/* Base styles — reset, typography, accessibility defaults (Clinical) */

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

/* Headings — Syne, uppercase, tight. The oversized clinical display voice. */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
  text-transform: uppercase;
  margin: 0 0 var(--space-6);
  color: var(--color-ink);
}

h1 { font-size: clamp(2.6rem, 6.5vw, 5rem); letter-spacing: -0.045em; }
h2 { font-size: clamp(2rem, 4vw, 3.4rem); }
h3 { font-size: var(--text-xl); font-weight: 700; }
h4 { font-size: var(--text-lg); font-weight: 700; }

p {
  margin: 0 0 var(--space-4);
  max-width: 62ch;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--duration-fast) var(--ease-standard);
}
a:hover { color: var(--color-accent-hover); }

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.visually-hidden {
  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 {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  background: var(--color-ink);
  color: var(--color-surface);
  padding: var(--space-2) var(--space-4);
  z-index: 1000;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  transition: top var(--duration-fast) var(--ease-standard);
}
.skip-link:focus { top: var(--space-4); }

/* Eyebrow / mono label — the clinical instrument tag */
.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--space-6);
}

hr.rule {
  border: none;
  border-top: 1px solid var(--color-line);
  margin: var(--space-16) 0;
}

.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-8);
}
.container--narrow { max-width: var(--content-narrow); }

@media (max-width: 640px) {
  .container { padding-inline: var(--space-6); }
}

section {
  padding-block: var(--space-32);
}
@media (max-width: 640px) {
  section { padding-block: var(--space-20); }
}

.section--surface { background: var(--color-surface); }
.section--deep {
  background: var(--color-deep);
  color: var(--color-on-dark);
}
.section--deep h1,
.section--deep h2,
.section--deep h3 { color: var(--color-surface); }

/* Scroll reveal — gated behind .js so content shows without scripts */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease-standard), transform 0.7s var(--ease-standard);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] { opacity: 1; transform: none; }
}