/* =========================================================================
   BASE — reset, elements, layout primitives. Token-driven only.
   ========================================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + var(--space-xl));
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--surface-page);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--size-md);
  font-weight: var(--weight-medium);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100dvh;
  overflow-x: hidden;
  transition: background-color var(--dur-base) var(--ease-spring),
              color var(--dur-base) var(--ease-spring);
}

/* Film grain — fixed layer only, never on scrolling content */
.grain {
  position: fixed;
  inset: 0;
  z-index: var(--z-grain);
  pointer-events: none;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

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

input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

:where(a, button, input, textarea, select, summary, [tabindex]):focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-xs);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tighter);
  text-wrap: balance;
}
h1 { font-size: var(--size-3xl); }
h2 { font-size: var(--size-2xl); }
h3 { font-size: var(--size-xl); letter-spacing: var(--tracking-tight); line-height: var(--leading-snug); }
h4 { font-size: var(--size-lg); letter-spacing: var(--tracking-tight); line-height: var(--leading-snug); }

p, li { text-wrap: pretty; }

::selection { background: var(--ramp-signal-400); color: var(--ramp-ink-900); }

/* ---------- LAYOUT PRIMITIVES ------------------------------------------ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: calc(var(--section-y) * 0.55); }

/* Inset rounded panel — the reference's signature full-bleed shape */
.panel {
  margin-inline: clamp(var(--space-2xs), 1.5vw, var(--space-md));
  border-radius: var(--radius-xl);
  background: var(--surface-panel);
  padding-block: var(--section-y);
  overflow: hidden;
  position: relative;
}
.panel--inverse {
  background: var(--surface-inverse);
  color: var(--text-on-inverse);
}
.panel--inverse .lead,
.panel--inverse .secondary { color: var(--text-on-inverse-muted); }
.panel--inverse .eyebrow { color: var(--ramp-signal-400); }

.stack > * + *,
.stack-md > * + *,
.stack-lg > * + *,
.stack-xl > * + * { margin-top: var(--flow, var(--space-sm)); }
.stack-md { --flow: var(--space-md); }
.stack-lg { --flow: var(--space-lg); }
.stack-xl { --flow: var(--space-xl); }

.grid {
  display: grid;
  gap: var(--grid-gap);
  grid-template-columns: repeat(var(--cols, 1), minmax(0, 1fr));
}
@media (min-width: 768px) {
  .grid--2 { --cols: 2; }
  .grid--3 { --cols: 2; }
  .grid--4 { --cols: 2; }
}
@media (min-width: 1080px) {
  .grid--3 { --cols: 3; }
  .grid--4 { --cols: 4; }
}

/* Editorial split: oversized heading left, support column right */
.split {
  display: grid;
  gap: var(--space-lg);
  align-items: start;
}
@media (min-width: 1080px) {
  .split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: var(--space-2xl);
  }
  .split__aside { padding-top: var(--space-2xs); }
}

/* Asymmetrical bento */
.bento { display: grid; gap: var(--grid-gap); grid-template-columns: 1fr; }
@media (min-width: 1080px) {
  .bento { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .bento__wide { grid-column: span 7; }
  .bento__tall { grid-column: span 5; grid-row: span 2; }
  .bento__half { grid-column: span 6; }
  .bento__third { grid-column: span 4; }
  .bento__narrow { grid-column: span 7; }
}

.cluster { display: flex; flex-wrap: wrap; gap: var(--space-xs); align-items: center; }

.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-sm); }
.prose h2 { margin-top: var(--space-xl); margin-bottom: var(--space-sm); }
.prose h3 { margin-top: var(--space-lg); margin-bottom: var(--space-2xs); }
.prose ul, .prose ol { margin-top: var(--space-sm); padding-left: var(--space-md); }
.prose li + li { margin-top: var(--space-3xs); }
.prose a { color: var(--text-accent); text-decoration: underline; text-underline-offset: 4px; text-decoration-thickness: 1px; }
.prose strong { font-weight: var(--weight-bold); }

/* ---------- TYPE UTILITIES --------------------------------------------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 5px var(--space-xs);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--ramp-signal-600) 10%, transparent);
  color: var(--text-accent);
  font-family: var(--font-body);
  font-size: var(--size-3xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  line-height: 1.4;
}

.display-xl { font-size: var(--size-4xl); letter-spacing: var(--tracking-tighter); line-height: var(--leading-tight); }
.accent-word { color: var(--text-accent); font-style: normal; }

.lead {
  font-size: var(--size-lg);
  font-weight: var(--weight-regular);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: var(--measure);
  letter-spacing: var(--tracking-tight);
}

.muted { color: var(--text-muted); }
.secondary { color: var(--text-secondary); }
.mono {
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}
.small { font-size: var(--size-sm); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: var(--space-2xs);
  left: var(--space-2xs);
  z-index: var(--z-toast);
  padding: var(--space-2xs) var(--space-sm);
  background: var(--surface-inverse);
  color: var(--text-on-inverse);
  border-radius: var(--radius-pill);
  transform: translateY(-220%);
  transition: transform var(--dur-fast) var(--ease-spring);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- SCROLL REVEAL — heavy, blurred fade-up --------------------- */

[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 48px, 0);
  filter: blur(10px);
  transition:
    opacity var(--dur-slow) var(--ease-entrance),
    transform var(--dur-slow) var(--ease-entrance),
    filter var(--dur-slow) var(--ease-entrance);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: transform, opacity;
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  filter: blur(0);
  will-change: auto;
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; filter: none; }
}

@media (max-width: 767px) {
  .split, .bento { gap: var(--space-md); }
  .panel { border-radius: var(--radius-lg); margin-inline: var(--space-2xs); }
}