/* ============================================================
   Pediatric Dose Calculator
   Built on the PedCalc instrument aesthetic:
   Instrument Serif (display) / IBM Plex Sans (UI) / IBM Plex Mono (numbers)
   Light follows the OS by default; the toggle stamps data-theme.
   ============================================================ */

:root {
  --bg:        #0a0d11;
  --bg-deep:   #06080b;
  --panel:     #111720;
  --panel-2:   #161e29;
  --inset:     #0b1016;
  --line:      #202b39;
  --line-soft: #18212c;
  --text:      #e6edf5;
  --text-2:    #9aabbf;
  --text-3:    #6f8298;
  --signal:    #ffc15e;
  --signal-dim:#f2a93b;
  --signal-glow: rgba(255, 193, 94, 0.14);
  --teal:      #5ed6c4;
  --alert:     #ff7a6e;
  --alert-bg:  rgba(255, 107, 94, 0.12);
  --doctor:    #ffc15e;
  --doctor-bg: rgba(255, 193, 94, 0.10);
  --ok-bg:     rgba(94, 214, 196, 0.10);

  --radius: 4px;
  --radius-lg: 7px;
  --font-display: "Instrument Serif", Georgia, "Times New Roman", serif;
  --font-ui: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --wrap: 1120px;
}

:root[data-theme="light"] {
  --bg: #f4f1ea; --bg-deep: #ebe7dd; --panel: #fffefb; --panel-2: #faf7f0; --inset: #f7f4ec;
  --line: #ddd6c7; --line-soft: #e8e2d6;
  --text: #16202b; --text-2: #4f5d69; --text-3: #7a848c;
  --signal: #9a5c0e; --signal-dim: #7f4b0b; --signal-glow: rgba(168, 102, 18, 0.10);
  --teal: #0f7a6c; --alert: #b3281c; --alert-bg: rgba(192, 47, 34, 0.08);
  --doctor: #8a5208; --doctor-bg: rgba(168, 102, 18, 0.09); --ok-bg: rgba(15, 122, 108, 0.08);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f1ea; --bg-deep: #ebe7dd; --panel: #fffefb; --panel-2: #faf7f0; --inset: #f7f4ec;
    --line: #ddd6c7; --line-soft: #e8e2d6;
    --text: #16202b; --text-2: #4f5d69; --text-3: #7a848c;
    --signal: #9a5c0e; --signal-dim: #7f4b0b; --signal-glow: rgba(168, 102, 18, 0.10);
    --teal: #0f7a6c; --alert: #b3281c; --alert-bg: rgba(192, 47, 34, 0.08);
    --doctor: #8a5208; --doctor-bg: rgba(168, 102, 18, 0.09); --ok-bg: rgba(15, 122, 108, 0.08);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 400 16px/1.6 var(--font-ui); -webkit-font-smoothing: antialiased;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
img, svg { max-width: 100%; }
a { color: var(--teal); text-underline-offset: 2px; }
a:hover { color: var(--signal); }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }
h1, h2, h3 { text-wrap: balance; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--panel); padding: 8px 12px; z-index: 200; }
.skip:focus { left: 8px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: 16px; }
@media (min-width: 700px) { .wrap { padding-inline: 24px; } }

/* ----------------------------------------------------------- chrome */

.draft-banner {
  background: var(--alert-bg); color: var(--text); border-bottom: 1px solid var(--alert);
  padding: 9px 16px; font-size: 14px; text-align: center;
}
.draft-banner strong { color: var(--alert); }

