/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-deep: #0B0E17;
      --accent-cyan: #00F0B5;
      --highlight-purple: #7B2FFF;
      --bg-light: #F5F3FF;
      --text-dark: #1A1A2E;
      --text-white: #FFFFFF;
      --text-muted: rgba(255,255,255,0.7);
      --border-soft: #E0DCF0;
      --card-shadow: 0 4px 24px rgba(11,14,23,0.08);
      --card-hover-shadow: 0 8px 32px rgba(123,47,255,0.15);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-btn: 20px;
      --font-heading: 'Inter', sans-serif;
      --font-body: 'Inter', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition: 0.2s ease;
    }
    
    /* ----- 基础重置与全局 ----- */
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: #FFFFFF;
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      letter-spacing: -0.02em;
      margin: 0;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 640px) {
      .section-padding {
        padding: 60px 0;
      }
    }
    
    /* ----- 导航 (SaaS 命令栏) ----- */
    .geek-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11,14,23,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(123,47,255,0.3);
      z-index: 1000;
      padding: 12px 0;
      transition: all 0.3s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .nav-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      color: #FFFFFF;
      font-weight: 800;
      font-size: 20px;
      letter-spacing: -0.02em;
      white-space: nowrap;
    }
    .nav-logo .logo-diamond {
      width: 12px;
      height: 12px;
      background: var(--accent-cyan);
      transform: rotate(45deg);
      display: inline-block;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-right {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .search-box {
      background: rgba(255,255,255,0.08);
      border: none;
      border-radius: 20px;
      padding: 8px 16px;
      color: white;
      font-size: 14px;
      width: 160px;
      transition: width 0.25s ease;
      outline: none;
      font-family: var(--font-body);
    }
    .search-box::placeholder {
      color: rgba(255,255,255,0.5);
    }
    .search-box:focus {
      width: 220px;
      background: rgba(255,255,255,0.15);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-cyan), var(--highlight-purple));
      color: white;
      font-weight: 600;
      padding: 8px 20px;
      border-radius: 20px;
      font-size: 14px;
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      white-space: nowrap;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--highlight-purple), var(--accent-cyan));
      transform: scale(1.03);
      color: white;
    }
    /* 移动端汉堡菜单 */
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
    }
    @media (max-width: 840px) {
      .nav-links, .nav-right .search-box {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-right {
        gap: 8px;
      }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: rgba(11,14,23,0.98);
        padding: 20px;
        gap: 16px;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        backdrop-filter: blur(16px);
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        color: white;
        font-size: 16px;
      }
    }
    
    /* ----- Hero 双栏杂志分栏 ----- */
    #hero {
      background: linear-gradient(135deg, #0B0E17 0%, #1A1040 100%);
      padding: 140px 0 80px;
      color: white;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 0 0 58%;
    }
    .hero-right {
      flex: 0 0 38%;
      position: relative;
    }
    .hero-right img {
      border-radius: 20px;
      width: 100%;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .floating-badge {
      position: absolute;
      bottom: -15px;
      right: -15px;
      background: rgba(0,240,181,0.15);
      backdrop-filter: blur(8px);
      color: var(--accent-cyan);
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      border: 1px solid var(--accent-cyan);
    }
    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 12px 28px;
      border-radius: 20px;
      font-weight: 600;
      transition: 0.25s;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(0,240,181,0.1);
      color: var(--accent-cyan);
    }
    .stats-row {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .stat-badge {
      background: rgba(0,240,181,0.12);
      padding: 10px 18px;
      border-radius: 30px;
      color: var(--accent-cyan);
      font-family: var(--font-mono);
      font-weight: 600;
      font-size: 16px;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .stat-badge small {
      font-family: var(--font-body);
      font-weight: 400;
      font-size: 13px;
      color: rgba(255,255,255,0.8);
    }
    @media (max-width: 840px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: auto;
        width: 100%;
      }
      .hero-title {
        font-size: 32px;
      }
      .hero-right {
        margin-top: 30px;
      }
    }
    
    /* ----- 核心优势网格 2x3 ----- */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s;
      border: 1px solid transparent;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(123,47,255,0.3);
    }
    .adv-icon {
      font-size: 32px;
      color: var(--highlight-purple);
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .adv-desc {
      color: #555;
      margin-bottom: 14px;
      font-size: 15px;
    }
    .adv-metric {
      font-family: var(--font-mono);
      color: var(--accent-cyan);
      font-weight: 600;
      background: #f0fdf9;
      display: inline-block;
      padding: 4px 12px;
      border-radius: 20px;
    }
    @media (max-width: 840px) {
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* ----- 产品瀑布流 ----- */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .product-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: 0.3s;
      display: flex;
      flex-direction: column;
      height: fit-content;
    }
    .product-card:hover {
      box-shadow: var(--card-hover-shadow);
    }
    .product-card img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-top-left-radius: var(--radius-lg);
      border-top-right-radius: var(--radius-lg);
    }
    .product-info {
      padding: 20px;
    }
    .tag {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin: 8px 0 10px;
      font-weight: 600;
    }
    .text-link {
      color: var(--accent-cyan);
      font-weight: 600;
      margin-top: 10px;
      display: inline-block;
    }
    .text-link:hover {
      text-decoration: underline;
    }
    @media (max-width: 840px) {
      .product-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .product-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* ----- 方案对比 ----- */
    .compare-row {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      flex: 1;
      box-shadow: var(--card-shadow);
    }
    .vs-badge {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, var(--accent-cyan), var(--highlight-purple));
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 18px;
    }
    .feature-item {
      display: flex;
      align-items: center;
      gap: 10px;
      margin: 14px 0;
    }
    @media (max-width: 640px) {
      .compare-row {
        flex-direction: column;
      }
      .vs-badge {
        margin: 10px 0;
      }
    }
    
    /* ----- FAQ Accordion 覆盖 ----- */
    .accordion-title {
      background: #F5F3FF;
      border-radius: var(--radius-sm);
      padding: 16px 20px;
      font-weight: 600;
      border: 1px solid transparent;
    }
    .accordion-title:hover {
      border-color: var(--highlight-purple);
    }
    .is-active .accordion-title {
      background: #ede7ff;
      color: var(--highlight-purple);
    }
    .accordion-content {
      padding: 20px;
      background: white;
      border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    }
    
    /* ----- CTA 横幅 ----- */
    .cta-banner {
      background: linear-gradient(90deg, #7B2FFF, #00F0B5);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    
    /* ----- 页脚 ----- */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.2);
      margin-top: 30px;
      padding-top: 20px;
      text-align: center;
      font-size: 12px;
      color: rgba(255,255,255,0.5);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }