/* roulang page: index */
:root {
      --primary: #0A4C5C;
      --primary-hover: #073A47;
      --accent: #C69C6D;
      --accent-hover: #B0854F;
      --bg: #FAFBFD;
      --card-bg: #FFFFFF;
      --text: #2E3B4E;
      --text-light: #6B7B8D;
      --border: #E5E9F0;
      --success: #2D9D7E;
      --shadow: 0 4px 20px rgba(10,76,92,0.06);
      --shadow-hover: 0 8px 30px rgba(10,76,92,0.12);
      --radius: 12px;
      --radius-sm: 8px;
      --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --nav-height: 64px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font);
      background: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      z-index: 100;
      border-bottom: 1px solid rgba(229,233,240,0.6);
      box-shadow: 0 2px 12px rgba(10,76,92,0.04);
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-logo i {
      color: var(--accent);
      font-size: 1.8rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: all 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .nav-cta {
      background: var(--accent);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.2s;
      border: none;
      cursor: pointer;
    }
    .nav-cta:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }
    /* Hero 分屏 */
    #hero {
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding-top: var(--nav-height);
      background: var(--bg);
    }
    .hero-left {
      width: 45%;
      padding: 40px 60px 40px 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      z-index: 2;
    }
    .hero-left h1 {
      font-size: 2.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-left .subtitle {
      font-size: 1.15rem;
      color: var(--text-light);
      margin-bottom: 32px;
      max-width: 450px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all 0.2s;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hero-right {
      width: 55%;
      height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }
    .hero-right::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, rgba(10,76,92,0.4) 0%, rgba(10,76,92,0.02) 60%);
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 50px;
      position: relative;
      padding-left: 18px;
      border-left: 4px solid var(--accent);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .card-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 2.2rem;
    }
    .card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--text);
    }
    .card p {
      color: var(--text-light);
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-top: auto;
    }
    .text-link i {
      font-size: 0.8rem;
    }
    /* 优势数据 */
    .advantages-row {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .adv-left {
      flex: 1;
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 32px;
    }
    .adv-item .number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }
    .adv-item .label {
      color: var(--text-light);
      margin-top: 8px;
      font-size: 0.95rem;
    }
    .adv-right {
      flex: 1;
      height: 320px;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }
    /* 案例卡片 */
    .case-card {
      display: flex;
      background: var(--card-bg);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      transition: all 0.25s;
      margin-bottom: 24px;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .case-img {
      width: 40%;
      min-height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 24px;
      display: flex;
      flex-direction: column;
    }
    .case-info h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }
    .tags {
      display: flex;
      gap: 8px;
      margin-top: 12px;
      flex-wrap: wrap;
    }
    .tag {
      background: rgba(10,76,92,0.08);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    /* 解决方案流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      gap: 24px;
    }
    .step-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 28px;
      text-align: center;
      flex:1;
      box-shadow: var(--shadow);
      transition: 0.2s;
    }
    .step-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.4rem;
      margin: 0 auto 16px;
    }
    /* FAQ */
    .accordion-item {
      background: var(--card-bg);
      border-radius: var(--radius);
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      border: 1px solid var(--border);
    }
    .accordion-title {
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1rem;
      color: var(--text);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-light);
      display: none;
      font-size: 0.95rem;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    .accordion-item.active {
      border-left: 4px solid var(--primary);
    }
    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: start;
    }
    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-family: var(--font);
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .form-group input:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,76,92,0.1);
    }
    .btn-submit {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 28px;
      border-radius: 6px;
      font-weight: 600;
      width: 100%;
      cursor: pointer;
    }
    .contact-info i {
      color: var(--accent);
      margin-right: 10px;
    }
    /* 页脚 */
    .footer {
      background: #0A3C48;
      color: #B0C4CC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 0.85rem;
    }
    @media (max-width: 1024px) {
      .hero-left { width: 50%; padding: 30px; }
      .hero-right { width: 50%; }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .steps { flex-wrap: wrap; }
    }
    @media (max-width: 768px) {
      .main-nav { padding: 0 20px; }
      .nav-links, .nav-cta { display: none; }
      .menu-toggle { display: block; }
      #hero { flex-direction: column; height: auto; }
      .hero-left { width: 100%; padding: 40px 20px; text-align: center; }
      .hero-right { width: 100%; height: 300px; }
      .advantages-row { flex-direction: column; }
      .grid-3, .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .case-card { flex-direction: column; }
      .case-img { width: 100%; height: 180px; }
      section { padding: 60px 0; }
    }