/* =========================================================
   Site Kit · 凯时平台主页
   深海蓝目录册体系 / 展览画册式排版 / 电光青单一锚点
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink-900: #061726;
  --ink-700: #0B2A44;
  --ink-500: #14476B;
  --paper: #F7F9FA;
  --mist: #D6E3E8;
  --cyan: #23E0D0;
  --teal: #0E8E86;
  --amber: #F2A63B;
  --graphite: #2B333A;
  --mute: #8A9AA3;

  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --radius-pill: 999px;
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-organic: 48px 16px 44px 12px;

  --shell-max: 1240px;
  --gutter: clamp(18px, 4vw, 40px);
  --nav-h: 80px;
  --nav-h-condensed: 60px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection { background: var(--cyan); color: var(--ink-900); }

/* ---------- 3. 中文排版与共享文本 ---------- */
.display-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(44px, 7vw, 88px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--ink-900);
}

.page-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--ink-900);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--teal);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.lede {
  font-size: clamp(17px, 1.6vw, 19px);
  line-height: 1.75;
  color: #3C464D;
  max-width: 34em;
}

.prose {
  max-width: 36em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--graphite);
}
.prose p + p { margin-top: 1em; }
.prose h2,
.prose h3 { margin-top: 1.8em; margin-bottom: .6em; }
.prose a { color: var(--teal); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--ink-900); }

.mono,
.num {
  font-family: var(--font-mono);
  letter-spacing: .01em;
}
.num { font-size: 1.06em; }

.section--dark .display-title,
.section--dark .page-title,
.section--dark .section-title { color: var(--paper); }
.section--dark .lede { color: rgba(247, 249, 250, .74); }
.section--dark .eyebrow { color: var(--cyan); }
.section--dark .prose { color: rgba(247, 249, 250, .8); }

/* ---------- 4. 布局容器与区块 ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
.container--narrow { max-width: 820px; }

.section {
  position: relative;
  padding: clamp(56px, 8vw, 104px) 0;
}
.section--dark { background: var(--ink-900); color: rgba(247, 249, 250, .86); }
.section--paper { background: var(--paper); color: var(--graphite); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(24px, 3.5vw, 44px);
}

/* ---------- 5. 网格 ---------- */
.grid { display: grid; gap: clamp(18px, 2.6vw, 32px); }
.grid--12 { grid-template-columns: repeat(12, 1fr); }

.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; }

@media (max-width: 900px) {
  .grid--12 { grid-template-columns: repeat(6, 1fr); }
  .span-4, .span-5, .span-6,
  .span-7, .span-8, .span-12 { grid-column: span 6; }
}
@media (max-width: 600px) {
  .grid--12 { grid-template-columns: 1fr; gap: 20px; }
  .span-4, .span-5, .span-6,
  .span-7, .span-8, .span-12 { grid-column: span 1; }
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: .01em;
  white-space: nowrap;
  transition: transform .18s var(--ease), background .18s var(--ease),
              color .18s var(--ease), border-color .18s var(--ease),
              box-shadow .18s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--cyan);
  color: var(--ink-900);
  box-shadow: 0 12px 26px -16px rgba(35, 224, 208, .95);
}
.btn--primary:hover { background: #4CECE1; }

.btn--ghost {
  border-color: rgba(214, 227, 232, .35);
  color: inherit;
  background: transparent;
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn--amber {
  background: var(--amber);
  color: var(--ink-900);
  box-shadow: 0 12px 26px -18px rgba(242, 166, 59, .95);
}
.btn--amber:hover { background: #FFB953; }

/* ---------- 7. 头部：悬浮胶囊导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: clamp(10px, 1.6vw, 18px) var(--gutter) 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(35, 224, 208, .7);
  z-index: 120;
  pointer-events: none;
  transition: width .1s linear;
}

.skip-link {
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translate(-50%, -180%);
  z-index: 130;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  transition: transform .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline-offset: 2px;
}

.nav-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.6vw, 22px);
  width: 100%;
  max-width: var(--shell-max);
  min-height: var(--nav-h);
  margin: 0 auto;
  padding: 8px 10px 8px clamp(16px, 2vw, 26px);
  background: rgba(6, 23, 38, .95);
  border: 1px solid rgba(214, 227, 232, .14);
  border-radius: var(--radius-pill);
  box-shadow: 0 20px 48px -28px rgba(6, 23, 38, .95),
              inset 0 0 0 1px rgba(35, 224, 208, .06);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: min-height .22s var(--ease), box-shadow .22s var(--ease),
              background .22s var(--ease);
}

