/* roulang page: index */
:root {
      --primary: #0E8C6A;
      --primary-dark: #0A6E54;
      --accent: #E8B44F;
      --green: #00B578;
      --orange: #FF9F0A;
      --red: #FA5151;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --bg-page: #F5F6FA;
      --bg-white: #FFFFFF;
      --border-light: #EEEEEE;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-capsule: 20px;
      --shadow-card: 0 4px 16px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
      --shadow-nav: 0 2px 8px rgba(0,0,0,0.04);
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--bg-page);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: 16px;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }

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

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

    button, .btn {
      border: none;
      cursor: pointer;
      font-family: inherit;
      transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* ---------- 导航 ---------- */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--bg-white);
      box-shadow: var(--shadow-nav);
      transition: box-shadow 0.2s;
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-weight: 700;
    }

    .logo-text {
      font-size: 24px;
      color: var(--primary);
      letter-spacing: 1px;
    }

    .logo-domain {
      font-size: 12px;
      color: var(--text-secondary);
      font-weight: 400;
      margin-left: 4px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 0;
      position: relative;
      transition: color 0.15s;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.15s ease-out;
    }

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

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 8px 20px;
      border-radius: var(--radius-capsule);
      font-weight: 600;
      font-size: 14px;
    }

    .nav-cta:hover {
      background: var(--primary-dark);
      box-shadow: 0 4px 12px rgba(14,140,106,0.3);
    }

    .hamburger {
      display: none;
      background: none;
      font-size: 24px;
      color: var(--text-primary);
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        z-index: 40;
      }

      .nav-links.active {
        display: flex;
      }

      .hamburger {
        display: block;
      }
    }

    /* ---------- 通用板块 ---------- */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    .text-center {
      text-align: center;
    }

    /* ---------- Hero ---------- */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      padding: 80px 0;
      background: linear-gradient(135deg, #f9fdfb 0%, #ffffff 100%);
      position: relative;
      overflow: hidden;
      min-height: 80vh;
    }

    .hero-content {
      flex: 1;
      max-width: 560px;
    }

    .hero h1 {
      font-size: 44px;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.2;
      margin-bottom: 24px;
    }

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

    .hero p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.6;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-capsule);
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(14,140,106,0.2);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 18px rgba(14,140,106,0.35);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-capsule);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(14,140,106,0.06);
    }

    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
    }

    .hero-image img {
      border-radius: 16px;
      box-shadow: var(--shadow-card);
      max-width: 500px;
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
        padding: 60px 0;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-image img {
        max-width: 300px;
      }
    }

    /* ---------- 痛点卡片 ---------- */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      display: flex;
      align-items: flex-start;
      gap: 18px;
      box-shadow: var(--shadow-card);
      transition: transform 0.2s, box-shadow 0.2s;
    }

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

    .pain-icon {
      font-size: 28px;
      color: var(--accent);
    }

    .pain-text h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 6px;
    }

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

    /* ---------- 解决方案 ---------- */
    .solution-block {
      display: flex;
      align-items: center;
      gap: 48px;
    }

    .solution-text {
      flex: 1;
    }

    .solution-text ul {
      margin-top: 16px;
      list-style: none;
      padding-left: 0;
    }

    .solution-text li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 16px;
    }

    .solution-text i {
      color: var(--primary);
    }

    .solution-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
    }

    @media (max-width: 768px) {
      .solution-block {
        flex-direction: column;
      }
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }

    /* 优势卡片 */
    .advantage-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: all 0.2s;
    }

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

    .advantage-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 18px;
      transition: transform 0.2s;
    }

    .advantage-card:hover .advantage-icon {
      transform: scale(1.05);
    }

    /* 数据区域 */
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 64px;
      flex-wrap: wrap;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }

    .stat-label {
      font-size: 16px;
      color: var(--text-secondary);
    }

    /* 证言卡片 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: center;
      box-shadow: var(--shadow-card);
    }

    .avatar-placeholder {
      width: 56px;
      height: 56px;
      background: #e0f0eb;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 16px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
      padding: 0 24px;
      color: var(--text-secondary);
      font-size: 14px;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
      border-radius: 24px;
      margin: 60px 0;
    }

    .cta-section h2 {
      font-size: 32px;
      margin-bottom: 24px;
    }

    .btn-accent {
      background: var(--accent);
      color: #1F2329;
      padding: 16px 40px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 18px;
    }

    .btn-accent:hover {
      background: #f5c96a;
    }

    /* Footer */
    .footer {
      background: #1F2329;
      color: #86909C;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer a {
      color: #86909C;
    }

    .footer a:hover {
      color: white;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        gap: 40px;
      }
    }