/* ========== 1. CSS 变量 ========== */
:root {
  --blue-plateau: #1A4A7A;
  --snow-white: #F5F7FA;
  --cream: #FBF7EF;
  --brown-dark: #2B2318;
  --red-prayer: #D84A3A;
  --yellow-prayer: #E3A829;
  --green-prayer: #2E8B6D;
  --blue-lake: #5A9BD4;
  --gray-mist: #8A8A8A;
  --pure-white: #FFFFFF;

  --font-heading: "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Source Han Serif SC", "Noto Serif CJK SC", "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-note: "SF Mono", "Cascadia Code", "Roboto Mono", Consolas, "Liberation Mono", monospace;

  --content-max: 1280px;
  --content-pad: clamp(20px, 3vw, 40px);
  --header-navbar-h: 54px;
  --radius: 4px;
  --cut-size: 18px;
  --transition: 240ms cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-soft: 0 4px 24px rgba(26, 74, 122, 0.08);
  --shadow-lifted: 0 12px 40px rgba(26, 74, 122, 0.16);
}

/* ========== 2. Reset ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--brown-dark);
  background: var(--snow-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

#main-content {
  flex: 1 0 auto;
  scroll-margin-top: calc(var(--header-navbar-h) + 8px);
  outline: none;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button,
input,
optgroup,
select,
textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}

button {
  cursor: pointer;
}

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

::selection {
  background: rgba(90, 155, 212, 0.3);
}

/* ========== 3. 通用排版 ========== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.25;
  color: var(--blue-plateau);
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(32px, 6vw, 60px);
  letter-spacing: 0.01em;
}

h2 {
  font-size: clamp(26px, 4vw, 38px);
  margin-bottom: 16px;
}

h3 {
  font-size: clamp(20px, 2.6vw, 26px);
  margin-bottom: 12px;
}

p {
  margin-bottom: 1rem;
}

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

em {
  font-style: italic;
}

small {
  font-size: 13px;
}

/* 眉题 */
.eyebrow {
  display: inline-block;
  font-family: var(--font-note);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red-prayer);
  margin-bottom: 10px;
  border-left: 3px solid var(--yellow-prayer);
  padding-left: 10px;
}

/* 数据胶囊 */
.data-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  padding: 6px 16px;
  border-radius: 24px;
  background: rgba(26, 74, 122, 0.09);
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 900;
  color: var(--blue-plateau);
  line-height: 1.2;
}

.data-chip small {
  font-size: 12px;
  font-weight: 500;
  color: var(--gray-mist);
  letter-spacing: 0.05em;
}

.data-chip--red {
  background: rgba(216, 74, 58, 0.1);
  color: var(--red-prayer);
}

/* 切角面板 */
.panel-cut {
  --cut: var(--cut-size);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  background: var(--pure-white);
  padding: 32px;
  box-shadow: var(--shadow-soft);
}

.panel-cut--cream {
  background: var(--cream);
}

.panel-cut--blue {
  background: var(--blue-plateau);
  color: rgba(255, 255, 255, 0.9);
}

/* 数据流虚线分隔 */
.flow-line {
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--blue-lake) 0 10px, transparent 10px 18px);
  border: none;
  margin: 32px 0;
}

/* 响应式图片容器 */
.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, var(--blue-lake), var(--blue-plateau));
  aspect-ratio: 16 / 10;
  border-radius: var(--radius);
}

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

.media-frame--portrait {
  aspect-ratio: 4 / 5;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

.media-frame--cream {
  background: var(--cream);
}

/* ========== 4. 容器与辅助 ========== */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

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

/* ========== 5. Skip Link ========== */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 1100;
  background: var(--red-prayer);
  color: var(--pure-white);
  padding: 12px 24px;
  border-radius: 0 0 6px 6px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  transition: top 240ms ease;
  box-shadow: 0 4px 16px rgba(216, 74, 58, 0.3);
}

.skip-link:focus {
  top: 0;
}

/* ========== 6. 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--radius);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.4;
  white-space: nowrap;
  text-align: center;
  transition: background var(--transition), color var(--transition), transform 160ms ease, box-shadow var(--transition), border-color var(--transition);
}

.btn--primary {
  background: var(--red-prayer);
  color: var(--pure-white);
  box-shadow: 0 6px 20px rgba(216, 74, 58, 0.3);
}

.btn--primary:hover {
  background: #BD3A2C;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(216, 74, 58, 0.35);
}

.btn--secondary {
  background: transparent;
  color: var(--blue-plateau);
  border: 2px solid rgba(26, 74, 122, 0.6);
}

.btn--secondary:hover {
  background: var(--blue-plateau);
  border-color: var(--blue-plateau);
  color: var(--pure-white);
  transform: translateY(-2px);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.1);
  color: var(--pure-white);
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.6);
}

/* ========== 7. 面包屑 ========== */
.breadcrumb {
  margin-bottom: 28px;
  font-size: 14px;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb-list li {
  display: inline-flex;
  align-items: center;
}

.breadcrumb-list li + li::before {
  content: "›";
  color: var(--gray-mist);
  margin-right: 6px;
  font-size: 16px;
}

.breadcrumb-list a {
  color: var(--blue-lake);
  transition: color var(--transition);
}

.breadcrumb-list a:hover {
  color: var(--blue-plateau);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.breadcrumb-list [aria-current="page"] {
  color: var(--gray-mist);
  font-weight: 600;
}

/* ========== 8. 头部 ========== */
.site-header {
  position: relative;
  z-index: 100;
  background: var(--cream);
  border-bottom: 1px solid rgba(26, 74, 122, 0.12);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--red-prayer) 0 70%, var(--yellow-prayer) 70% 100%);
  z-index: 1200;
  pointer-events: none;
  transition: width 120ms linear;
}

.header-ribbon {
  display: flex;
  height: 6px;
}

.ribbon-cell {
  flex: 1;
}

.ribbon-blue {
  background: var(--blue-plateau);
}

.ribbon-red {
  background: var(--red-prayer);
}

.ribbon-yellow {
  background: var(--yellow-prayer);
}

.ribbon-green {
  background: var(--green-prayer);
}

.ribbon-lake {
  background: var(--blue-lake);
}

.header-masthead {
  border-bottom: 1px solid rgba(26, 74, 122, 0.06);
}

.header-masthead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 84px;
}

/* 品牌 */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.brand-icon {
  display: inline-flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  width: 46px;
  height: 46px;
  padding: 9px 7px;
  background: linear-gradient(145deg, var(--blue-plateau) 0%, #22588E 100%);
  border-radius: 6px 6px 6px 16px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18), 0 4px 12px rgba(26, 74, 122, 0.35);
  position: relative;
  flex-shrink: 0;
}

.brand-ic-bar {
  display: block;
  width: 3px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.65);
  transition: height 300ms ease;
}

.brand-ic-bar-s {
  height: 12px;
}

.brand-ic-bar-m {
  height: 22px;
  background: var(--pure-white);
}

.brand-ic-bar-l {
  height: 16px;
}

.brand-icon::after {
  content: "";
  position: absolute;
  top: -3px;
  right: -3px;
  width: 11px;
  height: 11px;
  background: var(--red-prayer);
  border-radius: 50%;
  border: 2px solid var(--cream);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 24px;
  color: var(--blue-plateau);
  letter-spacing: 0.04em;
}

.brand-tagline {
  font-family: var(--font-note);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--gray-mist);
  margin-top: 2px;
  white-space: nowrap;
}

/* 头部工具 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.search-wrap {
  position: relative;
}

.search-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--blue-plateau);
  transition: background var(--transition), color var(--transition);
}

.search-toggle:hover {
  background: rgba(26, 74, 122, 0.1);
  color: var(--blue-plateau);
}

.search-icon {
  position: relative;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-radius: 50%;
  display: block;
}

.search-icon::after {
  content: "";
  position: absolute;
  bottom: -4px;
  right: -5px;
  width: 7px;
  height: 2px;
  background: currentColor;
  transform: rotate(45deg);
  border-radius: 2px;
}

.search-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: min(300px, 74vw);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--pure-white);
  border: 1px solid rgba(26, 74, 122, 0.12);
  border-radius: 6px;
  box-shadow: var(--shadow-lifted);
  z-index: 220;
}

.search-panel[hidden] {
  display: none;
}

.search-input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  font-size: 15px;
  color: var(--brown-dark);
  background: transparent;
  padding: 4px 0;
}

.search-input::placeholder {
  color: var(--gray-mist);
  opacity: 0.75;
}

.search-hint {
  font-family: var(--font-note);
  font-size: 13px;
  color: var(--gray-mist);
  padding: 2px 6px;
  border: 1px solid rgba(138, 138, 138, 0.3);
  border-radius: 4px;
  line-height: 1.2;
}

/* 简繁切换 */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 7px 12px;
  border-radius: 20px;
  border: 1px solid rgba(26, 74, 122, 0.2);
  background: var(--snow-white);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--blue-plateau);
  transition: border-color var(--transition), background var(--transition);
}

.lang-switch:hover {
  border-color: var(--blue-lake);
  background: var(--pure-white);
}

.lang-sel:first-child {
  color: var(--red-prayer);
}

.lang-sel:last-child {
  color: var(--gray-mist);
}

.lang-switch[aria-pressed="true"] .lang-sel:first-child {
  color: var(--gray-mist);
}

.lang-switch[aria-pressed="true"] .lang-sel:last-child {
  color: var(--red-prayer);
}

.lang-div {
  color: var(--gray-mist);
  font-weight: 400;
  font-size: 11px;
}

/* 移动汉堡 */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid rgba(26, 74, 122, 0.18);
  background: var(--snow-white);
  transition: background var(--transition), border-color var(--transition);
}

.mobile-nav-toggle:hover {
  background: var(--pure-white);
  border-color: var(--blue-lake);
}

.toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--blue-plateau);
  border-radius: 2px;
  transition: transform 260ms ease, opacity 200ms ease;
}

.mobile-nav-toggle[aria-expanded="true"] .toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.mobile-nav-toggle[aria-expanded="true"] .toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 导航栏 */
.header-navbar {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--snow-white);
  border-bottom: 1px solid rgba(26, 74, 122, 0.08);
}

.header-navbar .container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--header-navbar-h);
}

.site-nav {
  width: 100%;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.nav-item {
  margin: 0 4px;
}

.nav-link {
  position: relative;
  display: block;
  padding: 10px 18px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--brown-dark);
  border-radius: 3px;
  transition: color var(--transition), background var(--transition);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 2px;
  height: 3px;
  background: var(--red-prayer);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition);
}

.nav-link:hover {
  color: var(--blue-plateau);
  background: rgba(26, 74, 122, 0.05);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--blue-plateau);
  font-weight: 800;
}

/* ========== 9. 页脚 ========== */
.site-footer {
  position: relative;
  background-color: var(--blue-plateau);
  background-image:
    linear-gradient(45deg, rgba(255, 255, 255, 0.035) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.035) 75%),
    linear-gradient(45deg, rgba(255, 255, 255, 0.035) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.035) 75%);
  background-size: 28px 28px;
  background-position: 0 0, 14px 14px;
  color: rgba(255, 255, 255, 0.85);
  flex-shrink: 0;
}

.footer-pattern {
  height: 6px;
  background: repeating-linear-gradient(90deg,
      var(--red-prayer) 0 48px,
      var(--yellow-prayer) 48px 96px,
      var(--green-prayer) 96px 144px,
      var(--blue-lake) 144px 192px);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.3fr);
  gap: 48px;
  padding-top: 56px;
  padding-bottom: 48px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 900;
  color: var(--pure-white);
  letter-spacing: 0.06em;
  line-height: 1.2;
  position: relative;
  padding-bottom: 6px;
}

.footer-brand::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  background: var(--yellow-prayer);
  border-radius: 2px;
}

.footer-trust {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.72);
  margin-top: 18px;
  max-width: 34em;
}

.footer-contact-brief {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 20px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  font-family: var(--font-note);
  line-height: 1.5;
}

.footer-col-title {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--yellow-prayer);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 15px;
  transition: color var(--transition), transform var(--transition), text-decoration-color var(--transition);
  display: inline-block;
  text-underline-offset: 4px;
}

.footer-list a:hover {
  color: var(--pure-white);
  transform: translateX(3px);
  text-decoration: underline;
  text-decoration-color: var(--red-prayer);
  text-decoration-thickness: 2px;
}

.footer-list li {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.55;
}

.footer-lab {
  color: var(--blue-lake);
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(8, 26, 48, 0.35);
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  flex-wrap: wrap;
  padding-block: 18px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
}

.footer-copyright {
  margin: 0;
}

.footer-entry-link {
  color: var(--blue-lake);
  font-weight: 700;
  padding: 4px 14px;
  border: 1px solid rgba(90, 155, 212, 0.4);
  border-radius: 20px;
  font-size: 12.5px;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.footer-entry-link:hover {
  background: var(--blue-lake);
  border-color: var(--blue-lake);
  color: var(--pure-white);
}

.footer-icp {
  margin: 0;
  font-family: var(--font-note);
  letter-spacing: 0.04em;
}

/* 返回顶部 */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 28px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--blue-plateau);
  color: var(--pure-white);
  font-size: 18px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 28px rgba(26, 74, 122, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background var(--transition);
  z-index: 300;
}

.back-top:hover {
  background: var(--red-prayer);
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ========== 10. 响应式 ========== */
@media (max-width: 1024px) {
  .footer-top {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .header-masthead-inner {
    min-height: 68px;
  }

  .brand-icon {
    width: 40px;
    height: 40px;
    padding: 8px 6px;
  }

  .brand-name {
    font-size: 20px;
  }

  .brand-tagline {
    font-size: 9px;
    letter-spacing: 0.08em;
  }

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

  .header-navbar .container {
    min-height: 0;
    padding: 0;
    display: block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    background: var(--cream);
    border-bottom: 1px solid rgba(26, 74, 122, 0.1);
    box-shadow: 0 16px 32px rgba(26, 74, 122, 0.14);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    width: 100%;
    transition: max-height 360ms cubic-bezier(0.4, 0, 0.2, 1),
      opacity 240ms ease,
      visibility 0s 360ms;
  }

  .site-nav[data-open="true"] {
    max-height: 480px;
    visibility: visible;
    opacity: 1;
    transition: max-height 360ms cubic-bezier(0.4, 0, 0.2, 1),
      opacity 240ms ease,
      visibility 0s;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
  }

  .nav-item {
    margin: 0;
  }

  .nav-link {
    padding: 14px 24px;
    border-bottom: 1px solid rgba(26, 74, 122, 0.06);
    border-radius: 0;
    font-size: 16px;
  }

  .nav-link::after {
    left: 24px;
    right: auto;
    width: 36px;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
    padding-top: 44px;
    padding-bottom: 36px;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
  }

  .footer-bottom-row {
    padding-block: 16px;
    justify-content: center;
    text-align: center;
  }

  .search-panel {
    width: min(300px, 74vw);
  }

  .back-top {
    right: 16px;
    bottom: 20px;
    width: 42px;
    height: 42px;
    font-size: 16px;
  }
}

@media (max-width: 560px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .footer-brand-col {
    grid-column: auto;
  }

  .lang-switch {
    padding: 5px 9px;
    font-size: 12px;
  }

  .search-toggle {
    width: 36px;
    height: 36px;
  }

  .footer-bottom-row {
    flex-direction: column;
    gap: 8px;
  }
}

/* ========== 11. 无障碍 / 动效偏好 ========== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .site-nav {
    transition: max-height 0.01ms ease, opacity 0.01ms ease, visibility 0s;
  }

  .scroll-progress {
    transition: none;
  }
}