/* roulang page: index */
:root {
      --black-magma: #0D0B0C;
      --purple-lightning: #A855F7;
      --orange-flame: #F97316;
      --orange-glow: #FB923C;
      --cyan-neon: #22D3EE;
      --gray-deep: #1A1A1E;
      --gray-card: rgba(26,26,30,0.9);
      --white-soft: #F5F5F7;
      --text-primary: #EDEDF0;
      --text-secondary: #B0B0B8;
      --border-subtle: rgba(168,85,247,0.15);
      --border-hover: rgba(168,85,247,0.5);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --shadow-glow: 0 8px 30px rgba(168,85,247,0.2);
      --transition-smooth: all 0.25s ease;
      --font-system: "PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
      --spacing-section: 90px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      padding: 0;
      background-color: var(--black-magma);
      font-family: var(--font-system);
      color: var(--text-primary);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, .button {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition-smooth);
      border: none;
      outline: none;
      font-weight: 700;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航栏 - 搜索主导型 */
    .site-header {
      background: rgba(13,11,12,0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      padding: 16px 0;
      position: sticky;
      top: 0;
      z-index: 50;
      border-bottom: 1px solid var(--border-subtle);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo-brand {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-primary);
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: 1px;
      text-transform: uppercase;
      white-space: nowrap;
    }

    .logo-brand i {
      color: var(--purple-lightning);
      font-size: 2rem;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: rgba(26,26,30,0.85);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-subtle);
      border-radius: 24px;
      padding: 0 20px;
      width: 400px;
      max-width: 100%;
      transition: var(--transition-smooth);
    }

    .search-box i {
      color: var(--cyan-neon);
      font-size: 1.1rem;
      margin-right: 10px;
    }

    .search-box input {
      background: transparent;
      border: none;
      padding: 14px 0;
      font-size: 0.95rem;
      color: var(--text-primary);
      width: 100%;
      outline: none;
    }

    .search-box input::placeholder {
      color: var(--text-secondary);
      font-weight: 400;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .nav-links a {
      color: var(--purple-lightning);
      font-weight: 600;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--orange-flame);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      background: transparent;
      color: var(--purple-lightning);
      font-size: 1.8rem;
      border: none;
      cursor: pointer;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(13,11,12,0.96);
      backdrop-filter: blur(20px);
      padding: 20px;
      gap: 18px;
      border-radius: 0 0 20px 20px;
    }

    .mobile-menu a {
      color: var(--purple-lightning);
      font-weight: 600;
      font-size: 1.1rem;
    }

    /* Hero */
    #hero {
      padding: 100px 0 var(--spacing-section);
      position: relative;
      background: radial-gradient(circle at 30% 40%, #1f1235 0%, #0D0B0C 75%);
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero-text h1 {
      font-size: clamp(2.6rem, 6vw, 3.5rem);
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: white;
      text-shadow: 0 0 20px rgba(168,85,247,0.35);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 550px;
    }

    .btn-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--orange-flame);
      color: white;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      box-shadow: 0 4px 14px rgba(249,115,22,0.35);
    }

    .btn-primary:hover {
      background: var(--orange-glow);
      box-shadow: 0 0 22px rgba(249,115,22,0.6);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--purple-lightning);
      color: var(--purple-lightning);
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 700;
    }

    .btn-outline:hover {
      background: var(--purple-lightning);
      color: white;
      box-shadow: 0 0 18px rgba(168,85,247,0.6);
    }

    .hero-image {
      flex: 1 1 400px;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      border: 2px solid rgba(168,85,247,0.3);
      position: relative;
    }

    .hero-image img {
      width: 100%;
      height: auto;
      filter: brightness(0.9) contrast(1.1);
    }

    /* 通用区块标题 */
    .section-title {
      font-size: clamp(2rem, 4.5vw, 2.5rem);
      font-weight: 700;
      margin-bottom: 12px;
      color: white;
      position: relative;
      display: inline-block;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    /* 价值主张 */
    #value {
      padding: var(--spacing-section) 0;
      background: #0D0B0C;
    }

    .value-grid {
      display: grid;
      grid-template-columns: 1.3fr 0.9fr 1.1fr 0.9fr;
      gap: 24px;
      align-items: start;
    }

    .value-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 28px 22px;
      transition: var(--transition-smooth);
    }

    .value-card:nth-child(odd) {
      transform: translateY(-18px);
    }

    .value-card:hover {
      border-color: var(--border-hover);
      box-shadow: var(--shadow-glow);
      transform: translateY(-6px);
    }

    .value-icon {
      font-size: 2rem;
      color: var(--cyan-neon);
      margin-bottom: 18px;
    }

    .value-card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      color: white;
      margin-bottom: 10px;
    }

    /* 功能分组 */
    #features {
      padding: var(--spacing-section) 0;
      background: #0D0B0C;
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .feature-item {
      background: var(--gray-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 28px 18px;
      backdrop-filter: blur(8px);
      transition: var(--transition-smooth);
    }

    .feature-item i {
      color: var(--cyan-neon);
      font-size: 2rem;
      margin-bottom: 18px;
    }

    .feature-item h3 {
      font-weight: 700;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }

    /* 使用场景 图文交错 */
    #scenarios {
      padding: var(--spacing-section) 0;
      background: #0D0B0C;
    }

    .scenario-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 70px;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .scenario-text {
      flex: 1;
    }

    .scenario-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      border: 2px solid var(--border-subtle);
    }

    .scenario-img img {
      width: 100%;
      height: auto;
    }

    /* 案例 */
    #cases {
      padding: var(--spacing-section) 0;
      background: #09080a;
    }

    .logo-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 35px;
      margin-bottom: 45px;
      filter: grayscale(1);
      opacity: 0.7;
    }

    .case-cards {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 22px;
    }

    .case-card {
      background: var(--gray-card);
      border-radius: var(--radius-card);
      padding: 26px;
      border: 1px solid var(--border-subtle);
    }

    .stat-highlight {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--cyan-neon);
    }

    /* FAQ */
    #faq {
      padding: var(--spacing-section) 0;
    }

    .accordion-item {
      background: var(--gray-card);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .accordion-btn {
      width: 100%;
      background: transparent;
      color: white;
      text-align: left;
      padding: 18px 22px;
      font-weight: 700;
      font-size: 1.05rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .accordion-content {
      padding: 0 22px 18px;
      color: var(--text-secondary);
    }

    /* 价格 */
    #pricing {
      padding: var(--spacing-section) 0;
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }

    .plan-card {
      background: rgba(255,255,255,0.04);
      border-radius: var(--radius-card);
      padding: 32px 22px;
      border: 1px solid var(--border-subtle);
      position: relative;
    }

    .plan-card.featured {
      border-color: var(--purple-lightning);
    }

    .badge-popular {
      background: var(--orange-flame);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      position: absolute;
      top: -12px;
      right: 20px;
    }

    .price-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--cyan-neon);
    }

    /* CTA */
    #cta {
      padding: var(--spacing-section) 0;
      background: radial-gradient(circle at 20% 30%, #2b1040, #0D0B0C);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      color: var(--text-secondary);
    }

    .copyright {
      border-top: 1px solid rgba(168,85,247,0.2);
      margin-top: 40px;
      padding-top: 22px;
      text-align: center;
      color: var(--text-secondary);
    }

    @media (max-width: 1024px) {
      .value-grid, .features-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .pricing-grid, .case-cards {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .search-box {
        width: 220px;
      }
    }

    @media (max-width: 640px) {
      .value-grid, .features-grid {
        grid-template-columns: 1fr;
      }
      .scenario-row {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }