/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --bg-base: #0B1120;
      --cyan: #00E5FF;
      --neon-purple: #A855F7;
      --text-primary: #E2E8F0;
      --text-secondary: #94A3B8;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover: rgba(255, 255, 255, 0.1);
      --card-radius: 24px;
      --btn-radius: 50px;
      --transition: 0.3s ease;
      --shadow-card: 0 12px 28px rgba(0, 0, 0, 0.5);
      --max-width: 1280px;
    }

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

    body {
      background-color: var(--bg-base);
      color: var(--text-primary);
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 空间背景叙事结构 */
    .bg-texture {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 30%, rgba(0,229,255,0.03) 0%, transparent 55%),
                  radial-gradient(circle at 80% 70%, rgba(168,85,247,0.06) 0%, transparent 60%),
                  url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 60 60"><path d="M0 0 L60 0 L60 60 L0 60 Z" fill="none" stroke="rgba(255,255,255,0.015)" stroke-width="0.5"/><circle cx="4" cy="4" r="0.8" fill="rgba(255,255,255,0.08)"/></svg>') repeat;
      pointer-events: none;
      z-index: -1;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    h1, h2, h3 {
      font-weight: 700;
      line-height: 1.15;
    }

    h1 {
      font-size: clamp(2.5rem, 8vw, 4.5rem);
      letter-spacing: -0.02em;
      background: linear-gradient(to bottom, #fff 0%, #b0c8ff 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
    }

    h2 {
      font-size: clamp(2rem, 5vw, 2.8rem);
      margin-bottom: 1rem;
      color: white;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--cyan);
      box-shadow: 0 0 12px var(--cyan);
      border-radius: 4px;
    }

    section {
      padding: 130px 0;
      position: relative;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
      .container {
        padding: 0 20px;
      }
    }

    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 0;
      background: rgba(10,14,39,0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,229,255,0.25);
      z-index: 100;
      padding: 12px 0;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: white;
      text-decoration: none;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      background: linear-gradient(135deg, var(--cyan), var(--neon-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }

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

    .nav-cta {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }

    .nav-cta:hover {
      background: rgba(0,229,255,0.15);
      box-shadow: 0 0 15px rgba(0,229,255,0.4);
      color: white;
    }

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

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(25px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 40px;
        font-size: 1.6rem;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        z-index: 99;
      }
      .mobile-menu.open {
        transform: translateX(0);
      }
    }

    /* 按钮体系 */
    .btn-primary {
      background: linear-gradient(135deg, var(--cyan), var(--neon-purple));
      color: #0A0E27;
      font-weight: 700;
      border: none;
      padding: 16px 40px;
      border-radius: var(--btn-radius);
      box-shadow: inset 0 1px 3px rgba(255,255,255,0.4), 0 0 18px rgba(0,240,255,0.35);
      text-decoration: none;
      display: inline-block;
      transition: 0.3s;
      letter-spacing: 1px;
      font-size: 1.1rem;
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(0,240,255,0.6), 0 0 48px rgba(168,85,247,0.4);
      transform: scale(1.03);
    }

    .btn-outline {
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      background: transparent;
      padding: 16px 40px;
      border-radius: 50px;
      font-weight: 600;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px) saturate(160%);
      -webkit-backdrop-filter: blur(18px) saturate(160%);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .glass-card:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: rgba(255,255,255,0.2);
      box-shadow: 0 0 25px rgba(0,240,255,0.1);
    }

    /* Hero区域 */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      min-height: 85vh;
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 36px;
      height: 420px;
      border: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 20px 40px rgba(0,0,0,0.6), 0 0 30px rgba(0,240,255,0.15);
    }

    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-image {
        height: 300px;
        order: -1;
      }
    }

    /* 非对称解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 36px;
      margin-top: 48px;
    }
    .sub-grid {
      display: grid;
      grid-template-rows: 1fr 1fr;
      gap: 36px;
    }

    @media (max-width: 768px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
      .sub-grid {
        grid-template-rows: auto auto;
      }
    }

    .data-counter {
      font-size: clamp(3.2rem, 6vw, 4rem);
      font-weight: 800;
      color: var(--cyan);
      text-shadow: 0 0 15px var(--cyan);
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
    }

    footer {
      background: rgba(10,14,39,0.7);
      backdrop-filter: blur(15px);
      padding: 40px 0.24px;
    }