.site-head {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg-deep) 90%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top, 0px);
}
.head-inner { display: flex; align-items: center; gap: 14px 22px; flex-wrap: wrap; padding-block: 10px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-mark {
  width: 32px; height: 32px; border: 1px solid var(--signal); border-radius: 50%;
  display: grid; place-items: center; color: var(--signal);
  font: 600 11px/1 var(--font-mono); letter-spacing: -0.3px;
  box-shadow: 0 0 14px var(--signal-glow), inset 0 0 10px var(--signal-glow);
}
.brand-name { font: 400 21px/1 var(--font-display); white-space: nowrap; }
.brand-name em { color: var(--signal); font-style: normal; }
.site-nav { display: flex; gap: 4px 18px; flex-wrap: wrap; margin-left: auto; font-size: 14.5px; }
.site-nav a { color: var(--text-2); text-decoration: none; padding: 4px 0; border-bottom: 1px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current] { color: var(--text); border-bottom-color: var(--signal); }
.theme-btn {
  background: transparent; border: 1px solid var(--line); color: var(--text-2);
  font: 500 11px/1 var(--font-ui); text-transform: uppercase; letter-spacing: 0.1em;
  padding: 8px 10px; border-radius: var(--radius); cursor: pointer;
}
.theme-btn:hover { border-color: var(--signal); color: var(--signal); }
@media (max-width: 640px) {
  .site-nav { order: 3; width: 100%; margin-left: 0; }
  .theme-btn { margin-left: auto; }
}

.main { padding-block: 22px 72px; }

.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 4px; padding: 0; margin: 0 0 18px; font-size: 13px; color: var(--text-3); }
.crumbs li:not(:last-child)::after { content: "/"; margin-left: 6px; color: var(--line); }
.crumbs a { color: var(--text-2); text-decoration: none; }
.crumbs a:hover { color: var(--signal); }

/* ----------------------------------------------------------- headings */

.hero, .page-head { margin-bottom: 20px; max-width: 760px; }
.eyebrow {
  font: 500 11px/1.4 var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--signal); margin: 0 0 10px;
}
h1 { font: 400 clamp(34px, 6vw, 54px)/1.03 var(--font-display); letter-spacing: -0.01em; margin: 0 0 12px; }
.lede { color: var(--text-2); font-size: 17px; max-width: 62ch; margin: 0; }
.aka { color: var(--text-3); font-size: 14px; margin: 0; }
h2 { font: 400 clamp(26px, 3.6vw, 32px)/1.15 var(--font-display); margin: 0 0 12px; }
h3 { font: 600 16px/1.35 var(--font-ui); margin: 20px 0 8px; }

/* ----------------------------------------------------------- answer */

.answer {
  border-left: 3px solid var(--signal); background: var(--panel);
  padding: 16px 20px; margin: 0 0 26px; max-width: 780px; border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}
.answer p { margin: 0; font-size: 17px; line-height: 1.6; }
.answer .answer-src { margin-top: 10px; font-size: 13px; color: var(--text-3); }

/* ----------------------------------------------------------- calculator */

.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 20px; }
.calc { margin-bottom: 34px; }
.calc-head h2 { font-size: 26px; margin-bottom: 16px; }
.work { display: grid; gap: 20px; }
@media (min-width: 860px) { .work { grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 28px; } }

.field { margin-bottom: 16px; }
.field > label { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: 0.11em; color: var(--text-2); font-weight: 500; margin-bottom: 6px; }
.input-row { display: flex; gap: 8px; align-items: center; }
.input {
  width: 100%; min-height: 46px; background: var(--inset); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius);
  font: 500 17px/1.2 var(--font-mono); padding: 10px 12px;
  transition: border-color 0.18s, box-shadow 0.18s;
}
select.input { font: 400 16px/1.2 var(--font-ui); cursor: pointer; }
.input:focus { outline: none; border-color: var(--signal); box-shadow: 0 0 0 3px var(--signal-glow); }
.input.unit { width: auto; flex: 0 0 auto; min-width: 88px; }
.input::placeholder { color: var(--text-3); font-weight: 400; }
.unit-static { font: 500 13px var(--font-mono); color: var(--text-3); white-space: nowrap; }
.hint { font-size: 13px; color: var(--text-3); margin: 6px 0 0; }
.calc-foot { font-size: 14px; color: var(--text-2); margin: 18px 0 0; border-top: 1px solid var(--line-soft); padding-top: 14px; }

.readout { min-width: 0; }
.empty {
  border: 1px dashed var(--line); border-radius: var(--radius-lg); padding: 22px;
  color: var(--text-3); font-size: 14.5px; min-height: 140px; display: flex; flex-direction: column; justify-content: center; gap: 4px;
}
.empty strong { color: var(--text-2); font-weight: 500; }

.result { background: var(--inset); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 18px 20px; }
.result + .result { margin-top: 12px; }
.result-label { font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-3); margin-bottom: 6px; }
.result-value { font: 500 clamp(34px, 7vw, 46px)/1.05 var(--font-mono); color: var(--signal); letter-spacing: -0.02em; }
.result-value .unit { font-size: 0.45em; color: var(--text-2); margin-left: 6px; letter-spacing: 0; }
.result-sub { color: var(--text-2); font-size: 14.5px; margin-top: 6px; }
.working { font: 400 13px/1.6 var(--font-mono); color: var(--text-3); margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--line); white-space: pre-line; }
.working b { color: var(--text-2); font-weight: 500; }

.facts { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 6px; font-size: 14.5px; }
.facts li { display: flex; gap: 8px; }
.facts li::before { content: "\2192"; color: var(--signal); font-family: var(--font-mono); }

.other-products { margin-top: 12px; font-size: 14px; }
.other-products table { min-width: 0; }
.other-products tbody th { white-space: normal; }

.flag { border-radius: var(--radius-lg); padding: 14px 16px; font-size: 15px; margin-top: 12px; border: 1px solid; }
.flag.stop { background: var(--alert-bg); border-color: var(--alert); }
.flag.stop strong { color: var(--alert); }
.flag.doctor { background: var(--doctor-bg); border-color: var(--doctor); }
.flag.doctor strong { color: var(--doctor); }
.flag.info { background: var(--ok-bg); border-color: color-mix(in srgb, var(--teal) 50%, transparent); }
.flag a { color: inherit; }

.more-link { display: inline-block; margin-top: 12px; font-size: 14.5px; }

/* ----------------------------------------------------------- tables */

.chart, .prose, .faq, .sources, .related, .group, .principles, .subpages { margin-block: 34px; }
.chart-meta { color: var(--text-2); margin: 0 0 12px; max-width: 70ch; }
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--panel); -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 560px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
thead th { font: 500 11.5px/1.35 var(--font-ui); text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-2); background: var(--panel-2); }
tbody th { font-weight: 500; white-space: nowrap; }
tbody tr:last-child > * { border-bottom: 0; }
tbody tr:hover { background: var(--panel-2); }
td.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.sub { display: block; font-size: 12px; color: var(--text-3); font-family: var(--font-ui); font-weight: 400; text-transform: none; letter-spacing: 0; }
.na { color: var(--text-3); }
.table-src { font-size: 13px; color: var(--text-3); margin: 10px 0 0; }
.gates { list-style: none; padding: 0; margin: 14px 0 0; display: grid; gap: 8px; max-width: 780px; }
.gate { padding: 10px 14px; border-radius: var(--radius); font-size: 14.5px; border-left: 3px solid; }
.gate.stop { background: var(--alert-bg); border-color: var(--alert); }
.gate.doctor { background: var(--doctor-bg); border-color: var(--doctor); }
.gate-inline.stop { color: var(--alert); font-family: var(--font-ui); font-weight: 500; }
tr.now { background: var(--signal-glow); }

/* ----------------------------------------------------------- prose */

.prose { max-width: 720px; }
.prose p, .prose li { color: var(--text); }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.faq details { border-bottom: 1px solid var(--line); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 500; font-size: 16.5px; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--font-mono); color: var(--signal); }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { margin: 8px 0 0; color: var(--text-2); }

.sources ol { padding-left: 22px; font-size: 14px; color: var(--text-2); max-width: 820px; }
.sources li { margin-bottom: 8px; }
.sources li:target { background: var(--signal-glow); }

.review { border-radius: var(--radius-lg); padding: 14px 18px; margin-block: 28px; max-width: 780px; font-size: 14.5px; }
.review p { margin: 0; }
.review.pending { background: var(--doctor-bg); border: 1px solid var(--doctor); }
.review.ok { background: var(--ok-bg); border: 1px solid var(--teal); }

.app-bridge {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 16px 20px; margin-block: 30px; max-width: 780px;
}
.app-bridge div { flex: 1 1 280px; font-size: 15px; }
.btn {
  display: inline-block; background: var(--signal); color: var(--bg-deep); text-decoration: none;
  font: 600 14px/1 var(--font-ui); padding: 12px 18px; border-radius: var(--radius); white-space: nowrap;
}
.btn:hover { background: var(--signal-dim); color: var(--bg-deep); }

/* ----------------------------------------------------------- cards */

.card-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.card-list.wide { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.mini-card {
  display: flex; flex-direction: column; gap: 3px; height: 100%;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 14px 16px; text-decoration: none; color: var(--text); transition: border-color 0.18s, transform 0.18s var(--ease);
}
.mini-card:hover { border-color: var(--signal); color: var(--text); }
.mc-name { font: 400 22px/1.15 var(--font-display); }
.mc-generic { font: 400 12.5px var(--font-mono); color: var(--signal); }
.mc-use { font-size: 14px; color: var(--text-2); }
.group-h { color: var(--text-2); font-size: 13px; text-transform: uppercase; letter-spacing: 0.1em; margin: 22px 0 10px; }

.principle-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.principle { border-top: 2px solid var(--signal); padding-top: 12px; }
.principle h3 { margin-top: 0; font-family: var(--font-display); font-weight: 400; font-size: 23px; }
.principle p { margin: 0; color: var(--text-2); font-size: 15px; }

.subpages ul { padding-left: 20px; }

/* ----------------------------------------------------------- footer */

.site-foot { border-top: 1px solid var(--line); background: var(--bg-deep); padding-block: 36px 48px; font-size: 14px; }
.foot-grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.foot-h { font: 500 11.5px/1 var(--font-ui); text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-3); margin: 0 0 10px; }
.site-foot ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.site-foot a { color: var(--text-2); text-decoration: none; }
.site-foot a:hover { color: var(--signal); }
.foot-note { grid-column: 1 / -1; color: var(--text-3); border-top: 1px solid var(--line-soft); padding-top: 18px; }
.foot-note p { margin: 0 0 8px; max-width: 90ch; }
.foot-note strong { color: var(--text-2); }

@media print {
  .site-head, .site-foot, .calc, .app-bridge, .draft-banner, .theme-btn, .crumbs { display: none !important; }
  body { background: #fff; color: #000; }
  .table-scroll { border: 0; overflow: visible; }
  table { min-width: 0; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* ----------------------------------------------------------- clinical + quiz */

.audience-note { display: inline-block; margin: 6px 0 0; font-size: 13.5px; color: var(--text-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 5px 10px; }
.quiz-q { font-size: 17px; line-height: 1.5; margin: 0 0 16px; padding: 14px 16px; background: var(--inset); border: 1px solid var(--line); border-radius: var(--radius-lg); }
.quiz-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 8px; }
.quiz-actions .btn { border: 0; cursor: pointer; }
.btn.ghost { background: transparent; color: var(--text); box-shadow: inset 0 0 0 1px var(--line); }
.btn.ghost:hover { box-shadow: inset 0 0 0 1px var(--signal); color: var(--signal); background: transparent; }
.facts.steps { list-style: decimal; padding-left: 22px; }
.facts.steps li { display: list-item; }
.facts.steps li::before { content: none; }
.calc-head .hint { margin-top: -8px; margin-bottom: 14px; }
.prose details { border-bottom: 1px solid var(--line); padding: 10px 0; }
.prose details summary { cursor: pointer; font-weight: 500; }