/* BlueprintLab Visual Content System v0.1 — preview, 2026-09-12
   Nielsen: visibility, recognition, consistency, error prevention
   O'Reilly IA: organization, labeling, navigation, contextual discovery
   TRON HMI: consistent parts, layout, operation flow and safety cues */

body.blt-vcs{
  --vcs-accent:var(--brand,#315ce7);
  --vcs-accent-soft:color-mix(in srgb,var(--vcs-accent) 8%,var(--surface,#fff));
  --vcs-accent-line:color-mix(in srgb,var(--vcs-accent) 22%,var(--line,#dce3ee));
  --vcs-info:#2563eb;
  --vcs-success:#14815c;
  --vcs-warning:#a15c07;
  --vcs-danger:#b42318;
  --vcs-radius:12px;
  --vcs-readable:820px;
  --vcs-content:980px;
}

/* Shared page identity: page types differ, but the grammar stays the same. */
body.blt-vcs.home-premium .hero,
body.blt-vcs-reference .tool-hero{
  position:relative;
  overflow:hidden;
  padding:34px 0 30px!important;
  color:var(--ink)!important;
  border-top:0!important;
  border-bottom:1px solid var(--line)!important;
  background:
    linear-gradient(color-mix(in srgb,var(--vcs-accent) 5%,transparent) 1px,transparent 1px),
    linear-gradient(90deg,color-mix(in srgb,var(--vcs-accent) 5%,transparent) 1px,transparent 1px),
    linear-gradient(135deg,color-mix(in srgb,var(--vcs-accent) 4%,var(--surface)),var(--surface))!important;
  background-size:32px 32px,32px 32px,auto!important;
}
body.blt-vcs.home-premium .hero::before,
body.blt-vcs.home-premium .hero::after{display:none!important}
body.blt-vcs.home-premium .hero h1,
body.blt-vcs.home-premium .hero-accent{color:var(--ink)!important;-webkit-text-fill-color:currentColor!important}
body.blt-vcs.home-premium .hero-subline{color:var(--muted)!important;max-width:780px}
body.blt-vcs .hero .eyebrow,
body.blt-vcs .tool-kicker{
  color:var(--vcs-accent)!important;
  font-weight:800;
  letter-spacing:.07em;
}
body.blt-vcs .hero .eyebrow{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  margin:0 0 10px;
  padding:5px 9px;
  border:1px solid var(--vcs-accent-line);
  border-radius:999px;
  background:var(--vcs-accent-soft);
  font-size:11px;
}

/* Consistent information components */
.blt-vcs-summary,
.blt-vcs-answer,
.blt-vcs-context-card{
  border:1px solid var(--vcs-accent-line);
  border-radius:var(--vcs-radius);
  background:var(--vcs-accent-soft);
}
.blt-vcs-summary{margin:0 0 24px;padding:18px 20px}
.blt-vcs-summary-head{display:flex;align-items:flex-start;gap:12px}
.blt-vcs-summary-icon{
  display:grid;place-items:center;flex:0 0 32px;width:32px;height:32px;
  border-radius:9px;background:var(--vcs-accent);color:#fff;font-size:16px;font-weight:800;
}
.blt-vcs-summary h2,.blt-vcs-summary h3{margin:1px 0 5px;font-size:16px;line-height:1.5}
.blt-vcs-summary p{margin:0;color:var(--muted);line-height:1.75}
.blt-vcs-summary strong{color:var(--ink)}
.blt-vcs-choice-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:14px}
.blt-vcs-choice{
  padding:10px 12px;border:1px solid var(--line);border-radius:9px;background:var(--surface);
  font-size:13px;line-height:1.65;color:var(--muted)
}
.blt-vcs-choice b{display:block;margin-bottom:2px;color:var(--ink);font-size:13px}

.blt-vcs-toc{
  margin:0 0 26px;padding:16px 18px;border:1px solid var(--line);border-radius:var(--vcs-radius);background:var(--surface)
}
.blt-vcs-toc strong{display:block;margin-bottom:8px;font-size:13px}
.blt-vcs-toc ol{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0;padding-left:20px;color:var(--muted);font-size:13px}
.blt-vcs-toc a{text-decoration:none}
.blt-vcs-toc a:hover{text-decoration:underline}

.blt-vcs-callout{
  margin:18px 0;padding:14px 16px;border-left:4px solid var(--vcs-info);border-radius:8px;
  background:color-mix(in srgb,var(--vcs-info) 6%,var(--surface));line-height:1.75
}
.blt-vcs-callout[data-kind="warning"]{border-left-color:var(--vcs-warning);background:color-mix(in srgb,var(--vcs-warning) 7%,var(--surface))}
.blt-vcs-callout[data-kind="success"]{border-left-color:var(--vcs-success);background:color-mix(in srgb,var(--vcs-success) 7%,var(--surface))}
.blt-vcs-callout-title{display:block;margin-bottom:3px;font-weight:800;color:var(--ink)}

/* Guides: readable article first, cards only where they encode meaning. */
body.blt-vcs-guide .premium-section{padding:30px 0 58px}
body.blt-vcs-guide .premium-section>.wrap.blt-article{max-width:var(--vcs-content)}
body.blt-vcs-guide .blt-article-section{
  margin:0;padding:30px 0;background:transparent;border:0;border-top:1px solid var(--line);border-radius:0
}
body.blt-vcs-guide .blt-article-section:first-of-type{border-top:0;padding-top:8px}
body.blt-vcs-guide .blt-article-section h2{position:relative;margin:0 0 14px;padding-left:14px;font-size:clamp(20px,2.5vw,25px);line-height:1.45}
body.blt-vcs-guide .blt-article-section h2::before{
  content:"";position:absolute;left:0;top:.28em;width:4px;height:1.05em;border-radius:3px;background:var(--vcs-accent)
}
body.blt-vcs-guide .blt-article-section h3{font-size:17px}
body.blt-vcs-guide .blt-article-section p,
body.blt-vcs-guide .blt-article-section li{max-width:var(--vcs-readable);font-size:15.5px;line-height:1.92}
body.blt-vcs-guide .blt-article-section ul,
body.blt-vcs-guide .blt-article-section ol{max-width:var(--vcs-readable)}
body.blt-vcs-guide .blt-article-section pre{max-width:var(--vcs-readable)}
body.blt-vcs-guide .blt-vcs-related-section{
  margin-top:18px;padding:22px;border:1px solid var(--line);border-radius:var(--vcs-radius);background:var(--surface)
}
body.blt-vcs-guide .blt-vcs-related-section h2{padding-left:0}
body.blt-vcs-guide .blt-vcs-related-section h2::before{display:none}
body.blt-vcs-guide .blt-related-named{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
body.blt-vcs-guide .blt-related-named li{
  padding:12px 14px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2)
}
body.blt-vcs-guide .blt-related-named a{text-decoration:none;color:var(--ink)}
body.blt-vcs-guide .blt-related-named a:hover{color:var(--vcs-accent)}

/* Tool page: the work surface remains first; explanation is scannable and contextual. */
body.blt-vcs-tool .blt-content-depth{padding:8px 0 18px}
body.blt-vcs-tool .blt-content-depth .wrap{gap:12px}
body.blt-vcs-tool .blt-content-depth-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
body.blt-vcs-tool .blt-content-card{
  position:relative;padding:18px 18px 18px 20px;border-radius:10px;box-shadow:none;background:var(--surface);overflow:hidden
}
body.blt-vcs-tool .blt-content-card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--line-strong)
}
body.blt-vcs-tool .blt-content-card[data-kind="use"]::before{background:var(--vcs-accent)}
body.blt-vcs-tool .blt-content-card[data-kind="know"]::before{background:var(--vcs-info)}
body.blt-vcs-tool .blt-content-card[data-kind="care"]::before{background:var(--vcs-warning)}
body.blt-vcs-tool .blt-content-card[data-kind="example"]::before{background:var(--vcs-success)}
body.blt-vcs-tool .blt-card-kicker{
  margin:0 0 5px;color:var(--muted);font-size:11px;font-weight:800;letter-spacing:.06em;text-transform:uppercase
}
body.blt-vcs-tool .blt-content-card h2{margin:0 0 7px;font-size:16px;line-height:1.5}
body.blt-vcs-tool .blt-content-card p,
body.blt-vcs-tool .blt-content-card li{font-size:14px;line-height:1.78}
body.blt-vcs-tool .blt-guide-bridge{
  display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:18px;
  margin-top:2px;padding:18px 20px;border:1px solid var(--vcs-accent-line);border-radius:10px;background:var(--vcs-accent-soft)
}
body.blt-vcs-tool .blt-guide-bridge .blt-guide-label{display:inline-block;margin-bottom:4px;color:var(--vcs-accent);font-size:11px;font-weight:800;letter-spacing:.06em}
body.blt-vcs-tool .blt-guide-bridge strong{display:block;font-size:15px}
body.blt-vcs-tool .blt-guide-bridge p{margin:4px 0 0;color:var(--muted);font-size:13px;line-height:1.65}
body.blt-vcs-tool .blt-guide-bridge a{
  display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:9px 13px;
  border:1px solid var(--vcs-accent-line);border-radius:8px;background:var(--surface);font-size:13px;font-weight:800;text-decoration:none;white-space:nowrap
}
body.blt-vcs-tool .blt-guide-bridge a:hover{border-color:var(--vcs-accent);color:var(--vcs-accent)}

/* Reference: answer first, explanation second. */
body.blt-vcs-reference .tool-hero{padding-top:26px!important}
body.blt-vcs-reference .tool-heading>.tool-icon{display:grid;width:44px;height:44px;border-radius:11px}
body.blt-vcs-reference .tool-heading h1{font-size:clamp(28px,4vw,38px)}
body.blt-vcs-reference .section{padding-top:22px}
body.blt-vcs-reference .ref-detail-layout{max-width:var(--vcs-content)}
.blt-vcs-answer{margin:0 0 14px;padding:16px 18px}
.blt-vcs-answer-label{margin:0 0 5px;color:var(--vcs-accent);font-size:11px;font-weight:800;letter-spacing:.07em}
.blt-vcs-answer p{margin:0;font-size:14px;line-height:1.75}
.blt-vcs-answer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:12px}
.blt-vcs-answer-item{padding:10px 12px;border-radius:8px;background:var(--surface);border:1px solid var(--line)}
.blt-vcs-answer-item small{display:block;color:var(--muted);font-size:11px}
.blt-vcs-answer-item strong{display:block;margin-top:2px;font-size:14px}
body.blt-vcs-reference .ref-primary-card{border-radius:10px;box-shadow:none}

/* About: same editorial grammar, no meaningless review timestamp. */
body.blt-vcs-about .premium-section>.wrap.blt-article{max-width:var(--vcs-content)}
body.blt-vcs-about .blt-article-section{border-radius:10px;box-shadow:none}

/* Explicit freshness metadata — only add on pages where freshness changes the answer. */
.blt-vcs-freshness{
  display:inline-flex;align-items:center;gap:6px;margin-top:12px;padding:5px 8px;border-radius:7px;
  background:var(--surface-2);color:var(--muted);font-size:12px
}

@media(max-width:800px){
  .blt-vcs-choice-grid,.blt-vcs-answer-grid{grid-template-columns:1fr}
  body.blt-vcs-guide .blt-related-named{grid-template-columns:1fr}
  body.blt-vcs-tool .blt-content-depth-grid{grid-template-columns:1fr}
  body.blt-vcs-tool .blt-guide-bridge{grid-template-columns:1fr}
  body.blt-vcs-tool .blt-guide-bridge a{justify-self:start;white-space:normal}
}
@media(max-width:480px){
  body.blt-vcs.home-premium .hero,body.blt-vcs-reference .tool-hero{padding:24px 0 22px!important}
  .blt-vcs-summary,.blt-vcs-answer{padding:14px}
  body.blt-vcs-guide .blt-article-section{padding:24px 0}
}
body.blt-vcs-guide .blt-vcs-emphasis-warning{
  margin:12px 0 24px;padding:22px 22px 24px;border:1px solid color-mix(in srgb,var(--vcs-warning) 24%,var(--line));
  border-left:4px solid var(--vcs-warning);border-radius:10px;background:color-mix(in srgb,var(--vcs-warning) 5%,var(--surface))
}
body.blt-vcs-guide .blt-vcs-emphasis-warning h2{padding-left:0}
body.blt-vcs-guide .blt-vcs-emphasis-warning h2::before{display:none}
@media(max-width:600px){
  body.blt-vcs .site-header .header-inner,
  body.blt-vcs.home-premium .site-header .header-inner{
    display:flex;flex-wrap:wrap;gap:6px 10px;padding:8px 0
  }
  body.blt-vcs .site-header .brand,
  body.blt-vcs.home-premium .site-header .brand{min-width:0;flex:1 1 auto}
  body.blt-vcs .site-header .brand-name,
  body.blt-vcs.home-premium .site-header .brand-name{
    max-width:none;white-space:nowrap;font-size:13px;line-height:1.2
  }
  body.blt-vcs .site-header .header-actions,
  body.blt-vcs.home-premium .site-header .header-actions{margin-left:auto;flex:0 0 auto}
  body.blt-vcs .site-header .rd-nav,
  body.blt-vcs.home-premium .site-header .rd-nav{
    order:3;width:100%;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:2px;
    margin:2px 0 0;padding-top:6px;border-top:1px solid var(--line)
  }
  body.blt-vcs .site-header .rd-nav a,
  body.blt-vcs.home-premium .site-header .rd-nav a{
    justify-content:center;min-height:34px;padding:4px;font-size:12px;white-space:nowrap
  }
}


/* Deep Guide table grammar — v1.30.0 */
body.blt-vcs-deep-guide .hero .eyebrow{background:color-mix(in srgb,var(--vcs-success) 8%,var(--surface));border-color:color-mix(in srgb,var(--vcs-success) 24%,var(--line));color:var(--vcs-success)!important}
.blt-vcs-table-wrap{max-width:var(--vcs-readable);margin:18px 0 8px;overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.blt-vcs-decision-table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.55}
.blt-vcs-decision-table th,.blt-vcs-decision-table td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.blt-vcs-decision-table th{background:var(--surface-2);font-size:12px;font-weight:800;white-space:nowrap}
.blt-vcs-decision-table tr:last-child td{border-bottom:0}
body.blt-vcs-deep-guide .blt-article-section h3{margin-top:22px}
@media(max-width:600px){.blt-vcs-decision-table{min-width:620px}.blt-vcs-decision-table th,.blt-vcs-decision-table td{padding:9px 10px}}

/* CSV cluster tool guide links — v1.31.0 */
.blt-vcs-tool-guide-links{list-style:none;margin:.7rem 0 0;padding:0;display:grid;gap:.45rem}.blt-vcs-tool-guide-links li{margin:0}.blt-vcs-tool-guide-links a{display:inline-flex;align-items:center;min-height:2rem;font-weight:650;text-decoration:none}.blt-vcs-tool-guide-links a:hover{text-decoration:underline}