/* ==========================================================================
   Empovio — Base
   Reset, typography, layout primitives, focus states, motion utilities.
   ========================================================================== */

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

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  /* Sticky nav + announcement bar height, so anchor links are not hidden. */
  scroll-padding-top: 120px;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  line-height: var(--lh-body);
  color: var(--text-primary);
  background-color: var(--surface-card);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Mobile rule: no horizontal scrolling, ever. */
  overflow-x: hidden;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

/* --------------------------------------------------------------------------
   Typography scale
   -------------------------------------------------------------------------- */

h1,
h2,
h3,
h4 {
  font-weight: var(--fw-bold);
  line-height: var(--lh-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--text-primary);
  text-wrap: balance;
}

.t-hero {
  font-size: clamp(36px, 5.2vw, var(--fs-hero));
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
  font-weight: var(--fw-bold);
}

.t-display {
  font-size: clamp(32px, 4.4vw, var(--fs-display));
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
  font-weight: var(--fw-bold);
}

.t-h1 {
  font-size: clamp(30px, 3.6vw, var(--fs-h1));
  letter-spacing: var(--tracking-tight);
  font-weight: var(--fw-bold);
}

.t-h2 {
  font-size: clamp(26px, 2.8vw, var(--fs-h2));
  font-weight: var(--fw-bold);
}

.t-h3 {
  font-size: clamp(20px, 2vw, var(--fs-h3));
  font-weight: var(--fw-semibold);
}

.t-h4 {
  font-size: var(--fs-h4);
  font-weight: var(--fw-semibold);
}

.t-body {
  font-size: var(--fs-body);
  line-height: var(--lh-body);
}

.t-small {
  font-size: var(--fs-small);
  line-height: var(--lh-snug);
}

.t-caption {
  font-size: var(--fs-caption);
  line-height: var(--lh-snug);
}

.t-muted {
  color: var(--text-secondary);
}

.t-lead {
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: var(--lh-body);
  color: var(--text-secondary);
  text-wrap: pretty;
}

/* --------------------------------------------------------------------------
   Layout primitives
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: calc(var(--content) + var(--page-padding) * 2);
  margin-inline: auto;
  padding-inline: var(--page-padding);
}

.section {
  padding-block: var(--section-y);
  position: relative;
}

.section--alt {
  background-color: var(--surface-page);
  border-block: 1px solid var(--border);
}

.section--tight {
  padding-block: var(--sp-64);
}

.stack-8 > * + * {
  margin-top: var(--sp-8);
}
.stack-12 > * + * {
  margin-top: var(--sp-12);
}
.stack-16 > * + * {
  margin-top: var(--sp-16);
}
.stack-24 > * + * {
  margin-top: var(--sp-24);
}

.grid {
  display: grid;
  gap: var(--gutter);
}

/* --------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */

.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;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--r-xs);
}

.skip-link {
  position: absolute;
  left: var(--sp-16);
  top: var(--sp-8);
  z-index: 200;
  transform: translateY(-200%);
  background: var(--n-900);
  color: var(--n-0);
  padding: var(--sp-12) var(--sp-16);
  border-radius: var(--r-button);
  font-size: var(--fs-small);
  font-weight: var(--fw-semibold);
  transition: transform var(--t-micro) var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Scroll reveal — animates once, then stays put (Part N).
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--t-reveal) var(--ease-out),
    transform var(--t-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

.reveal--scale {
  transform: translateY(16px) scale(0.985);
}

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

/* --------------------------------------------------------------------------
   Reduced motion: honour the user's system preference everywhere.
   -------------------------------------------------------------------------- */

@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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}