/* roulang page: index */
:root {
      --primary: #FF4D00;
      --primary-glow: rgba(255, 77, 0, 0.6);
      --secondary: #0B0C10;
      --surface: #1A1C23;
      --gray: #C0C0C0;
      --accent: #00F0FF;
      --accent-glow: rgba(0, 240, 255, 0.5);
      --white: #FFFFFF;
      --border-light: rgba(255, 77, 0, 0.15);
      --border-accent: rgba(0, 240, 255, 0.3);
      --radius: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
      --font-sans: 'Noto Sans SC', system-ui, sans-serif;
      --font-number: 'Rajdhani', 'Inter', sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--secondary);
      color: var(--gray);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--primary);
      padding: 0 20px;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      height: 70px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--gray);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 12px var(--primary-glow);
    }
    .nav-cta:hover {
      background: #FF6B2B;
      box-shadow: 0 0 18px var(--primary-glow);
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--white);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(11,12,16,0.95);
        backdrop-filter: blur(16px);
        justify-content: space-around;
        padding: 12px 8px;
        border-top: 1px solid var(--primary);
        gap: 4px;
      }
      .nav-links.mobile-active {
        display: flex;
      }
      .nav-links a {
        font-size: 0.7rem;
        flex-direction: column;
        display: flex;
        align-items: center;
        gap: 4px;
        color: var(--gray);
      }
      .nav-links a i {
        font-size: 1.2rem;
      }
      .nav-cta {
        background: transparent;
        box-shadow: none;
        padding: 6px 10px;
        color: var(--primary) !important;
      }
      .hamburger {
        display: block;
      }
    }
    /* 区块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    h2 {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    @media (max-width: 768px) {
      h2 {
        font-size: 28px;
      }
    }
    /* Hero */
    #hero {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(255,77,0,0.25) 0%, rgba(11,12,16,0.85) 70%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 56px;
      font-weight: 700;
      color: var(--white);
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-text p {
      font-size: 1.25rem;
      color: var(--gray);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 16px var(--primary-glow);
      transition: var(--transition);
    }
    .btn-primary:hover {
      background: #FF6B2B;
      box-shadow: 0 0 24px var(--primary-glow);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: var(--accent);
      color: #0B0C10;
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 400px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.7);
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 36px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .data-card {
      background: rgba(26,28,35,0.8);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--radius);
      padding: 28px 20px;
      text-align: center;
      transition: var(--transition);
    }
    .data-card:hover {
      border-color: var(--accent);
      box-shadow: 0 0 20px var(--accent-glow);
      transform: translateY(-4px);
    }
    .data-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      text-shadow: 0 0 10px var(--accent-glow);
    }
    .data-label {
      color: var(--gray);
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .data-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--surface);
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .service-card:hover {
      border-color: var(--accent);
      box-shadow: 0 0 28px rgba(0,240,255,0.25);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--white);
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--gray);
      margin-bottom: 18px;
    }
    .text-link {
      color: var(--accent);
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比区 */
    .comparison-row {
      display: flex;
      align-items: center;
      gap: 30px;
      background: var(--surface);
      border-radius: 20px;
      padding: 40px;
      border: 1px solid var(--border-light);
    }
    .compare-col {
      flex: 1;
    }
    .compare-col h3 {
      font-size: 24px;
      margin-bottom: 24px;
      color: var(--white);
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .old-item {
      color: #888;
      text-decoration: line-through;
    }
    .new-item {
      color: var(--accent);
    }
    .vs-badge {
      background: var(--primary);
      color: white;
      border-radius: 50%;
      width: 50px;
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      box-shadow: 0 0 18px var(--primary-glow);
    }
    @media (max-width: 768px) {
      .comparison-row {
        flex-direction: column;
      }
    }
    /* FAQ */
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius);
      margin-bottom: 16px;
      border: 1px solid var(--border-light);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      color: var(--white);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--gray);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 转化区 */
    .contact-wrapper {
      display: flex;
      gap: 40px;
      background: var(--surface);
      border-radius: 24px;
      padding: 50px;
      border: 1px solid var(--border-light);
    }
    .contact-form {
      flex: 2;
    }
    .form-group input, .form-group textarea {
      width: 100%;
      background: #0B0C10;
      border: 1px solid #333;
      padding: 14px;
      border-radius: 8px;
      color: white;
      margin-bottom: 20px;
      transition: var(--transition);
    }
    .form-group input:focus, .form-group textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 10px var(--primary-glow);
      outline: none;
    }
    .trust-badges {
      display: flex;
      gap: 24px;
      margin-bottom: 24px;
      color: var(--accent);
      flex-wrap: wrap;
    }
    @media (max-width: 768px) {
      .contact-wrapper {
        flex-direction: column;
        padding: 24px;
      }
    }
    footer {
      background: #0B0C10;
      padding: 40px 0;
      border-top: 1px solid rgba(255,77,0,0.3);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }