/* roulang page: index */
:root {
      --primary: #1A1A1A;
      --accent: #D4AF37;
      --accent-hover: #C29A2B;
      --bg: #FAFAFA;
      --text: #2D2D2D;
      --text-secondary: #6B6B6B;
      --card-bg: #FFFFFF;
      --light-gray: #F5F5F5;
      --border-light: #E0E0E0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-pill: 20px;
      --font-zh: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-en: "Inter", "SF Pro Display", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-zh);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      color: var(--primary);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      background: white;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      height: 72px;
      display: flex;
      align-items: center;
      z-index: 50;
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      width: 20px;
      height: 20px;
      background: var(--accent);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--primary);
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-box {
      background: var(--light-gray);
      border-radius: var(--radius-pill);
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      width: 160px;
      transition: width 0.3s ease;
      border: 1px solid transparent;
    }
    .search-box:focus-within {
      width: 220px;
      border-color: var(--accent);
      background: white;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      width: 100%;
      font-size: 14px;
    }
    .search-icon {
      color: var(--text-secondary);
      font-size: 16px;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(26,26,26,0.05);
      border-color: var(--primary);
    }
    .text-link {
      color: var(--accent);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }
    .text-link::after {
      content: '→';
      transition: transform 0.2s;
    }
    .text-link:hover {
      gap: 8px;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.2s;
    }
    /* 区块通用 */
    section {
      padding: 130px 0;
    }
    .section-title {
      font-size: 36px;
      line-height: 1.3;
      letter-spacing: -0.3px;
      margin-bottom: 20px;
      font-weight: 600;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 640px;
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: var(--bg);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 80px;
      width: 100%;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
    }
    .hero-text p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .hero-visual {
      flex: 1;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .abstract-geo {
      width: 300px;
      height: 300px;
      border: 2px solid rgba(212,175,55,0.3);
      border-radius: 50%;
      position: relative;
      background: radial-gradient(circle at 30% 30%, rgba(212,175,55,0.05), transparent 70%);
    }
    .abstract-geo::before {
      content: '';
      position: absolute;
      top: 20%;
      left: 20%;
      width: 60%;
      height: 60%;
      border: 1px dashed var(--accent);
      border-radius: 50%;
      opacity: 0.5;
    }
    /* 痛点区块 */
    .pain-grid {
      display: flex;
      flex-direction: column;
      gap: 24px;
      max-width: 800px;
    }
    .pain-item {
      display: flex;
      align-items: flex-start;
      gap: 20px;
      padding: 20px 0;
      border-left: 3px solid var(--border-light);
      padding-left: 24px;
      transition: border-color 0.3s, padding-left 0.3s;
      background: transparent;
    }
    .pain-item:hover {
      border-left-color: var(--accent);
      padding-left: 32px;
    }
    .pain-number {
      font-size: 48px;
      font-weight: 700;
      color: rgba(0,0,0,0.04);
      line-height: 1;
      min-width: 50px;
    }
    .pain-text h3 {
      font-size: 20px;
      margin-bottom: 8px;
    }
    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .solution-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .solution-desc {
      flex: 1;
    }
    .solution-desc h3 {
      font-size: 24px;
      margin-bottom: 16px;
    }
    .solution-desc ul {
      list-style: none;
      margin-top: 20px;
    }
    .solution-desc li {
      margin-bottom: 10px;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .solution-desc li::before {
      content: '—';
      color: var(--accent);
      font-weight: bold;
    }
    /* 成果卡片 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      display: inline-block;
      position: relative;
    }
    .metric-number::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--accent);
      transition: width 0.3s;
    }
    .metric-card:hover .metric-number::after {
      width: 100%;
    }
    .metric-label {
      font-size: 16px;
      color: var(--text-secondary);
      margin-top: 12px;
    }
    /* 证言 */
    .testimonials {
      display: flex;
      gap: 24px;
    }
    .testimonial-card {
      background: var(--light-gray);
      padding: 32px;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--accent);
      flex: 1;
    }
    .testimonial-quote {
      font-style: italic;
      font-size: 18px;
      margin-bottom: 20px;
      position: relative;
    }
    .testimonial-quote::before {
      content: '“';
      font-size: 48px;
      color: var(--accent);
      position: absolute;
      left: -16px;
      top: -16px;
      opacity: 0.4;
    }
    .testimonial-author {
      font-weight: 600;
      color: var(--primary);
    }
    .testimonial-role {
      color: var(--text-secondary);
      font-size: 14px;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      padding: 20px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }
    .faq-answer p {
      padding-bottom: 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    .faq-icon {
      font-size: 24px;
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* CTA 区块 */
    .cta-section {
      background: rgba(212,175,55,0.05);
      text-align: center;
    }
    .cta-form {
      max-width: 480px;
      margin: 32px auto 0;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .cta-form input {
      height: 48px;
      border: 1px solid var(--border-light);
      border-radius: 4px;
      padding: 0 16px;
      font-size: 16px;
      background: white;
      transition: 0.2s;
    }
    .cta-form input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(212,175,55,0.15);
      outline: none;
    }
    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #B0B0B0;
      padding: 80px 0 40px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }
    .footer-desc {
      margin-top: 12px;
      max-width: 260px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 10px;
      color: #B0B0B0;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .social-icons {
      display: flex;
      gap: 16px;
      font-size: 20px;
    }
    .copyright {
      margin-top: 40px;
      text-align: center;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      font-size: 14px;
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero-content {
        flex-direction: column;
        gap: 40px;
      }
      .metrics-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .solution-row {
        flex-direction: column;
      }
      .solution-row.reverse {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
      .hero-text h1 {
        font-size: 36px;
      }
      .section-title {
        font-size: 28px;
      }
      .testimonials {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .search-box {
        display: none;
      }
    }
    @media (max-width: 520px) {
      .hero-actions {
        flex-direction: column;
        align-items: stretch;
      }
      .btn-primary, .btn-outline {
        width: 100%;
        text-align: center;
      }
    }