/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D3557;
      --accent: #F4A261;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --text-main: #1D3557;
      --text-body: #6C757D;
      --border-light: #e9ecef;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-badge: 50%;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --font-stack: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --container-max: 1200px;
      --section-gap: 80px;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      scroll-behavior: smooth;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, .data-number {
      color: var(--text-main);
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }

    /* 导航 */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      width: 28px;
    }
    .hamburger span {
      height: 2px;
      background: var(--secondary);
      transition: all 0.3s;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: var(--secondary);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 40px;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        color: white;
        font-size: 20px;
      }
      .hamburger {
        display: flex;
      }
      .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
      }
      .hamburger.active span:nth-child(2) {
        opacity: 0;
      }
      .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
      }
    }

    /* Hero */
    #hero {
      min-height: 90vh;
      background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
      display: flex;
      align-items: center;
      padding-top: 72px;
      position: relative;
      overflow: hidden;
    }
    #hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: white;
      margin-bottom: 20px;
    }
    .hero-text p {
      font-size: 18px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 18px;
      transition: all 0.2s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 18px;
      transition: all 0.2s;
      cursor: pointer;
    }
    .btn-secondary:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-badges {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 20px;
      align-items: flex-end;
    }
    .badge-card {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(12px);
      border-radius: 60px;
      padding: 18px 28px;
      color: white;
      display: flex;
      align-items: center;
      gap: 15px;
      border: 1px solid var(--accent);
      animation: float 3s infinite alternate ease-in-out;
    }
    .badge-card:nth-child(2) { animation-delay: 0.3s; }
    .badge-card:nth-child(3) { animation-delay: 0.6s; }
    .badge-number {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent);
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      100% { transform: translateY(-8px); }
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 32px;
      }
      .hero-badges {
        align-items: center;
      }
    }

    /* Section 通用 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 12px;
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--primary);
      margin: 12px auto 0;
    }

    /* 核心优势 */
    #features {
      background: var(--white);
    }
    .features-grid {
      display: flex;
      gap: 24px;
      margin-top: 48px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .feature-card {
      background: var(--bg-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      flex: 1 1 280px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(230,57,70,0.1);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 28px;
    }
    .feature-card h3 {
      margin-bottom: 12px;
    }

    /* 数据看板 */
    #data {
      background: var(--bg-light);
    }
    .data-grid {
      display: flex;
      gap: 24px;
      margin-top: 40px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .data-card {
      background: var(--white);
      flex: 1 1 200px;
      padding: 28px 16px;
      text-align: center;
      border-radius: var(--radius-card);
      border-bottom: 4px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .data-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--primary);
    }

    /* 服务矩阵 */
    #services {
      background: var(--white);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }
    .service-card {
      background: var(--bg-light);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .service-card:hover img {
      transform: scale(1.03);
    }
    .service-content {
      padding: 24px;
    }
    @media (max-width: 992px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 576px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比 */
    #comparison {
      background: var(--bg-light);
    }
    .compare-wrapper {
      display: flex;
      gap: 20px;
      margin-top: 40px;
      align-items: stretch;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-col.left {
      background: #f1f3f5;
    }
    .compare-col.right {
      background: rgba(230,57,70,0.05);
      border: 1px solid var(--primary);
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .compare-wrapper {
        flex-direction: column;
      }
    }

    /* FAQ */
    #faq {
      background: var(--white);
    }
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      padding: 20px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }

    /* CTA */
    #contact {
      background: var(--secondary);
      position: relative;
      overflow: hidden;
      color: white;
    }
    #contact::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      opacity: 0.3;
    }
    .cta-inner {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
      flex-wrap: wrap;
    }
    .cta-form {
      display: flex;
      gap: 12px;
    }
    .cta-form input {
      padding: 14px 18px;
      border-radius: var(--radius-btn);
      border: none;
      outline: none;
      transition: box-shadow 0.2s;
    }
    .cta-form input:focus {
      box-shadow: 0 0 0 3px var(--accent);
    }
    .btn-accent {
      background: var(--accent);
      color: var(--secondary);
      font-weight: 700;
      border: none;
      cursor: pointer;
    }

    /* Footer */
    #footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 14px;
      color: rgba(255,255,255,0.5);
    }