/* roulang page: index */
:root {
      --deep-blue: #0A1F3F;
      --energy-orange: #FF6B35;
      --warm-bg: #FAFAF8;
      --card-white: #FFFFFF;
      --text-body: #2D3748;
      --text-muted: #718096;
      --light-gray-bg: #F0F2F5;
      --border-light: #E2E8F0;
      --success-green: #38A169;
      --shadow-sm: 0 4px 20px rgba(10,31,63,0.04);
      --shadow-md: 0 12px 32px rgba(10,31,63,0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Montserrat", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 顶部信息条 */
    .utility-bar {
      background: var(--light-gray-bg);
      height: 36px;
      display: flex;
      align-items: center;
      font-size: 12px;
      color: var(--text-muted);
    }
    .utility-bar .container {
      display: flex;
      justify-content: space-between;
      width: 100%;
    }
    .utility-bar a {
      color: var(--text-muted);
      text-decoration: none;
      margin-left: 20px;
    }
    .utility-bar a:hover {
      color: var(--deep-blue);
    }
    /* 主导航 */
    .main-nav {
      background: white;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
    }
    .main-nav .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--deep-blue);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      letter-spacing: 1px;
    }
    .logo i {
      color: var(--energy-orange);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-muted);
      font-weight: 500;
      font-size: 16px;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 6px;
    }
    .nav-links a:hover {
      color: var(--deep-blue);
    }
    .nav-links a.active {
      color: var(--deep-blue);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--energy-orange);
    }
    .btn-primary {
      background: var(--energy-orange);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.2s ease;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 4px 10px rgba(255,107,53,0.2);
    }
    .btn-primary:hover {
      background: #E55A2B;
      transform: scale(1.02);
      box-shadow: 0 8px 18px rgba(255,107,53,0.3);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid var(--deep-blue);
      color: var(--deep-blue);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.2s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-ghost:hover {
      background: var(--deep-blue);
      color: white;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--deep-blue);
      cursor: pointer;
    }
    /* Hero 双栏 */
    .hero {
      padding: 80px 0;
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--deep-blue);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-left p {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 40px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1;
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 420px;
      box-shadow: var(--shadow-md);
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(10,31,63,0.7) 0%, rgba(10,31,63,0.1) 100%);
      display: flex;
      align-items: flex-end;
      padding: 32px;
    }
    .stat-card {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      padding: 20px 24px;
      border-radius: 12px;
      color: var(--deep-blue);
      display: flex;
      gap: 24px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 28px;
      font-weight: 700;
      color: var(--energy-orange);
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      font-size: 36px;
      font-weight: 600;
      color: var(--deep-blue);
      margin-bottom: 16px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 60px;
    }
    /* 亮点网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--card-white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      text-align: center;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .highlight-icon {
      font-size: 32px;
      color: var(--energy-orange);
      margin-bottom: 20px;
      transition: transform 0.2s;
    }
    .highlight-card:hover .highlight-icon {
      transform: rotate(3deg);
    }
    .highlight-card h3 {
      font-size: 22px;
      color: var(--deep-blue);
      margin-bottom: 12px;
    }
    /* 案例瀑布流 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      height: 240px;
      background-size: cover;
      background-position: center;
    }
    .case-content {
      padding: 24px;
    }
    .tag {
      background: #EBF4FF;
      color: var(--deep-blue);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
      display: inline-block;
      margin-right: 8px;
    }
    /* 方案对比 */
    .compare-table {
      display: flex;
      gap: 24px;
      margin-top: 40px;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-col.left {
      background: #F4F6F9;
    }
    .compare-col.right {
      background: #F0F4FF;
      border: 1px solid #D0DFFF;
    }
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 16px 0;
      border-bottom: 1px solid var(--border-light);
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      color: var(--deep-blue);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
      background: #F7FAFC;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA横幅 */
    .cta-banner {
      background: var(--deep-blue);
      padding: 80px 0;
      text-align: center;
    }
    .cta-banner h2 {
      color: white;
      font-size: 36px;
      margin-bottom: 16px;
    }
    /* 页脚 */
    .footer {
      background: var(--deep-blue);
      color: #B8C7D9;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-bottom {
      border-top: 1px solid #2D3A5C;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
    }
    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
      }
      .grid-3 {
        grid-template-columns: repeat(2,1fr);
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .compare-table {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .grid-3 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-left h1 {
        font-size: 36px;
      }
    }