/* =========================================================
   base.css —— 重置、排版基线、通用原子类
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background: var(--paper-0);
  color: var(--ink-900);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  letter-spacing: var(--tracking-cjk);
  overflow-x: hidden;
  /* 极淡的暖色纸纹，避免大面积纯白的“塑料感” */
  background-image:
    radial-gradient(circle at 12% 8%, rgba(204, 165, 86, 0.06), transparent 46%),
    radial-gradient(circle at 88% 92%, rgba(204, 165, 86, 0.05), transparent 44%);
}

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

ul, ol, dl, dd { margin: 0; padding: 0; }
ul[role="list"], ol[role="list"] { list-style: none; }

p, h1, h2, h3, h4 { margin: 0; }

a {
  color: var(--gold-700);
  text-decoration: none;
  text-underline-offset: 0.24em;
  transition: color var(--dur-fast) var(--ease);
}

a:hover { color: var(--ink-900); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-cjk);
  color: var(--ink-900);
}

h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: 700; }

:focus-visible {
  outline: 2px solid var(--gold-700);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 通用原子类 ---------- */

.skip-link {
  position: absolute;
  left: var(--space-sm);
  top: -6rem;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  background: var(--ink-900);
  color: var(--paper-0);
  border-radius: var(--radius-sm);
  font-size: var(--fs-small);
}

.skip-link:focus { top: var(--space-sm); color: var(--paper-0); }

.eyebrow {
  font-family: var(--font-latin);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--gold-700);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* 眉标前置的金色细线 + 圆点，替代常见的“色块标题” */
.eyebrow::before {
  content: "";
  inline-size: 2.25rem;
  block-size: 1px;
  background: var(--grad-gold);
  flex: none;
}

.eyebrow::after {
  content: "";
  inline-size: 5px;
  block-size: 5px;
  border-radius: 50%;
  background: var(--gold-500);
  flex: none;
}

.grad-gold {
  background: var(--grad-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead-zh {
  font-size: var(--fs-lead);
  line-height: 1.85;
  color: var(--ink-900);
}

.body-en {
  font-family: var(--font-latin);
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--ink-600);
}

.dot { color: var(--gold-500); padding-inline: 0.35em; }

.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- 进场动效：仅在 JS 就绪后启用，无 JS 时内容默认可见 ---------- */

html.js-armed .reveal {
  opacity: 0;
  transform: translate3d(0, 24px, 0);
  transition:
    opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

html.js-armed .reveal.is-in {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

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

  html.js-armed .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}