/* ==========================================================================
   U米官网 · Site Kit 共享层（/assets/site.css）
   入口地图式编辑部版式：米白纸面 + 信号橙路标 + 深墨蓝锚点
   1 重置 / 2 变量 / 3 基础排版 / 4 跳链 / 5 头部 / 6 页脚
   7 按钮 / 8 排版组件 / 9 布局网格 / 10 内容组件 / 11 动效 / 12 响应式
   ========================================================================== */

/* 1. 重置 ---------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

ul, ol { padding: 0; }

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

button { font: inherit; color: inherit; }

a { color: inherit; }

:where(h1, h2, h3, h4) { text-wrap: balance; }

/* 2. 变量 ---------------------------------------------------------------- */
:root {
  --umi-paper: #F7F1E3;
  --umi-card: #FFFDF7;
  --umi-ink: #16283D;
  --umi-signal: #F26B2A;
  --umi-amber: #F6B27A;
  --umi-warm: #E4DACB;
  --umi-old: #6E8FA6;
  --umi-new: #2F7D6D;
  --umi-text: #4F5D6B;
  --umi-line: #C9BFAF;

  --umi-sans: system-ui, -apple-system, "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --umi-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --umi-max: 1180px;
  --umi-narrow: 68ch;
  --umi-gutter: clamp(18px, 4vw, 40px);

  --umi-r-sm: 10px;
  --umi-r-md: 18px;
  --umi-r-lg: 26px;
  --umi-r-pill: 999px;

  --umi-shadow-card: 0 1px 0 rgba(201, 191, 175, .8), 0 18px 34px -28px rgba(22, 40, 61, .55);
  --umi-shadow-float: 0 14px 34px -20px rgba(22, 40, 61, .55), inset 0 1px 0 rgba(255, 255, 255, .7);
  --umi-shadow-float-deep: 0 20px 44px -22px rgba(22, 40, 61, .7), inset 0 1px 0 rgba(255, 255, 255, .7);

  --umi-ease: cubic-bezier(.22, .61, .36, 1);
}

/* 3. 基础排版 ------------------------------------------------------------ */
body {
  background-color: var(--umi-paper);
  background-image:
    radial-gradient(rgba(22, 40, 61, .055) 1px, transparent 1.2px),
    linear-gradient(180deg, rgba(246, 178, 122, .16), rgba(246, 178, 122, 0) 420px);
  background-size: 24px 24px, 100% 420px;
  background-repeat: repeat, no-repeat;
  color: var(--umi-ink);
  font-family: var(--umi-sans);
  font-size: clamp(15.5px, .55vw + 14px, 17px);
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

:focus-visible {
  outline: 3px solid var(--umi-signal);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* 4. 跳链 ---------------------------------------------------------------- */
.umi-skip {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--umi-r-pill);
  background: var(--umi-ink);
  color: var(--umi-card);
  font-size: .88rem;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  transform: translate(-50%, -180%);
  transition: transform .18s var(--umi-ease);
}

.umi-skip:focus-visible {
  transform: translate(-50%, 0);
}

/* 5. 头部 ---------------------------------------------------------------- */
.umi-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: 0 clamp(12px, 2.6vw, 30px);
  font-family: var(--umi-sans);
  color: var(--umi-ink);
}

.umi-progress {
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: rgba(22, 40, 61, .1);
  overflow: hidden;
  pointer-events: none;
}

.umi-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--umi-signal), var(--umi-amber));
}

.umi-header__rail {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: var(--umi-max);
  max-height: 60px;
  margin: 0 auto;
  padding: 10px 4px 8px;
  overflow: hidden;
  font-family: var(--umi-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--umi-text);
  transition: max-height .3s var(--umi-ease), opacity .2s var(--umi-ease), padding .3s var(--umi-ease);
}

.umi-header[data-scrolled="true"] .umi-header__rail {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
}

.umi-rail__coord {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--umi-ink);
}

.umi-rail__coord::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--umi-signal);
  box-shadow: 0 0 0 3px rgba(242, 107, 42, .18);
}

.umi-rail__line {
  flex: 1 1 auto;
  height: 1px;
  background-image: repeating-linear-gradient(90deg, var(--umi-line) 0 6px, transparent 6px 13px);
}

.umi-rail__meta {
  flex: 0 0 auto;
  white-space: nowrap;
  color: var(--umi-text);
}

