/* ========== 全局重置与基础 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-light);
  color: var(--text-light);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}
a {
  color: var(--primary);
  text-decoration: none;
}
ul {
  list-style: none;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========== CSS 变量 & 暗色模式 ========== */
:root {
  --primary: #e94560;
  --primary-dark: #c73e54;
  --secondary: #0f3460;
  --accent: #16213e;
  --bg-light: #f8f9fa;
  --bg-dark: #1a1a2e;
  --text-light: #2d3436;
  --text-dark: #e0e0e0;
  --glass: rgba(255, 255, 255, 0.12);
  --glass-dark: rgba(0, 0, 0, 0.3);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius: 16px;
  --transition: 0.3s ease;
}
.dark {
  --bg-light: #1a1a2e;
  --text-light: #e0e0e0;
  --glass: rgba(0, 0, 0, 0.3);
}

/* ========== 容器 & 布局 ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 80px 0;
}
.section-title {
  text-align: center;
  font-size: 36px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-sub {
  text-align: center;
  font-size: 18px;
  color: var(--text-light);
  opacity: 0.8;
  margin-bottom: 48px;
}
.grid {
  display: grid;
  gap: 32px;
}
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.text-center {
  text-align: center;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-block;
  padding: 12px 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: none;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.4);
}

/* ========== 卡片 ========== */
.card {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.18);
}

/* ========== 滚动动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Header / 导航 ========== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(26, 26, 46, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background 0.3s;
}
header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
header nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 1px;
}
.nav-links {
  display: flex;
  list-style: none;
  gap: 28px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
}
.nav-links li a {
  color: inherit;
  transition: color 0.3s;
}
.nav-links li a:hover {
  color: var(--primary);
}
header .btn {
  padding: 8px 20px;
  font-size: 14px;
}
#themeToggle {
  background: none;
  border: none;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  padding: 4px 8px;
}
#menuToggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 28px;
  cursor: pointer;
}

/* ========== Hero ========== */
#home {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #e94560 100%);
  position: relative;
  overflow: hidden;
  padding-top: 70px;
}
#home::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(233, 69, 96, 0.15), transparent 60%),
              radial-gradient(circle at 80% 30%, rgba(15, 52, 96, 0.3), transparent 50%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
}
.hero-content h1 {
  font-size: 56px;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}
.hero-content h1 span {
  background: linear-gradient(135deg, #e94560, #ff6b81);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 22px;
  max-width: 700px;
  margin: 0 auto 32px;
  opacity: 0.9;
}
.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-buttons a {
  display: inline-block;
  padding: 16px 40px;
  font-size: 18px;
  font-weight: 600;
  border-radius: 50px;
  transition: all 0.3s;
}
.hero-buttons a.btn {
  padding: 16px 40px;
  font-size: 18px;
}
.hero-buttons a:not(.btn) {
  border: 2px solid rgba(255, 255, 255, 0.5);
  color: #fff;
}
.hero-buttons a:not(.btn):hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}
.hero-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(to top, var(--bg-light), transparent);
}

/* ========== About (企业简介) ========== */
#about .grid {
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
#about .section-title {
  text-align: left;
}
#about p {
  font-size: 18px;
  margin-bottom: 20px;
}
.about-highlight {
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  border-radius: var(--radius);
  padding: 48px;
  color: #fff;
  text-align: center;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.about-highlight svg {
  margin: 0 auto 20px;
}
.about-highlight h3 {
  font-size: 28px;
  margin-bottom: 8px;
}
.about-highlight p {
  font-size: 16px;
  opacity: 0.8;
  margin-bottom: 0;
}

/* ========== 品牌故事 ========== */
.brand-story {
  background: var(--glass);
  backdrop-filter: blur(12px);
  border-radius: var(--radius);
  margin: 0 24px;
  padding: 64px 24px;
}
.brand-story .grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.brand-story .card svg {
  margin: 0 auto 16px;
}
.brand-story .card h3 {
  font-size: 22px;
  margin-bottom: 12px;
}
.brand-story .card p {
  font-size: 15px;
  opacity: 0.9;
}

/* ========== 团队 ========== */
#team .grid {
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.team-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: #fff;
  font-weight: bold;
}
.team-card h4 {
  font-size: 18px;
  margin-bottom: 4px;
}
.team-card p {
  font-size: 14px;
  opacity: 0.7;
}
.team-card p + p {
  font-size: 13px;
  margin-top: 8px;
  opacity: 0.6;
}

/* ========== 产品 ========== */
#products {
  background: var(--glass);
}
#products .grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.product-card {
  font-size: 48px;
  margin-bottom: 16px;
}
.product-card h3 {
  font-size: 22px;
  margin-bottom: 12px;
}
.product-card p {
  font-size: 15px;
  opacity: 0.85;
}

/* ========== 产品优势 ========== */
#advantages .grid {
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.advantage-icon {
  font-size: 40px;
  margin-bottom: 12px;
}
.advantage-card h4 {
  font-size: 18px;
  margin-bottom: 8px;
}
.advantage-card p {
  font-size: 14px;
  opacity: 0.75;
}

/* ========== 数据展示 ========== */
#stats {
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  padding: 80px 0;
  color: #fff;
}
#stats .grid {
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.stat-number {
  font-size: 48px;
  font-weight: 800;
}
.stat-label {
  font-size: 18px;
  opacity: 0.8;
  margin-top: 8px;
}

/* ========== 客户案例 ========== */
#cases .grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.case-icon {
  font-size: 32px;
  margin-bottom: 12px;
}
.case-card h4 {
  font-size: 18px;
  margin-bottom: 8px;
}
.case-card p {
  font-size: 14px;
  opacity: 0.8;
}

