:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-soft: #f8faff;
  --text: #172033;
  --muted: #5f6b7d;
  --line: #dce3ef;
  --blue: #185adb;
  --blue-dark: #1047b6;
  --blue-soft: #eaf1ff;
  --coral: #e76068;
  --coral-soft: #fff0f1;
  --green: #157f64;
  --shadow: 0 18px 50px rgba(27, 45, 82, .09);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 11px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at 50% 0, #fff 0, var(--bg) 560px); line-height: 1.55; }
button, select { font: inherit; }
a { color: var(--blue); }
img, svg { display: block; max-width: 100%; }
.shell { width: min(1180px, calc(100% - 32px)); margin-inline: auto; }
.skip-link { position: fixed; left: 12px; top: -60px; z-index: 100; padding: 10px 14px; border-radius: 8px; background: var(--text); color: #fff; }
.skip-link:focus { top: 12px; }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid rgba(220, 227, 239, .85); background: rgba(255, 255, 255, .9); backdrop-filter: blur(18px); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 11px; color: var(--text); text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
.header-actions { display: flex; align-items: center; gap: 22px; }
.header-actions > a:not(.github-button) { color: var(--muted); text-decoration: none; font-weight: 650; font-size: .94rem; }
.header-actions > a:hover { color: var(--blue); }
.github-button { display: inline-flex; align-items: center; gap: 8px; min-height: 42px; padding: 0 15px; border: 1px solid var(--line); border-radius: 12px; color: var(--text); text-decoration: none; background: var(--surface); font-weight: 750; }
.github-button svg { width: 20px; }

.hero { padding: 76px 0 48px; text-align: center; }
.eyebrow, .kicker { color: var(--blue); text-transform: uppercase; letter-spacing: .12em; font-size: .75rem; font-weight: 850; }
.hero h1 { margin: 8px 0 10px; font-size: clamp(2.45rem, 6vw, 4.5rem); line-height: 1.02; letter-spacing: -.055em; }
.hero-copy { max-width: 790px; margin: 0 auto; color: var(--muted); font-size: clamp(1.02rem, 2vw, 1.22rem); }
.benefits { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.benefits span { padding: 9px 13px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.78); color: #3f4a5d; font-weight: 650; font-size: .9rem; }

.calculator, .results, .content-card, .sources { border: 1px solid var(--line); border-radius: var(--radius-lg); background: rgba(255,255,255,.94); box-shadow: var(--shadow); }
.calculator { padding: clamp(20px, 4vw, 38px); }
.section-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.section-heading h2, .content-card h2, .sources h2 { margin: 4px 0 6px; line-height: 1.15; letter-spacing: -.025em; }
.section-heading p, .content-card p, .sources p { margin: 0; color: var(--muted); }
.text-button { border: 0; background: transparent; color: var(--blue); cursor: pointer; font-weight: 750; padding: 8px; }

.parent-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.parent-card { min-width: 0; margin: 0; padding: 0; border: 1px solid var(--line); border-radius: 20px; background: var(--surface-soft); overflow: hidden; }
.parent-card legend { float: left; width: 100%; padding: 18px 20px 14px; border-bottom: 1px solid var(--line); font-weight: 850; font-size: 1.1rem; }
.parent-card legend + * { clear: both; }
.parent-card--sire legend { color: var(--blue); }
.parent-card--dam legend { color: var(--coral); }
.parent-card-body { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 18px; padding: 20px; }
.parent-preview { align-self: start; position: sticky; top: 98px; min-height: 220px; display: grid; place-items: center; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); }
.parent-preview small { display: block; padding: 0 12px 14px; color: var(--muted); text-align: center; font-weight: 700; }
.controls-grid { display: grid; gap: 12px; }
.controls-grid label { display: grid; gap: 5px; color: #3c4657; font-size: .82rem; font-weight: 750; }
select { width: 100%; min-height: 44px; border: 1px solid #cfd8e8; border-radius: 10px; padding: 0 36px 0 12px; color: var(--text); background: var(--surface); }
select:focus, button:focus-visible, a:focus-visible { outline: 3px solid rgba(24,90,219,.24); outline-offset: 2px; }

.calculate-row { display: flex; align-items: center; justify-content: center; gap: 18px; margin-top: 24px; }
.primary-button, .secondary-button { border: 0; border-radius: 12px; cursor: pointer; font-weight: 800; }
.primary-button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 52px; padding: 0 26px; color: #fff; background: linear-gradient(135deg, var(--blue), #2777f4); box-shadow: 0 10px 24px rgba(24,90,219,.25); }
.primary-button:hover { background: linear-gradient(135deg, var(--blue-dark), var(--blue)); }
.primary-button svg { width: 21px; }
.calculation-note { color: var(--muted); font-size: .88rem; }

.results { margin-top: 28px; padding: clamp(20px, 4vw, 38px); }
.results-heading { align-items: center; }
.result-actions { display: flex; gap: 10px; }
.secondary-button { min-height: 42px; padding: 0 14px; color: var(--text); background: var(--surface-soft); border: 1px solid var(--line); }
.secondary-button:hover { border-color: #b7c5db; background: var(--blue-soft); }
.sex-results-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.sex-panel { border: 1px solid var(--line); border-radius: 18px; overflow: hidden; background: var(--surface-soft); }
.sex-panel > header { display: flex; align-items: center; gap: 12px; padding: 17px 18px; border-bottom: 1px solid var(--line); }
.sex-panel > header > span { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; font-size: 1.28rem; font-weight: 900; }
.sex-panel--male > header > span { color: var(--blue); background: var(--blue-soft); }
.sex-panel--female > header > span { color: var(--coral); background: var(--coral-soft); }
.sex-panel h3 { margin: 0; font-size: 1rem; }
.sex-panel header p { margin: 1px 0 0; color: var(--muted); font-size: .8rem; }
.outcome-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; padding: 12px; }
.outcome-card { position: relative; min-width: 0; padding: 12px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.outcome-visual { width: 108px; max-width: 58%; margin: 0 auto 4px; }
.probability-badge { position: absolute; top: 10px; right: 10px; padding: 5px 8px; border-radius: 999px; background: var(--blue-soft); color: var(--blue); font-size: .76rem; font-weight: 900; }
.sex-panel--female .probability-badge { color: #c53f49; background: var(--coral-soft); }
.outcome-card h4 { margin: 3px 0 6px; font-size: .91rem; line-height: 1.25; }
.outcome-meta { display: flex; flex-wrap: wrap; gap: 5px; }
.outcome-meta span { padding: 3px 6px; border-radius: 6px; background: #eef2f7; color: #526074; font-size: .68rem; font-weight: 700; }
.outcome-card details { margin-top: 8px; color: var(--muted); font-size: .72rem; }
.outcome-card summary { cursor: pointer; color: var(--blue); font-weight: 750; }
.empty-result { grid-column: 1 / -1; padding: 36px 18px; color: var(--muted); text-align: center; }

.carrier-panel { display: grid; grid-template-columns: .8fr 1.2fr; gap: 24px; margin-top: 18px; padding: 22px; border-radius: 18px; background: #f4fbf8; border: 1px solid #cfe9df; }
.carrier-panel h3 { margin: 4px 0 6px; }
.carrier-panel p { margin: 0; color: var(--muted); }
.carrier-grid { align-content: start; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.carrier-item { display: flex; align-items: center; justify-content: space-between; gap: 10px; min-height: 46px; padding: 10px 12px; border-radius: 10px; background: var(--surface); border: 1px solid #d6ebe4; }
.carrier-item span:first-child { font-size: .82rem; font-weight: 700; }
.carrier-item strong { color: var(--green); }

.content-section { margin-top: 28px; }
.content-card { padding: clamp(22px, 4vw, 36px); }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 26px; }
.steps-grid span { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--blue-soft); color: var(--blue); font-weight: 900; }
.steps-grid h3 { margin: 12px 0 5px; font-size: 1rem; }
.steps-grid p { font-size: .91rem; }
.scope-note { margin-top: 26px; padding: 16px 18px; border-radius: 12px; background: var(--surface-soft); color: var(--muted); }
.two-column-content { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.sources { margin-top: 28px; padding: clamp(22px, 4vw, 36px); }
.sources ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 28px; margin: 22px 0 0; padding-left: 20px; }
.sources li { color: var(--muted); }
.sources a { text-underline-offset: 3px; }
.review-date { margin-top: 18px !important; font-size: .82rem; }
footer { padding: 36px 16px; color: var(--muted); text-align: center; font-size: .88rem; }

.cat-preview-svg { width: 100%; max-width: 190px; height: auto; }
.cat-preview-svg--compact { max-width: 108px; }

@media (max-width: 980px) {
  .parent-card-body { grid-template-columns: 130px minmax(0,1fr); }
  .parent-preview { min-height: 180px; }
  .outcome-grid { grid-template-columns: 1fr; }
  .carrier-panel { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .shell { width: min(100% - 22px, 1180px); }
  .site-header { position: static; }
  .header-inner { min-height: 64px; }
  .brand span { font-size: .92rem; }
  .header-actions > a:not(.github-button) { display: none; }
  .github-button { padding-inline: 12px; }
  .github-button span { display: none; }
  .hero { padding: 48px 0 32px; }
  .parent-grid, .sex-results-grid, .two-column-content, .steps-grid { grid-template-columns: 1fr; }
  .parent-card-body { grid-template-columns: 1fr; }
  .parent-preview { position: static; min-height: 160px; }
  .cat-preview-svg { max-width: 150px; }
  .controls-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .calculate-row { flex-direction: column; text-align: center; }
  .primary-button { width: 100%; }
  .section-heading, .results-heading { align-items: stretch; flex-direction: column; }
  .result-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .sources ul { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .controls-grid { grid-template-columns: 1fr; }
  .calculator, .results, .content-card, .sources { border-radius: 18px; }
  .calculator, .results { padding: 16px; }
  .parent-card-body { padding: 14px; }
  .outcome-grid { grid-template-columns: repeat(2, minmax(0,1fr)); padding: 9px; gap: 8px; }
  .outcome-card { padding: 9px; }
  .outcome-visual { max-width: 75%; }
  .result-actions { grid-template-columns: 1fr; }
  .carrier-grid { grid-template-columns: 1fr; }
}

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

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1421;
    --surface: #141d2d;
    --surface-soft: #111a29;
    --text: #edf2fb;
    --muted: #a9b4c7;
    --line: #2a3850;
    --blue-soft: #172c55;
    --coral-soft: #40232b;
    --shadow: 0 18px 50px rgba(0,0,0,.24);
  }
  body { background: radial-gradient(circle at 50% 0, #17233a 0, var(--bg) 560px); }
  .site-header { background: rgba(13,20,33,.9); }
  select { color-scheme: dark; }
  .benefits span, .calculator, .results, .content-card, .sources { background: rgba(20,29,45,.95); }
  .outcome-meta span { background: #202c3e; color: #c2ccdc; }
  .carrier-panel { background: #10251f; border-color: #244b40; }
  .carrier-item { border-color: #2b5147; }
}