:root {
  --canvas: #f5f9ff;
  --surface: #ffffff;
  --surface-muted: #eff6ff;
  --ink: #12233f;
  --ink-soft: #475569;
  --line: #cbd5e1;
  --line-strong: #94a3b8;
  --blue: #3b82f6;
  --blue-dark: #2563eb;
  --green: #059669;
  --green-pale: #ecfdf5;
  --amber: #b45309;
  --amber-pale: #fffbeb;
  --shadow: 0 14px 35px rgba(30, 64, 175, 0.08);
  --shadow-soft: 0 4px 16px rgba(15, 23, 42, 0.05);
  --radius: 16px;
  --radius-sm: 10px;
  --max: 1180px;
  --font: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--canvas); color: var(--ink); font-family: var(--font); font-size: 16px; line-height: 1.55; }
a { color: var(--blue-dark); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
button, input, select { font: inherit; }
button { cursor: pointer; }
img, svg { max-width: 100%; }
:focus-visible { outline: 3px solid #f59e0b; outline-offset: 3px; }
.skip-link { position: absolute; left: 16px; top: -48px; z-index: 100; padding: 10px 14px; border-radius: 8px; color: #fff; background: var(--ink); }
.skip-link:focus { top: 12px; }
.container { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }
.narrow { width: min(calc(100% - 40px), 760px); margin: 0 auto; }

.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(203,213,225,.9); backdrop-filter: blur(12px); }
.nav { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 800; letter-spacing: -0.03em; white-space: nowrap; }
.brand-mark { width: 31px; height: 31px; display: grid; place-items: center; border-radius: 8px; color: #fff; background: var(--blue); box-shadow: 0 6px 14px rgba(59,130,246,.24); }
.brand-mark svg { width: 19px; height: 19px; }
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a { color: var(--ink-soft); text-decoration: none; font-size: 14px; font-weight: 650; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--blue-dark); }
.nav-actions { display: flex; gap: 10px; align-items: center; }
.mobile-menu { display: none; }
.button { display: inline-flex; min-height: 42px; align-items: center; justify-content: center; gap: 8px; padding: 9px 16px; border: 1px solid transparent; border-radius: 9px; color: #fff; background: var(--blue); box-shadow: 0 5px 10px rgba(59,130,246,.16); font-size: 14px; font-weight: 760; text-decoration: none; transition: transform .18s ease, background .18s ease; }
.button:hover { color: #fff; background: var(--blue-dark); transform: translateY(-1px); }
.button.secondary { color: var(--ink); background: #fff; border-color: var(--line); box-shadow: none; }
.button.secondary:hover { background: var(--surface-muted); color: var(--ink); }
.button.full { width: 100%; }
.menu-toggle { display: none; padding: 8px; border: 0; color: var(--ink); background: transparent; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

main { min-height: calc(100vh - 220px); }
.hero { padding: 70px 0 40px; }
.eyebrow { margin: 0 0 9px; color: var(--blue-dark); font-size: 12px; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
h1, h2, h3 { color: var(--ink); line-height: 1.12; letter-spacing: -0.035em; }
h1 { max-width: 850px; margin: 0; font-size: clamp(38px, 5vw, 62px); }
h2 { margin: 48px 0 14px; font-size: clamp(25px, 3vw, 34px); }
h3 { margin: 24px 0 8px; font-size: 20px; }
.lede { max-width: 770px; margin: 16px 0 0; color: var(--ink-soft); font-size: clamp(18px, 2vw, 22px); line-height: 1.45; }
.breadcrumbs { display: flex; min-width: 0; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; color: var(--ink-soft); font-size: 13px; }
.breadcrumbs a, .breadcrumbs span { min-width: 0; overflow-wrap: anywhere; }
.breadcrumbs a { color: var(--ink-soft); }
.trust-row { display: flex; flex-wrap: wrap; gap: 15px; margin: 18px 0 0; color: var(--ink-soft); font-size: 14px; }
.trust-row span { display: inline-flex; align-items: center; gap: 7px; }
.trust-row .check { color: var(--green); font-weight: 850; }

.calculator-shell { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 16px; margin: 28px 0 18px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow-soft); }
.card-pad { padding: 26px; }
.card h2, .card h3 { margin-top: 0; }
.form-card { padding: 26px; }
.form-head { display: flex; align-items: start; justify-content: space-between; gap: 15px; }
.form-head h2 { margin: 0; font-size: 25px; }
.form-head p { margin: 4px 0 0; color: var(--ink-soft); font-size: 14px; }
.form-reset { border: 0; color: var(--blue-dark); background: transparent; text-decoration: underline; font-size: 14px; }
.field-tabs { display: flex; overflow-x: auto; margin: 22px 0 18px; border: 1px solid #dbeafe; border-radius: 10px; background: #f8fbff; }
.field-tabs button { min-width: 124px; flex: 1; padding: 10px 12px; border: 0; border-right: 1px solid #e2e8f0; color: var(--ink-soft); background: transparent; font-size: 13px; font-weight: 730; }
.field-tabs button:last-child { border-right: 0; }
.field-tabs button[aria-selected="true"] { color: #fff; background: var(--blue); }
.form-pane { display: none; }
.form-pane.is-active { display: block; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 18px; }
.field { display: grid; gap: 6px; }
.field label, .fieldset-label { font-size: 13px; color: var(--ink); font-weight: 760; }
.field small { margin-top: -2px; color: var(--ink-soft); font-size: 12px; }
.field input, .field select { min-height: 42px; width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: #fff; }
.field input:focus, .field select:focus { border-color: var(--blue); outline: 2px solid rgba(59,130,246,.18); }
.fieldset { margin: 0; padding: 0; border: 0; }
.form-actions { display: flex; gap: 12px; align-items: center; margin-top: 22px; }
.result-card { padding: 26px; background: linear-gradient(135deg, #ffffff, #f8fbff); }
.result-top { display: flex; justify-content: space-between; gap: 14px; align-items: start; }
.result-label { margin: 0; font-weight: 800; font-size: 15px; }
.result-total { margin: 2px 0 0; color: var(--green); font-size: clamp(37px, 4vw, 53px); font-weight: 850; line-height: 1; letter-spacing: -.05em; }
.planning-range { margin: 7px 0 0; color: var(--ink-soft); font-size: 12px; font-weight: 650; }
.pill { display: inline-flex; gap: 7px; align-items: center; padding: 7px 10px; border: 1px solid #a7f3d0; border-radius: 999px; color: #047857; background: var(--green-pale); font-size: 12px; font-weight: 750; white-space: nowrap; }
.result-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 11px; margin: 20px 0; }
.metric { padding: 14px; border: 1px solid #e2e8f0; border-radius: 10px; background: #fff; }
.metric strong { display: block; font-size: 22px; letter-spacing: -.03em; }
.metric span { display: block; margin-top: 3px; color: var(--ink-soft); font-size: 12px; }
.breakdown-title { margin: 0 0 9px; font-size: 15px; font-weight: 800; }
.bar { display: flex; overflow: hidden; height: 22px; border-radius: 7px; background: #e2e8f0; }
.bar span { min-width: 8px; }
.bar .model { background: #3b82f6; }
.bar .rag { background: #2dd4bf; }
.bar .observe { background: #fbbf24; }
.bar .human { background: #f97316; }
.bar .storage { background: #a855f7; }
.dot.human { background: #f97316; }
.breakdown-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-top: 10px; }
.breakdown-item { display: grid; grid-template-columns: 9px 1fr; gap: 7px; color: var(--ink-soft); font-size: 11px; }
.breakdown-item b { grid-column: 2; color: var(--ink); font-size: 13px; }
.dot { width: 9px; height: 9px; margin-top: 4px; border-radius: 50%; }
.recommendation { display: flex; gap: 12px; align-items: center; margin-top: 18px; padding: 14px; border: 1px solid #a7f3d0; border-radius: 10px; background: var(--green-pale); }
.recommendation strong { display: block; color: #047857; font-size: 14px; }
.recommendation p { margin: 1px 0 0; color: #047857; font-size: 13px; }
.result-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 14px; }
.result-actions button { min-height: 36px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: #fff; font-size: 13px; font-weight: 700; }
.result-actions button:hover { background: var(--surface-muted); }

