/* ============================================================
   U米中心 · 共享样式 /assets/site.css
   米白暖砂打底，电光蓝与荧光橙加速，深墨绿压舱
   ============================================================ */

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

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

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

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

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

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

a { color: inherit; text-decoration-thickness: 1px; }

/* ---------- 变量 ---------- */
:root {
  --umi-cream: #F7F1E6;
  --umi-sand: #E7D5B8;
  --umi-blue: #0B4BFF;
  --umi-orange: #FF6A1A;
  --umi-green: #0B3B32;
  --umi-indigo: #352A67;
  --umi-wine: #7A1D35;
  --umi-ink: #141414;
  --umi-steel: #9FB1C4;
  --umi-panel: #DCE6FF;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: var(--font-display);
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --wrap: 1180px;
  --gap: clamp(16px, 2.4vw, 30px);
  --radius: 2px;
  --shadow: 6px 6px 0 var(--umi-ink);
  --shadow-sm: 3px 3px 0 var(--umi-ink);
  --ease: cubic-bezier(.2, .7, .3, 1);
  --header-h: 0px;
}

/* ---------- 中文排版与基础 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: .01em;
  color: var(--umi-ink);
  background-color: var(--umi-cream);
  background-image:
    repeating-linear-gradient(90deg, rgba(20, 20, 20, .035) 0 1px, transparent 1px 96px);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.01em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

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

::selection {
  background: var(--umi-blue);
  color: #fff;
}

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

.u-rule {
  height: 2px;
  border: 0;
  background: var(--umi-ink);
  margin-block: clamp(24px, 3vw, 40px);
}

/* ---------- 分区 ---------- */
.u-section {
  padding-block: clamp(40px, 6vw, 84px);
  border-top: 3px solid var(--umi-ink);
}

.u-section--sand { background-color: var(--umi-sand); }
.u-section--panel { background-color: var(--umi-panel); }

.u-section--green,
.u-section--indigo,
.u-section--wine {
  color: var(--umi-cream);
  border-top-color: var(--umi-ink);
}

.u-section--green { background-color: var(--umi-green); }
.u-section--indigo { background-color: var(--umi-indigo); }
.u-section--wine { background-color: var(--umi-wine); }

.u-section--green .u-lead,
.u-section--indigo .u-lead,
.u-section--wine .u-lead { color: rgba(247, 241, 230, .86); }

/* ---------- 标题与文本 ---------- */
.u-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--umi-blue);
  margin-bottom: 14px;
}

.u-eyebrow::before {
  content: "";
  width: 24px;
  height: 3px;
  background: var(--umi-orange);
  flex: 0 0 auto;
}

.u-h1 {
  font-size: clamp(36px, 6vw, 68px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -.02em;
  margin-bottom: .38em;
}

.u-h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  margin-bottom: .5em;
}

.u-h3 {
  font-size: clamp(19px, 2.1vw, 24px);
  margin-bottom: .5em;
}

.u-lead {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.75;
  max-width: 34em;
  color: #2B2B2B;
}

.u-prose {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
}

.u-prose > * + * { margin-top: 1.05em; }
.u-prose h2 { font-size: clamp(22px, 2.4vw, 28px); margin-top: 1.6em; }
.u-prose h3 { font-size: clamp(18px, 2vw, 21px); margin-top: 1.4em; }
.u-prose ul, .u-prose ol { padding-left: 1.4em; }
.u-prose ul { list-style: square; }
.u-prose ol { list-style: decimal; }
.u-prose li + li { margin-top: .45em; }
.u-prose a {
  color: var(--umi-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.u-prose code {
  font-family: var(--font-mono);
  font-size: .92em;
  background: var(--umi-panel);
  border: 1px solid var(--umi-steel);
  padding: 1px 5px;
}

.u-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(48px, 9vw, 116px);
  line-height: .9;
  letter-spacing: -.045em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 标签 ---------- */
.u-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 2px solid var(--umi-ink);
  background: var(--umi-cream);
  color: var(--umi-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1.6;
  white-space: nowrap;
}

.u-tag--blue { background: var(--umi-blue); color: #fff; }
.u-tag--orange { background: var(--umi-orange); color: var(--umi-ink); }

/* ---------- 按钮 ---------- */
.u-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 3px solid var(--umi-ink);
  border-radius: var(--radius);
  background: var(--umi-cream);
  color: var(--umi-ink);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform .14s var(--ease), box-shadow .14s var(--ease),
              background-color .14s var(--ease), color .14s var(--ease);
}

.u-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--umi-ink);
}

.u-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--umi-ink);
}

.u-btn--primary { background: var(--umi-blue); color: #fff; }
.u-btn--primary:hover { background: #0A3EDB; }

.u-btn--accent { background: var(--umi-orange); color: var(--umi-ink); }

.u-btn--ghost { background: transparent; box-shadow: none; }
.u-btn--ghost:hover { background: var(--umi-sand); box-shadow: var(--shadow-sm); }

.u-btn--sm {
  padding: 8px 14px;
  font-size: 13px;
  border-width: 2px;
  box-shadow: 2px 2px 0 var(--umi-ink);
}

/* ---------- 面包屑 ---------- */
.u-breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding-block: 14px;
  border-bottom: 2px solid var(--umi-steel);
}

.u-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.u-breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--umi-steel);
}

.u-breadcrumb a {
  text-decoration: none;
  border-bottom: 1px solid var(--umi-steel);
  padding-bottom: 1px;
}

.u-breadcrumb a:hover {
  color: var(--umi-blue);
  border-color: var(--umi-blue);
}

.u-breadcrumb [aria-current="page"] { color: var(--umi-wine); }

/* ---------- 网格 ---------- */
.u-grid {
  display: grid;
  gap: var(--gap);
}

.u-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.u-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.u-grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

/* ---------- 图片容器基础 ---------- */
.u-media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 3px solid var(--umi-ink);
  background-color: var(--umi-panel);
  background-image:
    repeating-linear-gradient(135deg, rgba(11, 75, 255, .16) 0 10px, transparent 10px 22px);
  aspect-ratio: 16 / 10;
}

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

.u-media--wide { aspect-ratio: 21 / 9; }
.u-media--square { aspect-ratio: 1 / 1; }
.u-media--tall { aspect-ratio: 4 / 5; }

.u-media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 5px 10px;
  background: var(--umi-ink);
  color: var(--umi-cream);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
}

/* ---------- 跳转链接 ---------- */
.u-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 10px 16px;
  background: var(--umi-orange);
  color: var(--umi-ink);
  border: 3px solid var(--umi-ink);
  font-weight: 700;
  text-decoration: none;
}

.u-skip:focus,
.u-skip:focus-visible {
  left: 12px;
  top: 12px;
}

/* ============================================================
   页头
   ============================================================ */
.u-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--umi-cream);
  border-bottom: 3px solid var(--umi-ink);
}

.u-header__strip {
  background: var(--umi-ink);
  color: var(--umi-cream);
}

.u-header__strip-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 7px clamp(16px, 4vw, 40px);
}

.u-header__ver {
  display: inline-block;
  padding: 1px 8px;
  background: var(--umi-orange);
  color: var(--umi-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.7;
}

.u-header__note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(247, 241, 230, .66);
}

.u-header__entry {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--umi-cream);
  text-decoration: none;
  border-bottom: 2px solid var(--umi-orange);
  padding-bottom: 1px;
  white-space: nowrap;
  transition: color .14s var(--ease);
}

.u-header__entry:hover { color: var(--umi-orange); }

.u-header__frame {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px clamp(12px, 2vw, 26px);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(10px, 1.4vw, 15px) clamp(16px, 4vw, 40px);
}

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

.u-brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--umi-blue);
  color: #fff;
  border: 3px solid var(--umi-ink);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  transform: rotate(-3deg);
  transition: transform .16s var(--ease), background-color .16s var(--ease);
}

.u-brand:hover .u-brand__mark {
  transform: rotate(3deg);
  background: var(--umi-orange);
  color: var(--umi-ink);
}

.u-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.12;
}

.u-brand__name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: .01em;
}

.u-brand__line {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--umi-green);
}

/* 移动菜单按钮 */
.u-navtoggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 13px;
  background: var(--umi-cream);
  color: var(--umi-ink);
  border: 3px solid var(--umi-ink);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background-color .14s var(--ease), transform .14s var(--ease);
}

.u-navtoggle:hover { background: var(--umi-sand); }
.u-navtoggle:active { transform: translate(1px, 1px); }

.u-navtoggle__bars {
  width: 16px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}

.u-navtoggle__label { line-height: 1; }

/* 主导航 */
.u-nav {
  display: flex;
  margin-left: auto;
}

.u-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 3px;
}

.u-nav__item { display: block; }

.u-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  color: var(--umi-ink);
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .14s var(--ease), color .14s var(--ease),
              border-color .14s var(--ease), transform .14s var(--ease);
}

.u-nav__link:hover {
  background: var(--umi-sand);
  border-color: var(--umi-ink);
}

.u-nav__link[aria-current="page"] {
  background: var(--umi-ink);
  border-color: var(--umi-ink);
  color: var(--umi-cream);
  font-weight: 700;
}

.u-nav__link--pill {
  background: var(--umi-blue);
  border-color: var(--umi-ink);
  color: #fff;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  letter-spacing: .02em;
}

.u-nav__link--pill:hover {
  background: var(--umi-orange);
  color: var(--umi-ink);
  transform: translate(-1px, -1px);
}

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

/* 滚动读数条 */
.u-header__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 3px;
  background: linear-gradient(90deg, var(--umi-blue) 0%, var(--umi-orange) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ============================================================
   页脚
   ============================================================ */
.u-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--umi-green);
  color: var(--umi-cream);
  border-top: 4px solid var(--umi-ink);
}

.u-footer__inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(34px, 5vw, 62px) clamp(16px, 4vw, 40px) clamp(20px, 3vw, 30px);
}

