/* ========================================
   杭州长仁科技有限公司 - 主样式表
   ======================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
}

/* ========== 通用类 ========== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
  position: relative;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  font-family: var(--font-display);
  position: relative;
  display: inline-block;
  letter-spacing: -0.5px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 20px auto 0;
  color: var(--text-secondary);
  line-height: 1.8;
  letter-spacing: 0.3px;
}

.text-center {
  text-align: center;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 12px 0;
  box-shadow: var(--shadow-md);
}

.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  position: relative;
}

.logo-icon svg {
  width: 32px;
  height: 32px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 汉堡菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* 移动端导航 */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .menu-toggle {
    display: flex;
  }

  .theme-switcher {
    position: fixed;
    bottom: 90px;
    right: 16px;
    z-index: 998;
    background: var(--surface);
    padding: 8px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    flex-direction: column;
    gap: 6px;
  }

  .theme-btn {
    width: 28px;
    height: 28px;
  }
}

/* ========== Hero 区域 ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 20px 80px;
  position: relative;
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 30px;
  font-size: 0.9rem;
  margin-bottom: 28px;
  backdrop-filter: blur(12px);
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.2rem;
  max-width: 620px;
  margin: 0 auto 40px;
  line-height: 1.9;
  opacity: 0.92;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: var(--transition);
  border: none;
  cursor: pointer;
  letter-spacing: 0.3px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-top: 60px;
  flex-wrap: wrap;
  position: relative;
}

.hero-stats::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.stat-item {
  text-align: center;
  min-width: 100px;
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
  font-family: var(--font-display);
}

.stat-label {
  font-size: 0.85rem;
  opacity: 0.7;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ========== 服务区块 ========== */
.services {
  background: var(--background-alt);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.service-card {
  padding: 40px 30px;
  text-align: center;
}

.card-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  border-radius: 16px;
  transition: var(--transition);
}

.service-card:hover .card-icon {
  transform: scale(1.08) translateY(-2px);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
  transition: var(--transition);
}

.service-card:hover .card-title {
  color: var(--primary);
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  position: relative;
}

.card-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: var(--transition);
}

.card-link:hover::after {
  width: 100%;
}

.card-link:hover {
  gap: 10px;
}

/* ========== 解决方案 ========== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.solution-card {
  padding: 40px 30px;
  text-align: left;
}

.solution-card .card-icon {
  margin: 0 0 24px;
  width: 60px;
  height: 60px;
}

.solution-features {
  margin-top: 20px;
}

.solution-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.solution-features li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
}

/* ========== 优势区块 ========== */
.advantages {
  background: var(--background-alt);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

@media (max-width: 992px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .advantages-grid {
    grid-template-columns: 1fr;
  }
}

.advantage-item {
  text-align: center;
  padding: 30px 20px;
  transition: var(--transition);
}

.advantage-item:hover {
  transform: translateY(-4px);
}

.advantage-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #ffffff;
  border-radius: 50%;
  box-shadow: 0 4px 14px rgba(26, 54, 93, 0.2);
  transition: var(--transition);
}

.advantage-item:hover .advantage-icon {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(26, 54, 93, 0.3);
}

.advantage-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.advantage-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========== 案例展示 ========== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.case-card {
  overflow: hidden;
  padding: 0;
}

.case-image {
  height: 200px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  color: rgba(255, 255, 255, 0.8);
  position: relative;
  overflow: hidden;
}

.case-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(0, 0, 0, 0.15) 100%);
  transition: var(--transition);
}

.case-card:hover .case-image::after {
  background: linear-gradient(180deg, transparent 40%, rgba(0, 0, 0, 0.25) 100%);
}

.case-content {
  padding: 30px;
}

.case-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(49, 130, 206, 0.1);
  color: var(--primary);
  font-size: 0.8rem;
  border-radius: 20px;
  margin-bottom: 16px;
}

.case-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.case-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== 联系区块 ========== */
.contact {
  background: var(--background-alt);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

@media (max-width: 768px) {
  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.contact-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #ffffff;
  border-radius: 12px;
  flex-shrink: 0;
  box-shadow: 0 3px 10px rgba(26, 54, 93, 0.2);
}

.contact-text h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.contact-text p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.contact-form {
  background: var(--surface);
  padding: 40px;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  position: relative;
}

.contact-form::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary-light));
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  font-size: 1rem;
  color: var(--text-primary);
  background: var(--background);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 576px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

.btn-submit {
  width: 100%;
  padding: 16px;
  font-size: 1rem;
}

/* ========== 底部 ========== */
.footer {
  padding: 60px 0 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (max-width: 992px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 576px) {
  .footer-content {
    grid-template-columns: 1fr;
  }
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  margin-bottom: 20px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  opacity: 0.8;
}

.footer-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  opacity: 0.8;
  transition: var(--transition);
}

.footer-links a:hover {
  opacity: 1;
  color: var(--accent);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  font-size: 0.85rem;
  opacity: 0.7;
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

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

/* ========== 页面标题区 ========== */
.page-header {
  padding: 160px 0 80px;
  text-align: center;
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  color: #ffffff;
}

.page-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: #ffffff;
}

.page-subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* ========== 关于页面 ========== */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

@media (max-width: 768px) {
  .about-intro {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.about-image {
  height: 400px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
  color: rgba(255, 255, 255, 0.5);
  overflow: hidden;
  position: relative;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
}

.about-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.about-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

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

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

@keyframes shimmer {
  0% {
    background-position: -200% center;
  }
  100% {
    background-position: 200% center;
  }
}

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

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 15px rgba(26, 54, 93, 0.15);
  }
  50% {
    box-shadow: 0 0 25px rgba(26, 54, 93, 0.25);
  }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fadeIn {
  animation: fadeIn 0.6s ease forwards;
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

/* 滚动触发动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 卡片悬停效果 */
.card-hover {
  transition: var(--transition);
}

.card-hover:hover {
  transform: translateY(-8px);
}

/* ========== 辅助类 ========== */
.mt-4 { margin-top: 32px; }
.mb-4 { margin-bottom: 32px; }
.py-4 { padding-top: 32px; padding-bottom: 32px; }

/* ========== 导航激活状态 ========== */
.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-link.active::after {
  width: 100%;
}

/* ========== 案例统计标签 ========== */
.case-stats {
  margin-top: 16px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.case-stat {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ========== 客户评价 ========== */
.testimonial-quote {
  font-style: italic;
  margin-bottom: 20px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  flex-shrink: 0;
}

.testimonial-name {
  font-weight: 600;
}

.testimonial-role {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ========== CTA 区域 ========== */
.cta-desc {
  margin: 20px 0;
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* ========== 地图占位 ========== */
.map-placeholder {
  height: 300px;
  background: var(--background-alt);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 30px;
}

/* ========== 二维码区域 ========== */
.qr-grid {
  grid-template-columns: repeat(3, 1fr);
}

.qr-placeholder {
  width: 120px;
  height: 120px;
  background: var(--background-alt);
  margin: 0 auto 20px;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-item {
  padding: 40px;
}

/* ========== 联系页面标题 ========== */
.contact-section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.contact-section-desc {
  color: var(--text-secondary);
  margin-bottom: 30px;
}

/* ========== 页面标题子元素 ========== */
.page-header .container p {
  max-width: 600px;
  margin: 0 auto;
}

/* ========== SVG 图标 ========== */
.icon-svg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  vertical-align: middle;
  line-height: 1;
}