.umi-header__bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 24px);
  max-width: var(--umi-max);
  margin: 0 auto 12px;
  padding: 8px 10px 8px 12px;
  border: 1px solid rgba(201, 191, 175, .95);
  border-radius: var(--umi-r-pill);
  background: rgba(255, 253, 247, .74);
  box-shadow: var(--umi-shadow-float);
  backdrop-filter: blur(14px) saturate(1.25);
  -webkit-backdrop-filter: blur(14px) saturate(1.25);
  transition: box-shadow .24s var(--umi-ease);
}

.umi-header[data-scrolled="true"] .umi-header__bar {
  box-shadow: var(--umi-shadow-float-deep);
}

/* 品牌 */
.umi-brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 2px 4px 2px 2px;
  border-radius: var(--umi-r-pill);
  text-decoration: none;
  color: var(--umi-ink);
}

.umi-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 13px;
  background: var(--umi-ink);
  color: var(--umi-card);
  font-size: .92rem;
  font-weight: 800;
  letter-spacing: -.02em;
  transition: background-color .18s var(--umi-ease), color .18s var(--umi-ease);
}

.umi-brand__mark::after {
  content: "";
  position: absolute;
  right: -3px;
  bottom: -3px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--umi-signal);
  border: 2px solid var(--umi-card);
}

.umi-brand:hover .umi-brand__mark {
  background: var(--umi-signal);
  color: var(--umi-ink);
}

.umi-brand__text {
  display: block;
  line-height: 1.2;
}

.umi-brand__label {
  display: block;
  font-size: .96rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.umi-brand__helper {
  display: block;
  font-family: var(--umi-mono);
  font-size: .62rem;
  letter-spacing: .1em;
  color: var(--umi-text);
  margin-top: 2px;
}

/* 主导航 */
.umi-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.umi-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 100%;
}

.umi-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 9px 11px;
  border-radius: var(--umi-r-pill);
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: 0;
  white-space: nowrap;
  text-decoration: none;
  color: var(--umi-ink);
  transition: background-color .16s var(--umi-ease), color .16s var(--umi-ease);
}

.umi-nav__link:hover {
  background: rgba(246, 178, 122, .38);
}

.umi-nav__link[aria-current="page"] {
  background: var(--umi-ink);
  color: var(--umi-card);
}

.umi-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 15px;
  height: 2px;
  border-radius: 2px;
  background: var(--umi-signal);
  transform: translateX(-50%);
}

/* 移动导航按钮 */
.umi-nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 14px 9px 12px;
  border: 1px solid var(--umi-line);
  border-radius: var(--umi-r-pill);
  background: rgba(255, 253, 247, .92);
  color: var(--umi-ink);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background-color .16s var(--umi-ease), border-color .16s var(--umi-ease);
}

.umi-nav-toggle:hover {
  background: rgba(246, 178, 122, .4);
  border-color: var(--umi-amber);
}

.umi-nav-toggle__glyph {
  display: grid;
  gap: 3px;
  width: 16px;
}

.umi-nav-toggle__line {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .2s var(--umi-ease), opacity .2s var(--umi-ease);
}

.umi-nav-toggle[aria-expanded="true"] .umi-nav-toggle__line:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.umi-nav-toggle[aria-expanded="true"] .umi-nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.umi-nav-toggle[aria-expanded="true"] .umi-nav-toggle__line:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.umi-nav-toggle__text {
  font-family: var(--umi-mono);
  font-size: .68rem;
  letter-spacing: .12em;
}

/* 头部行动 */
.umi-header__actions {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 6. 页脚 ---------------------------------------------------------------- */
.umi-footer {
  position: relative;
  isolation: isolate;
  margin-top: clamp(56px, 9vw, 118px);
  background: var(--umi-ink);
  color: #EDE6D8;
  overflow: hidden;
}

.umi-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(247, 241, 227, .06) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(0deg, rgba(247, 241, 227, .05) 0 1px, transparent 1px 84px),
    radial-gradient(92% 80% at 6% 0%, rgba(242, 107, 42, .24), rgba(242, 107, 42, 0) 62%);
}

.umi-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.35fr);
  grid-template-areas:
    "brand cols"
    "contact contact"
    "bottom bottom";
  gap: clamp(28px, 4vw, 54px) clamp(24px, 4vw, 64px);
  padding-top: clamp(38px, 6vw, 76px);
  padding-bottom: clamp(20px, 3vw, 32px);
}

.umi-footer__brand {
  grid-area: brand;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 38ch;
}

.umi-footer__mark {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: inherit;
}

.umi-footer__glyph {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--umi-signal);
  color: var(--umi-ink);
  font-size: .92rem;
  font-weight: 800;
  letter-spacing: -.02em;
  box-shadow: inset 0 0 0 1px rgba(22, 40, 61, .25);
}

.umi-footer__name {
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #F7F1E3;
}

.umi-footer__tagline {
  font-size: clamp(1.02rem, 1.5vw, 1.22rem);
  font-weight: 600;
  line-height: 1.65;
  letter-spacing: -.01em;
  color: #F5EEE1;
}

.umi-footer__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.umi-footer__legend-item {
  padding: .26em .72em;
  border: 1px solid rgba(201, 191, 175, .4);
  border-radius: var(--umi-r-pill);
  font-family: var(--umi-mono);
  font-size: .66rem;
  letter-spacing: .12em;
  color: rgba(237, 230, 216, .78);
}

.umi-footer__cols {
  grid-area: cols;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 32px);
}

.umi-footer__col {
  min-width: 0;
}

.umi-footer__heading {
  margin: 0 0 12px;
  font-family: var(--umi-mono);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(237, 230, 216, .58);
}

.umi-footer__links {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.umi-footer__link {
  display: inline-block;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  color: #EDE6D8;
  font-size: .94rem;
  text-decoration: none;
  transition: color .16s var(--umi-ease), border-color .16s var(--umi-ease);
}

.umi-footer__link:hover {
  color: #FFFFFF;
  border-bottom-color: var(--umi-signal);
}

.umi-footer__contact {
  grid-area: contact;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px clamp(20px, 4vw, 48px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px dashed rgba(201, 191, 175, .45);
}

.umi-footer__contact .umi-footer__heading {
  grid-column: 1 / -1;
  margin: 0;
}

.umi-footer__contact-list {
  grid-column: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
  gap: 12px 26px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.umi-footer__contact-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.umi-footer__label {
  font-family: var(--umi-mono);
  font-size: .64rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(237, 230, 216, .52);
}

.umi-footer__value {
  font-size: .92rem;
  color: #F5EEE1;
  overflow-wrap: anywhere;
}

.umi-footer__contact .umi-btn {
  grid-column: 2;
  justify-self: end;
}

.umi-footer__bottom {
  grid-area: bottom;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px clamp(16px, 3vw, 32px);
  padding-top: clamp(16px, 2.4vw, 26px);
  border-top: 1px solid rgba(201, 191, 175, .24);
  font-family: var(--umi-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: rgba(237, 230, 216, .62);
}

.umi-footer__copy,
.umi-footer__icp {
  margin: 0;
}

.umi-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0 0 0 auto;
  padding: 0;
  list-style: none;
}

.umi-footer__legal-link {
  padding-bottom: 1px;
  border-bottom: 1px solid rgba(201, 191, 175, .4);
  color: rgba(237, 230, 216, .85);
  text-decoration: none;
  transition: color .16s var(--umi-ease), border-color .16s var(--umi-ease);
}

.umi-footer__legal-link:hover {
  color: #FFFFFF;
  border-bottom-color: var(--umi-signal);
}

/* 7. 按钮 ---------------------------------------------------------------- */
.umi-btn {
  --umi-btn-bg: var(--umi-ink);
  --umi-btn-fg: var(--umi-card);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .66em 1.25em;
  border: 1px solid transparent;
  border-radius: var(--umi-r-pill);
  background: var(--umi-btn-bg);
  color: var(--umi-btn-fg);
  font-family: var(--umi-sans);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: transform .16s var(--umi-ease), background-color .16s var(--umi-ease),
              color .16s var(--umi-ease), border-color .16s var(--umi-ease), box-shadow .16s var(--umi-ease);
}

.umi-btn:hover { transform: translateY(-1px); }
.umi-btn:active { transform: translateY(0); }

.umi-btn--signal {
  --umi-btn-bg: var(--umi-signal);
  --umi-btn-fg: var(--umi-ink);
  box-shadow: 0 12px 24px -16px rgba(242, 107, 42, .95);
}

.umi-btn--signal:hover {
  --umi-btn-bg: #FF7C3A;
  box-shadow: 0 16px 28px -14px rgba(242, 107, 42, .9);
}

