/* ============================================================
   ANVIL · DPS — BASE
   Reset, document shell, section framework, motion utilities.
   Requires dps-tokens.css to be loaded first.
   ============================================================ */

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

html, body {
  background: var(--obsidian);
  color: var(--platinum);
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 15px;
  line-height: 1.5;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip; /* safety vs oversized elements; clip (not hidden) keeps position:sticky working */
}

::selection { background: var(--platinum); color: var(--obsidian); }

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

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

/* Subtle atmospheric texture across the whole page */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 1200px 600px at 20% 0%, rgba(125,143,163,0.04), transparent 60%),
    radial-gradient(ellipse 800px 500px at 90% 100%, rgba(181,170,153,0.025), transparent 60%);
  pointer-events: none;
  z-index: 0;
}
body::after {
  content: '';
  position: fixed; inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent 0, transparent 2px, rgba(255,255,255,0.008) 2px, rgba(255,255,255,0.008) 3px);
  pointer-events: none;
  mix-blend-mode: overlay;
  z-index: 1;
  opacity: 0.4;
}

/* Page content sits above the atmosphere layers */
.page { position: relative; z-index: 2; }

/* ============================================================
   SECTION FRAMEWORK
   ============================================================ */

section {
  position: relative;
  padding: 96px 64px;
  border-bottom: 1px solid var(--hairline);
}

.sec-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  margin-bottom: 64px;
  align-items: start;
}

.sec-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted-chrome);
  padding-top: 8px;
}

.sec-code .dot {
  display: inline-block;
  width: 4px; height: 4px;
  background: var(--titanium-blue);
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}

.sec-title {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 40px;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--platinum);
  max-width: 720px;
}

.sec-title em {
  font-style: normal;
  color: var(--muted-chrome);
}

.sec-sub {
  margin-top: 16px;
  max-width: 560px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--cold-silver);
}

/* ============================================================
   LENIS smooth scroll (recommended baseline styles)
   ============================================================ */
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-smooth [data-lenis-prevent] { overscroll-behavior: contain; }
.lenis.lenis-stopped { overflow: hidden; }
.lenis.lenis-smooth iframe { pointer-events: none; }

/* ============================================================
   MOTION — load reveal + scroll reveal
   ============================================================ */

/* One orchestrated reveal on load */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  animation: reveal 700ms var(--ease) forwards;
}
.reveal.d1 { animation-delay: 80ms; }
.reveal.d2 { animation-delay: 200ms; }
.reveal.d3 { animation-delay: 360ms; }
.reveal.d4 { animation-delay: 500ms; }

@keyframes reveal {
  to { opacity: 1; transform: translateY(0); }
}

/* Scroll reveal — driven by scroll-reveal.js (IntersectionObserver) */
.sr {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
  will-change: opacity, transform;
}
.sr.in {
  opacity: 1;
  transform: translateY(0);
}
.sr.d1 { transition-delay: 80ms; }
.sr.d2 { transition-delay: 200ms; }
.sr.d3 { transition-delay: 360ms; }
.sr.d4 { transition-delay: 500ms; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.001ms !important;
  }
  .sr { opacity: 1; transform: none; }
}

/* ============================================================
   RESPONSIVE — section rhythm
   ============================================================ */

@media (max-width: 900px) {
  section { padding: 64px 32px; }
  .sec-head { grid-template-columns: 1fr; gap: 24px; margin-bottom: 40px; }
  .sec-title { font-size: 32px; }
}

@media (max-width: 560px) {
  section { padding: 48px 20px; }
  .sec-title { font-size: 27px; }
}