/* Website shell only. FCU engineering and simulator styles remain independent. */
:root { --site-accent: #245c76; --site-dark: #153b4e; --site-muted: #53636e; --site-line: #d8e0e5; --site-soft: #eaf1f5; --site-radius: 8px; }
.site-shell { min-height: 100vh; display: flex; flex-direction: column; }
.site-shell [hidden] { display: none !important; }
.site-container { width: min(1180px, calc(100% - 3rem)); margin-inline: auto; }
.foundation-header { background: #fff; border-bottom: 1px solid var(--site-line); }
.header-row { min-height: 84px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.site-brand { display: flex; align-items: center; gap: .7rem; text-decoration: none; color: var(--ink); font-weight: 750; font-size: 1.1rem; }
.brand-mark { background: var(--site-dark); color: #fff; border-radius: 5px; width: 38px; height: 38px; display: grid; place-items: center; font-size: .85rem; letter-spacing: -.03em; }
.primary-nav { display: flex; align-items: center; gap: .35rem; flex-wrap: wrap; }
.primary-nav a { padding: .65rem .85rem; color: var(--site-muted); text-decoration: none; font-size: .9rem; border-radius: 4px; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--site-dark); background: var(--site-soft); }
.foundation-main { flex: 1; padding-block: 2rem 4rem; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: .5rem; color: var(--site-muted); font-size: .875rem; margin-bottom: 1.6rem; }
.breadcrumb a { color: inherit; }
.site-kicker { color: var(--site-accent); text-transform: uppercase; font-size: .75rem; letter-spacing: .12em; font-weight: 750; margin-bottom: .8rem; }
.page-intro { max-width: 760px; margin-bottom: 2rem; }
.page-intro h1 { font-size: clamp(2rem, 4vw, 3rem); }
.page-intro > p:last-child { color: var(--site-muted); font-size: 1.05rem; }
.home-hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 3rem; padding: 1.8rem 0 3rem; align-items: center; }
.home-hero h1 { font-size: clamp(2.4rem, 4.5vw, 3.65rem); line-height: 1.08; max-width: 650px; }
.hero-copy { color: var(--site-muted); max-width: 530px; font-size: 1.05rem; margin-block: 1.3rem; }
.button-row { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1.5rem; }
.site-button { display: inline-flex; align-items: center; justify-content: center; padding: .7rem 1rem; min-height: 44px; background: #fff; border: 1px solid var(--site-line); border-radius: 4px; color: var(--site-dark); text-decoration: none; font-size: .9rem; font-weight: 650; }
.site-button.primary { background: var(--site-accent); color: #fff; border-color: var(--site-accent); }
.site-button:hover { box-shadow: 0 0 0 2px var(--site-line); }
.featured-tool { background: var(--site-dark); color: #fff; padding: 2rem; border-radius: var(--site-radius); }
.featured-tool h2 { font-size: 1.65rem; margin-top: 1.4rem; }
.featured-tool p { color: #d0dfe7; }
.featured-tool .badge { background: #e8f2ef; color: #205745; }
.feature-steps { padding: 0; display: flex; flex-wrap: wrap; list-style: none; gap: .65rem; margin-block: 1.5rem; }
.feature-steps li { padding: .45rem .65rem; border: 1px solid #547283; border-radius: 4px; font-size: .85rem; }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 1rem; margin-bottom: 1.2rem; }
.section-heading h2, .content-section > h2 { font-size: 1.4rem; margin-bottom: .3rem; }
.section-heading p { color: var(--site-muted); margin: 0; }
.section-heading a { font-size: .9rem; }
.content-section { margin-block: 2.5rem; scroll-margin-top: 1rem; }
.tool-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.tool-card { display: flex; flex-direction: column; gap: .8rem; background: #fff; border: 1px solid var(--site-line); border-radius: var(--site-radius); padding: 1.35rem; min-width: 0; }
.card-top { display: flex; justify-content: space-between; align-items: center; gap: .65rem; }
.tool-code { font-family: ui-monospace, Consolas, monospace; font-size: .85rem; font-weight: 700; color: var(--site-accent); }
.badge { display: inline-block; background: #edf1f3; color: #53636e; border-radius: 4px; padding: .2rem .5rem; font-size: .75rem; font-weight: 650; }
.badge.available { color: #205745; background: #e8f2ef; }
.tool-card h3 { font-size: 1.07rem; margin: .25rem 0 0; }
.tool-card p { color: var(--site-muted); font-size: .9rem; margin: 0 0 .4rem; }
.card-link, .card-status { margin-top: auto; font-size: .875rem; font-weight: 650; }
.card-status { color: var(--site-muted); }
.category-label { color: var(--site-muted); font-size: .75rem; }
.catalog-controls { background: #fff; border: 1px solid var(--site-line); border-radius: var(--site-radius); padding: 1.25rem; margin-bottom: 1.3rem; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 1rem; align-items: end; }
.catalog-summary { color: var(--site-muted); font-size: .875rem; }
.empty-state { padding: 2rem; border: 1px dashed var(--site-line); border-radius: var(--site-radius); background: #fff; }
.empty-state h2 { font-size: 1.25rem; }
.workflow-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; padding-block: 1rem; }
.workflow-grid article { border-top: 2px solid var(--site-line); padding-top: 1rem; }
.workflow-grid h3 { margin: .4rem 0; font-size: 1.05rem; }
.workflow-grid p { color: var(--site-muted); font-size: .9rem; }
