/* roulang page: index */
:root {
      --color-primary: #0F6B6B;
      --color-primary-hover: #0A5252;
      --color-secondary: #F4A261;
      --color-bg: #FAFAF7;
      --color-surface: #FFFFFF;
      --color-text-primary: #1E1E1E;
      --color-text-secondary: #5C5C5C;
      --color-border: #E8E8E2;
      --color-accent-glow: rgba(15, 107, 107, 0.12);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      background-color: var(--color-bg);
      color: var(--color-text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 2rem;
      padding-right: 2rem;
    }
    h1, h2, h3 {
      font-weight: 700;
      letter-spacing: -0.01em;
    }
    h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 1.25rem;
    }
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }
    .text-secondary {
      color: var(--color-text-secondary);
    }
    .btn-primary {
      background-color: var(--color-primary);
      color: white;
      padding: 0.875rem 2rem;
      border-radius: 9999px;
      font-weight: 600;
      letter-spacing: 0.02em;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px var(--color-accent-glow);
    }
    .btn-primary:hover {
      background-color: var(--color-primary-hover);
      box-shadow: 0 8px 20px var(--color-accent-glow);
      transform: scale(1.02);
    }
    .btn-outline {
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      padding: 0.875rem 2rem;
      border-radius: 9999px;
      font-weight: 600;
      letter-spacing: 0.02em;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent;
    }
    .btn-outline:hover {
      background-color: var(--color-primary);
      color: white;
    }
    .text-link {
      color: var(--color-primary);
      font-weight: 500;
      text-decoration: none;
      transition: all 0.2s;
    }
    .text-link:hover {
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    .card {
      background-color: var(--color-surface);
      border-radius: 16px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 32px rgba(0,0,0,0.08);
    }
    .badge {
      background-color: var(--color-secondary);
      color: white;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.03em;
    }
    .section-padding {
      padding: 6rem 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 4rem 0;
      }
      h2 {
        font-size: 1.8rem;
      }
    }
    .nav-blur {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(12px);
    }
    .nav-solid {
      background: white;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .mobile-menu {
      transition: transform 0.3s ease, opacity 0.3s ease;
    }
    .ripple {
      position: relative;
      overflow: hidden;
    }
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }