/* v1.1 integration layer. Preview controls and brand placeholders are NOT site UI. */
.vt-preview :focus-visible{outline-color:var(--vt-category-accent)}
.vt-preview .hero-icon{background:linear-gradient(145deg,var(--vt-category-tint),var(--vt-category-soft));color:var(--vt-category-accent)}
.vt-preview .eyebrow-row{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:11px}
.vt-preview .eyebrow{margin-bottom:0;background:#f1f5f3;color:#4c6259}
.vt-preview .category-label{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--vt-card-border);background:var(--vt-card-soft);color:var(--vt-card-accent);border-radius:99px;padding:3px 9px;font-size:10px;font-weight:700;letter-spacing:.025em}
.vt-preview .category-label svg{width:12px;height:12px}
.vt-preview .tabs{background:var(--vt-category-soft)}
.vt-preview .tab:hover{background:var(--vt-category-tint);color:var(--vt-category-accent)}
.vt-preview .tab[aria-selected=true]{color:white;background:linear-gradient(110deg,var(--vt-category-accent),var(--vt-category-hover));box-shadow:0 2px 4px rgba(var(--vt-category-rgb),.10)}
.vt-preview .primary-button{background:linear-gradient(110deg,var(--vt-category-accent),var(--vt-category-hover));border-color:var(--vt-category-accent)}
.vt-preview .input-wrap:focus-within{border-color:var(--vt-category-accent);box-shadow:0 0 0 3px rgba(var(--vt-category-rgb),.12)}
.vt-preview .input-wrap:has(input[aria-invalid=true]){border-color:var(--vt-error)}
.vt-preview .result-box{background:linear-gradient(115deg,var(--vt-category-soft),var(--vt-category-tint));border-color:var(--vt-category-border)}
.vt-preview .result-context,.vt-preview .result-formula{color:var(--vt-category-deep)}
.vt-preview .result-toolbar,.vt-preview .result-toolbar button{color:var(--vt-category-accent)}
.vt-preview .result-number{color:var(--vt-category-deep)}
.vt-preview .result-box.is-stale{background:#f4f6f5;border-color:#e0e5e2}
.vt-preview .step-number{background:var(--vt-category-soft);color:var(--vt-category-accent)}
.vt-preview .formula-panel{background:var(--vt-category-soft);color:var(--vt-category-deep)}
.vt-preview .formula-panel svg{color:var(--vt-category-accent)}
.vt-preview .guide-visual{background:linear-gradient(160deg,var(--vt-category-soft),var(--vt-category-tint));color:var(--vt-category-accent)}
.vt-preview .guide-visual svg,.vt-preview .math-glyph{color:var(--vt-category-accent)}
.vt-preview .guide-card:hover{border-color:var(--vt-category-border)}
.vt-preview .art-daily{background:linear-gradient(120deg,var(--vt-category-tint),var(--vt-category-soft));color:var(--vt-category-accent)}
.vt-preview .art-sale{background:linear-gradient(115deg,var(--vt-category-soft),#fff8ee);color:var(--vt-category-accent)}
.vt-preview .article-art .art-number,.vt-preview .article-art svg{color:var(--vt-category-accent)}
.vt-preview .toast{background:var(--vt-category-deep);border-color:var(--vt-category-accent)}
/* Complete the semantic accents while keeping typography and alerts neutral. */
.vt-preview .card-action,.vt-preview .content-type{color:var(--vt-category-accent)}
.vt-preview .guide-card h3,.vt-preview .formula-panel span,.vt-preview .example-equation{color:var(--vt-category-deep)}
.vt-preview .guide-card{background:linear-gradient(115deg,#ffffff,var(--vt-category-soft));border-color:var(--vt-category-border)}
.vt-preview .example-button strong{color:var(--vt-category-deep)}
.vt-preview .example-button:hover{background:var(--vt-category-soft);border-color:var(--vt-category-border)}
.vt-preview .faq summary{color:#354c59}.vt-preview .faq details p{color:#536774}
/* Related/search cards use their OWN category, never the page colour or their position. */
.vt-preview .tool-card[data-category] .small-icon,.vt-preview .search-icon{color:var(--vt-card-accent);background:var(--vt-card-soft)}
.vt-preview .tool-card[data-category] .small-icon svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.vt-preview .tool-card[data-category] .card-action,.vt-preview .tool-card[data-category]{color:var(--vt-card-accent)}
.vt-preview .tool-card h3{color:var(--vt-ink)}
.vt-preview .tool-card[data-category]:hover{border-color:var(--vt-card-border)}
.vt-preview .search-icon{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;flex-shrink:0}
.vt-preview .search-icon svg{width:20px;height:20px}
.vt-preview .search-result>span:nth-child(2){flex:1;min-width:0}
.vt-preview .search-result>svg{color:var(--vt-card-accent)}
.vt-preview .search-result strong{color:var(--vt-ink)}
.vt-preview .search-result small{color:#60717c}
.vt-preview .search-result[data-category]:hover{background:var(--vt-card-soft)}
.vt-preview .topic-menu a>svg{color:var(--vt-card-accent)}
/* The actual approved logo must be resolved in the global shell pack. */
.vt-preview .brand-name{font-size:25px;font-weight:790;letter-spacing:.065em;line-height:1.15;color:#20343d}
.vt-preview .brand-reference{display:flex;flex-direction:column;gap:5px}
.vt-preview .brand-status{font-size:9px;line-height:1.15;color:#75838d;letter-spacing:.035em;font-weight:500}
.vt-preview .footer-brand .brand-name{font-size:20px}
.vt-preview .footer-brand p{max-width:265px}
.vt-preview .header-inner{height:82px}
.vt-preview .preview-strip{background:#f7f9f9;border-bottom:1px solid #e5eaea;color:#637480}
.vt-preview .preview-strip .wrap{min-height:43px;gap:16px;padding-top:5px;padding-bottom:5px}
.vt-preview .preview-context{display:flex;align-items:center;gap:12px;font-size:10px;font-weight:600}
.vt-preview .preview-actions{display:flex;align-items:center;gap:18px}
.vt-preview .preview-strip .preview-actions button{display:inline-flex;gap:6px;align-items:center;min-height:32px;color:#314a59;font-size:11px;padding:2px}
.vt-preview .preview-strip .preview-actions button:hover{color:var(--vt-category-accent)}
.vt-preview .preview-strip .preview-actions svg{width:15px;height:15px}
.vt-preview .active-palette{font-size:10px;display:inline-flex;align-items:center;gap:6px;color:var(--vt-category-accent);background:var(--vt-category-soft);padding:3px 8px;border-radius:5px;white-space:nowrap}
.vt-preview .active-palette:before{content:'';display:inline-block;width:6px;height:6px;background:currentColor;border-radius:50%}
.vt-preview .palette-preview-notice{background:var(--vt-category-soft);border-bottom:1px solid var(--vt-category-border);font-size:12px}
.vt-preview .palette-preview-notice .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:9px;padding-bottom:9px}
.vt-preview .palette-preview-notice button{border:0;background:none;color:var(--vt-category-accent);font-size:11px;font-weight:650;padding:5px 0;text-decoration:underline;text-underline-offset:3px}
.vt-preview .palette-dialog{width:min(690px,calc(100% - 32px))}
.vt-preview .palette-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:22px 0}
.vt-preview .palette-choice{border:1px solid var(--vt-card-border);border-radius:13px;display:flex;align-items:flex-start;flex-direction:column;gap:8px;background:#fff;padding:16px;text-align:left;color:var(--vt-ink);min-width:0;position:relative;transition:box-shadow .15s,transform .15s}
.vt-preview .palette-choice:hover{box-shadow:var(--vt-shadow);transform:translateY(-2px)}
.vt-preview .palette-choice[aria-pressed=true]{outline:2px solid var(--vt-card-accent);outline-offset:2px;background:var(--vt-card-soft)}
.vt-preview .palette-choice:focus-visible{outline:3px solid #273c4b;outline-offset:4px}
.vt-preview .palette-choice .palette-glyph{width:39px;height:39px;background:var(--vt-card-soft);color:var(--vt-card-accent);display:grid;place-items:center;border-radius:10px}
.vt-preview .palette-choice strong{font-size:13px;line-height:1.4;color:var(--vt-card-accent)}
.vt-preview .palette-choice code{font-size:10px;color:#6a7582}
.vt-preview .palette-choice small{font-size:10px;color:#596977}
.vt-preview .palette-choice .palette-check{position:absolute;right:13px;top:14px;width:16px;height:16px;color:var(--vt-card-accent)}
.vt-preview .palette-choice[aria-pressed=false] .palette-check{visibility:hidden}
.vt-preview .palette-explanation{padding:12px 14px;border-radius:10px;background:#f6f8f8;font-size:12px!important;color:#526675}
.vt-preview .palette-rule{font-size:11px!important;margin-bottom:0!important;color:#657781}
.vt-preview .reference-notice{padding:18px 23px;background:#f6f8f8;font-size:12px!important;margin:0!important;line-height:1.6!important}
/* Distinct, keyboard-accessible quick-view and full-article actions. */
.vt-preview article.article-card{text-align:left;cursor:default;display:flex;flex-direction:column;align-items:stretch;transform:none}
.vt-preview .article-card h3 a{color:var(--vt-ink)}
.vt-preview .article-card h3 a:hover{color:var(--vt-category-accent);text-decoration:underline;text-underline-offset:3px}
.vt-preview .article-card .article-actions{display:flex;align-items:flex-start;justify-content:space-between;flex-wrap:wrap;gap:7px;margin-top:auto;padding-top:13px}
.vt-preview .quick-view-button{display:inline-flex;align-items:center;justify-content:center;gap:4px;background:var(--vt-category-soft);border:1px solid var(--vt-category-border);border-radius:7px;padding:7px 9px;min-height:36px;color:var(--vt-category-accent);font-size:11px!important;font-weight:650;line-height:1.3}
.vt-preview .quick-view-button:hover{background:var(--vt-category-tint)}
.vt-preview .quick-view-button svg{width:14px;height:14px}
.vt-preview .article-read-link{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:650;min-height:36px;line-height:1.4;padding:6px 0}
.vt-preview .article-read-link:hover{text-decoration:underline;text-underline-offset:4px}
.vt-preview .article-read-link svg{width:13px;height:13px}
.vt-preview .quick-reading-eyebrow{font-size:11px!important;color:var(--vt-category-accent);font-weight:650;letter-spacing:.025em}
.vt-preview .quick-reading-actions{border-top:1px solid var(--vt-border);padding-top:18px;margin-top:24px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.vt-preview .primary-reading-link{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:12px 17px;border-radius:9px;background:var(--vt-category-accent);color:#fff;font-size:13px;font-weight:650;min-height:44px;line-height:1.4}
.vt-preview .primary-reading-link:hover{background:var(--vt-category-hover)}
.vt-preview .primary-reading-link svg{width:16px;height:16px}
.vt-preview .quick-reading-actions .local-link-note{font-size:11px;color:#6a7882}
/* Full article demonstration: a reading state, not the final Article Master. */
.vt-preview .full-reading{padding-bottom:55px}
.vt-preview .reading-breadcrumb{display:flex;align-items:center;gap:14px;flex-wrap:wrap;font-size:12px;padding:26px 0;color:#697a84}
.vt-preview .reading-breadcrumb a{display:inline-flex;align-items:center;gap:7px;font-weight:650}
.vt-preview .reading-breadcrumb svg{transform:rotate(180deg);width:15px;height:15px}
.vt-preview .reading-demo-note{display:flex;align-items:flex-start;gap:9px;background:#f7f8f9;border:1px dashed #d6dfe3;border-radius:10px;padding:12px 15px}
.vt-preview .reading-demo-note p{font-size:12px;line-height:1.7}
.vt-preview .reading-demo-note svg{width:15px;height:15px;color:#69808b;margin-top:3px}
.vt-preview .reading-header{max-width:780px;margin:45px 0 38px}
.vt-preview .reading-kicker{display:inline-block;font-size:10px;font-weight:700;letter-spacing:.12em;color:var(--vt-category-accent);margin-bottom:14px}
.vt-preview .reading-header h1{font-size:clamp(32px,4vw,53px);line-height:1.1;max-width:780px}
.vt-preview .reading-lead{font-size:18px;line-height:1.65;margin-top:17px}
.vt-preview .reading-layout{display:grid;grid-template-columns:230px minmax(0,760px);gap:62px;align-items:start}
.vt-preview .reading-toc{position:sticky;top:24px;border-top:2px solid var(--vt-category-accent);padding-top:17px}
.vt-preview .reading-toc h2{font-size:15px}
.vt-preview .reading-toc ol{list-style:none;padding:0;margin:17px 0 24px;counter-reset:toc}
.vt-preview .reading-toc li{counter-increment:toc;display:flex;align-items:baseline;gap:10px;margin-bottom:15px;font-size:12px;line-height:1.6}
.vt-preview .reading-toc li:before{content:counter(toc,decimal-leading-zero);color:#8b969d;font-size:10px;font-variant-numeric:tabular-nums}
.vt-preview .reading-toc a{color:#4e6571}.vt-preview .reading-toc a:hover{color:var(--vt-category-accent)}
.vt-preview .reading-toc>p{font-size:11px;line-height:1.7;border-top:1px solid #e5e9ed;padding-top:16px}
.vt-preview .reading-prose section{margin-bottom:35px;scroll-margin-top:24px}
.vt-preview .reading-prose h2{font-size:26px;line-height:1.23;margin-bottom:18px;letter-spacing:-.025em}
.vt-preview .reading-prose p{font-size:16px;line-height:1.9;margin-bottom:17px;color:#415863}
.vt-preview .reading-formula{font-size:14px;font-weight:650;color:var(--vt-category-deep);background:var(--vt-category-soft);border-left:3px solid var(--vt-category-accent);border-radius:0 9px 9px 0;padding:19px 21px;line-height:1.8;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.vt-preview .reading-callout{display:flex;gap:23px;max-width:1052px;margin-top:23px;background:var(--vt-category-soft);border:1px solid var(--vt-category-border);padding:30px;border-radius:18px}
.vt-preview .reading-callout-icon{width:56px;height:56px;flex-shrink:0;display:grid;place-items:center;border-radius:12px;background:#fff;color:var(--vt-category-accent)}
.vt-preview .reading-callout-icon svg{width:29px;height:29px}
.vt-preview .reading-callout h2{font-size:24px}.vt-preview .reading-callout p{font-size:14px;line-height:1.8;max-width:680px;margin:11px 0 18px}
.vt-preview .reading-section-number{font-size:10px;color:var(--vt-category-accent);font-weight:700;letter-spacing:.1em;display:block;margin-bottom:9px}
@media(max-width:1080px){.vt-preview .preview-context{gap:8px}.vt-preview .preview-actions{gap:12px}.vt-preview .reading-layout{grid-template-columns:205px minmax(0,1fr);gap:35px}.vt-preview .article-card .article-actions{flex-direction:column;align-items:flex-start;gap:2px}.vt-preview .reading-prose h2{font-size:24px}}
@media(max-width:860px){.vt-preview .header-inner{height:72px;gap:23px}.vt-preview .brand-name{font-size:23px}.vt-preview .brand-status{font-size:8px}.vt-preview .desktop-nav{gap:20px}.vt-preview .active-palette{display:none}.vt-preview article.article-card{display:grid;grid-template-columns:92px minmax(0,1fr);grid-template-rows:auto auto 1fr;column-gap:13px}.vt-preview .article-card .article-art{grid-column:1;grid-row:1/4;min-height:130px}.vt-preview .article-card h3,.vt-preview .article-card p,.vt-preview .article-card .article-actions{grid-column:2}.vt-preview .article-card .article-actions{padding-top:10px;flex-direction:row;gap:4px}.vt-preview .reading-layout{grid-template-columns:1fr;gap:26px}.vt-preview .reading-toc{position:static;display:none}.vt-preview .reading-header{margin-top:32px}.vt-preview .palette-preview-notice .wrap{font-size:11px}}
@media(max-width:620px){.vt-preview .preview-strip .wrap{align-items:flex-start;flex-direction:column;gap:3px;padding-top:7px;padding-bottom:6px}.vt-preview .preview-actions{width:100%;justify-content:space-between;gap:12px}.vt-preview .preview-context{font-size:9px;width:100%;justify-content:space-between}.vt-preview .active-palette{display:inline-flex;font-size:9px;padding:2px 6px}.vt-preview .preview-strip .preview-actions button{font-size:10px;min-height:27px}.vt-preview .preview-strip .preview-actions svg{width:13px;height:13px}.vt-preview .header-inner{height:68px;gap:10px}.vt-preview .brand-name{font-size:21px}.vt-preview .brand-status{font-size:8px;letter-spacing:.01em}.vt-preview .header-actions{gap:2px}.vt-preview .eyebrow-row{gap:5px;margin-bottom:9px}.vt-preview .category-label{font-size:8px;padding:2px 7px}.vt-preview .category-label svg{width:10px;height:10px}.vt-preview .eyebrow{font-size:8px;padding:2px 7px}.vt-preview .hero-icon{margin-top:28px}.vt-preview .palette-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.vt-preview .palette-choice{padding:13px;gap:7px}.vt-preview .palette-choice strong{font-size:12px}.vt-preview .palette-preview-notice .wrap{flex-direction:column;align-items:flex-start;gap:4px}.vt-preview .palette-preview-notice button{font-size:10px}.vt-preview .article-card .article-actions{flex-direction:row;align-items:center;column-gap:9px;row-gap:3px}.vt-preview .quick-view-button{font-size:10px!important;padding:7px 8px}.vt-preview .article-read-link{font-size:10px}.vt-preview article.article-card{grid-template-columns:76px minmax(0,1fr);column-gap:12px}.vt-preview .article-card .article-art{min-height:137px}.vt-preview .quick-reading-actions{align-items:flex-start;flex-direction:column}.vt-preview .primary-reading-link{font-size:12px;width:100%;min-height:44px}.vt-preview .reading-breadcrumb{font-size:11px;padding:22px 0}.vt-preview .reading-demo-note{padding:11px 12px}.vt-preview .reading-demo-note p{font-size:11px}.vt-preview .reading-header{margin:30px 0}.vt-preview .reading-header h1{font-size:34px}.vt-preview .reading-lead{font-size:16px;margin-top:14px}.vt-preview .reading-prose h2{font-size:23px}.vt-preview .reading-prose p{font-size:15px;line-height:1.85}.vt-preview .reading-formula{font-size:13px;padding:16px}.vt-preview .reading-callout{padding:22px;gap:15px;flex-direction:column}.vt-preview .reading-callout h2{font-size:23px}.vt-preview .reading-callout p{font-size:13px}.vt-preview .reading-callout-icon{width:45px;height:45px}.vt-preview .reading-callout-icon svg{width:25px;height:25px}.vt-preview .reference-notice{padding:15px 18px;font-size:11px!important}.vt-preview .search-result strong{font-size:13px}.vt-preview .search-icon{width:32px;height:32px}.vt-preview .search-result{padding-left:4px;padding-right:4px;gap:10px}}
@media(max-width:355px){.vt-preview .brand-name{font-size:19px}.vt-preview .brand-status{font-size:7px}.vt-preview .header-actions{gap:0}.vt-preview .header-inner{gap:6px}.vt-preview .hero-icon{display:none}.vt-preview .article-card .article-actions{flex-direction:column;align-items:flex-start}.vt-preview article.article-card{grid-template-columns:60px minmax(0,1fr);column-gap:10px}.vt-preview .article-card .article-art{min-height:154px}.vt-preview .preview-context{gap:4px}.vt-preview .reading-header h1{font-size:31px}}
@media(prefers-reduced-motion:reduce){.vt-preview .palette-choice,.vt-preview .primary-button,.vt-preview .tool-card{transition:none!important;transform:none!important}}
@media print{.vt-preview .palette-preview-notice,.vt-preview dialog,.vt-preview .reading-demo-note,.vt-preview .reading-toc,.vt-preview .reading-callout{display:none!important}.vt-preview .reading-layout{display:block}.vt-preview .reading-header h1{font-size:32px}.vt-preview .reading-prose section{break-inside:avoid}}