/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-magenta: #FF3366;
      --bg-light: #F4F6FC;
      --surface-white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-muted: #5A607F;
      --text-light: #B0C4DE;
      --text-on-dark: #FFFFFF;
      --border-light: #E2E6EF;
      --border-soft: rgba(255,255,255,0.14);
      
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-container: 16px;
      
      --shadow-card: 0 4px 20px rgba(10,14,39,0.06);
      --shadow-hover: 0 12px 32px rgba(10,14,39,0.12);
      --glow-cyan: 0 0 12px rgba(0,240,255,0.4);
      
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --transition: all 0.25s ease;
      --header-height: 64px;
      --max-width: 1280px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      line-height: 1.8;
      background-color: var(--bg-light);
      color: var(--text-dark);
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* ----- 导航 (毛玻璃动态效果) ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      z-index: 1000;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
      backdrop-filter: blur(0px);
      border-bottom: 1px solid transparent;
    }
    
    .site-header.scrolled {
      background: rgba(10, 14, 39, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    
    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      color: #FFFFFF;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 1.8rem;
    }
    
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.25s;
    }
    
    .nav-links a:hover {
      color: #FFFFFF;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.3s;
      display: block;
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--primary-deep);
        flex-direction: column;
        padding: 6rem 2rem;
        gap: 2rem;
        transition: right 0.3s;
        box-shadow: -8px 0 24px rgba(0,0,0,0.3);
        backdrop-filter: blur(12px);
        background: rgba(10,14,39,0.96);
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .logo {
        z-index: 1001;
      }
    }
    
    /* ----- 板块通用 ----- */
    section {
      padding: 80px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
    }
    
    /* ----- Hero 首屏 ----- */
    .hero {
      background: radial-gradient(circle at 30% 30%, #1A1A3E, var(--primary-deep));
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(0,240,255,0.12) 0%, transparent 70%);
      top: -100px;
      right: -100px;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      background: linear-gradient(to right, #fff, var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.2rem;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: 0.2s;
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    .btn-primary:hover {
      background: #33F5FF;
      box-shadow: 0 0 18px rgba(0,240,255,0.6);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
    }
    .hero-image {
      max-width: 450px;
      filter: drop-shadow(0 20px 30px rgba(0,240,255,0.15));
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-right {
        order: -1;
        margin-bottom: 1rem;
      }
    }
    
    /* 优势 - 非对称网格 */
    .advantages {
      background: var(--bg-light);
    }
    .adv-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 40px;
    }
    .adv-item:first-child {
      grid-row: span 2;
    }
    .adv-card {
      background: var(--surface-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .adv-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 1rem;
    }
    @media (max-width: 768px) {
      .adv-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 服务卡片瀑布流 */
    .services {
      background: var(--primary-deep);
      color: white;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: rgba(255,255,255,0.05);
      border-radius: var(--radius-card);
      overflow: hidden;
      backdrop-filter: blur(4px);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 20px 30px rgba(0,0,0,0.4);
    }
    .card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .card-tag {
      background: var(--accent-magenta);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: 12px;
      left: 12px;
    }
    .card-content {
      padding: 20px;
    }
    @media (max-width: 768px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 对比表 */
    .compare {
      background: white;
    }
    .compare-table {
      display: flex;
      gap: 24px;
      margin-top: 32px;
    }
    .compare-col {
      flex: 1;
      background: #f9fafc;
      border-radius: var(--radius-card);
      padding: 28px;
    }
    .compare-col.highlight {
      background: linear-gradient(145deg, #0A0E27, #1A1A3E);
      color: white;
      border: 2px solid var(--accent-cyan);
    }
    @media (max-width: 768px) {
      .compare-table {
        flex-direction: column;
      }
    }
    
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 32px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 18px 24px;
      border: 1px solid var(--border-light);
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    
    .cta-section {
      background: var(--primary-deep);
      text-align: center;
      padding: 80px 0;
      position: relative;
    }
    .btn-cta {
      background: var(--accent-magenta);
      color: white;
      padding: 16px 40px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1.1rem;
      transition: 0.2s;
      display: inline-block;
      margin-top: 24px;
    }
    .btn-cta:hover {
      transform: scale(1.04);
      box-shadow: 0 8px 20px rgba(255,51,102,0.5);
    }
    
    footer {
      background: #05081a;
      color: #8890A8;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }