/* ============================================================
   开云全站 · /assets/site.css
   暖纸底 + 夜赛墨框架 + 开云青刻度
   ============================================================ */

:root {
  --ink: #0B1220;
  --teal: #0FB5A6;
  --paper: #F4EFE6;
  --paper-2: #FBF8F1;
  --spring: #FF7A45;
  --summer: #0FB5A6;
  --autumn: #E8B23A;
  --winter: #4C7DFF;
  --graphite: #2A3346;
  --rule: #8C93A3;
  --seal: #C8402A;

  --rail-w: 220px;
  --header-h: 56px;

  --border: 2px solid var(--ink);
  --shadow-hard: 6px 6px 0 var(--ink);
  --shadow-soft: 4px 4px 0 var(--ink);

  --font-display: "Source Han Serif SC", "Songti SC", "Noto Serif SC", Georgia, "Times New Roman", serif;
  --font-struct: "Inter Tight", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-data: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --read-progress: 0;
}

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

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

html,
body { margin: 0; padding: 0; }

body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  background-color: var(--paper);
  color: var(--graphite);
  font-family: var(--font-struct);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 500;
  pointer-events: none;
  opacity: 0.5;
  background-image: radial-gradient(rgba(11, 18, 32, 0.055) 0.5px, transparent 0.7px);
  background-size: 4px 4px;
}

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

img { height: auto; }

ul,
ol { margin: 0; padding: 0; }

li { list-style: none; }

button,
input,
select,
textarea { font: inherit; color: inherit; }

a {
  color: var(--ink);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

a:hover { color: var(--teal); }

[hidden] { display: none !important; }

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

/* ---------- 中文排版 ---------- */
h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h1 { font-size: clamp(32px, 4.4vw, 44px); }
h2 { font-size: clamp(24px, 3vw, 30px); }
h3 { font-size: 21px; line-height: 1.35; }
h4 { font-size: 18px; line-height: 1.4; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

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

/* ---------- 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 40px;
}

.prose { max-width: 68ch; }
.prose p { font-size: 16px; line-height: 1.75; }
.prose h3 { margin-top: 1.6em; }

.section { padding-block: 48px; }

.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 8px;
}

.bento > * { grid-column: span 12; }

@media (min-width: 768px) {
  .bento > .span-3 { grid-column: span 3; }
  .bento > .span-4 { grid-column: span 4; }
  .bento > .span-5 { grid-column: span 5; }
  .bento > .span-6 { grid-column: span 6; }
  .bento > .span-7 { grid-column: span 7; }
  .bento > .span-8 { grid-column: span 8; }
  .bento > .span-9 { grid-column: span 9; }
}

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 3px;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 900;
  padding: 10px 16px;
  background: var(--teal);
  color: var(--ink);
  font-family: var(--font-struct);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  border: var(--border);
  box-shadow: var(--shadow-soft);
}

.skip-link:focus,
.skip-link:focus-visible { top: 16px; }

/* ============================================================
   头部：左侧框架式导航轨
   ============================================================ */
.site-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--rail-w);
  z-index: 600;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 26px 20px 22px;
  background: var(--ink);
  color: var(--paper);
  border-right: var(--border);
  overflow-y: auto;
}

.site-rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: 3px;
  width: 4px;
  height: 100%;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(244, 239, 230, 0.32) 0 1px,
    transparent 1px 24px
  );
  pointer-events: none;
}

.rail-progress {
  position: fixed;
  top: 0;
  left: calc(var(--rail-w) - 3px);
  width: 3px;
  height: 100vh;
  background: var(--teal);
  transform: scaleY(var(--read-progress, 0));
  transform-origin: top center;
  pointer-events: none;
  z-index: 700;
}

.rail-top {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--paper);
  text-decoration: none;
}

.brand:hover { color: var(--paper-2); }

.brand-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 34px;
  height: 34px;
  background: var(--teal);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  border: 2px solid var(--paper);
}

