/* roulang page: index */
/* 设计令牌与全局重置 */
    :root {
      --primary: #4E6EF2;
      --primary-hover: #3A5BE0;
      --primary-light: rgba(78, 110, 242, 0.08);
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --bg: #F5F6FA;
      --surface: #FFFFFF;
      --dark-bg: #1F2329;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --border-light: #F0F1F5;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-full: 50px;
      --shadow-card: 0 2px 12px 0 rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px 0 rgba(0,0,0,0.08);
      --transition: 200ms ease-out;
      --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
      --max-width: 1200px;
      --gutter: 24px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-system);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 var(--gutter);
    }

    /* 导航栏 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: var(--surface);
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      stroke: var(--primary);
      stroke-width: 2;
      fill: none;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }

    .nav-link:hover,
    .nav-link:focus-visible {
      color: var(--primary);
      outline: none;
    }

    .nav-link:hover::after,
    .nav-link:focus-visible::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 4px;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      height: calc(100vh - 64px);
      background: var(--surface);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 99;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-link {
      font-size: 18px;
      font-weight: 500;
      color: var(--text-primary);
      transition: color var(--transition);
    }

    .mobile-link:hover {
      color: var(--primary);
    }

    /* 通用区块 */
    .section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-primary);
      margin-bottom: 24px;
      text-align: center;
    }

    /* 按钮组件 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 16px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: var(--shadow-hover);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .btn-capsule {
      border-radius: var(--radius-full);
    }

    .btn-large {
      padding: 16px 40px;
      font-size: 18px;
    }

    /* 首屏 Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      margin-top: 64px;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(78,110,242,0.08) 0%, rgba(255,255,255,0.95) 100%);
    }

    .hero-content {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-text {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .hero h1 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-primary);
    }

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

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
    }

    .hero-pain {
      font-size: 14px;
      color: var(--text-secondary);
      border-left: 3px solid var(--primary);
      padding-left: 16px;
    }

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

    .hero-image img {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-hover);
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .pain-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
      box-shadow: var(--shadow-card);
      transition: box-shadow var(--transition), transform var(--transition);
    }

    .pain-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .pain-icon {
      width: 32px;
      height: 32px;
      stroke: var(--primary);
      stroke-width: 2;
      fill: none;
      flex-shrink: 0;
    }

    .pain-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .pain-desc {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    /* 解决方案步骤 */
    .steps-container {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0;
      flex-wrap: wrap;
      margin-top: 40px;
    }

    .step-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      position: relative;
      flex: 1;
      min-width: 260px;
      max-width: 320px;
    }

    .step-number {
      font-size: 48px;
      font-weight: 700;
      color: rgba(78,110,242,0.15);
      position: absolute;
      top: 16px;
      left: 20px;
      line-height: 1;
    }

    .step-title {
      font-size: 20px;
      font-weight: 700;
      margin: 16px 0 12px;
      position: relative;
    }

    .step-desc {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 20px;
    }

    .step-progress {
      height: 4px;
      background: var(--primary);
      width: 100%;
      border-radius: 2px;
    }

    .step-connector {
      display: flex;
      align-items: center;
      color: var(--text-secondary);
      font-size: 24px;
      padding: 0 8px;
      display: none; /* 桌面端用虚线替代 */
    }

    @media (min-width: 1025px) {
      .steps-container {
        gap: 0;
      }
      .step-connector {
        display: block;
        width: 40px;
        border-top: 2px dashed var(--border-light);
        margin: 0 4px;
      }
    }

    /* 数据成果深色区 */
    .results {
      background: var(--dark-bg);
      padding: 80px 0;
      text-align: center;
    }

    .results-grid {
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .result-item {
      color: white;
    }

    .result-number {
      font-size: 48px;
      font-weight: 700;
      color: white;
      margin-bottom: 8px;
    }

    .result-label {
      font-size: 14px;
      color: #C9CDD4;
    }

    /* 证言非对称布局 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
      margin-top: 40px;
    }

    .testimonial-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #e0e5ff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .stars {
      color: var(--primary);
      letter-spacing: 2px;
    }

    .testimonial-text {
      font-size: 16px;
      line-height: 1.6;
    }

    .short-testimonial .testimonial-text {
      font-size: 14px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 20px 0;
      font-size: 18px;
      font-weight: 700;
      background: none;
      border: none;
      text-align: left;
      cursor: pointer;
      color: var(--text-primary);
    }

    .faq-q {
      color: rgba(78,110,242,0.5);
      font-size: 36px;
      margin-right: 12px;
    }

    .faq-icon {
      font-size: 24px;
      transition: transform var(--transition);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 150ms ease-out;
      padding: 0 0 0 48px;
    }

    .faq-answer p {
      font-size: 14px;
      line-height: 1.6;
      color: var(--text-secondary);
      padding-bottom: 20px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA 终极转化 */
    .cta-section {
      background: linear-gradient(135deg, #4E6EF2 0%, #6B8AFF 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    .cta-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .cta-sub {
      font-size: 16px;
      margin-bottom: 32px;
      opacity: 0.9;
    }

    .btn-cta-reverse {
      background: white;
      color: var(--primary);
      border-radius: var(--radius-full);
      padding: 16px 48px;
      font-size: 18px;
      font-weight: 700;
      transition: all var(--transition);
    }

    .btn-cta-reverse:hover {
      background: var(--primary-hover);
      color: white;
    }

    .cta-disclaimer {
      font-size: 12px;
      opacity: 0.7;
      margin-top: 16px;
    }

    /* 页脚 */
    .footer {
      background: var(--dark-bg);
      color: #C9CDD4;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }

    .footer-desc {
      font-size: 14px;
      color: var(--text-secondary);
    }

    .footer-title {
      font-size: 14px;
      font-weight: 600;
      color: white;
      margin-bottom: 16px;
    }

    .footer-link {
      display: block;
      color: #86909C;
      font-size: 14px;
      margin-bottom: 8px;
      transition: color var(--transition);
    }

    .footer-link:hover {
      color: white;
    }

    .social-icons {
      display: flex;
      gap: 16px;
    }

    .social-icon {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      border: 1.5px solid #86909C;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #86909C;
      transition: all var(--transition);
    }

    .social-icon:hover {
      background: var(--primary);
      border-color: var(--primary);
      color: white;
    }

    .footer-bottom {
      border-top: 1px solid #2E3238;
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 12px;
      color: #86909C;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-image {
        order: -1;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 24px;
      }
      .pain-grid {
        grid-template-columns: 1fr;
      }
      .steps-container {
        flex-direction: column;
        gap: 24px;
      }
      .step-connector {
        display: none;
      }
      .results-grid {
        gap: 32px;
      }
      .result-number {
        font-size: 36px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-title {
        font-size: 24px;
      }
    }