:root {
  color-scheme: dark;
  --bg: #121417;
  --surface: #1b1e23;
  --surface2: #242830;
  --border: #2f343d;
  --text: #e4e6eb;
  --muted: #9aa1ac;
  --accent: #5b9dff;
  --accent-soft: rgba(91, 157, 255, .18);
  --danger: #ff6b6b;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface2: #eef0f3;
  --border: #d9dde3;
  --text: #1d2129;
  --muted: #5f6773;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, .12);
  --danger: #d93025;
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

[hidden] { display: none !important; }

.bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

h1 { font-size: 18px; margin: 0; }

h1 a { color: inherit; text-decoration: none; }

h1 a:hover { color: var(--accent); }

main {
  flex: 1;
  width: 100%;
  max-width: var(--page-width, 880px);
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--muted);
}

select, input, textarea, button, .btn {
  font: inherit;
  font-size: 16px;
  color: var(--text);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  min-width: 0;
}

select:focus, input:focus, textarea:focus, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

textarea { width: 100%; resize: vertical; }

input[type="range"] {
  padding: 0;
  border: 0;
  background: none;
  accent-color: var(--accent);
}

.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 14px; }

button, .btn { cursor: pointer; white-space: nowrap; }

button:hover, .btn:hover { border-color: var(--accent); }

.btn { display: inline-flex; flex-direction: row; align-items: center; }

.primary { background: var(--accent); border-color: var(--accent); color: #fff; }

.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.row > select, .row > input { flex: 1 1 160px; }

.tabs { display: flex; gap: 6px; }

.tabs button { flex: 1; }

.tabs button.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

.msg { font-size: 13px; color: var(--muted); min-height: 1.2em; }

.msg.err { color: var(--danger); }

.warn {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--danger);
  color: var(--danger);
}

.reader { flex: 1; padding-bottom: 24px; }

.reader .empty { color: var(--muted); text-align: center; padding: 40px 0; }

.line {
  margin: 0;
  padding: 6px 10px;
  border-left: 3px solid transparent;
  border-radius: 6px;
  font-size: var(--read-size, 18px);
  line-height: var(--read-lh, 1.8);
  cursor: pointer;
  scroll-margin: 80px 0 140px;
  transition: background-color .15s;
}

.line:hover { background: var(--surface2); }

.line.title { font-size: calc(var(--read-size, 18px) + 2px); font-weight: 600; margin-top: 8px; }

.line.active { background: var(--accent-soft); border-left-color: var(--accent); }

.controls {
  position: sticky;
  bottom: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.controls .inner {
  width: 100%;
  max-width: var(--page-width, 880px);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

#chapterSel { flex: 1 1 200px; }

.buttons { display: flex; gap: 6px; margin-left: auto; }

.buttons button { min-width: 44px; }

.buttons button, .icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
}

.buttons svg, .icon-btn svg { display: block; }

.tip { position: relative; }

.tip::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translate(-50%, 4px);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--text);
  background: var(--surface2);
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, .25);
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s, transform .15s;
}

#nextLine::after, #nextCh::after, #bookmarkBtn::after { left: auto; right: 0; transform: translateY(4px); }

.tip:focus-visible::after { opacity: 1; transform: translate(-50%, 0); }

#nextLine:focus-visible::after, #nextCh:focus-visible::after, #bookmarkBtn:focus-visible::after { transform: translateY(0); }

@media (hover: hover) {
  .tip:hover::after { opacity: 1; transform: translate(-50%, 0); }
  #nextLine:hover::after, #nextCh:hover::after, #bookmarkBtn:hover::after { transform: translateY(0); }
}

.status { width: 100%; max-width: var(--page-width, 880px); font-size: 13px; color: var(--muted); }

.line.skipped { opacity: .45; text-decoration: line-through; }

.line.marked { box-shadow: inset -3px 0 0 var(--accent); }

#bookmarkBtn.on { color: var(--accent); border-color: var(--accent); }

#bookmarkBtn.on svg { fill: currentColor; }

.check { flex-direction: row; align-items: center; gap: 8px; font-size: 15px; color: var(--text); cursor: pointer; }

.check input { width: 18px; height: 18px; margin: 0; accent-color: var(--accent); }

.fold { display: block; padding: 0; }

.fold > summary {
  padding: 12px;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.fold > summary::-webkit-details-marker { display: none; }

.fold > summary::before {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform .15s;
}

.fold[open] > summary::before { transform: rotate(45deg); }

.fold > .body { padding: 0 12px 12px; display: flex; flex-direction: column; gap: 10px; }

.results {
  margin: 0;
  padding: 0;
  list-style: none;
  max-height: 320px;
  overflow-y: auto;
  border-radius: 8px;
}

.results li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-top: 1px solid var(--border);
  cursor: pointer;
}

.results li:first-child { border-top: 0; }

.results li:hover { background: var(--surface2); }

.results .meta { font-size: 12px; color: var(--muted); }

.results .note { font-size: 13px; color: var(--accent); }

.results mark { background: var(--accent-soft); color: var(--accent); border-radius: 3px; }

.grow { flex: 1; min-width: 0; }

.icon-btn.small { padding: 4px; }

.icon-btn.small svg { width: 16px; height: 16px; }

.follow-btn {
  position: fixed;
  left: 50%;
  bottom: calc(var(--controls-h, 100px) + 12px);
  z-index: 20;
  transform: translateX(-50%);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 14px;
  background: var(--surface);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 4px 16px rgba(0, 0, 0, .25);
}