/* ==========================================================================
   GSA — Reset, typography primitives, layout helpers
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  /* clip (not hidden) so position: sticky keeps working on the header */
  overflow-x: clip;
}

body {
  margin: 0;
  background: var(--pure-white);
  color: var(--ink-body);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.is-locked { overflow: hidden; }

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-sm);
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 700;
  line-height: var(--lh-heading);
  letter-spacing: var(--tracking-tight);
}

h1 { font-size: var(--fs-h1); line-height: var(--lh-tight); font-weight: 800; }
h2 { font-size: var(--fs-h2); font-weight: 800; }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }
h5 { font-size: var(--fs-h5); }
h6 { font-size: var(--fs-h6); }

p { margin: 0 0 var(--space-sm); }
p:last-child { margin-bottom: 0; }

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

ul, ol { margin: 0; padding: 0; }
li { list-style: none; }

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

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

button { cursor: pointer; border: 0; background: none; }

strong, b { font-weight: 700; color: var(--ink); }

hr {
  border: 0;
  height: 1px;
  background: var(--line-light);
  margin: var(--space-lg) 0;
}

::selection {
  background: var(--sea-300);
  color: var(--text-primary);
}

:focus-visible {
  outline: 2px solid var(--sea-600);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* Scrollbar ---------------------------------------------------------------- */
body::-webkit-scrollbar { width: 9px; }
body::-webkit-scrollbar-track { background: var(--surface-1); }
body::-webkit-scrollbar-thumb {
  background: var(--sea-500);
  border-radius: var(--radius-pill);
}

/* Layout ------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  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: var(--section-y-tight); }
.section--flush-top { padding-top: 0; }
.section--flush-bottom { padding-bottom: 0; }

.grid { display: grid; gap: var(--space-lg); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.flow > * + * { margin-top: var(--space-sm); }
.stack-sm { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.stack-md { display: flex; flex-wrap: wrap; gap: var(--space-md); align-items: center; }

/* Bands -------------------------------------------------------------------- */
/* 65% — white and soft backgrounds */
.band-light { background: var(--pure-white); }
.band-paper { background: var(--cloud-white); }
.band-paper-3 { background: var(--mint-white); }

/* 20% — mint and aqua surfaces */
.band-mint {
  background: var(--soft-mint);
  position: relative;
  isolation: isolate;
}

.band-mint::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(60% 80% at 6% 0%, rgba(122, 223, 208, 0.28), transparent 60%),
    radial-gradient(52% 70% at 96% 100%, rgba(131, 214, 153, 0.24), transparent 62%);
  pointer-events: none;
}

.band-aqua {
  background: var(--aqua-mist);
  position: relative;
  isolation: isolate;
}

.band-aqua::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(58% 76% at 92% 4%, rgba(140, 236, 243, 0.3), transparent 62%),
    radial-gradient(56% 72% at 0% 96%, rgba(213, 247, 240, 0.85), transparent 60%);
  pointer-events: none;
}

/* 5% — deep accent surfaces (stats anchor, closing CTA, footer) */
.band-dark,
.band-deep {
  background: var(--deep);
  color: var(--on-deep-body);
  position: relative;
  isolation: isolate;
}

.band-dark h1, .band-deep h1,
.band-dark h2, .band-deep h2,
.band-dark h3, .band-deep h3,
.band-dark h4, .band-deep h4,
.band-dark h5, .band-deep h5,
.band-dark h6, .band-deep h6,
.band-dark strong, .band-deep strong { color: var(--on-deep); }

.band-dark::before,
.band-deep::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(68% 90% at 8% 0%, rgba(60, 191, 168, 0.22), transparent 62%),
    radial-gradient(58% 74% at 94% 100%, rgba(92, 203, 111, 0.2), transparent 60%);
  pointer-events: none;
}

.band-dark--plain::before { display: none; }

/* Atmosphere: fine grain, deep surfaces only */
.has-grain::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.22;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.42'/%3E%3C/svg%3E");
}

.band-mint.has-grain::after,
.band-aqua.has-grain::after { opacity: 0.1; }

/* Typographic utilities ----------------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-family: var(--font-display);
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--brand-ink);
  margin-bottom: var(--space-sm);
}

.band-dark .eyebrow,
.band-deep .eyebrow { color: var(--sea-400); }

.eyebrow::before {
  content: "";
  width: 34px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--rule);
}

.lead {
  font-size: var(--fs-lead);
  line-height: 1.62;
  color: var(--ink-body);
}

.band-dark .lead,
.band-deep .lead { color: var(--on-deep-body); }

.muted { color: var(--ink-muted); }
.band-dark .muted,
.band-deep .muted { color: var(--on-deep-muted); }

.accent { color: var(--brand-ink); }
.band-dark .accent,
.band-deep .accent { color: var(--sea-400); }

.pull-quote {
  font-family: var(--font-quote);
  font-style: italic;
  font-size: clamp(1.1rem, 1rem + 0.65vw, 1.5rem);
  line-height: 1.55;
  color: var(--ink);
  border-left: 3px solid var(--sea-500);
  padding-left: var(--space-md);
}

.band-dark .pull-quote,
.band-deep .pull-quote { color: var(--on-deep); border-left-color: var(--sea-400); }

.rule {
  width: 96px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--rule);
  margin-top: var(--space-md);
}

.text-center { text-align: center; }
.text-center .eyebrow,
.text-center .rule { margin-inline: auto; }

.sec-head { max-width: 720px; margin-bottom: clamp(2rem, 1.4rem + 1.8vw, 3.25rem); }
.sec-head.text-center { margin-inline: auto; }
.sec-head p { color: var(--ink-body); }
.band-dark .sec-head p,
.band-deep .sec-head p { color: var(--on-deep-body); }

.sec-head--split {
  max-width: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
  gap: var(--space-lg);
  align-items: end;
}

/* Scroll-reveal motion ------------------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity 780ms var(--ease-out) var(--reveal-delay, 0ms),
    transform 780ms var(--ease-out) var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.reveal--left { transform: translateX(-32px); }
.reveal--right { transform: translateX(32px); }
.reveal--zoom { transform: scale(0.94); }
.reveal--mask { clip-path: inset(0 0 100% 0); transform: none; }

.reveal.is-in {
  opacity: 1;
  transform: none;
  clip-path: inset(0 0 0 0);
  will-change: auto;
}

/* Line-by-line headline reveal */
.split-line { display: block; overflow: hidden; }

.split-line > span {
  display: block;
  transform: translateY(105%);
  transition: transform 900ms var(--ease-out) var(--line-delay, 0ms);
}

.is-in .split-line > span,
.split-line.is-in > span { transform: translateY(0); }

/* Accessibility helpers ----------------------------------------------------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: var(--gutter);
  z-index: 200;
  background: var(--brand);
  color: var(--pure-white);
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 0; }