/* 基础设置 */
:root {
  --primary: #0066cc;
  --primary-dark: #0052a3;
  --primary-light: #e6f2ff;
  --bg: #ffffff;
  --bg-gray: #f8fafc;
  --text: #1a1a2e;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --container: 1200px;
  --radius: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

/* 跳过链接 */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
  background: var(--primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: 6px;
  z-index: 9999;
}

/* 头部 */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

.logo {
  height: 36px;
  width: auto;
}

.site-header .brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-name {
  font-weight: 600;
  font-size: 17px;
  white-space: nowrap;
  letter-spacing: -0.02em;
}

.top-nav ul {
  display: flex;
  gap: 8px;
  list-style: none;
}

.top-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.top-nav a:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.header-cta {
  display: flex;
  gap: 10px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  padding: 0 20px;
  border-radius: 8px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background: var(--primary-light);
  color: var(--primary);
  border-color: transparent;
}

.btn-secondary:hover {
  background: #cce5ff;
}

.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text-secondary);
}

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

/* 区块通用 */
.section {
  padding: 80px 0;
}

.section:nth-child(even) {
  background: var(--bg-gray);
}

.section-header {
  margin-bottom: 32px;
}

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

.section-header h2 {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 16px;
}

.section-cta {
  margin-top: 32px;
  text-align: center;
}

.section-cta .btn {
  height: 52px;
  padding: 0 28px;
  font-size: 16px;
  font-weight: 600;
}

.bullet {
  padding-left: 20px;
  margin: 12px 0;
}

.bullet li {
  margin: 8px 0;
  line-height: 1.8;
}

.tip {
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
  margin-top: 24px;
}

.tip a {
  color: var(--primary);
}

/* 首屏 */
.hero {
  background: linear-gradient(135deg, #f0f7ff 0%, #e8f4ff 50%, #fff 100%);
  padding: 100px 0 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-size: 42px;
  line-height: 1.2;
  margin: 0 0 16px;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h2 {
  font-size: 22px;
  font-weight: 500;
  color: var(--text-secondary);
  margin: 0 0 12px;
}

.subtitle {
  font-size: 16px;
  color: var(--text-muted);
  margin: 0 0 20px;
}

.policy-note {
  background: linear-gradient(135deg, #f0f7ff 0%, #e6f2ff 100%);
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}

.policy-note strong {
  color: var(--primary-dark);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.hero-right {
  display: none;
}

/* 科普区 */
.why {
  background: var(--bg);
}

.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.why-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.why-content .section-header h2 {
  font-size: 28px;
}

.cards-grid.three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 24px 0;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.3s ease;
}

.card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--primary-dark);
}

.card p {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0;
}

.why-text {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.why-text p {
  margin: 12px 0;
  color: var(--text-secondary);
}

.why-text strong {
  color: var(--text);
}

.why-text a {
  color: var(--primary);
  font-weight: 500;
}

/* 优势区 */
.advantages {
  background: var(--bg-gray);
}

.advantages .section-header h2 {
  font-size: 28px;
}

.adv-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.grid-3x3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.adv-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  transition: all 0.3s ease;
}

.adv-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.adv-ic {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary-light) 0%, #cce5ff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 700;
}

.adv-item h3 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
}

.adv-item p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 报告示例 */
.rep-col {
  display: flex;
  justify-content: center;
}

.report-single {
  margin: 0;
  text-align: center;
}

.report-single img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  max-height: 520px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.report-single figcaption {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 14px;
}

/* 参数区 */
.specs {
  background: var(--bg);
}

.spec-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  align-items: start;
}

.spec-media {
  position: sticky;
  top: 96px;
  text-align: center;
}

.spec-media img {
  width: 100%;
  max-width: 280px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  margin: 0 auto;
}

.spec-img-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 12px;
}

.spec-content h2 {
  font-size: 28px;
  margin-bottom: 20px;
}

.spec-list {
  margin: 0 0 20px;
  padding-left: 0;
  list-style: none;
  background: var(--bg-gray);
  padding: 16px 20px;
  border-radius: var(--radius);
}

.spec-list li {
  margin: 8px 0;
  color: var(--text-secondary);
}

.spec-actions {
  margin-bottom: 24px;
}

.spec-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 20px 0 12px;
  color: var(--text);
}

