/* ============================================
   华体官网入口 · zhibo-huati.com.cn
   共享样式 /assets/site.css
   主题：深空导航 + 展览标签
   ============================================ */

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

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

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

input,
button,
textarea,
select {
  font: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

ul[class],
ol[class] {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
}

/* ---------- 设计变量 ---------- */
:root {
  /* 色彩 */
  --c-space: #0B1A3A;
  --c-navy: #16337A;
  --c-info: #2E5CB8;
  --c-accent: #FF6A00;
  --c-accent-soft: #FFD9C0;
  --c-silver: #E5E9F0;
  --c-slate: #4A5568;
  --c-ink: #1A202C;
  --c-white: #FFFFFF;
  --c-success: #2ECC71;

  /* 字体 */
  --font-head: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: Georgia, 'Times New Roman', 'Songti SC', serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  /* 布局 */
  --container: 1280px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --gap-section: clamp(4rem, 10vw, 7.5rem);
  --gap-card: clamp(1.25rem, 3vw, 2rem);
  --radius: 12px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.3s;
}

/* ---------- 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(229, 233, 240, 0.86);
  background-color: var(--c-space);
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(229, 233, 240, 0.045) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  top: -22%;
  right: -12%;
  width: 55vw;
  height: 55vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 92, 184, 0.13), transparent 65%);
  pointer-events: none;
  z-index: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  color: var(--c-white);
  line-height: 1.25;
  font-weight: 800;
  margin-bottom: 0.6em;
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: rgba(229, 233, 240, 0.85);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

a:hover {
  color: var(--c-accent);
}

ul,
ol {
  margin: 0 0 1em 1.5em;
}

blockquote {
  margin: 2rem 0;
  padding: 1rem 1.5rem;
  border-left: 3px solid var(--c-accent);
  background: rgba(22, 51, 122, 0.4);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: rgba(229, 233, 240, 0.85);
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: rgba(229, 233, 240, 0.12);
  padding: 0.18em 0.45em;
  border-radius: 4px;
  color: var(--c-accent-soft);
}

pre {
  margin: 1.5rem 0;
  padding: 1rem;
  background: rgba(5, 13, 32, 0.6);
  border: 1px solid rgba(229, 233, 240, 0.1);
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

::selection {
  background: var(--c-accent);
  color: var(--c-white);
}

:focus-visible {
  outline: 2px dashed var(--c-white);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content {
  position: relative;
  z-index: 1;
  outline: none;
  scroll-margin-top: 72px;
}

/* ---------- 通用容器与网格 ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gap-card);
}

.col-span-4 { grid-column: span 4; }
.col-span-6 { grid-column: span 6; }
.col-span-8 { grid-column: span 8; }
.col-span-12 { grid-column: span 12; }

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  padding: 0.65rem 1.25rem;
  background: var(--c-accent);
  color: var(--c-white);
  font-family: var(--font-head);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 0 0 8px 0;
  transform: translateY(-120%);
  transition: transform 0.25s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 26, 58, 0.88);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(229, 233, 240, 0.1);
}

.header-shell {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0.85rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.scrollprogress {
  position: absolute;
  bottom: -1px;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--c-accent), #FF944D);
  box-shadow: 0 0 10px rgba(255, 106, 0, 0.5);
  border-radius: 0 2px 2px 0;
  transition: width 0.1s linear;
  z-index: 10;
}

/* 品牌 */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  flex-shrink: 0;
}

.brand-lockup:hover .brand-seal {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 106, 0, 0.4);
}

.brand-seal {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--c-accent), #FF944D);
  color: var(--c-white);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.3rem;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(255, 106, 0, 0.3);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

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

.brand-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--c-white);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: rgba(229, 233, 240, 0.55);
  text-transform: uppercase;
  white-space: nowrap;
}

/* 导航 */
.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.nav-item {
  list-style: none;
}

.nav-link {
  display: inline-block;
  padding: 0.55rem 0.9rem;
  font-family: var(--font-head);
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(229, 233, 240, 0.8);
  border-radius: 6px;
  position: relative;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--c-white);
  background: rgba(255, 106, 0, 0.12);
  transform: translateY(-2px);
}

.nav-link[aria-current="page"] {
  color: var(--c-accent);
  font-weight: 600;
}

.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: 0.1rem;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
}

/* 移动导航按钮（桌面隐藏） */
.nav-trigger {
  display: none;
}

.nav-trigger-box {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 14px;
  flex-shrink: 0;
}

.nav-trigger-line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease), top 0.25s var(--ease);
}

.nav-trigger-line:nth-child(1) { top: 0; }
.nav-trigger-line:nth-child(2) { top: 6px; }
.nav-trigger-line:nth-child(3) { top: 12px; }

