/* roulang page: index */
:root {
      --primary: #1A3C2A;
      --accent: #E85D04;
      --bg-warm: #F5F2EB;
      --white: #FFFFFF;
      --dark-bg: #2C2C2C;
      --text-main: #1E1E1E;
      --text-muted: #5A5A5A;
      --text-light: #FFFFFF;
      --border-light: #EBE8E2;
      --border-input: #D4D0C8;
      --radius-card: 12px;
      --radius-inner: 8px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.10);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-heading);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 99;
      display: flex;
      align-items: center;
      padding: 0 24px;
    }

    .nav-inner {
      max-width: 1200px;
      margin: 0 auto;
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-links a {
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      font-size: 0.95rem;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }

    .nav-cta {
      background: var(--accent);
      color: white !important;
      padding: 8px 20px !important;
      border-radius: 30px;
      font-weight: 600;
      border: none !important;
    }
    .nav-cta:hover {
      background: #C94D00;
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--primary);
      cursor: pointer;
      background: none;
      border: none;
    }

    /* 移动端导航面板 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 56px;
      left: 0;
      width: 100%;
      background: var(--primary);
      flex-direction: column;
      padding: 20px 24px;
      gap: 16px;
      z-index: 98;
      box-shadow: 0 10px 20px rgba(0,0,0,0.15);
    }
    .mobile-menu a {
      color: white;
      font-size: 1.1rem;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 8px;
    }
    .mobile-menu .nav-cta {
      background: var(--accent);
      text-align: center;
      border-radius: 8px;
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu.active { display: flex; }
    }

    /* Hero 分屏 */
    #hero {
      display: flex;
      min-height: 100vh;
      padding-top: 56px;
      background-color: var(--white);
    }
    .hero-left {
      width: 55%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 0 8% 0 5%;
    }
    .hero-right {
      width: 45%;
      background-image: url('/assets/images/backpic/hero-bg.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(26,60,42,0.08) 0%, rgba(0,0,0,0.1) 100%);
    }
    .hero-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #C94D00;
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: var(--primary);
      color: white;
    }
    .trust-logos {
      display: flex;
      gap: 20px;
      align-items: center;
      opacity: 0.8;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      #hero {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        width: 100%;
      }
      .hero-left {
        padding: 48px 24px;
      }
      .hero-right {
        height: 320px;
        order: -1;
      }
      h1 {
        font-size: 2.4rem;
      }
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .section-desc {
      color: var(--text-muted);
      margin-bottom: 48px;
    }

    /* 数据看板 */
    #metrics {
      background: var(--bg-warm);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item {
      background: white;
      padding: 32px 16px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .metric-number {
      font-size: 3.4rem;
      font-weight: 800;
      color: var(--accent);
      letter-spacing: -1px;
      line-height: 1.1;
    }
    .metric-label {
      color: var(--text-muted);
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .metrics-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* 服务矩阵 */
    .service-top {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 32px;
    }
    .service-bottom {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 28px;
      border: 1px solid var(--border-light);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 2.8rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-img {
      height: 140px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-inner);
      margin-bottom: 16px;
    }
    .accent-bg {
      background: var(--accent);
      color: white;
    }
    .accent-bg h3, .accent-bg p {
      color: white;
    }
    @media (max-width: 768px) {
      .service-top, .service-bottom {
        grid-template-columns: 1fr;
      }
    }

    /* 对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: start;
    }
    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .compare-col h3 {
      font-weight: 700;
      margin-bottom: 24px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px;
      font-size: 1rem;
    }
    .green-check {
      color: var(--primary);
      font-weight: bold;
    }
    .gray-minus {
      color: #999;
    }
    @media (max-width: 768px) {
      .compare-wrapper {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      background: white;
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }
    .accordion-title:hover {
      color: var(--accent);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafaf8;
      padding: 0 24px;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding: 16px 24px;
    }

    /* 表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-input);
      border-radius: 6px;
      margin-bottom: 16px;
      font-family: inherit;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      outline: none;
      border-color: var(--primary);
    }
    .contact-info {
      background: var(--bg-warm);
      padding: 32px;
      border-radius: var(--radius-card);
    }
    .contact-img {
      height: 200px;
      background-image: url('/assets/images/coverpic/contact.webp');
      background-size: cover;
      border-radius: var(--radius-inner);
      margin-top: 24px;
    }
    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 页脚 */
    .site-footer {
      background: var(--dark-bg);
      color: #ccc;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-grid h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer-bottom {
      border-top: 1px solid #444;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }