:root {
  --primary: #ff6b9d;
  --primary-dark: #e0558a;
  --primary-light: #ffd6e5;
  --secondary: #7ec8e3;
  --secondary-dark: #5ba8c4;
  --accent: #b39ddb;
  --bg: #fdf7fa;
  --bg-alt: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.65);
  --bg-glass-border: rgba(255, 255, 255, 0.75);
  --text: #2d2a32;
  --text-soft: #5c5666;
  --text-muted: #8a8494;
  --border: #f0e4ea;
  --shadow-sm: 0 2px 8px rgba(255, 107, 157, 0.08);
  --shadow-md: 0 8px 24px rgba(255, 107, 157, 0.12);
  --shadow-lg: 0 16px 48px rgba(255, 107, 157, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient-hero: linear-gradient(135deg, #ffe3ee 0%, #e3f4ff 50%, #f0e6ff 100%);
  --gradient-primary: linear-gradient(135deg, #ff6b9d 0%, #b39ddb 100%);
  --gradient-soft: linear-gradient(135deg, #fff5f9 0%, #f0f7ff 100%);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

[data-theme="dark"] {
  --primary: #ff8fb5;
  --primary-dark: #ff6b9d;
  --primary-light: #3d2430;
  --secondary: #8fd4ec;
  --secondary-dark: #7ec8e3;
  --accent: #c9b8e8;
  --bg: #16131a;
  --bg-alt: #1f1b26;
  --bg-glass: rgba(31, 27, 38, 0.65);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --text: #f0ecf4;
  --text-soft: #c4bcd0;
  --text-muted: #8a8494;
  --border: #2e2836;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --gradient-hero: linear-gradient(135deg, #2a1f2e 0%, #1a2530 50%, #221a2e 100%);
  --gradient-primary: linear-gradient(135deg, #ff8fb5 0%, #c9b8e8 100%);
  --gradient-soft: linear-gradient(135deg, #1f1b26 0%, #1a2028 100%);
}

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

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--primary-dark);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover,
a:focus-visible {
  color: var(--primary);
  text-decoration: underline;
}

ul,
ol {
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.4em;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  margin-bottom: 0.85em;
  position: relative;
  padding-bottom: 0.5em;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  margin: 1.4em 0 0.6em;
  color: var(--text);
}

p {
  margin-bottom: 1em;
  color: var(--text-soft);
}

strong {
  color: var(--text);
}

time {
  font-size: 0.85em;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.2em;
  background: var(--gradient-soft);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-soft);
}

blockquote p {
  margin-bottom: 0;
}

/* ============ 滚动动画 ============ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes floatSoft {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 107, 157, 0.35); }
  50% { box-shadow: 0 0 0 12px rgba(255, 107, 157, 0); }
}

@supports (animation-timeline: view()) {
  main > section {
    animation: fadeInUp 0.6s ease-out both;
    animation-timeline: view();
    animation-range: entry 0% entry 60%;
  }
}

@supports not (animation-timeline: view()) {
  main > section {
    animation: fadeInUp 0.7s ease-out both;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ 顶部品牌栏 ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  padding: 0.75rem clamp(1rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "brand nav actions"
    "brand search actions";
  align-items: center;
  gap: 0.5rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition), border-color var(--transition);
}

.brand-bar {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--text);
}

.brand-logo svg {
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(255, 107, 157, 0.3);
  transition: transform var(--transition);
}

.brand-logo:hover svg {
  transform: rotate(-8deg) scale(1.06);
}

.brand-logo:hover {
  text-decoration: none;
}

.brand-name {
  font-size: 1.2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand-slogan {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
  white-space: nowrap;
}

/* ============ 主导航 ============ */
#main-nav {
  grid-area: nav;
}

#main-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

#main-nav li {
  margin: 0;
}

#main-nav a {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-full);
  transition: background-color var(--transition), color var(--transition), transform var(--transition);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  background: var(--primary-light);
  color: var(--primary-dark);
  text-decoration: none;
  transform: translateY(-2px);
}

/* ============ 搜索表单 ============ */
#site-search {
  grid-area: search;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.35rem 0.25rem 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.15);
}

#site-search label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

#search-input {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  padding: 0.35rem 0;
  outline: none;
}

#search-input::placeholder {
  color: var(--text-muted);
}

#site-search button {
  flex-shrink: 0;
  border: none;
  background: var(--gradient-primary);
  color: #fff;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

#site-search button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255, 107, 157, 0.35);
  filter: brightness(1.05);
}

#site-search button:active {
  transform: translateY(0);
}

/* ============ 操作按钮区 ============ */
#theme-toggle,
#menu-toggle {
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text-soft);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

#theme-toggle {
  grid-area: actions;
  justify-self: end;
}

#theme-toggle:hover,
#menu-toggle:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  background: var(--primary-light);
  transform: translateY(-1px);
}

#menu-toggle {
  display: none;
  grid-area: actions;
  justify-self: end;
}

#menu-toggle[aria-expanded="true"] {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
}

/* ============ 面包屑 ============ */
#breadcrumb {
  padding: 0.75rem clamp(1rem, 4vw, 2.5rem);
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

#breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

#breadcrumb li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

#breadcrumb li + li::before {
  content: "/";
  color: var(--text-muted);
  opacity: 0.6;
}

#breadcrumb a {
  color: var(--text-soft);
}

#breadcrumb a:hover {
  color: var(--primary-dark);
}

#breadcrumb [aria-current="page"] {
  color: var(--primary-dark);
  font-weight: 600;
}

/* ============ 主内容区 ============ */
#main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2rem) clamp(1rem, 4vw, 2.5rem) 3rem;
}

main > section {
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

main > section > * {
  max-width: 100%;
}

/* ============ Hero / 轮播 ============ */
#hero {
  background: var(--gradient-hero);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 4vw, 3rem);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: background var(--transition);
}

#hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 157, 0.25), transparent 70%);
  pointer-events: none;
  animation: floatSoft 8s ease-in-out infinite;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -8%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(126, 200, 227, 0.25), transparent 70%);
  pointer-events: none;
  animation: floatSoft 10s ease-in-out infinite reverse;
}

.banner-carousel {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--primary) transparent;
  position: relative;
  z-index: 1;
}

.banner-carousel::-webkit-scrollbar {
  height: 6px;
}

.banner-carousel::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: var(--radius-full);
}

.banner-carousel::-webkit-scrollbar-track {
  background: transparent;
}

.slide {
  flex: 0 0 100%;
  scroll-snap-align: center;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.slide:hover {
  transform: scale(1.01);
  box-shadow: var(--shadow-md);
}

.slide svg {
  width: 100%;
  height: auto;
  display: block;
}

#hero-title {
  position: relative;
  z-index: 1;
  margin-bottom: 1rem;
  color: var(--text);
}

.hero-intro {
  position: relative;
  z-index: 1;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  color: var(--text-soft);
  margin-bottom: 0;
  max-width: 900px;
}

/* ============ 通用卡片区块 ============ */
#about,
#products,
#solutions,
#cases,
#news,
#articles,
#knowledge,
#faq,
#howto,
#contact,
#sitemap,
#links {
  background: var(--bg-glass);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 2.25rem);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), background-color var(--transition), transform var(--transition);
}

#about:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#articles:hover,
#knowledge:hover,
#faq:hover,
#howto:hover,
#contact:hover,
#sitemap:hover,
#links:hover {
  box-shadow: var(--shadow-md);
}

/* ============ EEAT 信息 ============ */
.eeat-info,
.contact-info {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.5rem 1.25rem;
  margin: 1.25rem 0 0;
  padding: 1.25rem;
  background: var(--gradient-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.eeat-info dt,
.contact-info dt {
  font-weight: 700;
  color: var(--primary-dark);
  font-size: 0.9rem;
}

.eeat-info dd,
.contact-info dd {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.9rem;
  word-break: break-word;
}

/* ============ 新闻列表 ============ */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.news-list li {
  padding: 0.85rem 1rem 0.85rem 2.4rem;
  margin-bottom: 0.6rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  position: relative;
  font-size: 0.92rem;
  color: var(--text-soft);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.news-list li::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.news-list li:hover {
  transform: translateX(4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.news-list time {
  display: inline-block;
  margin-right: 0.5rem;
  font-weight: 600;
  color: var(--primary-dark);
}

/* ============ 文章卡片 ============ */
#articles article {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-primary);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

#articles article:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

#articles article:hover::before {
  transform: scaleY(1);
}

#articles article h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: 1.08rem;
}

#articles article h3 a {
  color: var(--text);
  text-decoration: none;
}

#articles article h3 a:hover {
  color: var(--primary-dark);
  text-decoration: none;
}

#articles article p {
  font-size: 0.92rem;
  margin-bottom: 0.6rem;
}

#articles article p time {
  font-weight: 600;
  color: var(--primary-dark);
}

#articles article > a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary-dark);
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  transition: all var(--transition);
}

#articles article > a::after {
  content: "→";
  transition: transform var(--transition);
}

#articles article > a:hover {
  background: var(--gradient-primary);
  color: #fff;
  text-decoration: none;
}

#articles article > a:hover::after {
  transform: translateX(3px);
}

/* ============ FAQ 折叠面板 ============ */
#faq details {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  padding: 0;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

#faq details[open] {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

#faq summary {
  cursor: pointer;
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  list-style: none;
  position: relative;
  padding-right: 3rem;
  transition: background-color var(--transition), color var(--transition);
  border-radius: var(--radius-md);
}

#faq summary::-webkit-details-marker {
  display: none;
}

#faq summary::after {
  content: "+";
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary);
  line-height: 1;
  transition: transform var(--transition), color var(--transition);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

#faq summary:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}

#faq details > p {
  padding: 0 1.25rem 1.1rem;
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-soft);
  animation: fadeIn 0.3s ease-out;
}

/* ============ HowTo 教程 ============ */
#howto ol,
#howto ul {
  margin-bottom: 1.2rem;
}

#howto ol {
  counter-reset: howto-step;
  list-style: none;
  padding-left: 0;
}

#howto ol > li {
  counter-increment: howto-step;
  position: relative;
  padding: 0.7rem 1rem 0.7rem 3rem;
  margin-bottom: 0.6rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--text-soft);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#howto ol > li::before {
  content: counter(howto-step);
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.7rem;
  height: 1.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(255, 107, 157, 0.3);
}

#howto ol > li:hover {
  transform: translateX(4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

#howto ul li {
  font-size: 0.92rem;
  color: var(--text-soft);
  padding: 0.3rem 0;
}

#howto ul li::marker {
  color: var(--primary);
}

/* ============ 站点地图 & 友情链接 ============ */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.6rem;
}

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: block;
  padding: 0.55rem 0.9rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-soft);
  text-align: center;
  transition: all var(--transition);
}

#sitemap a:hover,
#links a:hover {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(255, 107, 157, 0.3);
}

/* ============ 页脚 ============ */
#site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1rem, 4vw, 2.5rem) 1.5rem;
  margin-top: 2rem;
  transition: background-color var(--transition), border-color var(--transition);
}

#site-footer section {
  max-width: 1200px;
  margin: 0 auto 1.5rem;
}

#site-footer h2 {
  font-size: 1.05rem;
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
}

#site-footer h2::after {
  width: 36px;
  height: 3px;
}

#site-footer p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

.footer-meta {
  max-width: 1200px;
  margin: 1.5rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ============ 返回顶部 ============ */
#back-to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 90;
  border: none;
  background: var(--gradient-primary);
  color: #fff;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  animation: pulseGlow 3s ease-in-out infinite;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

#back-to-top:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 2px;
}

/* ============ 响应式：平板 ============ */
@media (max-width: 1024px) {
  #site-header {
    grid-template-columns: auto 1fr auto;
    grid-template-areas:
      "brand actions actions"
      "nav nav nav"
      "search search search";
    gap: 0.6rem;
  }

  #main-nav ul {
    justify-content: center;
  }

  #theme-toggle {
    justify-self: end;
  }

  #site-search {
    max-width: 100%;
  }

  .brand-slogan {
    display: none;
  }
}

/* ============ 响应式：手机 ============ */
@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  #site-header {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand menu"
      "search search";
    padding: 0.6rem 1rem;
    gap: 0.5rem;
  }

  #theme-toggle {
    display: none;
  }

  #menu-toggle {
    display: inline-block;
  }

  #main-nav {
    grid-column: 1 / -1;
    grid-area: auto;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, opacity 0.3s ease;
    opacity: 0;
    width: 100%;
  }

  #main-nav.is-open {
    max-height: 600px;
    opacity: 1;
    margin-top: 0.25rem;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 0.15rem;
  }

  #main-nav a {
    display: block;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    text-align: left;
  }

  #site-search {
    grid-area: search;
  }

  .brand-name {
    font-size: 1.05rem;
  }

  #breadcrumb {
    padding: 0.6rem 1rem;
  }

  #main-content {
    padding: 1rem 1rem 2rem;
  }

  #hero {
    padding: 1.25rem;
    border-radius: var(--radius-md);
  }

  .banner-carousel {
    gap: 0.75rem;
  }

  .slide svg {
    min-height: 160px;
  }

  .eeat-info,
  .contact-info {
    grid-template-columns: 1fr;
    gap: 0.25rem 0;
    padding: 1rem;
  }

  .eeat-info dt,
  .contact-info dt {
    margin-top: 0.5rem;
  }

  .eeat-info dt:first-child,
  .contact-info dt:first-child {
    margin-top: 0;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(2, 1fr);
  }

  #back-to-top {
    font-size: 0.8rem;
    padding: 0.55rem 0.9rem;
  }

  #articles article {
    padding: 1rem;
  }
}

/* ============ 响应式：小屏 ============ */
@media (max-width: 480px) {
  #site-header {
    padding: 0.5rem 0.75rem;
  }

  #main-content {
    padding: 0.75rem 0.75rem 1.5rem;
  }

  #hero {
    padding: 1rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }

  .news-list li {
    padding-left: 2rem;
    font-size: 0.88rem;
  }

  #howto ol > li {
    padding-left: 2.6rem;
    font-size: 0.88rem;
  }

  #faq summary {
    padding: 0.85rem 1rem;
    padding-right: 2.5rem;
    font-size: 0.9rem;
  }
}

/* ============ 焦点可见性 ============ */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 3px solid var(--secondary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============ 选中文本 ============ */
::selection {
  background: var(--primary);
  color: #fff;
}

/* ============ 滚动条 ============ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* ============ 打印样式 ============ */
@media print {
  #site-header,
  #breadcrumb,
  #back-to-top,
  #site-search,
  #theme-toggle,
  #menu-toggle,
  #main-nav {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  main > section {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
    background: #fff;
    backdrop-filter: none;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #555;
  }
}