.step-number { font: .8rem ui-monospace, Consolas, monospace; color: var(--site-accent); }
.ad-slot { min-height: 110px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .3rem; margin-block: 2.5rem; padding: 1rem; background: #edf1f3; border: 1px dashed #bccad3; border-radius: 4px; text-align: center; color: var(--site-muted); font-size: .75rem; }
.ad-slot strong { font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.engineering-notice { border-left: 3px solid var(--site-accent); padding: 1rem 1.2rem; background: var(--site-soft); font-size: .875rem; margin-top: 2rem; }
.engineering-notice strong { display: block; margin-bottom: .25rem; }
.engineering-notice p { margin-bottom: .25rem; }
.foundation-footer { display: block; background: #fff; border-top: 1px solid var(--site-line); padding-block: 2.2rem; margin-top: auto; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 2rem; }
.footer-grid p { max-width: 340px; margin-block: .6rem; }
.footer-grid h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; }
.footer-links { display: flex; flex-direction: column; align-items: flex-start; gap: .5rem; }
.footer-links a { color: var(--site-muted); }
.footer-bottom { border-top: 1px solid var(--site-line); margin-top: 1.8rem; padding-top: 1rem; display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem; font-size: .75rem; }
.calculator-layout { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 1.25rem; align-items: stretch; }
.site-panel { padding: 1.5rem; background: #fff; border: 1px solid var(--site-line); border-radius: var(--site-radius); min-width: 0; }
.site-panel h2 { font-size: 1.2rem; }
.layout-notice { padding: 1rem 1.2rem; background: #fff8e8; border: 1px solid #dcc796; border-radius: 5px; font-size: .9rem; margin-bottom: 1.5rem; }
.layout-notice p:last-child { margin-bottom: 0; }
.preview-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 0 0 1.5rem; }
.preview-fields legend { grid-column: 1 / -1; }
.result-placeholder { min-height: 180px; display: grid; place-content: center; text-align: center; color: var(--site-muted); border: 1px dashed #bccad3; border-radius: 5px; padding: 1.5rem; margin-top: 1.2rem; }
.result-placeholder strong { display: block; color: var(--ink); margin-bottom: .5rem; }
.result-list { padding-left: 1.2rem; color: var(--site-muted); font-size: .9rem; }
.page-toc { display: flex; flex-wrap: wrap; gap: .6rem 1.2rem; border-block: 1px solid var(--site-line); padding-block: .9rem; margin-block: 2rem; font-size: .875rem; }
.detail-columns { display: grid; grid-template-columns: minmax(0, 2fr) minmax(240px, 1fr); gap: 2rem; }
.detail-columns .content-section:first-child { margin-top: 0; }
.parts-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1rem; }
.part-card { border: 1px solid var(--site-line); border-radius: 5px; padding: 1.2rem; background: #fff; }
.part-card h3 { font-size: 1rem; margin-block: .8rem .5rem; }
.part-card p { color: var(--site-muted); font-size: .875rem; }
.part-card .badge { font-size: .75rem; }
.section-note { color: var(--site-muted); font-size: .875rem; }
.faq details { border-bottom: 1px solid var(--site-line); padding-block: .5rem; }
.faq summary { font-weight: 600; }
.faq p { color: var(--site-muted); }
.prose-layout { display: grid; grid-template-columns: 230px minmax(0, 760px); gap: 3rem; align-items: start; }
.side-nav { display: flex; flex-direction: column; gap: .2rem; }
.side-nav a { color: var(--site-muted); text-decoration: none; padding: .6rem .8rem; border-radius: 4px; font-size: .9rem; }
.side-nav a[aria-current="page"] { background: var(--site-soft); color: var(--site-dark); font-weight: 650; }
.prose { background: #fff; padding: 2rem; border: 1px solid var(--site-line); border-radius: var(--site-radius); }
.prose section + section { margin-top: 2rem; }
.prose h2 { font-size: 1.25rem; }
.prose p, .prose li { color: var(--site-muted); }
.prose li { margin-block: .4rem; }
.simulator-shell .foundation-main { padding-top: 1.5rem; }
.simulator-shell .engineering-notice { margin-bottom: 2rem; }
@media (max-width: 900px) {
  .home-hero { gap: 1.5rem; }
  .tool-grid, .parts-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .prose-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 1.5rem; }
  .detail-columns { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .site-container { width: calc(100% - 2rem); }
  .header-row { flex-direction: column; align-items: flex-start; padding-block: 1rem .6rem; gap: .7rem; }
  .primary-nav { width: 100%; gap: .1rem; }
  .primary-nav a { padding: .65rem .7rem; }
  .home-hero, .calculator-layout, .workflow-grid, .prose-layout, .footer-grid, .catalog-controls { grid-template-columns: 1fr; }
  .home-hero { padding-top: .5rem; }
  .featured-tool, .prose { padding: 1.4rem; }
  .tool-grid, .parts-grid { grid-template-columns: 1fr; }
  .side-nav { flex-direction: row; flex-wrap: wrap; gap: .1rem; }
  .side-nav a { padding: .5rem .65rem; }
  .foundation-main { padding-top: 1.4rem; }
  .preview-fields { grid-template-columns: 1fr; }
  .footer-grid { gap: 1.5rem; }
}
@media print { .foundation-header, .foundation-footer, .ad-slot, .catalog-controls { display: none; } .site-container { width: 100%; } }