.gstep-layout {
  display: grid;
  gap: 24px;
}

.gstep-card-stack {
  display: grid;
  gap: 16px;
}

@media (min-width: 1024px) {
  .gstep-layout {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    align-items: start;
  }
}

.gstep-primary {
  display: grid;
  gap: 24px;
}

.gstep-mode-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.gstep-mode-group label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 999px;
  cursor: pointer;
  background: var(--surface-default, #ffffff);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.04);
}

.gstep-mode-group input[type='radio'] {
  margin: 0;
}

.gstep-mode-group label.is-active {
  background: var(--accent-50, #e7f5ff);
  border-color: var(--accent-300, #74c0fc);
  color: var(--accent-900, #0b7285);
}

.gstep-section {
  display: grid;
  gap: 12px;
}

.gstep-section textarea,
.gstep-section input[type='text'],
.gstep-section input[type='number'] {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border, #d0d7de);
  font-size: 1rem;
  min-height: 48px;
}

.gstep-section input.is-invalid,
.gstep-section textarea.is-invalid {
  border-color: var(--danger, #d92d20);
  box-shadow: 0 0 0 3px rgba(217, 45, 32, 0.12);
}

.gstep-section textarea {
  resize: vertical;
  min-height: 120px;
}

.gstep-hint {
  font-size: 0.85rem;
  color: var(--text-muted, #666666);
}

.gstep-inline-error {
  margin: 4px 0 0;
  font-size: 0.9rem;
  color: var(--danger, #b42318);
}

.gstep-inline-inputs {
  display: grid;
  gap: 12px;
}

@media (min-width: 640px) {
  .gstep-inline-inputs {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
}

.gstep-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.gstep-actions .button.primary {
  flex: 1 1 220px;
  min-height: 52px;
}

.gstep-actions .button {
  min-width: 150px;
  justify-content: center;
}

.gstep-results {
  display: grid;
  gap: 16px;
}

.gstep-result-grid {
  display: grid;
  gap: 12px;
}

.gstep-result-grid > .gstep-result-item {
  display: grid;
  gap: 4px;
}

.gstep-result-label {
  font-size: 0.85rem;
  color: var(--text-muted, #5c677d);
}

.gstep-result-value {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace);
  font-size: 1.1rem;
  word-break: break-all;
}

.gstep-hero {
  background: linear-gradient(135deg, #e8f3ff 0%, #f6fafe 100%);
  border: 1px solid var(--border, #d0d7de);
  border-radius: 14px;
  padding: 16px;
  display: grid;
  gap: 12px;
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.08);
}

.gstep-hero-title {
  font-size: 0.95rem;
  color: var(--text-muted, #475569);
  letter-spacing: 0.01em;
}

.gstep-hero-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 640px) {
  .gstep-hero-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }
}

.gstep-hero-block {
  background: #ffffff;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 12px;
  padding: 12px;
  display: grid;
  gap: 4px;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.06);
}

.gstep-hero-label {
  font-size: 0.85rem;
  color: var(--text-muted, #5c677d);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.gstep-hero-value {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace);
  font-size: 2.25rem;
  line-height: 1.1;
  word-break: break-word;
}

.gstep-hero-note {
  font-size: 0.9rem;
  color: var(--text-muted, #6b7280);
}

.gstep-steps-card {
  position: relative;
  display: grid;
  gap: 16px;
}

@media (min-width: 1024px) {
  .gstep-steps-card {
    position: sticky;
    top: 20px;
  }
}

.steps-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
}

.steps-list li {
  line-height: 1.4;
}

.steps-list ol {
  margin-top: 6px;
  padding-left: 20px;
}

.steps-list li {
  background: #f9fafb;
  border: 1px solid var(--border, #d0d7de);
  border-radius: 10px;
  padding: 10px 12px;
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.03);
}

.steps-list code {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace);
}

.teacher-notes {
  display: grid;
  gap: 8px;
  margin: 12px 0 0;
  padding-left: 20px;
}

.teacher-notes li {
  line-height: 1.4;
}

.gstep-muted {
  font-size: 0.85rem;
  color: var(--text-muted, #6b7280);
}

.gstep-math {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace);
  font-size: 0.95rem;
  word-break: break-word;
}

.gstep-math-render {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace);
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.gstep-math-raw {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace);
  font-size: 0.92rem;
  color: var(--text-muted, #6b7280);
}

.chip-input {
  border: 1px solid var(--border, #d0d7de);
  border-radius: 12px;
  padding: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  background: var(--surface-default, #ffffff);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.chip-input:focus-within {
  border-color: var(--accent-400, #4dabf7);
  box-shadow: 0 0 0 4px rgba(77, 171, 247, 0.18);
}

.chip-input.is-disabled {
  opacity: 0.55;
  pointer-events: none;
}

.chip-input.is-invalid {
  border-color: var(--danger, #d92d20);
  background: #fff5f2;
  box-shadow: 0 0 0 3px rgba(217, 45, 32, 0.12);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent-50, #e7f5ff);
  color: var(--accent-900, #0b7285);
  font-weight: 600;
  box-shadow: inset 0 0 0 1px var(--accent-200, #a5d8ff);
}

.chip-remove {
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
  padding: 0;
}

.chip-entry {
  min-width: 140px;
  flex: 1 1 140px;
  border: none;
  outline: none;
  font-size: 1rem;
  padding: 6px 4px;
  background: transparent;
}

.gstep-process-tabs {
  display: grid;
  gap: 12px;
}

.gstep-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.gstep-tablist button {
  border: 1px solid var(--border, #d0d7de);
  background: #f8fafc;
  color: var(--text-default, #0f172a);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.gstep-tablist button.is-active {
  background: var(--accent-50, #e7f5ff);
  border-color: var(--accent-300, #74c0fc);
  color: var(--accent-900, #0b7285);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.08);
}

.gstep-tablist button[disabled],
.gstep-tablist button.is-disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.gstep-tab-panels {
  border: 1px solid var(--border, #d0d7de);
  border-radius: 12px;
  padding: 12px;
  background: #ffffff;
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.05);
}

.gstep-tab-panel[hidden] {
  display: none;
}

.ladder-legend {
  font-size: 0.9rem;
  color: var(--text-muted, #64748b);
  margin-bottom: 8px;
}

.ladder-grid {
  display: grid;
  gap: 8px;
}

.ladder-row {
  display: grid;
  gap: 8px;
  align-items: center;
  padding: 8px;
  border-bottom: 1px dashed var(--border, #d0d7de);
}

.ladder-row:last-child {
  border-bottom: none;
}

.ladder-row.is-start {
  background: #f8fafc;
  border: 1px dashed var(--border, #d0d7de);
  border-radius: 10px;
}

.ladder-row.is-gcd .ladder-prime {
  color: var(--accent-900, #0b7285);
}

.ladder-prime {
  font-weight: 700;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.ladder-number {
  padding: 8px 10px;
  border-radius: 10px;
  background: #f1f5f9;
  text-align: center;
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, SFMono, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace);
}

.ladder-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-100, #d0ebff);
  color: var(--accent-900, #0b7285);
  font-size: 0.75rem;
  font-weight: 600;
}