/* Base reset + shared primitives */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--lh-normal);
  color: var(--ink);
  background: var(--bg);
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; height: auto; display: block; }

/* Ambient gradient glows — subtle atmospheric effect on dark surfaces */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1200px 700px at 12% -10%, rgba(31,169,245,0.10), transparent 60%),
    radial-gradient(1000px 600px at 88% 12%, rgba(214,75,255,0.09), transparent 55%),
    radial-gradient(900px 800px at 50% 110%, rgba(122,92,255,0.08), transparent 60%);
  pointer-events: none;
}
[data-theme="light"] body::before {
  background:
    radial-gradient(900px 500px at 12% -10%, rgba(31,169,245,0.10), transparent 60%),
    radial-gradient(800px 500px at 88% 12%, rgba(214,75,255,0.08), transparent 55%);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink-strong);
  line-height: var(--lh-tight);
}
h1 { font-size: var(--text-hero); letter-spacing: -0.035em; }
h2 { font-size: var(--text-4xl); letter-spacing: -0.028em; }
h3 { font-size: var(--text-2xl); letter-spacing: -0.02em; }
h4 { font-size: var(--text-xl); }
p  { color: var(--ink-soft); line-height: var(--lh-relaxed); }

a  {
  color: var(--ink);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}
a:hover { color: var(--brand-violet); }

/* Layout containers */
.container       { max-width: var(--container);      margin: 0 auto; padding: 0 var(--space-6); }
.container-wide  { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--space-6); }
.container-narrow{ max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--space-6); }

/* Eyebrow / kicker */
.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: transparent;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
}
.eyebrow-muted {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* Gradient text — for hero highlights */
.grad-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 22px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-med) var(--ease), background var(--dur-med) var(--ease);
  background: transparent;
  color: var(--ink);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); color: var(--ink); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--brand-gradient);
  color: #fff;
  box-shadow: 0 8px 24px rgba(122,92,255,0.35), inset 0 0 0 1px rgba(255,255,255,0.10);
}
.btn-primary:hover { box-shadow: 0 14px 36px rgba(122,92,255,0.5), inset 0 0 0 1px rgba(255,255,255,0.16); color: #fff; }

.btn-outline {
  border-color: var(--line-strong);
  background: rgba(255,255,255,0.04);
  color: var(--ink);
  backdrop-filter: blur(6px);
}
.btn-outline:hover { border-color: var(--brand-violet); background: rgba(122,92,255,0.10); }

.btn-ghost { color: var(--ink-soft); }
.btn-ghost:hover { color: var(--ink); background: rgba(255,255,255,0.04); }

.btn-sm { padding: 8px 16px; font-size: var(--text-xs); }
.btn-lg { padding: 16px 28px; font-size: var(--text-base); }

/* Navigation shell */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border-bottom: 1px solid var(--line);
  height: var(--nav-height);
}
.site-nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.brand-link {
  display: flex; align-items: center; gap: var(--space-3);
  color: var(--ink); font-weight: 700; font-size: var(--text-lg);
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}
.brand-link img { height: 32px; width: auto; }
.brand-link:hover { color: var(--ink); }

.nav-links {
  display: flex; align-items: center; gap: var(--space-6);
}
.nav-links a {
  font-size: var(--text-sm);
  color: var(--ink-soft);
  font-weight: 500;
  padding: 6px 0;
  position: relative;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px; height: 2px;
  background: var(--brand-gradient);
  border-radius: 2px;
}

.nav-actions { display: flex; align-items: center; gap: var(--space-3); }

.theme-toggle {
  width: 40px; height: 40px;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 50%;
  color: var(--ink-soft);
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.theme-toggle:hover { color: var(--ink); border-color: var(--line-strong); background: rgba(255,255,255,0.04); }
.theme-toggle .sun-icon { display: none; }
.theme-toggle .moon-icon { display: block; }
[data-theme="light"] .theme-toggle .sun-icon { display: block; }
[data-theme="light"] .theme-toggle .moon-icon { display: none; }
.theme-toggle svg { width: 18px; height: 18px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: var(--space-16) 0 var(--space-8);
  background: var(--bg-1);
  margin-top: var(--space-24);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-10);
  padding: 0 var(--space-6);
  max-width: var(--container-wide);
  margin: 0 auto;
}
.footer-col h5 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: var(--space-4);
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: var(--space-2); }
.footer-col a { color: var(--ink-soft); font-size: var(--text-sm); }
.footer-col a:hover { color: var(--ink); }

.footer-brand { margin-bottom: var(--space-4); }
.footer-brand img { height: 32px; }
.footer-brand p { color: var(--ink-mute); font-size: var(--text-sm); max-width: 32ch; margin-top: var(--space-3); }

.footer-bottom {
  max-width: var(--container-wide);
  margin: var(--space-12) auto 0;
  padding: var(--space-6);
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
  color: var(--ink-mute);
  font-size: var(--text-xs);
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
  .nav-links { display: none; }
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--brand-violet);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Selection */
::selection { background: rgba(122,92,255,0.4); color: #fff; }

/* Scrollbar */
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 6px; border: 3px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--brand-violet); }

/* Utilities */
.divider { height: 1px; background: var(--line); margin: var(--space-12) 0; }
.mono { font-family: var(--font-mono); }
.center { text-align: center; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--ink-soft);
  backdrop-filter: blur(6px);
}
.chip-brand {
  border-color: var(--line-brand);
  background: var(--brand-gradient-soft);
  color: var(--ink);
}
.chip .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--brand-violet);
  box-shadow: 0 0 8px rgba(122,92,255,0.7);
}