/* Reset & Base */
* { box-sizing: border-box; margin:0; padding:0; }
body { font-family: system-ui, -apple-system, sans-serif; background:#f9f9fb; color:#1a1a1a; line-height:1.5; }
.container { max-width: 600px; margin: 2rem auto; padding: 1.5rem; background:#fff; border-radius:12px; box-shadow:0 4px 12px rgba(0,0,0,0.05); }

/* Typography */
h1 { font-size:1.75rem; margin-bottom:0.5rem; }
.subtitle { color:#555; margin-bottom:1.5rem; }
label { display:block; margin-bottom:0.35rem; font-weight:600; }
.req { color:#d32f2f; }

/* Form */
.field + .field { margin-top:1rem; }
select, input[type=number] {
  width:100%; padding:0.75rem; font-size:1rem; border:1px solid #ccc; border-radius:8px;
  transition:border 0.2s;
}
select:focus, input:focus { outline:none; border-color:#1976d2; }

/* Checkbox Field */
.checkbox-field {
  margin: 1.5rem 0;
  display: flex;
  flex-direction: column;
}
.checkbox-label {
  font-weight: 600;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.help-text {
  font-size: 0.85rem;
  color: #d32f2f;
  margin-top: 0.25rem;
  font-style: italic;
}

/* Disabled field */
#fitness-field {
  transition: opacity 0.2s ease;
}
#fitness-field.disabled {
  opacity: 0.5;
  pointer-events: none;
}
#fitness-field select:disabled {
  background-color: #f5f5f5;
  color: #999;
  cursor: not-allowed;
  border-color: #ddd;
}

/* Output */
.output { margin-top:2rem; padding:1rem; background:#e3f2fd; border-radius:8px; min-height:120px; }
.placeholder { color:#666; font-style:italic; }

/* Table */
.plan-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}
.plan-table th, .plan-table td {
  padding: 0.5rem;
  border: 1px solid #ddd;
  text-align: left;
}
.plan-table th {
  background: #1976d2;
  color: white;
}
.plan-table tr:nth-child(even) {
  background: #f5f5f5;
}
.note {
  background: #fff3cd;
  padding: 0.75rem;
  border-left: 4px solid #ffc107;
  border-radius: 4px;
  margin-top: 1rem;
}
.print-btn {
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  background: #1976d2;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}
.print-btn:hover { background: #1565c0; }

/* Disclaimer */
.disclaimer { margin-top:2rem; font-size:0.875rem; color:#555; border-top:1px solid #eee; padding-top:1rem; }

/* Responsive */
@media (max-width: 480px) {
  .container { margin:1rem; padding:1rem; }
}