.brand-name {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-family: var(--font-data);
  font-size: 10px;
  font-style: normal;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: rgba(244, 239, 230, 0.58);
}

.rail-archive {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding-left: 44px;
  border-left: 0;
}

.rail-archive-label {
  font-family: var(--font-struct);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: rgba(244, 239, 230, 0.5);
}

.rail-archive-value {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

/* 移动按钮 */
.nav-toggle { display: none; }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle-text {
  font-family: var(--font-struct);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

/* 主导航 */
.primary-nav {
  margin-top: 2px;
  border-top: 1px solid rgba(244, 239, 230, 0.16);
}

.nav-list { display: block; }

.nav-list li { border-bottom: 1px solid rgba(244, 239, 230, 0.1); }

.nav-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 10px 12px 12px;
  border-left: 2px solid transparent;
  color: rgba(244, 239, 230, 0.82);
  font-family: var(--font-struct);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.nav-list a:hover {
  background: rgba(15, 181, 166, 0.14);
  border-left-color: var(--teal);
  color: var(--paper-2);
}

.nav-list a[aria-current="page"] {
  background: rgba(15, 181, 166, 0.2);
  border-left-color: var(--teal);
  color: var(--paper-2);
}

.nav-index {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(244, 239, 230, 0.42);
}

.nav-list a[aria-current="page"] .nav-index { color: var(--teal); }

/* 轨道底部 */
.rail-foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rail-contact {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border: 2px solid rgba(244, 239, 230, 0.5);
  background: transparent;
  color: var(--paper-2);
  font-family: var(--font-struct);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.rail-contact:hover {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--ink);
}

.rail-contact-arrow { font-family: var(--font-data); }

.rail-meta {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(244, 239, 230, 0.45);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  margin-top: 72px;
  background: var(--ink);
  color: var(--paper);
  border-top: 6px solid var(--ink);
}

.footer-scale {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 16px;
  padding-inline: 40px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(244, 239, 230, 0.26) 0 1px,
    transparent 1px 16px
  );
  background-size: auto 8px;
  background-repeat: repeat-x;
  background-position: 0 50%;
}

.scale-dot {
  width: 9px;
  height: 9px;
  flex: none;
  border: 2px solid var(--ink);
  box-shadow: 0 0 0 2px rgba(244, 239, 230, 0.45);
}

.scale-dot.is-spring { background: var(--spring); }
.scale-dot.is-summer { background: var(--summer); }
.scale-dot.is-autumn { background: var(--autumn); }
.scale-dot.is-winter { background: var(--winter); }

.footer-scale-label {
  margin: 6px 0 0;
  text-align: center;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: rgba(244, 239, 230, 0.55);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.15fr;
  gap: 36px;
  padding-block: 44px 32px;
}

.footer-col { min-width: 0; }

.footer-brand-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--paper-2);
  letter-spacing: 0.01em;
}

.footer-note {
  margin: 0;
  max-width: 32ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.72);
}

.footer-heading {
  margin: 0 0 12px;
  font-family: var(--font-struct);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--teal);
  line-height: 1.4;
}

.footer-links {
  margin: 0 0 26px;
  padding: 0;
}

.footer-links li { margin-bottom: 8px; }

.footer-links a {
  color: rgba(244, 239, 230, 0.82);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(244, 239, 230, 0.22);
}

.footer-links a:hover {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

.footer-links--legal { margin-bottom: 0; }

.footer-contact { margin: 0 0 20px; }

.contact-row {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 10px;
  padding-block: 7px;
  border-bottom: 1px solid rgba(244, 239, 230, 0.14);
}

.contact-key {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(244, 239, 230, 0.5);
}

.contact-value {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(244, 239, 230, 0.9);
  word-break: break-word;
}

.footer-cta { margin-top: 4px; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 18px 0;
  border-top: 1px solid rgba(244, 239, 230, 0.18);
}

