:root {
  color-scheme: light;
  --bg: #f7f8fd;
  --surface: #ffffff;
  --surface-alt: #f7f8fd;
  --surface-soft: #f1f4ff;
  --line: #edf0fb;
  --text: #2e3650;
  --muted: #8892af;
  --primary: #4f5dff;
  --primary-soft: #cfd5ff;
  --cyan: #46c4ff;
  --green: #2abf88;
  --red: #ff7d73;
  --shadow: 0 22px 52px rgba(93, 104, 158, 0.08);
  --shadow-soft: 0 12px 30px rgba(93, 104, 158, 0.06);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 18px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Avenir Next", Avenir, "SF Pro Display", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(79, 93, 255, 0.05), transparent 22%),
    linear-gradient(180deg, #fbfbff 0%, #f6f8ff 100%);
}

body[data-page="flashcards"],
body[data-page="learn"] {
  height: 100dvh;
  overflow: hidden;
}

.hidden {
  display: none !important;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

.app-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 14px 0 28px;
}

.topbar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 24px;
  padding: 10px 0 22px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  justify-self: end;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  place-items: center;
  position: relative;
  width: 46px;
  height: 46px;
  border-radius: 16px;
  background: linear-gradient(180deg, #f4f6ff, #edf1ff);
  border: 1px solid #e2e8fb;
  box-shadow: 0 8px 20px rgba(79, 93, 255, 0.08);
  color: transparent;
  font-size: 0;
  overflow: hidden;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  border-radius: 11px;
}

.brand-mark::before {
  width: 19px;
  height: 19px;
  left: 10px;
  top: 11px;
  background: linear-gradient(135deg, #4f5dff, #6775ff);
  box-shadow: 0 8px 18px rgba(79, 93, 255, 0.18);
}

.brand-mark::after {
  width: 19px;
  height: 19px;
  right: 9px;
  bottom: 9px;
  background: linear-gradient(135deg, #42c1ff, #6cd1ff);
  opacity: 0.92;
}

.add-set-button {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: var(--primary);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #dfe5f8;
  box-shadow: 0 8px 18px rgba(79, 93, 255, 0.08);
  font-size: 1.55rem;
  font-weight: 500;
  line-height: 1;
  position: relative;
}

.add-set-button-with-hint::after {
  content: attr(data-tooltip);
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%) translateX(4px);
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(47, 56, 87, 0.94);
  color: white;
  font-size: 0.84rem;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}

.add-set-button-with-hint:hover::after,
.add-set-button-with-hint:focus-visible::after {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.content-shell {
  display: grid;
  gap: 18px;
}

.library-page {
  gap: 22px;
}

.surface {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.deck-header,
.study-top,
.progress-summary,
.import-card,
.overview-card,
.table-section,
.question-panel,
.flashcard-stage,
.preview-card {
  padding: 22px;
}

.deck-header,
.study-top {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
}

.deck-meta {
  display: grid;
  gap: 8px;
}

.deck-header.compact {
  padding-bottom: 24px;
}

.deck-header-minimal {
  display: block;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.deck-title-compact {
  max-width: 24ch;
  margin: 0;
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  line-height: 1.08;
  word-break: break-word;
}

.crumb,
.section-label,
.card-language,
.hint-row,
.flash-stats,
th {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
  font-weight: 600;
}

h1,
h2 {
  margin: 6px 0 0;
  font-size: clamp(1.45rem, 2.6vw, 2.3rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

h2 {
  font-size: 1.28rem;
  font-weight: 700;
}

.deck-subtitle,
.mode-tile p,
.status-text,
.review-answer,
.empty-row {
  color: var(--muted);
}

.deck-subtitle {
  margin: 4px 0 0;
  max-width: 52ch;
  font-size: 0.98rem;
  line-height: 1.45;
}

.deck-actions,
.import-actions,
.inline-actions,
.review-scale,
.response-actions,
.page-links,
.library-toolbar,
.library-toolbar-actions,
.tag-row,
.deck-inline-metrics {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.deck-name-input {
  width: 100%;
  margin-top: 8px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fbfcff;
}

