/* =========================================================
   Pediatric Fracture Remodeling Simulator
   Clinical / editorial palette — cool slate + clinical teal
   ========================================================= */

:root, [data-theme='light'] {
  /* Type */
  --text-xs:   clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
  --text-lg:   clamp(1.0625rem, 0.95rem + 0.55vw, 1.25rem);
  --text-xl:   clamp(1.5rem, 1.2rem + 1.25vw, 2rem);
  --text-2xl:  clamp(1.9rem, 1.2rem + 2.2vw, 3rem);

  /* Spacing */
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem;

  /* Surfaces — cool clinical paper */
  --color-bg:               #f4f6f8;
  --color-surface:          #ffffff;
  --color-surface-2:        #fbfcfd;
  --color-surface-offset:   #eef2f6;
  --color-surface-offset-2: #e5ebf1;
  --color-divider:          #dde3ea;
  --color-border:           #cfd6df;

  /* Text */
  --color-text:        #0f1c2e;
  --color-text-muted:  #4f5d70;
  --color-text-faint:  #8693a6;
  --color-text-inverse:#ffffff;

  /* Primary — clinical teal */
  --color-primary:           #0e7c86;
  --color-primary-hover:     #0a626a;
  --color-primary-active:    #074a51;
  --color-primary-highlight: #d4eaec;

  /* Status */
  --color-success:           #2f7a3a;
  --color-success-highlight: #d8ebd9;
  --color-warning:           #a85a00;
  --color-warning-highlight: #f4e2c6;
  --color-error:             #b3261e;
  --color-error-highlight:   #f5d6d2;

  /* Data viz */
  --color-blue:    #1f6feb;
  --color-purple:  #6b46c1;
  --color-gold:    #c08a00;

  /* Radii / shadows */
  --radius-sm: 0.375rem; --radius-md: 0.5rem; --radius-lg: 0.75rem;
  --radius-xl: 1rem;     --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 240 / 0.06);
  --shadow-md: 0 4px 14px oklch(0.2 0.02 240 / 0.08);
  --shadow-lg: 0 18px 38px oklch(0.2 0.02 240 / 0.12);

  --content-default: 1180px;
  --content-wide: 1320px;

  --font-display: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --font-body:    'Inter', system-ui, -apple-system, 'Segoe UI', Helvetica, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

[data-theme='dark'] {
  --color-bg:               #0a1018;
  --color-surface:          #111922;
  --color-surface-2:        #161f29;
  --color-surface-offset:   #1a242f;
  --color-surface-offset-2: #1e2a37;
  --color-divider:          #1f2b38;
  --color-border:           #2a3744;

  --color-text:        #e6edf5;
  --color-text-muted:  #8595a9;
  --color-text-faint:  #5a6779;
  --color-text-inverse:#0a1018;

  --color-primary:           #4cbac4;
  --color-primary-hover:     #6cd0d9;
  --color-primary-active:    #2a9ba6;
  --color-primary-highlight: #1c3a3e;

  --color-success:           #6bb874;
  --color-success-highlight: #1d3322;
  --color-warning:           #e0a657;
  --color-warning-highlight: #3a2c14;
  --color-error:             #ef6b63;
  --color-error-highlight:   #3a1c1a;

  --color-blue:    #6aa3ff;
  --color-purple:  #b08bee;
  --color-gold:    #e0b850;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.4);
  --shadow-md: 0 6px 18px oklch(0 0 0 / 0.5);
  --shadow-lg: 0 22px 48px oklch(0 0 0 / 0.55);
}

/* ---------- Layout ---------- */

.app-shell {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-6) var(--space-5);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-divider);
  margin-bottom: var(--space-8);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.brand-mark {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--color-primary) 14%, var(--color-surface));
  display: grid; place-items: center;
  color: var(--color-primary);
}
.brand-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.brand-sub {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.header-actions { display: flex; gap: var(--space-2); align-items: center; }
.icon-btn {
  width: 38px; height: 38px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: grid; place-items: center;
  background: var(--color-surface);
  color: var(--color-text);
}
.icon-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ---------- Hero ---------- */

.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding: var(--space-6) 0 var(--space-8);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
  font-weight: 500;
}
.hero h1 em {
  font-style: italic;
  color: var(--color-primary);
}
.hero p {
  max-width: 70ch;
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

