/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --secondary: #E6B422;
      --primary-light: #2D2D4A;
      --primary-dark: #16213E;
      --bg-light: #F7F7F9;
      --text-light: #4A4A5A;
      --border-light: rgba(0,0,0,0.06);
      --border-dark: rgba(255,255,255,0.08);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      line-height: 1.75;
      background: #FFFFFF;
      color: #1A1A2E;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a, button, input, select, textarea {
      outline: none;
    }
    a:focus-visible, button:focus-visible, input:focus-visible {
      outline: 2px solid var(--secondary);
      outline-offset: 2px;
      border-radius: 4px;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 16px;
      padding-right: 16px;
    }
    @media (min-width: 640px) {
      .container {
        padding-left: 24px;
        padding-right: 24px;
      }
    }
    @media (min-width: 1024px) {
      .container {
        padding-left: 32px;
        padding-right: 32px;
      }
    }

    /* 导航样式 */
    .nav-blur {
      backdrop-filter: blur(12px);
      background: rgba(26, 26, 46, 0.85);
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    }
    .nav-chip {
      transition: all 0.2s ease;
      white-space: nowrap;
    }
    .nav-chip-active {
      background: var(--secondary);
      color: var(--primary);
    }
    .nav-chip-inactive {
      color: rgba(255,255,255,0.7);
    }
    .nav-chip-inactive:hover {
      color: #FFFFFF;
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    .btn-primary {
      background: var(--secondary);
      color: var(--primary);
      border-radius: 9999px;
      font-weight: 600;
      padding: 0.75rem 2rem;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(230, 180, 34, 0.25);
    }
    .btn-primary:hover {
      filter: brightness(0.9);
      transform: scale(1.02);
      box-shadow: 0 6px 16px rgba(230, 180, 34, 0.35);
    }
    .btn-outline {
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      background: transparent;
      border-radius: 9999px;
      font-weight: 600;
      padding: 0.75rem 2rem;
      transition: all 0.25s ease;
    }
    .btn-outline:hover {
      background: rgba(230, 180, 34, 0.1);
    }
    .btn-cta-large {
      background: #FFFFFF;
      color: var(--primary);
      border-radius: 9999px;
      font-weight: 600;
      padding: 1rem 2.5rem;
      font-size: 1.125rem;
      transition: all 0.25s ease;
      box-shadow: 0 6px 18px rgba(0,0,0,0.1);
    }
    .btn-cta-large:hover {
      background: var(--primary);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(0,0,0,0.15);
    }

    /* 区块间距 */
    .section-padding {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    @media (min-width: 768px) {
      .section-padding {
        padding-top: 7rem;
        padding-bottom: 7rem;
      }
    }

    /* 卡片 */
    .solution-card {
      background: #F7F7F9;
      border-radius: 16px;
      padding: 2rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
      transition: all 0.25s ease;
      cursor: pointer;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
      background: #FFFFFF;
      border: 1px solid rgba(0,0,0,0.04);
    }

    /* 证言卡片 */
    .testimonial-scroll {
      display: flex;
      overflow-x: auto;
      gap: 1.5rem;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      padding-bottom: 0.5rem;
    }
    .testimonial-scroll::-webkit-scrollbar {
      display: none;
    }
    .testimonial-card {
      flex: 0 0 85%;
      background: #FFFFFF;
      border-radius: 16px;
      padding: 2rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
      scroll-snap-align: start;
      position: relative;
    }
    @media (min-width: 768px) {
      .testimonial-card {
        flex: 0 0 45%;
      }
      .testimonial-scroll {
        gap: 2rem;
      }
    }
    @media (min-width: 1024px) {
      .testimonial-card {
        flex: 0 0 40%;
      }
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.25rem 0;
      transition: all 0.2s;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      color: var(--primary);
    }
    .faq-question:hover {
      background: #F9FAFB;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--text-light);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 0.75rem;
    }
    .faq-icon {
      font-size: 1.5rem;
      color: var(--secondary);
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 粒子动画 (纯CSS) */
    .particle {
      position: absolute;
      width: 2px;
      height: 2px;
      background: rgba(255,255,255,0.6);
      border-radius: 50%;
      animation: float 8s infinite ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0px) scale(1); opacity: 0.4; }
      50% { transform: translateY(-30px) scale(1.5); opacity: 0.8; }
      100% { transform: translateY(0px) scale(1); opacity: 0.4; }
    }
    .particle:nth-child(2) { left: 20%; animation-delay: 2s; }
    .particle:nth-child(3) { left: 45%; animation-delay: 4s; }
    .particle:nth-child(4) { left: 70%; animation-delay: 1s; }
    .particle:nth-child(5) { left: 85%; animation-delay: 5s; }