/* roulang page: index */
:root {
      --charcoal: #1E1E24;
      --amber: #E5A43C;
      --sage: #7C9082;
      --warm: #FAF9F6;
      --soft: #F0EFEA;
      --body: #4A4A54;
      --muted: #8A8A94;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
    }
    *, *::before, *::after {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      color: var(--body);
      background-color: var(--warm);
      line-height: 1.75;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3 {
      color: var(--charcoal);
    }
    a, button, input {
      font-family: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 2rem;
      padding-right: 2rem;
    }
    @media (max-width: 768px) {
      .container-main {
        padding-left: 1.25rem;
        padding-right: 1.25rem;
      }
    }
    /* 浮动导航 Dock */
    .nav-dock {
      position: fixed;
      top: 1.5rem;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 90vw;
      background: rgba(250, 249, 246, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: 40px;
      padding: 0.6rem 1.8rem;
      box-shadow: 0 10px 25px -8px rgba(0,0,0,0.08);
      z-index: 50;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 2rem;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--charcoal);
      letter-spacing: -0.01em;
      white-space: nowrap;
    }
    .nav-logo span {
      color: var(--amber);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 1.75rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--body);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--amber);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--amber);
      border-radius: 2px;
    }
    .btn-primary {
      background: var(--amber);
      color: var(--charcoal);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: 999px;
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      display: inline-block;
      text-decoration: none;
      font-size: 0.95rem;
      box-shadow: 0 4px 12px rgba(229,164,60,0.25);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: #d4952f;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(229,164,60,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--amber);
      color: var(--amber);
      font-weight: 600;
      padding: 0.7rem 1.9rem;
      border-radius: 999px;
      cursor: pointer;
      transition: all 0.25s;
      text-decoration: none;
      display: inline-block;
      font-size: 0.95rem;
    }
    .btn-outline:hover {
      background: rgba(229,164,60,0.08);
      transform: translateY(-2px);
    }
    /* 汉堡菜单 */
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--charcoal);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-dock {
        width: 92%;
        padding: 0.5rem 1.2rem;
        gap: 1rem;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .nav-dock .btn-primary {
        display: none;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(30,30,36,0.95);
        backdrop-filter: blur(20px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        z-index: 60;
        transform: translateX(100%);
        transition: transform 0.3s ease;
      }
      .mobile-menu.open {
        transform: translateX(0);
      }
      .mobile-menu a {
        color: white;
        font-size: 1.5rem;
        font-weight: 500;
        text-decoration: none;
      }
      .close-menu {
        position: absolute;
        top: 2rem;
        right: 2rem;
        background: none;
        border: none;
        color: white;
        font-size: 2rem;
        cursor: pointer;
      }
    }
    .section-padding {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding-top: 3rem;
        padding-bottom: 3rem;
      }
    }
    .card-hover {
      transition: box-shadow 0.3s, transform 0.2s, border-color 0.2s;
    }
    .card-hover:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: rgba(229,164,60,0.4);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: #e9f0eb;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--sage);
      font-size: 1.4rem;
    }
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.06);
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      padding: 1.2rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s;
      color: var(--body);
      padding-left: 0.5rem;
      border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0.8rem 0 1.2rem 1rem;
      border-left-color: var(--sage);
    }