta .sign:hover{background:var(--surface0);color:var(--text)}

/* Theme toggle */
.theme-toggle{
  width:34px;height:34px;border-radius:8px;
  border:1px solid var(--surface0);
  display:grid;place-items:center;color:var(--subtext);
  transition:background .15s, color .15s, border-color .15s;
}
.theme-toggle:hover{background:var(--surface0);color:var(--text);border-color:var(--surface1)}
.theme-toggle svg{width:16px;height:16px;display:block;pointer-events:none}
.theme-toggle .sun{display:none}
.theme-toggle .moon{display:block}
[data-theme="light"] .theme-toggle .sun{display:block}
[data-theme="light"] .theme-toggle .moon{display:none}
[data-theme="light"] .theme-toggle .sun{display:block}
[data-theme="light"] .theme-toggle .moon{display:none}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;border-radius:10px;font-weight:600;font-size:14.5px;
  transition:transform .08s ease, box-shadow .2s ease, background .2s;
  font-family:var(--sans);
}
.btn-primary{
  background:var(--green);color:#0f2017;
  box-shadow:0 0 0 1px color-mix(in oklab, var(--green) 60%, transparent), 0 10px 28px -12px color-mix(in oklab, var(--green) 60%, transparent);
}
[data-theme="light"] .btn-primary{color:#ffffff}
.btn-primary:hover{transform:translateY(-1px)}
.btn-ghost{background:transparent;border:1px solid var(--surface1);color:var(--text)}
.btn-ghost:hover{background:var(--surface0);border-color:var(--surface2)}
.btn .kbd{
  font-family:var(--mono);font-size:11px;color:rgba(0,0,0,.55);
  background:rgba(0,0,0,.12);padding:2px 6px;border-radius:4px;
}

/* Shared section / eyebrow */
.eyebrow-sm{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.22em;
  color:var(--blue);text-transform:uppercase;font-weight:600;
}
h2.section-title{
  font-size:clamp(32px, 4.4vw, 52px);line-height:1.02;letter-spacing:-.03em;
  margin:12px 0 14px;font-weight:800;max-width:780px;
}
p.section-sub{
  color:var(--subtext);font-size:17px;line-height:1.55;max-width:640px;margin:0;
}
.section-head{margin-bottom:56px;display:flex;justify-content:space-between;align-items:flex-end;gap:40px;flex-wrap:wrap}
.section-head .right{color:var(--overlay1);font-family:var(--mono);font-size:12px}
section{padding:110px 0;position:relative}

/* Footer */
footer{border-top:1px solid var(--surface0);background:var(--mantle);padding:56px 0 40px}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr 1fr;gap:40px}
.foot-grid h5{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--overlay1);margin:0 0 14px;font-weight:600;
}
.foot-grid ul{list-style:none;padding:0;margin:0;display:grid;gap:9px}
.foot-grid ul a{font-size:14px;color:var(--subtext)}
.foot-grid ul a:hover{color:var(--text)}
.foot-about p{color:var(--subtext);font-size:13.5px;line-height:1.55;max-width:280px;margin:14px 0 0}
.foot-bottom{
  display:flex;justify-content:space-between;align-items:center;
  margin-top:48px;padding-top:24px;border-top:1px solid var(--surface0);
  font-family:var(--mono);font-size:12px;color:var(--overlay1);
}
.foot-bottom .status{display:flex;align-items:center;gap:8px}
.foot-bottom .status i{width:6px;height:6px;border-radius:50%;background:var(--green);box-shadow:0 0 6px var(--green)}

/* Responsive */
@media (max-width:960px){
  nav.top ul{display:none}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  .foot-grid{grid-template-columns:1fr}
  section{padding:72px 0}
}