/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --panda-black: #1A1A1A;
      --bamboo-green: #00A86B;
      --energy-orange: #FF4F00;
      --bg-warm: #FAFAFA;
      --card-white: #FFFFFF;
      --light-gray-bg: #F0F0F0;
      --text-dark: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #888888;
      --border-light: #E5E5E5;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --max-width: 1280px;
      --header-height: 72px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-dark);
      font-weight: 700;
      letter-spacing: -0.01em;
    }

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

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

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      transition: box-shadow 0.3s ease;
    }

    .site-header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--panda-black);
      letter-spacing: -0.02em;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--bamboo-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 1.2rem;
    }

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

    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--bamboo-green);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--panda-black);
    }

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

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .menu-toggle span {
      width: 24px;
      height: 2px;
      background: var(--panda-black);
      transition: var(--transition-smooth);
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: clamp(1.8rem, 4vw, 2.5rem);
      font-weight: 700;
      color: var(--panda-black);
    }
    .section-title p {
      color: var(--text-muted);
      margin-top: 12px;
      font-size: 1.1rem;
    }

    /* Hero */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(0,0,0,0.65) 0%, rgba(0,0,0,0.3) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      padding-top: var(--header-height);
    }
    .hero-content {
      max-width: 700px;
    }
    .hero-content h1 {
      font-size: clamp(2.5rem, 6vw, 4.5rem);
      font-weight: 800;
      line-height: 1.1;
      color: white;
      margin-bottom: 24px;
      letter-spacing: -0.02em;
    }
    .hero-content p {
      font-size: 1.25rem;
      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(--bamboo-green);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 4px 14px rgba(0,168,107,0.3);
      border: none;
    }
    .btn-primary:hover {
      background: #008c52;
      transform: scale(1.03);
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
      border-color: var(--bamboo-green);
      color: white;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .pain-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      width: 48px;
      height: 48px;
      background: var(--bamboo-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.5rem;
      flex-shrink: 0;
    }
    .pain-text h3 {
      font-size: 1.25rem;
      margin-bottom: 8px;
    }
    .pain-text p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* 解决方案 */
    .solution-bg {
      background: var(--light-gray-bg);
    }
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .solution-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      border: 1px solid transparent;
    }
    .solution-card:hover {
      border-color: var(--bamboo-green);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-icon {
      width: 56px;
      height: 56px;
      background: #e6f7f1;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--bamboo-green);
      font-size: 1.8rem;
      margin-bottom: 24px;
    }
    .solution-card h3 {
      margin-bottom: 10px;
    }
    .learn-more {
      color: var(--bamboo-green);
      font-weight: 600;
      margin-top: 16px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 数据 */
    .stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--energy-orange);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
      -webkit-overflow-scrolling: touch;
    }
    .testimonial-card {
      min-width: 320px;
      max-width: 380px;
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      flex-shrink: 0;
    }
    .stars {
      color: var(--energy-orange);
      font-size: 1.2rem;
      margin-bottom: 12px;
    }
    .testimonial-text {
      font-style: italic;
      color: var(--text-body);
      margin-bottom: 20px;
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .user-info img {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      user-select: none;
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 1.5rem;
      color: var(--bamboo-green);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 24px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-dark {
      background: var(--panda-black);
      color: white;
      text-align: center;
      padding: 100px 24px;
    }
    .cta-dark h2 {
      color: white;
      font-size: 2.5rem;
      margin-bottom: 16px;
    }
    .cta-dark .btn-primary {
      background: var(--bamboo-green);
      margin-top: 32px;
    }
    .link-underline {
      color: var(--bamboo-green);
      text-decoration: underline;
      margin-left: 24px;
      font-weight: 500;
    }

    /* 页脚 */
    .site-footer {
      background: #2A2A2A;
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-weight: 800;
      font-size: 1.5rem;
      color: white;
    }
    .copyright {
      text-align: center;
      border-top: 1px solid #444;
      padding-top: 24px;
      color: #aaa;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .pain-grid, .solution-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 32px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .pain-grid, .solution-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 2.2rem;
      }
      .stats-row {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-buttons {
        flex-direction: column;
      }
    }