/* Cardiolyse — base reset & typography */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'ss01', 'cv11';
}

/* Native disable of images fallback */
img, svg, video { display: block; max-width: 100%; height: auto; }

/* Anchors */
a { color: inherit; text-decoration: none; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Headings — Alexer */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--lh-heading);
  letter-spacing: var(--tracking-tight);
  margin: 0 0 var(--space-4) 0;
  color: var(--ink);
}

h1 { font-size: var(--text-hero); font-weight: 700; line-height: var(--lh-tight); letter-spacing: -0.035em; }
h2 { font-size: var(--text-3xl); font-weight: 700; letter-spacing: -0.03em; }
h3 { font-size: var(--text-xl); font-weight: 500; letter-spacing: -0.02em; }
h4 { font-size: var(--text-lg); font-weight: 600; font-family: var(--font-body); letter-spacing: 0; }

p { margin: 0 0 var(--space-4) 0; }
p:last-child { margin-bottom: 0; }

/* Utility bits */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: var(--gutter);
}
.container--tight { max-width: var(--container-tight); }

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--accent);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: var(--space-4);
}
.eyebrow--on-dark { color: var(--c-blue-400); }

.section {
  padding-block: var(--section-y);
  position: relative;
}
.section--dark {
  background: var(--bg-dark);
  color: var(--ink-on-dark);
}
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 {
  color: var(--c-white);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 14px 26px;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--r-pill);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--c-navy-900);
  color: var(--c-white);
}
.btn--primary:hover { background: var(--c-blue-500); box-shadow: var(--shadow-blue); }

.btn--secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--border-strong);
}
.btn--secondary:hover { border-color: var(--c-navy-900); background: var(--c-navy-900); color: var(--c-white); }

.btn--on-dark {
  background: var(--c-blue-400);
  color: var(--c-navy-900);
}
.btn--on-dark:hover { background: var(--c-white); }

.btn--ghost {
  background: transparent;
  color: var(--ink);
  padding-inline: 0;
  border: none;
}
.btn--ghost::after {
  content: '→';
  transition: transform var(--dur-fast) var(--ease-out);
}
.btn--ghost:hover::after { transform: translateX(4px); }

/* Global horizontal-overflow guard.
   Use overflow-x: clip (not hidden) so position: sticky still works on the header.
   overflow-x: hidden creates a scroll container that traps sticky elements. */
html { overflow-x: clip; }
body { overflow-x: clip; max-width: 100%; }
img, svg { max-width: 100%; }

/* Card */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--space-8);
  transition: border-color var(--dur-mid) var(--ease-out),
              box-shadow var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-out);
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

/* Reveal on scroll */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Screen reader only */
.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;
}