:root {
  --body-bg: #eff3f9;
  --surface-bg: #ffffff;
  --surface-alt: #f4f6fc;
  --border: rgba(15, 23, 42, 0.08);
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --text-primary: #111827;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #22c55e;
  --success-hover: #16a34a;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --transition: 180ms ease;
}

* {
  box-sizing: border-box;
}

html, body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--body-bg);
  background-image: radial-gradient(circle at 20% 20%, rgba(37, 99, 235, 0.1), transparent 45%),
    radial-gradient(circle at 80% 0%, rgba(14, 165, 233, 0.15), transparent 50%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(239, 243, 249, 0.9));
  -webkit-font-smoothing: antialiased;
}

.hidden {
  display: none !important;
}

.container {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: clamp(24px, 4vw, 48px) clamp(16px, 4vw, 32px);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: clamp(24px, 4vw, 40px);
}

.auth-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 16px;
}

.auth-card {
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: clamp(28px, 5vw, 40px);
  width: min(420px, 100%);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.auth-form label {
  font-weight: 600;
  color: var(--text-primary);
}

.auth-form input {
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
  background: #ffffff;
}

.auth-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.auth-error {
  border-radius: var(--radius-sm);
  background: rgba(239, 68, 68, 0.12);
  color: var(--danger);
  padding: 10px 12px;
  font-weight: 600;
}

.header-row {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.auth-chip {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.btn.small {
  padding: 6px 12px;
  font-size: 14px;
}

.app-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}

.global-search-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.global-search-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.global-search-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.global-search-controls input[type="search"] {
  flex: 1 1 260px;
  min-width: min(280px, 100%);
}

.global-search-results {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 360px;
  overflow: auto;
  padding-right: 4px;
}

.global-search-results.hidden {
  display: none;
}

.global-search-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: var(--surface-alt);
}

.global-search-item-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.global-search-item-title {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  font-weight: 600;
}

.global-search-item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.85rem;
}
    
.sort-btn {
  padding: 6px 12px;
  font-size: 0.9rem;
  background: rgba(37, 99, 235, 0.08);
  border-color: transparent;
}

.sort-btn:hover {
  background: rgba(37, 99, 235, 0.16);
}

.global-search-snippet {
  font-size: 0.92rem;
  color: var(--text-primary);
}

.global-search-snippet mark {
  background: rgba(37, 99, 235, 0.25);
  color: inherit;
  border-radius: 4px;
  padding: 0 2px;
}

.global-search-actions {
  display: flex;
  justify-content: flex-end;
}

.global-search-empty {
  padding: 20px;
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.03);
  text-align: center;
  color: var(--text-secondary);
}

.app-header .title {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  margin: 0;
}

.muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.section-title {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.deck-heading {
  flex-wrap: wrap;
  gap: 12px;
}

.deck-heading-names {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.deck-actions-row {
  flex-wrap: wrap;
  justify-content: flex-start;
}

.deck-course-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.06);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
}

.deck-group-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
}

.deck-subsection-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(34, 197, 94, 0.12);
  color: var(--success);
  font-weight: 600;
  font-size: 0.85rem;
  margin-left: 6px;
}

.section-title .row {
  flex-wrap: wrap;
}

.title {
  margin: 0;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
}

.view {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 4vw, 32px);
}

.card {
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: clamp(20px, 4vw, 28px);
  box-shadow: var(--shadow);
}

.card.two {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.grid {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.grid.decks {
  flex-direction: column;
  flex-wrap: wrap;
  gap: 20px;
}

.grid.decks > * {
  flex: 1 1 260px;
  min-width: min(320px, 100%);
}

.card-item {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: flex-start;
}

.card-item-sides {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1 1 260px;
}

.card-side-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.card-side-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.face-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
}

.card-item-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-face-image {
  width: 100%;
  max-height: 180px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(15, 23, 42, 0.1);
  background: #ffffff;
}

.card-text-block {
  margin: 0;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(15, 23, 42, 0.04);
  color: var(--text-primary);
  white-space: pre-wrap;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.5;
  overflow-x: auto;
}

.card-text-block.is-code {
  font-family: "SFMono-Regular", "Fira Code", Consolas, "Roboto Mono", monospace;
  background: rgba(15, 23, 42, 0.08);
}

.card.is-card-focus {
  border-color: rgba(37, 99, 235, 0.5);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

