:root {
  color-scheme: light;
  --bg: #f7f8f6;
  --ink: #1f2933;
  --muted: #5f6c76;
  --line: #d8dfd8;
  --accent: #27745f;
  --button-ink: #ffffff;
  --surface: #ffffff;
  --surface-muted: #f9faf8;
  --progress-bg: #edf1ed;
  --danger: #8a1f1f;
  --danger-line: #d98b8b;
  --warning: #9a6a00;
  --warning-line: #d5a427;
  --curated-line: #8ab8a9;
  --shadow: rgba(31, 41, 51, 0.12);
  --sticky-shadow: rgba(31, 41, 51, 0.08);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111816;
  --ink: #e6eee9;
  --muted: #a3b2ad;
  --line: #2b3a35;
  --accent: #65c4a6;
  --button-ink: #07110e;
  --surface: #17211e;
  --surface-muted: #1d2925;
  --progress-bg: #263831;
  --danger: #f1b3b3;
  --danger-line: #8d4646;
  --warning: #e8c16f;
  --warning-line: #8d6a25;
  --curated-line: #3f826d;
  --shadow: rgba(0, 0, 0, 0.34);
  --sticky-shadow: rgba(0, 0, 0, 0.26);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", Arial, sans-serif;
}

a {
  color: inherit;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 56px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.brand {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.app-header nav {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}

.desktop-nav-items,
.mobile-nav-menu,
.auth-nav-item {
  align-items: center;
  display: flex;
  gap: 16px;
}

.mobile-nav-menu {
  display: none;
}

.app-header nav a {
  align-items: center;
  display: inline-flex;
  min-height: 36px;
  text-decoration: none;
  white-space: nowrap;
}

.mobile-nav-menu {
  position: relative;
}

.mobile-nav-menu summary {
  align-items: center;
  cursor: pointer;
  display: inline-flex;
  list-style: none;
  min-height: 36px;
  white-space: nowrap;
}

.mobile-nav-menu summary::-webkit-details-marker {
  display: none;
}

.mobile-nav-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 28px var(--shadow);
  display: grid;
  gap: 4px;
  padding: 8px;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  width: 200px;
  z-index: 20;
}

.nav-form {
  margin: 0;
}

.nav-form button,
button,
.button-link {
  min-height: 36px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: var(--button-ink);
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  padding: 0 14px;
}

.button-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.theme-toggle {
  border-color: var(--line);
  background: var(--surface-muted);
  color: var(--accent);
  min-height: 36px;
  white-space: nowrap;
}

.theme-toggle:hover,
.theme-toggle:focus {
  border-color: var(--accent);
}

.flash-stack {
  display: grid;
  gap: 8px;
  padding: 16px 24px 0;
}

.flash {
  width: min(960px, 100%);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  padding: 10px 12px;
}

.flash-error {
  border-color: var(--danger-line);
  color: var(--danger);
}

.page-section {
  padding: 48px 24px;
}

.container {
  width: min(960px, 100%);
  margin: 0 auto;
}

h1 {
  margin: 0 0 12px;
  font-size: 40px;
  line-height: 1.1;
}

p {
  max-width: 720px;
  color: var(--muted);
  line-height: 1.6;
}

.form-shell {
  width: min(420px, 100%);
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 24px;
}

.oauth-login-panel {
  display: grid;
  gap: 10px;
  margin-top: 18px;
  text-align: center;
}

.oauth-login-panel span {
  color: var(--muted);
  font-size: 13px;
}

.oauth-google-button {
  justify-content: center;
  width: 100%;
}

form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="number"],
input[type="url"],
input[type="file"],
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  padding: 8px 10px;
}

input::placeholder,
textarea::placeholder {
  color: var(--muted);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  outline: 2px solid color-mix(in srgb, var(--accent) 30%, transparent);
  outline-offset: 1px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="number"],
input[type="url"],
select {
  min-height: 40px;
}

input[type="checkbox"] {
  accent-color: var(--accent);
}

textarea {
  min-height: 96px;
  resize: vertical;
}

.inline-field {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-heading {
  margin-bottom: 24px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.metric-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 18px;
}

.metric-label {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}

.metric-card strong {
  font-size: 28px;
}

.metric-hint {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  margin: 8px 0 0;
}

.learning-metric-help {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  margin: -12px 0 32px;
  padding: 12px 14px;
}

.learning-metric-help summary {
  color: var(--accent);
  cursor: pointer;
  font-weight: 700;
}

.learning-metric-help ul {
  color: var(--muted);
  margin: 12px 0 0;
  padding-left: 20px;
}

.learning-session-status {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 0;
}

.learning-session-status summary {
  align-items: center;
  color: var(--accent);
  cursor: pointer;
  display: flex;
  font-weight: 700;
  justify-content: space-between;
  min-height: 48px;
  padding: 0 16px;
}

.learning-session-status .metric-grid {
  margin: 0;
  padding: 0 16px 16px;
}

.learning-session-status .metric-card {
  background: var(--surface-muted);
}

.table-section h2 {
  font-size: 20px;
  margin-top: 32px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}

.table-section {
  overflow-x: auto;
}

.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 12px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 10px;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 13px;
}

.search-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  align-items: end;
  gap: 12px;
  margin-bottom: 24px;
}

.result-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 20px;
}

.section-gap {
  margin-top: 18px;
}

.result-panel h2 {
  margin-top: 0;
}

.result-short {
  color: var(--ink);
  font-size: 18px;
}

.result-meta {
  color: var(--muted);
  font-size: 13px;
}

.learning-note {
  border-left: 3px solid var(--accent);
  margin: 16px 0;
  padding-left: 12px;
}

.learning-note p {
  margin: 6px 0 0;
}

.unfamiliar-review-panel {
  margin: 16px 0;
}

.unfamiliar-review-panel summary {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--accent);
  cursor: pointer;
  display: inline-flex;
  font-weight: 700;
  min-height: 38px;
  padding: 0 14px;
}

.unfamiliar-word-list {
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.unfamiliar-word-list li {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 10px;
}

.source-status-line {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 12px;
}

.source-quick-add-panel {
  margin: 14px 0;
}

.source-quick-add-panel h3 {
  margin: 0 0 12px;
}

.anchor-target {
  scroll-margin-top: 16px;
}

.status-badge {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  display: inline-flex;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  padding: 5px 8px;
  white-space: nowrap;
}

.status-badge-curated {
  border-color: var(--curated-line);
  color: var(--accent);
}

.stack-item + .stack-item {
  border-top: 1px solid var(--line);
  margin-top: 16px;
  padding-top: 16px;
}

.inline-action {
  display: inline-grid;
  margin: 0;
}

.inline-action button {
  min-height: 32px;
  background: var(--surface);
  color: var(--accent);
}

.inline-action .star-toggle-button {
  min-width: 36px;
  border-color: var(--warning-line);
  color: var(--warning);
  font-size: 18px;
  line-height: 1;
  padding: 0 8px;
}

.danger-action button {
  border-color: var(--danger-line);
  color: var(--danger);
}

.secondary-button {
  border-color: var(--line);
  background: var(--surface);
  color: var(--accent);
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.compact-action-row {
  margin-top: 8px;
}

.compact-sort-form {
  margin: 12px 0;
  max-width: 240px;
}

.compact-sort-form label {
  gap: 6px;
}

.compact-table-action {
  min-height: 30px;
  padding: 0 10px;
  white-space: nowrap;
}

.list-item-note-form {
  display: grid;
  gap: 8px;
  min-width: 180px;
}

.list-item-note-form textarea {
  min-width: 0;
  resize: vertical;
}

.list-item-note-form button {
  justify-self: start;
}

.list-item-note-status {
  color: var(--muted);
  font-size: 13px;
  min-height: 18px;
}

.list-item-note-status[data-state="saved"] {
  color: var(--accent);
}

.list-item-note-status[data-state="error"] {
  color: var(--danger);
}

.list-item-note-viewer {
  align-items: flex-start;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-width: 180px;
}

.list-item-note-text {
  margin: 3px 0 0;
  max-width: 36rem;
  white-space: pre-wrap;
}

.empty-note-text {
  color: var(--muted);
}

.inline-note-editor {
  flex: none;
  position: relative;
}

.inline-note-editor summary {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--accent);
  cursor: pointer;
  display: inline-flex;
  font-size: 14px;
  height: 30px;
  justify-content: center;
  list-style: none;
  width: 30px;
}

.inline-note-editor summary::-webkit-details-marker {
  display: none;
}

.inline-note-editor[open] {
  flex-basis: 100%;
}

.inline-note-editor[open] summary {
  margin-bottom: 8px;
}

.inline-title-editor {
  margin: 12px 0;
}

.inline-title-display {
  display: inline-grid;
  gap: 4px;
  cursor: text;
}

.inline-title-display strong {
  font-size: 24px;
}

.inline-title-form {
  max-width: 520px;
}

.compact-add-word-form {
  grid-template-columns: minmax(180px, 1fr) auto;
  align-items: end;
  gap: 10px;
}

.compact-add-word-term {
  min-width: 0;
}

.compact-add-word-button {
  white-space: nowrap;
}

.optional-note-field {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 14px;
}

.optional-note-field summary {
  cursor: pointer;
  width: fit-content;
}

.optional-note-field label {
  margin-top: 10px;
}

.pagination-row,
.selected-word-basket {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 16px 0;
}

.selection-summary {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-muted);
  padding: 12px;
}

.selection-chip {
  min-height: 30px;
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
}

.multi-list-picker {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-bottom: 16px;
}

.multi-list-option {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  gap: 8px;
  padding: 10px;
}

.multi-list-option .result-meta {
  margin-left: auto;
}

.progress-shell {
  width: 100%;
  height: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--progress-bg);
}

.progress-bar {
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 180ms ease;
}

.checkbox-grid {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.checkbox-row {
  display: grid;
  grid-template-columns: 20px 1fr;
  align-items: start;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-muted);
  padding: 10px;
}

.checkbox-row small {
  display: block;
  color: var(--muted);
  margin-top: 4px;
}

.table-checkbox-label {
  display: inline-flex;
  grid-auto-flow: unset;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.source-mobile-task-nav,
.mobile-selection-bar {
  display: none;
}

.learning-card-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 8px;
}

.visual-mode-toggle {
  align-items: center;
  color: var(--muted);
  display: inline-flex;
  font-size: 14px;
  gap: 8px;
}

.learning-word {
  min-height: 1.2em;
}

.word-edge-highlight__edge {
  color: #008cff;
  font-weight: 800;
}

[data-theme="dark"] .word-edge-highlight__edge {
  color: #4db3ff;
}

@media (max-width: 560px) {
  .app-header {
    align-items: center;
    gap: 12px;
    min-width: 0;
    padding: 8px 16px;
  }

  .brand {
    align-items: center;
    display: inline-flex;
    flex: 0 0 auto;
    min-height: 44px;
  }

  .app-header nav {
    flex: 1 1 auto;
    gap: 8px;
    justify-content: flex-end;
    min-width: 0;
    overflow: visible;
  }

  .desktop-nav-items {
    display: none;
  }

  .mobile-nav-menu {
    display: block;
    flex: 0 0 auto;
    position: static;
  }

  .auth-nav-item {
    flex: 0 0 auto;
    gap: 6px;
  }

  .app-header nav a,
  .mobile-nav-menu summary,
  .nav-form button {
    background: var(--surface-muted);
    border: 1px solid var(--line);
    border-radius: 6px;
    color: var(--muted);
    flex: 0 0 auto;
    min-height: 44px;
    padding: 0 10px;
  }

  .mobile-nav-panel {
    align-content: start;
    display: grid;
    gap: 8px;
    grid-template-columns: 1fr 1fr;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    position: fixed;
    left: 16px;
    right: 16px;
    top: 64px;
    width: auto;
  }

  .mobile-nav-panel a {
    justify-content: flex-start;
    min-width: 0;
  }

  .theme-toggle {
    flex: 0 0 auto;
    padding: 0 10px;
  }

  .nav-form {
    flex: 0 0 auto;
  }

  .page-section {
    padding: 32px 16px;
  }

  h1 {
    font-size: 32px;
  }

  .result-panel,
  .form-shell {
    padding: 18px;
  }

  .metric-grid {
    gap: 12px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-bottom: 24px;
  }

  .metric-card {
    padding: 16px;
  }

  .metric-card strong {
    font-size: 26px;
  }

  .button-link,
  button,
  input[type="file"],
  input[type="text"],
  input[type="email"],
  input[type="password"],
  select {
    min-height: 44px;
  }

  .button-link,
  button {
    justify-content: center;
  }

  .compact-table-action,
  .inline-action button {
    min-height: 44px;
  }

  .action-row {
    align-items: stretch;
  }

  .action-row > .button-link,
  .action-row > button,
  .action-row > form {
    flex: 1 1 140px;
  }

  .action-row > form > button {
    width: 100%;
  }

  .search-form {
    grid-template-columns: 1fr;
  }

  .compact-add-word-form {
    grid-template-columns: 1fr;
  }

  .table-section {
    overflow: visible;
  }

  .table-section table {
    background: transparent;
    display: block;
  }

  .table-section thead {
    display: none;
  }

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

  .table-section tr {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    display: grid;
    overflow: hidden;
  }

  .table-section td {
    align-items: start;
    border-bottom: 1px solid var(--line);
    display: grid;
    gap: 4px;
    grid-template-columns: minmax(86px, 38%) minmax(0, 1fr);
    padding: 10px 12px;
  }

  .table-section td:last-child {
    border-bottom: 0;
  }

  .table-section td::before {
    color: var(--muted);
    content: attr(data-label);
    font-size: 13px;
    font-weight: 600;
  }

  .table-section td:not([data-label]) {
    display: block;
  }

  .table-section td:not([data-label])::before {
    content: none;
  }

  .table-section td[colspan] {
    display: block;
  }

  .table-section td[colspan]::before {
    content: none;
  }

  .table-section td a:not(.button-link) {
    align-items: center;
    display: inline-flex;
    min-height: 44px;
  }

  .table-section td input[type="checkbox"] {
    height: 22px;
    justify-self: end;
    width: 22px;
  }

  .table-checkbox-label {
    min-height: 44px;
  }

  .selection-summary {
    padding: 14px;
  }

  .selection-chip {
    min-height: 38px;
  }

  .source-task-panel,
  .source-word-browser {
    scroll-margin-top: 78px;
  }

  .source-mobile-task-nav {
    display: flex;
    gap: 8px;
    margin-top: 14px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .source-mobile-task-nav a {
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 6px;
    color: var(--accent);
    display: inline-flex;
    flex: 0 0 auto;
    font-weight: 600;
    min-height: 44px;
    padding: 0 12px;
    text-decoration: none;
  }

  .source-word-browser {
    padding-bottom: 92px;
  }

  .mobile-selection-bar {
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px 8px 0 0;
    bottom: 0;
    box-shadow: 0 -6px 18px var(--sticky-shadow);
    display: flex;
    gap: 10px;
    justify-content: space-between;
    left: 16px;
    padding: 10px 12px;
    position: sticky;
    right: 16px;
    z-index: 6;
  }

  .mobile-selection-bar button {
    flex: 0 0 auto;
  }

  .study-answer-row {
    background: var(--surface);
    border-top: 1px solid var(--line);
    bottom: 0;
    left: 0;
    margin: 18px -18px -18px;
    padding: 12px 18px;
    position: sticky;
    right: 0;
    z-index: 5;
  }
}