:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --ink: #1f2430;
  --muted: #6b7280;
  --border: #e3e6ea;
  --primary: #3b5bdb;
  --primary-ink: #ffffff;
  --true: #2f9e44;
  --false: #e03131;
  --review: #e8983a;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(20, 30, 60, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171d;
    --card-bg: #1d222b;
    --ink: #e8ebf0;
    --muted: #9aa2b1;
    --border: #2c333f;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

/* Ensure the hidden attribute wins over display:flex/block rules below. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

.app {
  width: 100%;
  max-width: 640px;
  padding: 32px 20px 48px;
}

.app__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 20px;
}

.app__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.app__progress {
  font-size: 0.85rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 32px;
}

.card__word {
  font-size: 2.4rem;
  font-weight: 700;
  text-align: center;
  margin: 0;
  word-break: break-word;
}

.card__phonetic {
  text-align: center;
  color: var(--muted);
  margin: 6px 0 0;
  font-size: 1rem;
}

.recall {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.recall__input {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s ease;
}

.recall__input:focus {
  border-color: var(--primary);
}

.btn {
  font-size: 1rem;
  font-weight: 600;
  padding: 13px 18px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.05s ease, opacity 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

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

.btn--true {
  background: var(--true);
  color: #fff;
  flex: 1;
}

.btn--false {
  background: var(--false);
  color: #fff;
  flex: 1;
}

.btn--review {
  background: var(--review);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  font-weight: 500;
}

.btn--ghost:hover {
  color: var(--ink);
}

.answer {
  margin-top: 28px;
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.answer__block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.answer__label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 700;
}

.answer__text {
  margin: 0;
  font-size: 1.02rem;
}

.answer__text--example {
  color: var(--muted);
  font-style: italic;
}

.answer__actions {
  display: flex;
  gap: 12px;
  margin-top: 6px;
}

.app__footer {
  margin-top: 24px;
  text-align: center;
}

.app__footer--tools {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.app__back {
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
}

.app__back:hover {
  color: var(--ink);
}

/* ---- Landing menu ---- */

.app--menu {
  padding-top: 56px;
  max-width: 900px;
}

.menu__head {
  text-align: center;
  margin-bottom: 32px;
}

.menu__title {
  font-size: 1.7rem;
  font-weight: 700;
  margin: 0;
}

.menu__subtitle {
  color: var(--muted);
  margin: 8px 0 0;
}

.menu__cards {
  display: grid;
  gap: 16px;
}

@media (min-width: 720px) {
  .menu__cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.entry {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 28px 24px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  transition: transform 0.08s ease, border-color 0.15s ease;
}

.entry:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.entry__icon {
  font-size: 1.8rem;
}

.entry__name {
  font-size: 1.2rem;
  font-weight: 700;
}

.entry__desc {
  color: var(--muted);
  font-size: 0.92rem;
}

.entry__count {
  margin-top: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

/* ---- Done / empty state ---- */

.done {
  text-align: center;
  padding: 24px 0 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.done__emoji {
  font-size: 2.6rem;
  margin: 0;
}

.done__text {
  margin: 0;
  color: var(--muted);
}

label.btn {
  display: inline-block;
  text-align: center;
}

/* ---- Browse bar on the menu ---- */

.browse {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}

.browse:hover {
  border-color: var(--primary);
}

.browse__icon {
  font-size: 1.4rem;
}

.browse__text {
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---- Word-list page ---- */

.app--list {
  max-width: 760px;
  padding-bottom: 96px; /* room for the sticky action bar */
}

.controls {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg);
  padding: 10px 0 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.controls__search {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--ink);
  outline: none;
}

.controls__search:focus {
  border-color: var(--primary);
}

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

.chip {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--muted);
  cursor: pointer;
}

.chip span {
  opacity: 0.7;
  margin-left: 4px;
  font-variant-numeric: tabular-nums;
}

.chip--active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.controls__bulk {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.linkbtn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

.controls__hint {
  font-size: 0.8rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.list {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card-bg);
}

.list__empty {
  padding: 32px;
  text-align: center;
  color: var(--muted);
}

.row {
  display: grid;
  grid-template-columns: 24px 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}

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

.row:has(.row__check:checked) {
  background: rgba(59, 91, 219, 0.09);
}

.row__check {
  width: 17px;
  height: 17px;
  accent-color: var(--primary);
  cursor: pointer;
}

.row__main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.row__word {
  font-weight: 600;
  font-size: 1rem;
}

.row__ph {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.8rem;
}

.row__meaning {
  color: var(--muted);
  font-size: 0.85rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 9px;
  border-radius: 999px;
  white-space: nowrap;
}

.badge--learning {
  background: rgba(107, 114, 128, 0.16);
  color: var(--muted);
}

.badge--review {
  background: rgba(232, 152, 58, 0.18);
  color: #b96a12;
}

.badge--familiar {
  background: rgba(47, 158, 68, 0.16);
  color: #2f9e44;
}

.actionbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 18px;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  box-shadow: 0 -6px 24px rgba(20, 30, 60, 0.1);
}

.actionbar__count {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

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

.actionbar .btn {
  padding: 10px 14px;
  font-size: 0.9rem;
}