/* ========================================
   高科电力企业官网 - 公共样式 v2.0
   现代化、创新、环保科技风格
   包含：变量、重置、工具类、导航栏、页脚、按钮、通用组件
   ======================================== */

/* ==================== 基础设置 ==================== */
:root {
  /* 主色调 - 深海科技蓝 */
  --primary-dark: #061c2e;
  --primary-blue: #0a2a45;
  --tech-blue: #0066ff;
  --tech-blue-light: #3385ff;
  --tech-blue-dark: #0052cc;

  /* 辅助色 */
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  /* 点缀色 - 极光环保绿 */
  --eco-green: #00d4aa;
  --eco-green-light: #33ddbf;
  --eco-green-dark: #00aa88;
  --accent-gold: #00d4aa;
  --accent-orange: #33ddbf;
  --accent-gold-light: #66e7d4;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
  --gradient-tech: linear-gradient(135deg, var(--tech-blue) 0%, var(--eco-green) 100%);
  --gradient-hero: linear-gradient(135deg, rgba(6, 28, 46, 0.96) 0%, rgba(10, 42, 69, 0.9) 50%, rgba(0, 102, 255, 0.15) 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(0, 212, 170, 0.15) 0%, transparent 60%);

  /* 字体 */
  --font-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4.5rem;
  --spacing-4xl: 6rem;

  /* 圆角 */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;

  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(6, 28, 46, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(6, 28, 46, 0.08), 0 2px 4px -2px rgba(6, 28, 46, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(6, 28, 46, 0.1), 0 4px 6px -4px rgba(6, 28, 46, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(6, 28, 46, 0.12), 0 8px 10px -6px rgba(6, 28, 46, 0.05);
  --shadow-2xl: 0 25px 50px -12px rgba(6, 28, 46, 0.25);
  --shadow-glow: 0 0 30px rgba(0, 212, 170, 0.25);
  --shadow-blue-glow: 0 0 30px rgba(0, 102, 255, 0.25);

  /* 过渡 */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 容器宽度 */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1440px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

/* 锚点跳转偏移：避免目标板块被固定导航遮挡 */
[id] {
  scroll-margin-top: 80px;
}

body {
  font-family: var(--font-cn);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--gray-700);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* ==================== 工具类 ==================== */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.container-lg {
  max-width: var(--container-2xl);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-lg {
  padding: var(--spacing-4xl) 0;
}

/* 滚动动画初始状态 */
[data-aos] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-aos].aos-animate {
  opacity: 1;
  transform: translateY(0);
}

[data-aos="fade-up"] {
  transform: translateY(40px);
}

[data-aos="fade-down"] {
  transform: translateY(-40px);
}

[data-aos="fade-left"] {
  transform: translateX(40px);
}

[data-aos="fade-right"] {
  transform: translateX(-40px);
}

[data-aos="zoom-in"] {
  transform: scale(0.92);
}

/* ==================== 按钮样式 ==================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 1rem 2rem;
  background: var(--gradient-tech);
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  box-shadow: 0 4px 15px rgba(0, 102, 255, 0.35);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 102, 255, 0.5), 0 0 20px rgba(0, 212, 170, 0.2);
}

.btn-primary:hover::before {
  transform: translateX(100%);
}

.btn-primary svg {
  transition: transform var(--transition-fast);
}

.btn-primary:hover svg {
  transform: translateX(3px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 1rem 2rem;
  border: 1.5px solid rgba(255, 255, 255, 0.7);
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  background: transparent;
  position: relative;
  overflow: hidden;
}

.btn-outline::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.1);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.btn-outline:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.btn-outline:hover::before {
  transform: scaleX(1);
}

.btn-contact {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.625rem 1.25rem;
  background: var(--gradient-tech);
  color: var(--white);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  box-shadow: 0 2px 10px rgba(0, 102, 255, 0.25);
}

.btn-contact:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 102, 255, 0.35);
}

/* ==================== 导航栏 ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(6, 28, 46, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(6, 28, 46, 0.96);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
  padding: 0 var(--spacing-2xl);
  max-width: var(--container-2xl);
  margin: 0 auto;
}

