:root {
  --bg: #f6f4ee;
  --surface: #ffffff;
  --surface-2: #ece8dd;
  --ink: #26211a;
  --ink-soft: #6b6155;
  --line: #ddd6c7;
  --accent: #2b4fd6;
  --accent-soft: #e8ecfb;
  --accent-ink: #1c3399;
  --good: #1f8a55;
  --good-soft: #e2f5ea;
  --bad: #c23b2f;
  --bad-soft: #fbe7e4;
  --shadow: rgba(38, 33, 26, 0.14);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a170f;
    --surface: #262117;
    --surface-2: #332c1e;
    --ink: #f1ead9;
    --ink-soft: #b9ac95;
    --line: #47402f;
    --accent: #7f9bff;
    --accent-soft: #2a3468;
    --accent-ink: #dbe2ff;
    --good: #6fd39c;
    --good-soft: #1f3d2c;
    --bad: #f0958a;
    --bad-soft: #402522;
    --shadow: rgba(0, 0, 0, 0.4);
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Instrument Sans', system-ui, sans-serif;
  padding: 0 16px;
}

.wrap {
  max-width: 460px;
  margin: 0 auto;
  padding: 24px 0 48px;
}

header.top {
  text-align: center;
  margin-bottom: 18px;
}

header.top .brand {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

header.top .tag {
  color: var(--ink-soft);
  font-size: 13px;
  margin-top: 6px;
  line-height: 1.5;
}

.day-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.day-row label {
  font-size: 12.5px;
  color: var(--ink-soft);
  white-space: nowrap;
}
.day-row .select {
  flex: 1;
}

nav.tabs {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  gap: 4px;
  background: var(--bg);
  padding-bottom: 10px;
  margin-bottom: 14px;
  overflow-x: auto;
}

nav.tabs button {
  flex: 0 0 auto;
  font: inherit;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  padding: 10px 10px 9px;
  border: 1px solid var(--line);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  background: var(--surface-2);
  color: var(--ink-soft);
  cursor: pointer;
  position: relative;
  top: 2px;
}

nav.tabs button.active {
  background: var(--surface);
  color: var(--accent-ink);
  border-color: var(--line);
  top: 0;
  box-shadow: 0 -2px 8px var(--shadow);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px 14px 14px 14px;
  padding: 20px 18px;
  box-shadow: 0 10px 24px -14px var(--shadow);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent,
    transparent 27px,
    var(--surface-2) 28px
  );
  background-attachment: local;
}

.chiprow {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.chip {
  font: inherit;
  font-size: 12.5px;
  font-family: 'IBM Plex Mono', monospace;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink-soft);
  cursor: pointer;
}

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

.meta {
  text-align: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  margin-bottom: 14px;
}

.card {
  perspective: 1200px;
  height: 230px;
  margin-bottom: 18px;
  cursor: pointer;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.45s cubic-bezier(0.2, 0.7, 0.3, 1);
  transform-style: preserve-3d;
}

.card.flipped .card-inner {
  transform: rotateY(180deg);
}

.face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 4px 14px 14px 14px;
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 20px;
  text-align: center;
}

.face::before,
.face::after {
  content: '';
  position: absolute;
  left: 14px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--line);
}
.face::before {
  top: 14px;
}
.face::after {
  bottom: 14px;
}

.face.front {
  background: var(--accent-soft);
}
.face.back {
  background: var(--good-soft);
  transform: rotateY(180deg);
}

.level-badge {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink-soft);
}

.face.front h2 {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 34px;
  font-weight: 700;
  margin: 0;
  word-break: break-word;
}

.face.back h3 {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 24px;
  margin: 0;
}

.hint {
  font-size: 12.5px;
  color: var(--ink-soft);
}
.example {
  font-size: 13.5px;
  color: var(--ink-soft);
  max-width: 92%;
}

.answer-row,
.setup-row {
  display: flex;
  gap: 10px;
}

button.btn {
  flex: 1;
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  padding: 13px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-good {
  background: var(--good-soft);
  color: var(--good);
  border-color: var(--good);
}
.btn-bad {
  background: var(--bad-soft);
  color: var(--bad);
  border-color: var(--bad);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-ghost {
  background: var(--bg);
  color: var(--ink-soft);
  border-color: var(--line);
}
.btn-ghost:disabled {
  opacity: 0.4;
  cursor: default;
}
.nav-row {
  margin-bottom: 10px;
}

.empty {
  text-align: center;
  padding: 30px 10px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  color: var(--ink-soft);
}

.quiz-word {
  text-align: center;
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 4px;
  word-break: break-word;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 16px 0;
}

.option {
  font: inherit;
  font-size: 14.5px;
  text-align: left;
  padding: 13px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
}
.option:disabled {
  cursor: default;
}
.option.correct {
  background: var(--good-soft);
  border-color: var(--good);
  color: var(--good);
}
.option.wrong {
  background: var(--bad-soft);
  border-color: var(--bad);
  color: var(--bad);
}
.option-idk {
  font-style: italic;
  color: var(--ink-soft);
  border-style: dashed;
}

.score {
  text-align: center;
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 30px;
  font-weight: 700;
  color: var(--accent-ink);
  margin: 6px 0 18px;
}

.wrong-list {
  margin-bottom: 18px;
}
.wrong-list h3 {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 16px;
  margin: 0 0 6px;
}
.wrong-list ul {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.wrong-list li {
  padding: 9px 12px;
  border-radius: 8px;
  background: var(--bad-soft);
  color: var(--bad);
  font-size: 13.5px;
}