.field-label {
  display: block;
  margin: 14px 0 8px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.delimiter-select {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fbfcff;
  color: var(--text);
  font-family: "Avenir Next", Avenir, "SF Pro Display", "Segoe UI", sans-serif;
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.2;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

.language-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.library-toolbar {
  justify-content: space-between;
  align-items: center;
}

.library-title {
  margin: 0;
  font-size: clamp(1.65rem, 3vw, 2.3rem);
}

.library-list {
  display: grid;
  gap: 14px;
}

.auth-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 24px;
  align-items: start;
  padding: 22px;
}

.auth-panel-title {
  margin: 6px 0 8px;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.auth-panel-copy .section-label {
  margin: 0;
}

.auth-status,
.library-status {
  margin: 10px 0 0;
}

.auth-panel-form {
  width: 100%;
}

.auth-actions {
  margin-top: 18px;
}

.admin-panel {
  display: grid;
  gap: 18px;
  padding: 22px;
}

.admin-status {
  margin: 0;
}

.admin-grid {
  align-items: start;
}

.admin-users-wrap {
  max-height: 420px;
}

.admin-user-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.library-status {
  margin: -6px 0 0;
}

.library-toolbar-actions {
  justify-content: flex-end;
}

.icon-tool-button {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 50%;
  flex: 0 0 44px;
}

.icon-tool-button svg {
  width: 27px;
  height: 27px;
}

.icon-tool-button svg * {
  stroke-width: 2.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.primary-tool-button {
  color: var(--primary);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #dfe5f8;
  box-shadow: 0 8px 18px rgba(79, 93, 255, 0.08);
  min-width: 44px;
  min-height: 44px;
}

.deck-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 18px;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.deck-row:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px rgba(93, 104, 158, 0.08);
  border-color: #e4e9fb;
}

.deck-row-main {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  min-width: 0;
}

.deck-row-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(180deg, #e4f7ff, #edf8ff);
  position: relative;
}

.deck-row-icon::before,
.deck-row-icon::after {
  content: "";
  position: absolute;
  border-radius: 4px;
  border: 3px solid #1798df;
}

.deck-row-icon::before {
  width: 16px;
  height: 24px;
  left: 18px;
  top: 12px;
  transform: rotate(-18deg);
}

.deck-row-icon::after {
  width: 16px;
  height: 24px;
  left: 24px;
  top: 8px;
  transform: rotate(-18deg);
  opacity: 0.45;
}

.deck-row-copy strong {
  display: block;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.deck-row-copy p {
  margin: 4px 0 0;
  color: var(--muted);
  font-weight: 500;
}

.deck-row-actions {
  display: block;
  color: #6d7898;
  font-size: 1.24rem;
  line-height: 1;
  font-weight: 600;
  letter-spacing: 0.06em;
  transform: translateY(-0.5px);
  opacity: 0.78;
}

.deck-row-menu-button {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fbfcff;
  color: #6d7898;
  font-weight: 700;
  box-shadow: 0 8px 18px rgba(93, 104, 158, 0.05);
}

.deck-row-menu-button:hover {
  transform: translateY(-1px);
}

.settings-info-list {
  display: grid;
  gap: 12px;
}

.empty-library {
  padding: 22px;
  color: var(--muted);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(31, 40, 77, 0.34);
  backdrop-filter: blur(10px);
  z-index: 20;
}

.modal-card {
  width: min(1080px, 100%);
  padding: 24px;
}

.modal-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 18px;
}

.modal-form,
.preview-panel {
  min-width: 0;
}

.preview-panel {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #fcfcff, #f8f9ff);
}

.preview-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.preview-table-wrap {
  max-height: 420px;
}

.modal-actions {
  margin-top: 16px;
}

.pill-button,
.ghost-button,
.solid-button,
.success-button,
.danger-button,
.round-action,
.choice-button,
.inline-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 11px 16px;
  font-weight: 600;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.compact-button {
  padding: 9px 14px;
  font-size: 0.95rem;
}

.pill-button,
.ghost-button,
.choice-button,
.inline-link {
  border: 1px solid var(--line);
  background: #f8f9ff;
}

.pill-button.active,
.solid-button {
  color: white;
  background: linear-gradient(135deg, var(--primary), #6876ff);
  box-shadow: 0 12px 24px rgba(79, 93, 255, 0.16);
}

.success-button {
  color: white;
  background: linear-gradient(135deg, var(--green), #21aa78);
}

.danger-button {
  color: white;
  background: linear-gradient(135deg, var(--red), #ff6f6f);
}

.pill-button:hover,
.ghost-button:hover,
.solid-button:hover,
.success-button:hover,
.danger-button:hover,
.round-action:hover,
.choice-button:hover,
.upload-button:hover,
.mode-tile:hover {
  transform: translateY(-1px);
}

.upload-button input {
  display: none;
}

.mode-grid,
.study-mode-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.study-mode-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mode-tile {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: linear-gradient(180deg, #fbfcff, #f7f8fd);
}

.mode-tile.active {
  outline: 2px solid rgba(79, 93, 255, 0.16);
}

.mode-tile strong {
  display: block;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.mode-tile p {
  margin: 4px 0 0;
  font-size: 0.92rem;
  line-height: 1.38;
  font-weight: 500;
}

.mode-icon {
  position: relative;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
}

.mode-icon.stack::before,
.mode-icon.stack::after,
.mode-icon.ring::before,
.mode-icon.rocket::before,
.mode-icon.grid::before {
  content: "";
  position: absolute;
}

.mode-icon.stack::before {
  inset: 7px 4px 3px 12px;
  border-radius: 10px;
  background: linear-gradient(135deg, #42c1ff, #6cd1ff);
  box-shadow: 0 8px 18px rgba(66, 193, 255, 0.16);
}

.mode-icon.stack::after {
  inset: 1px 10px 10px 1px;
  border-radius: 10px;
  background: linear-gradient(135deg, #4f5dff, #6775ff);
  box-shadow: 0 10px 20px rgba(79, 93, 255, 0.18);
}

.mode-icon.ring::before {
  inset: 4px;
  border: 5px solid var(--primary);
  border-right-color: var(--cyan);
  border-bottom-color: var(--cyan);
  border-radius: 50%;
}

.mode-icon.rocket::before {
  inset: 3px 10px;
  border-radius: 16px 16px 16px 4px;
  transform: rotate(35deg);
  background: linear-gradient(135deg, var(--cyan), var(--primary));
}

.mode-icon.grid::before {
  inset: 4px;
  background:
    linear-gradient(var(--primary), var(--primary)) 0 0 / 10px 10px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) 14px 0 / 10px 10px no-repeat,
    linear-gradient(var(--primary), var(--primary)) 28px 0 / 10px 10px no-repeat,
    linear-gradient(var(--primary), var(--primary)) 0 14px / 10px 10px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) 14px 14px / 10px 10px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) 28px 14px / 10px 10px no-repeat,
    linear-gradient(var(--primary), var(--primary)) 0 28px / 10px 10px no-repeat,
    linear-gradient(var(--primary), var(--primary)) 14px 28px / 10px 10px no-repeat,
    linear-gradient(var(--cyan), var(--cyan)) 28px 28px / 10px 10px no-repeat;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 18px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 14px;
}

textarea {
  width: 100%;
  min-height: 154px;
  margin-top: 8px;
  resize: vertical;
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fbfcff;
}

.status-text {
  margin: 0;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.metric-block {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #fcfcff, #f8f9fd);
}

.metric-block span {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 600;
}

.metric-block strong {
  display: block;
  margin-top: 6px;
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.active-deck-box {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--surface-soft), #f6f8ff);
}

.text-link {
  color: var(--primary);
  font-weight: 700;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.list-cell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.mini-speak-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fbfcff;
  color: #61719d;
  box-shadow: 0 6px 14px rgba(93, 104, 158, 0.05);
}

.mini-speak-button svg {
  width: 15px;
  height: 15px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: white;
}

th,
td {
  padding: 13px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

tbody tr:last-child td {
  border-bottom: 0;
}

.empty-row {
  text-align: center;
  padding: 28px;
}

.page-links {
  justify-content: flex-end;
}

.page-links a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 700;
}

.page-links a.active {
  color: var(--primary);
  background: #eef1ff;
}

.study-page {
  gap: 14px;
}

body[data-page="flashcards"] .app-shell,
body[data-page="learn"] .app-shell {
  min-height: 100dvh;
  height: 100dvh;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
}

.flashcard-page-clean {
  gap: 12px;
  min-height: 0;
  height: 100%;
  grid-template-rows: auto auto auto auto minmax(0, 1fr) auto;
}

.learn-page-clean {
  gap: 12px;
  min-height: 0;
  height: 100%;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
}

.learn-progress-line {
  margin-top: -2px;
}

.study-header-simple {
  display: flex;
  align-items: center;
  padding: 6px 0 8px;
  justify-content: flex-start;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #657093;
  font-weight: 600;
  padding: 8px 0;
}

.flashcard-clean-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 18px;
}

.flashcard-clean-mode {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.98rem;
  font-weight: 500;
  justify-self: start;
  font-family: "Avenir Next", Avenir, "SF Pro Display", "Segoe UI", sans-serif;
  color: #5f6989;
}

.flashcard-clean-center {
  display: grid;
  justify-items: center;
  gap: 0;
}

.flashcard-clean-center strong {
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.flashcard-clean-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-content: flex-end;
  justify-self: end;
}

.learn-clean-top {
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
}

.learn-top-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-self: end;
}

.audio-control-group {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: end;
  gap: 10px;
  min-width: 0;
}

.settings-modal-card {
  width: min(720px, 100%);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.settings-grid-single {
  grid-template-columns: minmax(0, 1fr);
}

.settings-block {
  display: grid;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #fcfcff, #f8f9fd);
}

.settings-toggle {
  justify-content: flex-start;
}

.settings-voice-picker {
  gap: 6px;
}

.settings-progress-toggle {
  justify-content: flex-start;
}

.settings-footer {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  color: #647096;
  font-size: 1.15rem;
  box-shadow: 0 8px 18px rgba(93, 104, 158, 0.06);
}

.icon-button svg {
  width: 20px;
  height: 20px;
}

.flashcard-progress-line {
  width: 100%;
  height: 3px;
  border-radius: 999px;
  background: #e3e7fb;
  overflow: hidden;
}

.flashcard-progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--primary), #7b88ff);
}

.flashcard-score-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.score-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  font-family: "Avenir Next", Avenir, "SF Pro Display", "Segoe UI", sans-serif;
  letter-spacing: -0.01em;
}

.score-pill strong {
  font-weight: 500;
}

.score-pill span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
}

.score-pill-warm {
  color: #d46a1f;
}

.score-pill-warm span {
  background: rgba(250, 164, 92, 0.14);
  border: 1px solid rgba(250, 164, 92, 0.4);
}

.score-pill-cool {
  color: #22a26f;
}

.score-pill-cool span {
  background: rgba(42, 191, 136, 0.12);
  border: 1px solid rgba(42, 191, 136, 0.35);
}

.flashcard-stage {
  padding: 0;
  overflow: hidden;
  min-height: 0;
}

.flashcard-stage-clean {
  box-shadow: 0 20px 48px rgba(83, 94, 168, 0.09);
}

.hint-row {
  display: inline-flex;
  justify-content: flex-start;
  gap: 12px;
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 800;
}

.flashcard-shell {
  position: relative;
  width: 100%;
  min-height: clamp(320px, calc(100dvh - 440px), 520px);
  height: clamp(320px, calc(100dvh - 440px), 520px);
  border: 0;
  background: transparent;
  perspective: 1600px;
  transform-origin: center center;
}

