:root {
  --color-paper: #f4f1e8;
  --color-paper-deep: #ece7d9;
  --color-ink: #1c1b18;
  --color-ink-soft: #6b665b;
  --color-line: #d9d3c3;
  --color-accent: #d8442a;
  --color-accent-deep: #b0331d;
  --color-mark: #e0a92e;
  --font-display: Inter, Noto Sans TC, sans-serif;
  --font-body: Inter, Noto Sans TC, sans-serif;
  --font-mono: Inter, Noto Sans TC, sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

.tool-intro {
  max-width: 64ch;
  margin-block: 24px 40px;
  color: #6b665b;
}

.case-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

.editor-pane {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.editor-toolbar-label {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: #6b665b;
  font-variant-numeric: tabular-nums;
}

.editor-toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.text-area {
  width: 100%;
  min-height: 420px;
  padding: 24px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  line-height: 1.85;
  color: #1c1b18;
  background: #f4f1e8;
  border: 1.5px solid #1c1b18;
  border-radius: 2px;
  box-shadow: 6px 6px 0 rgba(28, 27, 24, 0.12);
  resize: vertical;
  transition: border-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.text-area::placeholder {
  color: #6b665b;
}
.text-area:focus {
  outline: none;
  border-color: #d8442a;
}

.copy-hint {
  min-height: 1.4em;
  margin: 0;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #d8442a;
}

.case-pane {
  position: sticky;
  top: 24px;
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: #ece7d9;
  border: 1px solid #d9d3c3;
  border-radius: 2px;
}
.case-pane .section-rule {
  margin-top: 0;
}

.case-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.case-btn {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  padding: 8px 16px;
  text-align: left;
  background: #f4f1e8;
  border: 1px solid #d9d3c3;
  border-radius: 2px;
  cursor: pointer;
  transition: border-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), background-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.case-btn:hover {
  border-color: #d8442a;
  transform: translateX(2px);
}
.case-btn:active {
  transform: translateX(0);
}
.case-btn:focus-visible {
  outline: 2px solid #d8442a;
  outline-offset: 2px;
}

.case-btn-name {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #1c1b18;
}

.case-btn-en {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: #6b665b;
}

.case-note {
  margin: 24px 0 0;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: #6b665b;
}

@media (max-width: 860px) {
  .case-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
  .case-pane {
    position: static;
  }
  .text-area {
    min-height: 320px;
  }
  .case-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}