.brand {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

.brand-mark {
  width: 80px;
  height: 80px;
}

.brand-eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.brand-subtitle {
  margin: var(--space-2) 0 0;
  color: var(--color-text-secondary);
  font-size: 14px;
}

h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 32px;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
}

.header-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.header-link:hover {
  color: var(--color-text-primary);
}

.input-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.message-input {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  background: var(--color-bg-input);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  width: 100%;
  min-height: 140px;
  resize: vertical;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.message-input:focus {
  outline: none;
  border-color: var(--color-interactive);
  box-shadow: 0 0 0 3px var(--color-interactive-weak);
}

.input-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.meta-value {
  color: var(--color-text-code);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.control-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.select-control {
  background: var(--color-bg-input);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
}

.select-control:focus {
  outline: none;
  border-color: var(--color-interactive);
  box-shadow: 0 0 0 3px var(--color-interactive-weak);
}

.toggle-group {
  display: inline-flex;
  gap: var(--space-1);
  padding: var(--space-1);
  border-radius: var(--radius-md);
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
}

.toggle-option {
  position: relative;
  font-family: var(--font-body);
  font-size: 13px;
}

.toggle-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-option span {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: color 0.15s ease, background 0.15s ease;
}

.toggle-option input:checked + span {
  color: var(--color-text-primary);
  background: var(--color-interactive-weak);
}

.toggle-option input:focus-visible + span {
  outline: 2px solid var(--color-interactive);
  outline-offset: 2px;
}

.calculator-header p {
  margin: var(--space-2) 0 0;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.stats-bar {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  flex-wrap: wrap;
  padding: var(--space-2) 0 var(--space-4);
}

.stat-chip {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 120px;
}

.stat-label {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.stat-value.is-multi {
  color: var(--color-warning);
}

.stat-value.is-low {
  color: var(--color-warning);
}

.encoding-badge {
  border: 1px solid var(--color-border-strong);
}

.encoding-badge .stat-value {
  color: currentColor;
}

.encoding-badge .stat-label {
  color: currentColor;
  opacity: 0.75;
}

.encoding-badge[data-encoding="gsm7"] {
  color: var(--color-gsm7);
  border-color: var(--color-gsm7);
}

.encoding-badge[data-encoding="unicode"] {
  color: var(--color-unicode);
  border-color: var(--color-unicode);
}

.encoding-badge[data-encoding="rcs"] {
  color: var(--color-rcs);
  border-color: var(--color-rcs);
}

.segment-tape-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.segment-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.segment-bar {
  height: 24px;
  background: var(--color-segment-empty);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.segment-bar::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 1px;
  height: 100%;
  background: var(--color-segment-boundary);
  opacity: 0.7;
}

.segment-fill {
  height: 100%;
  background: var(--color-segment-filled);
  border-radius: var(--radius-sm);
  transition: width 0.1s ease;
}

.segment-fill.near-full {
  background: var(--color-warning);
}

.segment-fill.full {
  background: var(--color-error);
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.segment-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.encoding-details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.encoding-details summary {
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-surface);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.encoding-details summary::-webkit-details-marker {
  display: none;
}

.encoding-details[open] summary {
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.details-body {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.details-body p {
  margin: 0;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.detail-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.detail-value {
  font-family: var(--font-mono);
  color: var(--color-text-primary);
}

.detail-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.detail-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-primary);
}

.detail-table th,
.detail-table td {
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-2) 0;
}

.detail-warning {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-bg-surface-raised);
  border: 1px solid var(--color-error);
  color: var(--color-error);
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.calculator-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-surface);
}

.calculator-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.calculator-toggle::-webkit-details-marker {
  display: none;
}

.calculator-toggle h2 {
  margin: 0;
  font-size: 22px;
}

.calculator-desc {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.toggle-indicator {
  margin-left: auto;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  position: relative;
}

.toggle-indicator::before,
.toggle-indicator::after {
  content: '';
  position: absolute;
  background: var(--color-text-secondary);
  border-radius: 1px;
  transition: transform 0.2s ease;
}

.toggle-indicator::before {
  top: 50%;
  left: 3px;
  right: 3px;
  height: 2px;
  transform: translateY(-50%);
}

.toggle-indicator::after {
  left: 50%;
  top: 3px;
  bottom: 3px;
  width: 2px;
  transform: translateX(-50%);
}

.calculator-section[open] > .calculator-toggle .toggle-indicator::after {
  transform: translateX(-50%) rotate(90deg);
  opacity: 0;
}

.calculator-toggle:hover .toggle-indicator::before,
.calculator-toggle:hover .toggle-indicator::after {
  background: var(--color-text-primary);
}

.calculator-body {
  padding: 0 var(--space-5) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}