/* roulang page: index */
:root {
      --primary: #00C853;
      --primary-deep: #00A844;
      --secondary: #1E1E1E;
      --accent: #FF6D00;
      --accent-deep: #E65100;
      --gray-bg: #F5F6FA;
      --white: #FFFFFF;
      --text-main: #1E1E1E;
      --text-secondary: #5F6368;
      --text-light: #9AA0A6;
      --border: #E0E0E0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-inter: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-system: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-system);
      background: var(--gray-bg);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      font-size: 16px;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(0,200,83,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-deep);
      box-shadow: 0 6px 16px rgba(0,168,68,0.35);
    }
    .btn-outline {
      border: 2px solid var(--secondary);
      color: var(--secondary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--secondary);
      color: white;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      font-weight: 700;
      width: 100%;
      padding: 14px 28px;
      font-size: 18px;
    }
    .btn-accent:hover {
      background: var(--accent-deep);
    }
    h1, h2, h3 {
      font-weight: 700;
      line-height: 1.3;
    }
    h1 {
      font-size: clamp(2.2rem, 5vw, 3.25rem);
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: clamp(1.8rem, 4vw, 2.4rem);
      margin-bottom: 12px;
    }
    h3 {
      font-size: 1.25rem;
    }
    .section-title {
      text-align: center;
      margin-bottom: 40px;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      max-width: 600px;
      margin: 0 auto;
      text-align: center;
    }
    /* 导航 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-inter);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.3px;
    }
    .logo span {
      color: var(--secondary);
      font-weight: 600;
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-links a {
      position: relative;
      padding: 8px 0;
      color: var(--secondary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      width: 28px;
      padding: 4px;
    }
    .hamburger span {
      display: block;
      height: 2px;
      background: var(--secondary);
      border-radius: 4px;
      transition: 0.2s;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        gap: 20px;
        z-index: 99;
      }
      .mobile-menu.active {
        display: flex;
      }
      body.menu-open {
        overflow: hidden;
      }
    }
    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      padding: 100px 0;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.6);
    }
    .hero-content {
      position: relative;
      max-width: 700px;
    }
    .hero h1 {
      margin-bottom: 18px;
    }
    .hero p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .trust-badges {
      display: flex;
      gap: 24px;
      margin-top: 36px;
      flex-wrap: wrap;
    }
    .badge {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(4px);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    /* 指标看板 */
    .metrics {
      background: linear-gradient(180deg, #E8F5E9 0%, #F5F6FA 100%);
      padding: 60px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .metric-value {
      font-family: var(--font-inter);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .metric-label {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-top: 8px;
    }
    .trend-up { color: var(--primary); }
    /* 服务矩阵 */
    .services {
      padding: 70px 0;
      background: var(--white);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      text-align: left;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      background: #E8F5E9;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .service-card h3 {
      margin-bottom: 10px;
    }
    .service-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
      flex: 1;
    }
    .service-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: 16px;
      display: inline-flex;
      align-items: center;
    }
    /* 对比 */
    .compare {
      padding: 70px 0;
      background: var(--gray-bg);
    }
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: start;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.highlight {
      border: 2px solid var(--primary);
      background: #F1F8E9;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 16px 0;
      font-size: 1rem;
    }
    /* FAQ */
    .faq {
      padding: 70px 0;
      background: white;
    }
    .faq-grid {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--secondary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }
    /* 联系表单 */
    .contact {
      padding: 70px 0;
      background: #F0F2F5;
    }
    .contact-form {
      max-width: 680px;
      margin: 0 auto;
      background: white;
      padding: 40px;
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group input, .form-group textarea {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 1rem;
      transition: 0.2s;
    }
    .form-group input:focus, .form-group textarea:focus {
      border-color: var(--primary);
      outline: none;
      box-shadow: 0 0 0 3px rgba(0,200,83,0.1);
    }
    .trust-footer {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 24px;
      justify-content: center;
      color: var(--text-secondary);
    }
    /* Footer */
    .main-footer {
      background: #1E1E1E;
      color: #CCC;
      padding: 50px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-links a {
      display: block;
      margin: 8px 0;
      color: #AAA;
    }
    .footer-links a:hover { color: var(--primary); }
    .copyright {
      border-top: 1px solid #333;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .hero { padding: 70px 0; }
      .metrics-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-wrapper { grid-template-columns: 1fr; }
      .form-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }