/* roulang page: index */
:root {
      --primary: #1A5F4A;
      --primary-light: #2A7A5F;
      --accent: #E8751A;
      --accent-hover: #D06816;
      --sand: #F5F0E8;
      --grey-green: #E8EDE9;
      --text-dark: #1E2A2B;
      --text-muted: #5A6A6B;
      --border-light: #DDE3E0;
      --white: #FFFFFF;
      --shadow-sm: 0 2px 16px rgba(30,42,43,0.06);
      --shadow-hover: 0 8px 24px rgba(30,42,43,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --container-max: 1200px;
      --nav-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
    }
    .nav-links a {
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: border-color 0.2s;
    }
    .nav-links a:hover {
      border-bottom-color: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      background: none;
      border: none;
      gap: 5px;
    }
    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--text-dark);
      border-radius: 2px;
      transition: 0.2s;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 8px 16px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }

    /* 通用板块间距 */
    section {
      padding: 120px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }

    h2 {
      font-size: 36px;
      font-weight: 600;
      line-height: 1.3;
      text-align: center;
      margin-bottom: 20px;
      color: var(--text-dark);
    }
    @media (max-width: 768px) {
      h2 {
        font-size: 28px;
      }
    }

    /* 按钮 */
    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      display: inline-block;
      box-shadow: 0 2px 8px rgba(232,117,26,0.3);
      transition: background 0.2s ease, box-shadow 0.2s ease;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 14px rgba(232,117,26,0.4);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      display: inline-block;
      transition: all 0.2s ease;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--text-dark);
    }
    .hero-left p {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-right img {
      border-radius: 16px;
      box-shadow: 0 12px 28px rgba(0,0,0,0.08);
      width: 100%;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-left h1 {
        font-size: 32px;
      }
      .hero-right {
        margin-top: 32px;
      }
    }

    /* 卡片网格 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 48px;
    }
    @media (max-width: 1024px) {
      .cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }

    .card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
      transform: translateY(-2px);
    }
    .card-icon {
      font-size: 28px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .card h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .card p {
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 痛点卡片特殊样式 */
    .pain-card {
      background: var(--sand);
      border: none;
      box-shadow: none;
      border-radius: config. radius-card;
    }
    .pain-card:hover {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }

    /* 深色数据区 */
    .dark-stats {
      background: var(--primary);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      text-align: center;
      gap: 40px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
      .stat-number {
        font-size: 36px;
      }
    }

    /* 流程步骤 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-top: 48px;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-number {
      font-size: 48px;
      font-weight: 700;
      color: rgba(26,95,74,0.15);
    }
    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 40px;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      margin-top: 8px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }

    /* footer */
    .footer {
      background: #1E2A2B;
      color: #DDE3E0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .footer-bottom {
      border-top: 1px solid #3A4647;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
    }