:root {
  --bg: #fafbfc;
  --bg-2: #f4f6fa;
  --pane: #ffffff;
  --pane-soft: #f6f8fb;
  --border: #e3e8ef;
  --border-strong: #cbd3df;
  --text: #0c111d;
  --text-muted: #5b657a;
  --text-faint: #8a93a3;

  --primary: #0ea5e9;          /* sky */
  --primary-deep: #0369a1;
  --primary-soft: #e0f2fe;
  --accent: #6366f1;            /* indigo */

  --normal: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;

  --acuity-1: #dc2626;
  --acuity-2: #ea580c;
  --acuity-3: #ca8a04;
  --acuity-4: #16a34a;
  --acuity-5: #0ea5e9;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow: 0 6px 24px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.12);
  --radius: 14px;
  --radius-sm: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(1200px 600px at 50% -200px, rgba(14, 165, 233, 0.06), transparent 60%),
    var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

button { font: inherit; cursor: pointer; }

/* ====== topbar ====== */
.topbar {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 40;
}
.topbar-inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
}
.brand-mark {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  position: relative;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}
.brand-mark::before, .brand-mark::after {
  content: "";
  position: absolute;
  background: white;
  border-radius: 1px;
}
.brand-mark::before {
  left: 50%; top: 25%;
  width: 4px; height: 50%;
  transform: translateX(-50%);
}
.brand-mark::after {
  top: 50%; left: 25%;
  height: 4px; width: 50%;
  transform: translateY(-50%);
}
.brand-name { font-weight: 700; letter-spacing: -0.01em; font-size: 1.05rem; }
.brand-name-soft { color: var(--text-muted); font-weight: 500; }

.top-meta { display: flex; align-items: center; gap: 0.6rem; }
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.32rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: white;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}
.status-pill .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--text-faint);
  transition: all 0.2s;
}
.status-pill.ok .dot {
  background: var(--normal);
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.15);
}
.status-pill.degraded .dot { background: var(--danger); }

.ghost-btn {
  font-weight: 500;
  font-size: 0.85rem;
  padding: 0.45rem 0.95rem;
  border: 1px solid var(--border);
  background: white;
  color: var(--text-muted);
  border-radius: 8px;
  transition: all 0.15s;
}
.ghost-btn:hover { background: var(--pane-soft); color: var(--text); border-color: var(--border-strong); }

/* ====== page wrapper ====== */
.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.intro { margin-bottom: 3rem; text-align: center; }
.intro h1 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 500;
  font-size: clamp(2rem, 4vw, 2.75rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.6rem;
  line-height: 1.1;
}
.intro p {
  margin: 0 auto;
  max-width: 580px;
  color: var(--text-muted);
  font-size: 1rem;
}

/* ====== step sections ====== */
.step { margin-bottom: 2.75rem; }

.step-head {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
  margin-bottom: 1.4rem;
}
.step-num {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 500;
  font-size: 1.6rem;
  color: var(--primary);
  letter-spacing: -0.02em;
  flex-shrink: 0;
  width: 2.6rem;
  padding-top: 0.05rem;
  position: relative;
}
.step-num::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.4rem;
  width: 1.4rem;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  opacity: 0.5;
}
.step-head h2 {
  margin: 0 0 0.25rem;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.step-sub {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ====== monitor-style vital cards ====== */
.monitor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(135px, 1fr));
  gap: 0.75rem;
}
.monitor-card {
  background: var(--pane);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 0.95rem 0.75rem;
  transition: border-color 0.18s, background 0.18s, box-shadow 0.18s;
  position: relative;
}
.monitor-card:hover { border-color: var(--border-strong); }
.monitor-card:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.12);
}
.monitor-card.borderline { border-color: var(--warn); background: rgba(217, 119, 6, 0.04); }
.monitor-card.abnormal { border-color: var(--danger); background: rgba(220, 38, 38, 0.05); }

.m-top {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}
.m-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.m-unit {
  font-size: 0.7rem;
  color: var(--text-faint);
  font-weight: 500;
}
.m-flag {
  margin-left: auto;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: transparent;
  transition: background 0.15s, box-shadow 0.15s;
}
.m-flag[data-state="normal"] { background: var(--normal); }
.m-flag[data-state="borderline"] { background: var(--warn); }
.m-flag[data-state="abnormal"] {
  background: var(--danger);
  box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.18);
}

