/* roulang page: index */
:root {
      --deep-ink: #0B1A2E;
      --wine: #7B1E3B;
      --wine-dark: #5E152B;
      --ash: #F8F9FA;
      --cool-gray: #F0F2F5;
      --text-soft: #4A5568;
      --text-muted: #718096;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 10px 25px rgba(0,0,0,0.08);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
      line-height: 1.6;
      background-color: #F8F9FA;
      color: #1A202C;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    button {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 1024px) {
      .container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }

    /* 导航样式 */
    .nav-brand {
      font-weight: 700;
      font-size: 1.35rem;
      letter-spacing: 0.3px;
      color: var(--deep-ink);
      white-space: nowrap;
      transition: color 0.2s;
    }
    .nav-brand:hover {
      color: var(--wine);
    }
    .tab-pill {
      display: inline-flex;
      align-items: center;
      padding: 0.5rem 1rem;
      border-radius: 2rem;
      font-weight: 500;
      font-size: 0.9rem;
      color: var(--text-soft);
      background: transparent;
      transition: all 0.2s;
      white-space: nowrap;
    }
    .tab-pill:hover {
      background: rgba(123,30,59,0.06);
      color: var(--wine);
    }
    .tab-pill.active {
      background: rgba(123,30,59,0.12);
      color: var(--wine);
      font-weight: 600;
      border-bottom: 2px solid var(--wine);
      border-radius: 2rem 2rem 0 0;
    }
    .btn-primary {
      background-color: var(--wine);
      color: white;
      padding: 0.55rem 1.4rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
    }
    .btn-primary:hover {
      background-color: var(--wine-dark);
      transform: scale(1.02);
      box-shadow: 0 6px 16px rgba(123,30,59,0.25);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--deep-ink);
      color: var(--deep-ink);
      padding: 0.5rem 1.3rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: rgba(11,26,46,0.06);
      border-color: var(--wine);
      color: var(--wine);
    }

    /* 卡片样式 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      border: 1px solid rgba(0,0,0,0.03);
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-3px);
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--deep-ink);
      line-height: 1.2;
    }
    .stat-unit {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-left: 0.2rem;
    }

    /* 瀑布流卡片 */
    .masonry-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      border: 1px solid rgba(0,0,0,0.02);
      break-inside: avoid;
      margin-bottom: 1.5rem;
    }
    .masonry-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-2px);
    }
    .cover-tag {
      background: rgba(11,26,46,0.7);
      color: white;
      padding: 0.15rem 0.7rem;
      border-radius: 2rem;
      font-size: 0.75rem;
      font-weight: 600;
      backdrop-filter: blur(4px);
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid #E2E8F0;
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--deep-ink);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--wine);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--text-soft);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }
    .faq-item.open .faq-question {
      color: var(--wine);
    }
    .faq-icon {
      font-size: 1.5rem;
      transition: transform 0.3s;
      color: var(--wine);
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* 汉堡菜单 */
    @media (max-width: 768px) {
      .desktop-tabs {
        display: none;
      }
      .mobile-menu-btn {
        display: inline-flex;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        padding: 1rem;
        flex-direction: column;
        gap: 0.5rem;
        z-index: 50;
      }
      .mobile-menu.open {
        display: flex;
      }
    }
    @media (min-width: 769px) {
      .mobile-menu-btn, .mobile-menu {
        display: none;
      }
    }

    /* 响应式补充 */
    @media (max-width: 1024px) {
      .hero-right {
        margin-top: 2rem;
      }
    }