:root {
  --bg: #f0f2f5;
  --panel: #ffffff;
  --border: #d9dde3;
  --text: #1f2933;
  --muted: #7b8794;
  --accent: #2f7d6d;
  --accent-dark: #25655a;
  --danger: #c0392b;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: 'Noto Sans TC', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

.view { height: 100vh; display: flex; flex-direction: column; }
.spacer { flex: 1; }
[hidden] { display: none !important; }

/* ===== buttons / inputs ===== */
.btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
}
.btn:hover { background: #f3f5f7; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-dark); }
.btn.danger { color: var(--danger); }
.btn.icon { padding: 6px 10px; }
.btn.mini { padding: 1px 8px; font-size: 12px; }
.btn.wide { width: 100%; }
.btn.tool { font-size: 13px; }
.btn.tool.active-tool { background: var(--accent); color: #fff; border-color: var(--accent); }
.error { color: var(--danger); min-height: 1.2em; font-size: 13px; }

input[type=text], input[type=password], input[type=number], select, textarea {
  font-family: inherit;
  font-size: 14px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid rgba(47,125,109,.35); }
label { display: block; margin: 8px 0 4px; font-size: 13px; color: var(--muted); }
label > input, label > select { margin-top: 4px; }

dialog {
  border: none; border-radius: 12px; padding: 22px 26px;
  box-shadow: 0 12px 40px rgba(0,0,0,.25); min-width: 360px;
}
dialog::backdrop { background: rgba(20,30,40,.45); }
dialog h2 { margin: 0 0 10px; font-size: 18px; }
dialog menu { display: flex; gap: 10px; justify-content: flex-end; padding: 0; margin: 18px 0 0; }
.row { display: flex; gap: 12px; }
.row > label { flex: 1; }

/* ===== login ===== */
.login-view { align-items: center; justify-content: center; background: linear-gradient(135deg, #2f7d6d 0%, #1d4f46 100%); }
.login-card {
  background: #fff; padding: 40px 44px; border-radius: 16px;
  box-shadow: 0 16px 60px rgba(0,0,0,.35); width: 360px; text-align: center;
}
.login-card h1 { margin: 0; font-size: 24px; font-weight: 900; color: var(--accent-dark); }
.login-sub { color: var(--muted); margin: 6px 0 22px; }
.login-card input { margin-bottom: 12px; }
.login-card a { color: var(--accent); }

/* ===== shelf ===== */
.shelf-header {
  display: flex; align-items: center; gap: 14px;
  background: #fff; border-bottom: 1px solid var(--border); padding: 12px 24px;
}
.shelf-header h1 { font-size: 18px; margin: 0; }
.shelf-main { padding: 22px 28px; overflow: auto; }
.shelf-actions { display: flex; gap: 10px; margin-bottom: 18px; }
.book-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }
.book-card {
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 16px; cursor: pointer; transition: box-shadow .15s;
  display: flex; flex-direction: column; gap: 6px;
}
.book-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.10); }
.book-card .bk-title { font-weight: 700; font-size: 15px; }
.book-card .bk-meta { color: var(--muted); font-size: 12px; }
.book-card .bk-actions { display: flex; gap: 6px; margin-top: 8px; }
.empty-hint { color: var(--muted); padding: 40px; text-align: center; grid-column: 1/-1; }

/* ===== editor chrome ===== */
.ed-topbar {
  display: flex; align-items: center; gap: 8px;
  background: #fff; border-bottom: 1px solid var(--border); padding: 8px 12px;
  flex: 0 0 auto;
}
.ed-title { width: 260px; font-weight: 700; }
.save-status { color: var(--muted); font-size: 12px; min-width: 70px; }
.mode-switch { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; flex-shrink: 0; }
.mode-switch button {
  border: none; background: #fff; padding: 7px 16px; cursor: pointer; font-family: inherit; font-size: 13px;
  border-right: 1px solid var(--border);
  white-space: nowrap;
}
.mode-switch button:last-child { border-right: none; }
.mode-switch button.active { background: var(--accent); color: #fff; }

