/* ==========================================================================
   365看台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件 / 响应式
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --night: #0B1E3A;
  --indigo: #123A5C;
  --archive: #0E3B36;
  --wine: #6E1F2E;
  --orange: #FF6A13;
  --lime: #B7FF3C;
  --paper: #F4F1E8;
  --ink: #101418;
  --mist: #8A9AAC;
  --amber: #F2B33D;

  --font-display: "Source Han Sans SC Heavy", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1280px;
  --gap: 24px;
  --h1: clamp(2.4rem, 6vw, 4.6rem);
  --h2: clamp(1.6rem, 3vw, 2.4rem);
  --small: 0.8125rem;

  --line-soft: rgba(138, 154, 172, 0.28);
  --line-mid: rgba(138, 154, 172, 0.45);
  --line-strong: rgba(244, 241, 232, 0.45);

  --t-fast: 140ms;
  --t-base: 180ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd, pre { margin: 0; }

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

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

a { color: inherit; text-decoration: none; }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

table { border-collapse: collapse; width: 100%; }

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

::selection { background: var(--lime); color: var(--ink); }

/* ---------- 3. 基础排版与底色 ---------- */
body {
  min-height: 100vh;
  background-color: var(--night);
  background-image:
    radial-gradient(circle at 10% -8%, rgba(18, 58, 92, 0.95), transparent 55%),
    radial-gradient(circle at 92% 2%, rgba(14, 59, 54, 0.7), transparent 52%),
    radial-gradient(circle at 50% 110%, rgba(110, 31, 46, 0.45), transparent 60%);
  background-attachment: fixed;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.12;
}

h1 { font-size: var(--h1); letter-spacing: -0.045em; }
h2 { font-size: var(--h2); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }

p { max-width: 68ch; }

strong { font-weight: 700; color: var(--paper); }

/* ---------- 4. 工具类 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.u-mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.u-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
}

.u-hl { color: var(--lime); }
.u-accent { color: var(--orange); }

.grain { position: relative; }

.grain::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(244, 241, 232, 0.055) 1px, transparent 1px);
  background-size: 4px 4px;
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--small);
  font-weight: 700;
  letter-spacing: 0.04em;
  border: 1px solid var(--ink);
  box-shadow: 3px 3px 0 var(--wine);
  transition: top var(--t-fast) var(--ease);
}

.skip-link:focus { top: 12px; }

/* ---------- 6. 页头：紧凑命令栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background-color: var(--night);
  border-bottom: 1px solid var(--line-soft);
  box-shadow: 0 8px 24px rgba(5, 12, 24, 0.45);
}

.sh-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(138, 154, 172, 0.2);
  overflow: hidden;
}

.sh-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--orange), var(--amber) 55%, var(--lime));
  transition: transform 80ms linear;
}

.sh-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 66px;
  padding-block: 12px;
}

.sh-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.sh-brand__mark {
  display: inline-grid;
  place-items: center;
  min-width: 50px;
  height: 32px;
  padding: 0 9px;
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  border: 1px solid var(--ink);
  box-shadow: 3px 3px 0 var(--wine);
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.sh-brand:hover .sh-brand__mark {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--wine);
}

.sh-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.sh-brand__name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--paper);
}

.sh-brand__tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
}

.sh-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.sh-nav__item { display: block; }

.sh-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(244, 241, 232, 0.76);
  border-bottom: 2px solid transparent;
  transition:
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.sh-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.02em;
  color: var(--amber);
  transition: color var(--t-fast) var(--ease);
}

.sh-nav__link:hover {
  color: var(--paper);
  border-bottom-color: var(--orange);
  background-color: rgba(255, 106, 19, 0.09);
  transform: translateY(-1px);
}

.sh-nav__link[aria-current="page"] {
  color: var(--lime);
  border-bottom-color: var(--lime);
  background-color: rgba(183, 255, 60, 0.1);
}

.sh-nav__link[aria-current="page"] .sh-nav__idx { color: var(--lime); }

.sh-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line-mid);
  color: var(--paper);
  transition: border-color var(--t-fast) var(--ease);
}

.sh-toggle:hover { border-color: var(--orange); }

.sh-toggle__bar {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 12px;
}

.sh-toggle__bar::before,
.sh-toggle__bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--orange);
  transition: transform var(--t-base) var(--ease), background-color var(--t-base) var(--ease);
}

.sh-toggle__bar::before { top: 0; }
.sh-toggle__bar::after { bottom: 0; }

.sh-toggle__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sh-toggle[aria-expanded="true"] .sh-toggle__bar::before {
  transform: translateY(5px) rotate(45deg);
  background: var(--lime);
}

