/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-red: #FF4655;
      --bg-light: #F5F7FB;
      --text-dark: #1E1E2F;
      --text-soft: #5A5A72;
      --white: #FFFFFF;
      --card-bg: #FFFFFF;
      --border-light: rgba(0, 240, 255, 0.08);
      --shadow-card: 0 8px 30px rgba(0, 240, 255, 0.08);
      --shadow-hover: 0 16px 36px rgba(0, 240, 255, 0.15);
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-btn: 14px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
      --transition: 0.25s ease;
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.15);
      z-index: 999;
      padding: 0 24px;
      transition: var(--transition);
    }

    .nav-container {
      max-width: var(--container-max);
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--white);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 2rem;
    }
    .logo span {
      background: linear-gradient(135deg, #fff 0%, #b3f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-menu {
      display: flex;
      gap: 2.5rem;
      list-style: none;
      align-items: center;
    }

    .nav-menu a {
      color: #ddd;
      font-weight: 500;
      font-size: 1rem;
      transition: 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-cyan);
      transition: 0.2s;
    }
    .nav-menu a:hover {
      color: #fff;
    }
    .nav-menu a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--accent-red);
      color: white;
      padding: 12px 28px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: 0 0 18px rgba(255, 70, 85, 0.5);
      transition: 0.25s;
      border: none;
      cursor: pointer;
    }
    .btn-nav:hover {
      background: #ff5e6b;
      box-shadow: 0 0 28px rgba(255, 70, 85, 0.7);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary);
      text-align: center;
    }
    .section-sub {
      color: var(--text-soft);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 60px;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      color: white;
      padding-top: 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,14,39,0.88) 0%, rgba(10,14,39,0.5) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin: 0 auto;
      text-align: center;
    }
    .hero h1 {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: 2px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .hero .sub {
      font-size: 1.4rem;
      opacity: 0.9;
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 16px 42px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1.15rem;
      border: none;
      box-shadow: 0 0 25px rgba(255,70,85,0.7);
      transition: 0.2s;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: #ff5f6b;
      transform: scale(1.03);
      box-shadow: 0 0 35px #ff4655cc;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 16px 38px;
      border-radius: 40px;
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
    }

    /* 数据看板 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
      margin-top: -60px;
      position: relative;
      z-index: 5;
    }
    .stat-card {
      background: white;
      border-radius: 24px;
      padding: 30px 40px;
      text-align: center;
      box-shadow: var(--shadow-card);
      min-width: 200px;
      border: 1px solid var(--border-light);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    .stat-label {
      color: var(--text-soft);
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 32px;
    }
    .feature-card {
      background: white;
      border-radius: 20px;
      padding: 32px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
      transition: all 0.25s;
      border: 1px solid transparent;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent-cyan);
    }
    .feature-icon {
      font-size: 2.4rem;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    /* 对比 */
    .comparison-wrapper {
      display: flex;
      align-items: center;
      gap: 30px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .compare-box {
      flex: 1 1 300px;
      background: white;
      border-radius: 28px;
      padding: 32px;
    }
    .vs-badge {
      background: var(--primary);
      color: white;
      border-radius: 50%;
      width: 70px;
      height: 70px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.5rem;
      border: 2px solid var(--accent-cyan);
    }
    .green-list i { color: #00E676; }
    .red-list i { color: var(--accent-red); }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 18px;
      margin-bottom: 16px;
      padding: 0 28px;
      border-left: 5px solid var(--accent-cyan);
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: #4a4a5a;
    }

    /* 表单 */
    .contact-form {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
    }
    .contact-form input {
      padding: 16px 24px;
      border-radius: 40px;
      border: 1px solid #ddd;
      flex: 2;
      min-width: 250px;
    }
    .btn-submit {
      background: var(--accent-red);
      color: white;
      border: none;
      padding: 16px 42px;
      border-radius: 40px;
      font-weight: 700;
      cursor: pointer;
    }

    footer {
      background: var(--primary);
      color: #ccc;
      padding: 60px 0 30px;
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; flex-direction: column; background: #0A0E27; position: absolute; top: 72px; left: 0; width: 100%; padding: 20px; }
      .nav-menu.active { display: flex; }
      .hamburger { display: block; }
      .hero h1 { font-size: 2.4rem; }
      .comparison-wrapper { flex-direction: column; }
    }