:root {
  color-scheme: light;
  --paper: #f7f8f4;
  --surface: #ffffff;
  --surface-2: #eef3f1;
  --surface-3: #b0c9c6;
  --ink: #182523;
  --muted: #65736f;
  --line: #d8e1dd;
  --teal: #1f6f6a;
  --teal-dark: #154c49;
  --amber: #b76a2b;
  --blue: #315f8c;
  --plum: #6b4d6d;
  --warn: #a34232;
  --shadow: 0 18px 45px rgba(25, 42, 39, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: linear-gradient(180deg, #eef3f1 0%, var(--paper) 38%, #ffffff 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body.modal-open {
  overflow: hidden;
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  min-height: 40px;
  padding: 0 14px;
}

button:not(.active):not([aria-pressed="true"]):enabled:hover {
  background: var(--surface-3);
}

button:disabled,
input:disabled,
select:disabled {
  cursor: default;
  opacity: 0.5;
}

button:focus-visible,
input:focus-visible,
a:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(49, 95, 140, 0.35);
  outline-offset: 2px;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 42px;
}

.topbar {
}

.hero-copy {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(520px, 1.15fr);
  gap: 24px;
  align-items: end;
  padding: 24px 0 18px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 22px;
  font-size: clamp(2.3rem, 6vw, 5.2rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.hero-image {
  width: 100%;
  height: 260px;
  align-self: center;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(88px, 1fr));
  gap: 10px;
}

.stat {
  border-left: 3px solid var(--teal);
  background: rgba(255, 255, 255, 0.72);
  padding: 10px 12px;
}

.stat strong {
  display: block;
  font-size: 1.25rem;
  line-height: 1.1;
}

.stat span {
  color: var(--muted);
  font-size: 0.78rem;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(230px, 270px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  margin-top: 24px;
}

.workspace-main {
  min-width: 0;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 18px;
  align-self: start;
  min-height: min(520px, calc(100vh - 36px));
  padding: 16px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.search-box {
  display: grid;
  gap: 7px;
  width: 100%;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.search-box input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0 14px;
  color: var(--ink);
  background: var(--surface);
}

.segmented,
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.segmented {
  width: 100%;
}

.segmented button {
  flex: 1 1 70px;
}

.card-default-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 44px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 750;
  cursor: pointer;
  white-space: nowrap;
}

.card-default-toggle[hidden] {
  display: none;
}

.card-default-toggle input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.toggle-slider {
  position: relative;
  flex: 0 0 auto;
  width: 46px;
  height: 26px;
  border-radius: 8px;
  background: var(--line);
}

.toggle-slider::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 6px;
  background: #ffffff;
  box-shadow: 0 2px 6px rgba(25, 42, 39, 0.2);
  transition: transform 160ms ease;
}

.card-default-toggle:hover .toggle-slider {
  background: var(--surface-2);
}

.card-default-toggle input:checked + .toggle-slider {
  background: var(--teal);
}

.card-default-toggle input:checked + .toggle-slider::after {
  transform: translateX(22px);
}

.card-default-toggle input:focus-visible + .toggle-slider {
  outline: 3px solid rgba(49, 95, 140, 0.35);
  outline-offset: 2px;
}

.toggle-label {
  line-height: 1;
  font-size: 10pt;
  font-weight: 400;
}

.filter-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding-top: 4px;
}

.filter-row button {
  width: 100%;
  min-width: 0;
  padding-inline: 8px;
}

.tab-button.active,
.filter-button.active {
  background: var(--teal);
  color: #ffffff;
  border-color: var(--teal);
}

.status-line {
  min-height: 24px;
  margin: 0 0 16px;
  color: var(--muted);
}

.sidebar-footer {
  display: grid;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.controls > #resetProgressButton {
  margin-top: auto;
  width: 100%;
}

.sidebar-footer .status-line {
  margin: 0;
  font-weight: 750;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.card-modal[hidden],
.edit-modal[hidden] {
  display: none;
}

.card-modal,
.edit-modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card-modal {
  z-index: 20;
}

.edit-modal {
  z-index: 30;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(24, 37, 35, 0.58);
}

.card-modal-panel {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 10px;
  width: min(780px, 100%);
  max-height: calc(100vh - 48px);
  overflow: auto;
}

.modal-close {
  justify-self: end;
  background: var(--surface);
  box-shadow: 0 4px 8px rgba(25, 42, 39, 0.1);
}

.modal-flashcard {
  width: 100%;
  min-height: auto;
}

.edit-modal-panel {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 16px;
  width: min(560px, 100%);
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.edit-modal-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 14px;
}

.edit-modal-heading h2 {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  line-height: 1;
  letter-spacing: 0;
}

.edit-field {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.edit-field input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0 12px;
  color: var(--ink);
  font-size: 1.05rem;
}

.related-editor {
  background: var(--surface-2);
  display: grid;
  gap: 10px;
  margin: 0 32px;
  padding: 20px;
  border-radius: 8px;
}

