/* Reset + primitives. Flat by design: no shadows, no gradients on UI surfaces. */

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--surface-canvas);
  color: var(--color-carbon-black);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.25;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

.container {
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

/* Type */

.display-xl,
.display,
.wordmark {
  font-family: var(--font-display);
  font-weight: 400;
  text-transform: uppercase;
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
}

.display-xl {
  font-size: var(--text-display-xl);
}

.display {
  font-size: var(--text-display);
}

.heading {
  font-family: var(--font-body);
  font-size: var(--text-heading);
  font-weight: 450;
  text-transform: uppercase;
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
}

.heading-sm {
  font-size: var(--text-heading-sm);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.03em;
}

.sub {
  font-size: var(--text-subheading);
  line-height: 1.33;
  color: var(--color-slate);
}

.body-sm {
  font-size: var(--text-body-sm);
  line-height: 1.3;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: 500;
  padding: 16px 24px;
  cursor: pointer;
  border: 0;
  transition: background-color 160ms ease, color 160ms ease,
    border-color 160ms ease;
}

.btn-dark {
  background: var(--color-carbon-black);
  color: var(--color-paper-white);
  border-radius: var(--radius-button);
}

.btn-dark:hover {
  background: var(--color-graphite);
}

.btn-ghost {
  background: transparent;
  color: var(--color-slate);
  border: 1.5px solid var(--color-slate);
  border-radius: var(--radius-button-ghost);
  padding: 14.5px 24px;
}

.btn-ghost:hover {
  background: var(--color-carbon-black);
  border-color: var(--color-carbon-black);
  color: var(--color-paper-white);
}

/* Highlight: the one voltage-yellow micro-accent */

.hl {
  background: var(--color-voltage-yellow);
  padding: 0 6px;
}

/* Cards */

.card {
  background: var(--surface-card);
  border-radius: var(--radius-card);
  padding: var(--space-3);
}

.card-inverted {
  background: var(--surface-inverted);
  color: var(--color-paper-white);
}

/* Split-line reveal scaffolding (lines are animated by GSAP; without JS the
   heading simply renders as-is) */

.line-wrap {
  display: block;
  overflow: hidden;
}

.line {
  display: block;
}