/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #0A0E17;
      --accent: #D4AF37;
      --bg: #FAFAFA;
      --surface: #FFFFFF;
      --text-main: #2C2C2C;
      --text-muted: #5A5A5A;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-md: 8px;
      --radius-btn: 6px;
      --transition: 0.25s ease;
      --font-sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', monospace;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 排版微调 */
    h1, h2, h3, .heading {
      letter-spacing: -0.02em;
      line-height: 1.2;
      font-weight: 700;
    }

    .text-accent {
      color: var(--accent);
    }

    .bg-accent-light {
      background-color: #FBF7ED;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      padding: 12px 28px;
      transition: all var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-primary:hover {
      background-color: var(--accent);
      border-color: var(--accent);
      color: var(--primary);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(212, 175, 55, 0.25);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    /* 卡片通用 */
    .card {
      background: var(--surface);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      border: 1px solid var(--border-light);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }

    /* 导航栏 */
    #command-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      z-index: 50;
      display: flex;
      align-items: center;
      padding: 0 40px;
    }

    .nav-logo {
      font-weight: 700;
      font-size: 1.25rem;
      letter-spacing: -0.02em;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-logo i {
      color: var(--accent);
      font-size: 0.9rem;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      margin-left: 48px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent);
    }

    .nav-right {
      margin-left: auto;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-box {
      background: #f5f5f5;
      border-radius: 20px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: #6b7280;
      font-size: 14px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      width: 140px;
      font-size: 14px;
    }

    .hamburger {
      display: none;
      font-size: 1.5rem;
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: block;
        margin-left: auto;
      }
    }

    /* Hero 双栏 */
    .hero-grid {
      display: grid;
      grid-template-columns: 55% 45%;
      min-height: 90vh;
      align-items: center;
      gap: 60px;
      padding-top: 80px;
      background: linear-gradient(180deg, #F2F2F2 0%, #FAFAFA 100%);
    }
    .hero-left h1 {
      font-size: 3.8rem;
      font-weight: 800;
      margin-bottom: 1.2rem;
      line-height: 1.1;
    }
    .hero-left p {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right img {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
      transition: opacity 0.6s ease;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        padding-top: 100px;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2.8rem;
      }
      .hero-right {
        order: -1;
      }
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0;
      margin: 80px 0;
    }
    .highlight-item {
      padding: 40px 32px;
      border-right: 1px solid var(--border-light);
    }
    .highlight-item:last-child {
      border-right: none;
    }
    .highlight-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 8px;
    }
    .highlight-title {
      font-weight: 700;
      font-size: 1.25rem;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .highlight-item {
        border-right: none;
        border-bottom: 1px solid var(--border-light);
      }
    }

    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin: 60px 0;
    }
    .case-card {
      position: relative;
      overflow: hidden;
      border-radius: var(--radius-md);
      background: white;
      box-shadow: var(--shadow-card);
    }
    .case-img-wrap {
      position: relative;
      overflow: hidden;
      border-top: 4px solid var(--accent);
    }
    .case-img-wrap img {
      transition: transform 0.3s ease;
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(10,14,23,0.7);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: 0.3s;
      color: white;
      font-weight: 600;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    .case-content {
      padding: 20px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      margin: 60px 0;
    }
    .compare-col {
      background: white;
      border-radius: var(--radius-md);
      padding: 40px;
      box-shadow: var(--shadow-card);
    }
    .compare-col.right {
      background: #FBF7ED;
      border-left: 6px solid var(--accent);
    }
    .compare-list {
      list-style: none;
      margin-top: 24px;
    }
    .compare-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ 双栏 */
    .faq-layout {
      display: grid;
      grid-template-columns: 280px 1fr;
      gap: 60px;
      margin: 60px 0;
    }
    .faq-index {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .faq-index-item {
      padding: 10px 16px;
      border-left: 3px solid transparent;
      cursor: pointer;
      font-weight: 500;
      transition: 0.2s;
    }
    .faq-index-item.active {
      border-left-color: var(--accent);
      color: var(--accent);
      background: #f9f9f9;
    }
    .faq-detail {
      background: #f5f5f5;
      border-radius: var(--radius-md);
      padding: 32px;
    }
    @media (max-width: 768px) {
      .faq-layout {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }

    /* 底部CTA */
    .cta-final {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 100px 20px;
      margin-top: 80px;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 40px;
      color: #aaa;
    }
    .footer-grid h4 {
      color: white;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    .copyright {
      border-top: 1px solid #2a2a2a;
      padding: 20px 0;
      font-size: 13px;
      color: #777;
    }