.related-editor-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.related-mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 800;
}

.related-mode-toggle input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.related-mode-toggle input:checked + .toggle-slider {
  background: var(--warn);
}

.related-mode-toggle input:checked + .toggle-slider::after {
  transform: translateX(22px);
}

.related-mode-toggle input:focus-visible + .toggle-slider {
  outline: 3px solid rgba(49, 95, 140, 0.35);
  outline-offset: 2px;
}

.related-editor-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.related-editor-controls select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0 12px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

.edit-status {
  min-height: 22px;
  margin: 0;
  margin-top: 20px;
  margin-bottom: -10px;
  color: var(--muted);
  line-height: 1.35;
  font-size: 10pt;
}

.edit-status.success {
  color: var(--teal-dark);
  font-weight: 800;
}

.edit-status.error {
  color: var(--warn);
  font-weight: 800;
}

.edit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.study-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
}

.flashcard,
.quiz-panel,
.side-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 8px 28px rgba(25, 42, 39, 0.08);
}

.flashcard,
.quiz-panel {
  position: relative;
  min-height: 430px;
  padding: clamp(20px, 4vw, 34px);
}

.word-heading {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: clamp(2rem, 7vw, 4.8rem);
  line-height: 1;
  letter-spacing: 0;
}

.word-heading-row,
.quiz-word-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.lookup-line,
.source-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.88rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  padding: 0 10px;
  background: var(--surface-2);
  color: var(--teal-dark);
  font-weight: 700;
  font-size: 0.78rem;
}

.note-box {
  margin-top: 20px;
  border-left: 4px solid var(--amber);
  padding: 12px 14px;
  background: #fff6ec;
}

.note-box b {
  display: block;
  margin-bottom: 4px;
}

.related-words {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
}

.related-words > span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.related-word-button {
  min-height: 32px;
  border-color: var(--line);
  background: var(--surface);
  color: var(--teal-dark);
  padding: 0 10px;
  font-size: 0.84rem;
  font-weight: 800;
}

.related-word-button:hover {
  background: var(--surface-2);
}

.pronunciation-audio {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: 0;
}

.audio-button {
  min-height: 32px;
  border-color: var(--line);
  background: var(--surface);
  color: var(--blue);
  padding: 0 9px;
  font-size: 0.84rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.audio-button .fa-volume {
  --speaker-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='black' d='M3 9v6h4l5 4V5L7 9H3z'/%3E%3Cpath fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' d='M16 9.5c1.1 1.3 1.1 3.7 0 5M19 7c2.7 3 2.7 7 0 10'/%3E%3C/svg%3E");
  position: relative;
  display: inline-block;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  background: currentColor;
  -webkit-mask: var(--speaker-icon) center / contain no-repeat;
  mask: var(--speaker-icon) center / contain no-repeat;
  font-size: 0;
  line-height: 1;
}

.audio-button .fa-volume::before {
  content: none;
}

.audio-button .fa-volume::after {
  content: none;
}

.audio-region {
  line-height: 1;
}

.audio-button:hover,
.audio-button.playing {
  background: var(--surface-2);
}

.definition-box {
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.definition-box.hidden {
  color: var(--muted);
}

.definition-box ol {
  margin: 0;
  padding-left: 22px;
}

.definition-box li + li {
  margin-top: 12px;
}

.definition-pos {
  color: var(--blue);
  font-weight: 800;
}

.definition-link {
  display: inline;
  min-height: 0;
  border: 0;
  border-bottom: 1px dotted currentColor;
  border-radius: 0;
  background: transparent;
  color: var(--blue);
  padding: 0 1px;
  font-weight: 800;
  line-height: inherit;
  vertical-align: baseline;
}

.definition-link:hover {
  background: rgba(49, 95, 140, 0.08);
}

.missing-box {
  margin-top: 24px;
  padding: 16px;
  border: 1px solid #e6c4bd;
  background: #fff3f0;
  color: var(--warn);
  border-radius: 7px;
}

.card-actions,
.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

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

.known-action {
  background: var(--surface);
  border-color: #b9dac5;
  color: #1e6038;
  font-weight: 800;
}

.known-action.active {
  background: #1e6038;
  border-color: #1e6038;
  color: #ffffff;
}

/*
.known-action:hover {
  background: #edf7f1;
}

.known-action.active:hover {
  background: #184f2f;
}
*/

.flag-action.active {
  background: var(--plum);
  border-color: var(--plum);
  color: #ffffff;
}

.edit-button {
  display: grid;
  place-items: center;
  border: 1.5px solid var(--muted);
  border-right: 0;
  min-width: 0;
  min-height: 0;
  padding: 4px 4px 4px 6px;
  background: #fff;
  color: var(--muted);
  border-radius: 0 !important;
  border-top-left-radius: 4px !important;
  border-bottom-left-radius: 4px !important;
  font-size: 10pt;
}

