/* roulang page: index */
:root {
      --primary: #0B3D2E;
      --primary-light: #0F4F3A;
      --accent: #D4A017;
      --accent-hover: #E5B83C;
      --bg-warm: #F7F5F0;
      --bg-khaki: #EAE3D3;
      --white: #FFFFFF;
      --text-body: #2C2C2C;
      --text-muted: #5F5F5F;
      --text-light: #B0B0B0;
      --green-data: #1A6B4A;
      --shadow-card: 0 2px 16px rgba(11,61,46,0.06);
      --shadow-hover: 0 8px 28px rgba(11,61,46,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Display", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3 {
      color: var(--primary);
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 600;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }

    p {
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-body);
    }

    .text-muted {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.6;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

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

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s ease;
      cursor: pointer;
      border: 2px solid transparent;
      white-space: nowrap;
    }

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

    .btn-primary:hover {
      background-color: var(--primary-light);
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }

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

    .btn-outline:hover {
      background-color: #E8F0ED;
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }

    .btn-accent {
      background-color: var(--accent);
      color: var(--primary);
      font-weight: 700;
      border-color: var(--accent);
    }

    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(212,160,23,0.3);
    }

    .btn-white-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
    }

    .btn-white-outline:hover {
      background: rgba(255,255,255,0.15);
      transform: translateY(-2px);
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: white;
      height: var(--nav-height);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      color: var(--accent);
      font-size: 24px;
    }

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

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease, left 0.25s ease;
    }

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

    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }

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

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
    }

    .hero::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 60%;
      background: linear-gradient(to top, rgba(11,61,46,0.85) 0%, transparent 100%);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero h1 {
      color: white;
      margin-bottom: 20px;
    }

    .hero-subtitle {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      color: white;
    }

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

    /* 数据看板 */
    .metrics-section {
      background: white;
      padding: 80px 0;
    }

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

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .metric-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }

    .metric-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .services-section {
      background: var(--bg-khaki);
      padding: 80px 0;
    }

    .services-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .service-card.featured {
      border-left: 4px solid var(--accent);
    }

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

    .service-image {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }

    .service-card h3 {
      margin-bottom: 12px;
    }

    .service-link {
      margin-top: auto;
      color: var(--accent);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .small-cards {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .icon-circle {
      width: 40px;
      height: 40px;
      background: #E8F0ED;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      margin-bottom: 12px;
    }

    /* 对比区 */
    .compare-section {
      background: white;
      padding: 80px 0;
    }

    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin: 48px 0;
    }

    .compare-col {
      background: #F9F9F7;
      border-radius: var(--radius-card);
      padding: 32px;
    }

    .compare-col.highlight {
      background: white;
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-card);
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 0;
      border-bottom: 1px solid #E0E0D8;
    }

    .compare-item i {
      color: var(--accent);
    }

    .compare-cta {
      text-align: center;
      margin-top: 32px;
    }

    /* FAQ */
    .faq-section {
      background: var(--bg-khaki);
      padding: 80px 0;
    }

    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: 0 1px 8px rgba(0,0,0,0.03);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 3px solid var(--accent);
      background: white;
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-muted);
      display: none;
      background: #FCFCFA;
      border-top: 1px solid #EDEDE4;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    .faq-arrow {
      transition: transform 0.3s;
    }

    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }

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

    .cta-section h2 {
      color: white;
    }

    .cta-subtitle {
      color: rgba(255,255,255,0.85);
      margin: 16px 0 32px;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      max-width: 700px;
      margin: 0 auto;
    }

    .cta-form input {
      flex: 1 1 180px;
      padding: 14px 16px;
      border-radius: var(--radius-input);
      border: none;
      font-size: 15px;
      background: white;
    }

    .privacy-note {
      margin-top: 16px;
      font-size: 13px;
      opacity: 0.7;
    }

    /* 页脚 */
    .site-footer {
      background: #1A1A1A;
      color: var(--text-light);
      padding: 60px 0 30px;
    }

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

    .footer-links a {
      display: block;
      color: var(--text-light);
      margin-bottom: 8px;
      font-size: 14px;
    }

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

    .copyright {
      text-align: center;
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid #333;
      font-size: 13px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .compare-table {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--primary);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        color: white;
        font-size: 18px;
      }
      .hamburger {
        display: block;
      }
      .hero {
        min-height: 70vh;
        text-align: center;
      }
      .hero-content {
        align-items: center;
      }
      .hero-buttons {
        justify-content: center;
      }
      .cta-form {
        flex-direction: column;
        align-items: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }