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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: #333;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

ul {
  list-style: none;
}

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

/* ========== 通用变量 ========== */
:root {
  --primary: #0a4b8c;
  --primary-light: #1565c0;
  --primary-dark: #07305c;
  --accent: #f59e0b;
  --accent-light: #fbbf24;
  --text-dark: #1a1a2e;
  --text-body: #4a5568;
  --text-light: #718096;
  --bg-light: #f7f9fc;
  --bg-alt: #eef3f9;
  --border: #e2e8f0;
  --shadow-sm: 0 2px 8px rgba(10, 75, 140, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 75, 140, 0.1);
  --shadow-lg: 0 20px 40px rgba(10, 75, 140, 0.12);
}

/* ========== 容器 ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-light);
  border-color: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(10, 75, 140, 0.3);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: #fff;
  color: var(--primary);
  border-color: #fff;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 16px;
}

/* ========== 顶部信息栏 ========== */
.top-bar {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.8);
  font-size: 13px;
  padding: 8px 0;
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.top-bar-divider {
  opacity: 0.3;
}

/* ========== 导航栏 ========== */
.header {
  background: #fff;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
}

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

.logo-mark {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  border-radius: 4px;
  letter-spacing: 2px;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.logo-cn {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-dark);
}

.logo-en {
  font-size: 11px;
  color: var(--text-light);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-item {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-body);
  position: relative;
  padding: 6px 0;
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.nav-item:hover,
.nav-item.active {
  color: var(--primary);
}

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

/* 语言切换 */
.lang-switcher {
  display: flex;
  align-items: center;
  background: var(--bg-light);
  border-radius: 20px;
  padding: 3px;
  margin-left: 20px;
}

.lang-switcher button {
  padding: 5px 12px;
  border: none;
  background: transparent;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-light);
  cursor: pointer;
  border-radius: 16px;
  transition: all 0.3s ease;
  font-family: inherit;
}

.lang-switcher button.active {
  background: var(--primary);
  color: #fff;
}

.lang-switcher button:hover:not(.active) {
  color: var(--primary);
}

/* ========== 首屏 Banner ========== */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #07305c 0%, #0a4b8c 50%, #1565c0 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(21, 101, 192, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(245, 158, 11, 0.15) 0%, transparent 40%);
}

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 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");
  opacity: 0.5;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 80px 24px;
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-light);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 24px;
}

.hero-title-accent {
  color: var(--accent-light);
}

.hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.hero-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.hero-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.hero-card-1 {
  grid-column: 1;
  grid-row: 1;
}

.hero-card-2 {
  grid-column: 2;
  grid-row: 1 / span 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-card-3 {
  grid-column: 1;
  grid-row: 2;
}

.hero-card-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  color: var(--accent-light);
}

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

.hero-card-num {
  font-size: 32px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.hero-card-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

/* ========== 通用 Section ========== */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-light);
}

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

.section-subtitle {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 3px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}

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

.section-title-left {
  display: block;
}

.section-title-left::after {
  left: 0;
  transform: none;
}

.section-desc {
  font-size: 16px;
  color: var(--text-light);
  margin-top: 28px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ========== 核心优势 ========== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.advantage-card {
  background: #fff;
  border-radius: 12px;
  padding: 40px 28px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.4s ease;
  border: 1px solid var(--border);
}

.advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.advantage-card:hover .advantage-icon {
  transform: scale(1.1) rotate(-5deg);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
}

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

.advantage-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.advantage-desc {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

/* ========== 主营产品 ========== */
.product-categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.product-cat {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.4s ease;
}

.product-cat:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-cat-image {
  height: 220px;
  position: relative;
  overflow: hidden;
}

.product-cat-1 {
  background: linear-gradient(135deg, #1e3a5f 0%, #2d5a87 50%, #3d7ab5 100%);
}

.product-cat-2 {
  background: linear-gradient(135deg, #4a3728 0%, #6b4c35 50%, #8b6b4a 100%);
}

