:root {
  --bg: #f4f6f8;
  --card-bg: #ffffff;
  --text: #1c2733;
  --text-muted: #5a6b7b;
  --primary: #0d6e6e;
  --primary-dark: #0a5757;
  --accent: #c05621;
  --border: #dbe2e8;
  --amber-bg: #fff8e6;
  --amber-border: #f0c766;
  --danger: #b3261e;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(20, 30, 40, 0.08), 0 1px 2px rgba(20, 30, 40, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

#app {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.app-header {
  margin-bottom: 20px;
}

.app-header h1 {
  font-size: 1.5rem;
  margin: 0 0 4px;
  color: var(--primary-dark);
}

.app-header .subtitle {
  margin: 0 0 10px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.header-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 16px;
}

.card h2 {
  margin-top: 0;
  font-size: 1.25rem;
  color: var(--primary-dark);
}

.disclaimer-card {
  border-left: 4px solid var(--amber-border);
  background: var(--amber-bg);
}

.disclaimer-card p {
  color: var(--text);
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 18px 0;
  font-size: 0.95rem;
  cursor: pointer;
}

.checkbox-row input {
  margin-top: 3px;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.primary-btn, .secondary-btn, .option-btn {
  font-size: 0.95rem;
  font-family: inherit;
  border-radius: 8px;
  cursor: pointer;
  padding: 12px 18px;
  border: 1px solid transparent;
  transition: background 0.15s, opacity 0.15s;
}

.primary-btn {
  background: var(--primary);
  color: white;
  font-weight: 600;
}

.primary-btn:hover:not(:disabled) {
  background: var(--primary-dark);
}

.primary-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.secondary-btn {
  background: white;
  border-color: var(--border);
  color: var(--text);
}

.secondary-btn:hover {
  background: #f0f3f5;
}

.link-btn {
  background: none;
  border: none;
  color: var(--primary-dark);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 4px 6px;
  text-decoration: underline;
}

.back-btn {
  display: block;
  margin-top: 14px;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 18px 0;
}

.option-btn {
  background: white;
  border: 1px solid var(--border);
  text-align: left;
  color: var(--text);
  font-size: 1rem;
}

.option-btn:hover {
  border-color: var(--primary);
  background: #eef7f7;
}

.prompt {
  font-size: 1.08rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0;
}

.input-row input {
  font-size: 1.1rem;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 140px;
}

.info-block, .tip-callout {
  margin: 12px 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  background: #f8fafb;
}

.tip-callout {
  background: #eef6fb;
  border-color: #bcdcf0;
}

.info-block summary, .tip-callout summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--primary-dark);
  padding: 6px 0;
}

.info-block-body {
  padding: 6px 4px 10px;
  font-size: 0.92rem;
  color: var(--text);
}

.info-block-body ul {
  margin: 6px 0;
  padding-left: 20px;
}

.info-block-body p {
  margin: 8px 0;
}

.result-card {
  border-left: 4px solid var(--primary);
}

.result-tag {
  display: inline-block;
  background: var(--primary);
  color: white;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  margin-bottom: 8px;
}

.cause-context {
  background: #f8fafb;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 0.9rem;
}

.detail {
  color: var(--text-muted);
}

.therapy-list {
  padding-left: 20px;
}

.therapy-list li {
  margin-bottom: 6px;
}

.result-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.water-calc {
  margin-top: 18px;
  padding: 14px 16px;
  background: #f8fafb;
  border: 1px dashed var(--border);
  border-radius: 8px;
}

.water-calc h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--accent);
}

.formula {
  font-family: "SF Mono", Menlo, monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.calc-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 10px 0;
}

.calc-row label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.calc-row input, .calc-row select {
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
}

.calc-result {
  font-weight: 600;
  color: var(--primary-dark);
}

.trail {
  margin-top: 18px;
  font-size: 0.85rem;
}

.trail summary {
  cursor: pointer;
  color: var(--text-muted);
}

.trail-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}

.trail-table td {
  border-bottom: 1px solid var(--border);
  padding: 6px 4px;
  font-size: 0.85rem;
  vertical-align: top;
}

.trail-table td:first-child {
  color: var(--text-muted);
  width: 55%;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 30, 40, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}

.modal {
  background: white;
  border-radius: var(--radius);
  padding: 24px;
  max-width: 560px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
}

.modal h2 {
  margin-top: 0;
  color: var(--primary-dark);
}

.modal-close {
  margin-top: 16px;
}

@media (max-width: 480px) {
  #app {
    padding: 16px 12px 48px;
  }
  .card {
    padding: 16px;
  }
  .calc-row {
    flex-direction: column;
  }
}

@media print {
  .header-actions, .result-actions, .back-btn {
    display: none !important;
  }
  .card {
    box-shadow: none;
    border: none;
  }
  /* Il riepilogo delle risposte è utile in stampa come documentazione del percorso seguito */
  .trail:not([open]) > *:not(summary) {
    display: block !important;
  }
  .trail summary::-webkit-details-marker {
    display: none;
  }
}