/* =====================================================================
 * Excel 批量替换影响预演 · 独立皮肤（DIFF WORKBENCH）
 * 靛青 + 琥珀的「前后对照」视觉；左侧规则工作台、右侧改动清单。
 * 深浅主题由导航 #themeToggle 控制，本页不新增主题控件。
 * ===================================================================== */

.br-page {
    --fg-bg: #f5f6fc;
    --fg-bg-grad: radial-gradient(1000px 480px at 6% -10%, rgba(79, 70, 229, .13), transparent 62%),
                  radial-gradient(820px 420px at 94% 0%, rgba(217, 119, 6, .09), transparent 60%);
    --fg-surface: #ffffff;
    --fg-surface-2: #f8f9ff;
    --fg-surface-3: #eef0fb;
    --fg-ink: #1b1c36;
    --fg-ink-2: #4b4f70;
    --fg-ink-3: #7d819f;
    --fg-line: #e1e3f2;
    --fg-line-2: #c9cce8;
    --fg-brand: #4f46e5;
    --fg-brand-2: #4338ca;
    --fg-brand-soft: #ecebff;
    --fg-brand-ink: #3730a3;
    --fg-amber: #b45309;
    --fg-amber-soft: #fff3e2;
    --fg-red: #c2314a;
    --fg-red-soft: #fdecef;
    --fg-green: #0f8a63;
    --fg-green-soft: #e6f6ef;
    --fg-shadow: 0 1px 2px rgba(27, 28, 54, .05), 0 12px 32px rgba(27, 28, 54, .07);
    --br-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 15px;
    line-height: 1.8;
}
:root[data-theme="dark"] .br-page {
    --fg-bg: #0c0d18;
    --fg-bg-grad: radial-gradient(1000px 480px at 6% -10%, rgba(129, 140, 248, .13), transparent 62%),
                  radial-gradient(820px 420px at 94% 0%, rgba(251, 146, 60, .08), transparent 60%);
    --fg-surface: #14162a;
    --fg-surface-2: #191c34;
    --fg-surface-3: #202442;
    --fg-ink: #e9eafd;
    --fg-ink-2: #b7bbdc;
    --fg-ink-3: #8b90b4;
    --fg-line: #2a2e50;
    --fg-line-2: #3a3f68;
    --fg-brand: #a5b4fc;
    --fg-brand-2: #c7d2fe;
    --fg-brand-soft: rgba(165, 180, 252, .13);
    --fg-brand-ink: #c7d2fe;
    --fg-amber: #fbbf6a;
    --fg-amber-soft: rgba(251, 191, 106, .12);
    --fg-red: #ff8fa3;
    --fg-red-soft: rgba(255, 143, 163, .12);
    --fg-green: #5fd0a8;
    --fg-green-soft: rgba(95, 208, 168, .12);
    --fg-shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 12px 32px rgba(0, 0, 0, .32);
    color-scheme: dark;
}
.br-wrap { width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 0 0 60px; }
.br-page code, .br-page .br-mono { font-family: var(--br-mono); font-size: .92em; }
.br-page strong, .br-page b { color: var(--fg-ink); }

/* ---------- 首屏 ---------- */
.br-hero { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 30px; align-items: center; padding: 34px 0 22px; }
.br-kicker { display: inline-flex; align-items: center; gap: 8px; padding: 5px 12px; border-radius: 999px;
    font-size: 12px; font-weight: 800; letter-spacing: .06em; color: var(--fg-brand-ink);
    background: var(--fg-brand-soft); border: 1px solid var(--fg-line-2); }
.br-hero h1 { margin: 14px 0 12px; font-size: clamp(28px, 3.6vw, 40px); line-height: 1.26; font-weight: 800; letter-spacing: -.02em; }
.br-hero h1 em { font-style: normal; color: var(--fg-brand); }
.br-lede { margin: 0; max-width: 660px; font-size: 15px; line-height: 1.9; color: var(--fg-ink-2); }
.br-lede strong { color: var(--fg-brand-ink); font-weight: 700; }
.br-hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.br-hero-tags span { font-size: 12px; padding: 5px 11px; border-radius: 8px; color: var(--fg-ink-2);
    background: var(--fg-surface); border: 1px solid var(--fg-line); }

