/* 18 · 小苏打与泡打粉区别 —— 视觉母题「烘焙工作台」：陶土橙 / 面粉纸 / 双罐对照
   独立色板与版式：三列比对、罐形插画、测试卡，与夜空页无任何共用组件。 */
.t28.bs-wrap {
    --t28-bg: #faf5ec;
    --t28-surface: #fffdf9;
    --t28-surface-2: #f4ead9;
    --t28-ink: #35291f;
    --t28-sub: #6a5543;
    --t28-muted: #9b856f;
    --t28-line: #e6d8c3;
    --t28-accent: #b45f2d;
    --t28-accent-2: #4f8a5b;
    --t28-soft: #f9e9d7;
    --t28-on-accent: #fffdf9;
    --t28-ok: #3f7a4c;
    --t28-warn: #a36a12;
    --t28-danger: #b4452f;
    --t28-ok-soft: #e5f1e2;
    --t28-warn-soft: #f9edcf;
    --t28-danger-soft: #fbe4de;
    --t28-radius: 14px;
    --t28-radius-sm: 8px;
    --t28-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Georgia, serif;
    --t28-shadow: 0 3px 0 rgba(180, 95, 45, .08), 0 10px 28px rgba(112, 78, 44, .08);
    --t28-shadow-lift: 0 8px 0 rgba(180, 95, 45, .1), 0 18px 40px rgba(112, 78, 44, .16);
}
:root[data-theme="dark"] .t28.bs-wrap {
    --t28-bg: #17120e;
    --t28-surface: #211a14;
    --t28-surface-2: #2a2018;
    --t28-ink: #f6e9d8;
    --t28-sub: #d4bda4;
    --t28-muted: #a58e76;
    --t28-line: #3c2e22;
    --t28-accent: #eda870;
    --t28-accent-2: #8ecb9b;
    --t28-soft: #3a291c;
    --t28-on-accent: #211a14;
    --t28-ok: #8ecb9b;
    --t28-warn: #e5bc70;
    --t28-danger: #f09a86;
    --t28-ok-soft: #203222;
    --t28-warn-soft: #3b2e18;
    --t28-danger-soft: #3d211c;
    --t28-shadow: 0 8px 28px rgba(0, 0, 0, .4);
}

.bs-hero {
    display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 26px; align-items: center; padding: 34px 0 26px;
}
.bs-hero h1 em { display: block; font-style: normal; font-size: .52em; color: var(--t28-accent-2); margin-top: 9px; letter-spacing: .01em; }
.bs-wrap .t28-eyebrow { border-radius: 6px; letter-spacing: .06em; }

/* 两个陶罐：纯 CSS 绘制，无图片 */
.bs-jars { display: flex; align-items: center; justify-content: center; gap: 12px; min-height: 190px;
    background: repeating-linear-gradient(0deg, transparent 0 22px, rgba(180,95,45,.05) 22px 23px);
    border: 1px dashed var(--t28-line); border-radius: 14px; padding: 18px 10px; }
.bs-jar {
    position: relative; width: 96px; min-height: 126px; padding: 26px 8px 12px;
    display: flex; flex-direction: column; align-items: center; justify-content: flex-end; gap: 3px;
    border-radius: 10px 10px 16px 16px; text-align: center;
    box-shadow: inset 0 -10px 18px rgba(0,0,0,.07), var(--t28-shadow);
}
.bs-jar-a { background: linear-gradient(160deg, #f4e7cd, #e4cda6); color: #6a4a25; }
.bs-jar-b { background: linear-gradient(160deg, #dbe9d7, #b9d3b6); color: #2f5a38; }
.bs-jar .bs-lid { position: absolute; top: -8px; left: 8px; right: 8px; height: 16px; border-radius: 6px 6px 3px 3px; background: currentColor; opacity: .65; }
.bs-jar b { font-size: 15px; }
.bs-jar small { font-size: 10.5px; opacity: .75; }
.bs-jar i { font-style: normal; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; background: rgba(255,255,255,.66); }
.bs-vs { width: 42px; height: 42px; flex: none; display: grid; place-items: center; border-radius: 50%;
    background: var(--t28-accent); color: var(--t28-on-accent); font-weight: 800; font-size: 14px;
    box-shadow: 0 6px 16px rgba(180,95,45,.3); }