.flashcard-flip {
  position: relative;
  width: 100%;
  min-height: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 520ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.flashcard-shell.is-flipped .flashcard-flip {
  transform: rotateX(180deg);
}

.flashcard-shell.skip-flip-transition .flashcard-flip {
  transition: none;
}

.flashcard-shell.is-rating-known {
  animation: flashcardThrowRight 440ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.flashcard-shell.is-rating-unknown {
  animation: flashcardThrowLeft 440ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.flashcard-shell.is-rating-known .flashcard-face {
  background: linear-gradient(180deg, #ffffff, #f5fffb);
}

.flashcard-shell.is-rating-unknown .flashcard-face {
  background: linear-gradient(180deg, #ffffff, #fff8f5);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-rows: 1fr;
  width: 100%;
  min-height: 100%;
  height: 100%;
  padding: 28px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 0;
  background: white;
}

@keyframes flashcardThrowRight {
  0% {
    transform: translateX(0) translateY(0) scale(1) rotate(0deg);
    opacity: 1;
    filter: saturate(1);
  }
  24% {
    transform: translateX(0) translateY(-16px) scale(1.03) rotate(0.8deg);
    opacity: 1;
    filter: saturate(1.03);
  }
  100% {
    transform: translateX(240px) translateY(-72px) scale(0.9) rotate(13deg);
    opacity: 0;
    filter: saturate(1.08);
  }
}

@keyframes flashcardThrowLeft {
  0% {
    transform: translateX(0) translateY(0) scale(1) rotate(0deg);
    opacity: 1;
    filter: saturate(1);
  }
  24% {
    transform: translateX(0) translateY(-16px) scale(1.03) rotate(-0.8deg);
    opacity: 1;
    filter: saturate(0.99);
  }
  100% {
    transform: translateX(-240px) translateY(-72px) scale(0.9) rotate(-13deg);
    opacity: 0;
    filter: saturate(0.96);
  }
}

.flashcard-back {
  transform: rotateX(180deg);
}

.flashcard-word-wrap {
  display: grid;
  place-items: center;
  align-self: stretch;
  min-height: 0;
}

.card-speaker-button {
  color: #61719d;
  background: #fbfcff;
  box-shadow: 0 6px 14px rgba(93, 104, 158, 0.05);
  z-index: 4;
}

.card-speaker-overlay {
  position: absolute;
  top: 18px;
  right: 18px;
}

.speech-inline-status {
  margin: 8px 0 0;
  color: #b25b49;
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.4;
  pointer-events: none;
}

.card-speech-status {
  position: absolute;
  top: 62px;
  right: 20px;
  width: min(260px, calc(100% - 40px));
  padding: 8px 10px;
  border-radius: 14px;
  background: rgba(255, 247, 244, 0.96);
  border: 1px solid rgba(255, 125, 115, 0.18);
  box-shadow: 0 10px 24px rgba(93, 104, 158, 0.08);
  z-index: 3;
  pointer-events: none;
}

.icon-button,
.mini-speak-button {
  position: relative;
}

.mini-speak-button.card-speaker-overlay {
  position: absolute;
}

.card-speaker-button.is-speaking,
.mini-speak-button.is-speaking {
  color: var(--primary);
  border-color: rgba(79, 93, 255, 0.28);
  box-shadow: 0 10px 22px rgba(79, 93, 255, 0.16);
}

.card-speaker-button.is-speaking::after,
.mini-speak-button.is-speaking::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(79, 93, 255, 0.22);
  animation: speakerPulse 1s ease-out infinite;
}

.card-speaker-button.is-speaking svg,
.mini-speak-button.is-speaking svg {
  animation: speakerBounce 0.9s ease-in-out infinite;
}

@keyframes speakerPulse {
  0% {
    transform: scale(0.92);
    opacity: 0.9;
  }
  100% {
    transform: scale(1.2);
    opacity: 0;
  }
}

@keyframes speakerBounce {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
}