/* 品牌实力 */
.brand {
  /* background: var(--bg-gray); */
}

.brand-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.brand-text h2 {
  font-size: 28px;
  margin-bottom: 16px;
}

.brand-text p {
  color: var(--text-secondary);
  margin: 12px 0;
}

.brand-text ul {
  margin: 16px 0;
}

.brand-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.brand-gallery img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
}

.brand-gallery img:hover {
  transform: scale(1.02);
}

/* 政策信息 */
.policy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.policy-media img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.policy-content .section-header h2 {
  font-size: 24px;
}

/* CTA 区 */
.cta {
  background: linear-gradient(135deg, #0066cc 0%, #0052a3 100%);
  color: #fff;
  padding: 80px 0;
}

.cta-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.cta-text h2 {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 12px;
}

.cta .section-subtitle {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

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

.cta .btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
}

.cta .btn-secondary {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}

.cta .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.25);
}

.contacts {
  margin-top: 24px;
}

.contacts p {
  margin: 8px 0;
  color: rgba(255, 255, 255, 0.9);
}

.contacts a[href^="tel:"] {
  color: #fff;
  font-weight: 600;
  font-size: 18px;
}

.cta .btn-outline {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

.cta .btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.qr {
  margin-top: 32px;
}

.qr img {
  width: 140px;
  height: 140px;
  border-radius: var(--radius);
  margin: 0 auto;
  background: #fff;
  padding: 8px;
}

/* 页脚 */
.site-footer {
  background: #1a1a2e;
  color: rgba(255, 255, 255, 0.7);
  padding: 24px 0;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.9);
}

.site-footer a:hover {
  color: #fff;
}

.site-footer .container {
  text-align: center;
  font-size: 13px;
  line-height: 2;
}

/* 侧边浮动按钮 */
.side-buttons {
  position: fixed;
  right: 20px;
  bottom: 100px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.side-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  color: var(--text-secondary);
}

.side-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.side-btn svg {
  width: 22px;
  height: 22px;
  margin-bottom: 2px;
}

.side-btn span {
  font-size: 11px;
  font-weight: 500;
}

.side-consult {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-color: transparent;
  color: #fff;
}

.side-consult:hover {
  color: #fff;
  transform: translateY(-2px) scale(1.02);
}

.side-top {
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
}

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

.side-top:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* 响应式 */
@media (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .hero h1 {
    font-size: 36px;
  }
  
  .hero h2 {
    font-size: 20px;
  }
  
  .section-header h2 {
    font-size: 26px;
  }
  
  .spec-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .spec-media {
    position: static;
    order: -1;
  }
  
  .spec-media img {
    max-width: 260px;
  }
  
  .cards-grid.three {
    grid-template-columns: 1fr;
  }
  
  .grid-3x3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .brand-gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
    gap: 12px;
  }
  
  .top-nav {
    display: none;
  }
  
  .brand-name {
    font-size: 14px;
  }
  
  .section {
    padding: 48px 0;
  }
  
  .hero {
    padding: 80px 0 60px;
  }
  
  .hero h1 {
    font-size: 28px;
  }
  
  .hero h2 {
    font-size: 18px;
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .spec-media img {
    max-width: 220px;
  }
  
  .spec-content h2 {
    font-size: 24px;
  }
  
  .section-header h2 {
    font-size: 22px;
  }
  
  .grid-3x3 {
    grid-template-columns: 1fr;
  }
  
  .cta-text h2 {
    font-size: 24px;
  }
  
  .cta-actions {
    flex-direction: column;
  }
  
  .cta-actions .btn {
    width: 100%;
  }
  
  .policy-note {
    font-size: 13px;
    padding: 14px 16px;
  }
}

@media (max-width: 480px) {
  .header-cta .btn-outline {
    display: none;
  }
  
  .btn {
    height: 44px;
    padding: 0 18px;
  }
  
  .side-buttons {
    right: 12px;
    bottom: 80px;
  }
  
  .side-btn {
    width: 50px;
    height: 50px;
    border-radius: 12px;
  }
  
  .side-btn svg {
    width: 20px;
    height: 20px;
  }
  
  .side-btn span {
    font-size: 10px;
  }
}