/* SEO/GEO 课程：在 lesson → taste → seo 的组件与令牌上补充正文、练习和图集。 */
[data-theme="dark"]{--ct:#aaa2ff;--ct-deep:#d0cbff;--ct-soft:rgba(170,162,255,.12);--ct-line:rgba(170,162,255,.35)}
[data-theme="dark"] .sc-button{color:#171329}
[data-theme="dark"] .sc-button.secondary{color:var(--ct-deep)}
.sc-breadcrumb{display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:12px;margin-bottom:22px;color:var(--sub)}
.sc-breadcrumb a,.sc-sources a,.sc-next a,.sc-outline a{color:var(--ct-deep);text-decoration:none}
.sc-breadcrumb a:hover,.sc-sources a:hover,.sc-next a:hover,.sc-outline a:hover{text-decoration:underline}
.sc-meta{font-size:12px;color:var(--sub);margin-top:16px;line-height:1.8}
.sc-brief{padding:17px 20px;background:var(--ct-soft);border:1px solid var(--ct-line);border-radius:12px;margin:22px 0}
.sc-brief strong{display:block;color:var(--ct-deep);font-size:12px;margin-bottom:6px}
.sc-brief p{font-size:15px;line-height:1.9}
.sc-outline{border:1px solid var(--border);border-radius:12px;margin:22px 0;padding:14px 18px;font-size:13px;background:var(--card)}
.sc-outline summary{cursor:pointer;font-weight:700;color:var(--ct-deep);min-height:24px}
.sc-outline ol{padding-left:22px;columns:2;column-gap:32px;line-height:2.1;margin-top:12px}
.sc-outline li{break-inside:avoid;padding:2px 0}
.sc-section{scroll-margin-top:90px}
.sc-section h2{font-size:19px;line-height:1.55;color:var(--text);margin:36px 0 14px;letter-spacing:-.25px}
.sc-section p,.sc-steps p{font-size:15px;line-height:1.95;color:var(--text);margin:12px 0;overflow-wrap:anywhere}
.sc-author-intro p{font-size:15px;line-height:1.95;color:var(--sub);margin:12px 0}
.sc-author-passage ul,.sc-author-passage ol{padding-left:23px;margin:14px 0}
.sc-author-passage li{font-size:15px;line-height:1.95;margin:12px 0;color:var(--text);overflow-wrap:anywhere}
.sc-author-passage h3{font-size:16px;line-height:1.8;margin:24px 0 12px;color:var(--ct-deep)}
.sc-point-anchor{display:block;scroll-margin-top:90px}
.sc-figure{scroll-margin-top:75px}
.sc-figure-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:start}
.sc-figure-pair .sc-figure{margin-top:16px}
.sc-teaching-extras{margin:32px 0;padding:18px 20px;border:1px solid var(--ct-line);border-radius:14px;background:var(--card)}
.sc-teaching-extras>summary{min-height:28px;cursor:pointer;font-size:15px;font-weight:700;color:var(--ct-deep);line-height:1.8}
.sc-teaching-extras[open]>summary{margin-bottom:16px}
.sc-section code{background:var(--code-bg);padding:2px 5px;border-radius:4px;font-size:.88em}
.sc-section pre{white-space:pre-wrap;overflow-wrap:anywhere;padding:18px;border-radius:12px;background:var(--card-2);border:1px solid var(--border);font-size:12.5px;line-height:1.8}
.sc-section pre code{background:none;padding:0}
.sc-ref{font-size:12px!important;color:var(--sub)!important}
.sc-ref a{color:var(--ct-deep)}
.sc-note{background:var(--card-2);border-left:3px solid var(--ct);padding:13px 16px;border-radius:0 8px 8px 0;font-size:13px;line-height:1.85;color:var(--sub);margin:18px 0}
.sc-figure{margin:26px 0;border:1px solid var(--border);border-radius:14px;background:#fff;overflow:hidden}
.sc-figure img{display:block;width:100%;height:auto;max-height:540px;object-fit:contain;background:#fff}
.sc-image-link{display:block;text-decoration:none;color:inherit}
.sc-figure figcaption{padding:12px 16px;color:var(--sub);font-size:12px;line-height:1.8;background:var(--card)}
.sc-section .toy{margin:20px 0}
.sc-quiz fieldset{border:0;min-width:0}
.sc-quiz legend{font-size:15px;font-weight:750;line-height:1.7;margin-bottom:12px}
.sc-option{display:flex;gap:10px;align-items:flex-start;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:13px;margin:9px 0;cursor:pointer;font-size:14px;line-height:1.7}
.sc-option:hover{border-color:var(--ct-line)}
.sc-option:has(input:checked){border-color:var(--ct);background:var(--ct-soft)}
.sc-option input{accent-color:var(--ct);margin-top:5px;flex-shrink:0}
.sc-button{min-height:42px;padding:10px 17px;border-radius:9px;border:1px solid var(--ct);background:var(--ct);color:#fff;font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.sc-button.secondary{background:var(--card);color:var(--ct-deep);border-color:var(--ct-line)}
