/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D3557;
      --accent: #F4A261;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --gray-100: #F1F3F5;
      --gray-200: #DEE2E6;
      --gray-400: #ADB5BD;
      --gray-600: #6C757D;
      --text-dark: #1D3557;
      --text-body: #4A5568;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-lg: 0 16px 32px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: "Inter", "SF Pro Display", sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      color: var(--text-dark);
      background-color: var(--white);
      line-height: 1.6;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      font-weight: 700;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      transition: var(--transition);
      border-bottom: 1px solid transparent;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--secondary);
      text-decoration: none;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--primary);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--secondary);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
      transform: translateX(-50%);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary-nav {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(230,57,70,0.2);
    }
    .btn-primary-nav:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 5px;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--secondary);
      border-radius: 3px;
      transition: var(--transition);
    }
    @media (max-width: 992px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--secondary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        transition: 0.35s ease;
        display: flex;
        z-index: 999;
      }
      .mobile-menu.active {
        right: 0;
      }
      .mobile-menu a {
        color: white;
        font-size: 20px;
        font-weight: 600;
      }
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      position: relative;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(29,53,87,0.75) 0%, rgba(230,57,70,0.65) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: multiply;
      animation: slowZoom 20s infinite alternate;
    }
    @keyframes slowZoom {
      0% { background-size: 105%; }
      100% { background-size: 110%; }
    }
    .hero-content {
      color: white;
      max-width: 800px;
    }
    .hero h1 {
      font-size: 58px;
      font-weight: 800;
      line-height: 1.15;
      margin-bottom: 20px;
      animation: fadeUp 0.8s ease;
    }
    .hero .highlight {
      color: var(--accent);
    }
    .hero p {
      font-size: 20px;
      opacity: 0.9;
      margin-bottom: 36px;
      font-weight: 400;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      box-shadow: 0 8px 18px rgba(230,57,70,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-3px);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: white;
      color: var(--secondary);
    }
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }
    /* 非对称优势 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .feature-large {
      background: white;
      padding: 40px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border-left: 6px solid var(--primary);
      transition: var(--transition);
    }
    .feature-large:hover {
      border-left-width: 12px;
    }
    .feature-small {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .feature-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据统计 */
    .stats-band {
      background: var(--bg-light);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 56px;
      font-weight: 900;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .stat-number {
        font-size: 42px;
      }
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .service-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .service-card:hover img {
      transform: scale(1.03);
    }
    @media (max-width: 992px) {
      .services-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 600px) {
      .services-grid { grid-template-columns: 1fr; }
    }
    /* 案例横向滑动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 300px;
      background: var(--gray-100);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: var(--transition);
    }
    .case-card:hover {
      background: white;
      box-shadow: var(--shadow-md);
    }
    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text, .solution-img {
      flex: 1;
    }
    .solution-img img {
      width: 100%;
      border-radius: 16px;
      box-shadow: var(--shadow-md);
    }
    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--gray-200);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--gray-600);
    }
    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #E63946 0%, #1D3557 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .btn-shimmer {
      position: relative;
      overflow: hidden;
    }
    @keyframes shimmer {
      0% { left: -100%; }
      100% { left: 200%; }
    }
    .btn-shimmer::after {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 60%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
      animation: shimmer 3s infinite;
    }
    footer {
      background: #1D3557;
      color: white;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }