/* roulang page: index */
:root {
      --primary: #FF6B35;
      --primary-dark: #E55A2B;
      --secondary-green: #1A3C34;
      --accent-cyan: #00C9A7;
      --accent-amber: #FFB800;
      --bg-warm: #FDF8F5;
      --text-dark: #2D2D2D;
      --text-mid: #6B6B6B;
      --text-light: #999999;
      --white: #FFFFFF;
      --gray-light: #F0F0F0;
      --border-color: #E0E0E0;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --section-gap: 100px;
      --nav-height: 72px;
      --font-heading: 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Sans SC', sans-serif;
      --font-data: 'Inter', 'DIN Alternate', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--nav-height);
    }
    h1, h2, h3, h4, .data-number {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.01em;
    }
    .data-number {
      font-family: var(--font-data);
      font-weight: 700;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    a:hover {
      color: var(--primary);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航固定顶部 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid 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-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: 1px;
      line-height: 1;
    }
    .logo span {
      color: var(--secondary-green);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-dark);
      padding: 6px 0;
      position: relative;
      letter-spacing: 0.3px;
    }
    .nav-links li a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links li a:hover::after,
    .nav-links li a.active::after {
      width: 100%;
    }
    .nav-cta {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.2s;
    }
    .nav-cta:hover {
      background: var(--primary);
      color: white;
    }
    /* 汉堡菜单覆盖 */
    .menu-icon {
      color: var(--text-dark);
    }
    .off-canvas-content {
      padding-top: 0;
    }
    @media screen and (max-width: 840px) {
      .nav-links {
        display: none;
      }
      .title-bar {
        background: transparent;
      }
      .menu-icon::after {
        background: var(--text-dark);
      }
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #FDF8F5 0%, #FFF3EB 100%);
      position: relative;
      overflow: hidden;
      padding: 70px 0 40px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      line-height: 1.2;
      margin-bottom: 1rem;
      color: var(--secondary-green);
    }
    .hero-text h1 .highlight {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-mid);
      margin-bottom: 1.5rem;
    }
    .hero-desc {
      font-size: 1rem;
      color: var(--text-mid);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: background 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      color: white;
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      background: transparent;
      transition: all 0.2s;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(255,107,53,0.08);
      color: var(--primary);
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 24px;
      position: relative;
      display: flex;
      align-items: flex-end;
      justify-content: center;
      box-shadow: var(--card-shadow);
    }
    .hero-stats {
      display: flex;
      gap: 20px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 20px 28px;
      margin: 0 20px 20px;
      width: calc(100% - 40px);
    }
    .stat-item h3 {
      font-size: 1.8rem;
      color: var(--primary);
      margin:0;
    }
    .stat-item p {
      font-size: 0.85rem;
      color: var(--text-mid);
    }
    @media screen and (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-visual {
        order: -1;
        min-height: 280px;
      }
    }
    /* 服务矩阵 非对称 */
    #matrix {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 2.2rem;
      margin-bottom: 0.5rem;
      color: var(--secondary-green);
    }
    .section-sub {
      color: var(--text-mid);
      margin-bottom: 3rem;
    }
    .matrix-grid {
      display: grid;
      grid-template-columns: 1.3fr 0.9fr;
      gap: 28px;
    }
    .card-large {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      transition: all 0.25s;
      border-left: 5px solid var(--primary);
    }
    .card-small-group {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .card-small {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--card-shadow);
      transition: all 0.25s;
    }
    .card-large:hover, .card-small:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }
    .card-icon {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .card-desc {
      color: var(--text-mid);
      font-size: 0.95rem;
      flex:1;
    }
    .arrow-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: 12px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    @media screen and (max-width: 768px) {
      .matrix-grid {
        grid-template-columns: 1fr;
      }
      .card-small-group {
        grid-template-columns: 1fr;
      }
    }
    /* 数据对比 */
    #data {
      background: #F9F6F2;
      padding: var(--section-gap) 0;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 24px;
      align-items: center;
    }
    .panel-before, .panel-after {
      background: white;
      border-radius: 20px;
      padding: 32px;
      box-shadow: var(--card-shadow);
    }
    .panel-before {
      background: #F0F0F0;
      color: #4A4A4A;
    }
    .panel-after {
      background: rgba(255,107,53,0.06);
      border: 1px solid rgba(255,107,53,0.2);
    }
    .vs-divider {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
      background: white;
      width: 56px;
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      box-shadow: var(--card-shadow);
    }
    .metric-row {
      display: flex;
      justify-content: space-between;
      margin-bottom: 18px;
    }
    .progress-bar {
      height: 8px;
      background: #ddd;
      border-radius: 4px;
      width: 100%;
      margin-top: 6px;
    }
    .progress-fill {
      height: 8px;
      background: var(--accent-cyan);
      border-radius: 4px;
      width: 0%;
    }
    @media screen and (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .vs-divider {
        margin: 10px auto;
      }
    }
    /* FAQ */
    #faq {
      padding: var(--section-gap) 0;
      background: white;
    }
    .accordion-title {
      font-weight: 700;
      font-size: 1.1rem;
      border-bottom: 1px solid #eee;
      padding: 18px 0;
      position: relative;
    }
    .accordion-title::before {
      content: '';
      position: absolute;
      left: -12px;
      top: 18px;
      height: 24px;
      width: 3px;
      background: transparent;
      transition: background 0.2s;
    }
    .is-active .accordion-title::before {
      background: var(--primary);
    }
    .accordion-content {
      padding: 12px 0 24px;
      color: var(--text-mid);
      line-height: 1.8;
    }
    /* 联系表单 */
    #contact {
      padding: var(--section-gap) 0;
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }
    .form-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
    }
    .input-group {
      margin-bottom: 20px;
    }
    input, textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-input);
      background: #F9F9F9;
      font-family: var(--font-body);
    }
    input:focus, textarea:focus {
      border-color: var(--primary);
      outline: none;
      background: white;
    }
    .trust-logos img {
      height: 38px;
      opacity: 0.7;
      margin-right: 20px;
    }
    @media screen and (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 页脚 */
    .site-footer {
      background: #1A1A1A;
      color: #999;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer-brand p {
      margin: 12px 0;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 14px;
      color: #aaa;
      transition: color 0.2s;
    }
    .social-icons i:hover {
      color: var(--primary);
    }
    .footer-links h4 {
      color: white;
      margin-bottom: 12px;
    }
    .footer-links a {
      display: block;
      color: #aaa;
      margin-bottom: 8px;
    }
    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }