/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary: #00E5A0;
      --primary-glow: rgba(0, 229, 160, 0.35);
      --primary-soft: #00FFB3;
      --bg-deep: #0A0F1F;
      --bg-card: #111827;
      --bg-glass: rgba(255, 255, 255, 0.03);
      --border-light: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 229, 160, 0.3);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.5);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', system-ui, -apple-system, sans-serif;
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
      --shadow-glow: 0 12px 40px rgba(0, 229, 160, 0.15);
      --container-max: 1280px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 15, 31, 0.78);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(10,15,31,0.78), rgba(10,15,31,0.78)), linear-gradient(90deg, transparent, var(--primary), transparent);
      background-origin: border-box;
      background-clip: padding-box, border-box;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--primary);
      filter: drop-shadow(0 0 6px var(--primary-glow));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition-smooth);
      position: relative;
    }

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

    .nav-cta {
      background: var(--primary);
      color: var(--bg-deep) !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 20px var(--primary-glow);
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
    }

    .nav-cta:hover {
      background: var(--primary-soft);
      box-shadow: 0 0 30px var(--primary-glow);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        right: -100%;
        width: 70%;
        height: calc(100vh - 72px);
        background: rgba(10,15,31,0.96);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 40px 30px;
        gap: 28px;
        transition: 0.4s ease;
        align-items: flex-start;
        border-left: 1px solid rgba(255,255,255,0.05);
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        width: 100%;
        text-align: center;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, rgba(0,229,160,0.12) 0%, transparent 60%);
    }

    .hero-bg-animation {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      pointer-events: none;
    }

    .light-orb {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.25;
      animation: float 12s infinite alternate ease-in-out;
    }
    .orb1 {
      width: 450px;
      height: 450px;
      background: rgba(0,229,160,0.2);
      top: 10%;
      right: -5%;
      animation-duration: 14s;
    }
    .orb2 {
      width: 350px;
      height: 350px;
      background: rgba(0,229,160,0.15);
      bottom: 5%;
      left: 10%;
      animation-duration: 18s;
    }

    @keyframes float {
      0% { transform: translate(0,0) scale(1); }
      100% { transform: translate(30px,-40px) scale(1.1); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 650px;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(to right, #fff, var(--primary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 2px;
      margin-bottom: 20px;
    }

    .hero p {
      color: var(--text-secondary);
      font-size: 1.15rem;
      max-width: 500px;
      margin-bottom: 32px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #0A0F1F;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 22px var(--primary-glow);
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--primary-soft);
      box-shadow: 0 0 35px var(--primary-glow);
      transform: scale(1.04);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.25);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.4rem;
      }
      .hero p {
        font-size: 1rem;
      }
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
      color: white;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 20px;
    }

    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 24px rgba(0,0,0,0.4);
      text-align: left;
    }

    .glass-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-6px);
      box-shadow: 0 14px 38px rgba(0,229,160,0.18);
    }

    .icon-circle {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 18px;
    }

    .glass-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .glass-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
      margin-bottom: 20px;
    }
    .card-link {
      color: var(--primary);
      text-decoration: none;
      font-weight: 600;
    }

    /* 数据块 */
    .data-panel {
      background: #0A0F1F;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
      padding: 50px 0;
    }
    .data-item .number {
      font-family: 'Inter', sans-serif;
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
    }
    .data-item span {
      display: block;
      color: var(--text-muted);
    }

    /* 方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .solution-card {
      background: #111827;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.05);
      transition: var(--transition-smooth);
    }
    .solution-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-5px);
    }
    .solution-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      filter: brightness(0.7);
    }
    .solution-text {
      padding: 24px;
    }

    /* 合作品牌 */
    .brand-wall {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      align-items: center;
      filter: grayscale(1);
      opacity: 0.6;
      transition: 0.3s;
    }
    .brand-wall img {
      height: 36px;
      transition: 0.3s;
    }
    .brand-wall img:hover {
      filter: grayscale(0);
      opacity: 1;
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 14px;
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-item.active {
      border-left: 3px solid var(--primary);
      background: rgba(0,229,160,0.04);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }

    /* CTA Banner */
    .cta-banner {
      background: linear-gradient(135deg, #0A0F1F 0%, #0f1a2b 100%);
      border-top: 1px solid rgba(0,229,160,0.2);
      text-align: center;
      padding: 70px 24px;
    }

    footer {
      background: #0A0F1F;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .services-grid, .data-panel, .solution-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      section {
        padding: 60px 0;
      }
    }