.diff-tool-wrapper { --p-bg: #ffffff; --p-border: #e2e8f0; --p-primary: #8b5cf6; --p-text: #0f172a; width: 100%; max-width: 1200px; margin: 0 auto; background: var(--p-bg); border-radius: 24px; padding: 32px; border: 1px solid var(--p-border); box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05); transition: 0.3s; }
.diff-header { font-size: 1.5rem; font-weight: 600; color: var(--p-text); margin-bottom: 8px; display: flex; align-items: center; gap: 12px; }
.diff-badge { background: #ede9fe; color: #5b21b6; padding: 4px 12px; border-radius: 30px; font-size: 0.8rem; font-weight: 500; }
.diff-subtitle { color: #64748b; font-size: 0.95rem; padding-bottom: 16px; border-bottom: 1px solid var(--p-border); margin-bottom: 24px; }

.diff-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 24px; }
@media(max-width: 768px) { .diff-grid { grid-template-columns: 1fr; } }

.diff-panel-title { font-weight: 600; color: var(--p-text); margin-bottom: 12px; display: flex; justify-content: space-between; align-items: center; }
.diff-textarea { width: 100%; height: 300px; padding: 16px; background: #f8fafc; border: 2px solid var(--p-border); color: var(--p-text); border-radius: 12px; outline: none; resize: vertical; font-family: monospace; font-size: 0.95rem; line-height: 1.6; transition: 0.2s; white-space: pre; overflow-x: auto; }
.diff-textarea:focus { border-color: var(--p-primary); box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1); background: #ffffff; }

.diff-actions { display: flex; justify-content: center; gap: 12px; margin-bottom: 24px; }
.diff-btn { padding: 12px 32px; border-radius: 8px; font-weight: 600; font-size: 1.05rem; cursor: pointer; border: none; transition: 0.2s; display: flex; align-items: center; gap: 8px; }
.diff-btn-primary { background: var(--p-primary); color: white; box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2); }
.diff-btn-primary:hover { filter: brightness(1.1); transform: translateY(-1px); }

.diff-result-box { width: 100%; min-height: 200px; padding: 20px; background: #ffffff; border: 2px solid var(--p-border); border-radius: 12px; font-family: monospace; font-size: 0.95rem; line-height: 1.6; color: var(--p-text); white-space: pre-wrap; word-wrap: break-word; overflow-x: auto; display: none; }
.diff-result-box.active { display: block; }

/* 差异高亮样式 */
.diff-result-box ins { background-color: #dcfce7; color: #166534; text-decoration: none; font-weight: 600; padding: 2px 0; }
.diff-result-box del { background-color: #fee2e2; color: #b91c1c; text-decoration: line-through; padding: 2px 0; opacity: 0.8; }

/* 黑夜模式强力覆盖 */
[data-theme="dark"] .diff-tool-wrapper { background: #1e293b !important; border-color: #334155 !important; }
[data-theme="dark"] .diff-textarea { background: #0f172a !important; border-color: #475569 !important; color: #f8fafc; }
[data-theme="dark"] .diff-textarea:focus { background: #1e293b !important; }
[data-theme="dark"] .diff-result-box { background: #0f172a !important; border-color: #475569 !important; color: #cbd5e1; }
[data-theme="dark"] .diff-result-box ins { background-color: rgba(22, 101, 52, 0.6); color: #86efac; }
[data-theme="dark"] .diff-result-box del { background-color: rgba(153, 27, 27, 0.5); color: #fca5a5; }