.edit-button:hover {
  color: #fff;
  border-color: #fff;
  background: var(--teal) !important;
}

.card-edit-button {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  color: var(--blue);
}

.danger-action {
  background: #fff3f0;
  border-color: #d9a197;
  color: var(--warn);
}

.source-line a {
  color: var(--blue);
  font-weight: 700;
}

.side-panel {
  padding: 16px;
}

.meter-row,
.list-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.list-toolbar {
  justify-content: flex-end;
}

.progress-track {
  height: 8px;
  margin: 14px 0 16px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
}

.progress-track span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--teal), var(--amber));
}

.mini-list {
  display: grid;
  gap: 8px;
  max-height: 360px;
  overflow: auto;
}

.mini-item {
  width: 100%;
  min-height: 38px;
  text-align: left;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.mini-item.active {
  background: var(--surface-2);
  border-color: #a9bbb5;
  color: var(--teal-dark);
  font-weight: 800;
}

.quiz-word {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1;
  overflow-wrap: anywhere;
}

.quiz-word-row {
  margin-bottom: 18px;
}

.answer-grid {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.answer-button {
  cursor: pointer;
  min-height: 64px;
  padding: 14px 16px;
  text-align: left;
  line-height: 1.35;
}

.answer-button.correct {
  border-color: #76b58b;
  background: #edf7f1;
}

.answer-button.wrong {
  border-color: #d9a197;
  background: #fff3f0;
}

.quiz-result {
  min-height: 26px;
  margin-top: 16px;
  font-weight: 800;
}

.word-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.list-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(170px, 0.6fr) minmax(0, 1.4fr) auto;
  gap: 14px;
  align-items: start;
  width: 100%;
  min-height: 72px;
  padding: 14px 42px 14px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
  overflow: hidden;
  text-align: left;
}

.list-item:hover {
  background: var(--surface-3);
}

.list-word-cell {
  display: grid;
  gap: 8px;
  align-content: start;
}

.list-word {
  font-weight: 850;
  overflow-wrap: anywhere;
}

.list-word-cell .pronunciation-audio {
  margin-top: 0;
}

.list-definition {
  color: #2b3a37;
  line-height: 1.42;
}

.list-note {
  margin-top: 6px;
  color: var(--amber);
  font-weight: 800;
}

.list-definition .related-words {
  margin-top: 8px;
}

.state-mark {
  display: grid;
  gap: 8px;
  justify-items: end;
  color: var(--muted);
  font-size: 0.82rem;
  white-space: nowrap;
}

.list-edit-button {
  position: absolute;
  top: 50%;
  right: 0;
  transform: translate(100%, -50%);
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  place-items: center end;
  transition:
    opacity 160ms ease,
    transform 160ms ease,
    visibility 0s linear 160ms;
}

.list-item:hover .list-edit-button {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translate(0, -50%);
  transition-delay: 0s;
}

.letter-filter {
  display: grid;
  grid-template-columns: repeat(26, minmax(30px, 1fr));
  gap: 4px;
}

.letter-button {
  min-width: 0;
  min-height: 0;
  padding: 4px 2px;
  font-weight: 700;
  text-transform: uppercase;
  border-radius: 6px;
  font-size: 10pt;
}

.letter-button.active {
  background: var(--teal);
  color: #ffffff;
}

.letter-button:not(.active):hover {
  background: var(--surface-3);
}

@media (max-width: 920px) {
  .workspace,
  .study-layout {
    grid-template-columns: 1fr;
  }

  .controls {
    position: static;
    min-height: auto;
  }

  .hero-copy {
    grid-template-columns: 1fr;
    gap: 14px;
    min-height: auto;
    padding-bottom: 0;
  }

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

  .side-panel {
    order: -1;
  }

  .mini-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-height: 220px;
  }

  .letter-filter {
    grid-template-columns: repeat(13, minmax(30px, 1fr));
  }
}

@media (max-width: 680px) {
  .app-shell {
    width: min(100% - 20px, 1180px);
    padding-top: 10px;
  }

  .topbar {
    gap: 14px;
  }

  .hero-image {
    height: 170px;
  }

  .stats-grid,
  .list-item {
    grid-template-columns: 1fr;
  }

  .workspace {
    margin-top: 14px;
  }

  .filter-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .card-modal,
  .edit-modal {
    align-items: start;
    padding: 12px;
    overflow: auto;
  }

  .card-modal-panel {
    max-height: none;
  }

  .flashcard,
  .quiz-panel {
    min-height: 360px;
  }

  .modal-flashcard {
    min-height: auto;
  }

  .mini-list {
    grid-template-columns: 1fr;
  }

  .letter-filter {
    grid-template-columns: repeat(7, minmax(30px, 1fr));
  }

  .related-editor-heading,
  .related-editor-controls {
    grid-template-columns: 1fr;
  }

  .related-editor-heading {
    align-items: start;
    flex-direction: column;
  }
}