/* roulang page: index */
:root {
      --primary: #E94E1B;
      --primary-dark: #C43D14;
      --secondary: #1B1E2F;
      --accent: #00C48C;
      --bg: #F9FAFB;
      --white: #FFFFFF;
      --text: #4A4F5C;
      --text-light: #7A7F8C;
      --border: #E8EAED;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-lg: 16px;
      --radius-btn: 30px;
      --transition: 0.25s ease;
      --font-h1: 48px;
      --font-h2: 36px;
      --font-h3: 24px;
      --container: 1200px;
      --nav-height: 64px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--nav-height);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .button {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(0,0,0,0.78);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid rgba(255,255,255,0.12);
      display: flex;
      align-items: center;
    }
    .nav-container {
      max-width: var(--container);
      margin: 0 auto;
      width: 100%;
      padding: 0 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .logo-text {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #fff 0%, #ddd 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: #ddd;
      font-size: 14px;
      font-weight: 600;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary);
      transform: scaleX(0);
      transition: transform 0.2s ease;
      border-radius: 2px;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      transform: scaleX(1);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: 30px;
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
      margin-left: 10px;
      display: inline-block;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }
    .search-icon {
      color: white;
      font-size: 1.1rem;
      margin-left: 8px;
      opacity: 0.8;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    /* Hero 分屏 */
    .hero-grid {
      display: flex;
      min-height: 85vh;
      background: var(--white);
    }
    .hero-left {
      width: 50%;
      display: flex;
      align-items: center;
      padding: 0 60px;
    }
    .hero-right {
      width: 50%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at bottom right, rgba(233,78,27,0.5) 0%, transparent 70%);
    }
    .hero-content h1 {
      font-size: var(--font-h1);
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.15;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    .hero-content h1::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 80px;
      height: 5px;
      background: linear-gradient(to right, var(--primary), var(--accent));
      border-radius: 4px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-light);
      margin: 2rem 0 2.5rem;
      max-width: 450px;
    }
    .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: 600;
      font-size: 15px;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
      border: none;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: background var(--transition);
    }
    .btn-outline:hover {
      background: rgba(233,78,27,0.08);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    /* 价值主张条带 */
    .value-strip {
      background: var(--white);
      border-bottom: 1px solid var(--border);
    }
    .value-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      gap: 30px;
    }
    .value-item i {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 0.8rem;
    }
    .value-item h4 {
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 0.3rem;
    }
    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: #FFF0EB;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.2rem;
      color: var(--primary);
      font-size: 1.5rem;
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 0.8rem;
    }
    .tags {
      display: flex;
      gap: 8px;
      margin-top: 1.2rem;
      flex-wrap: wrap;
    }
    .tag {
      background: #F0F2F5;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-light);
    }
    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .scenario-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .scenario-text {
      flex: 1;
      position: relative;
    }
    .watermark {
      font-size: 64px;
      font-weight: 800;
      color: rgba(0,0,0,0.03);
      position: absolute;
      top: -20px;
      left: -10px;
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition);
    }
    .case-card:hover {
      transform: translateY(-5px);
    }
    .case-img {
      height: 180px;
      object-fit: cover;
    }
    .case-body {
      padding: 24px;
    }
    .case-meta {
      display: flex;
      justify-content: space-between;
      font-size: 14px;
      color: var(--text-light);
    }
    .case-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      margin: 0.5rem 0;
    }
    /* 定价 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .pricing-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      border: 2px solid transparent;
      transition: all var(--transition);
    }
    .pricing-card.featured {
      border-color: var(--primary);
      position: relative;
    }
    .popular-badge {
      background: var(--primary);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 13px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 48px;
      font-weight: 700;
      color: var(--secondary);
      margin: 1rem 0;
    }
    .feature-list {
      list-style: none;
      text-align: left;
      margin: 2rem 0;
    }
    .feature-list li {
      margin: 12px 0;
      color: var(--text);
    }
    .feature-list i {
      color: var(--accent);
      margin-right: 8px;
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border);
      padding: 1.2rem 0;
    }
    .accordion-title {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--secondary);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text);
      padding-top: 0;
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding-top: 1rem;
    }
    /* CTA 条带 */
    .cta-strip {
      background: linear-gradient(135deg, #E94E1B 0%, #1B1E2F 100%);
      text-align: center;
      color: white;
    }
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #B0B5C0;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .subscribe-input {
      display: flex;
      margin-top: 1rem;
    }
    .subscribe-input input {
      flex: 1;
      padding: 12px;
      border-radius: 8px 0 0 8px;
      border: none;
    }
    .subscribe-input button {
      background: var(--primary);
      border: none;
      color: white;
      padding: 0 20px;
      border-radius: 0 8px 8px 0;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        width: 100%;
      }
      .hero-right {
        height: 300px;
      }
      .features-grid, .cases-grid, .pricing-grid {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 640px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .features-grid, .cases-grid, .pricing-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .scenario-row {
        flex-direction: column;
      }
    }