/* ==========================================================================
   聚合入口 · 共享样式 /assets/site.css
   骨架：技术蓝图网格 + 玻璃工具层 + 实色内容层
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
[hidden] { display: none !important; }

/* ---------- 2. Tokens ---------- */
:root {
  --navy-900: #0B2239;
  --navy-700: #14395C;
  --navy-500: #1F6091;
  --cyan: #17C3C9;
  --orange: #FF7A2F;
  --paper: #F4F1EA;
  --gray: #E7EBF1;
  --ink: #0E1116;
  --slate: #6B7A8C;
  --line: #C9D2DE;
  --white: #FFFFFF;
  --mist: #D7F1F2;

  --radius: 14px;
  --radius-sm: 8px;
  --container: 1240px;
  --gutter: 24px;
  --header-h: 72px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-narrow: "PingFang SC", "Helvetica Neue", "Arial Narrow", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: Georgia, "Songti SC", "Source Han Serif SC", "Noto Serif SC", serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, "Courier New", monospace;

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

/* ---------- 3. 中文排版底 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--ink);
  background-color: var(--gray);
  background-image:
    linear-gradient(to right, rgba(31, 96, 145, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 96, 145, .07) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: center top;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-narrow);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.18;
  color: inherit;
}
h1 { font-size: clamp(34px, 5vw, 64px); }
h2 { font-size: clamp(24px, 3.4vw, 34px); }
h3 { font-size: clamp(18px, 2vw, 24px); }
h4 { font-size: 18px; }
.editorial { font-family: var(--font-serif); font-weight: 500; letter-spacing: 0; }

p { text-wrap: pretty; }
a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

:focus-visible {
  outline: 2px solid var(--navy-500);
  outline-offset: 2px;
  border-radius: 4px;
}
.site-header :focus-visible,
.site-footer :focus-visible { outline-color: var(--orange); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -72px; left: 16px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 0 0 10px 10px;
  background: var(--paper);
  color: var(--navy-900);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 0; }

/* ---------- 4. 布局容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 96px); position: relative; }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }
.section--paper { background: var(--paper); color: var(--ink); }
.section--navy { background: var(--navy-900); color: var(--paper); }
.section--navy .lede { color: rgba(244, 241, 234, .72); }
.section--navy a { color: var(--mist); }

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--7-3 { grid-template-columns: minmax(0, 7fr) minmax(0, 3fr); }

/* ---------- 5. 文本部件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--navy-500);
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: currentColor;
}
.section--navy .eyebrow { color: var(--cyan); }

.lede {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.7;
  color: var(--slate);
  max-width: 64ch;
}

.prose { max-width: 68ch; font-size: 17px; line-height: 1.75; }
.prose > * + * { margin-top: 1.1em; }
.prose h2, .prose h3 { margin-top: 1.6em; }

.num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--navy-500);
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 1px;
}

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.1;
  color: var(--navy-900);
  border-bottom: 2px solid var(--cyan);
  align-self: flex-start;
  padding-bottom: 4px;
}
.stat__label { font-size: 13px; letter-spacing: .08em; color: var(--slate); }
.section--navy .stat__value { color: var(--paper); }
.section--navy .stat__label { color: rgba(244, 241, 234, .6); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-narrow);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  text-decoration: none;
  cursor: pointer;
  transition: transform .18s var(--ease), background .2s, color .2s, border-color .2s;
}
.btn--primary { background: var(--orange); color: var(--navy-900); }
.btn--primary:hover { background: #FF9257; transform: translateY(-2px); }
.btn--ghost {
  background: transparent;
  border-color: rgba(215, 241, 242, .42);
  color: var(--paper);
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--white); transform: translateY(-2px); }
.btn--line {
  background: transparent;
  border-color: var(--navy-500);
  color: var(--navy-500);
}
.btn--line:hover { background: var(--navy-500); color: var(--white); transform: translateY(-2px); }
.btn__arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  transition: transform .2s var(--ease);
}
.btn:hover .btn__arrow { transform: translateX(3px); }

/* ---------- 7. 卡片 / 标签 / 索引 ---------- */
.card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 2.2vw, 26px);
}
.card--paper { background: var(--paper); border-color: #DCD5C6; }
.card--glass {
  background: rgba(255, 255, 255, .12);
  border-color: rgba(255, 255, 255, .26);
  color: var(--paper);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.card--lift { transition: transform .24s var(--ease), border-color .24s var(--ease); }
.card--lift:hover { transform: translateY(-4px); border-color: var(--navy-500); }
.card__head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.card__title { font-family: var(--font-narrow); font-size: 20px; font-weight: 700; letter-spacing: -.02em; }
.card__body { font-size: 15px; color: var(--slate); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--white);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--navy-500);
}
.tag--cyan { background: var(--mist); border-color: rgba(23, 195, 201, .45); color: #0E6B70; }
.tag--orange { background: #FFF1E8; border-color: rgba(255, 122, 47, .45); color: #B34A11; }

.index-list { border-top: 1px solid var(--line); }
.index-list__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 14px 4px;
  border-bottom: 1px solid var(--line);
  transition: background .2s;
}
.index-list__item:hover { background: rgba(23, 195, 201, .07); }

.rule {
  height: 10px;
  opacity: .5;
  background:
    linear-gradient(var(--navy-500), var(--navy-500)) 0 0 / 100% 1px no-repeat,
    repeating-linear-gradient(90deg, var(--slate) 0 1px, transparent 1px 32px) 0 1px / 100% 6px no-repeat;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 14px 0;
  font-size: 13px;
  color: var(--slate);
}
.breadcrumb__item { display: flex; align-items: center; gap: 8px; }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: var(--line); }
.breadcrumb a { color: var(--navy-500); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* ---------- 8. 折叠组 ---------- */
.fold {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  overflow: hidden;
}
.fold + .fold { margin-top: 10px; }
.fold__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-narrow);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -.01em;
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--navy-500);
}
.fold[open] .fold__summary::after { content: "–"; color: var(--orange); }
.fold__body { padding: 0 18px 18px; font-size: 16px; color: var(--slate); }
.fold[open] .fold__body { animation: foldIn .24s var(--ease); }
@keyframes foldIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 9. 图片容器基础 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--navy-700);
}
.media > img,
.media > svg,
.media__img { display: block; width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 16 / 9; }
.media--photo { aspect-ratio: 4 / 3; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 3 / 4; }
.media--diagonal::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, transparent 55%, rgba(23, 195, 201, .32) 55%, rgba(23, 195, 201, .32) 66%, transparent 66%);
}
.media__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 12px 14px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--paper);
  background: linear-gradient(to top, rgba(11, 34, 57, .88), rgba(11, 34, 57, 0));
}
.media__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: rgba(244, 241, 234, .55);
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, .06) 0 12px, transparent 12px 24px),
    var(--navy-700);
}

/* ==========================================================================
   10. 页头
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  isolation: isolate;
  background: var(--navy-900);
  color: var(--paper);
  border-bottom: 1px solid rgba(23, 195, 201, .28);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(105deg, transparent 62%, rgba(23, 195, 201, .16) 62%, rgba(23, 195, 201, .16) 72%, transparent 72%),
    linear-gradient(105deg, transparent 74%, rgba(255, 122, 47, .22) 74%, rgba(255, 122, 47, .22) 80%, transparent 80%);
}
.site-header[data-scrolled] { box-shadow: 0 10px 26px rgba(11, 34, 57, .22); }

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  overflow: hidden;
  background: rgba(255, 255, 255, .09);
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  width: 100%; height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.header-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-h);
}

/* 品牌 */
.brand__link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
.brand__mark {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 3px;
  width: 34px; height: 34px;
  padding: 7px;
  border: 1px solid rgba(215, 241, 242, .45);
  border-radius: 10px;
  background: rgba(255, 255, 255, .06);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.brand__mark i { display: block; background: var(--mist); border-radius: 1px; }
.brand__mark i:nth-child(2) { background: var(--cyan); }
.brand__mark i:nth-child(4) { background: var(--orange); }
.brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand__name {
  font-family: var(--font-narrow);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--white);
}
.brand__slogan {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(244, 241, 234, .62);
}

/* 导航 */
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.site-nav__link {
  position: relative;
  display: block;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 15px;
  letter-spacing: .02em;
  color: rgba(244, 241, 234, .82);
  text-decoration: none;
  transition: color .2s, background .2s;
}
.site-nav__link:hover { color: var(--white); background: rgba(255, 255, 255, .08); }
.site-nav__link[aria-current="page"] {
  color: var(--white);
  background: rgba(23, 195, 201, .18);
}
.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 4px;
  height: 2px;
  background: var(--cyan);
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid rgba(215, 241, 242, .35);
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  color: var(--paper);
  font-size: 14px;
  cursor: pointer;
}
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform .24s var(--ease), opacity .24s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle__label { letter-spacing: .06em; }

.nav-scrim { display: none; }

/* 工具带 */
.tool-band {
  position: relative;
  z-index: 2;
  border-top: 1px solid rgba(215, 241, 242, .14);
  background: linear-gradient(180deg, rgba(255, 255, 255, .06), rgba(255, 255, 255, .02));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.tool-band__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 60px;
  padding-block: 10px;
}
.tool-band__note {
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(244, 241, 234, .55);
  white-space: nowrap;
}
.tool-band__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 18px;
}
.tool-link {
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--mist);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(215, 241, 242, .35);
  transition: color .2s, border-color .2s;
}
.tool-link:hover { color: var(--white); border-color: var(--cyan); }

/* 站内检索 */
.quickfind {
  position: relative;
  flex: 1 1 auto;
  max-width: 520px;
}
.quickfind__field {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border: 1px solid rgba(215, 241, 242, .3);
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  transition: border-color .2s, box-shadow .2s;
}
.quickfind__field::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: -1px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .3s var(--ease);
}
.quickfind.is-hitting .quickfind__field {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(23, 195, 201, .16);
}
.quickfind.is-hitting .quickfind__field::after { transform: scaleX(1); }
.quickfind__icon {
  flex: 0 0 auto;
  width: 13px; height: 13px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  position: relative;
}
.quickfind__icon::after {
  content: "";
  position: absolute;
  right: -5px; bottom: -4px;
  width: 6px; height: 2px;
  background: var(--cyan);
  transform: rotate(45deg);
}
.quickfind__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--white);
  font-size: 15px;
  letter-spacing: .02em;
}
.quickfind__input::placeholder { color: rgba(244, 241, 234, .5); }
.quickfind__input:focus { outline: none; }
.quickfind__count {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cyan);
  white-space: nowrap;
}
.quickfind__panel {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  z-index: 5;
  width: min(92vw, 460px);
  padding: 8px;
  border: 1px solid rgba(31, 96, 145, .25);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .95);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  color: var(--ink);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
}
.quickfind[data-open] .quickfind__panel {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.quickfind__item[hidden] { display: none; }
.quickfind__link {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--ink);
  transition: background .18s, color .18s;
}
.quickfind__link:hover { background: var(--mist); }
.quickfind__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--navy-500);
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 1px;
  justify-self: start;
}
.quickfind__label { font-size: 15px; font-weight: 600; letter-spacing: -.01em; }
.quickfind__hint { font-size: 12px; color: var(--slate); letter-spacing: .06em; }
.quickfind__empty {
  padding: 14px 12px;
  font-size: 14px;
  color: var(--slate);
}

/* ==========================================================================
   11. 页脚
   ========================================================================== */
.site-footer {
  position: relative;
  background: var(--navy-900);
  color: rgba(244, 241, 234, .78);
  border-top: 1px solid rgba(23, 195, 201, .3);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0 22%, var(--orange) 22% 30%, rgba(255, 255, 255, .08) 30% 100%);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1fr 1.3fr;
  gap: clamp(20px, 3vw, 40px);
  padding-block: clamp(40px, 5vw, 72px);
}
.footer__name {
  font-family: var(--font-narrow);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--white);
}
.footer__slogan {
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}
.footer__blurb {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 234, .62);
  max-width: 32ch;
}
.footer__badge {
  display: inline-block;
  margin-top: 16px;
  padding: 5px 12px;
  border: 1px solid rgba(23, 195, 201, .4);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}
.footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: rgba(244, 241, 234, .5);
}
.footer__list li + li { margin-top: 10px; }
.footer__list a {
  font-size: 15px;
  color: rgba(244, 241, 234, .82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.footer__list a:hover { color: var(--white); border-color: var(--cyan); }
.footer__feedback {
  display: inline-block;
  margin-top: 18px;
  padding: 8px 14px;
  border: 1px dashed rgba(23, 195, 201, .5);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
  text-decoration: none;
  transition: background .2s, color .2s;
}
.footer__feedback:hover { background: rgba(23, 195, 201, .14); color: var(--white); }

.footer__qr {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-content: flex-start;
}
.qr-tile { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.qr-tile__code {
  position: relative;
  width: 76px; height: 76px;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: var(--radius-sm);
  background-color: var(--white);
  background-image:
    linear-gradient(45deg, var(--navy-900) 25%, transparent 25%, transparent 75%, var(--navy-900) 75%),
    linear-gradient(45deg, var(--navy-900) 25%, transparent 25%, transparent 75%, var(--navy-900) 75%);
  background-size: 12px 12px;
  background-position: 0 0, 6px 6px;
  opacity: .92;
}
.qr-tile__code::before,
.qr-tile__code::after {
  content: "";
  position: absolute;
  width: 18px; height: 18px;
  background: var(--white);
}
.qr-tile__code::before {
  top: 5px; left: 5px;
  border: 4px solid var(--orange);
  border-radius: 3px;
}
.qr-tile__code::after {
  right: 5px; bottom: 5px;
  border: 4px solid var(--cyan);
  border-radius: 3px;
}
.qr-tile__label {
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(244, 241, 234, .7);
}
.footer__qr-note {
  flex: 1 1 100%;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(244, 241, 234, .5);
}

.footer__meta {
  background: var(--paper);
  color: var(--ink);
  padding-block: 18px;
}
.footer__meta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}
.footer__contact {
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}
.footer__legal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--navy-700);
}

/* ==========================================================================
   12. 响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .tool-band__note { display: none; }
  .footer__grid { grid-template-columns: 1.6fr 1fr 1fr; }
  .footer__qr { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  :root { --header-h: 64px; }
  body { padding-bottom: 84px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 80;
    width: min(84vw, 340px);
    padding: 92px 18px 32px;
    overflow-y: auto;
    background: var(--navy-900);
    background-image:
      linear-gradient(to right, rgba(23, 195, 201, .12) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(23, 195, 201, .12) 1px, transparent 1px);
    background-size: 44px 44px;
    border-right: 1px solid rgba(23, 195, 201, .3);
    transform: translateX(-102%);
    transition: transform .28s var(--ease);
  }
  .site-nav[data-open] { transform: translateX(0); }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .site-nav__link {
    padding: 14px 12px;
    border-radius: 10px;
    border-bottom: 1px solid rgba(215, 241, 242, .1);
    font-size: 17px;
  }
  .site-nav__link[aria-current="page"]::after { display: none; }
  .site-nav__link[aria-current="page"] { border-left: 3px solid var(--cyan); }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 70;
    background: rgba(11, 34, 57, .62);
    opacity: 0;
    visibility: hidden;
    transition: opacity .28s var(--ease), visibility .28s;
  }
  .nav-scrim[data-open] { opacity: 1; visibility: visible; }

  .tool-band {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 75;
    border-top: 1px solid rgba(23, 195, 201, .3);
    border-bottom: 0;
    background: rgba(11, 34, 57, .97);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .tool-band__inner { gap: 10px; padding-inline: 12px; min-height: 56px; }
  .tool-band__actions { gap: 10px; }
  .tool-link { display: none; }
  .btn { padding: 10px 16px; font-size: 14px; }
  .quickfind { max-width: none; }
  .quickfind__input { font-size: 14px; }
  .quickfind__count { display: none; }
  .quickfind__panel {
    top: auto;
    bottom: calc(100% + 10px);
    width: min(94vw, 460px);
  }

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

@media (max-width: 720px) {
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__brand { grid-column: 1 / -1; }
  .footer__qr { grid-column: 1 / -1; }
  .footer__meta-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  :root { --gutter: 16px; }
  body { font-size: 15px; }
  .brand__slogan { display: none; }
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .btn__label { font-size: 14px; }
}

/* ---------- 13. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .card--lift:hover,
  .btn--primary:hover,
  .btn--ghost:hover,
  .btn--line:hover { transform: none; }
}