/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-dark: #0F2822;
      --accent: #E87722;
      --accent-hover: #C85D1A;
      --bg-light: #F7F5F2;
      --text-dark: #1E1E1E;
      --text-mid: #5C5C5C;
      --text-light: #F0EDE8;
      --border-soft: #D9DDD8;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 12px 28px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 640px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    /* 导航胶囊 */
    .nav-capsule {
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      box-shadow: 0 8px 28px rgba(0,0,0,0.06);
      border-radius: 100px;
      padding: 0.75rem 1.8rem;
      transition: all 0.3s ease;
    }
    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--primary);
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-primary {
      background-color: var(--accent);
      color: white;
      border-radius: var(--radius-sm);
      padding: 0.6rem 1.6rem;
      font-weight: 600;
      transition: all 0.2s ease-in-out;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(232,119,34,0.2);
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(232,119,34,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-sm);
      padding: 0.55rem 1.6rem;
      font-weight: 600;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-light {
      border: 2px solid white;
      color: white;
      background: transparent;
      border-radius: var(--radius-sm);
      padding: 0.55rem 1.8rem;
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-light:hover {
      background: white;
      color: var(--primary);
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.25;
      margin-bottom: 0.75rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 60px;
      height: 3px;
      background: var(--accent);
      border-radius: 4px;
    }
    @media (min-width: 768px) {
      .section-title {
        font-size: 2.8rem;
      }
    }
    .card-hover {
      transition: all 0.3s ease;
      background: white;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--accent);
    }
    .deep-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.18);
      border-radius: var(--radius-md);
    }
    .accordion-btn {
      background: white;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-sm);
      padding: 1rem 1.5rem;
      font-weight: 600;
      text-align: left;
      width: 100%;
      transition: background 0.2s;
    }
    .accordion-btn.active {
      background: #F0EDE8;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F7F5F2;
      border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 1rem 1.5rem;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(232,119,34,0.25);
    }
    .hamburger-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav-links {
        display: none;
      }
      .hamburger-menu {
        display: block;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 20px;
        right: 20px;
        background: rgba(255,255,255,0.96);
        backdrop-filter: blur(16px);
        border-radius: 28px;
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        padding: 1.8rem;
        flex-direction: column;
        gap: 1.2rem;
        z-index: 100;
      }
      .mobile-menu.active {
        display: flex;
      }
    }