:root {
  --ink: #0f172a;
  --slate-900: #172033;
  --slate-800: #263247;
  --slate-700: #3b4961;
  --slate-600: #526078;
  --slate-500: #6b7890;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --teal-800: #115e59;
  --teal-700: #0f766e;
  --teal-600: #0d9488;
  --teal-100: #ccfbf1;
  --teal-50: #f0fdfa;
  --amber-800: #92400e;
  --amber-100: #fef3c7;
  --red-700: #b91c1c;
  --red-50: #fef2f2;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px rgb(15 23 42 / 0.08);
  --shadow-md: 0 18px 50px rgb(15 23 42 / 0.12);
  --radius-sm: 0.5rem;
  --radius: 0.9rem;
  --radius-lg: 1.4rem;
  --shell: 74rem;
  --content: 48rem;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; }
a { color: var(--teal-800); text-underline-offset: 0.18em; }
a:hover { color: var(--teal-600); }
button, input { font: inherit; }

:focus-visible {
  outline: 3px solid var(--teal-600);
  outline-offset: 3px;
}

.shell { width: min(calc(100% - 2rem), var(--shell)); margin-inline: auto; }
.content-width { max-width: var(--content); }
.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; }
.skip-link { position: fixed; top: 0.7rem; left: 0.7rem; z-index: 1000; transform: translateY(-160%); padding: 0.7rem 1rem; background: var(--ink); color: var(--white); border-radius: var(--radius-sm); }
.skip-link:focus { transform: translateY(0); color: var(--white); }

.site-header { border-bottom: 1px solid var(--slate-200); background: rgb(255 255 255 / 0.96); position: sticky; top: 0; z-index: 50; backdrop-filter: blur(14px); }
.header-inner { min-height: 5rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: inline-flex; align-items: center; gap: 0.8rem; color: var(--ink); text-decoration: none; }
.brand:hover { color: var(--ink); }
.brand-mark { display: grid; place-items: center; width: 2.55rem; height: 2.55rem; border-radius: 0.72rem; background: var(--teal-700); color: var(--white); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.06em; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 1rem; line-height: 1.25; }
.brand small { color: var(--slate-600); font-size: 0.75rem; line-height: 1.4; }
.site-nav { display: flex; align-items: center; gap: 1.4rem; }
.site-nav a { color: var(--slate-700); font-size: 0.92rem; font-weight: 650; text-decoration: none; }
.site-nav a:hover { color: var(--teal-700); }
.nav-toggle { display: none; border: 1px solid var(--slate-300); border-radius: var(--radius-sm); background: var(--white); padding: 0.5rem 0.75rem; color: var(--ink); font-weight: 700; }

.review-banner { background: var(--amber-100); color: var(--amber-800); border-bottom: 1px solid #fcd34d; font-size: 0.88rem; }
.review-banner .shell { padding-block: 0.55rem; }

