/* roulang page: index */
:root {
      --primary: #5B2D8E;
      --secondary: #00B4D8;
      --gradient-start: #5B2D8E;
      --gradient-end: #00B4D8;
      --accent: #FF6B35;
      --deep-bg: #1E1B2E;
      --surface: #FAF9FC;
      --white: #FFFFFF;
      --text-primary: #1E1B2E;
      --text-secondary: #5A5672;
      --border-light: rgba(91,45,142,0.08);
      --shadow-card: 0 2px 16px rgba(91,45,142,0.06);
      --shadow-hover: 0 8px 32px rgba(91,45,142,0.12);
      --radius-lg: 20px;
      --radius-card: 16px;
      --radius-btn: 50px;
      --font-sans: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--surface);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .grid-container {
      max-width: 1200px;
    }

    /* 顶部信息条 */
    .top-bar {
      background: var(--deep-bg);
      color: #ccc;
      font-size: 0.8125rem;
      height: 36px;
      line-height: 36px;
    }
    .top-bar a {
      color: #ddd;
      text-decoration: underline;
      text-underline-offset: 2px;
    }
    .top-bar a:hover {
      color: #fff;
    }

    /* 主导航 */
    .main-nav {
      background: #fff;
      height: 64px;
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 50;
    }
    .main-nav .logo {
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 1.8rem;
      color: var(--primary);
      background: none;
      -webkit-text-fill-color: initial;
      background-clip: unset;
    }
    .nav-links a {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-primary);
      margin-left: 2rem;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    /* 移动端导航 */
    .off-canvas-content {
      background: var(--surface);
    }
    .menu-icon {
      color: var(--primary);
    }
    .off-canvas .nav-links a {
      display: block;
      padding: 12px 20px;
      margin: 0;
      border-bottom: 1px solid var(--border-light);
    }

    /* Hero */
    .hero {
      min-height: 85vh;
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      color: #fff;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: radial-gradient(rgba(255,255,255,0.08) 1px, transparent 1px);
      background-size: 24px 24px;
      pointer-events: none;
    }
    .hero h1 {
      font-size: 2.75rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      opacity: 0.9;
      margin: 1.5rem 0 2rem;
    }
    .hero-img {
      border-radius: var(--radius-lg);
      box-shadow: 0 25px 50px rgba(0,0,0,0.25);
      transform: rotate(2deg);
      transition: transform 0.3s ease;
    }
    .hero-img:hover {
      transform: rotate(0deg);
    }

    .btn {
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      text-align: center;
      transition: var(--transition);
      border: 2px solid transparent;
    }
    .btn-primary {
      background: #fff;
      color: var(--primary);
      border-color: #fff;
    }
    .btn-primary:hover {
      background: rgba(255,255,255,0.9);
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
      color: var(--primary);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #fff;
      color: #fff;
    }
    .btn-outline:hover {
      background: #fff;
      color: var(--primary);
    }
    .btn-gradient {
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
      color: #fff;
      border: none;
    }
    .btn-gradient:hover {
      box-shadow: 0 4px 20px rgba(91,45,142,0.3);
      filter: brightness(1.05);
      color: #fff;
    }

    /* 板块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }
    .section-sub {
      color: var(--text-secondary);
    }

    /* 卡片系统 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: var(--transition);
      height: 100%;
      position: relative;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(91,45,142,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      color: var(--primary);
    }
    .badge {
      background: var(--accent);
      color: #fff;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 0.75rem;
      font-weight: 600;
      position: absolute;
      top: 16px;
      right: 16px;
    }

    /* 功能分组图 */
    .feature-img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }

    /* 案例卡片左侧装饰 */
    .case-card {
      border-left: 4px solid var(--primary);
    }

    /* 价格卡片高亮 */
    .pricing-highlight {
      border: 2px solid var(--primary);
      background: linear-gradient(white, rgba(91,45,142,0.02));
    }
    .price-tag {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
    }

    /* FAQ */
    .accordion-title {
      font-size: 1.0625rem;
      font-weight: 600;
      background: #fff;
      border-radius: 12px;
      padding: 16px 24px;
      border: 1px solid var(--border-light);
    }
    .accordion-content {
      background: var(--surface);
      padding: 16px 24px;
      color: var(--text-secondary);
    }

    /* CTA 尾板 */
    .cta-footer {
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
      padding: 80px 0;
    }

    /* 页脚 */
    .site-footer {
      background: var(--deep-bg);
      color: #aaa;
      padding: 60px 0 20px;
    }
    .site-footer a:hover {
      color: #fff;
    }
    .footer-links a {
      display: block;
      margin-bottom: 6px;
      color: #aaa;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero h1 {
        font-size: 2.2rem;
      }
    }
    @media (max-width: 640px) {
      .hero {
        min-height: auto;
        padding: 60px 0;
        text-align: center;
      }
      .hero h1 {
        font-size: 1.8rem;
      }
      .hero-img {
        transform: none;
        margin-top: 2rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
    }