.card-main-text {
  align-self: center;
  justify-self: center;
  font-size: clamp(2.7rem, 6vw, 5rem);
  line-height: 1.06;
  font-weight: 400;
  margin: 0;
  font-family: "Avenir Next", Avenir, "Nunito Sans", "Segoe UI", sans-serif;
  letter-spacing: -0.03em;
  color: #303955;
}

.question-text {
  align-self: center;
  justify-self: center;
  font-size: clamp(2rem, 4.2vw, 3.6rem);
  line-height: 1.08;
  font-weight: 400;
  margin: 0;
  font-family: "Avenir Next", Avenir, "Nunito Sans", "Segoe UI", sans-serif;
  letter-spacing: -0.025em;
  color: #303955;
  text-align: center;
}

.card-answer {
  font-size: clamp(2.7rem, 6vw, 5rem);
  font-weight: 400;
  color: #2d3750;
  align-self: center;
  justify-self: center;
  font-family: "Avenir Next", Avenir, "Nunito Sans", "Segoe UI", sans-serif;
  line-height: 1.06;
  letter-spacing: -0.03em;
  margin: 0;
}

.shortcut-strip {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 16px 18px;
  background: #dfe3ff;
  color: #596381;
  font-weight: 500;
}

.flash-top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.audio-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #f6f8ff;
  color: var(--muted);
  font-weight: 600;
}

.audio-toggle input {
  accent-color: var(--primary);
}

.voice-toolbar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.voice-picker {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.compact-voice-picker {
  min-width: 0;
  gap: 4px;
}

.compact-voice-picker span {
  font-size: 0.76rem;
  font-weight: 600;
}

.voice-picker select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fbfcff;
  color: var(--text);
  font-family: "Avenir Next", Avenir, "SF Pro Display", "Segoe UI", sans-serif;
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.2;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

select,
option {
  font-family: "Avenir Next", Avenir, "SF Pro Display", "Segoe UI", sans-serif;
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--text);
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  padding: 5px 10px;
  border-radius: 10px;
  border: 1px solid #9ea7c7;
  background: white;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.05);
  font-size: 0.95rem;
}

.review-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.flashcard-bottom-toolbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: 100%;
  margin-top: 6px;
  padding: 4px 8px max(16px, env(safe-area-inset-bottom, 0px));
}

.progress-toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--primary);
  font-weight: 600;
}

.progress-toggle input {
  width: 46px;
  height: 26px;
  accent-color: var(--primary);
}

.round-action {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  font-size: 1.7rem;
  box-shadow: 0 10px 22px rgba(93, 104, 158, 0.08);
}

.round-action.negative {
  color: #d55242;
  background: white;
}

.round-action.positive {
  color: #1ea86f;
  background: white;
}

.review-counter {
  color: var(--muted);
  font-size: 1.25rem;
  font-weight: 600;
}

.response-actions {
  justify-self: center;
}

.flashcard-bottom-meta {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.flashcard-bottom-tools {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  justify-self: end;
}

.tool-button {
  width: 52px;
  height: 52px;
  color: #5d69ff;
}

.tool-button.active {
  background: #eef1ff;
  border-color: rgba(93, 105, 255, 0.35);
}

.snapshot-grid {
  margin-top: 8px;
}

.table-section {
  padding: 18px;
}

.table-section .section-head {
  margin-bottom: 10px;
}

.table-section .metric-grid {
  gap: 10px;
}

.table-section .metric-block {
  padding: 12px 13px;
}

.table-section .metric-block strong {
  margin-top: 4px;
  font-size: 1.45rem;
}

.table-sort-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-weight: inherit;
}

.sort-indicator {
  display: inline-grid;
  gap: 2px;
  align-items: center;
}

.sort-triangle {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  opacity: 0.28;
}

.sort-triangle.up {
  border-bottom: 5px solid currentColor;
}

.sort-triangle.down {
  border-top: 5px solid currentColor;
}

.table-sort-button.active {
  color: var(--primary);
}

.table-sort-button.active .sort-triangle {
  opacity: 0.2;
}

.table-sort-button.ascending .sort-triangle.up,
.table-sort-button.descending .sort-triangle.down {
  opacity: 1;
}

.flashcard-due-inline {
  color: var(--muted);
  font-weight: 700;
}

.question-panel {
  display: grid;
  gap: 20px;
}

.learn-main-panel {
  display: grid;
  gap: 16px;
  min-height: 0;
}

.learn-stage {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: var(--radius-xl);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.learn-stage-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.learn-feedback-pill {
  min-height: 28px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #f4f6ff;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
}

.learn-feedback-pill:empty {
  display: none;
}

.learn-prompt-shell {
  position: relative;
  display: grid;
  place-items: center;
  min-height: clamp(150px, calc(100dvh - 610px), 220px);
  padding: 20px 52px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #fcfcff, #f8f9fd);
  border: 1px solid var(--line);
}

.learn-speaker-button {
  position: absolute;
  top: 16px;
  right: 16px;
  color: #61719d;
  background: #fbfcff;
  box-shadow: 0 6px 14px rgba(93, 104, 158, 0.05);
}

.question-block {
  display: grid;
  gap: 12px;
  padding: 20px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #fbfcff, #f7f8ff);
  border: 1px solid var(--line);
}

.learn-hero {
  min-height: 210px;
  align-content: center;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.learn-choice-grid {
  gap: 16px;
  align-content: start;
}

.choice-button {
  justify-content: flex-start;
  padding: 16px 18px;
  text-align: left;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, #fbfcff, #f8f9fd);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  min-height: 66px;
}

.learn-bottom-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  width: 100%;
}

.reset-warning {
  color: #c45a4d;
  font-weight: 700;
}

body.fullscreen-active .study-top,
body.fullscreen-active .study-mode-grid,
body.fullscreen-active .topbar,
body.fullscreen-active .study-header-simple {
  display: none;
}

body.fullscreen-active .app-shell {
  width: min(1380px, calc(100vw - 72px));
  min-height: 100dvh;
  height: 100dvh;
  padding-top: 18px;
  padding-bottom: 18px;
}

body.fullscreen-active .content-shell {
  height: 100%;
  gap: 14px;
}

body.fullscreen-active .flashcard-page-clean {
  min-height: 0;
  height: 100%;
  align-content: stretch;
  grid-template-rows: auto auto auto minmax(0, 1fr) auto;
}

body.fullscreen-active .learn-page-clean {
  min-height: 0;
  height: 100%;
  align-content: stretch;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
}

body.fullscreen-active .flashcard-shell {
  min-height: 0;
  height: 100%;
}

body.fullscreen-active .flashcard-clean-top,
body.fullscreen-active .learn-clean-top,
body.fullscreen-active .flashcard-progress-line,
body.fullscreen-active .learn-progress-line,
body.fullscreen-active .flashcard-score-row,
body.fullscreen-active .review-toolbar,
body.fullscreen-active .learn-main-panel,
body.fullscreen-active .learn-stage,
body.fullscreen-active .learn-choice-grid,
body.fullscreen-active .learn-bottom-bar {
  width: min(1180px, 100%);
  margin-inline: auto;
}

body.fullscreen-active .flashcard-stage {
  width: min(1180px, 100%);
  margin-inline: auto;
  min-height: 0;
  height: 100%;
}

body.fullscreen-active[data-page="flashcards"] .app-shell,
body.fullscreen-active[data-page="learn"] .app-shell {
  display: block;
}

body.fullscreen-active[data-page="flashcards"] .content-shell,
body.fullscreen-active[data-page="learn"] .content-shell {
  width: 100%;
}

body.fullscreen-active .flashcard-clean-top,
body.fullscreen-active .learn-clean-top {
  align-items: start;
  gap: 24px;
}

body.fullscreen-active .flashcard-clean-actions,
body.fullscreen-active .learn-top-actions {
  justify-content: flex-end;
}