.info-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin: 18px 0 58px; }
.info-card { padding: 20px; }
.info-card h3 { display: flex; gap: 9px; align-items: center; margin: 0 0 6px; font-size: 16px; }
.info-card p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.info-card code { display: block; margin-top: 13px; padding: 9px; overflow: auto; border-radius: 7px; background: #f8fafc; color: var(--ink-soft); font-size: 11px; }
.source-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 11px; }
.source-links a { padding: 6px 8px; border: 1px solid var(--line); border-radius: 7px; color: var(--ink-soft); background: #fff; font-size: 12px; text-decoration: none; }
.source-links a:hover { color: var(--blue-dark); border-color: var(--blue); }

.section { padding: 58px 0; }
.section.alt { border-top: 1px solid #e2e8f0; border-bottom: 1px solid #e2e8f0; background: #fff; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.section-heading h2 { margin: 0; }
.section-heading p { max-width: 570px; margin: 0; color: var(--ink-soft); }
.tool-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
.tool-card { display: flex; min-height: 185px; flex-direction: column; padding: 21px; border: 1px solid var(--line); border-radius: 14px; background: #fff; text-decoration: none; box-shadow: var(--shadow-soft); }
.tool-card:hover { border-color: var(--blue); transform: translateY(-2px); }
.tool-card .icon { display: grid; width: 37px; height: 37px; place-items: center; border-radius: 10px; color: var(--blue-dark); background: var(--surface-muted); font-size: 18px; }
.tool-card h3 { margin: 15px 0 6px; font-size: 19px; }
.tool-card p { margin: 0; color: var(--ink-soft); font-size: 14px; }
.tool-card span { margin-top: auto; padding-top: 15px; color: var(--blue-dark); font-size: 13px; font-weight: 800; }

.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 278px; gap: 56px; align-items: start; }
.content-grid > * { min-width: 0; }
.article { max-width: 760px; }
.article .lede { max-width: 720px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 9px; margin: 13px 0 0; color: var(--ink-soft); font-size: 13px; }
.quick-answer { margin: 24px 0 28px; padding: 18px 20px; border: 1px solid #bfdbfe; border-radius: 10px; background: var(--surface-muted); }
.quick-answer h2 { margin: 0 0 5px; font-size: 16px; }
.quick-answer p { margin: 0; color: #334155; }
.article p { color: #334155; }
.article li { margin: 7px 0; color: #334155; }
.article ul, .article ol { padding-left: 22px; }
.article blockquote { margin: 20px 0; padding: 15px 18px; border-left: 4px solid var(--blue); border-radius: 0 10px 10px 0; background: var(--surface-muted); color: var(--ink); font-weight: 720; }
.article pre { margin: 20px 0; padding: 16px; overflow: auto; border: 1px solid #dbe4ef; border-radius: 10px; background: #0f1f39; color: #e2e8f0; font-size: 13px; line-height: 1.55; }
.article code { padding: 2px 5px; border-radius: 4px; background: #eaf2ff; color: #1e3a5f; font-size: .92em; }
.article pre code { padding: 0; background: transparent; color: inherit; }
.citation { margin-left: 2px; font-size: .78em; font-weight: 800; }
.article-figure { margin: 28px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: var(--shadow-soft); }
.article-figure img { display: block; width: 100%; height: auto; background: #f8fbff; }
.article-figure figcaption { padding: 10px 14px; border-top: 1px solid #e2e8f0; color: var(--ink-soft); font-size: 12px; }
.article-comparison { display: grid; grid-template-columns: 1fr; gap: 18px; margin: 28px 0; }
.article-comparison figure { display: flex; flex-direction: column; min-width: 0; margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: var(--shadow-soft); }
.article-comparison img { display: block; width: 100%; height: auto; background: #f8fbff; }
.article-comparison figcaption { margin-top: auto; padding: 10px 12px; border-top: 1px solid #e2e8f0; color: var(--ink-soft); font-size: 12px; line-height: 1.4; }
.source-list { margin: 38px 0 0; padding: 21px; border: 1px solid #bfdbfe; border-radius: 13px; background: #f8fbff; }
.source-list h2 { margin: 0 0 8px; font-size: 21px; }
.source-list p { margin: 0 0 11px; color: var(--ink-soft); font-size: 13px; }
.source-list ol { margin: 0; padding-left: 22px; }
.source-list li { margin: 7px 0; font-size: 13px; }
.guide-card { min-height: 210px; }
.article table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; }
.article th, .article td { padding: 11px 12px; border: 1px solid #dbe4ef; text-align: left; }
.article th { background: #f8fbff; color: var(--ink); }
.in-article-cta { display: flex; justify-content: space-between; gap: 18px; align-items: center; margin: 30px 0; padding: 20px; border: 1px solid #bfdbfe; border-radius: 13px; background: linear-gradient(110deg,#eff6ff,#fff); }
.in-article-cta h3 { margin: 0; font-size: 19px; }
.in-article-cta p { margin: 4px 0 0; color: var(--ink-soft); font-size: 14px; }
.demo-card { display: grid; grid-template-columns: 1fr 1fr 1fr 1.15fr; gap: 9px; margin: 22px 0; padding: 16px; border: 1px solid var(--line); border-radius: 12px; background: #fff; box-shadow: var(--shadow-soft); }
.demo-field { padding: 8px; border: 1px solid #e2e8f0; border-radius: 7px; color: var(--ink-soft); font-size: 11px; }
.demo-field b { display: block; margin-top: 5px; color: var(--ink); font-size: 16px; }
.demo-result { padding: 10px; border: 1px solid #a7f3d0; border-radius: 8px; background: var(--green-pale); }
.demo-result span { display: block; color: #047857; font-size: 11px; font-weight: 700; }
.demo-result b { display: block; color: var(--green); font-size: 23px; line-height: 1.2; }
.caption { margin: -11px 0 22px; color: var(--ink-soft) !important; font-size: 12px; }
.sidebar { position: sticky; top: 86px; }
.sidebar-card { margin-bottom: 14px; padding: 18px; }
.sidebar-card h2, .sidebar-card h3 { margin: 0 0 9px; font-size: 16px; }
.sidebar-card ul { display: grid; gap: 8px; margin: 0; padding: 0; list-style: none; }
.sidebar-card a { font-size: 13px; text-decoration: none; }
.faq { margin: 32px 0; }
.faq h2 { margin-bottom: 15px; }
.faq details { margin: 8px 0; border: 1px solid var(--line); border-radius: 9px; background: #fff; }
.faq summary { padding: 13px 15px; color: var(--ink); cursor: pointer; font-weight: 720; }
.faq details p { padding: 0 15px 13px; margin: 0; }
.author-card { display: flex; gap: 15px; align-items: start; margin: 30px 0 0; padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.author-avatar { display: grid; flex: 0 0 42px; width: 42px; height: 42px; place-items: center; border-radius: 50%; color: var(--blue-dark); background: var(--surface-muted); font-size: 19px; }
.author-card h2 { margin: 0 0 5px; font-size: 16px; }
.author-card p { margin: 0; font-size: 13px; }

.data-table { width: 100%; border-collapse: collapse; margin: 18px 0; background: #fff; font-size: 14px; }
.data-table th, .data-table td { padding: 12px; border: 1px solid var(--line); vertical-align: top; text-align: left; }
.data-table th { background: #f8fbff; }
.badge { display: inline-block; padding: 4px 7px; border-radius: 999px; color: #075985; background: #e0f2fe; font-size: 11px; font-weight: 750; }
.note { margin: 22px 0; padding: 15px 17px; border-left: 4px solid var(--amber); border-radius: 8px; background: var(--amber-pale); color: #78350f; }
.changelog { display: grid; gap: 14px; margin: 18px 0; }
.change { padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.change time { color: var(--blue-dark); font-size: 12px; font-weight: 800; }
.change h3 { margin: 5px 0; }
.change p { margin: 0; color: var(--ink-soft); }

