:root {
  --bg: #EEF4F6;
  --bg-alt: #E4EDF0;
  --surface: #FFFFFF;
  --primary: #0F3D54;
  --primary-mid: #217491;
  --accent: #4FB6AC;
  --accent-strong: #2E9C90;
  --accent-bg: #E7F5F3;
  --caution: #C97A2B;
  --caution-bg: #FBF1E2;
  --warn: #A63446;
  --warn-bg: #FBEAEC;
  --text: #12242C;
  --text-muted: #5B7480;
  --border: #DCE7EA;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(15,61,84,.06), 0 8px 24px -12px rgba(15,61,84,.18);
  --font-ui: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

body {
  background:
    radial-gradient(1200px 600px at 100% -10%, rgba(33,116,145,.10), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(79,182,172,.12), transparent 55%),
    var(--bg);
  padding-bottom: env(safe-area-inset-bottom);
}

a { color: var(--primary-mid); }

/* Header */
.app-header {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 1rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark { flex: none; line-height: 0; filter: drop-shadow(0 4px 10px rgba(15,61,84,.25)); }

.brand-text h1 {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 1.35rem;
  margin: 0 0 2px;
  letter-spacing: -0.01em;
  color: var(--primary);
}

.eyebrow {
  margin: 0 0 2px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--accent-strong);
}

.lede {
  margin: 0.15rem 0 0;
  max-width: 62ch;
  color: var(--text-muted);
  line-height: 1.5;
  font-size: 0.88rem;
}

.layout {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.form-column {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

/* Each system is a card, like the ARUCIP siblings */
.system {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.15rem 1.2rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(15,61,84,.04);
}

.system h2 {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.98rem;
  margin: 0 0 0.7rem;
  color: var(--primary);
  letter-spacing: 0.01em;
}

.system-max {
  font-family: var(--font-ui);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

.variable {
  border: 0;
  padding: 0;
  margin: 0 0 0.65rem;
}

.variable:last-child { margin-bottom: 0; }

.variable legend {
  padding: 0;
  font-weight: 600;
  font-size: 0.86rem;
  margin-bottom: 0.3rem;
  color: var(--text);
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  padding: 0.32rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  line-height: 1.35;
  font-size: 0.86rem;
}

.option:hover {
  background: var(--bg-alt);
}

.option input {
  margin-top: 0.22rem;
  accent-color: var(--primary-mid);
  flex-shrink: 0;
}

.option:has(input:checked) {
  background: var(--accent-bg);
  box-shadow: inset 2px 0 0 var(--accent-strong);
}

.tam-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-bottom: 0.45rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.field select,
.field input {
  font: inherit;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  padding: 0.5rem 0.55rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-alt);
}

.field select:focus,
.field input:focus {
  border-color: var(--accent-strong);
  background: var(--surface);
}

.tam-hint {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.tam-hint[data-computed="true"] {
  color: var(--accent-strong);
  font-weight: 600;
}

.reset-btn {
  margin-top: 0.3rem;
  padding: 0.6rem 1rem;
  border: 1.5px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-md);
  font: inherit;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
}

.reset-btn:hover {
  border-color: var(--primary-mid);
  color: var(--primary-mid);
}

/* summary panel */
.summary-panel {
  position: sticky;
  bottom: 0;
  align-self: end;
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid rgba(15,61,84,.04);
}

.summary-inner {
  padding: 1.15rem 1.25rem 1.3rem;
}

.summary-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.summary-label {
  margin: 0;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-muted);
}

.summary-missing {
  margin: 0;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--warn);
}

.summary-missing[hidden] { display: none; }

.summary-total {
  font-family: var(--font-mono);
  font-size: 2.6rem;
  font-weight: 600;
  margin: 0.1rem 0 0.85rem;
  color: var(--primary);
  line-height: 1;
}

.summary-breakdown {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  margin-bottom: 0.9rem;
}

.summary-breakdown div {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.summary-breakdown strong {
  font-family: var(--font-mono);
  color: var(--text);
  font-weight: 600;
}

.summary-interpretation {
  margin: 0;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.9rem;
  text-align: center;
  background: var(--bg-alt);
  color: var(--text-muted);
}

.summary-interpretation[data-state="none"] {
  background: var(--accent-bg);
  color: var(--accent-strong);
}

.summary-interpretation[data-state="sepsis"] {
  background: var(--caution-bg);
  color: var(--caution);
}

.summary-interpretation[data-state="shock"] {
  background: var(--warn-bg);
  color: var(--warn);
}

.app-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
}

.app-footer p {
  margin: 0;
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: 65ch;
}

/* focus visibility */
input:focus-visible,
select:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 1fr 300px;
    align-items: start;
  }
  .summary-panel {
    top: 1.25rem;
    position: sticky;
    bottom: auto;
  }
}