.bc-tool-wrapper { --p-bg: #ffffff; --p-border: #e2e8f0; --p-primary: #4f46e5; --p-text: #0f172a; width: 100%; max-width: 1400px; 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); }
.bc-header-main { font-size: 1.6rem; font-weight: 800; color: var(--p-text); margin-bottom: 8px; text-align: center; }
.bc-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; }

/* 左右双栏布局 */
.bc-layout { display: grid; grid-template-columns: 400px 1fr; gap: 24px; align-items: stretch; }
@media(max-width: 1000px) { .bc-layout { grid-template-columns: 1fr; } }

/* 面板通用样式 */
.bc-panel { display: flex; flex-direction: column; background: #f8fafc; border: 1px solid var(--p-border); border-radius: 16px; overflow: hidden; }
.bc-config-panel { padding: 0; }
.bc-result-panel { background: #ffffff; padding: 20px; }
.bc-panel-title { font-size: 1.05rem; font-weight: 700; color: #334155; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--p-border); }

/* 配置区模块化 */
.bc-config-section { padding: 20px; border-bottom: 1px solid var(--p-border); }
.bc-section-title { font-size: 1rem; font-weight: 700; color: var(--p-text); margin-bottom: 16px; display: flex; align-items: center; justify-content: space-between; }
.bc-config-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* 表单元素 */
.bc-form-group { display: flex; flex-direction: column; }
.bc-label { font-size: 0.85rem; font-weight: 600; color: #475569; margin-bottom: 6px; }

.bc-input, .bc-select, .bc-textarea { width: 100%; padding: 10px; border-radius: 8px; border: 1px solid #cbd5e1; background: #ffffff; color: var(--p-text); font-size: 0.95rem; outline: none; transition: 0.2s; box-sizing: border-box; }
.bc-textarea { resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; line-height: 1.5; }
.bc-input:focus, .bc-select:focus, .bc-textarea:focus { border-color: var(--p-primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1); }
.bc-input:disabled { background: #f1f5f9; cursor: not-allowed; opacity: 0.7; }

/* 颜色选取器 */
.bc-color-picker-wrap { display: flex; align-items: center; gap: 8px; background: #ffffff; border: 1px solid #cbd5e1; border-radius: 8px; padding: 4px 10px; transition: 0.2s; }
.bc-color-picker-wrap.disabled { background: #f1f5f9; opacity: 0.5; pointer-events: none; }
.bc-color-input { -webkit-appearance: none; -moz-appearance: none; appearance: none; width: 28px; height: 28px; background: transparent; border: none; cursor: pointer; padding: 0; border-radius: 4px; overflow: hidden; }
.bc-color-input::-webkit-color-swatch-wrapper { padding: 0; }
.bc-color-input::-webkit-color-swatch { border: 1px solid #cbd5e1; border-radius: 4px; }
.bc-color-val { font-family: monospace; font-size: 0.85rem; color: #475569; }

/* 自定义文件上传区 */
.bc-file-upload { display: block; width: 100%; border: 2px dashed #cbd5e1; background: #ffffff; border-radius: 8px; padding: 16px; text-align: center; cursor: pointer; transition: 0.2s; }
.bc-file-upload:hover { border-color: var(--p-primary); background: #eef2ff; }
.bc-file-upload input[type="file"] { display: none; }
.bc-file-upload-text { font-size: 0.9rem; font-weight: 600; color: var(--p-primary); }

/* 按钮 */
.bc-panel-footer { padding: 20px; background: #f1f5f9; border-top: 1px solid var(--p-border); }
.bc-btn { width: 100%; border: none; padding: 14px; border-radius: 10px; font-weight: 700; font-size: 1rem; cursor: pointer; transition: 0.2s; display: flex; justify-content: center; align-items: center; gap: 8px; }
.bc-btn-primary { background: var(--p-primary); color: white; box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3); }
.bc-btn-primary:hover { background: #4338ca; transform: translateY(-1px); }