.umi-btn--ghost {
  --umi-btn-bg: transparent;
  --umi-btn-fg: var(--umi-ink);
  border-color: var(--umi-line);
}

.umi-btn--ghost:hover {
  --umi-btn-bg: rgba(246, 178, 122, .35);
  border-color: var(--umi-amber);
}

/* 8. 排版组件 ------------------------------------------------------------ */
.umi-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  font-family: var(--umi-mono);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--umi-text);
}

.umi-eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--umi-signal);
}

.umi-display {
  font-size: clamp(2.4rem, 5vw, 5.2rem);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: -.03em;
  color: var(--umi-ink);
}

.umi-h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.3rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--umi-ink);
}

.umi-h3 {
  font-size: clamp(1.08rem, 1.6vw, 1.3rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--umi-ink);
}

.umi-lede {
  max-width: 56ch;
  font-size: clamp(1rem, 1.25vw, 1.16rem);
  line-height: 1.8;
  color: var(--umi-text);
}

.umi-mono {
  font-family: var(--umi-mono);
  font-size: .82em;
  letter-spacing: .04em;
}

.umi-prose {
  max-width: var(--umi-narrow);
  color: var(--umi-ink);
}

.umi-prose p + p,
.umi-prose p + ul,
.umi-prose ul + p { margin-top: 1em; }

.umi-prose h2 {
  margin-top: 2.2em;
  margin-bottom: .6em;
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  font-weight: 800;
  letter-spacing: -.02em;
}

.umi-prose h3 {
  margin-top: 1.6em;
  margin-bottom: .4em;
  font-size: 1.06rem;
  font-weight: 700;
}

.umi-prose ul,
.umi-prose ol {
  padding-left: 1.3em;
  color: var(--umi-text);
}

.umi-prose li { margin-top: .35em; }

.umi-prose a {
  color: var(--umi-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--umi-amber);
}

.umi-prose a:hover { border-bottom-color: var(--umi-signal); }

.umi-note {
  padding: .2em 0 .2em 1em;
  border-left: 3px solid var(--umi-amber);
  font-size: .9rem;
  line-height: 1.75;
  color: var(--umi-text);
}

.umi-rule {
  height: 1px;
  margin: 0;
  border: 0;
  background-image: repeating-linear-gradient(90deg, var(--umi-line) 0 8px, transparent 8px 17px);
}

/* 9. 布局与网格 ---------------------------------------------------------- */
.umi-shell {
  width: 100%;
  max-width: var(--umi-max);
  margin-inline: auto;
  padding-inline: var(--umi-gutter);
}

.umi-main {
  display: block;
}

.umi-section {
  position: relative;
  padding-block: clamp(38px, 6vw, 86px);
}

.umi-section--warm { background: var(--umi-warm); }

.umi-section--paper { background: var(--umi-card); }

.umi-section--ink {
  background: var(--umi-ink);
  color: #EDE6D8;
}

.umi-section--ink .umi-h2,
.umi-section--ink .umi-h3 { color: #F7F1E3; }

.umi-section--ink .umi-lede { color: rgba(237, 230, 216, .82); }

.umi-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
}

.umi-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.umi-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.umi-grid--split { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); }

/* 10. 内容组件 ----------------------------------------------------------- */
.umi-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--umi-line);
  border-radius: var(--umi-r-md);
  background: var(--umi-card);
  box-shadow: var(--umi-shadow-card);
}

.umi-card--glass {
  background: rgba(255, 253, 247, .64);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.umi-card__kicker {
  display: block;
  margin-bottom: 10px;
  font-family: var(--umi-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--umi-text);
}

.umi-tag {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .22em .72em;
  border: 1px solid var(--umi-line);
  border-radius: var(--umi-r-pill);
  background: var(--umi-card);
  color: var(--umi-text);
  font-family: var(--umi-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  line-height: 1.6;
  text-transform: uppercase;
}

.umi-tag--old {
  border-color: rgba(110, 143, 166, .65);
  background: rgba(110, 143, 166, .16);
  color: #3A566B;
}

.umi-tag--new {
  border-color: rgba(47, 125, 109, .65);
  background: rgba(47, 125, 109, .16);
  color: #1E574B;
}

.umi-tag--signal {
  border-color: rgba(242, 107, 42, .6);
  background: rgba(242, 107, 42, .16);
  color: #A03F16;
}