.course-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: clamp(20px, 3vw, 28px);
}

.course-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.course-card-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.course-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-start;
  margin-top: -4px;
}

.course-delete-btn {
  border: none;
  background: rgba(239, 68, 68, 0.14);
  color: var(--danger);
  border-radius: 12px;
  padding: 10px;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.course-delete-btn:hover {
  background: rgba(239, 68, 68, 0.24);
  transform: translateY(-1px);
}

.course-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.course-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.course-decks {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.course-decks .empty-hint {
  margin: 0;
  padding: 16px;
}

.dialog-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 4vw, 40px);
  background: rgba(15, 23, 42, 0.55);
  z-index: 1000;
}

.dialog-panel {
  width: min(420px, 100%);
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.2);
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: clamp(20px, 4vw, 28px);
  max-height: min(520px, 90vh);
  overflow: auto;
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.dialog-title {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
}

.dialog-close {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  line-height: 1;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.dialog-close:hover {
  background: rgba(15, 23, 42, 0.06);
  color: var(--text-primary);
}

.dialog-body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dialog-message {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.dialog-input {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dialog-input-label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.dialog-input input.is-invalid {
  border-color: rgba(239, 68, 68, 0.6);
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.15);
}

.dialog-custom {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 12px;
}

.dialog-option-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dialog-option {
  display: flex;
  width: 100%;
  text-align: left;
  background: var(--surface-alt);
  border: 1px solid rgba(15, 23, 42, 0.1);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  gap: 8px;
  align-items: center;
  appearance: none;
  font: inherit;
}

.dialog-option:hover,
.dialog-option.is-active {
  background: rgba(37, 99, 235, 0.1);
  border-color: rgba(37, 99, 235, 0.2);
  transform: translateY(-1px);
}

.dialog-option-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.dialog-option-title {
  font-weight: 600;
  color: var(--text-primary);
}

.dialog-option-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.dialog-overlay.hidden {
  display: none;
}

.deck-list-item {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.deck-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.deck-item-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.deck-item-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.deck-group-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-lite {
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-md);
  border: 1px solid rgba(15, 23, 42, 0.08);
  padding: 16px;
}

.deck-subsections-block {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 10px;
}

.deck-subsections-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.deck-subsections-title {
  font-weight: 600;
  color: var(--text-primary);
}

.deck-subsections-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.deck-subsection-card {
  background: var(--surface-bg);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.deck-subsection-card .deck-subitem {
  background: var(--surface-alt);
}

.deck-subsection-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.deck-subsection-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

.deck-subsection-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.deck-subsection-actions .btn {
  padding: 6px 12px;
}

.deck-subsection-groups {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.deck-subitem-compact {
  padding: 10px 14px;
}

.card-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.card-list-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.card-list-controls input {
  flex: 1 1 220px;
  max-width: 320px;
}

.card-list-collapsible {
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: max-height var(--transition), opacity var(--transition);
}

.card-list-collapsible.hidden {
  display: none;
}

.deck-item-toggle {
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: var(--surface-alt);
  color: var(--text-primary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.deck-item-toggle:hover {
  background: #e2e8f8;
}

.deck-item-toggle .chevron {
  width: 10px;
  height: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--transition);
}

.deck-item-toggle.expanded .chevron {
  transform: rotate(-135deg);
}

.deck-sublist {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.deck-subitem {
  appearance: none;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: var(--surface-alt);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  text-align: left;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.deck-subitem:hover {
  background: rgba(37, 99, 235, 0.08);
  border-color: rgba(37, 99, 235, 0.24);
  transform: translateY(-1px);
}

.deck-subitem-main {
  display: flex;
  align-items: center;
  gap: 12px;
}

.deck-subitem-icon {
  font-size: 1.4rem;
}

.deck-subitem-copy {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.deck-subitem-title {
  font-weight: 600;
  color: var(--text-primary);
}

.deck-subitem-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.deck-subitem-count {
  font-weight: 600;
  color: var(--text-primary);
  min-width: 32px;
  text-align: right;
}

.empty-hint {
  padding: 24px;
  text-align: center;
  border: 1px dashed rgba(15, 23, 42, 0.12);
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.03);
}

.unassigned-card {
  border-style: dashed;
  background: rgba(37, 99, 235, 0.04);
}