.site-header[data-condensed="true"] .nav-shell {
  min-height: var(--nav-h-condensed);
  background: rgba(6, 23, 38, .98);
  box-shadow: 0 12px 30px -24px rgba(6, 23, 38, .95),
              inset 0 0 0 1px rgba(35, 224, 208, .08);
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--paper);
  text-decoration: none;
}

.brand-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(15px, 1.4vw, 17px);
  letter-spacing: -.01em;
  white-space: nowrap;
}

.brand-version {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: .08em;
  color: var(--cyan);
  border: 1px solid rgba(35, 224, 208, .42);
  border-radius: var(--radius-pill);
  padding: 4px 8px;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border: 1px solid rgba(214, 227, 232, .22);
  border-radius: var(--radius-pill);
  background: transparent;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); background: rgba(35, 224, 208, .1); }

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--paper);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-menu {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0px, .8vw, 8px);
  flex-wrap: nowrap;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  border-radius: var(--radius-pill);
  color: rgba(247, 249, 250, .76);
  font-size: 14.5px;
  font-weight: 500;
  white-space: nowrap;
  transition: color .18s var(--ease), background .18s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  width: 0;
  border-radius: 2px;
  background: var(--cyan);
  transition: width .2s var(--ease);
}
.nav-link:hover { color: #FFFFFF; }
.nav-link:hover::after { width: calc(100% - 24px); }
.nav-link[aria-current="page"] { color: #FFFFFF; }
.nav-link[aria-current="page"]::after { width: calc(100% - 24px); }

.nav-link--accent::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(242, 166, 59, .18);
}

.nav-cta {
  flex: 0 0 auto;
  padding: 11px 20px;
  font-size: 14.5px;
}

.nav-drawer-cta { display: none; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: rgba(247, 249, 250, .78);
  padding: clamp(52px, 7vw, 92px) 0 0;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -220px;
  right: -160px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(35, 224, 208, .16), rgba(35, 224, 208, 0) 70%);
  pointer-events: none;
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.35fr;
  gap: clamp(24px, 3.5vw, 54px);
}

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

.footer-col--brand {
  display: grid;
  align-content: start;
  gap: 14px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--paper);
}
.footer-brand::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(35, 224, 208, .14);
}
.footer-brand:hover { color: var(--cyan); }

.footer-tagline {
  max-width: 24em;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 249, 250, .64);
}

.footer-version {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mute);
}
.footer-heading::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.footer-list { display: grid; gap: 9px; }

.footer-link {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14.5px;
  color: rgba(247, 249, 250, .76);
  transition: color .18s var(--ease);
}
.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width .2s var(--ease);
}
.footer-link:hover { color: var(--cyan); }
.footer-link:hover::after { width: 100%; }

.footer-contact {
  display: grid;
  gap: 14px;
}
.footer-contact li {
  display: grid;
  justify-items: start;
  gap: 3px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mute);
}

.contact-value {
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(247, 249, 250, .9);
  overflow-wrap: anywhere;
}

.contact-note {
  max-width: 34em;
  margin-top: 16px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mute);
}

.copy-btn {
  margin-top: 2px;
  padding: 3px 10px;
  border: 1px solid rgba(35, 224, 208, .35);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan);
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.copy-btn:hover { background: rgba(35, 224, 208, .14); }
.copy-btn[data-copied="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: clamp(32px, 5vw, 56px);
  padding: 20px 0 28px;
  border-top: 1px solid rgba(214, 227, 232, .16);
  font-size: 12.5px;
  color: var(--mute);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.footer-legal .mono { font-size: 12.5px; color: rgba(247, 249, 250, .8); }

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.footer-meta .mono { color: var(--cyan); font-size: 12.5px; }

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid rgba(35, 224, 208, .5);
  background: var(--ink-700);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .22s var(--ease), transform .22s var(--ease),
              visibility .22s var(--ease), background .18s var(--ease);
}
.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top:hover { background: var(--ink-500); }