.u-footer__top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 14px clamp(16px, 3vw, 36px);
  padding-bottom: clamp(20px, 3vw, 32px);
  border-bottom: 2px solid rgba(247, 241, 230, .28);
}

.u-footer__brand {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.01em;
}

.u-footer__line {
  flex: 1 1 260px;
  margin: 0;
  max-width: 26em;
  color: var(--umi-sand);
  font-size: 15px;
  line-height: 1.75;
}

.u-footer__readout {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--umi-orange);
}

.u-footer__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--umi-cream);
}

.u-footer__grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(24px, 3.4vw, 44px);
}

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

.u-footer__label {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--umi-orange);
}

.u-footer__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 15px;
}

.u-footer__links a {
  display: inline-block;
  color: var(--umi-cream);
  text-decoration: none;
  border-bottom: 2px solid rgba(247, 241, 230, .26);
  padding-bottom: 1px;
  transition: border-color .14s var(--ease), color .14s var(--ease);
}

.u-footer__links a:hover {
  border-color: var(--umi-orange);
  color: #fff;
}

.u-footer__links--plain { gap: 10px; }

.u-footer__address {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--umi-sand);
  max-width: 24em;
}

.u-footer__note {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(247, 241, 230, .64);
  max-width: 24em;
}

.u-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: clamp(14px, 2vw, 20px);
  border-top: 2px solid rgba(247, 241, 230, .28);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(247, 241, 230, .72);
}

.u-footer__meta { white-space: nowrap; }

/* 复制按钮 */
.u-copy {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: transparent;
  border: 2px solid rgba(247, 241, 230, .42);
  color: var(--umi-cream);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .03em;
  cursor: pointer;
  text-align: left;
  transition: border-color .14s var(--ease), background-color .14s var(--ease), color .14s var(--ease);
}

.u-copy:hover {
  border-color: var(--umi-orange);
  background: rgba(255, 106, 26, .12);
  color: #fff;
}

.u-copy__hint {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--umi-orange);
}

.u-copy[data-copied] {
  border-color: var(--umi-orange);
  background: var(--umi-orange);
  color: var(--umi-ink);
}

.u-copy[data-copied] .u-copy__hint { color: var(--umi-ink); }

.u-copy[data-copied] .u-copy__hint::before { content: "已复制 "; }

/* 返回顶部 */
.u-top {
  position: fixed;
  right: clamp(12px, 3vw, 28px);
  bottom: clamp(12px, 3vw, 28px);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--umi-cream);
  color: var(--umi-ink);
  border: 3px solid var(--umi-ink);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .16s var(--ease), transform .16s var(--ease),
              visibility .16s var(--ease), background-color .16s var(--ease);
}

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

.u-top:hover { background: var(--umi-orange); }

.u-top__icon {
  font-size: 14px;
  line-height: 1;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1040px) {
  .u-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .u-footer__grid { grid-template-columns: 1fr 1fr; }
  .u-footer__col:first-child { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .u-navtoggle { display: inline-flex; }
  .u-brand { margin-right: auto; }

  .u-nav {
    display: none;
    order: 3;
    flex: 1 0 100%;
    margin-left: 0;
  }

  .u-nav[data-open] {
    display: block;
    margin-top: 6px;
    padding-top: 10px;
    border-top: 3px solid var(--umi-ink);
    animation: uNavIn .16s var(--ease) both;
  }

  .u-nav[data-open] .u-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .u-nav[data-open] .u-nav__item { display: block; }

  .u-nav[data-open] .u-nav__link {
    display: flex;
    width: 100%;
    justify-content: space-between;
    padding: 12px 14px;
    border-color: var(--umi-steel);
    font-size: 15px;
  }

  .u-nav[data-open] .u-nav__link:hover {
    border-color: var(--umi-ink);
    background: var(--umi-sand);
  }

  .u-nav[data-open] .u-nav__link[aria-current="page"] {
    background: var(--umi-ink);
    color: var(--umi-cream);
    border-color: var(--umi-ink);
  }

  .u-nav[data-open] .u-nav__link--pill {
    background: var(--umi-blue);
    color: #fff;
    border-color: var(--umi-ink);
  }

  .u-grid--2,
  .u-grid--split { grid-template-columns: 1fr; }
}

@keyframes uNavIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .u-grid--3 { grid-template-columns: 1fr; }
  .u-header__note { display: none; }
  .u-header__entry { font-size: 11px; letter-spacing: .06em; }
  .u-brand__line { display: none; }
  .u-brand__mark { width: 36px; height: 36px; font-size: 16px; }
  .u-footer__grid { grid-template-columns: 1fr; }
  .u-footer__readout { width: 100%; }
  .u-footer__base { flex-direction: column; align-items: flex-start; gap: 6px; }
  .u-top { font-size: 11px; padding: 9px 12px; }
}

@media (max-width: 420px) {
  .u-navtoggle { padding: 7px 10px; font-size: 12px; }
  .u-header__strip-inner { gap: 6px 10px; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }

  .u-btn:hover,
  .u-nav__link--pill:hover {
    transform: none;
  }

  .u-top { transform: none; }
}