/* 全局重置与变量定义 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --primary: #E6212A;
  --primary-dark: #C41820;
  --secondary: #165DFF;
  --dark: #1D2129;
  --gray-1: #4E5969;
  --gray-2: #C9CDD4;
  --gray-3: #F2F3F5;
  --white: #FFFFFF;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 30px rgba(230,33,42,0.15);
  --radius: 12px;
  --transition: all 0.3s ease;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--gray-1);
  line-height: 1.6;
  background: var(--white);
  overflow-x: hidden;
}
a {
  text-decoration: none;
  color: inherit;
}
ul, ol {
  list-style: none;
}
img {
  max-width: 100%;
  display: block;
}

/* 通用组件 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 8px;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 16px;
}
.btn-primary {
  background: var(--primary);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(230,33,42,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
}
.section {
  padding: 80px 0;
}
.section-title {
  text-align: center;
  font-size: 2.2rem;
  color: var(--dark);
  font-weight: 700;
  margin-bottom: 16px;
}
.section-subtitle {
  text-align: center;
  color: var(--gray-1);
  max-width: 700px;
  margin: 0 auto 48px;
  font-size: 1.1rem;
}
.title-divider {
  width: 60px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
  margin: 0 auto 48px;
}
.placeholder-img {
  background: var(--gray-3);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-2);
  min-height: 240px;
  font-size: 14px;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  padding: 20px 0;
  transition: var(--transition);
}
.navbar.scrolled {
  background: var(--white);
  padding: 12px 0;
  box-shadow: var(--shadow);
}
.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  transition: var(--transition);
}
.logo span {
  color: var(--primary);
}
.navbar.scrolled .logo {
  color: var(--dark);
}
.nav__menu {
  display: flex;
  gap: 36px;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav__link {
  color: rgba(255,255,255,0.9);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
.navbar.scrolled .nav__link {
  color: var(--gray-1);
}
.nav__link.active,
.nav__link:hover {
  color: var(--primary);
}
.nav__link.nav__cta {
  background: var(--primary);
  color: var(--white);
  padding: 8px 20px;
  border-radius: 6px;
}
.nav__link.nav__cta:hover {
  background: var(--primary-dark);
  color: var(--white);
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  z-index: 1001;
  background: transparent;
  border: none;
  padding: 4px;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
}
.navbar.scrolled .hamburger span {
  background: var(--dark);
}

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background: var(--white);
  z-index: 1000;
  padding: 80px 30px;
  transition: var(--transition);
  box-shadow: -4px 0 20px rgba(0,0,0,0.1);
}
.mobile-menu.active {
  right: 0;
}
.mobile-menu ul {
  display: flex;
  flex-direction: column;
  gap: 24px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.mobile-menu .nav__link {
  color: var(--dark);
  font-size: 1.1rem;
}
.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(0,0,0,0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
.menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* 首屏三图轮播 */
.carousel {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}
.carousel-item {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
}
.carousel-item.active {
  opacity: 1;
}
.carousel-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  font-size: 1.2rem;
}
.carousel-item:nth-child(1) .carousel-placeholder {
  background: linear-gradient(135deg, rgba(230,33,42,0.85), rgba(150,15,22,0.9)), 
              repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(255,255,255,0.05) 40px, rgba(255,255,255,0.05) 41px);
}
.carousel-item:nth-child(2) .carousel-placeholder {
  background: linear-gradient(135deg, rgba(22,93,255,0.85), rgba(12,52,150,0.9)), 
              repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(255,255,255,0.05) 40px, rgba(255,255,255,0.05) 41px);
}
.carousel-item:nth-child(3) .carousel-placeholder {
  background: linear-gradient(135deg, rgba(29,33,41,0.9), rgba(15,18,24,0.95)), 
              repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(255,255,255,0.05) 40px, rgba(255,255,255,0.05) 41px);
}
.carousel-caption {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  padding: 0 20px;
  padding-top: 80px;
}
.carousel-caption h2 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}
.carousel-caption p {
  font-size: 1.2rem;
  margin-bottom: 32px;
  opacity: 0.9;
  max-width: 700px;
}
.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  border: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.carousel-btn:hover {
  background: var(--primary);
}
.carousel-btn.prev { left: 30px; }
.carousel-btn.next { right: 30px; }
.carousel-indicators {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 10;
}
.indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
}
.indicator.active {
  background: var(--primary);
  width: 30px;
  border-radius: 6px;
}

/* 应用场景板块 */
.scenario-section {
  padding: 80px 0;
  background: var(--gray-3);
}
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}
.scenario-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 30px 24px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow);
}
.scenario-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.scenario-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}
.scenario-card h3 {
  font-size: 1.2rem;
  color: var(--dark);
  margin-bottom: 10px;
}
.scenario-card p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--gray-1);
}