.umi-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5em;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--umi-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--umi-text);
}

.umi-breadcrumb a {
  color: var(--umi-text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--umi-ease), border-color .16s var(--umi-ease);
}

.umi-breadcrumb a:hover {
  color: var(--umi-ink);
  border-bottom-color: var(--umi-signal);
}

.umi-breadcrumb__sep {
  color: var(--umi-line);
}

.umi-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--umi-line);
  border-radius: var(--umi-r-md);
  background-color: var(--umi-warm);
  background-image:
    linear-gradient(135deg, rgba(255, 253, 247, .9), rgba(228, 218, 203, .7)),
    repeating-linear-gradient(90deg, rgba(22, 40, 61, .07) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(0deg, rgba(22, 40, 61, .06) 0 1px, transparent 1px 40px);
}

.umi-media > img,
.umi-media > svg,
.umi-media > picture,
.umi-media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.umi-media__label {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-family: var(--umi-mono);
  font-size: .66rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--umi-text);
}

.umi-media__caption {
  margin-top: 10px;
  font-family: var(--umi-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--umi-text);
}

.umi-details {
  border: 1px solid var(--umi-line);
  border-radius: var(--umi-r-md);
  background: var(--umi-card);
  overflow: hidden;
}

.umi-details + .umi-details { margin-top: 10px; }

.umi-details__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 18px;
  font-weight: 700;
  color: var(--umi-ink);
  cursor: pointer;
  list-style: none;
  transition: background-color .16s var(--umi-ease);
}

.umi-details__summary::-webkit-details-marker { display: none; }

.umi-details__summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--umi-mono);
  font-size: 1.05rem;
  color: var(--umi-signal);
}

.umi-details[open] .umi-details__summary::after { content: "–"; }

.umi-details__summary:hover { background: rgba(246, 178, 122, .22); }

.umi-details__body {
  padding: 0 18px 18px;
  color: var(--umi-text);
  font-size: .94rem;
}

/* 11. 动效 --------------------------------------------------------------- */
.umi-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s var(--umi-ease), transform .55s var(--umi-ease);
}

.umi-js [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* 12. 响应式 ------------------------------------------------------------- */
@media (max-width: 1000px) {
  .umi-header__rail { display: none; }

  .umi-nav-toggle { display: inline-flex; order: 3; }

  .umi-brand { margin-right: auto; }

  .umi-header__actions { order: 2; margin-left: 0; }

  .umi-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    display: block;
    max-height: min(72vh, 520px);
    margin: 0;
    padding: 10px;
    overflow: auto;
    border: 1px solid var(--umi-line);
    border-radius: 22px;
    background: rgba(255, 253, 247, .97);
    box-shadow: 0 26px 54px -28px rgba(22, 40, 61, .75);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity .2s var(--umi-ease), transform .2s var(--umi-ease), visibility .2s var(--umi-ease);
  }

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

  .umi-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .umi-nav__link {
    width: 100%;
    padding: 12px 16px;
    border-radius: 14px;
    font-size: .98rem;
  }

  .umi-nav__link[aria-current="page"] { border-radius: 14px; }

  .umi-nav__link[aria-current="page"]::after {
    left: 7px;
    top: 50%;
    bottom: auto;
    width: 2px;
    height: 15px;
    transform: translateY(-50%);
  }
}

@media (max-width: 900px) {
  .umi-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "brand"
      "cols"
      "contact"
      "bottom";
  }

  .umi-footer__brand { max-width: none; }

  .umi-footer__contact {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .umi-footer__contact .umi-footer__heading,
  .umi-footer__contact-list { grid-column: auto; }

  .umi-footer__contact .umi-btn {
    grid-column: auto;
    justify-self: start;
  }

  .umi-footer__legal { margin-left: 0; }

  .umi-grid--2,
  .umi-grid--3,
  .umi-grid--split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  .umi-header { padding-inline: 10px; }

  .umi-header__bar {
    gap: 8px;
    padding: 7px 8px;
    border-radius: 20px;
  }

  .umi-header__actions .umi-btn--ghost { display: none; }

  .umi-brand__helper { display: none; }

  .umi-brand__mark {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    font-size: .84rem;
  }

  .umi-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .umi-footer__contact-list { grid-template-columns: minmax(0, 1fr); }
}

@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;
  }

  .umi-js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}