.product-cat-3 {
  background: linear-gradient(135deg, #2d4a3e 0%, #3d6b5a 50%, #5a8b7a 100%);
}

.product-cat-overlay {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M40 40c0-11.046-8.954-20-20-20S0 28.954 0 40s8.954 20 20 20 20-8.954 20-20zm40 0c0-11.046-8.954-20-20-20s-20 8.954-20 20 8.954 20 20 20 20-8.954 20-20z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.product-cat-title {
  position: absolute;
  bottom: 24px;
  left: 28px;
  color: #fff;
  z-index: 1;
}

.product-cat-title h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 4px;
}

.product-cat-title span {
  font-size: 12px;
  opacity: 0.7;
  letter-spacing: 1px;
}

.product-cat-list {
  padding: 24px 28px;
  border-bottom: 1px solid var(--border);
}

.product-cat-list li {
  padding: 10px 0;
  color: var(--text-body);
  font-size: 14px;
  border-bottom: 1px dashed var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.product-cat-list li:last-child {
  border-bottom: none;
}

.product-cat-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.product-cat-more {
  display: block;
  padding: 16px 28px;
  color: var(--primary);
  font-weight: 500;
  font-size: 14px;
}

.product-cat-more:hover {
  background: var(--bg-light);
  color: var(--primary-light);
  padding-left: 36px;
}

/* ========== 关于我们 首页摘要 ========== */
.about-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-preview-desc {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.9;
  margin-bottom: 20px;
}

.about-preview-stats {
  display: flex;
  align-items: center;
  gap: 40px;
  margin: 40px 0;
  padding: 28px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stat-item {
  text-align: center;
  flex: 1;
}

.stat-num {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-num span {
  font-size: 20px;
  color: var(--accent);
}

.stat-label {
  font-size: 13px;
  color: var(--text-light);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.about-preview-visual {
  position: relative;
  height: 480px;
}

.about-image-main {
  position: absolute;
  top: 0;
  right: 0;
  width: 80%;
  height: 380px;
  background: linear-gradient(135deg, #0a4b8c 0%, #1565c0 100%);
  border-radius: 12px;
  overflow: hidden;
}

.about-image-main::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.06'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.about-image-sub {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 55%;
  height: 200px;
  background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
  border-radius: 12px;
  border: 8px solid #fff;
  box-shadow: var(--shadow-md);
}

.about-badge {
  position: absolute;
  bottom: 60px;
  right: 20px;
  background: #fff;
  border-radius: 12px;
  padding: 20px 28px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.about-badge-num {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 4px;
}

.about-badge-text {
  font-size: 13px;
  color: var(--text-light);
}

/* ========== CTA 联系 ========== */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 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");
}

.cta-inner {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
}

.cta-content h2 {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.cta-content p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 15px;
}

.cta-actions {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-shrink: 0;
}

.cta-phone {
  text-align: right;
}

.cta-phone-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 4px;
}

.cta-phone-num {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent-light);
}

/* ========== 页脚 ========== */
.footer {
  background: #0f172a;
  color: rgba(255, 255, 255, 0.7);
  padding-top: 70px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 50px;
  padding-bottom: 50px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-logo-text {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.5);
}

.footer-title {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 24px;
  position: relative;
  padding-bottom: 12px;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
}

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

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  transition: all 0.3s ease;
}

.footer-links a:hover {
  color: var(--accent-light);
  padding-left: 6px;
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 14px;
}

.contact-icon {
  width: 20px;
  height: 20px;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

.footer-bottom-inner {
  text-align: center;
}

/* ========== 页面 Banner（内页通用） ========== */
.page-banner {
  height: 280px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 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");
}

.page-banner-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  width: 100%;
}

.page-banner h1 {
  font-size: 36px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.page-banner-nav {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.page-banner-nav a:hover {
  color: var(--accent-light);
}

