/* ==========================================================
   Base — reset, typography, layout primitives
   ========================================================== */

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-display);
  text-wrap: balance;
}

p {
  margin: 0;
}

a {
  color: inherit;
}

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

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

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --- layout primitives --- */
.wrap {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 1rem + 2vw, 3rem);
}

.prose {
  max-width: 34em;
}

section {
  padding-block: var(--space-section);
  scroll-margin-top: 5rem;
}

section.tint {
  background: var(--surface);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--font-body);
  font-size: var(--text-eyebrow);
  font-weight: 700;
  letter-spacing: 0.13em;
  color: var(--blue);
}

.eyebrow::before {
  content: '';
  width: 1.5em;
  height: 3px;
  border-radius: 2px;
  background: currentColor;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.section-head h2 {
  font-size: var(--text-h2);
  font-weight: 900;
  line-height: 1.4;
}

.section-head .sub {
  color: var(--ink-soft);
  font-size: 0.95rem;
  max-width: 40em;
}

.section-head.centered {
  align-items: center;
  text-align: center;
}

/* Visible only to screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translate(-50%, -120%);
  z-index: 100;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  padding: 0.7rem 1.4rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  text-decoration: none;
  transition: transform var(--dur) var(--ease-out-expo);
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

/* --- scroll reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity var(--dur-slow) var(--ease-out-expo),
    transform var(--dur-slow) var(--ease-out-expo);
  transition-delay: var(--d, 0ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* --- hero entrance stagger --- */
.rise {
  opacity: 0;
  transform: translateY(24px);
  animation: riseIn 900ms var(--ease-out-expo) forwards;
}

@keyframes riseIn {
  to {
    opacity: 1;
    transform: none;
  }
}

.d1 { animation-delay: 60ms; }
.d2 { animation-delay: 180ms; }
.d3 { animation-delay: 300ms; }
.d4 { animation-delay: 420ms; }
.d5 { animation-delay: 540ms; }
.d6 { animation-delay: 300ms; }

/* --- reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal,
  .rise {
    opacity: 1 !important;
    transform: none !important;
  }
}