/* 右侧「改动对照卡」装饰 */
.br-hero-art { position: relative; padding: 10px 0; }
.br-diff-card { border: 1px solid var(--fg-line-2); border-radius: 16px; background: var(--fg-surface);
    box-shadow: var(--fg-shadow); overflow: hidden; transform: rotate(-1.2deg); }
.br-diff-head { display: flex; align-items: center; gap: 6px; padding: 11px 14px; background: var(--fg-surface-3); border-bottom: 1px solid var(--fg-line); font-size: 12px; color: var(--fg-ink-3); font-family: var(--br-mono); }
.br-diff-head i { width: 8px; height: 8px; border-radius: 50%; background: var(--fg-line-2); }
.br-diff-head i:first-child { background: var(--fg-red); }
.br-diff-head i:nth-child(2) { background: var(--fg-amber); }
.br-diff-head i:nth-child(3) { background: var(--fg-green); }
.br-diff-head span { margin-left: 8px; }
.br-diff-row { display: grid; grid-template-columns: 46px minmax(0, 1fr) 22px minmax(0, 1fr); gap: 8px; align-items: center;
    padding: 11px 14px; border-bottom: 1px dashed var(--fg-line); font-size: 12.5px; font-family: var(--br-mono); }
.br-diff-row b { font-size: 11px; color: var(--fg-ink-3); }
.br-diff-row .old { color: var(--fg-red); text-decoration: line-through; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.br-diff-row .new { color: var(--fg-green); font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.br-diff-row .arrow { color: var(--fg-ink-3); text-align: center; }
.br-diff-row.warn { background: var(--fg-amber-soft); }
.br-diff-foot { display: flex; align-items: center; gap: 8px; padding: 10px 14px; font-size: 12px; color: var(--fg-amber); font-weight: 700; }
.br-diff-foot .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--fg-amber); }
.br-float { position: absolute; padding: 6px 12px; border-radius: 999px; font-size: 12px; font-weight: 700;
    background: var(--fg-surface); border: 1px solid var(--fg-line-2); box-shadow: var(--fg-shadow); color: var(--fg-brand-ink); }
.br-float.f1 { top: -6px; right: -8px; transform: rotate(4deg); }
.br-float.f2 { bottom: -18px; left: -22px; transform: rotate(-3deg); color: var(--fg-green); }

/* ---------- 流程条 / 安全边界 ---------- */
.br-flow { display: flex; align-items: center; gap: 10px; padding: 14px 18px; border: 1px solid var(--fg-line);
    border-radius: 12px; background: var(--fg-surface); }
.br-flow-step { display: flex; align-items: center; gap: 9px; font-size: 13px; font-weight: 700; color: var(--fg-ink-2); white-space: nowrap; }
.br-flow-step b { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; border-radius: 50%;
    background: var(--fg-brand); color: #fff; font-size: 12px; }
.br-flow-line { flex: 1 1 20px; height: 1px; background: var(--fg-line-2); }
.br-safety { margin-top: 12px; padding: 12px 16px; border-radius: 11px; border: 1px solid var(--fg-line);
    background: var(--fg-amber-soft); color: var(--fg-ink-2); font-size: 12.8px; line-height: 1.85; }
.br-safety b { color: var(--fg-amber); }

/* ---------- 主工作区 ---------- */
.br-grid { display: grid; grid-template-columns: minmax(0, 440px) minmax(0, 1fr); gap: 16px; margin-top: 18px; align-items: start; }
.br-card { min-width: 0; background: var(--fg-surface); border: 1px solid var(--fg-line); border-top: 3px solid var(--fg-brand);
    border-radius: 14px; box-shadow: var(--fg-shadow); padding: 20px; }
.br-out { position: sticky; top: 16px; }
.br-card-h { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap;
    margin: 0 0 16px; font-size: 16px; font-weight: 800; line-height: 1.5; }
.br-card-h small { font-size: 12px; font-weight: 500; color: var(--fg-ink-3); }

/* 上传 */
.br-drop { position: relative; display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 22px 16px;
    border: 1.5px dashed var(--fg-line-2); border-radius: 12px; background: var(--fg-surface-2);
    text-align: center; cursor: pointer; transition: .15s; }
.br-drop:hover, .br-drop.is-over { border-color: var(--fg-brand); background: var(--fg-brand-soft); }
.br-drop.has-file { border-style: solid; border-color: var(--fg-green); background: var(--fg-green-soft); }
.br-drop-ic { display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: 11px;
    background: var(--fg-surface); border: 1px solid var(--fg-line-2); font-family: var(--br-mono); font-size: 13px; font-weight: 800; color: var(--fg-brand); }
.br-drop-t { font-size: 14px; font-weight: 700; }
.br-drop-s { font-size: 12px; color: var(--fg-ink-3); }
.br-file-name { margin-top: 4px; font-family: var(--br-mono); font-size: 12.5px; color: var(--fg-green); font-weight: 700; word-break: break-all; }
.br-err { min-height: 16px; margin: 6px 0 0; font-size: 12.2px; color: var(--fg-red); }

/* 规则编辑器 */
.br-rules-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; margin: 16px 0 10px; }
.br-rules-head h3 { margin: 0; font-size: 14px; font-weight: 800; }
.br-rules-head h3 small { margin-left: 6px; font-size: 11.5px; font-weight: 500; color: var(--fg-ink-3); }
.br-mini-btns { display: flex; gap: 6px; }
.br-rule { position: relative; margin-bottom: 10px; padding: 12px 12px 10px; border: 1px solid var(--fg-line);
    border-left: 3px solid var(--fg-brand); border-radius: 10px; background: var(--fg-surface-2); }
.br-rule-h { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.br-rule-h b { font-size: 12px; font-family: var(--br-mono); color: var(--fg-brand-ink); }
.br-rule-del { appearance: none; border: 0; background: none; color: var(--fg-ink-3); font-size: 12px; cursor: pointer; }
.br-rule-del:hover { color: var(--fg-red); }
.br-rule-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 8px; }
.br-rule-row.three { grid-template-columns: 1fr 1fr 1fr; }
.br-lab { display: block; margin-bottom: 4px; font-size: 11.5px; font-weight: 700; color: var(--fg-ink-2); }
.br-input, .br-select { width: 100%; min-width: 0; padding: 8px 10px; font-size: 12.8px; line-height: 1.5;
    color: var(--fg-ink); background: var(--fg-surface); border: 1px solid var(--fg-line-2); border-radius: 8px; outline: none; }
.br-input:focus, .br-select:focus { border-color: var(--fg-brand); box-shadow: 0 0 0 3px var(--fg-brand-soft); }
.br-input.is-bad { border-color: var(--fg-red); }
.br-select--sm { width: auto; max-width: 180px; padding: 5px 8px; font-size: 12px; }
.br-rule-opt { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 12.3px; color: var(--fg-ink-2); }
.br-rule-opt label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }
.br-rule-opt input[type=checkbox] { accent-color: var(--fg-brand); }
.br-note { margin: 10px 0 0; font-size: 12.2px; line-height: 1.85; color: var(--fg-ink-3); }
.br-note code { padding: 1px 4px; border-radius: 4px; background: var(--fg-surface-3); color: var(--fg-brand-ink); }

/* 按钮 */
.br-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 16px; }
.br-actions--out { margin-top: 10px; }
.br-btn { appearance: none; border: 1px solid transparent; border-radius: 9px; padding: 9px 15px; font-size: 13.5px;
    font-weight: 700; cursor: pointer; transition: .15s; background: var(--fg-brand); color: #fff; }
.br-btn:hover:not(:disabled) { background: var(--fg-brand-2); transform: translateY(-1px); }
.br-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.br-btn--ghost { background: var(--fg-surface); color: var(--fg-ink-2); border-color: var(--fg-line-2); }
.br-btn--ghost:hover:not(:disabled) { background: var(--fg-surface-2); color: var(--fg-brand); border-color: var(--fg-brand); }
.br-btn--sm { padding: 6px 12px; font-size: 12.3px; }
:root[data-theme="dark"] .br-btn:not(.br-btn--ghost) { color: #10112a; }

/* 空状态 / 状态条 */
.br-empty { display: flex; flex-direction: column; align-items: center; gap: 8px; padding: 46px 16px; text-align: center; color: var(--fg-ink-3); }
.br-empty-ic { font-size: 34px; font-family: var(--br-mono); color: var(--fg-line-2); }
.br-empty b { font-size: 14px; color: var(--fg-ink-2); }
.br-empty span { font-size: 12.5px; line-height: 1.8; max-width: 380px; }
.br-status { margin-bottom: 12px; padding: 10px 13px; border-radius: 9px; font-size: 12.8px; line-height: 1.8;
    background: var(--fg-green-soft); color: var(--fg-green); font-weight: 700; }
.br-status.is-demo { background: var(--fg-amber-soft); color: var(--fg-amber); }
.br-status.is-error { background: var(--fg-red-soft); color: var(--fg-red); }

/* 统计卡 */
.br-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin-bottom: 14px; }
.br-stat { padding: 10px 12px; border: 1px solid var(--fg-line); border-radius: 10px; background: var(--fg-surface-2); }
.br-stat span { display: block; font-size: 11.5px; color: var(--fg-ink-3); }
.br-stat b { display: block; font-size: 19px; font-weight: 800; color: var(--fg-brand); font-variant-numeric: tabular-nums; }
.br-stat.is-warn b { color: var(--fg-amber); }
.br-stat.is-red b { color: var(--fg-red); }

/* 公式预警 */
.br-alert { margin-bottom: 14px; padding: 12px 14px; border: 1px solid var(--fg-line-2); border-left: 3px solid var(--fg-amber);
    border-radius: 10px; background: var(--fg-amber-soft); font-size: 12.6px; line-height: 1.85; color: var(--fg-ink-2); }
.br-alert b { display: block; margin-bottom: 5px; color: var(--fg-amber); }
.br-alert ul { margin: 0; padding-left: 18px; }

/* 清单表格 */
.br-subh { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin: 18px 0 8px; }
.br-subh h3 { margin: 0; font-size: 14px; font-weight: 800; }
.br-subh h3 span { margin-left: 6px; font-size: 12px; font-weight: 600; color: var(--fg-ink-3); }
.br-filters { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 12px; color: var(--fg-ink-2); }
.br-filters label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }
.br-filters input { accent-color: var(--fg-brand); }
.br-table-wrap { max-height: 380px; overflow: auto; border: 1px solid var(--fg-line); border-radius: 10px; }
.br-table { width: 100%; border-collapse: collapse; font-size: 12.4px; }
.br-table th, .br-table td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--fg-line); vertical-align: top; }
.br-table th { position: sticky; top: 0; z-index: 1; background: var(--fg-surface-3); color: var(--fg-ink); font-weight: 700; white-space: nowrap; }
.br-table td { color: var(--fg-ink-2); }
.br-table tbody tr:last-child td { border-bottom: 0; }
.br-table tr.is-formula { background: var(--fg-amber-soft); }
.br-table .old { color: var(--fg-red); text-decoration: line-through; }
.br-table .new { color: var(--fg-green); font-weight: 700; }
.br-table .cellref { font-family: var(--br-mono); font-weight: 700; color: var(--fg-brand-ink); }
.br-table .tag { display: inline-block; padding: 1px 7px; border-radius: 999px; font-size: 11px;
    background: var(--fg-surface-3); color: var(--fg-ink-2); }
.br-table .tag.warn { background: var(--fg-amber-soft); color: var(--fg-amber); }
.br-table td div.warn-line { margin-top: 3px; font-size: 11.5px; color: var(--fg-amber); }