.site-footer { padding: 44px 0 24px; border-top: 1px solid #dbe4ef; background: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.35fr repeat(3,1fr); gap: 22px; }
.footer-grid h2 { margin: 0 0 8px; font-size: 16px; }
.footer-grid p, .footer-grid a { display: block; margin: 5px 0; color: var(--ink-soft); font-size: 13px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 15px; margin-top: 34px; padding-top: 18px; border-top: 1px solid #e2e8f0; color: var(--ink-soft); font-size: 12px; }
.mobile-nav { display: none; }

@media (max-width: 880px) {
  .nav-links { display: none; }
  .nav-actions .secondary { display: none; }
  .menu-toggle { display: inline-flex; }
  .mobile-menu { display: grid; gap: 0; padding: 8px 20px 14px; border-top: 1px solid #e2e8f0; background: #fff; }
  .mobile-menu[hidden] { display: none; }
  .mobile-menu a { padding: 10px 0; border-bottom: 1px solid #eef2f7; color: var(--ink); font-size: 15px; font-weight: 720; text-decoration: none; }
  .mobile-menu a:last-child { border-bottom: 0; }
  .calculator-shell, .content-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .sidebar-card { margin: 0; }
  .info-grid, .tool-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 620px) {
  body { font-size: 15px; padding-bottom: 68px; }
  .container, .narrow { width: min(calc(100% - 28px), var(--max)); }
  .nav { min-height: 60px; }
  .brand { font-size: 16px; }
  .nav-actions .button { display: none; }
  .hero { padding: 38px 0 23px; }
  h1 { font-size: 38px; }
  h2 { margin-top: 35px; }
  .lede { font-size: 18px; }
  .trust-row { gap: 8px 14px; font-size: 12px; }
  .form-card, .result-card { padding: 18px; }
  .field-tabs { display: none; }
  .form-pane { display: block; margin: 14px 0 20px; padding: 0 0 18px; border-bottom: 1px solid #e2e8f0; }
  .form-pane:last-of-type { border-bottom: 0; }
  .form-pane::before { display: block; margin-bottom: 12px; color: var(--ink); font-size: 16px; font-weight: 800; }
  #pane-workload::before { content: "1  Workload"; }
  #pane-model::before { content: "2  Model usage"; }
  #pane-agent::before { content: "3  Agent behavior"; }
  #pane-rag::before { content: "4  RAG & tools"; }
  .field-grid { grid-template-columns: 1fr; gap: 12px; }
  .result-metrics { grid-template-columns: 1fr 1fr; }
  .result-metrics .metric:last-child { grid-column: span 2; }
  .breakdown-grid { grid-template-columns: 1fr 1fr; }
  .in-article-cta { align-items: start; flex-direction: column; }
  .demo-card { grid-template-columns: 1fr 1fr; }
  .demo-result { grid-column: span 2; }
  .info-grid, .tool-grid, .sidebar { grid-template-columns: 1fr; }
  .section { padding: 42px 0; }
  .section-heading { align-items: start; flex-direction: column; }
  .article table { font-size: 12px; }
  .article th, .article td { padding: 8px; }
  .article-figure { margin: 22px 0; border-radius: 11px; }
  .article-comparison { gap: 12px; margin: 22px 0; }
  .article-comparison figure { border-radius: 11px; }
  .article pre { font-size: 12px; }
  .source-list { padding: 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:first-child { grid-column: span 2; }
  .footer-bottom { align-items: start; flex-direction: column; }
  .mobile-nav { position: fixed; right: 0; bottom: 0; left: 0; z-index: 30; display: grid; grid-template-columns: repeat(3,1fr); padding: 6px 12px; border-top: 1px solid var(--line); background: rgba(255,255,255,.96); backdrop-filter: blur(12px); }
  .mobile-nav a { display: grid; gap: 2px; place-items: center; color: var(--ink-soft); font-size: 11px; text-decoration: none; }
  .mobile-nav a svg { width: 22px; height: 22px; }
  .mobile-nav .mobile-icon { display: grid; width: 22px; height: 22px; place-items: center; color: var(--ink-soft); font-size: 21px; line-height: 1; }
  .mobile-nav a[aria-current="page"] { color: var(--blue-dark); font-weight: 800; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}