.row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.row.end {
  justify-content: flex-end;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  background: var(--surface-alt);
  color: var(--text-primary);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn:hover {
  background: #e2e8f8;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.btn.primary:hover {
  background: var(--primary-hover);
}

.btn.danger {
  background: rgba(239, 68, 68, 0.14);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.24);
}

.btn.danger:hover {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger-hover);
}

.btn.pill {
  border-radius: 999px;
}

.btn.good {
  background: rgba(34, 197, 94, 0.14);
  color: var(--success);
  border-color: rgba(34, 197, 94, 0.24);
}

.btn.good:hover {
  background: rgba(34, 197, 94, 0.2);
  color: var(--success-hover);
}

.btn.bad {
  background: rgba(239, 68, 68, 0.14);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.24);
}

.btn.bad:hover {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger-hover);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

input[type="text"],
input[type="search"],
textarea {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: var(--surface-alt);
  color: var(--text-primary);
  padding: 12px 16px;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

input[type="text"]:focus,
input[type="search"]:focus,
textarea:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
  background: #fff;
}

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

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 12px;
}

.deck-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.paste-zone {
  border: 1.5px dashed rgba(37, 99, 235, 0.3);
  border-radius: var(--radius-md);
  background: rgba(37, 99, 235, 0.06);
  padding: 20px;
  color: var(--text-secondary);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: border-color var(--transition), background var(--transition);
}

.image-file-input {
  display: none;
}

.paste-zone:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.6);
  background: rgba(37, 99, 235, 0.12);
}

.preview {
  margin-top: 14px;
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.03);
  padding: 10px;
}

.preview img {
  width: 100%;
  max-height: 320px;
  object-fit: contain;
  border-radius: var(--radius-md);
  display: block;
}

.side-toggle {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border-radius: 999px;
  background: var(--surface-alt);
  border: 1px solid rgba(15, 23, 42, 0.08);
  margin-bottom: 14px;
}

.side-toggle .seg {
  border: none;
  background: transparent;
  padding: 8px 18px;
  border-radius: 999px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.side-toggle .seg.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 10px 18px rgba(37, 99, 235, 0.12);
}

.side-toggle .seg:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

#viewLearn #learnDeckTitle {
  display: none;
}

.learn-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: clamp(24px, 6vw, 40px);
  box-shadow: var(--shadow);
}

.learn-face {
  width: 100%;
  min-height: clamp(180px, 40vh, 360px);
  background: var(--surface-alt);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(15, 23, 42, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(20px, 4vw, 32px);
  font-size: clamp(18px, 2.8vw, 24px);
  text-align: center;
  color: var(--text-primary);
}

.learn-face img {
  max-width: min(100%, 460px);
  max-height: clamp(200px, 40vh, 420px);
  border-radius: var(--radius-md);
  object-fit: contain;
}

.learn-face-content {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: center;
  width: 100%;
}

.learn-face-text {
  white-space: pre-wrap;
}

.learn-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.learn-progress {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.grid#cards {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 20px;
}

#cards .card {
  flex: 1 1 260px;
  min-width: min(320px, 100%);
  padding: 18px;
  border-radius: var(--radius-md);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.06);
}

.learn-face .card-text-block {
  width: 100%;
}

#cards .card strong {
  display: inline-block;
  margin-bottom: 6px;
}

#cards .muted {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

#cards .row {
  justify-content: space-between;
}

#cards .row .btn {
  padding-inline: 12px;
}

.learn-face div {
  max-width: 100%;
  word-break: break-word;
}

.learn-face div:not(:last-child) {
  margin-bottom: 0;
}

.learn-face p {
  margin: 0;
}

.learn-progress,
#learnProgress {
  color: var(--text-secondary);
}

@media (min-width: 600px) {
  .app-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .section-title {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .deck-heading-names {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
  }

  .card.two {
    flex-direction: row;
    align-items: flex-start;
  }

  .card.two > * {
    flex: 1 1 0;
  }

  .learn-actions {
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .container {
    gap: 48px;
  }

  .app-header .title {
    font-size: 36px;
  }

  .learn-face {
    min-height: clamp(280px, 45vh, 460px);
  }
}

@media (max-width: 480px) {
  .btn {
    width: 100%;
    justify-content: center;
  }

  .section-title .row {
    width: 100%;
    justify-content: center;
  }

  .learn-actions .btn {
    flex: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}