/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --bg-deep: #0B0C10;
      --bg-alt: #0F1115;
      --bg-footer: #08090C;
      --primary-purple: #A855F7;
      --primary-purple-glow: rgba(168,85,247,0.5);
      --accent-cyan: #06D6A0;
      --accent-gold: #F59E0B;
      --text-white: #FFFFFF;
      --text-body: rgba(255,255,255,0.75);
      --text-muted: rgba(255,255,255,0.5);
      --border-light: rgba(255,255,255,0.06);
      --border-card: rgba(255,255,255,0.08);
      --card-bg: rgba(255,255,255,0.03);
      --card-hover-shadow: 0 16px 48px rgba(168,85,247,0.15), 0 0 0 1px rgba(168,85,247,0.2) inset;
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.05) inset;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
      --font-mono: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    
    /* ----- 基础重置与全局样式 ----- */
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      font-size: 1rem;
    }
    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-sans);
      color: var(--text-white);
      margin-top: 0;
    }
    a {
      color: var(--text-white);
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    a:hover {
      color: var(--primary-purple);
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .button {
      font-family: var(--font-sans);
      cursor: pointer;
    }
    /* 容器微调 */
    .grid-container {
      max-width: 1200px;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* ----- 导航栏 (sticky, 玻璃效果) ----- */
    #main-nav {
      background: rgba(11,12,16,0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-light);
      padding: 0.75rem 0;
      position: sticky;
      top: 0;
      z-index: 50;
      transition: var(--transition-smooth);
    }
    .nav-brand {
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--text-white);
    }
    .nav-brand i {
      color: var(--primary-purple);
      font-size: 1.9rem;
    }
    .nav-link {
      color: var(--text-muted);
      font-weight: 500;
      margin: 0 0.4rem;
      padding: 0.5rem 0.75rem;
      border-radius: 8px;
      transition: var(--transition-smooth);
    }
    .nav-link:hover {
      color: var(--text-white);
      background: rgba(168,85,247,0.1);
    }
    .cta-btn-main {
      background: var(--primary-purple);
      color: white;
      font-weight: 700;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-pill);
      box-shadow: 0 0 20px var(--primary-purple-glow), 0 4px 16px rgba(168,85,247,0.3);
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
      border: none;
      font-size: 1rem;
      letter-spacing: 0.3px;
    }
    .cta-btn-main:hover {
      transform: scale(1.05);
      box-shadow: 0 0 28px rgba(168,85,247,0.8), 0 6px 20px rgba(168,85,247,0.5);
      color: white;
    }
    /* 移动端汉堡菜单调整 */
    .menu-icon::after {
      background: white;
      box-shadow: 0 7px 0 white, 0 14px 0 white;
    }
    .is-drilldown .menu-icon {
      color: white;
    }
    
    /* ----- 板块通用间距 ----- */
    section {
      padding: 5rem 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-alt);
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
      letter-spacing: -0.01em;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      max-width: 700px;
      margin: 0 auto 3rem auto;
    }
    
    /* ----- Hero 双栏 ----- */
    #hero {
      padding: 4rem 0 5rem;
      background: radial-gradient(circle at 20% 30%, rgba(168,85,247,0.08) 0%, transparent 60%);
    }
    .hero-content h1 {
      font-size: 3.8rem;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 1.5rem;
    }
    .gradient-text {
      background: linear-gradient(135deg, #A855F7, #06D6A0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 350px;
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.08);
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(168,85,247,0.2) 0%, rgba(6,214,160,0.1) 100%);
    }
    
    /* ----- 卡片通用样式 ----- */
    .card-custom {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-md);
      padding: 2rem;
      border: 1px solid var(--border-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }
    .icon-box {
      font-size: 2.8rem;
      color: var(--primary-purple);
      margin-bottom: 1.2rem;
    }
    
    /* ----- 案例瀑布流卡片 ----- */
    .case-card {
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-6px);
      border-color: rgba(168,85,247,0.4);
      box-shadow: 0 20px 35px rgba(0,0,0,0.7);
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-tag {
      background: rgba(168,85,247,0.2);
      color: var(--primary-purple);
      padding: 0.2rem 0.9rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 0.5rem;
    }
    
    /* ----- 方案对比卡片 ----- */
    .plan-card {
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-lg);
      padding: 2.2rem 1.8rem;
      border: 1px solid var(--border-light);
      transition: var(--transition-smooth);
      text-align: center;
    }
    .plan-featured {
      border-color: var(--primary-purple);
      box-shadow: 0 0 25px rgba(168,85,247,0.35);
      position: relative;
    }
    .plan-badge {
      background: var(--accent-gold);
      color: #000;
      font-weight: bold;
      padding: 0.25rem 1.2rem;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    
    /* ----- FAQ 手风琴覆盖 ----- */
    .accordion-title {
      background: rgba(255,255,255,0.02);
      border: 1px solid transparent;
      border-radius: 12px;
      color: var(--text-white);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1rem 1.5rem;
      transition: var(--transition-smooth);
    }
    .accordion-title:hover {
      background: rgba(168,85,247,0.08);
    }
    .is-active .accordion-title {
      border-color: var(--primary-purple);
      background: rgba(168,85,247,0.1);
      color: white;
    }
    .accordion-content {
      background: transparent;
      border: none;
      color: var(--text-body);
      padding: 0 1.5rem 1.2rem;
    }
    
    /* ----- CTA 区块 ----- */
    #cta {
      background: radial-gradient(ellipse at center, rgba(168,85,247,0.2) 0%, transparent 70%);
      background-color: #0B0C10;
    }
    
    /* ----- 页脚 ----- */
    #footer {
      background: var(--bg-footer);
      padding: 3rem 0 1.5rem;
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .footer-link {
      color: var(--text-muted);
      margin-bottom: 0.4rem;
      display: block;
    }
    .footer-link:hover {
      color: var(--primary-purple);
    }
    .social-icon {
      font-size: 1.4rem;
      color: var(--text-muted);
      margin-right: 1rem;
      transition: var(--transition-smooth);
    }
    .social-icon:hover {
      color: var(--primary-purple);
      transform: translateY(-2px);
    }
    
    /* ----- 响应式断点 ----- */
    @media screen and (max-width: 1024px) {
      .hero-content h1 {
        font-size: 2.8rem;
      }
      .section-title {
        font-size: 2rem;
      }
    }
    @media screen and (max-width: 768px) {
      .hero-image {
        min-height: 280px;
        margin-top: 2rem;
      }
      .card-custom, .plan-card {
        margin-bottom: 1.5rem;
      }
      .section-title {
        font-size: 1.9rem;
      }
    }
    @media screen and (max-width: 520px) {
      .hero-content h1 {
        font-size: 2.2rem;
      }
      .cta-btn-main {
        padding: 0.6rem 1.5rem;
        font-size: 0.9rem;
      }
    }