/* ---------- 9. 通用组件 ---------- */
.card {
  background: #FFFFFF;
  border: 1px solid var(--mist);
  border-radius: 24px;
  padding: clamp(18px, 2.4vw, 28px);
  transition: border-color .2s var(--ease), transform .2s var(--ease),
              box-shadow .2s var(--ease);
}
.card:hover {
  border-color: rgba(35, 224, 208, .55);
  transform: translateY(-2px);
  box-shadow: 0 22px 44px -34px rgba(6, 23, 38, .7);
}

.card--dark {
  background: var(--ink-700);
  border-color: rgba(214, 227, 232, .16);
  color: rgba(247, 249, 250, .82);
}
.card--dark:hover { border-color: rgba(35, 224, 208, .5); }

.panel {
  background: var(--ink-700);
  border: 1px solid rgba(35, 224, 208, .18);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 3vw, 36px);
  color: rgba(247, 249, 250, .82);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(14, 142, 134, .24);
  background: rgba(14, 142, 134, .1);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--teal);
}
.section--dark .tag,
.card--dark .tag,
.panel .tag {
  border-color: rgba(35, 224, 208, .3);
  background: rgba(35, 224, 208, .1);
  color: var(--cyan);
}

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  background: #FFFFFF;
  border: 1px solid var(--mist);
  border-radius: 24px;
}
.compare-col { padding: clamp(18px, 2.6vw, 30px); }
.compare-col + .compare-col { border-left: 1px solid var(--cyan); }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 6px 0;
}

.filter-btn {
  padding: 9px 18px;
  border: 1px solid var(--mist);
  border-radius: var(--radius-pill);
  background: #FFFFFF;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-700);
  transition: background .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease);
}
.filter-btn:hover { border-color: var(--cyan); color: var(--teal); }
.filter-btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mute);
}
.breadcrumb a { color: var(--teal); }
.breadcrumb a:hover { color: var(--ink-900); }
.breadcrumb span { color: var(--mute); }
.section--dark .breadcrumb,
.section--dark .breadcrumb a { color: var(--cyan); }

/* 图片容器基础规则（供页面阶段放置占位或图片） */
.media {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: 24px;
  background: var(--ink-700);
  border: 1px solid rgba(214, 227, 232, .14);
}
.media img,
.media svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media--wide { aspect-ratio: 16 / 7; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media--panel { border-radius: var(--radius-organic); }

/* 无障碍隐藏 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 10. 动效 ---------- */
.has-reveal .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .28s ease-out, transform .28s ease-out;
}
.has-reveal .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes filterIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
.filter-enter { animation: filterIn .28s ease-out both; }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-link { padding: 9px 10px; font-size: 14px; }
  .nav-cta { padding: 10px 16px; font-size: 14px; }
}

@media (max-width: 1000px) {
  .nav-shell {
    min-height: var(--nav-h-condensed);
    padding: 8px 10px 8px 16px;
    gap: 10px;
  }
  .nav-toggle { display: inline-flex; }
  .nav-cta { display: none; }

  .nav-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    flex: 0 0 auto;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 14px;
    background: rgba(6, 23, 38, .98);
    border: 1px solid rgba(214, 227, 232, .16);
    border-radius: var(--radius-lg);
    box-shadow: 0 28px 60px -32px rgba(0, 0, 0, .95);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
  }
  .nav-menu[data-open="true"] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    width: 100%;
    flex-wrap: nowrap;
  }
  .nav-link {
    width: 100%;
    padding: 12px 14px;
    border-radius: 14px;
    font-size: 15px;
  }
  .nav-link::after { display: none; }
  .nav-link:hover { background: rgba(35, 224, 208, .1); }
  .nav-link[aria-current="page"] {
    background: rgba(35, 224, 208, .14);
    color: var(--cyan);
  }
  .nav-drawer-cta {
    display: inline-flex;
    width: 100%;
    margin-top: 4px;
  }

  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .compare { grid-template-columns: 1fr; }
  .compare-col + .compare-col {
    border-left: 0;
    border-top: 1px solid var(--cyan);
  }
  .section-head { align-items: flex-start; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .brand-version { padding: 3px 6px; font-size: 10.5px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .to-top { width: 46px; height: 46px; }
}

@media (max-width: 420px) {
  .brand-version { display: none; }
}

/* ---------- 12. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .has-reveal .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
  .filter-enter { animation: none !important; }
  .scroll-progress { transition: none !important; }
  .btn:hover,
  .card:hover,
  .to-top { transform: none !important; }
}