/* ───────────────────────────────────────────────────────────────
   Arterias — Base layer: reset, layout primitives, typography, motion
   ─────────────────────────────────────────────────────────────── */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: var(--fs-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

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

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

ul {
  list-style: none;
}

::selection {
  background: rgba(124, 92, 255, 0.35);
  color: #fff;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--surface-3);
  border-radius: var(--r-full);
  border: 2px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

/* Typography helpers */
h1, h2, h3, h4 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.h1 { font-size: clamp(2.25rem, 5vw, var(--fs-5xl)); }
.h2 { font-size: clamp(1.75rem, 4vw, var(--fs-3xl)); }
.h3 { font-size: var(--fs-2xl); }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--brand-2);
}
.muted { color: var(--text-mut); }
.soft { color: var(--text-soft); }
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.mono { font-family: var(--font-mono); }

/* Layout */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--sp-5);
}
.section { padding: var(--sp-9) 0; }
.grid { display: grid; gap: var(--sp-5); }
.flex { display: flex; }
.center { display: flex; align-items: center; justify-content: center; }
.between { display: flex; align-items: center; justify-content: space-between; }
.col { flex-direction: column; }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); }
.gap-5 { gap: var(--sp-5); }
.wrap { flex-wrap: wrap; }
.text-center { text-align: center; }
.mt-2 { margin-top: var(--sp-2); }
.mt-4 { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-5); }
.mt-6 { margin-top: var(--sp-6); }
.mb-4 { margin-bottom: var(--sp-4); }
.hidden { display: none !important; }
.full { width: 100%; }

/* Aurora background used on hero + auth screens */
.aurora {
  position: relative;
  isolation: isolate;
}
.aurora::before {
  content: '';
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 120%;
  background: var(--gradient-aurora);
  filter: blur(10px);
  z-index: -1;
  pointer-events: none;
}

/* Reveal-on-scroll animation */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
[data-reveal].in {
  opacity: 1;
  transform: none;
}

/* Page transition */
@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
main { animation: pageIn var(--dur) var(--ease); }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes shimmer {
  100% { transform: translateX(100%); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 768px) {
  .section { padding: var(--sp-7) 0; }
  .container { padding: 0 var(--sp-4); }
}