/* ============================================================
   LemonBoss PRD/SDD doc site — global styles
   ============================================================ */

:root {
  --bg:           #fafaf7;
  --bg-2:         #ffffff;
  --bg-3:         #f3f3ee;
  --fg:           #1d1d1f;
  --fg-2:         #5a5a60;
  --fg-3:         #8a8a92;
  --border:       #e3e3dd;
  --border-2:     #d4d4cd;
  --accent:       #f5a524;   /* lemon */
  --accent-2:     #e69500;
  --accent-soft:  #fff4dc;
  --link:         #0a66c2;
  --code-bg:      #f5f5ef;
  --code-fg:      #2d2d33;
  --shadow:       0 1px 2px rgba(0,0,0,.04), 0 4px 12px rgba(0,0,0,.04);
  --shadow-lg:    0 12px 32px rgba(0,0,0,.08);
  --radius:       8px;
  --radius-sm:    4px;
  --side-w:       280px;
  --top-h:        52px;
  --mono:         ui-monospace, "SF Mono", Menlo, Consolas, "Roboto Mono", monospace;
  --sans:         -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                  "Hiragino Sans GB", "Microsoft YaHei", Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
  --bg:           #16161a;
  --bg-2:         #1d1d22;
  --bg-3:         #25252b;
  --fg:           #e8e8ea;
  --fg-2:         #b0b0b8;
  --fg-3:         #76767e;
  --border:       #2d2d34;
  --border-2:     #3a3a42;
  --accent:       #f5a524;
  --accent-2:     #ffbe3d;
  --accent-soft:  #3a2f15;
  --link:         #6db4ff;
  --code-bg:      #25252b;
  --code-fg:      #e6e6e8;
  --shadow:       0 1px 2px rgba(0,0,0,.4), 0 4px 12px rgba(0,0,0,.3);
  --shadow-lg:    0 12px 32px rgba(0,0,0,.6);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: var(--sans);
  font-size: 14px;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

button {
  background: none;
  border: none;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

/* ─── Topbar ─── */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--top-h);
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  z-index: 50;
}

.burger {
  display: none;
  padding: 6px;
  border-radius: var(--radius-sm);
  color: var(--fg-2);
}
.burger:hover { background: var(--bg-3); color: var(--fg); }

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--fg);
  flex-shrink: 0;
}
.brand .lemon { font-size: 20px; }
.brand .title { font-size: 15px; }
.brand .subtitle {
  font-size: 12px;
  font-weight: 400;
  color: var(--fg-3);
  margin-left: 6px;
  padding-left: 10px;
  border-left: 1px solid var(--border);
}

.search-wrap {
  flex: 1;
  max-width: 520px;
  margin: 0 auto;
  position: relative;
}
.search-wrap input {
  width: 100%;
  height: 32px;
  padding: 0 36px 0 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: var(--radius-sm);
  color: var(--fg);
  font-family: var(--sans);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.search-wrap input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.kbd {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-3);
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
  pointer-events: none;
}

.theme-toggle {
  padding: 6px;
  border-radius: var(--radius-sm);
  color: var(--fg-2);
}
.theme-toggle:hover { background: var(--bg-3); color: var(--fg); }
.theme-toggle .ico-moon { display: none; }
[data-theme="dark"] .theme-toggle .ico-sun  { display: none; }
[data-theme="dark"] .theme-toggle .ico-moon { display: block; }

/* ─── Layout ─── */
.layout {
  position: fixed;
  top: var(--top-h);
  left: 0; right: 0; bottom: 0;
  display: flex;
}

/* ─── Sidebar ─── */
.sidebar {
  width: var(--side-w);
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
}
.sidebar::-webkit-scrollbar { width: 8px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 4px; }