.page-banner-nav .current {
  color: var(--accent-light);
}

/* ========== 响应式 ========== */
@media (max-width: 992px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-title {
    font-size: 32px;
  }

  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-categories {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .about-preview {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-preview-visual {
    height: 400px;
  }

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

  .cta-inner {
    flex-direction: column;
    text-align: center;
  }

  .cta-actions {
    flex-direction: column;
  }

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

@media (max-width: 640px) {
  .top-bar {
    display: none;
  }

  .mobile-menu-btn { display: flex; }
  .nav { display: none !important; }
  .header { padding: 12px 0 !important; }

  .nav {
    gap: 20px;
  }

  .nav-item {
    font-size: 14px;
  }

  .logo-cn {
    font-size: 14px;
  }

  .logo-en {
    display: none;
  }

  .hero-title {
    font-size: 26px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 26px;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .about-preview-stats {
    flex-wrap: wrap;
    gap: 20px;
  }

  .stat-divider {
    display: none;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-title {
    font-size: 16px;
  }

  .footer-links li,
  .footer-contact li {
    font-size: 14px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .page-banner {
    height: 200px;
    padding-top: 56px;
  }

  .page-banner h1 {
    font-size: 26px;
  }

  .page-banner-nav {
    font-size: 13px;
  }

  .section {
    padding: 48px 0;
  }

  .section-title {
    font-size: 24px;
  }

  .section-desc {
    font-size: 14px;
    line-height: 1.7;
  }
}

/* ============================================
   移动端汉堡菜单 & 抽屉导航（全局）
   ============================================ */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.1);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  gap: 5px;
  padding: 0;
  z-index: 1001;
}

.mobile-menu-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-drawer-mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1002;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.mobile-drawer-mask.active {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: -80%;
  width: 80%;
  max-width: 320px;
  height: 100%;
  background: #0A2540;
  z-index: 1003;
  transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 20px rgba(0,0,0,0.3);
}

.mobile-drawer.active {
  right: 0;
}

.mobile-drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.mobile-drawer-title {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.mobile-drawer-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.1);
  border: none;
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
}

.mobile-drawer-body {
  flex: 1;
  padding: 16px 0;
  overflow-y: auto;
}

.mobile-nav-item {
  display: flex;
  align-items: center;
  padding: 16px 24px;
  font-size: 16px;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
  color: var(--brand-yellow);
  background: rgba(245, 184, 0, 0.08);
  border-left-color: var(--brand-yellow);
}

.mobile-drawer-divider {
  height: 1px;
  background: rgba(255,255,255,0.1);
  margin: 12px 24px;
}

.mobile-nav-external {
  font-weight: 500;
}

.mobile-nav-1688 {
  color: var(--brand-dark) !important;
  background: var(--brand-yellow) !important;
  margin: 0 24px;
  border-radius: 6px;
  font-weight: 700;
  border-left: none !important;
  justify-content: center;
}

.mobile-lang-wrap {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-lang-label {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
}

.mobile-lang-switcher {
  display: flex;
  background: rgba(255,255,255,0.1);
  border-radius: 6px;
  padding: 3px;
}

.mobile-lang-switcher button {
  padding: 6px 14px;
  font-size: 13px;
  border: none;
  background: transparent;
  color: rgba(255,255,255,0.7);
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
}

.mobile-lang-switcher button.active {
  background: var(--brand-yellow);
  color: var(--brand-dark);
}


/* 视觉隐藏 — 用于SEO/无障碍，屏幕阅读器可读，视觉不可见 */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}


/* 跳过导航链接 — 键盘无障碍，聚焦时可见 */
.skip-link {
  position: absolute;
  top: -40px;
  left: 1rem;
  z-index: 1000;
  padding: 0.75rem 1.5rem;
  background: var(--primary-600, #0a2540);
  color: #fff;
  text-decoration: none;
  border-radius: 0 0 6px 6px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 0;
  outline: 2px solid var(--accent-500, #d4a853);
  outline-offset: 2px;
}