/* 通用：页面底子、版心、按钮、小标签、提示框。 */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--f-ui); font-size: 15px; line-height: 1.6;
  min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; }
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: var(--lapis); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--lapis); outline-offset: 2px; }

/* 版心：每个栏目的外框 */
.wrap {
  max-width: 92rem; margin: 0 auto;
  padding-block: 1.75rem 3rem;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  display: flex; flex-direction: column; gap: 1.1rem;
  width: 100%;
}

/* 栏目标题 */
.vh { margin: 0; font-family: var(--f-head); font-weight: 600; font-size: 1.75rem; letter-spacing: .06em; }
.sec-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; border-bottom: 2px solid var(--ink); padding-bottom: .35rem; }
.sec-head h2 { margin: 0; font-size: 1.1rem; letter-spacing: .08em; }
.sec-head .meta { font-size: .82rem; color: var(--ink-soft); }
.sec-head.plain { border: 0; padding: 0; justify-content: flex-start; }
.small { margin: 0; font-size: .8rem; color: var(--ink-soft); }
.backlink { font-size: .85rem; color: var(--ink-soft); text-decoration: none; }
.backlink:hover { color: var(--lapis); }

/* 按钮与分段按钮 */
.btn {
  font: inherit; font-size: .85rem; line-height: 1.3; padding: .4rem .75rem; cursor: pointer;
  border: 1px solid var(--rule); border-radius: 5px; background: var(--sheet); color: var(--ink);
}
.btn:hover { border-color: var(--lapis); }
.btn[aria-pressed="true"], .btn.primary { background: var(--lapis); border-color: var(--lapis); color: var(--sheet); }
a.btn { text-decoration: none; display: inline-block; }
.toolbar { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.seg { display: inline-flex; border: 1px solid var(--rule); border-radius: 6px; overflow: hidden; background: var(--sheet); }
.seg button { font: inherit; font-size: .85rem; padding: .4rem .8rem; border: 0; background: transparent; color: var(--ink); cursor: pointer; }
.seg button + button { border-left: 1px solid var(--rule); }
.seg button[aria-pressed="true"] { background: var(--lapis); color: var(--sheet); }

/* 语言小标签、空状态、提示 */
.lchips { display: inline-flex; gap: .3rem; flex-wrap: wrap; }
.lchip { font-size: .72rem; padding: 0 .45rem; border-radius: 999px; border: 1px solid var(--rule); color: var(--ink-soft); white-space: nowrap; }
.empty-box { padding: 1rem; border: 1px dashed var(--rule); border-radius: 6px; color: var(--ink-soft); font-size: .9rem; background: var(--sheet); }
.toast { position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(1rem + env(safe-area-inset-bottom, 0px)); background: var(--ink); color: var(--sheet); padding: .45rem .9rem; border-radius: 5px; font-size: .85rem; z-index: 20; }
/* 配置文件写错时页面顶上的提示 */
.problems { background: #fff3cd; color: #5c4400; border-bottom: 2px solid #e0b100; padding: .7rem max(16px, env(safe-area-inset-left, 0px)); font-size: .9rem; }
.problems ul { margin: .3rem 0 0; padding-left: 1.2rem; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }