/* roulang page: index */
:root {
      --primary: #0D7B6B;
      --primary-dark: #095E52;
      --accent: #F3A83B;
      --accent-hover: #E09620;
      --bg-page: #FAFBFD;
      --bg-light: #F4F6F8;
      --card-bg: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #555555;
      --text-muted: #888888;
      --border-light: #E8ECF0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
      --radius-lg: 12px;
      --radius-sm: 8px;
      --transition: 0.25s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --section-gap: 100px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--bg-page);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, .h1, .h2, .h3 {
      font-family: var(--font-title);
      font-weight: 700;
      line-height: 1.25;
    }
    h1 {
      font-size: 42px;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
    }
    p {
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      font-family: var(--font-body);
      cursor: pointer;
      border: none;
      background: none;
      font-size: 16px;
      transition: var(--transition);
    }
    .section {
      padding: var(--section-gap) 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 60px 0;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 26px;
      }
      h3 {
        font-size: 20px;
      }
      body {
        font-size: 15px;
      }
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 68px;
      background: white;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 999;
      box-shadow: 0 1px 0 transparent;
      transition: box-shadow 0.2s ease;
    }
    .navbar.scrolled {
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease, left 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: 0.2s;
    }
    @media (max-width: 768px) {
      .navbar {
        padding: 0 20px;
      }
      .nav-links {
        position: fixed;
        top: 68px;
        left: 0;
        width: 100%;
        height: calc(100vh - 68px);
        background: white;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        box-shadow: 0 20px 30px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        transform: translateX(0);
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #FAFBFD 0%, #EEF4F2 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 68px;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 55%;
    }
    .hero-image {
      flex: 1 1 40%;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero h1 {
      margin-bottom: 20px;
      color: #0B3A33;
    }
    .hero .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 17px;
      display: inline-block;
      box-shadow: 0 4px 12px rgba(243,168,59,0.25);
      transition: all 0.2s;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 12px 20px rgba(243,168,59,0.3);
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-content {
        order: 1;
      }
      .hero-image {
        order: 0;
        max-width: 320px;
        margin: 0 auto 24px;
      }
      .hero .subtitle {
        margin-left: auto;
        margin-right: auto;
      }
    }

    /* 通用卡片样式 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    @media (max-width: 768px) {
      .grid-2, .grid-3 {
        grid-template-columns: 1fr;
      }
      .card {
        padding: 24px;
      }
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      color: #0B3A33;
      display: inline-block;
      position: relative;
    }
    .section-title h2::after {
      content: '';
      display: block;
      width: 48px;
      height: 3px;
      background: var(--primary);
      margin: 12px auto 0;
      border-radius: 4px;
    }

    /* 痛点区非对称 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 28px;
    }
    .pain-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      border-left: 4px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }
    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案交错 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 60px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .solution-text {
      flex: 1;
    }
    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }

    /* 成果数据 */
    .stats-band {
      background: var(--bg-light);
      border-radius: var(--radius-lg);
      padding: 48px 32px;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-number {
      font-size: 44px;
      font-weight: 700;
      color: var(--accent);
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 16px;
    }

    /* 证言 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .testimonial-card::before {
      content: "“";
      font-size: 64px;
      color: var(--accent);
      position: absolute;
      top: 10px;
      left: 20px;
      opacity: 0.3;
      font-family: serif;
      line-height: 1;
    }
    .testimonial-text {
      font-style: italic;
      margin-bottom: 16px;
      padding-left: 24px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      color: var(--text-main);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 24px;
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-band {
      background: var(--primary);
      border-radius: var(--radius-lg);
      padding: 60px 40px;
      text-align: center;
      color: white;
    }
    .cta-band h2 {
      color: white;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      margin-top: 20px;
      display: inline-block;
    }

    /* 页脚 */
    .footer {
      background: #1A2B28;
      color: #CCD6D4;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a {
      color: #CCD6D4;
      transition: color 0.2s;
    }
    .footer a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }