/* roulang page: index */
:root {
      --primary: #1A2B4C;
      --accent: #C8A96E;
      --accent-hover: #B8944F;
      --bg: #F7F8FA;
      --card-bg: #FFFFFF;
      --dark-bg: #0F1A2E;
      --text-heading: #0B1420;
      --text-body: #2D3748;
      --text-muted: #718096;
      --text-light: #A0AEC0;
      --border-light: #E2E8F0;
      --link-blue: #2B6CB0;
      --success: #2F855A;
      --alert: #C53030;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --radius-tag: 20px;
      --shadow-card: 0 8px 30px rgba(26, 43, 76, 0.08);
      --shadow-nav: 0 2px 20px rgba(0,0,0,0.04);
      --transition: 0.25s ease;
      --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-en: "Inter", "SF Pro Display", system-ui, sans-serif;
      --container-max: 1280px;
      --section-gap: 120px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: var(--font-cn);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
    }

    body {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    ::selection {
      background: rgba(200, 169, 110, 0.25);
      color: var(--primary);
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      box-shadow: var(--shadow-nav);
      backdrop-filter: blur(6px);
      background: rgba(255,255,255,0.92);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--primary);
      font-family: var(--font-en);
    }

    .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;
      position: relative;
      overflow: hidden;
    }

    .logo-icon::after {
      content: "";
      position: absolute;
      width: 12px;
      height: 12px;
      background: var(--accent);
      border-radius: 2px;
      bottom: 4px;
      right: 4px;
    }

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

    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: #4A5568;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: all var(--transition);
    }

    .nav-link:hover {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 1rem;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
      cursor: pointer;
      border: none;
      letter-spacing: 0.3px;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--accent);
      color: #0B1420;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(200, 169, 110, 0.25);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .btn-large {
      padding: 18px 44px;
      font-size: 1.15rem;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: #FFFFFF;
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      z-index: 99;
      overflow-y: auto;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu .nav-link {
      font-size: 1.2rem;
      border-bottom: none;
      padding: 12px 0;
    }

    /* Hero */
    .hero {
      padding: 80px 0 100px;
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .tag {
      display: inline-block;
      background: rgba(200, 169, 110, 0.12);
      color: var(--accent);
      font-weight: 600;
      font-size: 0.85rem;
      padding: 6px 16px;
      border-radius: var(--radius-tag);
      letter-spacing: 0.4px;
      width: fit-content;
    }

    h1 {
      font-size: clamp(2.5rem, 5vw, 3.8rem);
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-heading);
      letter-spacing: -0.02em;
    }

    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 480px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 8px;
    }

    .hero-right {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      background: var(--primary);
      height: 420px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-bg-img {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.7;
    }

    .overlay-geo {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,43,76,0.8) 0%, rgba(15,26,46,0.6) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .geo-pattern {
      font-size: 5rem;
      color: rgba(200,169,110,0.25);
      font-weight: 700;
      letter-spacing: 4px;
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    h2 {
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 12px;
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      max-width: 600px;
      margin: 0 auto;
    }

    /* 痛点解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      margin-top: 40px;
    }

    .pain-item, .solution-item {
      padding: 20px 24px;
      border-left: 3px solid var(--border-light);
      transition: border-color var(--transition);
    }

    .pain-item:hover, .solution-item:hover {
      border-left-color: var(--accent);
    }

    .item-icon {
      font-size: 2rem;
      margin-bottom: 12px;
      color: var(--primary);
    }

    h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-heading);
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: 0 4px 14px rgba(0,0,0,0.03);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-img {
      height: 200px;
      background: #e9edf2;
      overflow: hidden;
    }

    .card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .card-content {
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      flex: 1;
    }

    .card-content h3 {
      font-size: 1.35rem;
    }

    .card-content p {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    .learn-more {
      color: var(--link-blue);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: auto;
    }

    .learn-more:hover {
      text-decoration: underline;
    }

    /* 数据墙 */
    .stats-block {
      background: var(--dark-bg);
      color: white;
      padding: 80px 0;
      border-radius: 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }

    .stat-number {
      font-size: clamp(3rem, 6vw, 4.2rem);
      font-weight: 800;
      color: var(--accent);
      font-family: var(--font-en);
    }

    .stat-label {
      font-size: 0.95rem;
      color: var(--text-light);
      margin-top: 8px;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .testimonial-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      position: relative;
    }

    .quote-mark {
      font-size: 4rem;
      color: rgba(200,169,110,0.25);
      line-height: 1;
      margin-bottom: 12px;
    }

    .testimonial-text {
      font-style: italic;
      margin-bottom: 24px;
      font-size: 1rem;
    }

    .client-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar-placeholder {
      width: 40px;
      height: 40px;
      background: var(--primary);
      border-radius: 50%;
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      font-size: 1.1rem;
      font-weight: 600;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-heading);
      transition: color var(--transition);
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      transition: transform 0.2s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #4A5568;
    }

    .faq-answer p {
      padding-bottom: 20px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-section {
      background: var(--dark-bg);
      text-align: center;
      padding: 100px 0;
    }

    .cta-section h2 {
      color: white;
    }

    .cta-sub {
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }

    .trust-note {
      margin-top: 16px;
      color: var(--text-light);
      font-size: 0.85rem;
    }

    /* 页脚 */
    .footer {
      background: #FFFFFF;
      border-top: 1px solid var(--border-light);
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-heading);
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

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

    .copyright {
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
      border-top: 1px solid var(--border-light);
      padding-top: 24px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .solution-grid {
        grid-template-columns: 1fr;
      }
      .cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .cards-grid, .stats-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-actions {
        flex-direction: column;
        align-items: flex-start;
      }
      .btn {
        width: 100%;
      }
    }