/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary-deep: #0D0B1E;
      --card-bg: rgba(20, 18, 40, 0.8);
      --card-border: rgba(255, 255, 255, 0.06);
      --white: #FFFFFF;
      --gray-light: #B0B0C0;
      --cyan-highlight: #00F0FF;
      --green-success: #00E676;
      --amber-warning: #FFB300;
      --purple-start: #7B2FF7;
      --pink-end: #E5007E;
      --gradient-primary: linear-gradient(135deg, #7B2FF7, #E5007E);
      --gradient-text: linear-gradient(to right, #C57BFF, #FF4D9E);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --shadow-card: 0 12px 30px rgba(123, 47, 247, 0.15);
      --shadow-hover: 0 20px 40px rgba(229, 0, 126, 0.2);
      --font-inter: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    body {
      background-color: var(--primary-deep);
      font-family: var(--font-inter);
      color: var(--gray-light);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      backdrop-filter: blur(20px);
      background: rgba(13, 11, 30, 0.88);
      border-bottom: 1px solid rgba(189, 147, 249, 0.1);
      transition: all 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 80px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-icon {
      font-size: 2.2rem;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .brand-name {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: 1px;
      background: var(--gradient-text);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      font-family: var(--font-inter);
    }
    .menu-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .menu-links a {
      color: var(--white);
      text-decoration: none;
      font-weight: 500;
      font-size: 1.05rem;
      position: relative;
      transition: color 0.2s;
    }
    .menu-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-highlight);
      transition: width 0.25s ease;
    }
    .menu-links a:hover {
      color: var(--cyan-highlight);
    }
    .menu-links a:hover::after {
      width: 100%;
    }
    .btn-cta {
      background: var(--gradient-primary);
      color: white !important;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: all 0.3s;
      border: none;
      box-shadow: 0 4px 12px rgba(123, 47, 247, 0.4);
    }
    .btn-cta:hover {
      transform: scale(1.04);
      box-shadow: 0 0 23px rgba(229, 0, 126, 0.6);
      filter: brightness(1.1);
    }
    #menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 2rem;
      color: white;
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .menu-links {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .menu-links {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: rgba(10, 8, 27, 0.98);
        backdrop-filter: blur(18px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 28px;
        display: none;
        border-bottom: 1px solid rgba(255,255,255,0.08);
      }
      #menu-toggle {
        display: block;
      }
      #menu-checkbox:checked ~ .menu-links {
        display: flex;
      }
      .nav-container {
        height: 70px;
      }
    }
      .hidden-checkbox {
        display: none;
      }
    /* hero */
    #hero {
      background: radial-gradient(circle at 30% 40%, rgba(123,47,247,0.18), transparent 50%), 
                  url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-color: #0D0B1E;
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 100px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 50px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: clamp(2.4rem, 5vw, 4.2rem);
      font-weight: 900;
      line-height: 1.25;
      background: linear-gradient(to right, #c47aff, #fb3c8c, #ff6ba0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 22px;
    }
    .hero-text .subtitle {
      font-size: 1.3rem;
      color: #e0e0f0;
      margin-bottom: 30px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }
    .btn-outline {
      border: 1.5px solid var(--cyan-highlight);
      color: var(--cyan-highlight);
      padding: 13px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      text-decoration: none;
      background: transparent;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 18px rgba(0,240,255,0.5);
      color: white;
    }
    .badge-row {
      display: flex;
      gap: 28px;
      flex-wrap: wrap;
    }
    .badge-item {
      background: rgba(20,18,40,0.75);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-sm);
      padding: 12px 18px;
      text-align: center;
      border: 1px solid var(--card-border);
    }
    .badge-item .digit {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--cyan-highlight);
    }
    .badge-item span {
      display: block;
      font-size: 0.9rem;
      color: #aaa;
    }
    .hero-image {
      background: rgba(25,20,50,0.4);
      border-radius: var(--radius-lg);
      padding: 16px;
      backdrop-filter: blur(15px);
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-image img {
      max-width: 100%;
      border-radius: 20px;
      opacity: 0.95;
    }
    @media (max-width: 900px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .badge-row {
        justify-content: center;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    section {
      padding: 110px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: 2.6rem;
      font-weight: 700;
      color: white;
      text-align: center;
      margin-bottom: 52px;
      letter-spacing: -0.3px;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 30px;
    }
    .feature-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      transition: all 0.3s;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: rgba(229,0,126,0.6);
    }
    .icon-placeholder {
      font-size: 2.6rem;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      color: transparent;
      margin-bottom: 22px;
    }
    .card-title {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--card-border);
      transition: 0.3s;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .service-info {
      padding: 15px 20px 20px;
    }
    .scenario-row {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x proximity;
    }
    .scenario-card {
      min-width: 260px;
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 22px;
      flex-shrink: 0;
      scroll-snap-align: start;
    }
    .data-numbers {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 38px;
      margin: 50px 0;
    }
    .number-block {
      text-align: center;
    }
    .big-number {
      font-size: 4rem;
      font-weight: 900;
      color: var(--cyan-highlight);
    }
    .faq-item {
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      border: 1px solid var(--card-border);
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 700;
      color: white;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--gray-light);
      padding: 0 28px;
    }
    .faq-open .faq-answer {
      max-height: 200px;
      padding-bottom: 18px;
    }
    .cta-block {
      background: radial-gradient(circle at 30% 30%, #7B2FF788, #000000);
      text-align: center;
      border-radius: var(--radius-lg);
      padding: 90px 30px;
    }
    footer {
      background: #070516;
      padding: 55px 0;
    }