.sh-toggle[aria-expanded="true"] .sh-toggle__bar::after {
  transform: translateY(-5px) rotate(-45deg);
  background: var(--lime);
}

/* ---------- 7. 页脚：档案夹封底 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 7vw, 88px);
  background-color: var(--night);
  background-image:
    radial-gradient(circle at 88% 0%, rgba(14, 59, 54, 0.6), transparent 55%),
    radial-gradient(circle at 4% 100%, rgba(110, 31, 46, 0.45), transparent 52%);
  border-top: 1px solid var(--line-soft);
  color: var(--paper);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(16px, 4vw, 40px);
  width: 88px;
  height: 3px;
  background: var(--orange);
}

.sf-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: clamp(24px, 3vw, 44px);
  padding-block: clamp(44px, 6vw, 76px);
}

.sf-brand { display: flex; flex-direction: column; gap: 12px; }

.sf-brand__name {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.045em;
  color: var(--paper);
  line-height: 1;
}

.sf-brand__desc {
  max-width: 34ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(244, 241, 232, 0.72);
}

.sf-stamp {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
}

.stamp {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--wine);
  box-shadow: inset 0 0 0 1px rgba(244, 241, 232, 0.5), 0 0 0 2px rgba(110, 31, 46, 0.35);
}

.sf-stamp__text { white-space: normal; }

.sf-col { display: flex; flex-direction: column; gap: 14px; }

.sf-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
}

.sf-col__title::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--orange);
  flex: 0 0 auto;
}

.sf-list { display: flex; flex-direction: column; gap: 9px; }

.sf-list a {
  display: inline-block;
  padding-block: 2px;
  font-size: 0.9375rem;
  color: rgba(244, 241, 232, 0.82);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.sf-list a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.sf-list--plain { gap: 10px; }

.sf-list--plain li {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 10px;
  align-items: baseline;
  font-size: 0.875rem;
}

.sf-key {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
}

.sf-val {
  color: rgba(244, 241, 232, 0.86);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  word-break: break-word;
}

.sf-note {
  max-width: 36ch;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
  border-left: 2px solid var(--wine);
  padding-left: 12px;
}

.sf-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 18px 26px;
  border-top: 1px dashed var(--line-soft);
}

.sf-copy,
.sf-icp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  max-width: none;
}

.sf-icp { color: rgba(242, 179, 61, 0.85); }

/* ---------- 8. 通用组件 ---------- */
.section { padding-block: clamp(44px, 7vw, 88px); }

.section__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.tape {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
}

.tape::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--orange);
  flex: 0 0 auto;
}

.tag {
  display: inline-block;
  padding: 3px 9px;
  background: var(--wine);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  border: 1px solid rgba(244, 241, 232, 0.22);
}

.idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.paper {
  position: relative;
  padding: clamp(16px, 2.4vw, 28px);
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(16, 20, 24, 0.9);
  box-shadow: 3px 3px 0 var(--wine);
}

.paper--dark {
  background: var(--indigo);
  color: var(--paper);
  border-color: var(--line-mid);
  box-shadow: 3px 3px 0 rgba(5, 12, 24, 0.55);
}

.paper--archive {
  background: var(--archive);
  color: var(--paper);
  border-color: var(--line-mid);
  box-shadow: 3px 3px 0 rgba(110, 31, 46, 0.55);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  border: 1px solid transparent;
  transition:
    transform var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    box-shadow var(--t-fast) var(--ease);
}

.btn--primary {
  background: var(--orange);
  color: var(--ink);
  border-color: rgba(16, 20, 24, 0.85);
  box-shadow: 3px 3px 0 rgba(11, 30, 58, 0.9);
}

.btn--primary:hover {
  background: #FF8236;
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 rgba(11, 30, 58, 0.9);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--paper);
}

.btn--ghost:hover {
  border-color: var(--lime);
  color: var(--lime);
  transform: translateY(-1px);
}

.btn--mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mist);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb__item[aria-current="page"] { color: var(--amber); }

.breadcrumb a { transition: color var(--t-fast) var(--ease); }

.breadcrumb a:hover { color: var(--orange); }

.breadcrumb__sep { color: rgba(138, 154, 172, 0.55); }

.prose {
  max-width: 68ch;
  color: rgba(244, 241, 232, 0.84);
  line-height: 1.75;
}