.hero { position: relative; overflow: hidden; background: linear-gradient(145deg, var(--slate-50) 0%, var(--white) 48%, var(--teal-50) 100%); border-bottom: 1px solid var(--slate-200); }
.hero::before { content: ""; position: absolute; width: 28rem; height: 28rem; border-radius: 50%; right: -12rem; top: -13rem; background: rgb(13 148 136 / 0.08); }
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr); gap: clamp(3rem, 8vw, 7rem); align-items: center; padding-block: clamp(4rem, 9vw, 7.5rem); }
.eyebrow { margin: 0 0 0.7rem; color: var(--teal-700); font-size: 0.76rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
h1, h2, h3 { color: var(--slate-900); line-height: 1.13; letter-spacing: -0.025em; }
h1 { margin: 0; font-size: clamp(2.45rem, 6vw, 4.8rem); max-width: 13ch; }
h2 { margin: 2.5rem 0 0.85rem; font-size: clamp(1.7rem, 3.5vw, 2.55rem); }
h3 { margin: 1.6rem 0 0.6rem; font-size: 1.28rem; }
.hero-copy { max-width: 39rem; color: var(--slate-700); font-size: clamp(1.05rem, 2vw, 1.24rem); line-height: 1.7; }
.button-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-block: 1.8rem; }
.button { display: inline-flex; min-height: 2.8rem; align-items: center; justify-content: center; padding: 0.68rem 1.05rem; border: 1px solid transparent; border-radius: 0.65rem; font-weight: 750; line-height: 1.2; text-decoration: none; cursor: pointer; }
.button-primary { background: var(--teal-700); color: var(--white); box-shadow: var(--shadow-sm); }
.button-primary:hover { background: var(--teal-800); color: var(--white); }
.button-secondary { border-color: var(--slate-300); background: var(--white); color: var(--slate-800); }
.button-secondary:hover { border-color: var(--teal-600); color: var(--teal-800); }
.button-quiet { border-color: transparent; background: transparent; color: var(--slate-700); }
.button-quiet:hover { background: var(--slate-100); }
.trust-list { display: flex; flex-wrap: wrap; gap: 0.55rem 1.5rem; padding: 0; margin: 1.8rem 0 0; color: var(--slate-600); font-size: 0.9rem; list-style: none; }
.trust-list li::before { content: ""; display: inline-block; width: 0.48rem; height: 0.48rem; margin-right: 0.5rem; border-radius: 50%; background: var(--teal-600); vertical-align: 0.08rem; }
.hero-panel { padding: 1.45rem; border: 1px solid var(--slate-200); border-radius: var(--radius-lg); background: rgb(255 255 255 / 0.9); box-shadow: var(--shadow-md); }
.panel-label { margin: 0 0 1rem; color: var(--slate-600); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.formula-card, .formula-result { padding: 1rem; border-radius: var(--radius); }
.formula-card { border: 1px solid var(--slate-200); background: var(--slate-50); }
.formula-card span, .formula-result span { display: block; color: var(--slate-600); font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
.formula-card strong, .formula-result strong { display: block; margin-top: 0.3rem; font-family: var(--font-mono); font-size: 0.88rem; line-height: 1.5; }
.formula-plus { padding-block: 0.25rem; color: var(--slate-500); font-size: 1.25rem; text-align: center; }
.formula-result { margin-top: 0.7rem; background: var(--teal-700); color: var(--white); }
.formula-result span { color: var(--teal-100); }
.fine-print { color: var(--slate-600); font-size: 0.82rem; }

.section { padding-block: clamp(3.8rem, 8vw, 6.5rem); }
.section-heading { max-width: 42rem; margin-bottom: 2.2rem; }
.section-heading h2 { margin-top: 0; }
.section-heading > p:last-child { color: var(--slate-600); font-size: 1.05rem; }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.1rem; }
.resource-card { position: relative; min-height: 21rem; display: flex; flex-direction: column; padding: 1.55rem; border: 1px solid var(--slate-200); border-radius: var(--radius); background: var(--white); box-shadow: var(--shadow-sm); }
.resource-card:hover { border-color: #99f6e4; box-shadow: 0 15px 36px rgb(15 118 110 / 0.09); transform: translateY(-2px); transition: 160ms ease; }
.featured-card { background: var(--slate-900); border-color: var(--slate-900); color: var(--slate-200); }
.featured-card h3 { color: var(--white); }
.featured-card .card-kicker, .featured-card .card-number { color: var(--teal-100); }
.featured-card a { color: #99f6e4; }
.card-number { color: var(--slate-300); font-family: var(--font-mono); font-size: 0.8rem; }
.card-kicker { margin: 2.7rem 0 0; color: var(--teal-700); font-size: 0.76rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; }
.resource-card h3 { margin-top: 0.55rem; }
.resource-card p:not(.card-kicker) { color: inherit; opacity: 0.84; }
.resource-card a { margin-top: auto; font-weight: 750; }
.method-band { background: var(--slate-100); border-block: 1px solid var(--slate-200); }
.split-section { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 8vw, 7rem); align-items: start; }
.split-section h2 { margin-top: 0; }
.split-section > div:last-child { color: var(--slate-700); font-size: 1.06rem; }
.text-link { display: inline-block; margin-top: 0.6rem; font-weight: 750; }