.sc-button:hover{filter:brightness(.94)}
.sc-button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--ct);outline-offset:3px}
.sc-feedback{margin-top:14px;padding:13px 15px;border-radius:10px;background:var(--card-2);font-size:13px;line-height:1.85;min-height:54px;color:var(--text)}
.sc-feedback[data-state="correct"]{border:1px solid var(--success)}
.sc-feedback[data-state="retry"]{border:1px solid var(--amber)}
.sc-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.sc-field{display:block;min-width:0;font-size:13px;font-weight:700;color:var(--text)}
.sc-field.wide{grid-column:1/-1}
.sc-field span{display:block;margin-bottom:7px;line-height:1.7}
.sc-field input,.sc-field textarea{width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:9px;background:var(--card);color:var(--text);font:inherit;font-size:13px;line-height:1.7;min-height:44px}
.sc-field textarea{resize:vertical;min-height:95px}
.sc-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.sc-output{margin:16px 0 0;white-space:pre-wrap;overflow-wrap:anywhere;background:var(--card-2);padding:16px;border:1px solid var(--border);border-radius:10px;font-family:inherit;font-size:13px;line-height:1.85;max-height:560px;overflow:auto}
.sc-search-preview{margin:18px 0;padding:17px;border:1px solid var(--border);border-radius:12px;background:var(--card)}
.sc-search-preview strong{font-size:18px;font-weight:500;color:var(--ct-deep);line-height:1.6;display:block;overflow-wrap:anywhere}
.sc-search-preview p{font-size:13px;line-height:1.8;color:var(--sub);margin-top:7px}
.sc-steps{padding:18px 22px;border:1px solid var(--ct-line);border-radius:14px;background:var(--card)}
.sc-steps ol{padding-left:22px}
.sc-steps li{padding:8px 0;font-size:14px;line-height:1.9}
.sc-steps li strong{display:block;color:var(--ct-deep)}
.sc-steps .sc-deliverable{border-top:1px solid var(--border);padding-top:14px;font-size:14px}
.sc-sources{font-size:12px;color:var(--sub);line-height:1.9;padding:22px 0;border-top:1px solid var(--border);margin-top:34px}
.sc-sources ul{padding-left:19px;margin:10px 0}
.sc-next{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:28px 0 10px}
.sc-next a{padding:16px;border:1px solid var(--border);border-radius:12px;background:var(--card);font-size:14px;line-height:1.7}
.sc-next small{display:block;color:var(--sub);margin-bottom:6px}
.sc-next .next{text-align:right}
.sc-check-group{margin:20px 0}
.sc-check-group h3{font-size:15px;color:var(--ct-deep);margin-bottom:10px}
.sc-check-item{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;margin:8px 0;border:1px solid var(--border);border-radius:10px;background:var(--card);font-size:13px;line-height:1.8;cursor:pointer}
.sc-check-item input{margin-top:6px;accent-color:var(--ct)}
.sc-check-progress{font-size:14px;line-height:1.8;color:var(--ct-deep);padding:12px 0;font-weight:700}
.sc-gallery-grid,.sc-guide-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:26px 0}
.sc-guide-card{display:block;padding:22px;border:1px solid var(--border);border-radius:14px;background:var(--card);text-decoration:none;color:var(--text);transition:border-color .15s,transform .15s}
.sc-guide-card:hover{border-color:var(--ct-line);transform:translateY(-2px)}
.sc-guide-card small{font-size:12px;color:var(--ct-deep);font-weight:700}
.sc-guide-card h2{font-size:18px;line-height:1.6;margin:10px 0}
.sc-guide-card p{font-size:13px;line-height:1.85;color:var(--sub)}
.sc-gallery-grid figure{margin:0;align-self:start}
.sc-table-wrap{overflow:auto;border:1px solid var(--border);border-radius:10px;margin:18px 0}
.sc-table{width:100%;border-collapse:collapse;min-width:450px;font-size:13px;line-height:1.8}
.sc-table th,.sc-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}
.sc-table th{background:var(--card-2);color:var(--ct-deep)}
.sc-table tr:last-child td{border-bottom:0}
@media(max-width:600px){.sc-outline ol{columns:1}.sc-form-grid,.sc-gallery-grid,.sc-guide-grid,.sc-next,.sc-figure-pair{grid-template-columns:1fr}.sc-next .next{text-align:left}.sc-section h2{font-size:18px}.sc-figure{margin:20px 0}.sc-steps{padding:15px}.sc-breadcrumb{margin-bottom:18px}.sc-button{min-height:44px}}
@media(prefers-reduced-motion:reduce){.sc-guide-card{transition:none}.sc-guide-card:hover{transform:none}}