.icon-svg svg {
  width: 100%;
  height: 100%;
}

.card-icon .icon-svg {
  width: 28px;
  height: 28px;
}

.advantage-icon .icon-svg {
  width: 24px;
  height: 24px;
}

.contact-icon .icon-svg {
  width: 20px;
  height: 20px;
}

.logo-icon .icon-svg svg {
  width: 32px;
  height: 32px;
  color: inherit;
}

.back-to-top .icon-svg {
  width: 22px;
  height: 22px;
}

.case-image .icon-svg {
  width: 48px;
  height: 48px;
}

.hero-badge .icon-svg {
  width: 18px;
  height: 18px;
}

.about-image .icon-svg {
  width: 80px;
  height: 80px;
  opacity: 0.6;
}

/* ========== Skip Link (BEM: .skip-link) ========== */
.skip-link {
  position: absolute;
  top: -50px;
  left: 0;
  padding: 12px 20px;
  background: var(--primary);
  color: #fff;
  z-index: 10000;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 var(--border-radius) 0;
  transition: top 0.2s ease;
}

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

/* ========== 面包屑导航 (BEM: .breadcrumb) ========== */
.breadcrumb-nav {
  padding: 12px 0;
  background: var(--nav-bg, var(--surface));
  border-bottom: 1px solid var(--border);
  margin-top: 60px;
}

.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.9rem;
}

.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item:not(:last-child)::after {
  content: '/';
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.breadcrumb__link {
  color: var(--primary);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 4px;
  transition: var(--transition);
}

.breadcrumb__link:hover {
  color: var(--accent);
  background: rgba(0, 0, 0, 0.03);
}

.breadcrumb__text {
  color: var(--text-secondary);
}

/* ========== 站内搜索 ========== */
.search-toggle {
  background: none;
  border: none;
  padding: 12px;
  min-width: 48px;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition);
  border-radius: var(--border-radius);
}

.search-toggle:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--primary);
}

.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  backdrop-filter: blur(4px);
}

.search-overlay.active {
  opacity: 1;
  visibility: visible;
}

.search-modal {
  background: var(--surface);
  border-radius: var(--border-radius-lg);
  width: 90%;
  max-width: 640px;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: translateY(-20px);
  transition: transform 0.3s ease;
}

.search-overlay.active .search-modal {
  transform: translateY(0);
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.search-input-wrap .icon-svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--text-secondary);
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1.1rem;
  background: transparent;
  color: var(--text-primary);
  font-family: inherit;
}

.search-input::placeholder {
  color: var(--text-light);
}

.search-close {
  background: none;
  border: none;
  padding: 8px;
  min-width: 40px;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.search-close:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.05);
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: 8px 0;
}

.search-results:empty::after {
  content: '';
  display: none;
}

.search-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.search-result-item {
  display: block;
  padding: 14px 20px;
  color: var(--text-primary);
  transition: var(--transition);
}

.search-result-item:hover {
  background: var(--background-alt);
  color: var(--primary);
}

.search-result-title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 4px;
}

.search-result-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.search-hint {
  padding: 12px 20px;
  font-size: 0.8rem;
  color: var(--text-light);
  border-top: 1px solid var(--border);
  text-align: center;
}

/* ========== 图片懒加载 ========== */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.4s ease;
}

img[loading="lazy"].loaded,
img.loaded {
  opacity: 1;
}

.img-lazy {
  background: var(--background-alt);
}

/* ========== 移动端触控目标优化 (≥48px) ========== */
@media (max-width: 768px) {
  .nav-link {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 12px 16px;
    font-size: 1rem;
  }

  .menu-toggle {
    min-width: 48px;
    min-height: 48px;
    padding: 12px;
  }

  .theme-btn {
    width: 40px;
    height: 40px;
  }

  .search-toggle {
    min-width: 48px;
    min-height: 48px;
    padding: 12px;
  }

  .breadcrumb__link {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    padding: 12px 8px;
  }

  .card-link {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
  }

  .btn {
    min-height: 48px;
    padding: 14px 24px;
  }

  .btn-submit {
    min-height: 48px;
  }

  .form-control {
    min-height: 48px;
    font-size: 16px;
  }

  textarea.form-control {
    min-height: 100px;
  }

  .footer-links a {
    display: inline-block;
    min-height: 48px;
    line-height: 48px;
    padding: 0 4px;
  }
}