/* Billi Pilla — original styles. System fonts only, no external resources. */
:root {
  --ink: #1d2a33;
  --ink-soft: #44525c;
  --paper: #fffaf3;
  --card: #ffffff;
  --leaf: #1f6b5c;
  --leaf-dark: #154d42;
  --mist: #e7f1ee;
  --marigold: #f2a93b;
  --marigold-soft: #fdeccc;
  --clay: #a54a24;
  --clay-soft: #f8e3d9;
  --line: #e3d9cc;
  --urgent: #9f2a1b;
  --urgent-soft: #fdecea;
  --radius: 14px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --step-0: 1rem;
  --step-1: 1.15rem;
  --step-2: 1.35rem;
  --step-3: 1.7rem;
  --step-4: 2.1rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--step-0);
  line-height: 1.6;
  overflow-wrap: break-word;
}
img, svg { max-width: 100%; }
a { color: var(--leaf-dark); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: #fff; padding: 10px 14px; z-index: 10; }
.skip:focus { left: 8px; top: 8px; color: #fff; }

.wrap { width: 100%; max-width: 980px; margin: 0 auto; padding: 0 16px; }
main.wrap { padding-top: 12px; padding-bottom: 40px; }

h1, h2, h3, h4 { line-height: 1.25; margin: 1.4em 0 0.5em; letter-spacing: -0.01em; }
h1 { font-size: var(--step-3); margin-top: 0.6em; }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); }
h4 { font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-soft); margin: 1em 0 0.3em; }
p, ul, ol { margin: 0 0 1em; }
ul, ol { padding-left: 1.3em; }
li { margin-bottom: 0.3em; }
.lede { font-size: var(--step-1); color: var(--ink-soft); max-width: 46em; }
code { background: var(--mist); padding: 1px 5px; border-radius: 4px; font-size: 0.92em; }

/* Header */
.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px 16px; padding-top: 10px; padding-bottom: 8px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); min-height: 44px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-weight: 800; font-size: 1.25rem; letter-spacing: -0.02em; }
.brand-sub { font-size: 0.8rem; color: var(--ink-soft); }
.nav { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 2px 4px; }
.nav li { margin: 0; }
.nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 10px; border-radius: 999px; text-decoration: none; color: var(--ink); font-weight: 600; font-size: 0.95rem; }
.nav a:hover { background: var(--mist); }
.nav a[aria-current="page"] { background: var(--mist); color: var(--leaf-dark); box-shadow: inset 0 -3px 0 var(--marigold); }

/* Hero and chooser */
.hero { padding: 6px 0 4px; }
.eyebrow { margin: 0.6em 0 0; font-weight: 700; color: var(--clay); text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.82rem; }
.hero h1 { margin-top: 0.2em; }
.hero .lede { margin-bottom: 0.8em; }
.chooser { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 0 0 14px; }
.choice { display: flex; align-items: center; justify-content: center; min-height: 48px; padding: 8px 10px; border: 2px solid var(--leaf); border-radius: var(--radius); background: var(--card); color: var(--leaf-dark); font-weight: 700; text-decoration: none; text-align: center; }
.choice:hover { background: var(--mist); color: var(--leaf-dark); }
.choice[aria-current="true"] { background: var(--leaf); color: #fff; }

/* Checklist */
.checklist { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 14px 10px; margin: 0 0 12px; }
.cl-head h2 { margin: 0 0 4px; font-size: var(--step-2); }
.cl-progress { margin: 0 0 6px; font-weight: 600; color: var(--ink-soft); }
.bar { height: 10px; background: var(--marigold-soft); border-radius: 999px; overflow: hidden; margin-bottom: 6px; }
.bar span { display: block; height: 100%; width: 0; background: var(--leaf); transition: width 0.25s ease; }
.cl-sub { font-size: 1rem; margin: 1.1em 0 0.3em; color: var(--clay); text-transform: uppercase; letter-spacing: 0.05em; }
.cl-list { list-style: none; padding: 0; margin: 0; }
.cl-item { border-top: 1px solid var(--line); padding: 4px 0; margin: 0; }
.cl-row { display: flex; align-items: flex-start; gap: 10px; min-height: 44px; }
.cl-row input[type="checkbox"] { flex: none; width: 24px; height: 24px; margin: 10px 0 0; accent-color: var(--leaf); cursor: pointer; }
.cl-text { flex: 1; padding: 8px 0; cursor: pointer; }
.cl-item.done .cl-text { color: var(--ink-soft); text-decoration: line-through; text-decoration-color: var(--marigold); text-decoration-thickness: 2px; }
.cl-why, .cl-more, .cl-item .cite { margin: 0 0 6px 34px; }
.cl-why { color: var(--ink-soft); font-size: 0.95rem; }
.cl-more { font-size: 0.95rem; font-weight: 600; }
.cl-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 8px; }
.cl-storage { font-size: 0.88rem; color: var(--ink-soft); margin: 0 0 4px; }
.cl-detail-link { margin: -4px 0 20px; font-weight: 600; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 16px; border-radius: 999px; border: 2px solid var(--leaf); background: var(--card); color: var(--leaf-dark); font: inherit; font-weight: 700; cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--mist); color: var(--leaf-dark); }
.btn-primary { background: var(--leaf); color: #fff; }
.btn-primary:hover { background: var(--leaf-dark); color: #fff; }
.btn-quiet { border-color: var(--line); color: var(--ink-soft); }
.btn[aria-pressed="true"] { background: var(--leaf); color: #fff; }

/* Notes */
.note { border-radius: var(--radius); padding: 12px 14px; margin: 16px 0; border-left: 5px solid var(--leaf); background: var(--mist); }
.note p { margin: 0 0 0.5em; }
.note p:last-child { margin-bottom: 0; }
.note-limits { border-left-color: var(--marigold); background: var(--marigold-soft); }
.note-vet { border-left-color: var(--leaf); }
.note-urgent { border-left-color: var(--urgent); background: var(--urgent-soft); }
.note-disclosure { border-left-color: var(--clay); background: var(--clay-soft); }
.disclosure-inline { font-size: 0.9rem; color: var(--ink-soft); background: var(--clay-soft); border-radius: 10px; padding: 6px 10px; }
.cite { font-size: 0.85rem; color: var(--ink-soft); margin: 0.2em 0 1em; }
.cite a { color: var(--ink-soft); }
.tip { background: var(--card); border: 1px dashed var(--marigold); border-radius: var(--radius); padding: 10px 14px; }
.example { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; }

/* Guides grid */
.guide-grid { list-style: none; padding: 0; display: grid; grid-template-columns: 1fr; gap: 10px; }
.guide-grid li { margin: 0; }
.guide-card { display: flex; flex-direction: column; gap: 2px; height: 100%; padding: 14px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.guide-card:hover { border-color: var(--leaf); color: var(--ink); }
.guide-title { font-weight: 800; color: var(--leaf-dark); }
.guide-text { color: var(--ink-soft); font-size: 0.95rem; }