.monitor-card input {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  font: 600 1.55rem/1.1 'JetBrains Mono', ui-monospace, monospace;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  padding: 0;
  letter-spacing: -0.02em;
}
.monitor-card input::placeholder { color: var(--text-faint); font-weight: 500; }
.monitor-card input::-webkit-outer-spin-button,
.monitor-card input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.monitor-card input[type=number] { -moz-appearance: textfield; }

.m-range {
  font: 500 0.72rem/1 'JetBrains Mono', ui-monospace, monospace;
  color: var(--text-faint);
  margin-top: 0.4rem;
  letter-spacing: 0.01em;
}

/* derived row */
.derived-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
  padding: 0.7rem 1rem;
  background: var(--pane);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
}
.d-item {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.85rem;
}
.d-label {
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.7rem;
  font-weight: 600;
}
.d-val {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}
.d-unit { color: var(--text-faint); font-size: 0.72rem; }
.d-divider { width: 1px; height: 18px; background: var(--border); }

/* ====== pain scale ====== */
.pain-scale {
  display: grid;
  grid-template-columns: repeat(11, 1fr);
  gap: 0.4rem;
}
.pain-btn {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.85rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--pane);
  color: var(--text);
  transition: all 0.12s;
  text-align: center;
}
.pain-btn:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.pain-btn:active { transform: translateY(0); }
.pain-btn.selected {
  border-color: transparent;
  color: white;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.18);
  transform: translateY(-1px);
}
.pain-btn[data-score="0"].selected,
.pain-btn[data-score="1"].selected,
.pain-btn[data-score="2"].selected,
.pain-btn[data-score="3"].selected { background: linear-gradient(135deg, #22c55e, #15803d); }
.pain-btn[data-score="4"].selected,
.pain-btn[data-score="5"].selected,
.pain-btn[data-score="6"].selected { background: linear-gradient(135deg, #f59e0b, #b45309); }
.pain-btn[data-score="7"].selected,
.pain-btn[data-score="8"].selected,
.pain-btn[data-score="9"].selected,
.pain-btn[data-score="10"].selected { background: linear-gradient(135deg, #ef4444, #b91c1c); }

.pain-anchors {
  display: flex;
  justify-content: space-between;
  margin-top: 0.55rem;
  padding: 0 0.2rem;
  font-size: 0.74rem;
  color: var(--text-faint);
}

/* ====== chief complaint ====== */
#cc {
  font: inherit;
  width: 100%;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--pane);
  color: var(--text);
  resize: vertical;
  min-height: 90px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
#cc:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.12);
}
#cc::placeholder { color: var(--text-faint); }

.quickpicks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.85rem;
}
.qp-btn {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  background: var(--pane);
  color: var(--text-muted);
  border-radius: 999px;
  transition: all 0.12s;
}
.qp-btn:hover {
  background: var(--primary-soft);
  color: var(--primary-deep);
  border-color: var(--primary);
}

/* ====== form action bar ====== */
.form-actions {
  margin-top: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.kbd-hint {
  font-size: 0.78rem;
  color: var(--text-faint);
}
.kbd-hint kbd {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  padding: 1px 6px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--pane-soft);
  color: var(--text);
}
.primary-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 600;
  font-size: 0.95rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  color: white;
  border: none;
  border-radius: 10px;
  padding: 0.85rem 1.5rem;
  transition: all 0.15s;
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.3);
}
.primary-btn:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(14, 165, 233, 0.38); }
.primary-btn:active { transform: translateY(0); }
.primary-btn:disabled { opacity: 0.6; cursor: progress; transform: none; }
.btn-arrow { font-size: 1.1rem; line-height: 1; transition: transform 0.18s; }
.primary-btn:hover .btn-arrow { transform: translateX(3px); }

/* ====== result ====== */
.result-wrap {
  margin-top: 3rem;
  animation: fadeUp 0.45s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-card {
  background: var(--pane);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}
.result-stripe {
  height: 6px;
  background: linear-gradient(90deg, #1e293b, #334155);
  transition: background 0.4s;
}
.result-card.a1 .result-stripe { background: linear-gradient(90deg, #ef4444, #b91c1c); }
.result-card.a2 .result-stripe { background: linear-gradient(90deg, #f97316, #c2410c); }
.result-card.a3 .result-stripe { background: linear-gradient(90deg, #facc15, #b45309); }
.result-card.a4 .result-stripe { background: linear-gradient(90deg, #22c55e, #15803d); }
.result-card.a5 .result-stripe { background: linear-gradient(90deg, #38bdf8, #0369a1); }

.result-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0;
}
.result-left {
  padding: 1.75rem 1.5rem;
  border-right: 1px solid var(--border);
  background: var(--pane-soft);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.result-right {
  padding: 1.75rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.esi-display { display: flex; flex-direction: column; gap: 0.65rem; }
.esi-num {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 700;
  font-size: 5.5rem;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--text);
  transition: color 0.4s;
}
.result-card.a1 .esi-num { color: #b91c1c; }
.result-card.a2 .esi-num { color: #c2410c; }
.result-card.a3 .esi-num { color: #b45309; }
.result-card.a4 .esi-num { color: #15803d; }
.result-card.a5 .esi-num { color: #0369a1; }

.esi-tag-row {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
}
.esi-tag-pre {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 600;
}
.esi-tag-name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.esi-target {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.45;
}
.esi-target strong { color: var(--text); }

.result-conf {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.result-conf-label {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 600;
}
.result-conf-val {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--text);
}

.result-section + .result-section { border-top: 1px solid var(--border); padding-top: 1.5rem; }
.section-title {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}
.result-section p {
  margin: 0;
  color: var(--text);
  font-size: 0.94rem;
  line-height: 1.55;
}

.proba-row {
  display: grid;
  grid-template-columns: 24px 1fr 60px;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}
.proba-row .pname {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  color: var(--text-muted);
}
.proba-bar-track {
  background: var(--pane-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  height: 9px;
  overflow: hidden;
}
.proba-bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.proba-bar-fill.a1 { background: var(--acuity-1); }
.proba-bar-fill.a2 { background: var(--acuity-2); }
.proba-bar-fill.a3 { background: var(--acuity-3); }
.proba-bar-fill.a4 { background: var(--acuity-4); }
.proba-bar-fill.a5 { background: var(--acuity-5); }
.proba-row .pval {
  text-align: right;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  font-size: 0.78rem;
}

#feature-pills { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.feat-pill {
  padding: 0.28rem 0.7rem;
  background: var(--primary-soft);
  color: var(--primary-deep);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: 'JetBrains Mono', monospace;
}

.result-disclaimer {
  padding: 0.85rem 1.75rem;
  border-top: 1px solid var(--border);
  background: var(--pane-soft);
  font-size: 0.75rem;
  color: var(--text-faint);
  font-style: italic;
}

/* ====== footer ====== */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding: 1.5rem 1.5rem;
  background: white;
}
.footer-inner {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--text-faint);
}
.footer-stats { font-family: 'JetBrains Mono', monospace; }
.footer-stats span { color: var(--text-muted); font-weight: 600; }

/* ====== responsive ====== */
@media (max-width: 720px) {
  .page { padding: 2rem 1rem 2.5rem; }
  .intro { margin-bottom: 2rem; }
  .step { margin-bottom: 2rem; }
  .step-head { gap: 0.85rem; }
  .step-num { font-size: 1.4rem; width: 2.2rem; }
  .pain-scale { grid-template-columns: repeat(6, 1fr); }
  .pain-anchors { display: none; }
  .form-actions { flex-direction: column-reverse; align-items: stretch; gap: 0.85rem; }
  .form-actions .primary-btn { justify-content: center; }
  .kbd-hint { display: none; }
  .result-grid { grid-template-columns: 1fr; }
  .result-left { border-right: none; border-bottom: 1px solid var(--border); flex-direction: row; align-items: flex-end; }
  .esi-num { font-size: 4.5rem; }
  .footer-inner { flex-direction: column; gap: 0.4rem; text-align: center; }
}