/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --deep-space: #0B1A3B;
      --nebula-cyan: #00D4FF;
      --nebula-purple: #7B68EE;
      --functional-green: #00E676;
      --warning-orange: #FFAB00;
      --bg-light: #F5F7FC;
      --card-bg: #FFFFFF;
      --text-primary: #1A1F36;
      --text-secondary: #5A6480;
      --white: #FFFFFF;
      --border-glow: rgba(0,212,255,0.15);
      --shadow-card: 0 8px 32px rgba(11,26,59,0.08);
      --shadow-hover: 0 16px 48px rgba(0,212,255,0.15);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --transition: 200ms ease-in-out;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      transition: background var(--transition), backdrop-filter var(--transition);
      padding: 16px 0;
    }
    .header.scrolled {
      background: rgba(11,26,59,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      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: -0.3px;
    }
    .logo i {
      color: var(--nebula-cyan);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--nebula-cyan);
      transition: width var(--transition);
      box-shadow: 0 0 8px var(--nebula-cyan);
    }
    .nav-links a:hover {
      color: var(--nebula-cyan);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    /* Hero */
    .hero {
      background: var(--deep-space);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0,212,255,0.12) 0%, transparent 60%);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .hero h1 {
      font-size: clamp(2.4rem, 6vw, 3.4rem);
      font-weight: 700;
      color: white;
      line-height: 1.3;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      text-shadow: 0 0 30px rgba(0,212,255,0.3);
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      max-width: 680px;
      margin-bottom: 36px;
      line-height: 1.6;
      font-weight: 400;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .btn-primary {
      background: var(--nebula-cyan);
      color: var(--deep-space);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-md);
      font-size: 1rem;
      transition: all var(--transition);
      box-shadow: 0 0 20px rgba(0,212,255,0.4);
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: #33DDFF;
      box-shadow: 0 0 30px rgba(0,212,255,0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1.5px solid var(--nebula-purple);
      color: var(--nebula-purple);
      background: transparent;
      padding: 14px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: rgba(123,104,238,0.08);
      border-color: var(--nebula-cyan);
      color: var(--nebula-cyan);
    }
    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--deep-space);
      text-align: center;
    }
    .section-desc {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: rgba(11,26,59,0.75);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(0,212,255,0.2);
      border-radius: var(--radius-lg);
      padding: 32px;
      color: white;
      transition: all var(--transition);
    }
    .pain-card:hover {
      border-color: var(--nebula-cyan);
      box-shadow: 0 0 20px rgba(0,212,255,0.25);
    }
    .pain-icon {
      font-size: 2.2rem;
      color: var(--nebula-cyan);
      margin-bottom: 20px;
    }
    .pain-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
      font-weight: 600;
    }
    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      border-left: 6px solid var(--nebula-purple);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      border-left-color: var(--nebula-cyan);
    }
    .solution-img {
      height: 140px;
      background: #f0f2f8;
      border-radius: var(--radius-sm);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .solution-img img {
      object-fit: cover;
      width: 100%;
      height: 100%;
    }
    .tag {
      background: rgba(123,104,238,0.15);
      color: var(--nebula-purple);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
      margin-top: 40px;
    }
    .process-steps::before {
      content: '';
      position: absolute;
      top: 28px;
      left: 10%;
      width: 80%;
      height: 2px;
      border-top: 2px dashed var(--nebula-purple);
      z-index: 0;
    }
    .step {
      position: relative;
      z-index: 1;
      text-align: center;
      flex: 1;
    }
    .step-number {
      width: 56px;
      height: 56px;
      background: var(--nebula-cyan);
      color: var(--deep-space);
      font-weight: 700;
      font-size: 1.6rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .testimonial-card {
      background: var(--card-bg);
      padding: 36px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 4rem;
      color: var(--nebula-cyan);
      position: absolute;
      top: 10px;
      left: 20px;
      opacity: 0.3;
      line-height: 1;
    }
    /* FAQ */
    .faq-item {
      background: #F5F7FC;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      transition: all var(--transition);
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: white;
      border-left: 4px solid var(--nebula-cyan);
      margin: 0 20px 0 20px;
      border-radius: 0 8px 8px 0;
    }
    .faq-answer p {
      padding: 16px 24px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #0B1A3B 0%, #1A1F36 100%);
      text-align: center;
      padding: 100px 0;
    }
    /* 页脚 */
    .footer {
      background: var(--deep-space);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .pain-grid, .solutions-grid, .testimonial-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(11,26,59,0.95);
        backdrop-filter: blur(10px);
        justify-content: space-around;
        padding: 12px 16px;
        z-index: 99;
        border-top: 1px solid rgba(255,255,255,0.1);
      }
      .mobile-bottom-nav a {
        color: white;
        font-size: 0.8rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
      }
      .pain-grid, .solutions-grid, .testimonial-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .process-steps {
        flex-direction: column;
        align-items: center;
        gap: 30px;
      }
      .process-steps::before {
        display: none;
      }
    }