/*
 * ============================================================
 *  BASE STYLES  —  css/base.css
 *  Reset, global element defaults, and animation scaffolding.
 * ============================================================
 */

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

/* ── Root ── */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  /* Offset anchors below sticky nav */
  scroll-padding-top: calc(var(--nav-height) + 16px);
}

/* Respect user's motion preference — disable smooth scroll */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* ── Body ── */
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: var(--leading-relaxed);
  color: var(--color-text-dark);
  background-color: var(--color-bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ── Links ── */
a {
  color: inherit;
  text-decoration: none;
}

/* ── Media ── */
img, picture, video, canvas, svg { display: block; max-width: 100%; }

/* ── Inputs ── */
input, button, textarea, select { font: inherit; }

/* ── Headings ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: var(--leading-tight);
  color: var(--color-text-dark);
}

/* ── Lists ── */
ul, ol { list-style: none; }

/* ── Section base ── */
section { padding: var(--section-pad-y) var(--section-pad-x); }

/* ── Focus styles (accessible, beautiful) ── */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ── Selection colour ── */
::selection {
  background: var(--color-primary-xlight);
  color: var(--color-primary-dark);
}


/* ============================================================
   SCROLL-REVEAL ANIMATION SYSTEM
   Elements with [data-animate] start invisible/offset.
   JS adds .is-visible via IntersectionObserver to play them.
   ============================================================ */

[data-animate] {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--anim-reveal) cubic-bezier(0.4, 0, 0.2, 1),
    transform var(--anim-reveal) cubic-bezier(0.4, 0, 0.2, 1);
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays for children of a staggered group */
[data-animate-group] > *:nth-child(1) { transition-delay: calc(var(--anim-stagger) * 0); }
[data-animate-group] > *:nth-child(2) { transition-delay: calc(var(--anim-stagger) * 1); }
[data-animate-group] > *:nth-child(3) { transition-delay: calc(var(--anim-stagger) * 2); }
[data-animate-group] > *:nth-child(4) { transition-delay: calc(var(--anim-stagger) * 3); }
[data-animate-group] > *:nth-child(5) { transition-delay: calc(var(--anim-stagger) * 4); }
[data-animate-group] > *:nth-child(6) { transition-delay: calc(var(--anim-stagger) * 5); }

[data-animate-group] > * {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-animate-group].is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Slide-in from left variant */
[data-animate="slide-left"] {
  transform: translateX(-32px);
}
[data-animate="slide-left"].is-visible {
  transform: translateX(0);
}

/* Slide-in from right variant */
[data-animate="slide-right"] {
  transform: translateX(32px);
}
[data-animate="slide-right"].is-visible {
  transform: translateX(0);
}

/* Scale-up variant */
[data-animate="scale"] {
  transform: scale(0.92);
}
[data-animate="scale"].is-visible {
  transform: scale(1);
}


/* ============================================================
   GLOBAL KEYFRAMES
   ============================================================ */

/* Gentle float for hero image */
@keyframes float {
  0%, 100% { transform: translateY(0px);   }
  50%       { transform: translateY(-12px); }
}

/* Pulse glow for CTA elements */
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 var(--color-primary-glow); }
  50%       { box-shadow: 0 0 0 12px transparent; }
}

/* Spin for decorative elements */
@keyframes spin-slow {
  to { transform: rotate(360deg); }
}

/* Shimmer for skeleton/loading states */
@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}