* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --border: #d5d8dc;
  --bg: #f4f5f7;
  --panel: #ffffff;
  --accent: #2a6df4;
  --accent-soft: #eef2ff;
  --text: #1d2733;
  --muted: #6b7684;
  --danger: #d64545;
}

html, body { height: 100%; }
body {
  display: flex; flex-direction: column; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ---- toolbar ---- */
.toolbar {
  display: flex; align-items: center; gap: 10px; padding: 8px 12px; flex-wrap: wrap;
  background: var(--panel); border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.toolbar .group { display: flex; align-items: center; gap: 4px; }
.toolbar .hint { margin-left: auto; font-size: 12px; color: var(--muted); }

button, label.btn {
  font: inherit; padding: 6px 12px; border: 1px solid var(--border); border-radius: 6px;
  background: #fff; color: var(--text); cursor: pointer; transition: background .12s ease;
}
button:hover, label.btn:hover { background: var(--accent-soft); }
button:active { transform: translateY(1px); }
button:disabled { opacity: .4; cursor: not-allowed; }
button.small { padding: 2px 8px; font-size: 12px; }
button.danger { color: var(--danger); border-color: var(--danger); }
#restore-btn { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
#page-indicator { font-size: 13px; color: var(--muted); min-width: 84px; text-align: center; }
#zoom-indicator { font-size: 12px; color: var(--muted); min-width: 40px; text-align: center; }

/* ---- workspace ---- */
#workspace { flex: 1; display: flex; min-height: 0; }

#page-pane { flex: 1; position: relative; display: flex; min-width: 0; background: #5c6570; }
#page-scroll {
  flex: 1; overflow: auto; padding: 16px; text-align: center;
}
#page-canvas {
  display: block; margin: 0 auto; background: #fff; box-shadow: 0 2px 14px rgba(0,0,0,.4);
  touch-action: none;
}
#empty-tip {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: #cfd6de; font-size: 20px; pointer-events: none;
}

/* ---- side pane ---- */
#side-pane {
  width: 380px; flex-shrink: 0; background: var(--panel); border-left: 1px solid var(--border);
  display: flex; flex-direction: column; min-width: 280px; min-height: 0;
}
.side-block { padding: 10px 12px; display: flex; flex-direction: column; min-height: 0; }
.side-block + .side-block { border-top: 1px solid var(--border); }
.side-block h3 { font-size: 13px; margin-bottom: 8px; color: var(--muted); font-weight: 600; }

#pick-block { flex-shrink: 0; max-height: 45%; }
.pick-list { overflow-y: auto; display: flex; flex-direction: column; gap: 6px; }
.pick-item {
  display: flex; align-items: center; gap: 8px; border: 1px solid var(--border); border-radius: 6px;
  padding: 5px 8px; background: #fafbfc;
}
.pick-idx {
  width: 22px; height: 22px; border-radius: 50%; background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 12px; flex-shrink: 0;
}
.pick-meta { flex: 1; font-size: 12px; color: var(--muted); }

#preview-block { flex: 1; min-height: 120px; }
#preview-viewport { flex: 1; overflow: auto; background: #e9ebee; border: 1px solid var(--border); border-radius: 6px; }
#preview-pages { display: flex; flex-direction: column; gap: 8px; padding: 8px; align-items: center; }
#preview-pages canvas { width: 100%; box-shadow: 0 1px 5px rgba(0,0,0,.25); background: #fff; }
#preview-pages:empty::after {
  content: "选行后此处显示分谱预览"; color: var(--muted); font-size: 13px; padding: 20px;
}

/* ---- settings dialog ---- */
dialog { border: 1px solid var(--border); border-radius: 10px; padding: 0; box-shadow: 0 12px 40px rgba(0,0,0,.3); }
dialog::backdrop { background: rgba(0,0,0,.4); }
.settings-form { padding: 20px; display: flex; flex-direction: column; gap: 14px; min-width: 280px; }
.settings-form h3 { margin-bottom: 4px; }
.settings-form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.settings-form input, .settings-form select {
  font: inherit; padding: 6px 8px; border: 1px solid var(--border); border-radius: 6px; color: var(--text);
}
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }

.hidden { display: none !important; }