/*
 * QACalc.site - ERA Calculator Styles (era.css)
 * Namespace: .qacalc-era
 * Mobile-first, responsive, dark mode.
 */

.qacalc-era {
  --primary-color: #0073e6;
  --primary-hover: #005bbd;
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-light: #718096;
  --bg-main: #ffffff;
  --bg-card: #f7fafc;
  --border-color: #e2e8f0;
  --focus-ring: rgba(0, 115, 230, 0.2);
  --error-color: #e53e3e;

  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-main);
}

@media (prefers-color-scheme: dark) {
  .qacalc-era {
    --text-primary: #edf2f7;
    --text-secondary: #a0aec0;
    --text-light: #a0aec0;
    --bg-main: #1a202c;
    --bg-card: #2d3748;
    --border-color: #4a5568;
    --error-color: #fc8181;
  }
}

/* Layout */
.qacalc-era {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 1rem;
}
.era-header { text-align: center; margin-bottom: 2rem; }
.era-header h1 { font-size: clamp(1.75rem, 5vw, 2.5rem); margin: 0 0 0.5rem; }
.era-subtitle { font-size: clamp(1rem, 2.5vw, 1.125rem); color: var(--text-secondary); max-width: 650px; margin: 0 auto; }

.era-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; }
@media (min-width: 960px) { .era-grid { grid-template-columns: 1fr 1fr; gap: 3rem; } }

/* Form */
.era-form {
  background-color: var(--bg-card);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.form-group { display: flex; flex-direction: column; }
.form-label { font-weight: 600; font-size: 0.95rem; margin-bottom: 0.5rem; }

.form-input, .form-select {
  width: 100%; padding: 0.75rem 1rem; font-size: 1rem;
  background-color: var(--bg-main); color: var(--text-primary);
  border: 1px solid var(--border-color); border-radius: 8px; box-sizing: border-box;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none; -moz-appearance: none; appearance: none;
}

.form-select {
  background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23718096%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
  background-repeat: no-repeat; background-position: right 1rem center;
  background-size: 0.65em auto; padding-right: 2.5rem;
}

.form-input:focus, .form-select:focus {
  outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px var(--focus-ring);
}
.form-helper { font-size: 0.875rem; color: var(--text-light); margin-top: 0.5rem; }

.field-error {
  color: var(--error-color); font-size: 0.875rem; font-weight: 500;
  margin-top: 0.5rem; min-height: 1.2em;
}

/* Actions & Buttons */
.era-actions { display: grid; grid-template-columns: 1fr; gap: 0.75rem; }
.action-group { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.75rem 1rem; font-size: 1rem; font-weight: 600; border-radius: 8px;
  border: 1px solid transparent; cursor: pointer; transition: all 0.2s; text-decoration: none;
}
.btn-primary { background-color: var(--primary-color); color: #fff; }
.btn-primary:hover { background-color: var(--primary-hover); }
.btn-secondary { background-color: var(--bg-card); color: var(--text-secondary); border-color: var(--border-color); }
.btn-secondary:hover { background-color: var(--border-color); color: var(--text-primary); }
.btn-tertiary { background: transparent; color: var(--text-secondary); }
.btn-tertiary:hover { background: var(--border-color); color: var(--text-primary); }
.btn-example {
  background-color: var(--bg-main); color: var(--text-secondary); border: 1px dashed var(--border-color);
  font-size: 0.875rem; padding: 0.5rem 0.75rem;
}
.btn-example:hover { background-color: var(--border-color); color: var(--text-primary); }

.era-examples { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }

/* Segmented control */
.segmented-control { display: flex; width: 100%; }
.segmented-control input[type="radio"] { display: none; }
.segmented-control label {
  flex: 1; text-align: center; padding: 0.5rem 0.75rem; border: 1px solid var(--border-color);
  cursor: pointer; background-color: var(--bg-main); transition: background-color 0.2s; font-size: 0.9rem;
}
.segmented-control label:first-of-type { border-radius: 8px 0 0 8px; }
.segmented-control label:last-of-type { border-radius: 0 8px 8px 0; border-left-width: 0; }
.segmented-control input[type="radio"]:checked + label {
  background-color: var(--primary-color); color: #fff; border-color: var(--primary-color);
}
.segmented-control select { flex: 1; }
.segmented-control.two-segment select { border-radius: 8px 0 0 8px; }
.segmented-control.two-segment input {
  border-radius: 0 8px 8px 0; border-left-width: 0; text-align: center; width: 80px; flex-shrink: 0; flex-grow: 0;
}

/* Result & FAQ */
.era-result-area { padding-top: 1.5rem; }
@media (min-width: 960px) { .era-result-area { padding-top: 0; } }

.result-card {
  background-color: var(--bg-card); padding: 2rem; border-radius: 12px;
  border: 1px solid var(--border-color); text-align: center;
}
.result-label { font-size: 1.125rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.result-value {
  font-size: clamp(3.5rem, 12vw, 5rem); font-weight: 700; line-height: 1.1;
  color: var(--primary-color); margin-bottom: 1rem; transition: transform 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}
.result-summary { font-size: 0.95rem; color: var(--text-secondary); min-height: 1.2em; margin-bottom: 1rem; }
.formula { font-size: 0.8rem; color: var(--text-light); background-color: var(--bg-main); padding: 0.5rem; border-radius: 4px; }

.result-card.updated .result-value { transform: scale(1.05); }
@media (prefers-reduced-motion: reduce) { .result-card.updated .result-value { transform: none; } }

.era-faq { margin-top: 2rem; }
.era-faq details { background-color: var(--bg-card); border: 1px solid var(--border-color); border-radius: 8px; margin-bottom: 0.5rem; }
.era-faq summary { padding: 1rem; font-weight: 600; cursor: pointer; position: relative; }
.era-faq summary::after { content: '+'; position: absolute; right: 1rem; font-size: 1.5rem; transition: transform 0.2s; }
.era-faq details[open] summary::after { transform: rotate(45deg); }
.era-faq details p { padding: 0 1rem 1rem 1rem; margin: 0; color: var(--text-secondary); line-height: 1.6; }