@layer travel-common {
  * {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    margin: 0;
    color: var(--ink);
    background:
      radial-gradient(circle at 12% 8%, var(--travel-bg-warm, rgba(198, 107, 53, 0.16)), transparent 28%),
      radial-gradient(circle at 88% 18%, var(--travel-bg-cool, rgba(219, 157, 78, 0.14)), transparent 30%),
      var(--paper);
    font-family: "Avenir Next", "Segoe UI", "Microsoft YaHei", sans-serif;
    line-height: 1.65;
  }

  header {
    --travel-header-padding-x: max(28px, calc((100vw - var(--travel-main-width, 1120px)) / 2 + 28px));
    padding: 34px var(--travel-header-padding-x) 22px;
    border-bottom: 1px solid var(--line);
    background: var(--travel-header-bg, rgba(255, 250, 242, 0.82));
    backdrop-filter: blur(10px);
  }

  main {
    max-width: var(--travel-main-width, 1120px);
    margin: 0 auto;
    padding: 28px;
  }

  h1 {
    margin: 0 0 10px;
    font-size: clamp(30px, 5vw, 52px);
    line-height: 1.05;
    letter-spacing: 0.02em;
  }

  h2 {
    margin: 0 0 12px;
    font-size: 24px;
  }

  h3 {
    margin: 18px 0 8px;
    font-size: 17px;
  }

  p {
    margin: 0 0 12px;
  }

  a {
    color: var(--accent);
    font-weight: 800;
    text-decoration: none;
  }

  a:hover {
    text-decoration: underline;
  }

  .subtitle {
    max-width: var(--travel-subtitle-width, 820px);
    margin: 0;
    color: var(--muted);
    font-size: 17px;
  }

  .page-tabs {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0;
    margin: 18px 0 0;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.7);
    box-shadow: var(--travel-shadow, var(--shadow, 0 10px 24px rgba(64, 55, 41, 0.08)));
  }

  .page-tabs a {
    min-height: 40px;
    padding: 8px 14px;
    border: 0;
    border-radius: 10px;
    color: var(--ink);
    background: transparent;
    font-weight: 800;
    text-decoration: none;
  }

  .page-tabs a:hover {
    text-decoration: underline;
  }

  .page-tabs a.active {
    color: #fff;
    background: var(--accent);
    border-color: var(--accent);
    box-shadow: var(--travel-active-shadow, 0 8px 18px rgba(169, 68, 36, 0.16));
  }

  .back-top {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 1100;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 52px;
    min-height: 44px;
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    background: var(--travel-float-bg, rgba(255, 250, 242, 0.92));
    box-shadow: var(--travel-float-shadow, 0 12px 28px rgba(87, 55, 31, 0.14));
    font-weight: 800;
  }

  .jump-menu {
    position: fixed;
    right: 18px;
    bottom: 72px;
    z-index: 1101;
    font-weight: 800;
  }

  .jump-menu summary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 58px;
    min-height: 44px;
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    background: var(--travel-menu-bg, rgba(255, 250, 242, 0.94));
    box-shadow: var(--travel-float-shadow, 0 12px 28px rgba(87, 55, 31, 0.14));
    cursor: pointer;
    list-style: none;
  }

  .jump-menu summary::-webkit-details-marker {
    display: none;
  }

  .jump-panel {
    position: absolute;
    right: 0;
    bottom: 54px;
    display: grid;
    gap: 4px;
    width: min(var(--travel-jump-width, 280px), calc(100vw - 24px));
    max-height: min(70vh, var(--travel-jump-max-height, 560px));
    overflow: auto;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--travel-panel-bg, rgba(255, 250, 242, 0.98));
    box-shadow: var(--travel-panel-shadow, 0 18px 44px rgba(87, 55, 31, 0.18));
  }

  .jump-panel a {
    padding: 7px 9px;
    border-radius: 10px;
    color: var(--ink);
    font-size: 14px;
    text-decoration: none;
  }

  .jump-panel a:hover {
    background: var(--travel-hover-bg, #f2e4d2);
    text-decoration: none;
  }

  .jump-divider {
    height: 1px;
    margin: 5px 0;
    background: var(--line);
  }

  @media (max-width: 820px) {
    main {
      padding: 18px;
    }
  }

  @media (max-width: 560px) {
    .page-tabs {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      width: 100%;
    }

    .page-tabs a {
      text-align: center;
    }

    .back-top {
      right: 12px;
      bottom: 12px;
    }

    .jump-menu {
      right: 12px;
      bottom: 66px;
    }
  }
}