.bc-btn-sm { padding: 6px 12px; font-size: 0.85rem; border-radius: 6px; cursor: pointer; transition: 0.2s; font-weight: 600; }
.bc-btn-outline { background: transparent; border: 1px solid #cbd5e1; color: #64748b; }
.bc-btn-outline:hover { background: #f1f5f9; color: #0f172a; }
.bc-btn-download { background: #10b981; border: none; color: white; width: 100%; margin-top: 12px; }
.bc-btn-download:hover { background: #059669; }

/* 结果展示网格 */
.bc-result-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; align-content: start; min-height: 400px; max-height: 900px; overflow-y: auto; padding-right: 8px; }
.bc-empty-state { grid-column: 1 / -1; text-align: center; color: #94a3b8; font-size: 0.95rem; padding: 60px 0; }

.bc-card { background: #f8fafc; border: 1px solid var(--p-border); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; align-items: center; transition: 0.2s; }
.bc-card:hover { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05); border-color: #cbd5e1; transform: translateY(-2px); }
.bc-card-svg-wrap { width: 100%; display: flex; justify-content: center; overflow: hidden; background: #ffffff; border-radius: 8px; padding: 10px; border: 1px dashed #e2e8f0; }
.bc-card-svg-wrap.is-transparent { background: transparent; /* 如果是透明背景，使用网格图案以示区分 */ background-image: linear-gradient(45deg, #f1f5f9 25%, transparent 25%), linear-gradient(-45deg, #f1f5f9 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #f1f5f9 75%), linear-gradient(-45deg, transparent 75%, #f1f5f9 75%); background-size: 20px 20px; background-position: 0 0, 0 10px, 10px -10px, -10px 0px; }
.bc-card-svg-wrap svg { max-width: 100%; height: auto; }
.bc-card-error { color: #dc2626; font-size: 0.85rem; font-weight: 600; text-align: center; padding: 20px 0; }

/* ================= 黑夜模式强力覆盖 ================= */
[data-theme="dark"] .bc-tool-wrapper { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .bc-header-main, [data-theme="dark"] .bc-section-title, [data-theme="dark"] .bc-panel-title { color: #f8fafc; }
[data-theme="dark"] .bc-panel { background: #0f172a; border-color: #475569; }
[data-theme="dark"] .bc-result-panel { background: #1e293b; }
[data-theme="dark"] .bc-config-section { border-bottom-color: #334155; }
[data-theme="dark"] .bc-panel-footer { background: #0f172a; border-top-color: #334155; }
[data-theme="dark"] .bc-label, [data-theme="dark"] .bc-color-val { color: #cbd5e1; }
[data-theme="dark"] .bc-input, [data-theme="dark"] .bc-select, [data-theme="dark"] .bc-textarea { background: #020617; border-color: #475569; color: #f8fafc; }
[data-theme="dark"] .bc-color-picker-wrap { background: #020617; border-color: #475569; }
[data-theme="dark"] .bc-color-picker-wrap.disabled { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .bc-color-input::-webkit-color-swatch { border-color: #475569; }
[data-theme="dark"] .bc-file-upload { background: #0f172a; border-color: #475569; }
[data-theme="dark"] .bc-file-upload:hover { border-color: var(--p-primary); background: rgba(79,70,229,0.1); }
[data-theme="dark"] .bc-card { background: #0f172a; border-color: #475569; }
[data-theme="dark"] .bc-card-svg-wrap { background: #ffffff; border-color: #334155; }
[data-theme="dark"] .bc-card-svg-wrap.is-transparent { background: transparent; background-image: linear-gradient(45deg, #334155 25%, transparent 25%), linear-gradient(-45deg, #334155 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #334155 75%), linear-gradient(-45deg, transparent 75%, #334155 75%); }
[data-theme="dark"] .bc-btn-outline { border-color: #475569; color: #94a3b8; }
[data-theme="dark"] .bc-btn-outline:hover { background: #334155; color: #f8fafc; }