.br-rule-stats { display: grid; gap: 7px; }
.br-rule-stat { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap;
    padding: 9px 12px; border: 1px solid var(--fg-line); border-radius: 9px; background: var(--fg-surface-2); font-size: 12.4px; }
.br-rule-stat code { color: var(--fg-brand-ink); }
.br-rule-stat em { font-style: normal; color: var(--fg-ink-3); }
.br-warnings { margin: 0; padding-left: 18px; font-size: 12.2px; line-height: 1.85; color: var(--fg-ink-3); }
.br-confirm { display: flex; align-items: flex-start; gap: 8px; margin-top: 18px; padding: 11px 13px;
    border: 1px dashed var(--fg-line-2); border-radius: 10px; background: var(--fg-surface-2);
    font-size: 12.8px; line-height: 1.7; color: var(--fg-ink-2); cursor: pointer; }
.br-confirm input { margin-top: 3px; accent-color: var(--fg-brand); flex: none; }

/* 说明 / FAQ */
.br-prose-card { margin-top: 22px; padding: 24px; border: 1px solid var(--fg-line); border-radius: 14px; background: var(--fg-surface); }
.br-prose-card > h2 { margin: 0 0 14px; font-size: 19px; font-weight: 800; }
.br-prose-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 30px; }
.br-prose-grid h3 { margin: 10px 0 5px; font-size: 14.5px; font-weight: 800; color: var(--fg-brand-ink); }
.br-prose-grid p { margin: 0; font-size: 13.2px; line-height: 1.9; color: var(--fg-ink-2); }
.br-prose-grid code { padding: 1px 5px; border-radius: 4px; background: var(--fg-surface-3); }
.br-faq { margin-top: 18px; display: grid; gap: 8px; }
.br-faq details { padding: 10px 14px; border: 1px solid var(--fg-line); border-radius: 9px; background: var(--fg-surface-2); }
.br-faq summary { cursor: pointer; font-size: 13.5px; font-weight: 700; }
.br-faq details > div { margin-top: 7px; font-size: 12.8px; line-height: 1.85; color: var(--fg-ink-2); }
.br-footer-note { margin-top: 18px; font-size: 12.3px; line-height: 1.85; color: var(--fg-ink-3); }
.br-footer-note a { color: var(--fg-brand); }

/* 轻提示（非弹窗） */
#brToast { position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 14px); z-index: 99999;
    padding: 10px 18px; border-radius: 10px; background: var(--fg-ink); color: var(--fg-surface);
    font-size: 13px; font-weight: 600; box-shadow: var(--fg-shadow); opacity: 0; pointer-events: none; transition: .22s; }
#brToast.show { opacity: 1; transform: translate(-50%, 0); }

/* 本批页面专属：公共推荐卡在窄屏下被长标题撑开 */
@media (max-width: 640px) {
    .tool-rec-grid { grid-template-columns: minmax(0, 1fr); }
    .tool-rec-item { min-width: 0; width: 100%; max-width: 100%; }
    .tool-rec-body b, .tool-rec-body small { min-width: 0; }
}

@media (max-width: 1000px) {
    .br-grid { grid-template-columns: minmax(0, 1fr); }
    .br-out { position: static; }
}
@media (max-width: 760px) {
    .br-wrap { width: min(100% - 26px, 1180px); }
    .br-hero { grid-template-columns: 1fr; gap: 18px; }
    .br-hero-art { max-width: 420px; }
    .br-flow { flex-wrap: wrap; }
    .br-flow-line { display: none; }
    .br-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .br-prose-grid { grid-template-columns: 1fr; }
    .br-card { padding: 16px; }
}
@media (max-width: 480px) {
    .br-rule-row, .br-rule-row.three { grid-template-columns: 1fr; }
    .br-hero h1 { font-size: 26px; }
    .br-diff-row { grid-template-columns: 38px minmax(0, 1fr) 18px minmax(0, 1fr); font-size: 11px; gap: 4px; }
}
@media print { .br-actions, .br-filters, .br-confirm, .br-hero-art, .br-float { display: none !important; } .br-out { position: static; } }
@media (prefers-reduced-motion: reduce) { .br-page * { transition: none !important; animation: none !important; } }