.page-shell { padding-block: clamp(3rem, 7vw, 6rem); }
.page-heading { padding-bottom: 2rem; border-bottom: 1px solid var(--slate-200); margin-bottom: 2.3rem; }
.page-heading h1 { max-width: none; font-size: clamp(2.1rem, 5vw, 3.65rem); }
.lede { max-width: 44rem; margin-bottom: 0; color: var(--slate-700); font-size: 1.15rem; }
.page-meta { display: flex; flex-wrap: wrap; gap: 0.45rem 1.2rem; margin-top: 1.2rem; color: var(--slate-600); font-size: 0.83rem; }
.prose { color: var(--slate-800); }
.prose h2 { margin-top: 3rem; font-size: clamp(1.55rem, 3vw, 2.1rem); }
.prose h3 { margin-top: 2.2rem; }
.prose p, .prose li { max-width: 72ch; }
.prose li + li { margin-top: 0.45rem; }
.prose code { padding: 0.12rem 0.3rem; border-radius: 0.25rem; background: var(--slate-100); font-family: var(--font-mono); font-size: 0.9em; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.prose th, .prose td { padding: 0.8rem; border: 1px solid var(--slate-300); text-align: left; vertical-align: top; }
.prose thead th { background: var(--slate-900); color: var(--white); }
.prose tbody th { background: var(--slate-100); }
.table-scroll { max-width: calc(100vw - 2rem); overflow-x: auto; margin-block: 1.3rem; }
.revision-note, .notice { margin-block: 2rem; padding: 1rem 1.1rem; border-left: 4px solid var(--teal-600); background: var(--teal-50); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.revision-note p, .notice p { margin-bottom: 0; }
.notice-warning { border-color: #d97706; background: var(--amber-100); color: var(--amber-800); }
.formula-block { display: grid; gap: 0.7rem; padding: 1.2rem; margin-block: 1.4rem; border: 1px solid var(--slate-300); border-radius: var(--radius); background: var(--slate-900); color: var(--white); overflow-x: auto; }
.formula-block code { background: transparent; color: inherit; }

.calculator-shell { margin-block: 1.5rem 3rem; }
.calculator-form { padding: clamp(1rem, 4vw, 2rem); border: 1px solid var(--slate-200); border-radius: var(--radius-lg); background: var(--slate-50); }
.form-intro h2 { margin-top: 0; font-size: 1.55rem; }
.form-intro p { color: var(--slate-600); }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.15rem; margin-top: 1.5rem; }
.field { display: flex; flex-direction: column; }
.field label { margin-bottom: 0.35rem; color: var(--slate-900); font-size: 0.9rem; font-weight: 750; }
.field input { width: 100%; padding: 0.72rem 0.8rem; border: 1px solid var(--slate-300); border-radius: 0.55rem; background: var(--white); color: var(--ink); }
.field input:hover { border-color: var(--slate-500); }
.field input[aria-invalid="true"] { border-color: var(--red-700); background: var(--red-50); }
.field small { margin-top: 0.32rem; color: var(--slate-600); font-size: 0.78rem; }
.field-error { min-height: 1.25rem; color: var(--red-700); font-size: 0.78rem; font-weight: 650; }
.form-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.1rem; }
.form-summary { margin-top: 0.8rem; color: var(--red-700); font-weight: 700; }
.calculator-results { scroll-margin-top: 7rem; margin-top: 1.4rem; padding: clamp(1.2rem, 4vw, 2rem); border-radius: var(--radius-lg); background: var(--slate-900); color: var(--slate-100); box-shadow: var(--shadow-md); }
.calculator-results[hidden] { display: none; }
.results-header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 1rem; }
.results-header h2 { margin: 0; color: var(--white); }
.status-pill { display: inline-flex; padding: 0.35rem 0.7rem; border-radius: 999px; font-size: 0.78rem; font-weight: 800; }
.status-review { background: var(--amber-100); color: var(--amber-800); }
.status-hold { background: var(--teal-100); color: var(--teal-800); }
.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-block: 1.5rem; background: var(--slate-700); border: 1px solid var(--slate-700); border-radius: var(--radius); overflow: hidden; }
.result-grid > div { padding: 1rem; background: var(--slate-800); }
.result-grid dt { color: var(--slate-300); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; }
.result-grid dd { margin: 0.25rem 0 0; color: var(--white); font-size: 1.2rem; font-weight: 800; }
.result-explanation { font-size: 1.05rem; }
.calculator-results .notice { background: rgb(204 251 241 / 0.08); color: var(--slate-100); }

