.chem-guide,.chem-unlock{--rd-accent:var(--brand);overflow-wrap:anywhere;word-break:keep-all}
.chem-guide{margin-top:40px}
.chem-guide>.rd-nav{margin-bottom:12px}
.chem-expand{min-height:44px}
.chem-section{margin-top:48px;scroll-margin-top:80px}
.chem-section h2,.chem-deep>h2{margin:0 0 12px;font-size:23px;line-height:1.4;letter-spacing:-.5px}
.chem-guide p,.chem-unlock p{color:var(--sub);font-size:15px;line-height:1.85}
.chem-person{margin:24px 0 12px;font-size:17px}
.chem-detail{margin:12px 0;border:1px solid var(--line);border-radius:var(--r);background:var(--card);overflow:hidden}
.chem-detail summary{min-height:44px;padding:20px 24px;cursor:pointer;list-style:none}
.chem-detail summary::-webkit-details-marker{display:none}
.chem-detail summary>span{display:block;font-size:17px;font-weight:700;line-height:1.5}
.chem-detail summary>span::after{content:'＋';float:right;color:var(--brand);margin-left:8px}
.chem-detail[open] summary>span::after{content:'−'}
.chem-detail summary>small{display:block;margin-top:6px;color:var(--mut);font-size:13px;line-height:1.6}
.chem-detail summary:focus-visible{outline:2px solid var(--brand);outline-offset:-4px}
.chem-detail-body{padding:0 24px 24px}
.chem-detail-body p:first-child{margin-top:0}
.chem-detail-body p:last-child{margin-bottom:0}
.chem-detail-body blockquote{margin:20px 0;padding:14px 18px;border-left:3px solid var(--brand);background:var(--card2);color:var(--ink);font-size:15px;line-height:1.85}
.chem-detail-body ol{padding-left:22px;color:var(--sub);font-size:15px;line-height:1.85}
.chem-detail-body li+li{margin-top:10px}
.chem-level{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:16px}
.chem-source{display:inline-block;margin-top:9px;font-size:12px;color:var(--brand)}
.chem-unlock{margin-top:48px;padding-top:28px;border-top:1px solid var(--line);scroll-margin-top:80px}
.chem-unlock h2{font-size:23px;line-height:1.4;margin:0 0 12px}
.chem-upgrade-actions{display:grid;gap:10px;margin:22px 0 16px}
.chem-upgrade-actions .cta,.chem-upgrade-actions .btn.full{max-width:none;margin:0;min-height:44px}
.chem-preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:24px}
.chem-preview-card{min-width:0;padding:22px;border:1px solid var(--line);border-radius:var(--r);background:var(--card)}
.chem-preview-card h3{font-size:17px;margin:0 0 8px;line-height:1.5}
.chem-preview-card p{margin:0;min-height:56px;font-size:13px}
.chem-preview-art{filter:blur(5px);opacity:.55;user-select:none;pointer-events:none;margin:24px 0}
.chem-preview-art>i{display:block;height:9px;border-radius:999px;background:var(--mut);margin:12px 0;width:95%}
.chem-preview-art>i:nth-child(2){width:70%;background:var(--brand)}
.chem-preview-art>i:nth-child(3){width:82%}
.chem-preview-art>div{display:flex;gap:9px;height:64px;align-items:flex-end;margin-top:24px}
.chem-preview-art b{display:block;flex:1;height:45%;background:var(--brand);border-radius:var(--r-sm)}
.chem-preview-art b:nth-child(2){height:90%}.chem-preview-art b:nth-child(3){height:62%}.chem-preview-art b:nth-child(4){height:78%}
.chem-return{margin:24px 0}
.chem-return[hidden]{display:none}
@media(max-width:599px){.chem-preview-grid{grid-template-columns:1fr}.chem-section{margin-top:36px}.chem-detail summary{padding:18px 20px}.chem-detail-body{padding:0 20px 20px}}