/* 5z 规则站 — 应用壳样式 */
:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #7c3aed;
  --accent-soft: #f3e8ff;
  --hover: #f1f5f9;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08);
}
[data-theme="dark"] {
  --bg: #0f172a;
  --panel: #1e293b;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #a78bfa;
  --accent-soft: #312e81;
  --hover: #334155;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
}
#app { display: flex; height: 100vh; overflow: hidden; }

/* ---------- 侧栏 ---------- */
#sidebar {
  width: 320px;
  min-width: 320px;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-right: 1px solid var(--border);
  z-index: 30;
}
.side-head {
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--border);
}
.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1px;
}
.version { font-size: 12px; color: var(--muted); margin: 2px 0 10px; }
.search-box { position: relative; }
#q {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
}
#q:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124, 58, 237, .15); }
.search-options {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
  flex-wrap: wrap;
}
.opt-label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  white-space: nowrap;
}
.opt-label input { accent-color: var(--accent); }
.opt-select {
  padding: 4px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 12px;
  flex: 1;
  min-width: 0;
}
.opt-btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
}
.opt-btn:hover { background: var(--hover); }
.opt-btn.on { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
/* 页内搜索条 */
#page-search-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex: none;
}
#page-search-bar[hidden] { display: none; }
#ps-q {
  flex: 1;
  min-width: 0;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
}
#ps-q:focus { border-color: var(--accent); }
#ps-prev, #ps-next, #ps-close {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  width: 38px;
  height: 36px;
  cursor: pointer;
  font-size: 15px;
  flex: none;
}
#ps-prev:hover, #ps-next:hover, #ps-close:hover { background: var(--hover); }
#ps-count {
  min-width: 58px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  flex: none;
  white-space: nowrap;
}
#results .res-rank {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 1px 7px;
  margin-left: 6px;
  vertical-align: 1px;
  white-space: nowrap;
}
#results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  max-height: 60vh;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .18);
  z-index: 50;
}
#results .res-item {
  display: block;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
}
#results .res-item:last-child { border-bottom: none; }
#results .res-item:hover, #results .res-item.selected { background: var(--hover); }
#results .res-item.selected { border-left: 3px solid var(--accent); padding-left: 9px; }
#results .res-title { font-size: 13px; font-weight: 600; line-height: 1.5; }
#results .res-snip {
  font-size: 12px;
  color: var(--muted);
  margin-top: 3px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
#results .res-meta { font-size: 11px; color: var(--muted); margin-top: 2px; opacity: .75; }
#results .res-empty { padding: 12px; font-size: 13px; color: var(--muted); }
#results .res-flag { position: sticky; top: 0; padding: 4px 12px; font-size: 11px; color: var(--muted); background: var(--panel); border-bottom: 1px solid var(--border); z-index: 1; }
#results mark {
  background: #fde047;
  color: #000;
  border-radius: 2px;
  padding: 0 1px;
}

/* ---------- 目录树 ---------- */
#toc { flex: 1; overflow-y: auto; padding: 8px; }
.toc-node { user-select: none; }
.toc-row {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px 6px;
  border-radius: 6px;
  font-size: 13.5px;
  line-height: 1.9;
  cursor: pointer;
}
.toc-row:hover { background: var(--hover); }
.toc-row .tw { width: 18px; flex: none; text-align: center; color: var(--muted); font-size: 10px; }
.toc-row .tlabel { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.toc-row.branch > .tlabel { font-weight: 500; }
.toc-row.leaf > .tlabel { color: var(--text); }
.toc-row a.tlabel {
  text-decoration: none;
  color: inherit;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.toc-row.active { background: var(--accent-soft); }
.toc-row.active .tlabel { color: var(--accent); font-weight: 600; }
.toc-children { margin-left: 12px; border-left: 1px dashed var(--border); padding-left: 4px; }

/* ---------- 主区 ---------- */
#main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
#topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
  height: 44px;
  flex: none;
}
#crumb { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#crumb b { color: var(--text); font-weight: 600; }
#menu-btn, #theme-btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  width: 30px;
  height: 30px;
  cursor: pointer;
  font-size: 15px;
  flex: none;
}
#menu-btn:hover, #theme-btn:hover { background: var(--hover); }
#menu-btn { display: none; }
#frame { flex: 1; width: 100%; border: none; background: #fff; }
#mask { display: none; }

/* ---------- 移动端 ---------- */
@media (max-width: 860px) {
  #sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(85vw, 340px);
    transform: translateX(-100%);
    transition: transform .22s ease;
    box-shadow: 4px 0 24px rgba(0,0,0,.25);
  }
  body.nav-open #sidebar { transform: translateX(0); }
  body.nav-open #mask {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, .45);
    z-index: 20;
  }
  #menu-btn { display: block; }
  #results { max-height: 50vh; }
}