.disclaimer {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in oklab, var(--color-warning) 35%, var(--color-border));
  background: color-mix(in oklab, var(--color-warning-highlight) 70%, var(--color-surface));
  color: var(--color-text);
  font-size: var(--text-sm);
  align-items: flex-start;
}
.disclaimer strong { color: var(--color-warning); }
.disclaimer svg { flex-shrink: 0; color: var(--color-warning); margin-top: 2px; }

/* ---------- Main grid ---------- */

.workspace {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: var(--space-6);
  align-items: start;
}

@media (max-width: 900px) {
  .workspace { grid-template-columns: 1fr; }
}

/* ---------- Card ---------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.card + .card { margin-top: var(--space-5); }
.card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.card-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.005em;
}
.card-header .kicker {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  font-weight: 500;
}

/* ---------- Form ---------- */

.form-group { margin-bottom: var(--space-4); }
.form-group:last-child { margin-bottom: 0; }
.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}
.form-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
  display: block;
}

.input, .select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-sm);
}
.input:focus, .select:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary) 22%, transparent); }
.select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--color-text-muted) 50%), linear-gradient(135deg, var(--color-text-muted) 50%, transparent 50%); background-position: calc(100% - 18px) 50%, calc(100% - 12px) 50%; background-size: 6px 6px; background-repeat: no-repeat; padding-right: 32px; }

.age-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }

.segmented {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 3px;
}
.segmented input { display: none; }
.segmented label {
  text-align: center;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  margin: 0;
  color: var(--color-text-muted);
  transition: var(--transition-interactive);
}
.segmented input:checked + label {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.slider-wrap { display: flex; align-items: center; gap: var(--space-3); }
.slider-wrap input[type=range] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--color-surface-offset-2);
  border-radius: 999px;
}
.slider-wrap input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  background: var(--color-primary);
  border-radius: 999px;
  border: 3px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}
.slider-wrap input[type=range]::-moz-range-thumb {
  width: 18px; height: 18px;
  background: var(--color-primary);
  border-radius: 999px;
  border: 3px solid var(--color-surface);
  cursor: pointer;
}
.slider-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  min-width: 56px;
  text-align: right;
  color: var(--color-text);
  background: var(--color-surface-offset);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.btn-primary {
  width: 100%;
  padding: 12px 18px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
}
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary:active { background: var(--color-primary-active); }

/* ---------- Results ---------- */

.verdict {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
}
.verdict-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  display: grid; place-items: center;
  color: var(--color-text-inverse);
  background: var(--color-primary);
}
.verdict-icon.is-success { background: var(--color-success); }
.verdict-icon.is-warning { background: var(--color-warning); }
.verdict-icon.is-error   { background: var(--color-error); }

.verdict-text h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
}
.verdict-text p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: 2px;
}
.verdict-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-primary);
}

.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-5);
}
.kpi {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}
.kpi .kpi-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  font-weight: 500;
}
.kpi .kpi-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: var(--space-2);
}
.kpi .kpi-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ---------- Charts ---------- */

.chart-wrap {
  position: relative;
  width: 100%;
  height: 260px;
}
.chart-wrap.tall { height: 320px; }

/* ---------- Phase timeline ---------- */

.phase-timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.phase-bar {
  position: relative;
  display: grid;
  grid-template-columns: 160px 1fr 110px;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
}
.phase-bar .phase-name { font-weight: 500; }
.phase-bar .phase-track {
  position: relative;
  height: 28px;
  background: var(--color-surface-offset);
  border-radius: 6px;
  overflow: hidden;
}
.phase-bar .phase-fill {
  position: absolute;
  top: 0; bottom: 0;
  border-radius: 6px;
  display: flex; align-items: center; padding: 0 10px;
  color: var(--color-text-inverse);
  font-size: var(--text-xs);
  font-weight: 500;
  white-space: nowrap;
}
.phase-fill.inflam   { background: linear-gradient(90deg, #b3261e, #d8554d); }
.phase-fill.reparat  { background: linear-gradient(90deg, var(--color-warning), #d18b3a); }
.phase-fill.remodel  { background: linear-gradient(90deg, var(--color-primary), #4bb1ba); }
.phase-bar .phase-dur {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-text-muted);
  text-align: right;
  font-size: var(--text-xs);
}

@media (max-width: 640px) {
  .phase-bar { grid-template-columns: 1fr; }
  .phase-bar .phase-track { height: 22px; }
  .phase-bar .phase-dur { text-align: left; }
}

/* ---------- Follow-up schedule ---------- */

.schedule {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}
.schedule-row {
  display: grid;
  grid-template-columns: 76px 1fr auto;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  align-items: center;
}
.schedule-row .sr-when {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--color-primary);
  font-size: var(--text-sm);
}
.schedule-row .sr-action { font-size: var(--text-sm); }
.schedule-row .sr-action span { display: block; color: var(--color-text-muted); font-size: var(--text-xs); margin-top: 2px; }
.schedule-row .sr-tag {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.schedule-row .sr-tag.is-key { background: var(--color-primary-highlight); color: var(--color-primary); }

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

.bone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}
.bone-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: flex; flex-direction: column; gap: var(--space-3);
}
.bone-card.is-active {
  border-color: var(--color-primary);
  background: color-mix(in oklab, var(--color-primary) 6%, var(--color-surface));
}
.bone-card .bc-head {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-2);
}
.bone-card .bc-head h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
}
.bc-icon { color: var(--color-primary); }
.bone-card table { font-size: var(--text-xs); }
.bone-card th, .bone-card td { text-align: left; padding: 6px 8px; }
.bone-card th { font-weight: 500; color: var(--color-text-muted); background: var(--color-surface-offset); }
.bone-card tr + tr td { border-top: 1px solid var(--color-divider); }
.bone-card td:nth-child(2), .bone-card td:nth-child(3) {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.bone-card .bc-note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  border-top: 1px dashed var(--color-divider);
  padding-top: var(--space-2);
}

/* ---------- Footer / refs ---------- */

.refs {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  line-height: 1.7;
}
.refs h2 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.refs ol { padding-left: 1.2rem; }
.refs a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 2px; }
.refs a:hover { color: var(--color-primary-hover); }
.refs a[target='_blank']::after { content: ' ↗'; font-size: 0.85em; opacity: 0.7; }

.app-foot {
  margin-top: var(--space-8);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
  padding-bottom: var(--space-8);
}

/* ---------- Acceptability banner ---------- */

.accept-banner {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  display: flex; align-items: center; gap: var(--space-3);
  font-size: var(--text-sm);
}
.accept-banner.is-ok    { background: var(--color-success-highlight); color: var(--color-success); border: 1px solid color-mix(in oklab, var(--color-success) 25%, var(--color-border)); }
.accept-banner.is-edge  { background: var(--color-warning-highlight); color: var(--color-warning); border: 1px solid color-mix(in oklab, var(--color-warning) 25%, var(--color-border)); }
.accept-banner.is-over  { background: var(--color-error-highlight);   color: var(--color-error);   border: 1px solid color-mix(in oklab, var(--color-error) 25%, var(--color-border)); }
.accept-banner svg { flex-shrink: 0; }

.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.empty-state svg { color: var(--color-text-faint); margin: 0 auto var(--space-3); }

/* ---------- Measurement card ---------- */

.measure-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--space-6);
  align-items: start;
}
@media (max-width: 820px) {
  .measure-grid { grid-template-columns: 1fr; }
}

.measure-panel {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}
.measure-status {
  font-size: var(--text-sm);
  color: var(--color-text);
  padding: var(--space-3);
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  min-height: 60px;
  line-height: 1.5;
}
.measure-actions {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.btn-secondary {
  padding: 10px 14px;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: var(--text-sm);
}
.btn-secondary:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-secondary:disabled, .btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.measure-legend {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.7;
}
.measure-legend .dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 999px;
  margin-right: 6px;
  vertical-align: middle;
}

.measure-image-wrap {
  position: relative;
  background: var(--color-surface-offset);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  min-height: 280px;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.measure-image-wrap canvas {
  display: block;
  max-width: 100%;
  cursor: crosshair;
  touch-action: none;
}
.measure-image-wrap .measure-placeholder {
  text-align: center;
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}
.measure-image-wrap .measure-placeholder p { margin-top: var(--space-2); }
.measure-image-wrap.has-image .measure-placeholder { display: none; }

/* utility */
.flex { display: flex; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.mt-3 { margin-top: var(--space-3); }
.mt-5 { margin-top: var(--space-5); }
.text-muted { color: var(--color-text-muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }