/* roulang page: index */
/* 全局设计变量与重置 */
    :root {
      --deep-blue: #0A1128;
      --energy-cyan: #00F0FF;
      --champion-gold: #FFD700;
      --white: #FFFFFF;
      --gray-light: #E0E6ED;
      --gray-mid: #8A94A6;
      --glass-bg: rgba(10, 17, 40, 0.6);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glass-border-hover: rgba(0, 240, 255, 0.6);
      --card-shadow: 0 20px 40px rgba(0, 240, 255, 0.15);
      --border-radius-lg: 24px;
      --border-radius-md: 16px;
      --border-radius-pill: 50px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-inter: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--deep-blue);
    }

    body {
      font-family: var(--font-inter);
      background-color: var(--deep-blue);
      color: var(--gray-light);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 背景动态线条模拟 */
    .bg-grid {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 240, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.05) 1px, transparent 1px);
      background-size: 60px 60px;
      z-index: -2;
      pointer-events: none;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 17, 40, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.1);
      transition: background var(--transition-smooth);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    .logo {
      font-family: var(--font-inter);
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.02em;
      color: var(--energy-cyan);
      text-transform: uppercase;
      font-style: italic;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--champion-gold);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--gray-light);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--energy-cyan);
      transition: width 0.3s ease;
      box-shadow: 0 0 8px var(--energy-cyan);
    }

    .nav-links a:hover {
      color: var(--energy-cyan);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-ghost-nav {
      background: transparent;
      border: 2px solid var(--energy-cyan);
      color: var(--energy-cyan);
      padding: 10px 28px;
      border-radius: var(--border-radius-pill);
      font-weight: 600;
      transition: all var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }
    .btn-ghost-nav:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.4);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--energy-cyan);
      cursor: pointer;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10, 17, 40, 0.95);
        backdrop-filter: blur(30px);
        flex-direction: column;
        justify-content: center;
        gap: 3rem;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        z-index: 999;
      }
      .nav-links.active {
        transform: translateX(0);
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .nav-links a {
        font-size: 1.8rem;
        font-weight: 600;
      }
    }

    /* 通用区块 */
    section {
      padding: 120px 0;
      position: relative;
    }

    .section-title {
      font-weight: 700;
      font-size: 2.2rem;
      color: var(--white);
      margin-bottom: 3rem;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 45px;
      height: 4px;
      background: var(--energy-cyan);
      box-shadow: 0 0 15px var(--energy-cyan);
      border-radius: 4px;
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: radial-gradient(circle at 30% 40%, rgba(0, 240, 255, 0.08) 0%, transparent 60%);
      position: relative;
    }
    .hero-content {
      max-width: 900px;
    }
    .hero h1 {
      font-weight: 800;
      font-size: clamp(3rem, 8vw, 5.5rem);
      letter-spacing: -0.03em;
      background: linear-gradient(to right, #FFFFFF, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--gray-mid);
      margin-bottom: 2.5rem;
    }
    .btn-group {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 4rem;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #007BFF);
      border: none;
      color: white;
      font-weight: 700;
      padding: 16px 42px;
      border-radius: var(--border-radius-pill);
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.5);
      transition: all 0.3s;
      text-decoration: none;
    }
    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0, 240, 255, 0.9);
      transform: scale(1.05);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--energy-cyan);
      color: var(--energy-cyan);
      padding: 16px 42px;
      border-radius: var(--border-radius-pill);
      font-weight: 600;
      transition: 0.3s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }

    /* 优势不对称网格 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr 0.9fr;
      gap: 24px;
    }
    .adv-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-md);
      padding: 2.5rem 2rem;
      transition: all var(--transition-smooth);
    }
    .adv-card:hover {
      transform: translateY(-10px);
      border-color: var(--glass-border-hover);
      box-shadow: var(--card-shadow);
    }
    .adv-icon {
      font-size: 2.5rem;
      color: var(--energy-cyan);
      margin-bottom: 1.5rem;
    }
    .adv-card h3 {
      font-weight: 700;
      font-size: 1.5rem;
      margin-bottom: 0.5rem;
      color: white;
    }

    /* 数据滚动 */
    .data-strip {
      background: #060B1A;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .data-item {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      font-style: italic;
      font-size: 3rem;
      color: var(--energy-cyan);
    }

    /* 服务Z型 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 4rem;
      margin-bottom: 5rem;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid rgba(0,240,255,0.3);
      transition: 0.3s;
    }
    .service-img img {
      width: 100%;
      display: block;
    }

    /* FAQ */
    .faq-item {
      background: rgba(10,17,40,0.5);
      backdrop-filter: blur(12px);
      border-left: 4px solid var(--energy-cyan);
      margin-bottom: 1rem;
      border-radius: 12px;
      transition: 0.2s;
    }
    .faq-question {
      padding: 1.2rem 2rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 2rem 1.5rem;
      display: none;
      color: var(--gray-mid);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 联系表单 */
    .contact-form {
      display: flex;
      gap: 1rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .contact-form input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.15);
      padding: 14px 20px;
      border-radius: 40px;
      color: white;
      outline: none;
      min-width: 220px;
    }
    .contact-form input:focus {
      border-color: var(--energy-cyan);
      box-shadow: 0 0 15px rgba(0,240,255,0.3);
    }

    footer {
      background: #060B1A;
      border-top: 2px solid var(--energy-cyan);
    }

    @media (max-width: 768px) {
      .advantage-grid, .service-row {
        grid-template-columns: 1fr;
        flex-direction: column;
      }
    }