.ed-body { flex: 1; display: flex; min-height: 0; position: relative; }

.ed-pages {
  width: 150px; background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
}
.panel-title {
  padding: 8px 10px; font-size: 13px; color: var(--muted);
  display: flex; align-items: center; gap: 6px; justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.page-thumbs { flex: 1; overflow-y: auto; padding: 10px; display: flex; flex-direction: column; gap: 10px; }
.page-thumb { position: relative; cursor: pointer; }
.page-thumb .pt-canvas {
  width: 100%; background: #fff; border: 2px solid var(--border); border-radius: 4px;
  overflow: hidden; position: relative;
}
.page-thumb.active .pt-canvas { border-color: var(--accent); }
.page-thumb .pt-label { font-size: 11px; color: var(--muted); text-align: center; margin-top: 2px; }
.page-thumb .pt-del {
  position: absolute; top: 2px; right: 2px; display: none;
  background: rgba(255,255,255,.9); border: 1px solid var(--border); border-radius: 4px;
  font-size: 11px; cursor: pointer; padding: 0 5px;
}
.page-thumb:hover .pt-del { display: block; }

.ed-center { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.ed-toolbar {
  display: flex; align-items: center; gap: 6px;
  background: var(--panel); border-bottom: 1px solid var(--border); padding: 6px 12px;
}
.ed-toolbar .sep { width: 1px; height: 22px; background: var(--border); margin: 0 8px; }
#zoom-label { font-size: 12px; color: var(--muted); width: 44px; text-align: center; }

.ed-canvas-wrap { flex: 1; overflow: auto; background: #e3e7ec; position: relative; }
.ed-canvas-scale { transform-origin: 0 0; padding: 40px; width: max-content; }
.ed-page {
  position: relative; background: #fff;
  box-shadow: 0 6px 24px rgba(0,0,0,.18);
  overflow: hidden;
}

/* blocks on canvas */
.blk { position: absolute; cursor: move; }
.blk.text-blk { white-space: pre-wrap; word-break: break-word; }
.blk img { width: 100%; height: 100%; display: block; pointer-events: none; }
.blk.selected { outline: 1.5px solid #1c7ed6; outline-offset: 0; }
.blk.editing { cursor: text; outline: 1.5px dashed #1c7ed6; }
.blk .img-placeholder {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  background: #eef1f4; color: var(--muted); font-size: 12px; border: 1px dashed var(--border);
}

/* selection handles (in overlay, screen-space) */
.sel-overlay { position: absolute; pointer-events: none; z-index: 50; }
.handle {
  position: absolute; width: 9px; height: 9px; background: #fff;
  border: 1.5px solid #1c7ed6; border-radius: 2px; pointer-events: all;
}
.handle.rot { border-radius: 50%; cursor: grab; }

/* ===== right panel ===== */
.ed-props {
  width: 250px; background: var(--panel); border-left: 1px solid var(--border);
  display: flex; flex-direction: column;
}
.panel-tabs { display: flex; border-bottom: 1px solid var(--border); }
.panel-tabs button {
  flex: 1; border: none; background: none; padding: 9px 0; cursor: pointer;
  font-family: inherit; font-size: 13px; color: var(--muted);
  border-bottom: 2px solid transparent;
}
.panel-tabs button.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 700; }
.pane { flex: 1; overflow-y: auto; padding: 12px; }
.pane .group { margin-bottom: 14px; }
.pane .group-title { font-size: 12px; color: var(--muted); margin-bottom: 6px; font-weight: 700; }
.pane .frow { display: flex; gap: 8px; margin-bottom: 6px; align-items: center; }
.pane .frow label { margin: 0; flex: 0 0 auto; width: 56px; font-size: 12px; }
.pane .frow input[type=number] { width: 64px; padding: 4px 6px; }
.pane .frow input[type=color] { width: 34px; height: 28px; padding: 1px; border: 1px solid var(--border); border-radius: 4px; background: #fff; }
.pane .frow select { padding: 4px 6px; }
.pane .frow .seg { display: flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.pane .frow .seg button { border: none; background: #fff; padding: 4px 9px; cursor: pointer; font-size: 13px; }
.pane .frow .seg button.on { background: var(--accent); color: #fff; }
.pane textarea { min-height: 90px; resize: vertical; }
.hint { font-size: 12px; color: var(--muted); line-height: 1.5; }

/* layers */
.layer-item {
  display: flex; align-items: center; gap: 8px; padding: 7px 8px;
  border: 1px solid var(--border); border-radius: 6px; margin-bottom: 6px;
  background: #fff; cursor: pointer; font-size: 13px;
}
.layer-item.selected { border-color: var(--accent); background: #eef7f4; }
.layer-item .ly-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.layer-item .ly-flow { font-size: 11px; color: var(--muted); }
.layer-item button { border: none; background: none; cursor: pointer; color: var(--muted); padding: 0 3px; }

/* ===== preview overlay ===== */
.preview-overlay {
  position: absolute; inset: 0; top: 0; background: #30353b;
  display: flex; flex-direction: column; z-index: 100;
}
.editor-view { position: relative; }
.preview-toolbar {
  display: flex; align-items: center; gap: 12px; padding: 10px 18px;
  background: #23272c; color: #cfd5db; font-size: 13px;
}
.preview-toolbar .btn { background: #3a4046; border-color: #4a5057; color: #e6eaee; }
.preview-toolbar input[type=range] { width: 160px; }
.preview-stage {
  flex: 1; overflow: auto; display: flex; align-items: flex-start; justify-content: center;
  padding: 30px;
}

/* print preview */
.pv-print { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.pv-spread { display: flex; gap: 0; box-shadow: 0 10px 40px rgba(0,0,0,.5); }
.pv-page { background: #fff; position: relative; overflow: hidden; flex: 0 0 auto; }
.pv-page + .pv-page { border-left: 1px solid #ddd; }
.pv-pageno { color: #9aa3ab; font-size: 12px; }

/* device preview */
.device-frame {
  background: #0a0a0a; border-radius: 44px; padding: 14px;
  box-shadow: 0 14px 50px rgba(0,0,0,.55);
  flex: 0 0 auto;
}
.device-frame.tablet { border-radius: 30px; padding: 18px; }
.device-screen {
  background: #fff; overflow-y: auto; border-radius: 30px;
  -webkit-overflow-scrolling: touch;
}
.device-frame.tablet .device-screen { border-radius: 14px; }

/* reflow content inside device */
.reflow { padding: 0 0 60px; font-family: 'Noto Sans TC', sans-serif; }
.reflow .rf-pagebreak { text-align: center; color: #b6bcc2; font-size: 11px; margin: 26px 0 10px; letter-spacing: 2px; }
.reflow .rf-title { font-size: 1.5em; font-weight: 900; line-height: 1.35; margin: 18px 16px 8px; }
.reflow .rf-subtitle { font-size: 1.15em; font-weight: 700; line-height: 1.4; margin: 14px 16px 6px; color: #2f7d6d; }
.reflow .rf-body { font-size: 1em; line-height: 1.9; margin: 10px 16px; white-space: pre-wrap; word-break: break-word; }
.reflow .rf-caption { font-size: .82em; color: #7b8794; margin: 4px 16px 12px; text-align: center; }
.reflow .rf-quote {
  margin: 14px 16px; padding: 12px 16px; background: #f1f6f4;
  border-left: 4px solid #2f7d6d; border-radius: 0 8px 8px 0; line-height: 1.8; white-space: pre-wrap;
}
.reflow .rf-image { width: 100%; display: block; margin: 12px 0; }
.reflow .rf-divider { border: none; border-top: 1px solid #e3e7ec; margin: 20px 24px; }

/* template picker */
.template-list { display: grid; grid-template-columns: repeat(3, 150px); gap: 14px; }
.tpl-card { cursor: pointer; text-align: center; }
.tpl-card .tpl-box {
  border: 2px solid var(--border); border-radius: 6px; background: #fff;
  position: relative; overflow: hidden; margin-bottom: 4px;
}
.tpl-card:hover .tpl-box { border-color: var(--accent); }
.tpl-card .tpl-name { font-size: 12px; color: var(--muted); }