:root {
  --bg-color: #ffffff;
  --surface-color: #f9f9fb;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --border-color: #e5e5e5;
  --accent-color: #0066ff;
  --install-bg: #e6f0ff;
  --warning-bg: #fff3cd;
  --warning-text: #856404;
  --warning-border: #ffeeba;
  --approved-color: #f59e0b; /* 新增：Approved 虛底線顏色 */
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
    --border-color: #333333;
    --accent-color: #3388ff;
    --install-bg: #1a2b4c;
    --warning-bg: #332701;
    --warning-text: #ffdf7e;
    --warning-border: #4d3a02;
    --approved-color: #fbbf24; /* 新增：深色模式下的虛底線顏色 */
  }
}

body {
  margin: 0; padding: 2rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color); color: var(--text-primary);
  display: flex; flex-direction: column; height: 100vh; box-sizing: border-box;
}

header { margin-bottom: 1.5rem; display: flex; justify-content: space-between; align-items: flex-start; }
.header-text h1 { font-size: 1.5rem; font-weight: 600; margin: 0; letter-spacing: -0.02em; }
.subtitle { color: var(--text-secondary); font-size: 0.875rem; margin-top: 0.5rem; }

/* =========================================
   1. 折疊面板與合規說明 (Accordion) 
   ========================================= */
.info-accordion {
  margin-bottom: 1.5rem;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}
.info-accordion summary {
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  list-style: none;
  transition: background 0.2s ease, color 0.2s ease;
}
.info-accordion summary::-webkit-details-marker {
  display: none; /* 隱藏原生箭頭 */
}
.info-accordion summary:hover {
  background: var(--border-color);
  color: var(--text-primary);
}
.accordion-content {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-color);
}

/* --- 合規聲明標籤 --- */
.compliance-badges {
  display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.5rem;
}
.compliance-badges .badge {
  background-color: var(--surface-color); color: var(--text-secondary);
  font-size: 0.75rem; font-weight: 600; padding: 0.25rem 0.5rem;
  border-radius: 4px; border: 1px solid var(--border-color); cursor: help;
  transition: all 0.2s ease;
}
.compliance-badges .badge:hover {
  background-color: var(--border-color); color: var(--text-primary);
}

/* --- 操作指引區塊 --- */
.instruction-panel {
  background-color: var(--install-bg); border-left: 4px solid var(--accent-color);
  padding: 1rem; border-radius: 0 8px 8px 0;
}
.instruction-panel h3 {
  margin-top: 0; color: var(--accent-color); font-size: 1rem; margin-bottom: 0.5rem;
}
.instruction-panel ol {
  margin: 0; padding-left: 1.5rem; color: var(--text-primary); font-size: 0.9rem; line-height: 1.6;
}
.instruction-panel li { margin-bottom: 0.25rem; }


/* =========================================
   2. PWA 按鈕與警告橫幅 
   ========================================= */
#installBtn {
  display: none; 
  background: var(--install-bg); color: var(--accent-color);
  border: 1px solid var(--accent-color); padding: 0.5rem 1rem;
  border-radius: 6px; font-size: 0.875rem; font-weight: 600; cursor: pointer;
  transition: all 0.2s ease;
}
#installBtn:hover { background: var(--accent-color); color: white; }

#warningBanner {
  display: none;
  background-color: var(--warning-bg);
  color: var(--warning-text);
  border: 1px solid var(--warning-border);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  line-height: 1.5;
}


/* =========================================
   3. 工作區與控制列 
   ========================================= */
.controls { margin-bottom: 1.5rem; display: flex; gap: 1rem; align-items: center; }
select, button {
  padding: 0.5rem 1rem; font-size: 0.875rem; border-radius: 6px;
  border: 1px solid var(--border-color); background: var(--surface-color); color: inherit;
  cursor: pointer;
}
button.primary { background: var(--accent-color); color: white; border: none; font-weight: 500; }

.workspace { display: flex; gap: 1.5rem; flex: 1; min-height: 0; }
.panel { 
  flex: 1; display: flex; flex-direction: column; 
  background: var(--surface-color); border: 1px solid var(--border-color);
  border-radius: 8px; overflow: hidden;
}
.panel-header {
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--border-color);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.875rem; font-weight: 500;
}


/* =========================================
   4. 輸入區與富文本輸出區 (重點更新)
   ========================================= */
textarea {
  flex: 1; width: 100%; padding: 1rem; border: none; resize: none;
  background: transparent; color: inherit; font-family: inherit; font-size: 1rem;
  line-height: 1.6; outline: none; box-sizing: border-box;
}

/* 為了渲染 HTML 虛底線，右側改用 div 取代 textarea */
.rich-output {
  flex: 1; width: 100%; padding: 1rem; border: none;
  background: transparent; color: inherit; font-family: inherit; font-size: 1rem;
  line-height: 1.6; outline: none; box-sizing: border-box;
  overflow-y: auto; white-space: pre-wrap; word-wrap: break-word;
}

/* Approved 詞彙的專屬樣式 (虛底線 + 滑鼠游標) */
.approved-term {
  border-bottom: 2px dashed var(--approved-color);
  cursor: help;
  position: relative;
  display: inline-block;
}


/* =========================================
   5. 響應式設定 
   ========================================= */
@media (max-width: 768px) {
  .workspace { flex-direction: column; }
  body { padding: 1rem; }
  header { flex-direction: column; gap: 1rem; }
}