/* base.css — リセット・基本要素・共通ユーティリティ。値はすべて tokens.css 経由 */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-3));
}

body {
  font-family: var(--font-sans);
  font-weight: var(--fw-regular);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--color-ink);
  background: var(--color-washi);
  -webkit-font-smoothing: antialiased;
  line-break: strict;
  overflow-wrap: anywhere;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-heading);
  text-wrap: balance;
}

a { color: inherit; }

ul, ol { padding: 0; list-style: none; }

:focus-visible {
  outline: var(--focus-width) solid var(--color-focus);
  outline-offset: var(--focus-offset);
}
.on-dark :focus-visible,
.footer :focus-visible,
.drawer :focus-visible,
.hero :focus-visible,
.page-hero :focus-visible,
.info-bar :focus-visible {
  outline-color: var(--color-focus-on-dark);
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -4rem;
  z-index: 2000;
  padding: var(--space-2) var(--space-3);
  background: var(--color-ink);
  color: var(--color-on-dark);
}
.skip-link:focus { top: var(--space-2); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.container {
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--text { max-width: var(--container-text); }

.section { padding-block: var(--section-y-top); }
.section--paper { background: var(--color-paper); }

/* スクロール時のフェードイン(JS が .is-visible を付与) */
.js .reveal {
  opacity: 0;
  transform: translateY(var(--rise));
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .js .reveal { opacity: 1; transform: none; }
}