.nav-trigger-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: var(--gap-section);
  background: rgba(5, 13, 32, 0.75);
  border-top: 1px solid rgba(229, 233, 240, 0.08);
}

.footer-rule {
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent) 0, var(--c-accent) 96px, rgba(229, 233, 240, 0.12) 96px, transparent 100%);
}

.footer-shell {
  max-width: var(--container);
  margin: 0 auto;
  padding: 3.5rem var(--gutter) 1.75rem;
}

.footer-cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.6rem;
}

.footer-brandtext {
  display: flex;
  flex-direction: column;
}

.footer-brand .brand-seal {
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
  border-radius: 8px;
}

.footer-brand .brand-name {
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.footer-brand .brand-tagline {
  color: rgba(229, 233, 240, 0.4);
}

.footer-note {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: rgba(229, 233, 240, 0.45);
  max-width: 42ch;
  margin-top: 0.4rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.9rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(229, 233, 240, 0.12);
}

.footer-link {
  display: inline-block;
  color: rgba(229, 233, 240, 0.7);
  padding: 0.32rem 0;
  font-family: var(--font-head);
  font-size: 0.875rem;
  width: fit-content;
}

.footer-link:hover {
  color: var(--c-accent);
  transform: translateX(3px);
}

.footer-link {
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-line {
  color: rgba(229, 233, 240, 0.7);
  font-size: 0.875rem;
  font-family: var(--font-head);
  line-height: 1.6;
}

.footer-subline {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(229, 233, 240, 0.1);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(229, 233, 240, 0.5);
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 999;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(229, 233, 240, 0.25);
  background: rgba(22, 51, 122, 0.92);
  color: var(--c-silver);
  font-size: 1.25rem;
  line-height: 1;
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.back-top:hover {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
  transform: translateY(-3px);
}

.back-top-icon {
  display: inline-block;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  padding: 0.85em 1.9em;
  border-radius: 8px;
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn:hover {
  transform: translateY(-3px);
}

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

.btn-primary {
  background: var(--c-accent);
  color: var(--c-white);
  box-shadow: 0 4px 16px rgba(255, 106, 0, 0.28);
}

.btn-primary:hover {
  background: #E55E00;
  color: var(--c-white);
  box-shadow: 0 10px 28px rgba(255, 106, 0, 0.35);
}

.btn-ghost {
  background: transparent;
  border-color: rgba(229, 233, 240, 0.35);
  color: rgba(229, 233, 240, 0.85);
}

.btn-ghost:hover {
  border-color: var(--c-silver);
  background: rgba(229, 233, 240, 0.08);
  color: var(--c-white);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: rgba(229, 233, 240, 0.5);
  margin-bottom: 2rem;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '/';
  margin-right: 0.75rem;
  color: rgba(229, 233, 240, 0.2);
}

.breadcrumb-item a {
  color: rgba(229, 233, 240, 0.7);
}

.breadcrumb-item a:hover {
  color: var(--c-accent);
}

.breadcrumb-item[aria-current="page"] {
  color: var(--c-accent);
}

/* ---------- 章节 ---------- */
.section {
  padding-top: var(--gap-section);
  padding-bottom: var(--gap-section);
}

.section-head {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.section-index {
  font-family: var(--font-mono);
  font-size: clamp(2.75rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px rgba(229, 233, 240, 0.28);
  white-space: nowrap;
}

.section-title {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  margin-top: 0.25rem;
}

.section-desc {
  color: rgba(229, 233, 240, 0.72);
  max-width: 56ch;
  font-size: 1.0625rem;
}

/* ---------- 页面标题 ---------- */
.page-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-desc {
  font-size: 1.125rem;
  color: rgba(229, 233, 240, 0.72);
  max-width: 62ch;
}

/* ---------- 文本工具 ---------- */
.note {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: rgba(229, 233, 240, 0.55);
  letter-spacing: 0.02em;
  line-height: 1.6;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(229, 233, 240, 0.45);
}

.divider {
  height: 1px;
  background: rgba(229, 233, 240, 0.14);
  border: none;
  margin: 2rem 0;
}

/* ---------- 标签胶囊 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.25em 0.75em;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  border: 1px solid rgba(229, 233, 240, 0.2);
  color: rgba(229, 233, 240, 0.8);
  background: rgba(229, 233, 240, 0.06);
}

.chip-accent {
  border-color: rgba(255, 106, 0, 0.5);
  color: var(--c-accent);
  background: rgba(255, 106, 0, 0.1);
}

/* ---------- 卡片（展览标签隐喻） ---------- */
.exhibit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: var(--gap-card);
}