/* Logo区域 */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.navbar-logo-icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 4px;
  box-sizing: border-box;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.02em;
  font-family: var(--font-en);
}

.navbar-logo-text span {
  color: var(--accent-gold);
}

/* 导航菜单 */
.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-2xl);
}

.navbar-link {
  position: relative;
  font-size: 1rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  padding: var(--spacing-sm) 0;
  transition: color var(--transition-fast);
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-tech);
  transition: width var(--transition-normal);
  border-radius: 2px;
}

.navbar-link:hover,
.navbar-link.active {
  color: var(--white);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  width: 100%;
}

/* 导航右侧操作区 */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

/* 移动端菜单按钮 */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-sm);
  cursor: pointer;
}

.navbar-toggle span {
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all var(--transition-fast);
}

.navbar-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.navbar-toggle.active span:nth-child(2) {
  opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端菜单 */
.navbar-menu-mobile {
  display: none !important;
  position: fixed;
  top: 84px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(6, 28, 46, 0.98);
  backdrop-filter: blur(20px);
  padding: var(--spacing-xl);
  padding-bottom: calc(var(--spacing-xl) + 70px);
  flex-direction: column;
  gap: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  overflow-y: auto;
  z-index: 1001;
}

.navbar-menu-mobile.active {
  display: flex !important;
}

.navbar-menu-mobile .navbar-link {
  font-size: 1.125rem;
  padding: var(--spacing-md) 0;
}

/* ==================== 导航二级下拉菜单 ==================== */
.navbar-dropdown {
  position: relative;
}

.navbar-caret {
  width: 14px;
  height: 14px;
  margin-left: 4px;
  vertical-align: -2px;
  transition: transform var(--transition-fast);
}

.navbar-dropdown:hover .navbar-caret {
  transform: rotate(180deg);
}

.navbar-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translate(-50%, 12px);
  min-width: 220px;
  padding: var(--spacing-sm) 0;
  background: rgba(6, 28, 46, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: 200;
}

.navbar-dropdown-menu::before {
  content: '';
  position: absolute;
  top: -16px;
  left: 0;
  right: 0;
  height: 16px;
}

.navbar-dropdown:hover .navbar-dropdown-menu,
.navbar-dropdown:focus-within .navbar-dropdown-menu,
.navbar-dropdown.open .navbar-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.navbar-dropdown.open .navbar-caret {
  transform: rotate(180deg);
}

.navbar-dropdown-item {
  display: block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.8);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.navbar-dropdown-item:hover {
  color: var(--white);
  background: rgba(255, 255, 255, 0.06);
}

.navbar-dropdown-item.active {
  color: var(--accent-gold);
}

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

.navbar-mobile-group-header .navbar-link {
  flex: 1;
}

.navbar-mobile-subtoggle {
  background: none;
  border: none;
  color: var(--white);
  cursor: pointer;
  padding: var(--spacing-sm);
  display: flex;
  align-items: center;
}

.navbar-mobile-subtoggle .navbar-caret {
  margin-left: 0;
  width: 18px;
  height: 18px;
}

.navbar-mobile-subtoggle.active .navbar-caret {
  transform: rotate(180deg);
}

.navbar-mobile-submenu {
  display: none;
  flex-direction: column;
  padding-left: var(--spacing-lg);
}

.navbar-mobile-submenu.open {
  display: flex;
}

.navbar-mobile-submenu a {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-sm) 0;
  transition: color var(--transition-fast);
}

.navbar-mobile-submenu a:hover,
.navbar-mobile-submenu a.active {
  color: var(--accent-gold);
}

/* ==================== 页脚 ==================== */
.footer {
  background: var(--primary-dark);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 170, 0.5), rgba(0, 102, 255, 0.4), transparent);
}

.footer::after {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 102, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-3xl);
  position: relative;
  z-index: 1;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.footer-logo-icon {
  width: 44px;
  height: 44px;
  object-fit: contain;
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 4px;
  box-sizing: border-box;
}

.footer-logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  font-family: var(--font-en);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--gradient-tech);
  border-radius: 2px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer-link {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.footer-link::before {
  content: '';
  width: 0;
  height: 1.5px;
  background: var(--accent-gold);
  transition: width var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-gold);
  transform: translateX(4px);
}

.footer-link:hover::before {
  width: 12px;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.footer-contact-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent-gold);
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-bottom {
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  z-index: 1;
}

.footer-copyright {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.footer-icp {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.footer-icp a {
  color: inherit;
  transition: color var(--transition-fast);
}

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

/* ==================== 回到顶部按钮 ==================== */
.back-to-top {
  position: fixed;
  bottom: 100px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--gradient-tech);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: 999;
  cursor: pointer;
}

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

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
}

/* ==================== 底部悬浮条 ==================== */
.floating-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(6, 28, 46, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--spacing-md) var(--spacing-xl);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-2xl);
  z-index: 998;
}

.floating-bar-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
  cursor: pointer;
}

.floating-bar-item:hover {
  color: var(--accent-gold);
}

.floating-bar-item svg {
  width: 20px;
  height: 20px;
}

.floating-bar-divider {
  width: 1px;
  height: 20px;
  background: rgba(255, 255, 255, 0.15);
}

/* ==================== Section Header（通用） ==================== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(0, 102, 255, 0.08);
  color: var(--tech-blue);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.05em;
  font-family: var(--font-en);
}

.section-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--eco-green);
  border-radius: 50%;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  line-height: 1.25;
}

.section-title span {
  color: var(--tech-blue);
}

.section-desc {
  font-size: 1.125rem;
  color: var(--gray-500);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ==================== 底部CTA（通用） ==================== */
.cta {
  background: var(--gradient-tech);
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 40%),
    radial-gradient(circle at 90% 50%, rgba(0, 212, 170, 0.2) 0%, transparent 35%);
}

.cta::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.cta-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--spacing-3xl) 0;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--spacing-md);
  line-height: 1.25;
}

.cta-desc {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--spacing-2xl);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.cta .btn-primary {
  background: var(--white);
  color: var(--tech-blue);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.cta .btn-primary:hover {
  background: var(--accent-gold);
  color: var(--white);
  box-shadow: 0 8px 25px rgba(0, 212, 170, 0.4);
}

/* ==================== 面包屑导航（通用） ==================== */
.breadcrumb {
  background: var(--gray-50);
  padding: calc(80px + 1rem) 0 var(--spacing-lg);
}

.breadcrumb-container,
.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--gray-500);
  flex-wrap: wrap;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.breadcrumb-container a,
.breadcrumb-inner a {
  color: var(--tech-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-container a:hover,
.breadcrumb-inner a:hover {
  color: var(--tech-blue-dark);
}

.breadcrumb-item.active,
.breadcrumb-inner span {
  color: var(--gray-700);
  font-weight: 600;
}

.breadcrumb-separator,
.breadcrumb-inner svg {
  color: var(--gray-300);
  flex-shrink: 0;
}

/* ==================== 返回链接（通用） ==================== */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast);
  margin-bottom: var(--spacing-lg);
}

.back-link:hover {
  color: var(--white);
}

.back-link svg {
  transition: transform var(--transition-fast);
}

.back-link:hover svg {
  transform: translateX(-4px);
}

/* ==================== Page Hero（通用） ==================== */
.page-hero {
  background: var(--gradient-primary);
  padding: 170px 0 90px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(0, 102, 255, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(0, 212, 170, 0.15) 0%, transparent 40%);
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 50px 50px;
}

.page-hero-content {
  position: relative;
  z-index: 1;
}

.page-hero-title {
  font-size: 3rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.page-hero-desc {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ==================== 响应式设计 ==================== */

/* 大屏幕 (1440px+) */
@media (min-width: 1440px) {
  .section-title,
  .cta-title,
  .page-hero-title {
    font-size: 3rem;
  }
}