.worksheet-meta { display: grid; grid-template-columns: max-content 1fr; gap: 0.8rem 1rem; margin-block: 1.3rem; }
.worksheet-meta span:nth-child(even) { min-height: 1.6rem; border-bottom: 1px solid var(--slate-500); }
.worksheet-table td { min-width: 7rem; height: 2.8rem; }
.person-card { padding: 1.3rem; margin-block: 1rem; border: 1px solid var(--slate-200); border-radius: var(--radius); }
.person-card h2 { margin-top: 0; }
.not-found { padding-block: 8rem; text-align: center; }
.not-found h1 { max-width: none; }
.not-found .button-row { justify-content: center; }

.site-footer { padding-block: 3.5rem 1.5rem; background: var(--slate-900); color: var(--slate-300); }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.footer-title { margin: 0; color: var(--white); font-size: 1.05rem; font-weight: 800; }
.footer-grid nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem 1.5rem; }
.footer-grid a { color: var(--slate-200); text-decoration: none; }
.footer-grid a:hover { color: var(--teal-100); }
.footer-base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.6rem 1rem; margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--slate-700); color: var(--slate-500); font-size: 0.78rem; }

@media (max-width: 850px) {
  .nav-toggle { display: inline-flex; }
  .site-nav { display: none; position: absolute; top: calc(100% + 1px); left: 0; right: 0; padding: 1rem; background: var(--white); border-bottom: 1px solid var(--slate-200); box-shadow: var(--shadow-md); }
  .site-nav.is-open { display: grid; }
  .site-nav a { padding: 0.55rem 0.5rem; }
  .hero-grid, .split-section { grid-template-columns: 1fr; }
  .hero-grid { gap: 2.6rem; }
  .hero-panel { max-width: 34rem; }
  .card-grid { grid-template-columns: 1fr; }
  .resource-card { min-height: 17rem; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .shell { width: min(calc(100% - 1.25rem), var(--shell)); }
  .brand small { display: none; }
  .header-inner { min-height: 4.4rem; }
  h1 { font-size: clamp(2.25rem, 13vw, 3.3rem); }
  .button-row .button { width: 100%; }
  .trust-list { display: grid; gap: 0.55rem; }
  .form-grid, .result-grid { grid-template-columns: 1fr; }
  .result-grid { gap: 0; }
  .footer-grid nav { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

@media print {
  .site-header, .site-footer, .review-banner, .no-print, .page-meta { display: none !important; }
  body { color: #000; font-size: 10pt; }
  .page-shell { max-width: none; padding: 0; }
  .page-heading { margin-bottom: 1rem; }
  .worksheet-table { font-size: 7.5pt; }
  .worksheet-table th, .worksheet-table td { padding: 0.3rem; }
  a { color: #000; text-decoration: none; }
}