/* ============================================================
   base.css — 复位、排版、全局纹理层
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 700px at 82% -8%, rgba(92, 65, 143, .20), transparent 62%),
    radial-gradient(900px 620px at 8% 4%, rgba(24, 38, 88, .40), transparent 60%),
    radial-gradient(700px 900px at 50% 108%, rgba(122, 97, 50, .12), transparent 65%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 40%, var(--midnight) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.72;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 星盘网格底纹：同心环 + 放射线，只做极低对比的织理 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-radial-gradient(circle at 78% 22%,
      transparent 0 118px, rgba(154, 120, 220, .055) 118px 119px),
    repeating-conic-gradient(from 0deg at 78% 22%,
      rgba(198, 161, 91, .035) 0deg .07deg, transparent .07deg 15deg),
    repeating-linear-gradient(0deg,
      transparent 0 47px, rgba(34, 42, 72, .30) 47px 48px);
  mask-image: radial-gradient(140% 100% at 60% 0%, #000 0%, rgba(0,0,0,.35) 55%, transparent 88%);
}

/* 噪点颗粒 */
.grain {
  position: fixed;
  inset: -120px;
  z-index: 9998;
  pointer-events: none;
  opacity: .30;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.42'/%3E%3C/svg%3E");
  animation: grain-drift 6s steps(5, end) infinite;
}
@keyframes grain-drift {
  0%   { transform: translate(0, 0); }
  20%  { transform: translate(-8px, 5px); }
  40%  { transform: translate(6px, -9px); }
  60%  { transform: translate(-5px, -4px); }
  80%  { transform: translate(9px, 7px); }
  100% { transform: translate(0, 0); }
}

/* —— 排版 —— */
h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: .04em;
}

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

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

/* 等宽英文标签 */
.module__en, .eyebrow__en, .panel__meta, .stat dt, .masthead__latin,
.hero__latin, .term__id, .term__clock, .rail__idx, .rail__note,
.readout dt, .readout dd, .kvline dt, .pillars__en, .tag--mono {
  font-family: var(--font-mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  font-feature-settings: "tnum" 1;
}

::selection {
  background: rgba(154, 120, 220, .34);
  color: #fff;
}

/* 焦点可见 */
:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: 3px;
}

.skiplink {
  position: absolute;
  left: -9999px;
  top: 12px;
  z-index: 10000;
  padding: 10px 16px;
  background: var(--panel-2);
  color: var(--gold-hi);
  border: 1px solid var(--gold-lo);
  font-family: var(--font-mono);
  font-size: 12px;
}
.skiplink:focus { left: 16px; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--ink-850); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--line-hard), var(--line-soft));
  border: 2px solid var(--ink-850);
}
::-webkit-scrollbar-thumb:hover { background: var(--amethyst-lo); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .grain { animation: none; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}