.whitening-content .key{background:var(--mint);border:1px solid #c5e8df;padding:22px 25px;border-radius:10px;margin:28px 0}
.whitening-content .key .label{font-size:11px;letter-spacing:.16em;color:var(--teal);font-weight:bold}
.whitening-content .key p{margin:5px 0 0;color:var(--teal-dark);font-size:17px;line-height:1.8}
.whitening-content .split{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:28px 0}
.whitening-content .split div{padding:19px 20px;border:1px solid var(--border);background:white;border-radius:8px}
.whitening-content .split b{display:block;color:var(--teal-dark);font-size:14px;margin-bottom:7px}
.whitening-content .split p{font-size:13px;margin:0}
.whitening-content .ref{font-size:12px;white-space:nowrap}
.whitening-content .reference{font-size:12px;overflow-wrap:anywhere;scroll-margin-top:20px}
.whitening-content blockquote{margin:24px 0;padding:24px;background:white;border-left:3px solid var(--teal);color:var(--text-secondary)}
.whitening-content .example-label{display:block;color:var(--teal);font-size:12px;margin-bottom:10px}
.whitening-content .explain{margin:30px 0;border:1px solid #d9e7e0;border-radius:14px;background:#fff;overflow:hidden}.whitening-content .fig-top{background:#eff7f3;padding:18px 22px}.whitening-content .fig-top>span{font-size:10px;letter-spacing:.14em;color:#468172}.whitening-content .fig-top h3{font-family:inherit;font-size:18px;font-weight:600;margin:3px 0 0;color:#1d5a50}.whitening-content .mechanism-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:20px}.whitening-content .drawing-card{padding:16px 10px;background:#fafcfb;border:1px solid #e4ede7;border-radius:9px;text-align:center}.whitening-content .pill{display:inline-block;background:#dceddf;color:#2d6658;border-radius:20px;padding:3px 12px;font-size:12px}.whitening-content .pill.sand{background:#f1e6d7;color:#785f42}.whitening-content .drawing-card svg{display:block;width:100%;height:auto;max-height:240px;margin:12px auto}.whitening-content .explain h4{font-size:15px;color:#274e45;margin:8px 0}.whitening-content .drawing-card p,.whitening-content .counsel-grid p{font-size:13px;line-height:1.8;margin:0}.whitening-content .explain figcaption{font-size:11px;color:#6b7771;line-height:1.8;border-top:1px solid #e4ede7;padding:14px 20px}.whitening-content .counsel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:20px}.whitening-content .counsel-grid section{text-align:center;background:#fafcfb;border-radius:8px;padding:14px 7px}.whitening-content .counsel-grid svg{width:85px;height:75px}.whitening-content p{overflow-wrap:anywhere}.whitening-content .reference{line-height:1.85}@media(max-width:580px){.whitening-content .mechanism-grid{grid-template-columns:1fr;padding:14px;gap:14px}.whitening-content .drawing-card svg{max-width:280px}.whitening-content .counsel-grid{grid-template-columns:1fr;padding:14px;gap:10px}.whitening-content .counsel-grid section{display:grid;grid-template-columns:65px 1fr;grid-template-rows:auto auto;text-align:left;padding:13px 17px;column-gap:13px;align-items:center}.whitening-content .counsel-grid svg{width:58px;height:58px;grid-row:1 / 3}.whitening-content .counsel-grid h4{margin:0;align-self:end}.whitening-content .counsel-grid p{align-self:start}.whitening-content .fig-top{padding:15px 18px}.whitening-content .fig-top h3{font-size:17px}.whitening-content .explain{margin:24px 0}.whitening-content .explain figcaption{padding:12px 16px}}

@media(max-width:580px){.whitening-content .split{grid-template-columns:1fr}}
.whitening-content{overflow-wrap:anywhere}.whitening-content svg{max-width:100%}

.whitening-content h2{font-family: "Noto Serif JP",serif;font-size:20px;font-weight:500;line-height:1.7;margin:32px 0 16px;border-left:3px solid var(--teal);padding-left:12px}
.whitening-content h3{border-left:0;padding-left:0}