:root {
  --ink: #111;
  --muted: #666;
  --paper: #fff;
  --line: #c9c9c9;
  --soft: #f5f5f5;
  --panel: #fafafa;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", Arial, sans-serif;
  color: var(--ink);
  background: #eee;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  min-height: 36px;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  border-radius: 6px;
  padding: 6px 12px;
}

button:hover {
  background: var(--soft);
}

.app-shell {
  min-height: 100vh;
  padding: 18px;
}

.workspace {
  max-width: 1480px;
  margin: 0 auto;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 14px;
}

.topbar h1 {
  margin: 0 0 4px;
  font-size: 28px;
}

.topbar p {
  margin: 0;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.panels {
  display: grid;
  grid-template-columns: minmax(360px, 470px) minmax(420px, 1fr);
  gap: 16px;
  align-items: start;
}

.editor-panel,
.preview-panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.editor-panel {
  padding: 14px;
}

.preview-panel {
  min-height: calc(100vh - 100px);
  overflow: hidden;
}

.panel-block + .panel-block {
  border-top: 1px solid var(--line);
  margin-top: 14px;
  padding-top: 14px;
}

.block-heading,
.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.block-heading h2 {
  margin: 0;
  font-size: 18px;
}

.preview-toolbar {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.preview-toolbar span {
  color: var(--muted);
  font-size: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 150px;
  gap: 10px;
  margin-top: 10px;
}

label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 13px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--paper);
  padding: 8px;
}

textarea {
  min-height: 72px;
  resize: vertical;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  color: var(--ink);
}

.check-row input {
  width: auto;
}

.character-list,
.message-list {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.row-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 10px;
}

.row-grid {
  display: grid;
  grid-template-columns: 1fr 100px 110px 72px 40px;
  gap: 8px;
  align-items: end;
}

.message-grid {
  display: grid;
  grid-template-columns: 120px 72px 1fr 40px;
  gap: 8px;
  align-items: start;
}

.remove-btn {
  width: 40px;
  padding: 0;
  font-size: 20px;
  line-height: 1;
}

.preview-wrap {
  padding: 18px;
  overflow: auto;
  background:
    linear-gradient(45deg, #f7f7f7 25%, transparent 25%),
    linear-gradient(-45deg, #f7f7f7 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #f7f7f7 75%),
    linear-gradient(-45deg, transparent 75%, #f7f7f7 75%);
  background-position:
    0 0,
    0 10px,
    10px -10px,
    -10px 0;
  background-size: 20px 20px;
}

#chatSvg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.14);
}

@media (max-width: 980px) {
  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .actions {
    justify-content: flex-start;
  }

  .panels {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 10px;
  }

  .form-grid,
  .row-grid,
  .message-grid {
    grid-template-columns: 1fr;
  }

  .remove-btn {
    width: 100%;
  }
}

@media print {
  body {
    background: #fff;
  }

  .topbar,
  .editor-panel,
  .preview-toolbar {
    display: none;
  }

  .app-shell,
  .preview-wrap {
    padding: 0;
  }

  .panels {
    display: block;
  }

  .preview-panel {
    border: 0;
  }

  #chatSvg {
    box-shadow: none;
    width: 100%;
  }
}