/* =========================================================
   Attendance Rate Calculator — tool-specific styles.
   Layered on /tools/_shared/tool.css.
   Reference shared tokens only; no tokens defined here.
   ========================================================= */

/* ---------- Absent vs present toggle ---------- */
.arc-mode {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
  background: var(--surface-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
}
.arc-mode-opt {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-muted);
  cursor: pointer;
  text-align: center;
  transition: var(--transition-colors);
}
.arc-mode-opt input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}
.arc-mode-opt:has(input:checked) {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}
.arc-mode-opt:has(input:focus-visible) {
  outline: 2px solid var(--accent-ring);
  outline-offset: 2px;
}
.arc-mode-opt strong { font-weight: 700; color: inherit; }

/* ---------- Inputs ---------- */
.arc-inputs {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
@media (min-width: 540px) {
  .arc-inputs { grid-template-columns: 1fr 1fr; }
  .arc-inputs .arc-field:last-child { grid-column: 1 / -1; }
}

.arc-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.arc-field label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}
.arc-field-optional {
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-subtle);
}
.arc-field input {
  width: 100%;
  padding: 14px 18px;
  background: var(--surface-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  text-align: center;
  font-variant-numeric: tabular-nums;
  transition: var(--transition-colors);
}
.arc-field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring);
}
.arc-field input::-webkit-outer-spin-button,
.arc-field input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.arc-field input[type=number] {
  -moz-appearance: textfield;
  appearance: textfield;
}
.arc-hint {
  font-size: 12px;
  line-height: 1.4;
  color: var(--text-muted);
  margin: 0;
}

/* ---------- Result card ---------- */
.arc-result {
  margin-top: var(--space-5);
  padding: var(--space-5) var(--space-5);
  background: var(--surface-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition-colors), border-color 0.18s ease;
}

.arc-result[data-band="empty"] { opacity: 0.65; }

.arc-rate-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-4);
  align-items: baseline;
  padding-bottom: var(--space-4);
  border-bottom: 1px dashed var(--border);
}
.arc-rate {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.arc-rate-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.arc-rate-value {
  font-size: clamp(40px, 10vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  transition: color 0.18s ease;
}
.arc-rate-pct {
  font-size: 0.55em;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 2px;
}
.arc-rate-sub .arc-rate-value {
  font-size: clamp(22px, 5vw, 28px);
  color: var(--text-muted);
}
.arc-rate-sub {
  text-align: right;
}

/* ---------- Band label ---------- */
.arc-band {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-4) 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.arc-band-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-subtle);
  flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(0,0,0,0);
  transition: background 0.18s ease, box-shadow 0.18s ease;
}
.arc-band-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.arc-band-note {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
  flex: 1 1 220px;
}

/* Band tones — color PLUS text label so color isn't carrying the signal alone */
.arc-result[data-band="satisfactory"] .arc-rate-value { color: var(--success); }
.arc-result[data-band="satisfactory"] .arc-band {
  background: color-mix(in srgb, var(--success) 10%, var(--surface));
  border-color: color-mix(in srgb, var(--success) 40%, var(--border));
}
.arc-result[data-band="satisfactory"] .arc-band-dot { background: var(--success); }

.arc-result[data-band="warning"] .arc-rate-value { color: var(--warning); }
.arc-result[data-band="warning"] .arc-band {
  background: color-mix(in srgb, var(--warning) 12%, var(--surface));
  border-color: color-mix(in srgb, var(--warning) 45%, var(--border));
}
.arc-result[data-band="warning"] .arc-band-dot { background: var(--warning); }

.arc-result[data-band="chronic"] .arc-rate-value { color: var(--danger); }
.arc-result[data-band="chronic"] .arc-band {
  background: var(--danger-soft-bg);
  border-color: var(--danger);
}
.arc-result[data-band="chronic"] .arc-band-dot { background: var(--danger); }
.arc-result[data-band="chronic"] .arc-band-label { color: var(--danger-soft-fg); }

/* ---------- Detail list ---------- */
.arc-detail {
  margin: 0;
  display: grid;
  gap: var(--space-2);
}
.arc-detail-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3);
  align-items: baseline;
  padding: 6px 0;
}
.arc-detail-row + .arc-detail-row {
  border-top: 1px dashed var(--border);
}
.arc-detail dt {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}
.arc-detail dd {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.arc-detail-row[hidden] { display: none; }

/* ---------- Actions ---------- */
.arc-actions {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3);
  margin-top: var(--space-5);
}
@media (max-width: 420px) {
  .arc-actions { grid-template-columns: 1fr; }
}
.arc-actions .btn { min-height: 44px; }