.footer-copy,
.footer-icp {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(244, 239, 230, 0.55);
}

/* ============================================================
   通用组件
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 12px 20px;
  border: var(--border);
  background: var(--paper-2);
  color: var(--ink);
  font-family: var(--font-struct);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  transition: transform 0.16s var(--ease), box-shadow 0.16s var(--ease), background-color 0.16s var(--ease);
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
  color: var(--ink);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

.btn--primary {
  background: var(--teal);
  color: var(--ink);
}

.btn--primary:hover { background: var(--teal); }

.btn--dark {
  background: var(--ink);
  color: var(--paper-2);
  border-color: var(--teal);
  box-shadow: 4px 4px 0 var(--teal);
}

.btn--dark:hover {
  color: var(--paper-2);
  box-shadow: 6px 6px 0 var(--teal);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-family: var(--font-struct);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
}

.eyebrow::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--teal);
}

.data-num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.stamp {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding: 0 6px;
  background: var(--seal);
  border: 2px solid var(--ink);
  color: var(--paper-2);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.season-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border: 1px solid currentColor;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.7;
  color: var(--graphite);
}

.season-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  background: currentColor;
}

.season-tag.is-spring { color: var(--spring); }
.season-tag.is-summer { color: var(--summer); }
.season-tag.is-autumn { color: var(--autumn); }
.season-tag.is-winter { color: var(--winter); }

.rule-scale {
  height: 12px;
  margin: 32px 0;
  border-bottom: 1px solid var(--rule);
  background-image: repeating-linear-gradient(
    90deg,
    var(--rule) 0 1px,
    transparent 1px 16px
  );
  background-size: 100% 5px;
  background-repeat: no-repeat;
  background-position: left bottom;
}

.panel {
  padding: 24px;
  background: var(--paper-2);
  border: var(--border);
  border-radius: 2px;
  box-shadow: var(--shadow-hard);
}

.panel--ink {
  background: var(--ink);
  color: var(--paper);
}

.panel--ink h2,
.panel--ink h3,
.panel--ink h4 { color: var(--paper-2); }

.panel--ink p { color: rgba(244, 239, 230, 0.78); }

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

.chip {
  appearance: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: var(--border);
  background: var(--paper-2);
  color: var(--ink);
  font-family: var(--font-struct);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: background-color 0.16s var(--ease), color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.chip:hover { background: rgba(15, 181, 166, 0.16); }

.chip[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper-2);
  box-shadow: inset 0 -3px 0 var(--teal);
}

.chip-count {
  font-family: var(--font-data);
  font-size: 11px;
  opacity: 0.75;
}

.ledger {
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--ink);
}

.ledger-row {
  position: relative;
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
  padding: 14px 16px 14px 22px;
  border-bottom: 1px solid rgba(140, 147, 163, 0.45);
  transition: background-color 0.12s linear;
}

.ledger-row::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--paper-2);
  border: 2px solid var(--ink);
}

.ledger-row:hover { background: rgba(15, 181, 166, 0.1); }

.ledger-time {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.ledger-body { min-width: 0; font-size: 15px; line-height: 1.7; }

.ledger-meta {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--rule);
}

.breadcrumb {
  margin: 0 0 24px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--rule);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--rule);
}

.breadcrumb a {
  color: var(--graphite);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 147, 163, 0.6);
}

.breadcrumb a:hover { color: var(--teal); border-bottom-color: var(--teal); }

.breadcrumb [aria-current="page"] { color: var(--ink); font-weight: 700; }

.toc {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.toc a {
  display: block;
  padding: 6px 0 6px 12px;
  border-left: 2px solid rgba(140, 147, 163, 0.45);
  color: var(--graphite);
  text-decoration: none;
}

.toc a:hover { border-left-color: var(--teal); color: var(--teal); }

.toc a.is-active {
  border-left-color: var(--teal);
  background: rgba(15, 181, 166, 0.1);
  color: var(--ink);
  font-weight: 700;
}

