/* roulang page: index */
:root {
      --deep-space: #0B0C10;
      --deep-purple: #1A1A2E;
      --nebula-purple: #6C3CE1;
      --nebula-hover: #8B5CF6;
      --cyan-accent: #00E5FF;
      --cyan-hover: #00B8D4;
      --white: #FFFFFF;
      --gray-light: #B0B0C0;
      --gray-mid: #6B6B7B;
      --card-bg: rgba(26, 26, 46, 0.8);
      --card-border: rgba(108, 60, 225, 0.25);
      --card-shadow: 0 8px 32px rgba(108, 60, 225, 0.15);
      --card-shadow-hover: 0 12px 40px rgba(108, 60, 225, 0.3);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-pill: 50px;
      --transition: 0.25s ease-in-out;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
      background: linear-gradient(180deg, var(--deep-space) 0%, var(--deep-purple) 100%);
      color: var(--gray-light);
      line-height: 1.7;
      font-size: 16px;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }

    /* ---------- 导航栏 ---------- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 12, 16, 0.7);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(108, 60, 225, 0.2);
      transition: background 0.3s ease;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: radial-gradient(circle, var(--cyan-accent) 10%, var(--nebula-purple) 90%);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--nebula-purple);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--gray-light);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-accent);
      transition: width 0.3s;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--nebula-purple), var(--nebula-hover));
      color: var(--white);
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(108, 60, 225, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--cyan-accent), var(--cyan-hover));
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.5);
      color: var(--deep-space);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan-accent);
      color: var(--cyan-accent);
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: var(--cyan-hover);
      color: var(--white);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
    }

    /* 移动端底部导航 (胶囊) */
    .mobile-bottom-nav {
      display: none;
    }

    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(11, 12, 16, 0.85);
        backdrop-filter: blur(20px);
        border-radius: 40px;
        padding: 8px 20px;
        gap: 20px;
        z-index: 1001;
        border: 1px solid rgba(108, 60, 225, 0.4);
        box-shadow: 0 8px 24px rgba(0,0,0,0.6);
      }
      .mobile-bottom-nav a {
        color: var(--gray-light);
        font-size: 1.2rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        gap: 2px;
      }
      .mobile-bottom-nav a i {
        font-size: 1.4rem;
      }
      .mobile-bottom-nav .cta-badge {
        background: var(--nebula-purple);
        border-radius: 30px;
        padding: 6px 16px;
        color: white;
        margin-top: -20px;
        box-shadow: 0 4px 12px var(--nebula-purple);
      }
      .header-inner {
        height: 64px;
      }
    }

    /* ---------- Hero ---------- */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-left {
      flex: 1 1 50%;
    }

    .hero-badges {
      display: flex;
      gap: 12px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }

    .badge {
      background: rgba(26, 26, 46, 0.8);
      border: 1px solid var(--card-border);
      border-radius: 20px;
      padding: 6px 16px;
      font-size: 0.85rem;
      color: var(--cyan-accent);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--white);
      line-height: 1.2;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .hero h1 span {
      color: var(--cyan-accent);
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--gray-light);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-visual {
      width: 100%;
      max-width: 450px;
      aspect-ratio: 1/1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      box-shadow: 0 0 40px rgba(108, 60, 225, 0.5);
      position: relative;
      overflow: hidden;
      animation: float 6s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }

    /* ---------- 数据看板 ---------- */
    .stats-board {
      display: flex;
      gap: 24px;
      margin: 40px 0 80px;
      flex-wrap: wrap;
    }

    .stat-card {
      flex: 1 1 200px;
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 24px;
      text-align: center;
      transition: var(--transition);
    }

    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--cyan-accent);
      line-height: 1;
    }

    .stat-label {
      color: var(--gray-mid);
      margin-top: 8px;
    }

    /* ---------- 核心服务矩阵 ---------- */
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 16px;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin: 40px 0;
    }

    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 28px;
      transition: all 0.3s;
      box-shadow: var(--card-shadow);
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--cyan-accent);
      box-shadow: var(--card-shadow-hover);
    }

    .service-icon {
      font-size: 2.2rem;
      color: var(--cyan-accent);
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 1.4rem;
      color: white;
      margin-bottom: 8px;
    }

    .tech-tags {
      display: flex;
      gap: 8px;
      margin-top: 16px;
      flex-wrap: wrap;
    }

    .tag {
      background: rgba(0, 229, 255, 0.1);
      border: 1px solid rgba(0, 229, 255, 0.3);
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 0.75rem;
      color: var(--cyan-accent);
    }

    /* 对比条 */
    .compare-block {
      display: flex;
      gap: 24px;
      margin: 60px 0;
      flex-wrap: wrap;
    }

    .compare-col {
      flex: 1;
      background: rgba(26,26,46,0.6);
      border-radius: var(--radius-lg);
      padding: 24px;
    }

    .compare-col.highlight {
      border: 1px solid var(--nebula-purple);
      background: rgba(108, 60, 225, 0.1);
    }

    /* FAQ */
    .faq-grid {
      display: flex;
      gap: 32px;
      margin: 40px 0;
      flex-wrap: wrap;
    }

    .faq-categories {
      flex: 0 0 180px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-cat {
      background: transparent;
      border: none;
      color: var(--gray-light);
      padding: 10px 16px;
      text-align: left;
      border-radius: 8px;
    }

    .faq-cat.active {
      background: rgba(108,60,225,0.2);
      color: white;
    }

    .faq-items {
      flex: 1;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 16px 0;
    }

    /* CTA 横幅 */
    .cta-band {
      background: radial-gradient(circle at center, rgba(108,60,225,0.2), transparent);
      text-align: center;
      padding: 80px 24px;
      border-radius: 32px;
      margin: 60px 0;
    }

    .footer {
      background: #0B0C10;
      padding: 60px 0 30px;
      color: #6B6B7B;
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }

    @media (max-width: 768px) {
      .services-grid { grid-template-columns: 1fr; }
      .footer { grid-template-columns: 1fr 1fr; }
      .hero h1 { font-size: 2.4rem; }
    }

    i { margin-right: 4px; }