/* 平板 (1024px - 1439px) */
@media (max-width: 1439px) {
  .container {
    max-width: var(--container-lg);
  }

  .navbar-menu {
    gap: var(--spacing-xl);
  }
}

/* 小屏幕 (1024px - 1200px) */
@media (max-width: 1200px) {
  .navbar-menu {
    gap: var(--spacing-lg);
  }

  .navbar-link {
    font-size: 0.9375rem;
  }
}

/* 小平板 (768px - 1023px) */
@media (max-width: 1023px) {
  .navbar-menu {
    display: none;
  }

  .navbar-toggle {
    display: flex;
  }

  .navbar-actions {
    display: none;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
  }

  .section-title,
  .cta-title,
  .page-hero-title {
    font-size: 2rem;
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .section-lg {
    padding: var(--spacing-3xl) 0;
  }
}

/* 手机 (< 768px) */
@media (max-width: 767px) {
  :root {
    font-size: 15px;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  /* 移动端面包屑：不折行，超长时横向滚动 */
  .breadcrumb-container,
  .breadcrumb-inner {
    flex-wrap: nowrap;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 2px;
  }

  .breadcrumb-container::-webkit-scrollbar,
  .breadcrumb-inner::-webkit-scrollbar {
    display: none;
  }

  .breadcrumb-container a,
  .breadcrumb-inner a {
    flex-shrink: 0;
  }

  .breadcrumb-item {
    flex-shrink: 0;
  }

  .navbar-container {
    height: 64px;
    padding: 0 var(--spacing-md);
  }

  .navbar-logo-icon {
    width: 38px;
    height: 38px;
  }

  .navbar-logo-text {
    font-size: 1.15rem;
  }

  .navbar-toggle {
    width: 40px;
    height: 40px;
  }

  /* 移动端菜单：高度为屏幕的 60% */
  .navbar-menu-mobile {
    top: 64px;
    height: 60vh;
    height: 60dvh;
    bottom: auto;
    padding: 0 0 var(--spacing-md);
    justify-content: flex-start;
    gap: 0;
    border-top: none;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    box-shadow: var(--shadow-2xl);
  }

  .navbar-menu-mobile.active {
    display: flex !important;
  }

  .mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    padding: 0 var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
  }

  .mobile-menu-logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 0.5px;
  }

  .mobile-menu-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    color: var(--white);
    cursor: pointer;
    transition: all var(--transition-fast);
  }

  .mobile-menu-close:hover {
    background: rgba(255, 255, 255, 0.15);
  }

  .mobile-menu-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .navbar-menu-mobile > .navbar-link,
  .navbar-menu-mobile > .navbar-mobile-group,
  .navbar-menu-mobile > .btn-contact {
    margin: 0;
  }

  .navbar-menu-mobile .navbar-link {
    font-size: 1.125rem;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .navbar-menu-mobile > .btn-contact {
    margin-top: var(--spacing-lg);
  }

  .section-title,
  .cta-title,
  .page-hero-title {
    font-size: 1.75rem;
  }

  .section-desc,
  .cta-desc,
  .page-hero-desc {
    font-size: 1rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .floating-bar {
    padding: var(--spacing-sm) var(--spacing-md);
    gap: var(--spacing-md);
  }

  .floating-bar-item {
    font-size: 0.8125rem;
  }

  .back-to-top {
    bottom: 80px;
    right: 20px;
    width: 44px;
    height: 44px;
  }

  .page-hero {
    padding: 130px 0 70px;
  }

  .page-hero-title {
    font-size: 2rem;
  }

  .page-hero-desc {
    font-size: 1rem;
  }
}

/* 超小屏幕 (< 480px) */
@media (max-width: 479px) {
  .section-title,
  .cta-title,
  .page-hero-title {
    font-size: 1.5rem;
  }

  .btn-primary,
  .btn-outline {
    padding: 0.875rem 1.5rem;
    width: 100%;
    justify-content: center;
  }
}

/* ==================== 打印样式 ==================== */
@media print {
  .navbar,
  .floating-bar,
  .back-to-top {
    display: none !important;
  }

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