/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --primary: #4A1D8F;
      --primary-light: #6A3FB5;
      --accent: #0FEFFD;
      --accent-dark: #0BC0D0;
      --bg: #F7F5FA;
      --surface: #FFFFFF;
      --text-primary: #1A1A2E;
      --text-secondary: #5C5C7A;
      --text-muted: #8A8AA0;
      --border-light: #E8E6F0;
      --gradient-brand: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      --gradient-hover: linear-gradient(135deg, #3A1575 0%, #0BC0D0 100%);
      --shadow-card: 0 8px 24px rgba(74, 29, 143, 0.08);
      --shadow-card-hover: 0 16px 36px rgba(74, 29, 143, 0.15);
      --shadow-button: 0 8px 24px rgba(74, 29, 143, 0.25);
      --radius-card: 20px;
      --radius-button: 60px;
      --radius-badge: 40px;
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --container-max: 1280px;
      --section-gap: 100px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 基础元素 */
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    
    /* 导航栏 - 极简高端文字导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-light);
      height: 76px;
      display: flex;
      align-items: center;
    }
    
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-size: 26px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    
    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }
    
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 0;
      position: relative;
      transition: color var(--transition);
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 24px;
    }
    
    /* 汉堡菜单 (移动端) */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 7px;
      cursor: pointer;
      padding: 10px;
      background: transparent;
      border: none;
    }
    
    .hamburger span {
      display: block;
      width: 28px;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    
    .hamburger span:last-child {
      width: 18px;
      align-self: flex-end;
    }
    
    /* 移动端全屏菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 76px;
      left: 0;
      right: 0;
      bottom: 0;
      background: var(--bg);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
      z-index: 99;
      backdrop-filter: blur(12px);
      background: rgba(247, 245, 250, 0.97);
    }
    
    .mobile-menu.active {
      display: flex;
    }
    
    .mobile-menu a {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-primary);
      transition: color var(--transition);
    }
    
    /* Hero 首屏 */
    .hero {
      padding: 140px 0 80px;
      background: var(--bg);
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    
    .hero-content h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      color: var(--text-primary);
    }
    
    .hero-content h1 .highlight {
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    .hero-content p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 500px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--gradient-brand);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 4px 14px rgba(74, 29, 143, 0.3);
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    
    .btn-primary:hover {
      background: var(--gradient-hover);
      box-shadow: var(--shadow-button);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
    }
    
    .btn-outline:hover {
      background: rgba(74, 29, 143, 0.05);
      border-color: var(--primary-light);
    }
    
    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 420px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(74,29,143,0.2) 0%, rgba(15,239,253,0.15) 100%);
      border-radius: 32px;
    }
    
    /* 通用区块样式 */
    .section {
      padding: var(--section-gap) 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    
    .section-title h2 {
      font-size: 36px;
      font-weight: 600;
      color: var(--text-primary);
      display: inline-block;
      position: relative;
    }
    
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: -12px;
      left: 50%;
      transform: translateX(-50%);
      width: 48px;
      height: 3px;
      background: var(--primary);
      border-radius: 2px;
    }
    
    /* 亮点网格 2x3 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .feature-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      position: relative;
    }
    
    .feature-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-6px);
    }
    
    .feature-icon {
      width: 52px;
      height: 52px;
      background: rgba(15, 239, 253, 0.12);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 26px;
      margin-bottom: 24px;
    }
    
    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    
    .feature-card p {
      color: var(--text-secondary);
      font-size: 16px;
      margin-bottom: 20px;
    }
    
    .badge {
      position: absolute;
      top: -12px;
      right: -12px;
      background: var(--gradient-brand);
      color: white;
      padding: 6px 16px;
      border-radius: var(--radius-badge);
      font-weight: 700;
      font-size: 16px;
      box-shadow: 0 4px 12px rgba(74,29,143,0.3);
      display: flex;
      align-items: center;
      gap: 4px;
    }
    
    /* 案例瀑布流 */
    .cases-masonry {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .case-card {
      background: var(--surface);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    
    .case-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-6px);
    }
    
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    
    .case-img::before {
      content: '查看详情';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(74,29,143,0.3), rgba(15,239,253,0.25));
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 600;
      opacity: 0;
      transition: opacity var(--transition);
      font-size: 18px;
    }
    
    .case-card:hover .case-img::before {
      opacity: 1;
    }
    
    .case-info {
      padding: 20px 24px;
    }
    
    .case-info h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    
    .case-info p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 14px;
    }
    
    .tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    
    .tag {
      border: 1px solid var(--accent);
      color: var(--accent-dark);
      font-size: 12px;
      padding: 2px 12px;
      border-radius: 20px;
      font-weight: 500;
    }
    
    /* 方案对比 */
    .plans-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .plan-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: all var(--transition);
      border: 2px solid transparent;
    }
    
    .plan-card.recommended {
      border-color: var(--accent);
      transform: scale(1.02);
      box-shadow: var(--shadow-card-hover);
    }
    
    .plan-header {
      background: var(--gradient-brand);
      color: white;
      padding: 28px 24px;
      text-align: center;
      position: relative;
    }
    
    .plan-header h3 {
      font-size: 24px;
      font-weight: 600;
    }
    
    .recommended-badge {
      position: absolute;
      top: 12px;
      right: 12px;
      background: white;
      color: var(--primary);
      padding: 4px 14px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 13px;
    }
    
    .plan-body {
      padding: 28px 24px;
    }
    
    .plan-body ul {
      list-style: none;
    }
    
    .plan-body li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px;
      color: var(--text-secondary);
    }
    
    .plan-body i.fa-check {
      color: var(--accent);
    }
    
    .plan-body i.fa-minus {
      color: #ccc;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 24px 0;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      color: var(--text-primary);
      transition: color var(--transition);
    }
    
    .faq-question i {
      color: var(--accent);
      font-size: 20px;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding-left: 16px;
      border-left: 3px solid var(--primary);
      color: var(--text-secondary);
      margin-bottom: 0;
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 24px;
    }
    
    /* CTA 横幅 */
    .cta-banner {
      background: var(--gradient-brand);
      padding: 90px 0;
      text-align: center;
    }
    
    .cta-banner h2 {
      color: white;
      font-size: 38px;
      margin-bottom: 16px;
    }
    
    .cta-banner p {
      color: rgba(255,255,255,0.9);
      margin-bottom: 32px;
      font-size: 18px;
    }
    
    .btn-white {
      background: white;
      color: var(--primary);
      padding: 14px 40px;
      border-radius: var(--radius-button);
      font-weight: 700;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    
    .btn-white:hover {
      background: rgba(255,255,255,0.9);
      box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    }
    
    /* 页脚 */
    .footer {
      background: #1A1A2E;
      color: #B0B0C0;
      padding: 70px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    
    .footer h4 {
      color: white;
      margin-bottom: 20px;
      font-size: 18px;
    }
    
    .footer a {
      color: #B0B0C0;
      transition: color var(--transition);
    }
    
    .footer a:hover {
      color: var(--accent);
    }
    
    .social-icons {
      display: flex;
      gap: 16px;
      font-size: 22px;
    }
    
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 28px;
      text-align: center;
      font-size: 15px;
    }
    
    /* 响应式 */
    @media (max-width: 1023px) {
      .hero-grid, .features-grid, .cases-masonry, .plans-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    @media (max-width: 767px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid, .features-grid, .cases-masonry, .plans-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 { font-size: 40px; }
      .footer-grid { grid-template-columns: 1fr; }
    }