/* ============================================================
   千嬴国际指南 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #0E2340;
}

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

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

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

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

a { color: inherit; }

html.nav-open { overflow: hidden; }

/* ---------- 变量 ---------- */
:root {
  --ink: #0E2340;
  --ink-2: #16324F;
  --paper: #F4EEE2;
  --paper-2: #FBF8F1;
  --gold: #C8A24A;
  --gold-hi: #E7C97A;
  --jade: #2F7F73;
  --vermilion: #C4512B;
  --graphite: #4A4A45;
  --rule: #D8CFBC;

  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-body: var(--font-head);
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --fs-hero: clamp(44px, 8.2vw, 96px);
  --fs-xl: clamp(34px, 5.4vw, 64px);
  --fs-lg: clamp(26px, 3.4vw, 40px);
  --fs-md: clamp(21px, 2.2vw, 28px);
  --fs-sm: clamp(17px, 1.4vw, 20px);

  --shell: 1240px;
  --head-bar: 64px;
  --dur: 220ms;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 中文排版底 ---------- */
body {
  min-height: 100%;
  background-color: var(--paper);
  background-image: radial-gradient(rgba(14, 35, 64, .05) 1px, transparent 1px);
  background-size: 22px 22px;
  color: var(--graphite);
  font-family: var(--font-body);
  font-size: clamp(16px, 1.05vw, 17px);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--ink);
}

h1 { font-size: var(--fs-xl); font-weight: 900; letter-spacing: -.03em; }
h2 { font-size: var(--fs-lg); }
h3 { font-size: var(--fs-md); }
h4 { font-size: var(--fs-sm); }

p { max-width: 38em; }

a { text-decoration: none; }

strong { font-weight: 600; color: var(--ink); }

/* 焦点环：深色与浅色背景都可见 */
:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(14, 35, 64, .28);
  border-radius: 2px;
}

main:focus { outline: none; }

/* ---------- 布局基元 ---------- */
.shell {
  width: min(var(--shell), calc(100% - 40px));
  margin-inline: auto;
}

.page-offset { padding-block-start: clamp(116px, 15vh, 168px); }

.stack > * + * { margin-block-start: var(--gap, 20px); }

.prose { max-width: 38em; }
.prose > * + * { margin-block-start: 1.1em; }
.prose h2 { margin-block-start: 2.2em; }
.prose a {
  color: var(--ink);
  border-block-end: 1px solid var(--gold);
}
.prose a:hover { color: var(--vermilion); border-block-end-color: var(--vermilion); }

.hr { height: 1px; background: var(--rule); border: 0; margin: 0; }

.num,
.index-num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: .14em;
}

.index-num { font-size: 12px; color: var(--gold); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--ink-2);
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold);
  flex: none;
}

.lede {
  max-width: 34em;
  padding-inline-start: 16px;
  border-inline-start: 3px solid var(--gold);
  font-weight: 600;
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 网格 ---------- */
.grid { display: grid; gap: clamp(20px, 3vw, 40px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--7-5 { grid-template-columns: 7fr 5fr; }

@media (max-width: 900px) {
  .grid--2,
  .grid--3,
  .grid--5-7,
  .grid--7-5 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 标签与卡片 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--ink-2);
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 2px;
  white-space: nowrap;
}
.tag--gold { border-color: var(--gold); color: #8A6C22; }
.tag--jade { border-color: var(--jade); color: var(--jade); }
.tag--vermillion { border-color: var(--vermilion); color: var(--vermilion); }

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--gold-hi);
  background: rgba(14, 35, 64, .32);
  border: 1px solid rgba(200, 162, 74, .45);
  border-radius: 2px;
  white-space: nowrap;
}

.chip-btn {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 2px;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}
.chip-btn:hover { border-color: var(--gold); }
.chip-btn[aria-pressed="true"] {
  border-color: var(--jade);
  color: var(--jade);
  background: #EDF4F1;
}