.exhibit-grid-staggered {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gap-card);
}

.exhibit-grid-staggered .exhibit-card:nth-child(3n+1) { grid-column: 1 / span 5; }
.exhibit-grid-staggered .exhibit-card:nth-child(3n+2) { grid-column: 7 / span 6; margin-top: 2.5rem; }
.exhibit-grid-staggered .exhibit-card:nth-child(3n+3) { grid-column: 2 / span 5; margin-top: -1.5rem; }

.exhibit-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  background: linear-gradient(160deg, rgba(22, 51, 122, 0.9), rgba(11, 26, 58, 0.96));
  border: 1px solid rgba(229, 233, 240, 0.1);
  border-radius: var(--radius);
  list-style: none;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.exhibit-card:hover {
  transform: translateY(-4px);
  border-color: rgba(229, 233, 240, 0.22);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.28);
}

.exhibit-card.is-active {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 1px var(--c-accent), 0 18px 36px rgba(0, 0, 0, 0.3);
}

.exhibit-ref {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--c-accent);
  text-transform: uppercase;
}

.exhibit-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0;
}

.exhibit-desc {
  font-size: 0.9375rem;
  color: rgba(229, 233, 240, 0.7);
  flex: 1;
}

.exhibit-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(229, 233, 240, 0.1);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(229, 233, 240, 0.5);
}

/* ---------- 图片容器 ---------- */
.figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(46, 92, 184, 0.2), rgba(22, 51, 122, 0.45));
  aspect-ratio: 3 / 4;
}

.figure-compact {
  aspect-ratio: 4 / 3;
}

.figure-wide {
  aspect-ratio: 16 / 9;
}

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

.figure-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 2.5rem 1rem 0.75rem;
  background: linear-gradient(to top, rgba(5, 13, 32, 0.9), transparent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(229, 233, 240, 0.8);
}

/* ---------- 浅色区块 ---------- */
.t-light {
  background: var(--c-silver);
  color: var(--c-ink);
  padding-top: var(--gap-section);
  padding-bottom: var(--gap-section);
}

.t-light h1,
.t-light h2,
.t-light h3,
.t-light h4 {
  color: var(--c-ink);
}

.t-light a {
  color: var(--c-info);
}

.t-light .exhibit-card {
  background: var(--c-white);
  border-color: rgba(26, 32, 44, 0.08);
}

.t-light .exhibit-title { color: var(--c-ink); }
.t-light .exhibit-desc { color: rgba(26, 32, 44, 0.7); }
.t-light .section-desc { color: rgba(26, 32, 44, 0.65); }
.t-light .section-index { -webkit-text-stroke: 1px rgba(26, 32, 44, 0.3); }

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 平板响应 ---------- */
@media (max-width: 991px) {
  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .col-span-4,
  .col-span-8 {
    grid-column: span 12;
  }

  .col-span-6 {
    grid-column: span 6;
  }

  .exhibit-grid-staggered .exhibit-card:nth-child(n) {
    grid-column: span 12;
    margin-top: 0;
  }
}

/* ---------- 移动响应 ---------- */
@media (max-width: 767px) {
  .nav-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.5rem 0.85rem;
    border: 1px solid rgba(229, 233, 240, 0.22);
    border-radius: 8px;
    background: rgba(229, 233, 240, 0.06);
    color: var(--c-silver);
    font-family: var(--font-head);
    font-size: 0.8125rem;
    transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  }

  .nav-trigger[aria-expanded="true"] {
    border-color: var(--c-accent);
    background: rgba(255, 106, 0, 0.12);
    color: var(--c-accent);
  }

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

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

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

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    background: rgba(5, 13, 32, 0.98);
    border-bottom: 1px solid rgba(229, 233, 240, 0.15);
    padding: 1rem var(--gutter) 1.5rem;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .nav-link {
    display: block;
    padding: 0.8rem 0.6rem;
    font-size: 1rem;
    border-radius: 8px;
  }

  .nav-link[aria-current="page"] {
    background: rgba(255, 106, 0, 0.1);
  }

  .nav-link[aria-current="page"]::after {
    display: none;
  }

  .footer-cols {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .col-span-4,
  .col-span-6,
  .col-span-8 {
    grid-column: span 12;
  }

  .brand-name {
    font-size: 1rem;
  }

  .brand-seal {
    width: 38px;
    height: 38px;
    font-size: 1.15rem;
    border-radius: 8px;
  }

  .back-top {
    right: 1rem;
    bottom: 1rem;
    width: 40px;
    height: 40px;
  }
}

/* ---------- 动效减弱 ---------- */
@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;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}