/* ===== 全局重置与变量 ===== */
:root {
  /* 主色调 - 深海蓝 */
  --primary: #0a1628;
  --primary-light: #1a2a4a;
  --primary-dark: #050e1a;
  /* 强调色 - 珊瑚红 */
  --accent: #e94560;
  --accent-hover: #ff6b81;
  /* 渐变 */
  --gradient-1: linear-gradient(135deg, #0a1628 0%, #1a2a4a 50%, #0f3460 100%);
  --gradient-2: linear-gradient(135deg, #e94560 0%, #ff6b81 50%, #ff8a9e 100%);
  --gradient-3: linear-gradient(135deg, #0f3460 0%, #1a2a4a 50%, #16213e 100%);
  /* 毛玻璃 */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  /* 文字 */
  --text-primary: #f0f4ff;
  --text-secondary: #b0c4de;
  --text-muted: #7a8ba8;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(233, 69, 96, 0.3);
  /* 过渡 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  /* 暗色模式 */
  --bg-primary: #0a1628;
  --bg-secondary: #0f1a2e;
  --bg-card: rgba(255, 255, 255, 0.05);
  --bg-card-hover: rgba(255, 255, 255, 0.1);
}

/* 暗色模式覆盖（默认即为暗色，但保留切换能力） */
body.light-mode {
  --primary: #1a2a4a;
  --primary-light: #2a3a5a;
  --primary-dark: #0a1a2a;
  --gradient-1: linear-gradient(135deg, #e8f0fe 0%, #d0e0f0 50%, #b8d0e8 100%);
  --gradient-3: linear-gradient(135deg, #d0e0f0 0%, #e8f0fe 50%, #f0f4ff 100%);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.8);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --text-primary: #1a2a4a;
  --text-secondary: #4a5a7a;
  --text-muted: #7a8aa8;
  --bg-primary: #f0f4ff;
  --bg-secondary: #e8f0fe;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

/* ===== 基础重置 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  min-height: 100vh;
}

/* ===== 通用链接 ===== */
a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
  position: relative;
}

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

a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-2);
  transition: width var(--transition-normal);
}

a:hover::after {
  width: 100%;
}

/* ===== 标题 ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  color: var(--text-primary);
  position: relative;
  display: inline-block;
  margin-bottom: var(--space-2xl);
}

h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--gradient-2);
  border-radius: var(--radius-full);
}

h3 {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

/* ===== 容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

section {
  padding: var(--space-3xl) 0;
  position: relative;
}

/* ===== 导航栏 ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-normal);
}

body.light-mode header {
  background: rgba(240, 244, 255, 0.85);
}

header.scrolled {
  background: rgba(10, 22, 40, 0.95);
  box-shadow: var(--shadow-lg);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.nav-brand a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.nav-brand a:hover {
  transform: scale(1.05);
}

.nav-brand a::after {
  display: none;
}

.nav-brand svg {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 0 8px rgba(233, 69, 96, 0.3));
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-2);
  transition: width var(--transition-normal);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background: var(--glass-bg);
}

/* ===== 移动端导航 ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 22, 40, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.3s ease;
  }

  body.light-mode .nav-links {
    background: rgba(240, 244, 255, 0.98);
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .nav-links a {
    font-size: 1.1rem;
    padding: var(--space-sm) 0;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Hero 区域 ===== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-1);
  position: relative;
  overflow: hidden;
  padding: var(--space-3xl) var(--space-lg);
}

#hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(233, 69, 96, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 70% 50%, rgba(15, 52, 96, 0.2) 0%, transparent 50%);
  animation: heroBg 20s ease infinite;
}

@keyframes heroBg {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(2%, 1%) rotate(1deg); }
  66% { transform: translate(-1%, -1%) rotate(-1deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  margin-bottom: var(--space-lg);
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-2);
  color: #fff;
  border: none;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(233, 69, 96, 0.5);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-3px);
  border-color: var(--accent);
}

/* ===== 通用卡片 ===== */
.card,
article,
blockquote {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before,
article::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-2);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.card:hover::before,
article:hover::before {
  transform: scaleX(1);
}

.card:hover,
article:hover,
blockquote:hover {
  transform: translateY(-8px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-lg);
  border-color: rgba(233, 69, 96, 0.3);
}

/* ===== About 区域 ===== */
#about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

/* ===== Products 区域 ===== */
#products {
  background: var(--bg-primary);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

/* ===== Services 区域 ===== */
#services {
  background: var(--bg-secondary);
}

.services-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

/* ===== Advantages 区域 ===== */
#advantages {
  background: var(--gradient-3);
  position: relative;
}

#advantages::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

#advantages ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  position: relative;
  z-index: 1;
}

#advantages li {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  font-weight: 500;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

#advantages li::before {
  content: '✓';
  display: block;
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

#advantages li:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-md);
}

/* ===== Testimonials 区域 ===== */
#testimonials {
  background: var(--bg-primary);
}

blockquote {
  padding: var(--space-xl) var(--space-2xl);
  position: relative;
}

blockquote::before {
  content: '"';
  position: absolute;
  top: -10px;
  left: 20px;
  font-size: 4rem;
  color: var(--accent);
  opacity: 0.3;
  font-family: Georgia, serif;
}

blockquote p {
  font-style: italic;
  font-size: 1.1rem;
  line-height: 1.8;
}

/* ===== Case Studies 区域 ===== */
#case-studies {
  background: var(--bg-secondary);
}

#case-studies article {
  margin-bottom: var(--space-lg);
}

/* ===== Insights 区域 ===== */
#insights {
  background: var(--bg-primary);
}

.articles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.articles article {
  display: flex;
  flex-direction: column;
}

.articles article time {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: auto;
  margin-bottom: var(--space-sm);
}

.articles article a {
  align-self: flex-start;
  margin-top: var(--space-sm);
  font-weight: 600;
}

/* ===== FAQ 区域 ===== */
#faq {
  background: var(--bg-secondary);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.faq-list details {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.faq-list details:hover {
  border-color: rgba(233, 69, 96, 0.3);
  background: var(--bg-card-hover);
}

.faq-list details[open] {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.faq-list summary {
  font-weight: 600;
  color: var(--text-primary);
  padding: var(--space-sm) 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  list-style: none;
}

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

.faq-list summary::before {
  content: '+';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--gradient-2);
  color: #fff;
  border-radius: 50%;
  font-size: 1rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: transform var(--transition-normal);
}

.faq-list details[open] summary::before {
  content: '−';
  transform: rotate(180deg);
}

.faq-list details p {
  padding: var(--space-md) 0 var(--space-sm) var(--space-xl);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== HowTo 区域 ===== */
#howto {
  background: var(--bg-primary);
}

#howto ol {
  list-style: none;
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
}

#howto li {
  counter-increment: step;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  position: relative;
  transition: all var(--transition-normal);
}

#howto li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

#howto li::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--gradient-2);
  color: #fff;
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}

/* ===== Contact 区域 ===== */
#contact {
  background: var(--bg-secondary);
}

address {
  font-style: normal;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
}

address p {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition-normal);
}

address p:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.3);
}

/* ===== Footer ===== */
footer {
  background: var(--primary-dark);
  border-top: 1px solid var(--glass-border);
  padding: var(--space-3xl) var(--space-lg) var(--space-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-2xl);
  max-width: 1200px;
  margin: 0 auto;
}

.footer-section h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  font-size: 1.1rem;
}

.footer-section p,
.footer-section li {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--space-sm);
}

.footer-section a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-2xl);
  margin-top: var(--space-2xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ===== 返回顶部按钮 ===== */
#back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-2);
  color: #fff;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: all var(--transition-normal);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.1);
  box-shadow: 0 0 30px rgba(233, 69, 96, 0.6);
}

#back-to-top.show {
  display: flex;
  animation: fadeInUp 0.3s ease;
}

/* ===== 暗黑模式切换按钮 ===== */
.dark-mode-toggle {
  position: fixed;
  bottom: 90px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark-mode-toggle:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

/* ===== 滚动动画 ===== */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  section {
    padding: var(--space-2xl) 0;
  }
}

@media (max-width: 768px) {
  :root {
    --space-lg: 20px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 48px;
  }

  #hero {
    min-height: 80vh;
    padding: var(--space-2xl) var(--space-md);
  }

  .hero-content h1 {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
  }

  .about-grid,
  .cards,
  .services-list,
  .articles {
    grid-template-columns: 1fr;
  }

  #advantages ul {
    grid-template-columns: 1fr 1fr;
  }

  #howto ol {
    grid-template-columns: 1fr 1fr;
  }

  address {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
  }

  #back-to-top,
  .dark-mode-toggle {
    width: 40px;
    height: 40px;
    font-size: 1rem;
    bottom: 20px;
    right: 20px;
  }

  .dark-mode-toggle {
    bottom: 70px;
  }
}

@media (max-width: 480px) {
  #advantages ul {
    grid-template-columns: 1fr;
  }

  #howto ol {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}

/* ===== 自定义滚动条 ===== */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--gradient-2);
  border-radius: var(--radius-full);
}

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

/* ===== 选中文本样式 ===== */
::selection {
  background: rgba(233, 69, 96, 0.3);
  color: var(--text-primary);
}

/* ===== 焦点样式 ===== */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== 打印样式 ===== */
@media print {
  header,
  #back-to-top,
  .dark-mode-toggle {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  section {
    page-break-inside: avoid;
  }
}