.plate {
  position: relative;
  padding: clamp(20px, 2.4vw, 32px);
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 2px;
}
.plate::before,
.plate::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
}
.plate::before {
  inset-block-start: -1px;
  inset-inline-start: -1px;
  border-block-start: 2px solid var(--gold);
  border-inline-start: 2px solid var(--gold);
}
.plate::after {
  inset-block-end: -1px;
  inset-inline-end: -1px;
  border-block-end: 2px solid var(--gold);
  border-inline-end: 2px solid var(--gold);
}
.plate > * + * { margin-block-start: 14px; }

.plate--ink {
  background: var(--ink);
  border-color: rgba(200, 162, 74, .32);
  color: rgba(244, 238, 226, .82);
}
.plate--ink h2,
.plate--ink h3,
.plate--ink h4 { color: var(--paper); }

/* ---------- 技能树式路径 ---------- */
.skillpath { display: grid; gap: 0; }
.skillpath__node {
  position: relative;
  padding: 18px 0 18px 34px;
  border-inline-start: 1px solid var(--rule);
}
.skillpath__node::before {
  content: "";
  position: absolute;
  inset-block-start: 26px;
  inset-inline-start: -5px;
  width: 9px;
  height: 9px;
  background: var(--paper-2);
  border: 1px solid var(--jade);
}
.skillpath__node:first-child { border-block-start: 1px solid var(--rule); }

/* ---------- 图片容器基础规则 ---------- */
.figure {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-radius: 2px;
}
.figure > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.figure--wide { aspect-ratio: 16 / 9; }
.figure--band { aspect-ratio: 21 / 9; }
.figure--tall { aspect-ratio: 3 / 4; }
.figure--square { aspect-ratio: 1 / 1; }

.figure[data-texture]::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(115deg, rgba(231, 201, 122, .10) 0 1px, transparent 1px 9px),
    radial-gradient(120% 80% at 18% 12%, rgba(47, 127, 115, .38), transparent 62%),
    radial-gradient(90% 70% at 88% 92%, rgba(196, 81, 43, .20), transparent 60%);
}

.figure__cap {
  margin-block-start: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--graphite);
}

/* ---------- 面包屑 ---------- */
.crumbs {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--graphite);
}
.crumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.crumbs li { display: flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; color: var(--gold); }
.crumbs a { border-block-end: 1px solid var(--rule); }
.crumbs a:hover { color: var(--ink); border-block-end-color: var(--gold); }
.crumbs [aria-current="page"] { color: var(--ink); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.btn--gold { background: var(--gold); color: var(--ink); }
.btn--gold:hover { background: var(--gold-hi); }
.btn--ghost { border-color: rgba(216, 207, 188, .38); color: var(--paper); }
.btn--ghost:hover { border-color: var(--gold-hi); color: var(--gold-hi); }
.btn--ink { background: var(--ink); color: var(--paper); }
.btn--ink:hover { background: var(--ink-2); }
.btn--line { border-color: var(--ink); color: var(--ink); background: transparent; }
.btn--line:hover { border-color: var(--gold); color: #8A6C22; }

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  inset-block-start: 8px;
  inset-inline-start: 8px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--gold);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  border-radius: 2px;
  transform: translateY(-180%);
  transition: transform 180ms var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 页头 ---------- */
.log-head {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 70;
  color: var(--paper);
  background: transparent;
  border-block-end: 1px solid transparent;
  transition: background-color 320ms var(--ease), border-color 320ms var(--ease),
    box-shadow 320ms var(--ease);
}
.log-head[data-stuck],
.log-head[data-open] {
  background: var(--ink);
  border-block-end-color: rgba(200, 162, 74, .38);
  box-shadow: 0 14px 34px -28px rgba(0, 0, 0, .95);
}

.log-head__inner {
  display: flex;
  flex-direction: column;
}

.log-head__bar {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
  min-height: var(--head-bar);
  transition: min-height 320ms var(--ease);
}
.log-head[data-stuck] .log-head__bar { min-height: 58px; }

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-inline-end: auto;
  color: var(--paper);
}
.brand__mark {
  position: relative;
  flex: none;
  width: 34px;
  height: 34px;
  border: 1px solid var(--gold);
  border-radius: 50%;
}
.brand__mark::before {
  content: "";
  position: absolute;
  inset: 7px;
  border-block-start: 1px solid var(--gold-hi);
  border-inline-end: 1px solid var(--gold-hi);
  transform: rotate(45deg);
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 5px;
  height: 5px;
  background: var(--jade);
  transform: rotate(45deg);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: .03em;
  color: var(--paper);
}
.brand__note {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .16em;
  color: rgba(231, 201, 122, .84);
}

/* 导航 */
.log-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 26px);
}
.log-nav__list { display: flex; align-items: center; gap: 2px; }
.log-nav__list a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 14.5px;
  font-weight: 500;
  color: rgba(244, 238, 226, .84);
  border-radius: 2px;
  transition: color var(--dur) var(--ease);
}
.log-nav__list a::after {
  content: "";
  position: absolute;
  inset-inline: 12px;
  inset-block-end: 8px;
  height: 1px;
  background: var(--gold-hi);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 180ms var(--ease);
}
.log-nav__list a:hover { color: var(--paper); }
.log-nav__list a:hover::after { transform: scaleX(1); }
.log-nav__list a[aria-current="page"] { color: var(--gold-hi); }
.log-nav__list a[aria-current="page"]::after { background: var(--gold); transform: scaleX(1); }

.log-nav__actions { display: flex; align-items: center; gap: 8px; }

/* 目录按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 12px;
  color: var(--paper);
  border: 1px solid rgba(200, 162, 74, .42);
  border-radius: 2px;
  cursor: pointer;
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform 240ms var(--ease);
}
.nav-toggle__bars::before { inset-block-start: -5px; }
.nav-toggle__bars::after { inset-block-start: 5px; }
.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .14em;
}
.log-head[data-open] .nav-toggle__bars { background: transparent; }
.log-head[data-open] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.log-head[data-open] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* 索引签条 */
.log-head__strip {
  display: flex;
  align-items: center;
  gap: 8px;
  max-height: 44px;
  padding-block-end: 14px;
  overflow-x: auto;
  scrollbar-width: none;
  transition: max-height 320ms var(--ease), opacity 240ms var(--ease),
    padding-block-end 320ms var(--ease);
}
.log-head__strip::-webkit-scrollbar { display: none; }
.log-head__strip-label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .22em;
  color: rgba(231, 201, 122, .78);
}
.log-head[data-stuck] .log-head__strip {
  max-height: 0;
  opacity: 0;
  padding-block-end: 0;
}

/* ---------- 滚动进度与返回顶部 ---------- */
.scroll-meter {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: 2px;
  z-index: 90;
  pointer-events: none;
}
.scroll-meter__bar {
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--gold), var(--gold-hi));
}

.to-top {
  position: fixed;
  inset-inline-end: 20px;
  inset-block-end: 20px;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 46px;
  padding: 0 14px;
  color: var(--paper);
  background: var(--ink);
  border: 1px solid rgba(200, 162, 74, .45);
  border-radius: 2px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease),
    visibility 240ms var(--ease), border-color var(--dur) var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--gold-hi); }
.to-top__dial {
  position: relative;
  display: block;
  width: 20px;
  height: 20px;
  border: 1px solid var(--gold);
  border-radius: 50%;
}
.to-top__needle {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 2px;
  height: 12px;
  background: linear-gradient(180deg, var(--gold-hi) 0 50%, var(--jade) 50% 100%);
  transform-origin: center center;
  transition: transform 120ms linear;
}
.to-top__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .12em;
}