/* 图片容器基础规则 */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  border: var(--border);
  box-shadow: var(--shadow-hard);
  aspect-ratio: 16 / 9;
}

.media-frame img,
.media-frame svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame--pitch {
  background-color: var(--ink);
  background-image:
    linear-gradient(90deg, rgba(15, 181, 166, 0.2) 1px, transparent 1px),
    linear-gradient(rgba(15, 181, 166, 0.2) 1px, transparent 1px);
  background-size: 32px 32px;
}

.media-frame__caption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 8px 12px;
  background: rgba(11, 18, 32, 0.82);
  color: var(--paper);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
}

/* 滚动显现 */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@keyframes entryFade {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

.is-filtered-in {
  animation: entryFade 0.28s var(--ease) both;
}

/* ============================================================
   响应式：≤900px 顶栏 + 全屏刻度菜单
   ============================================================ */
@media (max-width: 900px) {
  body {
    padding-left: 0;
    padding-top: var(--header-h);
  }

  .site-rail {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    width: 100%;
    height: var(--header-h);
    padding: 0 16px;
    gap: 0;
    border-right: 0;
    border-bottom: var(--border);
    overflow: visible;
  }

  .site-rail::after { display: none; }

  .rail-progress {
    top: calc(var(--header-h) - 3px);
    left: 0;
    width: 100%;
    height: 3px;
    transform: scaleX(var(--read-progress, 0));
    transform-origin: left center;
  }

  .rail-top {
    flex: 1 1 auto;
    flex-direction: row;
    align-items: center;
    min-width: 0;
    gap: 10px;
  }

  .brand { gap: 8px; }

  .brand-mark {
    width: 28px;
    height: 28px;
    font-size: 15px;
    border-width: 1px;
  }

  .brand-name {
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
    font-size: 15px;
  }

  .brand-sub {
    margin-top: 0;
    font-size: 9px;
    letter-spacing: 0.12em;
  }

  .rail-archive { display: none; }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex: none;
    padding: 8px 12px;
    background: transparent;
    border: 2px solid rgba(244, 239, 230, 0.5);
    color: var(--paper-2);
    cursor: pointer;
  }

  .nav-toggle:hover { border-color: var(--teal); color: var(--teal); }

  .site-rail[data-open="true"] .nav-toggle {
    background: var(--teal);
    border-color: var(--teal);
    color: var(--ink);
  }

  .site-rail[data-open="true"] .nav-toggle-bar:first-child {
    transform: translateY(3px) rotate(45deg);
  }

  .site-rail[data-open="true"] .nav-toggle-bar:last-child {
    transform: translateY(-3px) rotate(-45deg);
  }

  .primary-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 600;
    margin: 0;
    padding: 16px 16px 104px;
    background: var(--ink);
    border-top: 2px solid rgba(244, 239, 230, 0.18);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s linear;
  }

  .site-rail[data-open="true"] .primary-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list a {
    padding: 16px 12px;
    font-size: 16px;
  }

  .nav-index { font-size: 12px; }

  .rail-foot { display: none; }

  .site-rail[data-open="true"] .rail-foot { display: block; }

  .rail-contact {
    position: fixed;
    right: 16px;
    bottom: 20px;
    left: 16px;
    z-index: 601;
    justify-content: center;
    background: var(--teal);
    border-color: var(--teal);
    color: var(--ink);
  }

  .rail-meta { display: none; }

  body.is-nav-open { overflow: hidden; }

  .wrap { padding-inline: 20px; }

  .footer-scale { padding-inline: 20px; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-block: 36px 24px;
  }

  .footer-note { max-width: none; }

  .ledger-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .ledger-row::before { top: 18px; }
}

@media (max-width: 520px) {
  .footer-base { justify-content: flex-start; }
  .brand-sub { display: none; }
}

/* ---------- 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;
    scroll-behavior: auto !important;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .is-filtered-in { animation: none !important; }
}