.quiz-important {
  margin-top: 18px;
}
.quiz-important h3 {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 15px;
  margin: 0 0 6px;
  color: var(--ink-soft);
}
.important-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.important-list li {
  padding: 9px 12px;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  font-size: 13.5px;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.search,
.select {
  font: inherit;
  font-size: 13.5px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
}
.search {
  flex: 2;
  min-width: 130px;
}
.select {
  flex: 1;
  min-width: 100px;
}
.reset-btn {
  flex: 1 1 100%;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--bad);
  background: var(--bad-soft);
  color: var(--bad);
  cursor: pointer;
}

.reset-confirm {
  flex: 1 1 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--bad);
  background: var(--bad-soft);
  color: var(--bad);
  font-size: 13px;
}
.reset-confirm-actions {
  display: flex;
  gap: 8px;
}
.reset-confirm-actions .btn {
  padding: 9px;
  font-size: 13px;
}

.full-width {
  width: 100%;
  margin-top: 8px;
}

.manage-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 14px;
}
.manage-card h3 {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 15px;
  margin: 0 0 10px;
}
.manage-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}
.manage-card-head h3 {
  margin: 0;
}
.manage-row2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.bulk-textarea {
  width: 100%;
  min-height: 90px;
  font: inherit;
  font-size: 13.5px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  resize: vertical;
}

.btn-small-primary {
  font: inherit;
  font-size: 12.5px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent-ink);
  cursor: pointer;
  white-space: nowrap;
}

.inline-form {
  flex: 1 1 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cat-group {
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--surface);
}
.cat-group:last-child {
  margin-bottom: 0;
}
.cat-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  background: var(--accent-soft);
  cursor: pointer;
}
.cat-title {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-ink);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cat-count {
  font-size: 11.5px;
  color: var(--ink-soft);
  flex-shrink: 0;
}
.cat-caret {
  font-size: 12px;
  color: var(--ink-soft);
  flex-shrink: 0;
}
.cat-rename-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 14px;
  background: var(--accent-soft);
}
.cat-rename-row .setup-row,
.cat-rename-row {
  align-items: stretch;
}
.cat-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  padding: 10px 14px 0;
}
.btn-tiny {
  font: inherit;
  font-size: 11.5px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink-soft);
  cursor: pointer;
}
.btn-tiny.danger {
  border-color: var(--bad);
  color: var(--bad);
}
.btn-small-inline {
  flex: 1;
  padding: 9px;
  font-size: 13px;
}
.cat-body {
  padding: 10px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.cat-word-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.cat-word-row:last-child {
  border-bottom: none;
}
.cat-word-main {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 90px;
}
.cat-word-main b {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 14px;
}
.cat-word-ko {
  font-size: 12.5px;
  color: var(--ink-soft);
}
.cat-move-select {
  font: inherit;
  font-size: 11.5px;
  padding: 5px 6px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  max-width: 120px;
}
.cat-word-row .del {
  font: inherit;
  font-size: 11.5px;
  font-weight: 600;
  padding: 5px 8px;
  border-radius: 6px;
  border: 1px solid var(--bad);
  background: var(--bad-soft);
  color: var(--bad);
  cursor: pointer;
}

.wlist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
  max-height: 420px;
  overflow-y: auto;
}
.wrow {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
}
.wmain {
  display: flex;
  flex-direction: column;
  min-width: 84px;
}
.wmain b {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 15px;
}
.wlevel {
  font-size: 10.5px;
  color: var(--ink-soft);
  font-family: 'IBM Plex Mono', monospace;
}
.wko {
  flex: 1;
  font-size: 13.5px;
  color: var(--ink-soft);
}
.badge {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  padding: 4px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.badge.new {
  background: var(--surface-2);
  color: var(--ink-soft);
}
.badge.learning {
  background: var(--bad-soft);
  color: var(--bad);
}
.badge.known {
  background: var(--good-soft);
  color: var(--good);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 16px 0;
}
.stat-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--bg);
}
.stat-num {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 25px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.stat-lbl {
  font-size: 11.5px;
  color: var(--ink-soft);
}
.stat-card.good .stat-num {
  color: var(--good);
}
.stat-card.bad .stat-num {
  color: var(--bad);
}

.pbar-o {
  width: 100%;
  height: 9px;
  border-radius: 999px;
  background: var(--line);
  overflow: hidden;
  margin-top: 8px;
}
.pbar-i {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s ease;
}

.quiz-stat {
  margin-top: 20px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  font-size: 14px;
}
.quiz-stat h3 {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 16px;
  margin: 0 0 6px;
}

.write-prompt {
  text-align: center;
  padding: 20px 10px;
  margin-bottom: 14px;
  border-radius: 4px 14px 14px 14px;
  background: var(--accent-soft);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.write-ko {
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
  font-size: 26px;
  margin: 0;
  word-break: break-word;
}

.write-input {
  width: 100%;
  font: inherit;
  font-size: 16px;
  padding: 13px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  margin-bottom: 12px;
}
.write-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.write-input.correct {
  border-color: var(--good);
  background: var(--good-soft);
  color: var(--good);
}
.write-input.wrong {
  border-color: var(--bad);
  background: var(--bad-soft);
  color: var(--bad);
}

.write-feedback {
  text-align: center;
  font-weight: 600;
  font-size: 14px;
  margin: 0 0 12px;
}
.write-feedback.good {
  color: var(--good);
}
.write-feedback.bad {
  color: var(--bad);
}

.day-progress-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 260px;
  overflow-y: auto;
}
.day-progress-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.day-progress-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--ink-soft);
  width: 48px;
  flex-shrink: 0;
}
.day-progress-pct {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--ink-soft);
  width: 36px;
  text-align: right;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.pbar-o.small {
  height: 6px;
  margin-top: 0;
}

h2 {
  margin: 0 0 6px;
  font-family: 'Bricolage Grotesque', system-ui, sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .card-inner {
    transition: none;
  }
}