/* ---------- 页脚 ---------- */
.log-foot {
  position: relative;
  margin-block-start: clamp(64px, 10vw, 120px);
  padding-block: 68px 28px;
  background: var(--ink);
  color: rgba(244, 238, 226, .78);
  border-block-start: 1px solid var(--gold);
}
.log-foot::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  height: 10px;
  pointer-events: none;
  opacity: .55;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(200, 162, 74, .9) 0 1px,
    transparent 1px 26px
  );
}

.log-foot__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr 1.2fr;
  gap: 36px 32px;
  padding-block-start: 26px;
}

.log-foot__brand { display: flex; flex-direction: column; gap: 14px; }
.log-foot__pitch {
  max-width: 30em;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 238, 226, .72);
}

.log-foot__contact { display: flex; flex-direction: column; gap: 4px; }

.copy-btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .08em;
  color: rgba(244, 238, 226, .9);
  border-block-end: 1px solid rgba(200, 162, 74, .38);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.copy-btn:hover { color: var(--gold-hi); border-block-end-color: var(--gold-hi); }
.copy-btn[data-copied] { color: var(--gold-hi); border-block-end-color: var(--gold-hi); }
.copy-btn[data-copied]::after {
  content: "已复制";
  margin-inline-start: 10px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--jade);
}

.log-foot__col { display: flex; flex-direction: column; gap: 12px; }
.log-foot__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--gold);
}
.log-foot__text {
  max-width: 26em;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 238, 226, .74);
}
.log-foot__list { display: flex; flex-direction: column; gap: 2px; }
.log-foot__list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14.5px;
  color: rgba(244, 238, 226, .84);
  transition: color var(--dur) var(--ease);
}
.log-foot__list a:hover { color: var(--gold-hi); }

.log-foot__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 28px;
  margin-block-start: 48px;
  padding-block-start: 22px;
  border-block-start: 1px solid rgba(216, 207, 188, .18);
}
.log-foot__legal-links { display: flex; flex-wrap: wrap; gap: 6px 22px; }
.log-foot__legal-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 13.5px;
  color: rgba(244, 238, 226, .82);
  border-block-end: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.log-foot__legal-links a:hover { color: var(--gold-hi); border-block-end-color: var(--gold-hi); }

.log-foot__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  color: rgba(244, 238, 226, .58);
}

/* ---------- 显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
}
[data-reveal] {
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
[data-reveal][data-shown] {
  opacity: 1;
  transform: none;
}

[data-filter-item][hidden] { display: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .log-foot__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .log-nav {
    position: fixed;
    inset: 0;
    z-index: 65;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    gap: 0;
    padding: 104px 28px 48px;
    background: var(--ink);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    overflow-y: auto;
    transition: opacity 240ms var(--ease), transform 240ms var(--ease),
      visibility 240ms var(--ease);
  }
  .log-head[data-open] .log-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .log-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .log-nav__list a {
    min-height: 58px;
    padding: 0 4px;
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -.01em;
    border-block-end: 1px solid rgba(216, 207, 188, .14);
    border-radius: 0;
  }
  .log-nav__list a::after { display: none; }
  .log-nav__list a[aria-current="page"] { color: var(--gold-hi); }

  .log-nav__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-block-start: 26px;
  }
  .log-nav__actions .btn { width: 100%; }
}

@media (max-width: 620px) {
  .log-foot { padding-block: 52px 24px; }
  .log-foot__grid { grid-template-columns: 1fr; gap: 28px; }
  .log-foot__legal { margin-block-start: 32px; }
  .log-head__strip { padding-block-end: 12px; }
  .to-top { inset-inline-end: 12px; inset-block-end: 12px; }
  .to-top__label { display: none; }
}

@media (max-width: 420px) {
  .brand__note { letter-spacing: .1em; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .to-top { transform: none; }
  .to-top__needle { transition: none; }
}