body.fullscreen-active .flashcard-stage-clean {
  border-radius: 28px;
  box-shadow: 0 18px 42px rgba(83, 94, 168, 0.08);
}

body.fullscreen-active .flashcard-stage {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
}

body.fullscreen-active .shortcut-strip {
  padding: 14px 18px;
}

body.fullscreen-active .review-toolbar,
body.fullscreen-active .learn-bottom-bar {
  padding-inline: 8px;
  padding-bottom: max(8px, env(safe-area-inset-bottom, 0px));
}

body.fullscreen-active .round-action {
  width: 64px;
  height: 64px;
}

body.fullscreen-active .tool-button {
  width: 50px;
  height: 50px;
}

body.fullscreen-active .card-main-text,
body.fullscreen-active .card-answer {
  font-size: clamp(2.6rem, 5vw, 4.6rem);
}

body.fullscreen-active .learn-stage {
  gap: 16px;
  padding: 20px;
}

body.fullscreen-active .learn-main-panel {
  align-content: center;
  gap: 20px;
}

body.fullscreen-active .learn-prompt-shell {
  min-height: clamp(220px, 30dvh, 360px);
}

.choice-button.correct {
  background: rgba(42, 191, 136, 0.12);
  border-color: rgba(42, 191, 136, 0.3);
}

.choice-button.incorrect {
  background: rgba(255, 125, 115, 0.12);
  border-color: rgba(255, 125, 115, 0.3);
}

.review-answer {
  margin: 4px 0 0;
  font-size: 1.15rem;
}

@media (max-width: 1024px) {
  .mode-grid,
  .study-mode-grid,
  .dashboard-grid {
    grid-template-columns: 1fr 1fr;
  }

  .library-hero {
    grid-template-columns: 1fr;
  }

  .modal-grid {
    grid-template-columns: 1fr;
  }

  .auth-panel {
    grid-template-columns: 1fr;
  }

  .study-mode-grid {
    grid-template-columns: 1fr;
  }

  .deck-header,
  .study-top,
  .topbar,
  .review-toolbar {
    grid-template-columns: 1fr;
    display: grid;
  }

  .flashcard-clean-top {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .learn-clean-top {
    grid-template-columns: 1fr;
  }

  .flashcard-clean-actions {
    grid-template-columns: 1fr;
    justify-content: center;
    width: min(100%, 680px);
  }

  .learn-top-actions {
    justify-self: center;
  }

  .flashcard-page-clean {
    min-height: auto;
    grid-template-rows: auto auto auto auto minmax(320px, 1fr) auto;
  }

  .flashcard-score-row {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 760px) {
  body[data-page="flashcards"],
  body[data-page="learn"] {
    overflow: auto;
    height: auto;
  }

  body[data-page="flashcards"] .app-shell,
  body[data-page="learn"] .app-shell {
    min-height: auto;
    height: auto;
    display: block;
  }

  .app-shell {
    width: min(100% - 20px, 1280px);
  }

  .language-grid,
  .mode-grid,
  .dashboard-grid,
  .metric-grid,
  .settings-grid,
  .choice-grid {
    grid-template-columns: 1fr;
  }

  .learn-stage-head,
  .learn-bottom-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .compact-voice-picker {
    width: 100%;
  }

  .audio-control-group {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .topbar-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .deck-row {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
  }

  .deck-row-main {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 14px;
  }

  .deck-row-actions {
    display: block;
  }

  .flashcard-shell {
    min-height: min(400px, calc(100dvh - 380px));
    height: min(400px, calc(100dvh - 380px));
  }

  .flashcard-flip,
  .flashcard-face {
    min-height: 100%;
    height: 100%;
  }

  .shortcut-strip,
  .review-toolbar,
  .active-deck-box {
    flex-direction: column;
    align-items: stretch;
  }

  .page-links {
    justify-content: flex-start;
  }

  .flashcard-bottom-meta {
    justify-content: center;
  }

  .flashcard-bottom-tools {
    justify-content: center;
  }

  .flashcard-face {
    padding: 20px;
  }
}