/* roulang page: index */
:root {
      --color-deep: #0A0E27;
      --color-deep-gradient: #141A3A;
      --color-red: #FF4655;
      --color-red-hover: #D93A47;
      --color-cyan: #00E5FF;
      --color-cyan-glow: rgba(0,229,255,0.6);
      --bg-light: #F4F6F9;
      --bg-card: #FFFFFF;
      --bg-testimonial: #EDF0F5;
      --text-primary: #1A1C2E;
      --text-secondary: #5A6070;
      --text-light: #B0B8D0;
      --text-white: #FFFFFF;
      --border-radius-card: 16px;
      --shadow-card: 0 4px 20px rgba(10,14,39,0.08);
      --shadow-card-hover: 0 8px 32px rgba(10,14,39,0.15);
      --transition-base: 0.25s ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Orbitron', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --container-max: 1280px;
      --nav-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.75;
      color: var(--text-primary);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      transition: var(--transition-base);
      border: none;
      outline: none;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }
    
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    
    /* 导航 */
    header.nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10,14,39,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }
    
    .logo {
      font-family: 'Orbitron', var(--font-heading);
      font-weight: 700;
      font-size: 24px;
      color: var(--text-white);
      letter-spacing: 1px;
    }
    .logo span {
      color: var(--color-cyan);
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-links a {
      color: var(--text-white);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-cyan);
      transition: width 0.25s ease;
    }
    
    .nav-links a:hover {
      color: var(--color-cyan);
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .btn-primary-nav {
      background: var(--color-red);
      color: white;
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      transition: background 0.25s, box-shadow 0.25s;
      white-space: nowrap;
    }
    
    .btn-primary-nav:hover {
      background: var(--color-red-hover);
      box-shadow: 0 0 16px rgba(255,70,85,0.5);
    }
    
    .hamburger {
      display: none;
      background: none;
      color: white;
      font-size: 26px;
      border: none;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.98);
        backdrop-filter: blur(16px);
        padding: 24px 0;
        gap: 20px;
        text-align: center;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .btn-primary-nav {
        display: inline-block;
        width: auto;
      }
    }
    
    /* Hero */
    #hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, rgba(10,14,39,0.75) 0%, rgba(20,26,58,0.8) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    
    .hero-content {
      max-width: 700px;
    }
    
    .hero-content h1 {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Orbitron', sans-serif;
      font-weight: 900;
      font-size: 48px;
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: 1px;
    }
    
    .hero-content .subtitle {
      font-size: 20px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 40px;
      line-height: 1.6;
    }
    
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--color-red);
      color: white;
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 17px;
      transition: background 0.25s, box-shadow 0.25s;
    }
    
    .btn-primary:hover {
      background: var(--color-red-hover);
      box-shadow: 0 0 20px rgba(255,70,85,0.6);
    }
    
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--color-cyan);
      color: var(--color-cyan);
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 17px;
      transition: all 0.25s;
    }
    
    .btn-secondary:hover {
      background: var(--color-cyan);
      color: var(--color-deep);
    }
    
    @media (max-width: 768px) {
      .hero-content h1 {
        font-size: 36px;
      }
      .hero-buttons .btn-primary, .hero-buttons .btn-secondary {
        width: 100%;
        text-align: center;
      }
    }
    
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    
    .section-title {
      font-family: var(--font-heading);
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--color-deep);
      text-align: center;
    }
    
    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 650px;
      margin: 0 auto 60px;
    }
    
    /* 痛点网格 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    
    .pain-card {
      background: var(--bg-card);
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 24px;
      align-items: flex-start;
      transition: var(--transition-base);
    }
    
    .pain-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    
    .pain-icon {
      font-size: 48px;
      color: var(--color-cyan);
    }
    
    .pain-text h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    
    .pain-text p {
      color: var(--text-secondary);
      font-size: 15px;
    }
    
    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    
    .solution-card {
      background: var(--bg-card);
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      text-align: center;
    }
    
    .solution-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    
    .solution-icon {
      width: 64px;
      height: 64px;
      background: var(--color-red);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: white;
      font-size: 28px;
    }
    
    .solution-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    
    .solution-list {
      list-style: none;
      text-align: left;
      color: var(--text-primary);
    }
    
    .solution-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 15px;
    }
    
    .solution-list i {
      color: var(--color-cyan);
    }
    
    /* 成果数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    
    .stat-item .stat-number {
      font-family: var(--font-mono);
      font-size: 56px;
      font-weight: 900;
      color: var(--color-cyan);
      text-shadow: 0 0 12px var(--color-cyan-glow);
      line-height: 1.1;
    }
    
    .stat-label {
      font-size: 15px;
      color: var(--text-secondary);
      margin-top: 8px;
    }
    
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    
    .testimonial-card {
      background: var(--bg-testimonial);
      border-radius: var(--border-radius-card);
      padding: 32px;
      display: flex;
      gap: 24px;
      align-items: center;
    }
    
    .testimonial-avatar {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: #ccc;
      flex-shrink: 0;
    }
    
    .testimonial-content q {
      font-style: italic;
      font-size: 18px;
      display: block;
      margin-bottom: 12px;
    }
    
    .testimonial-author {
      font-weight: 600;
      font-size: 16px;
    }
    
    .testimonial-role {
      font-size: 14px;
      color: var(--text-secondary);
    }
    
    /* CTA 区块 */
    .cta-block {
      background: linear-gradient(135deg, #0A0E27 0%, #141A3A 100%);
      padding: 80px 0;
      text-align: center;
    }
    
    .cta-block h2 {
      color: white;
      font-size: 36px;
    }
    
    .cta-block p {
      color: rgba(255,255,255,0.8);
      margin: 20px 0 32px;
    }
    
    .btn-cta-large {
      background: var(--color-red);
      color: white;
      padding: 18px 48px;
      font-size: 18px;
      border-radius: 50px;
      font-weight: 700;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-bottom: 1px solid #ddd;
      padding: 20px 0;
    }
    
    .faq-question {
      width: 100%;
      background: none;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--color-deep);
      padding: 8px 0;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 10px;
    }
    
    /* 页脚 */
    footer {
      background: var(--color-deep);
      color: var(--text-light);
      padding: 60px 0 20px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    
    .footer-logo {
      font-family: 'Orbitron', sans-serif;
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    
    .footer-links a, .footer-contact p {
      display: block;
      margin-bottom: 8px;
      color: var(--text-light);
    }
    
    .social-icons i {
      font-size: 22px;
      margin-right: 16px;
      color: var(--text-light);
    }
    
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }
    
    @media (max-width: 1024px) {
      .solution-grid, .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 768px) {
      .pain-grid, .testimonial-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .solution-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
    }