/* ============================================================
   Marque & Crown — global: reset · base · typography · a11y
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background-color: var(--ink);
  color: var(--parchment);
  font-family: var(--font-serif);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  position: relative;
}

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

/* —— 近阈下颗粒：暖白噪点，极低不透明度，营造印刷/羊皮纸质感 —— */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

/* —— 排版 —— */
.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: var(--track-display);
  line-height: var(--leading-tight);
  text-transform: uppercase;
  color: var(--parchment);
}

.section-label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-label);
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--gold);
}
.section-label.center { text-align: center; }
/* 标签上方一道古金细线 */
.section-label::before {
  content: "";
  display: block;
  width: 2.5rem;
  height: var(--hairline);
  margin-bottom: 1.1rem;
  background: var(--gold);
  opacity: 0.7;
}
.section-label.center::before { margin-inline: auto; }

h1, h2, h3 { font-weight: 500; }

p { text-wrap: pretty; }

a { color: var(--gold); text-decoration: none; }

/* —— 布局原语 —— */
.prose {
  max-width: var(--measure);
  margin-inline: auto;
}
section { padding-block: var(--space-section); padding-inline: var(--gutter); }

/* —— 链接：text-accent（金字 + 生长下划线） —— */
.text-accent {
  position: relative;
  color: var(--gold);
  font-family: var(--font-display);
  font-size: var(--text-label);
  letter-spacing: var(--track-label);
  text-transform: uppercase;
}
.text-accent::after {
  content: "";
  position: absolute;
  left: 0; bottom: -0.35em;
  width: 100%; height: var(--hairline);
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-expo);
}
.text-accent:hover, .text-accent:focus-visible { color: var(--gold-bright); }
.text-accent:hover::after, .text-accent:focus-visible::after { transform: scaleX(1); }

/* —— 可达性：跳转链接 + 可见焦点环 —— */
.skip-link {
  position: absolute;
  left: 50%; top: 0;
  transform: translate(-50%, -120%);
  background: var(--ink-3);
  color: var(--parchment);
  padding: 0.6rem 1rem;
  border: var(--hairline) solid var(--gold);
  z-index: 10000;
  transition: transform var(--dur-fast) var(--ease-expo);
}
.skip-link:focus { transform: translate(-50%, 0.5rem); }

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

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

/* —— reveal 基线：仅在有 JS 时隐藏，避免无 JS 内容丢失 —— */
.js .reveal { opacity: 0; transform: translateY(8px); }
.reveal.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity var(--dur-reveal) var(--ease-expo),
              transform var(--dur-reveal) var(--ease-expo);
}

/* —— reduced-motion：揭示直接到位，关闭描边/缩放/平滑滚动 —— */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1 !important; transform: none !important; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}