.menu { padding: 8px 0; }
.menu-chapter { margin-bottom: 2px; }
.menu-chapter > .menu-link {
  font-weight: 600;
  color: var(--fg);
}
.menu-section > .menu-link {
  font-weight: 500;
  color: var(--fg-2);
  padding-left: 28px;
}
.menu-sub > .menu-link {
  font-weight: 400;
  color: var(--fg-3);
  padding-left: 44px;
  font-size: 13px;
}

.menu-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  cursor: pointer;
  text-decoration: none;
  user-select: none;
  border-radius: 4px;
  margin: 1px 6px;
  transition: background .12s;
  line-height: 1.4;
}
.menu-link:hover {
  background: var(--bg-3);
  text-decoration: none;
}
.menu-link.active {
  background: var(--accent-soft);
  color: var(--accent-2);
  font-weight: 600;
}
[data-theme="dark"] .menu-link.active { color: var(--accent); }

.caret {
  width: 12px;
  text-align: center;
  font-size: 10px;
  color: var(--fg-3);
  flex-shrink: 0;
  transition: transform .15s;
}
.menu-chapter.collapsed > .menu-link .caret,
.menu-section.collapsed > .menu-link .caret {
  transform: rotate(-90deg);
}

.menu-chapter > .children,
.menu-section > .children {
  overflow: hidden;
  max-height: 4000px;
  transition: max-height .2s ease-out;
}
.menu-chapter.collapsed > .children,
.menu-section.collapsed > .children {
  max-height: 0;
}

.menu-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-3);
  margin-right: 4px;
  flex-shrink: 0;
}
.menu-link.active .menu-num { color: var(--accent-2); }

/* ─── Content ─── */
.content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  min-width: 0;
}

.tabs {
  height: 36px;
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
  padding: 0 12px;
  gap: 4px;
  flex-shrink: 0;
}
.tab {
  padding: 0 14px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 6px;
  border-bottom: 2px solid transparent;
  color: var(--fg-2);
  font-size: 13px;
  transition: color .12s, border-color .12s;
}
.tab:hover { color: var(--fg); }
.tab.active {
  color: var(--accent-2);
  border-bottom-color: var(--accent);
  font-weight: 500;
}
[data-theme="dark"] .tab.active { color: var(--accent); }
.tab .badge {
  background: var(--bg-3);
  color: var(--fg-3);
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 9px;
  font-family: var(--mono);
}
.tab.active .badge {
  background: var(--accent);
  color: #fff;
}

.pane {
  display: none;
  flex: 1;
  overflow: hidden;
}
.pane.active { display: flex; flex-direction: column; }

.pane-reader iframe {
  flex: 1;
  width: 100%;
  border: none;
  background: var(--bg);
}

/* ─── Search results pane ─── */
.search-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
  color: var(--fg-2);
  font-size: 13px;
}
.clear-btn {
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  color: var(--fg-2);
  font-size: 12px;
}
.clear-btn:hover { background: var(--bg-3); color: var(--fg); }

.results {
  list-style: none;
  margin: 0;
  padding: 8px 0;
  overflow-y: auto;
  flex: 1;
}
.result-item {
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background .1s;
}
.result-item:hover { background: var(--bg-3); }
.result-path {
  font-size: 11px;
  color: var(--fg-3);
  font-family: var(--mono);
  margin-bottom: 4px;
}
.result-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 4px;
}
.result-snippet {
  font-size: 12px;
  color: var(--fg-2);
  line-height: 1.5;
}
.result-snippet mark {
  background: var(--accent-soft);
  color: var(--accent-2);
  padding: 0 2px;
  border-radius: 2px;
  font-weight: 600;
}
[data-theme="dark"] .result-snippet mark { color: var(--accent); }

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .burger { display: flex; }
  .brand .subtitle { display: none; }
  .sidebar {
    position: fixed;
    left: 0; top: var(--top-h); bottom: 0;
    z-index: 40;
    transform: translateX(-100%);
    transition: transform .2s;
    box-shadow: var(--shadow-lg);
  }
  body.sidebar-open .sidebar { transform: translateX(0); }
  .search-wrap { max-width: none; }
}