/* 换算器：结果以大号数字突出 */
.bs-calc { border-left: 5px solid var(--t28-accent); }
.bs-answer { margin-top: 18px; padding: 18px; border-radius: 10px; background: var(--t28-soft); }
.bs-answer[hidden] { display: none; }
.bs-big { font-size: clamp(28px, 5vw, 40px); font-weight: 800; color: var(--t28-accent); line-height: 1.25; letter-spacing: -.03em; }
.bs-big small { font-size: 15px; font-weight: 600; color: var(--t28-sub); }
.bs-formula { font-family: var(--t28-mono); font-size: 13px; color: var(--t28-sub); background: var(--t28-surface);
    border: 1px dashed var(--t28-line); border-radius: 8px; padding: 10px 12px; margin-top: 12px; }

/* 三列对照 */
.bs-compare { display: grid; grid-template-columns: minmax(0, 1fr) 90px minmax(0, 1fr); gap: 14px; align-items: stretch; }
.bs-side { padding: 22px; border-radius: 14px; border: 2px solid var(--t28-line); background: var(--t28-surface); }
.bs-side h3 { font-size: 20px; margin-bottom: 4px; }
.bs-side-a { border-top: 5px solid #d9a863; }
.bs-side-b { border-top: 5px solid #79a87e; }
.bs-side-sub { font-size: 13px; color: var(--t28-muted); margin-bottom: 14px; }
.bs-side ul { padding-left: 18px; margin: 0; }
.bs-side li { font-size: 14.5px; line-height: 1.75; margin-bottom: 9px; }
.bs-mid { display: grid; place-items: center; text-align: center; font-size: 12px; font-weight: 700;
    color: var(--t28-accent); writing-mode: vertical-rl; letter-spacing: .12em; }

/* 失效自检卡 */
.bs-tests { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.bs-test { display: flex; flex-direction: column; gap: 6px; text-align: left; cursor: pointer;
    padding: 18px 20px; border-radius: 12px; border: 1.5px solid var(--t28-line);
    background: var(--t28-surface); color: var(--t28-ink); font-family: inherit; }
.bs-test:hover { border-color: var(--t28-accent); transform: translateY(-2px); }
.bs-test-ic { font-size: 20px; color: var(--t28-accent); font-weight: 800; }
.bs-test b { font-size: 16px; }
.bs-test small { font-size: 13px; color: var(--t28-muted); line-height: 1.6; }
.bs-test-answer { margin-top: 6px; padding: 9px 11px; border-radius: 8px; background: var(--t28-warn-soft);
    color: var(--t28-warn); font-size: 13.5px; line-height: 1.65; }
.bs-test-answer[hidden] { display: none; }
.bs-reading .t28-prose { columns: 2; column-gap: 34px; }
.bs-reading .t28-prose p { break-inside: avoid; }

@media (max-width: 860px) {
    .bs-hero { grid-template-columns: minmax(0, 1fr); }
    .bs-compare { grid-template-columns: minmax(0, 1fr); }
    .bs-mid { writing-mode: horizontal-tb; padding: 4px; }
    .bs-tests, .bs-reading .t28-prose { grid-template-columns: minmax(0, 1fr); columns: auto; }
}
@media (max-width: 520px) {
    .bs-jars { min-height: 150px; }
    .bs-jar { width: 84px; min-height: 110px; }
    .bs-vs { width: 34px; height: 34px; font-size: 12px; }
    .bs-side { padding: 16px; }
}