/* Hero区 */
.hero {
  padding: 80px 0;
  background: linear-gradient(135deg, rgba(230,33,42,0.92), rgba(150,15,22,0.95)), 
              repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(255,255,255,0.05) 40px, rgba(255,255,255,0.05) 41px),
              repeating-linear-gradient(90deg, transparent, transparent 40px, rgba(255,255,255,0.05) 40px, rgba(255,255,255,0.05) 41px);
  color: var(--white);
}
.hero__content {
  max-width: 1200px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 50px;
  align-items: center;
}
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}
.hero__visual {
  animation: float 4s ease-in-out infinite;
}
.hero__visual .placeholder-img {
  background: rgba(255,255,255,0.15);
  min-height: 340px;
  color: rgba(255,255,255,0.6);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}
.hero__title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
}
.hero__subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 20px;
  line-height: 1.8;
}
.hero__desc {
  font-size: 1rem;
  line-height: 1.9;
  opacity: 0.85;
  margin-bottom: 32px;
}
.hero__btns {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.hero .btn-outline {
  color: var(--white);
  border-color: var(--white);
}
.hero .btn-outline:hover {
  background: var(--white);
  color: var(--primary);
}

/* 核心业务板块 */
.business-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}
.business-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}
.business-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}
.card-icon {
  width: 80px;
  height: 80px;
  background: rgba(230,33,42,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 24px;
  color: var(--primary);
}
.card-title {
  font-size: 1.4rem;
  color: var(--dark);
  margin-bottom: 16px;
  font-weight: 600;
}
.card-desc {
  color: var(--gray-1);
  line-height: 1.8;
}

/* 数据统计栏 */
.stats {
  background: var(--dark);
  padding: 60px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  text-align: center;
}
.stat-item .num {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}
.stat-item .label {
  color: var(--white);
  font-size: 1.1rem;
  opacity: 0.8;
}

/* 通用内容网格 */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.content-text h3 {
  font-size: 2rem;
  color: var(--dark);
  margin-bottom: 20px;
}
.content-text p {
  margin-bottom: 16px;
  line-height: 1.8;
}
.feature-list {
  margin: 24px 0;
}
.feature-list li {
  padding: 8px 0;
  padding-left: 28px;
  position: relative;
}
.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 8px;
  width: 20px;
  height: 20px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

/* 页脚 */
.footer {
  background: #0F1218;
  padding: 60px 0 20px;
  color: rgba(255,255,255,0.7);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 {
  color: var(--white);
  font-size: 1.1rem;
  margin-bottom: 20px;
}
.footer-col p {
  line-height: 1.8;
  margin-bottom: 16px;
}
.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-col ul li {
  margin-bottom: 12px;
  transition: var(--transition);
}
.footer-col ul li:hover {
  color: var(--primary);
  padding-left: 4px;
}
.footer-links-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}
.quick-links, .term-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.quick-links a, .term-links a {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  transition: var(--transition);
}
.quick-links a:hover, .term-links a:hover {
  color: var(--primary);
}
.copyright {
  text-align: center;
  font-size: 14px;
  line-height: 1.8;
}
.copyright .domain {
  color: var(--primary);
  font-weight: 500;
}

/* 回到顶部按钮 */
.back-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 99;
  border: none;
  font-size: 18px;
}
.back-top.show {
  opacity: 1;
  visibility: visible;
}
.back-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
}

/* 页面通用Banner */
.page-banner {
  padding: 160px 0 80px;
  background: linear-gradient(135deg, rgba(230,33,42,0.92), rgba(150,15,22,0.95));
  color: var(--white);
  text-align: center;
}
.page-banner h1 {
  font-size: 2.8rem;
  margin-bottom: 12px;
}
.page-banner p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* 面包屑导航 */
.breadcrumb-wrap {
  background: var(--gray-3);
  padding: 14px 0;
  margin-top: 70px;
}
.breadcrumb {
  font-size: 14px;
  color: var(--gray-1);
}
.breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}
.breadcrumb li {
  display: flex;
  align-items: center;
}
.breadcrumb a {
  color: var(--gray-1);
  transition: var(--transition);
}
.breadcrumb a:hover {
  color: var(--primary);
}
.breadcrumb .sep {
  margin: 0 10px;
  color: var(--gray-2);
}
.breadcrumb .current {
  color: var(--primary);
}

/* 关于页-时间轴 */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--gray-3);
  transform: translateX(-50%);
}
.timeline-item {
  position: relative;
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: 1fr 60px 1fr;
}
.timeline-dot {
  width: 16px;
  height: 16px;
  background: var(--primary);
  border-radius: 50%;
  position: absolute;
  left: 50%;
  top: 8px;
  transform: translateX(-50%);
  border: 4px solid var(--white);
  box-shadow: 0 0 0 2px var(--primary);
}
.timeline-year {
  text-align: right;
  padding-right: 40px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
}
.timeline-content {
  padding-left: 40px;
}
.timeline-content h3 {
  font-size: 1.1rem;
  color: var(--dark);
  margin-bottom: 8px;
}

