@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;600&family=Noto+Serif+TC:wght@500;600&display=swap");
@import "variables.css";

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--scroll-padding);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

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

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover { color: var(--color-primary); }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: var(--leading-tight);
  text-wrap: balance;
  margin: 0 0 var(--space-4);
}

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

p:last-child { margin-bottom: 0; }

.prose { max-width: 65ch; }

.tabular-nums { font-variant-numeric: tabular-nums; }

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: calc(var(--z-toast) + 1);
  padding: var(--space-2) var(--space-4);
  background: var(--color-ink);
  color: var(--color-ink-on-dark);
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.skip-link:focus { top: var(--space-4); }

.container {
  width: min(100% - var(--space-6), var(--content-max));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-8);
}

.section--tight { padding-block: var(--space-6); }

.section--dark {
  background: var(--color-surface-dark);
  color: var(--color-ink-on-dark);
}

.section--dark a { color: oklch(0.78 0.06 240); }

.section--surface { background: var(--color-surface); }

.section__eyebrow {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-muted);
  margin-bottom: var(--space-3);
}

.section--dark .section__eyebrow { color: var(--color-muted-on-dark); }

.section__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-5);
}

.section__lead {
  font-size: var(--text-lg);
  color: var(--color-muted);
  max-width: 55ch;
}

.section--dark .section__lead { color: var(--color-muted-on-dark); }

/* Reveal — content visible by default */
.reveal {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: no-preference) {
  .reveal[data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition:
      opacity var(--duration-slow) var(--ease-out),
      transform var(--duration-slow) var(--ease-out);
  }

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