/* ========== 合作伙伴 ========== */
#partners {
  background: var(--glass);
  padding: 64px 0;
}
#partners .grid {
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
  align-items: center;
  text-align: center;
}
.partner-item {
  padding: 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  font-size: 16px;
  font-weight: 500;
  transition: background 0.3s, transform 0.3s;
}
.partner-item:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: scale(1.05);
}

/* ========== 用户评价 ========== */
#testimonials .grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.testimonial-text {
  font-style: italic;
  margin-bottom: 16px;
  font-size: 15px;
  opacity: 0.9;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: bold;
  flex-shrink: 0;
}
.testimonial-author strong {
  font-size: 14px;
}
.testimonial-author span {
  font-size: 13px;
  opacity: 0.6;
}

/* ========== 新闻 ========== */
#news {
  background: var(--glass);
}
#news .grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.news-date {
  font-size: 14px;
  color: var(--primary);
  margin-bottom: 8px;
}
.news-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}
.news-card p {
  font-size: 15px;
  opacity: 0.8;
}

/* ========== FAQ ========== */
#faq .faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  margin-bottom: 16px;
  cursor: pointer;
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 18px;
  font-weight: 600;
}
.faq-icon {
  font-size: 24px;
  transition: transform 0.3s;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, margin-top 0.4s ease;
  margin-top: 0;
}
.faq-answer p {
  padding-top: 16px;
  font-size: 15px;
  opacity: 0.85;
}
.faq-item.active .faq-answer {
  max-height: 300px;
  margin-top: 16px;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* ========== 联系我们 ========== */
#contact {
  background: var(--glass);
}
#contact .grid {
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
#contact .section-title {
  text-align: left;
}
.contact-info {
  font-size: 18px;
  margin-bottom: 24px;
}
.contact-info div {
  margin-bottom: 16px;
}
.contact-info strong {
  font-weight: 600;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: inherit;
  font-size: 16px;
  transition: border-color 0.3s;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
}
.contact-form label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}
.contact-form .btn {
  width: 100%;
}

/* ========== 网站地图 ========== */
#sitemap {
  padding: 48px 0;
}
#sitemap .grid {
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
  font-size: 14px;
}
#sitemap h4 {
  font-size: 16px;
  margin-bottom: 12px;
}
#sitemap ul li {
  margin-bottom: 6px;
  opacity: 0.8;
  transition: opacity 0.3s;
}
#sitemap ul li:hover {
  opacity: 1;
}

/* ========== Footer ========== */
footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 48px 0 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}
.footer-links {
  display: flex;
  gap: 24px;
  font-size: 14px;
}
.footer-links a {
  color: inherit;
  transition: color 0.3s;
}
.footer-links a:hover {
  color: var(--primary);
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  opacity: 0.6;
}
.footer-bottom p {
  margin-bottom: 8px;
}

/* ========== 返回顶部 ========== */
#backToTop {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(233, 69, 96, 0.4);
  display: none;
  z-index: 999;
  transition: all 0.3s;
}
#backToTop:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(233, 69, 96, 0.6);
}

/* ========== 搜索遮罩 ========== */
#searchOverlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 2000;
  justify-content: center;
  align-items: flex-start;
  padding-top: 120px;
}
#searchOverlay.active {
  display: flex;
}
.search-box {
  max-width: 600px;
  width: 90%;
  margin: 0 auto;
}
.search-box input {
  width: 100%;
  padding: 16px 24px;
  font-size: 18px;
  border: none;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.95);
  color: #333;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}
.search-results {
  margin-top: 16px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 16px;
  padding: 16px;
  display: none;
  color: #333;
}
.search-results.show {
  display: block;
}
#closeSearch {
  display: block;
  margin: 16px auto 0;
  background: none;
  border: 2px solid rgba(255, 255, 255, 0.5);
  color: #fff;
  padding: 8px 24px;
  border-radius: 50px;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s;
}
#closeSearch:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
  #team .grid {
    grid-template-columns: repeat(2, 1fr);
  }
  #advantages .grid {
    grid-template-columns: repeat(2, 1fr);
  }
  #stats .grid {
    grid-template-columns: repeat(2, 1fr);
  }
  #partners .grid {
    grid-template-columns: repeat(3, 1fr);
  }
  #sitemap .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 768px) {
  .section {
    padding: 48px 0;
  }
  .section-title {
    font-size: 28px;
  }
  .container {
    padding: 0 16px;
  }
  header nav {
    height: 60px;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(12px);
    padding: 16px 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .nav-links.show {
    display: flex;
  }
  #menuToggle {
    display: block;
  }
  .hero-content h1 {
    font-size: 32px;
  }
  .hero-content p {
    font-size: 18px;
  }
  .hero-buttons a,
  .hero-buttons a.btn {
    padding: 12px 24px;
    font-size: 16px;
  }
  #about .grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .brand-story {
    margin: 0 16px;
    padding: 32px 16px;
  }
  .brand-story .grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  #team .grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  #products .grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  #advantages .grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  #stats .grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  #cases .grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  #partners .grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  #testimonials .grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  #news .grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  #contact .grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  #sitemap .grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-links {
    flex-wrap: wrap;
    gap: 16px;
  }
  #backToTop {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 20px;
  }
}
@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 28px;
  }
  .hero-content p {
    font-size: 16px;
  }
  .section-title {
    font-size: 24px;
  }
  #team .grid {
    grid-template-columns: 1fr;
  }
  #advantages .grid {
    grid-template-columns: 1fr;
  }
  #stats .grid {
    grid-template-columns: 1fr;
  }
  #partners .grid {
    grid-template-columns: 1fr;
  }
  #sitemap .grid {
    grid-template-columns: 1fr;
  }
  .stat-number {
    font-size: 36px;
  }
}