/* 手环产品页 */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}
.product-card {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  background: var(--white);
}
.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}
.product-img {
  height: 240px;
}
.product-info {
  padding: 24px;
}
.product-name {
  font-size: 1.3rem;
  color: var(--dark);
  margin-bottom: 12px;
}
.product-desc {
  margin-bottom: 20px;
  line-height: 1.7;
}
.product-params {
  padding: 16px;
  background: var(--gray-3);
  border-radius: 8px;
  font-size: 14px;
}
.param-item {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
}

/* 媒体数据页 */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}
.service-card {
  padding: 30px;
  border-radius: var(--radius);
  border: 1px solid var(--gray-3);
  transition: var(--transition);
}
.service-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}
.case-wall {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.case-item {
  aspect-ratio: 3/2;
  background: var(--gray-3);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-2);
  font-size: 14px;
  transition: var(--transition);
}
.case-item:hover {
  background: rgba(230,33,42,0.1);
  color: var(--primary);
}

/* FAQ页面 */
.faq-section {
  padding: 60px 0;
}
.faq-list {
  max-width: 900px;
  margin: 0 auto;
}
.faq-item {
  border: 1px solid var(--gray-2);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: var(--primary);
}
.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(230,33,42,0.1);
}
.faq-title {
  padding: 20px 24px;
  background: var(--white);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  color: var(--dark);
  font-size: 1.05rem;
}
.faq-title::after {
  content: "+";
  font-size: 1.5rem;
  color: var(--primary);
  transition: var(--transition);
}
.faq-item.active .faq-title::after {
  transform: rotate(45deg);
}
.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: var(--gray-3);
}
.faq-content-inner {
  padding: 0 24px 20px;
  line-height: 1.8;
  color: var(--gray-1);
}
.terms-block {
  max-width: 900px;
  margin: 0 auto;
}
.term-section {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
  scroll-margin-top: 100px;
}
.term-section h3 {
  font-size: 1.5rem;
  color: var(--dark);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary);
}
.term-section h4 {
  font-size: 1.1rem;
  color: var(--dark);
  margin: 20px 0 12px;
}
.term-section p {
  margin-bottom: 12px;
  line-height: 1.9;
}
.term-section ul {
  padding-left: 24px;
  margin-bottom: 16px;
  list-style-type: disc;
}
.term-section ul li {
  padding: 4px 0;
  line-height: 1.8;
}
.feedback-tip {
  background: rgba(230,33,42,0.08);
  border-left: 4px solid var(--primary);
  padding: 20px;
  border-radius: 8px;
  margin-top: 20px;
}

/* CTA区块 */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  padding: 60px 0;
  text-align: center;
  color: var(--white);
}
.cta-section h3 {
  font-size: 2rem;
  margin-bottom: 16px;
}
.cta-section p {
  margin-bottom: 30px;
  opacity: 0.9;
}
.cta-section .btn {
  background: var(--white);
  color: var(--primary);
}
.cta-section .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

/* 内链样式 */
.internal-link {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px dashed rgba(230,33,42,0.3);
  transition: var(--transition);
}
.internal-link:hover {
  border-bottom-style: solid;
}

/* 响应式适配 */
@media (max-width: 992px) {
  .content-grid, .hero__content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero__title {
    font-size: 2.5rem;
  }
  .hero__visual {
    max-width: 500px;
    margin: 0 auto;
    order: -1;
  }
  .timeline::before {
    left: 20px;
  }
  .timeline-item {
    grid-template-columns: 40px 1fr;
  }
  .timeline-dot {
    left: 20px;
  }
  .timeline-year {
    text-align: left;
    padding-right: 0;
    padding-left: 40px;
    grid-column: 2/3;
    margin-bottom: 8px;
  }
  .timeline-content {
    padding-left: 40px;
    grid-column: 2/3;
  }
  .carousel-caption h2 {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .nav__menu {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .hero__title, .carousel-caption h2 {
    font-size: 2rem;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .section {
    padding: 50px 0;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .hero__btns {
    flex-direction: column;
  }
  .btn {
    width: 100%;
    text-align: center;
  }
  .page-banner h1 {
    font-size: 2rem;
  }
  .stat-item .num {
    font-size: 2.2rem;
  }
  .footer-links-bar {
    flex-direction: column;
    text-align: center;
  }
  .carousel-caption p {
    font-size: 1rem;
  }
  .carousel-btn {
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
  }
  .carousel-btn.prev { left: 15px; }
  .carousel-btn.next { right: 15px; }
  .scenario-section {
    padding: 50px 0;
  }
  .carousel {
    height: 80vh;
  }
}