.prose h2 { margin-top: 1.6em; margin-bottom: 0.5em; color: var(--paper); }
.prose h3 { margin-top: 1.3em; margin-bottom: 0.4em; color: var(--paper); }
.prose p + p { margin-top: 1em; }
.prose ul { margin-top: 1em; display: flex; flex-direction: column; gap: 8px; }

.prose li {
  position: relative;
  padding-left: 18px;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 2px;
  background: var(--orange);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 13px;
  border: 1px solid var(--line-mid);
  color: rgba(244, 241, 232, 0.82);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  transition:
    border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease);
}

.chip:hover { border-color: var(--orange); color: var(--orange); }

.chip[aria-pressed="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
}

.rule {
  height: 0;
  border: 0;
  border-top: 1px dashed var(--line-soft);
  margin-block: clamp(20px, 3vw, 36px);
}

/* ---------- 9. 图像容器（页面阶段放置占位或图片） ---------- */
.media {
  position: relative;
  display: block;
  background: var(--indigo);
  border: 1px solid var(--line-mid);
  box-shadow: 4px 4px 0 rgba(5, 12, 24, 0.55);
  overflow: hidden;
}

.media__frame {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  background-image:
    linear-gradient(rgba(183, 255, 60, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(183, 255, 60, 0.08) 1px, transparent 1px),
    linear-gradient(160deg, rgba(18, 58, 92, 0.95), rgba(11, 30, 58, 0.98));
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(242, 179, 61, 0.85);
}

.media__caption {
  display: block;
  padding: 10px 14px;
  background: rgba(11, 30, 58, 0.9);
  border-top: 1px solid var(--line-soft);
  font-size: var(--small);
  color: var(--mist);
}

.media--wide .media__frame { aspect-ratio: 21 / 9; }
.media--square .media__frame { aspect-ratio: 1 / 1; }

.media--chart .media__frame {
  background-image:
    linear-gradient(rgba(255, 106, 19, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 106, 19, 0.16) 1px, transparent 1px),
    linear-gradient(150deg, rgba(14, 59, 54, 0.95), rgba(11, 30, 58, 0.98));
  background-size: 28px 28px, 28px 28px, 100% 100%;
}

.media--badge .media__frame {
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background-image: radial-gradient(circle at 50% 45%, rgba(110, 31, 46, 0.85), rgba(11, 30, 58, 0.98) 70%);
}

/* ---------- 10. 动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 130;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--night);
  color: var(--paper);
  border: 1px solid var(--line-mid);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity var(--t-base) var(--ease),
    transform var(--t-base) var(--ease),
    visibility var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease),
    color var(--t-base) var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover { border-color: var(--orange); color: var(--orange); }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1120px) {
  .sh-brand__tag { display: none; }
  .sh-nav__link { padding: 9px 9px; font-size: 0.8125rem; }
  .sf-grid { grid-template-columns: 1.2fr 1fr 1fr 1.2fr; }
}

@media (max-width: 1024px) {
  .span-4, .span-5 { grid-column: span 6; }
  .sf-grid { grid-template-columns: 1fr 1fr; }
  .sf-brand { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .sh-inner { min-height: 60px; padding-block: 10px; gap: 12px; }
  .sh-toggle { display: inline-flex; }

  .sh-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
    padding: 8px clamp(16px, 4vw, 40px) 18px;
    background: var(--night);
    border-bottom: 1px solid var(--line-soft);
    box-shadow: 0 18px 30px rgba(5, 12, 24, 0.55);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition:
      opacity var(--t-base) var(--ease),
      transform var(--t-base) var(--ease),
      visibility var(--t-base) var(--ease);
  }

  .sh-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .sh-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .sh-nav__link {
    width: 100%;
    padding: 14px 4px;
    font-size: 1rem;
    border-bottom: 1px dashed var(--line-soft);
    border-left: 2px solid transparent;
  }

  .sh-nav__link:hover,
  .sh-nav__link[aria-current="page"] {
    border-bottom-color: var(--line-soft);
    border-left-color: var(--orange);
    padding-left: 12px;
  }

  .sh-nav__link[aria-current="page"] { border-left-color: var(--lime); }

  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 12; }
  .grid { gap: 18px; }
}

@media (max-width: 640px) {
  .sf-grid { grid-template-columns: 1fr; gap: 28px; }
  .sf-bottom { flex-direction: column; align-items: flex-start; }
  .to-top { right: 12px; bottom: 12px; }
  h1 { letter-spacing: -0.04em; }
}

/* ---------- 12. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal { opacity: 1; transform: none; }
  .to-top { transform: none; }
  .sh-nav { transform: none; }
}