/* Products */
.filter-bar { position: relative; }
.filter { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 4px; }
.filter-status { font-size: 0.92rem; color: var(--ink-soft); }
.jump ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.jump li { margin: 0; }
.jump a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 12px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); text-decoration: none; font-weight: 600; font-size: 0.92rem; }
.product-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
.product { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; display: flex; flex-direction: column; scroll-margin-top: 12px; }
.product h3 { margin: 0 0 4px; }
.product ul { margin-bottom: 0.4em; }
.product .shop { margin-top: auto; }
.pets { margin: 0 0 6px; display: flex; gap: 6px; flex-wrap: wrap; }
.tag { display: inline-block; font-size: 0.78rem; font-weight: 700; padding: 2px 9px; border-radius: 999px; }
.tag-dog { background: var(--mist); color: var(--leaf-dark); }
.tag-cat { background: var(--clay-soft); color: var(--clay); }
.why { color: var(--ink-soft); }
.ticks li::marker { content: "\2713  "; color: var(--leaf); }
.crosses li::marker { content: "\2715  "; color: var(--clay); }
.safety { background: var(--marigold-soft); border-radius: 10px; padding: 8px 10px; margin: 8px 0 10px; font-size: 0.95rem; }
.safety p { margin: 0 0 0.3em; }
.safety .cite { margin-bottom: 0; }
.shop { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 44px; padding: 8px 14px; border-radius: 999px; background: var(--ink); color: #fff; font-weight: 700; text-decoration: none; margin-top: 8px; }
.shop:hover { background: var(--leaf-dark); color: #fff; }
.product[hidden] { display: none; }

/* Toxin cards and two-column blocks */
.toxin-list { list-style: none; padding: 0; display: grid; gap: 10px; }
.toxin { background: var(--card); border: 1px solid var(--line); border-left: 5px solid var(--clay); border-radius: var(--radius); padding: 10px 14px; margin: 0; }
.toxin h3 { margin: 0.2em 0 0.3em; }
.toxin .who { margin-bottom: 0.4em; }
.toxin .entry { margin-bottom: 0.2em; font-size: 0.92rem; }
.two-col, .qa-grid { display: grid; grid-template-columns: 1fr; gap: 10px; }
.col-card, .qa { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; }
.col-card h3, .qa h3 { margin-top: 0.3em; }
.urgent-list li { margin-bottom: 0.5em; }
.faq { border-top: 1px solid var(--line); padding-top: 4px; }
.faq h3 { margin-top: 0.8em; }
.link-list { padding-left: 1.2em; }
.link-list li { margin-bottom: 0.4em; }
.crumbs { margin: 10px 0 0; font-size: 0.92rem; color: var(--ink-soft); }
.other-lists { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-bottom: 12px; }
.other-lists ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.other-lists li { margin: 0; }
.other-lists a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--card); text-decoration: none; font-weight: 600; }
.data-table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 1em; table-layout: fixed; }
.data-table caption { text-align: left; font-weight: 700; padding: 6px 0; }
.data-table th, .data-table td { text-align: left; vertical-align: top; padding: 8px 10px; border-top: 1px solid var(--line); }
.data-table th:first-child, .data-table td:first-child { width: 40%; }
.data-table code { word-break: break-all; }
.clear-status { font-weight: 600; color: var(--leaf-dark); min-height: 1.6em; }
.sources { margin-top: 28px; border-top: 2px solid var(--line); padding-top: 6px; font-size: 0.92rem; }
.sources h2 { font-size: var(--step-1); }
.source-list li { margin-bottom: 0.6em; }
.method { margin-top: 24px; }

/* Footer */
.site-footer { background: var(--ink); color: #f3ede4; padding: 20px 0 28px; font-size: 0.92rem; }
.site-footer a { color: #fff; }
.site-footer :focus-visible { outline-color: #fff; }
.site-footer p { margin: 0.6em 0 0; }
.foot-links { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0 4px; }
.foot-links li { margin: 0; }
.foot-links a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 8px; }

@media (min-width: 640px) {
  :root { --step-3: 2rem; --step-4: 2.5rem; }
  .chooser { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .guide-grid, .product-grid, .two-col, .qa-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .checklist { padding: 18px 22px 12px; }
}
@media (min-width: 920px) {
  .guide-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .qa-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}
@media print {
  .site-header, .site-footer, .chooser, .cl-actions, .cl-storage, .skip, .guides, .other-lists, .faqs, .jump, .filter-bar, .shop, noscript { display: none !important; }
  body { background: #fff; }
  .pet-panel[hidden] { display: none !important; }
  .checklist { border: none; padding: 0; }
  .bar { display: none; }
  a { color: #000; }
}