/* ==========================================================================
   SCORE2 Calculator — Prototype styles
   Palette: white surface, slate text, muted teal accent, calm medical feel.
   ========================================================================== */

:root {
  --color-bg: #f7f9fa;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;

  --color-accent: #0d9488;
  --color-accent-dark: #0f766e;
  --color-accent-light: #ccfbf1;

  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;

  --color-warning: #b45309;
  --color-warning-bg: #fffbeb;
  --color-warning-border: #fde68a;

  --color-low: #16a34a;
  --color-low-bg: #f0fdf4;
  --color-high: #d97706;
  --color-high-bg: #fffbeb;
  --color-veryhigh: #dc2626;
  --color-veryhigh-bg: #fef2f2;

  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 8px;
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.06);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
}

* , *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 880px;
  margin: 0 auto;
  padding-inline: var(--space-5);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 100;
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

h1, h2, h3 { color: var(--color-text); font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.6rem, 3vw, 2.25rem); margin: var(--space-4) 0 var(--space-3); }
h2 { font-size: 1.25rem; margin: 0 0 var(--space-4); }
h3 { font-size: 1rem; margin: 0 0 var(--space-2); }

a { color: var(--color-accent-dark); }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, #ecfdf9 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-7) var(--space-6);
}
.hero__inner { text-align: center; }
.hero__subtitle {
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto;
  font-size: 1.05rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  margin-bottom: var(--space-3);
}
.badge--warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
  border: 1px solid var(--color-warning-border);
}

/* ---------- Layout / cards ---------- */
main { padding-block: var(--space-6) var(--space-7); display: flex; flex-direction: column; gap: var(--space-6); }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
}

/* ---------- Eligibility ---------- */
.eligibility-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}
.eligibility-col { padding: var(--space-4); border-radius: var(--radius-md); }
.eligibility-col--ok { background: var(--color-low-bg); border: 1px solid #bbf7d0; }
.eligibility-col--not { background: var(--color-danger-bg); border: 1px solid var(--color-danger-border); }
.eligibility-col ul { margin: 0; padding-left: 1.15em; display: flex; flex-direction: column; gap: var(--space-2); }
.eligibility-col--ok h3 { color: #15803d; }
.eligibility-col--not h3 { color: #b91c1c; }

.exclusions { border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); margin: 0; }
.exclusions legend { font-weight: 600; padding: 0 var(--space-2); }
.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  cursor: pointer;
}
.checkbox-row input { margin-top: 3px; width: 18px; height: 18px; accent-color: var(--color-danger); flex-shrink: 0; }

.alert {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
}
.alert--danger {
  background: var(--color-danger-bg);
  border: 1px solid var(--color-danger-border);
  color: #991b1b;
}

/* ---------- Form ---------- */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}
.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field-label, label { font-size: 0.875rem; font-weight: 600; color: var(--color-text); }
.optional-tag { font-weight: 400; color: var(--color-text-muted); }

input[type="number"], input[type="text"], select {
  font: inherit;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  width: 100%;
}
input:focus-visible, select:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}
input:disabled { background: #f1f5f9; color: var(--color-text-muted); }
input.is-invalid { border-color: var(--color-danger); background: var(--color-danger-bg); }

.field-error {
  min-height: 1.1em;
  font-size: 0.8rem;
  color: var(--color-danger);
  margin: 0;
}

.field__header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }

/* Segmented control */
.segmented { display: inline-flex; border: 1px solid var(--color-border); border-radius: var(--radius-sm); overflow: hidden; }
.segmented__btn {
  flex: 1;
  border: none;
  background: var(--color-surface);
  color: var(--color-text-muted);
  font: inherit;
  font-weight: 600;
  padding: 10px 16px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.segmented__btn + .segmented__btn { border-left: 1px solid var(--color-border); }
.segmented__btn[aria-pressed="true"] { background: var(--color-accent); color: #fff; }
.segmented__btn:hover:not([aria-pressed="true"]) { background: var(--color-accent-light); }

/* Unit toggle */
.unit-toggle { display: inline-flex; border: 1px solid var(--color-border); border-radius: 999px; padding: 2px; }
.unit-toggle__btn {
  border: none;
  background: transparent;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  padding: 4px 10px;
  border-radius: 999px;
  cursor: pointer;
}
.unit-toggle__btn[aria-pressed="true"] { background: var(--color-accent-dark); color: #fff; }

/* Advanced settings */
.advanced { margin-top: var(--space-5); border-top: 1px dashed var(--color-border); padding-top: var(--space-4); }
.advanced summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-accent-dark);
  list-style: none;
}
.advanced summary::-webkit-details-marker { display: none; }
.advanced summary::before { content: "▸ "; }
.advanced[open] summary::before { content: "▾ "; }
.advanced__body { margin-top: var(--space-4); display: flex; flex-direction: column; gap: var(--space-4); }
.algorithm-mode { margin: 0; font-size: 0.9rem; display: flex; gap: var(--space-2); }
.dev-note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-warning);
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

/* Actions */
.form-actions { display: flex; gap: var(--space-3); margin-top: var(--space-6); flex-wrap: wrap; }
.btn {
  font: inherit;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.05s, background 0.15s, box-shadow 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--color-accent); color: #fff; box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25); }
.btn--primary:hover { background: var(--color-accent-dark); }
.btn--primary:disabled { background: #94a3b8; box-shadow: none; cursor: not-allowed; }
.btn--ghost { background: transparent; color: var(--color-text); border-color: var(--color-border); }
.btn--ghost:hover { background: var(--color-bg); }

/* ---------- Results ---------- */
.demo-flag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-warning);
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: 999px;
  padding: var(--space-1) var(--space-3);
  margin-bottom: var(--space-4);
}

.results-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-6);
  align-items: center;
  margin-bottom: var(--space-4);
}
.result-risk { display: flex; flex-direction: column; align-items: center; gap: var(--space-1); }
.result-risk__value { font-size: 3rem; font-weight: 800; color: var(--color-accent-dark); line-height: 1; }
.result-risk__label { font-size: 0.8rem; color: var(--color-text-muted); text-align: center; max-width: 140px; }

.result-meta__row { display: flex; justify-content: space-between; gap: var(--space-3); padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); font-size: 0.9rem; }
.result-meta__row:last-child { border-bottom: none; }
.result-meta__row span { color: var(--color-text-muted); }

.badge {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}
.badge--low-moderate { background: var(--color-low-bg); color: var(--color-low); }
.badge--high { background: var(--color-high-bg); color: var(--color-high); }
.badge--very-high { background: var(--color-veryhigh-bg); color: var(--color-veryhigh); }

.risk-bar {
  height: 12px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: var(--space-4);
}
.risk-bar__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-low), var(--color-high), var(--color-veryhigh));
  border-radius: 999px;
  transition: width 0.4s ease;
}

.result-interpretation { color: var(--color-text-muted); margin: 0; }

.result-warnings {
  margin: var(--space-4) 0 0;
  font-size: 0.85rem;
  color: var(--color-warning);
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

/* ---------- Comparison ---------- */
.section-hint { color: var(--color-text-muted); margin-top: 0; }
.scenario-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); margin-bottom: var(--space-2); }

.comparison-results {
  margin-top: var(--space-5);
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: var(--space-5);
  align-items: center;
}
.comparison-col { display: flex; flex-direction: column; gap: var(--space-2); }
.comparison-value { font-size: 1.75rem; font-weight: 800; color: var(--color-accent-dark); }
.comparison-diff { text-align: center; padding: var(--space-3); background: var(--color-bg); border-radius: var(--radius-md); }
.comparison-diff span { display: block; font-size: 0.78rem; color: var(--color-text-muted); }
.comparison-diff strong { font-size: 1.25rem; }

/* ---------- Accordion ---------- */
.accordion { display: flex; flex-direction: column; gap: var(--space-2); }
.accordion details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
}
.accordion summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::before { content: "+ "; color: var(--color-accent); }
.accordion details[open] summary::before { content: "− "; }
.accordion__body { padding-top: var(--space-3); color: var(--color-text-muted); }
.source-list { margin: 0; padding-left: 1.2em; display: flex; flex-direction: column; gap: var(--space-1); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-6) var(--space-7);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}
.footer-disclaimer { color: var(--color-text); }
.footer-sources { margin-top: var(--space-4); display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); }
.footer-sources span { font-weight: 600; color: var(--color-text); width: 100%; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .eligibility-grid, .form-grid, .scenario-grid { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; text-align: center; }
  .comparison-results { grid-template-columns: 1fr; }
  .container { padding-inline: var(--space-4); }
  .card { padding: var(--space-5); }
}