:root {
  --bg: #ffffff;
  --fg: #000000;
  --card: #ffffff;
  --muted: #6b6b6b;
  --border: rgba(0, 0, 0, 0.08);
  --grid: rgba(0, 0, 0, 0.045);
  color-scheme: light;
}

html.dark {
  --bg: #0a0a0a;
  --fg: #fafafa;
  --card: #111111;
  --muted: #9a9a9a;
  --border: rgba(255, 255, 255, 0.08);
  --grid: rgba(255, 255, 255, 0.05);
  color-scheme: dark;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  background: var(--bg);
  color: var(--fg);
  transition: background-color 300ms ease, color 300ms ease;
}

::selection {
  background: #2563eb;
  color: #fff;
}

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 999px; }

.text-muted { color: var(--muted); }
.bg-surface { background: var(--card); }
.border-subtle { border-color: var(--border); }

a:focus-visible, button:focus-visible, input:focus-visible,
textarea:focus-visible, select:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid #2563eb;
  outline-offset: 3px;
  border-radius: 4px;
}

.bg-grid-pattern {
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
}

.glass {
  background: color-mix(in srgb, var(--card) 65%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
}

.link-underline {
  position: relative;
  text-decoration: none;
}
.link-underline::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 300ms ease;
}
.link-underline:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.skeleton {
  background: linear-gradient(90deg, var(--border) 25%,
    color-mix(in srgb, var(--border) 50%, transparent) 37%, var(--border) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
}
@keyframes shimmer {
  0% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

/* Scroll-reveal system driven by IntersectionObserver in main.js.
   Elements start hidden/offset, then get .is-visible added. */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

.reveal-left { opacity: 0; transform: translateX(-24px); transition: opacity 0.6s cubic-bezier(0.22,1,0.36,1), transform 0.6s cubic-bezier(0.22,1,0.36,1); }
.reveal-left.is-visible { opacity: 1; transform: translateX(0); }

.reveal-right { opacity: 0; transform: translateX(24px); transition: opacity 0.6s cubic-bezier(0.22,1,0.36,1), transform 0.6s cubic-bezier(0.22,1,0.36,1); }
.reveal-right.is-visible { opacity: 1; transform: translateX(0); }

.reveal-scale { opacity: 0; transform: scale(0.94); transition: opacity 0.6s cubic-bezier(0.22,1,0.36,1), transform 0.6s cubic-bezier(0.22,1,0.36,1); }
.reveal-scale.is-visible { opacity: 1; transform: scale(1); }

.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s cubic-bezier(0.22,1,0.36,1), transform 0.5s cubic-bezier(0.22,1,0.36,1);
}
.reveal-stagger.is-visible > * { opacity: 1; transform: translateY(0); }
.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 60ms; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 120ms; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 180ms; }
.reveal-stagger.is-visible > *:nth-child(5) { transition-delay: 240ms; }
.reveal-stagger.is-visible > *:nth-child(6) { transition-delay: 300ms; }
.reveal-stagger.is-visible > *:nth-child(7) { transition-delay: 360ms; }
.reveal-stagger.is-visible > *:nth-child(8) { transition-delay: 420ms; }
.reveal-stagger.is-visible > *:nth-child(9) { transition-delay: 480ms; }

/* Navbar hide/show */
#site-navbar {
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), background-color 0.3s ease, box-shadow 0.3s ease;
}
#site-navbar.nav-hidden { transform: translateY(-100%); }
#site-navbar.nav-scrolled { box-shadow: 0 1px 2px rgba(0,0,0,0.04), 0 8px 24px -8px rgba(0,0,0,0.08); }

/* Cursor glow (desktop only, injected by JS) */
#cursor-glow {
  position: fixed;
  top: 0; left: 0;
  width: 500px; height: 500px;
  border-radius: 9999px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.06;
  filter: blur(60px);
  background: radial-gradient(circle, #2563EB 0%, transparent 70%);
  transition: transform 0.3s ease-out;
  will-change: transform;
}
html.dark #cursor-glow { opacity: 0.10; }

/* Floating metric cards on hero mockup */
.floating-card {
  animation: floatCard 6s ease-in-out infinite;
}
@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Command palette */
#command-palette-overlay {
  display: none;
}
#command-palette-overlay.is-open {
  display: flex;
}