/* roulang page: index */
:root {
      --primary: #0AEFFF;
      --primary-dark: #00B8D4;
      --secondary: #0A1628;
      --accent: #FF6B35;
      --light-bg: #F5F7FB;
      --dark-card: #1E2D3D;
      --white: #FFFFFF;
      --body-text: #334455;
      --muted-text: #8899AA;
      --border-light: rgba(10, 239, 255, 0.15);
      --shadow-card: 0 4px 20px rgba(10, 22, 40, 0.06);
      --shadow-hover: 0 12px 32px rgba(10, 22, 40, 0.12);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
      --transition: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      color: var(--body-text);
      background-color: var(--white);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-family: var(--font-sans);
      color: #0A1628;
      margin-top: 0;
    }

    h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: 0.02em;
      color: var(--white);
    }

    h2 {
      font-size: 2.2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }

    .section-title-light h2::after {
      background: var(--primary);
    }

    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      line-height: 1.4;
      color: #0A1628;
    }

    .text-accent {
      color: var(--accent);
      font-weight: 700;
    }

    .bg-deep {
      background-color: var(--secondary);
      color: var(--white);
    }

    .bg-deep h2, .bg-deep h3, .bg-deep p {
      color: var(--white);
    }

    .bg-light {
      background-color: var(--light-bg);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 */
    #header {
      background: rgba(10, 22, 40, 0.88);
      backdrop-filter: blur(12px);
      padding: 0.85rem 0;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      border-bottom: 1px solid rgba(10, 239, 255, 0.15);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: 1px;
    }

    .logo i {
      font-size: 2rem;
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      list-style: none;
      margin: 0;
    }

    .nav-links a {
      color: var(--white);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition);
      padding-bottom: 6px;
      border-bottom: 2px solid transparent;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }

    .mobile-menu-icon {
      display: none;
      font-size: 1.8rem;
      color: var(--white);
      cursor: pointer;
    }

    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(10, 22, 40, 0.96);
      backdrop-filter: blur(20px);
      position: absolute;
      top: 70px;
      left: 0;
      width: 100%;
      padding: 1.5rem 2rem;
      gap: 1.2rem;
      border-top: 1px solid var(--primary);
    }

    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
      text-decoration: none;
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    /* Hero */
    #hero {
      background: radial-gradient(circle at 80% 30%, rgba(10,239,255,0.1) 0%, #0A1628 70%);
      padding: 8rem 0 5rem;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #CCDDEe;
      margin-bottom: 2.5rem;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #0AEFFF 0%, #00B8D4 100%);
      color: #0A1628;
      font-weight: 700;
      padding: 0.9rem 2.2rem;
      border-radius: 50px;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
      border: none;
      box-shadow: 0 8px 24px rgba(10,239,255,0.35);
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 12px 28px rgba(10,239,255,0.5);
      color: #0A1628;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 0.9rem 2.2rem;
      border-radius: 50px;
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: rgba(10,239,255,0.1);
      color: white;
      border-color: white;
    }

    .hero-image {
      flex: 1;
      text-align: right;
    }

    .hero-image img {
      max-width: 100%;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }

    .stats-row {
      display: flex;
      justify-content: space-between;
      margin-top: 4rem;
      border-top: 1px solid rgba(255,255,255,0.2);
      padding-top: 2rem;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 2.3rem;
      font-weight: 800;
      color: var(--accent);
      font-family: var(--font-mono);
    }

    .stat-label {
      color: #aaa;
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    /* cards */
    .feature-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      gap: 1.5rem;
      align-items: flex-start;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-5px);
    }

    .feature-icon {
      font-size: 2.5rem;
      color: var(--primary);
      min-width: 50px;
    }

    .scenario-block {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 5rem;
    }

    .scenario-img img {
      border-radius: 20px;
      width: 100%;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-content {
      padding: 1.5rem;
    }

    .tag {
      background: rgba(10,239,255,0.15);
      color: #0A1628;
      font-weight: 600;
      font-size: 0.8rem;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 0.8rem;
    }

    .counter-box {
      text-align: center;
      padding: 2rem 0;
    }

    .counter-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      font-family: var(--font-mono);
    }

    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      background: white;
      border-radius: 12px;
      padding: 1rem 1.5rem;
      border: 1px solid #e0e8f0;
      margin-bottom: 0.5rem;
      cursor: pointer;
      transition: 0.3s;
    }

    .accordion-title:hover {
      background: #f0f6ff;
    }

    .cta-section {
      background: var(--secondary);
      padding: 5rem 0;
      text-align: center;
    }

    .footer {
      background: #0A1628;
      color: #B0C4DE;
      padding: 4rem 0 1.5rem;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 2.4rem; }
      .hero-grid { flex-direction: column; }
      .stats-row { flex-wrap: wrap; gap: 1.5rem; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-icon { display: block; }
      .hero-text h1 { font-size: 2rem; }
      .feature-card { flex-direction: column; }
      .scenario-block { flex-direction: column; }
      .footer .grid-x { flex-direction: column; }
    }