.brc-tool-wrapper { --p-bg: #ffffff; --p-border: #e2e8f0; --p-primary: #3b82f6; --p-text: #0f172a; width: 100%; max-width: 1300px; margin: 0 auto; background: var(--p-bg); border-radius: 20px; padding: 24px; border: 1px solid var(--p-border); box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05); box-sizing: border-box; }
.brc-header-main { font-size: 1.6rem; font-weight: 800; color: var(--p-text); margin-bottom: 8px; text-align: center; }
.brc-subtitle { color: #64748b; font-size: 0.95rem; padding-bottom: 20px; border-bottom: 1px solid var(--p-border); margin-bottom: 24px; text-align: center; max-width: 800px; margin-left: auto; margin-right: auto; line-height: 1.6; }

.brc-layout { display: flex; flex-direction: column; gap: 24px; }
.brc-workspace { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media(max-width: 900px) { .brc-workspace { grid-template-columns: 1fr; } }

/* 面板通用 */
.brc-panel { display: flex; flex-direction: column; background: #f8fafc; border: 1px solid var(--p-border); border-radius: 16px; overflow: hidden; box-sizing: border-box; }
.brc-config-panel { padding: 24px; }
.brc-panel-title { font-size: 1.05rem; font-weight: 700; color: #334155; padding: 16px 20px; border-bottom: 1px solid var(--p-border); background: #ffffff; margin: 0; }
.brc-panel-body { flex: 1; display: flex; flex-direction: column; }

/* 顶栏控制组 */
.brc-controls-row { display: flex; flex-wrap: wrap; gap: 24px; }
.brc-form-group { display: flex; flex-direction: column; min-width: 200px; }
.brc-label { font-size: 0.9rem; font-weight: 600; color: #475569; margin-bottom: 12px; }
.brc-help-text { font-size: 0.75rem; color: #94a3b8; margin-top: 8px; }
.brc-val-badge { background: #eff6ff; border: 1px solid #bfdbfe; padding: 2px 8px; border-radius: 12px; font-size: 0.75rem; font-family: monospace; color: var(--p-primary); font-weight: bold; }

/* 滑块 Range */
.brc-range { -webkit-appearance: none; width: 100%; height: 6px; background: #e2e8f0; border-radius: 3px; outline: none; margin: 4px 0; }
.brc-range::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 20px; height: 20px; border-radius: 50%; background: var(--p-primary); cursor: pointer; transition: 0.2s; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
.brc-range::-webkit-slider-thumb:hover { transform: scale(1.15); }

/* 输入区与渲染区 */
.brc-textarea { width: 100%; min-height: 400px; height: 100%; padding: 20px; font-size: 1.05rem; line-height: 1.6; color: var(--p-text); background: #ffffff; border: none; outline: none; resize: vertical; box-sizing: border-box; font-family: inherit; }
.brc-textarea:focus { box-shadow: inset 0 0 0 2px rgba(59, 130, 246, 0.2); }

.brc-render-area { width: 100%; min-height: 400px; height: 100%; padding: 20px; font-size: 18px; line-height: 1.6; color: var(--p-text); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; overflow-y: auto; box-sizing: border-box; word-wrap: break-word; white-space: pre-wrap; }
/* Bionic 加粗核心样式 */
.brc-render-area b { font-weight: 800; }
.brc-render-area span.brc-saccade { opacity: 0.8; font-weight: 400; }

/* 动作按钮 */
.brc-actions { display: flex; gap: 12px; }
.brc-action-btn { padding: 6px 14px; font-size: 0.85rem; font-weight: 600; color: #475569; background: #f1f5f9; border: 1px solid #cbd5e1; border-radius: 6px; cursor: pointer; transition: 0.2s; display: flex; align-items: center; gap: 6px; }
.brc-action-btn:hover { background: #e2e8f0; color: #0f172a; }
.brc-action-primary { background: #eff6ff; color: var(--p-primary); border-color: #bfdbfe; }
.brc-action-primary:hover { background: var(--p-primary); color: #ffffff; border-color: var(--p-primary); }
.brc-action-danger { color: #ef4444; border-color: #fca5a5; background: #fef2f2; }
.brc-action-danger:hover { background: #fee2e2; color: #dc2626; border-color: #f87171; }


/* ================= 黑夜模式适配 ================= */
[data-theme="dark"] .brc-tool-wrapper { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .brc-header-main, [data-theme="dark"] .brc-panel-title { color: #f8fafc; }
[data-theme="dark"] .brc-panel { background: #0f172a; border-color: #475569; }
[data-theme="dark"] .brc-panel-title { background: #1e293b; border-bottom-color: #475569; }
[data-theme="dark"] .brc-label { color: #cbd5e1; }
[data-theme="dark"] .brc-val-badge { background: #1e293b; border-color: #475569; }
[data-theme="dark"] .brc-range { background: #334155; }
[data-theme="dark"] .brc-textarea { background: #020617; color: #f8fafc; }
[data-theme="dark"] .brc-render-area { background: #020617; color: #f8fafc; }
[data-theme="dark"] .brc-render-area span.brc-saccade { opacity: 0.8; }
[data-theme="dark"] .brc-action-btn { background: #334155; border-color: #475569; color: #f8fafc; }
[data-theme="dark"] .brc-action-btn:hover { background: #475569; }
[data-theme="dark"] .brc-action-primary { background: rgba(59, 130, 246, 0.2); color: #60a5fa; border-color: #3b82f6; }
[data-theme="dark"] .brc-action-primary:hover { background: #3b82f6; color: #ffffff; }
[data-theme="dark"] .brc-action-danger { background: rgba(239, 68, 68, 0.1); border-color: #991b1b; color: #f87171; }
[data-theme="dark"] .brc-action-danger:hover { background: rgba(239, 68, 68, 0.2); }