:root {
  color-scheme: light;
  --bg: #f2efe8;
  --panel: #fffdf9;
  --panel-soft: #faf7f1;
  --line: #ddd5ca;
  --text: #1c1a17;
  --muted: #625b51;
  --accent: #173f36;
  --accent-soft: #e5efe5;
  --focus-soft: #f6e4bf;
  --challenge-soft: #ead8cf;
  --review-soft: #dde8f1;
  --warning-soft: #f9ebc7;
  --success-soft: #e4f0e5;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: Inter, "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100vh;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  text-decoration: none;
}

button:focus-visible,
textarea:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

code {
  font-family: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
}

.hidden {
  display: none !important;
}

.app-shell {
  min-height: 100vh;
}

.empty-state {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.empty-card,
.panel,
.side-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.empty-card {
  max-width: 760px;
  padding: 2rem;
}

.eyebrow,
.section-title,
.panel-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0;
}

.empty-card h1,
.topbar h1 {
  margin: 0.35rem 0 0.6rem;
}

.empty-card p,
.topbar p,
.point-copy,
#hint-text,
#explanation-text {
  color: var(--muted);
  line-height: 1.6;
}

.setup-list {
  margin: 1.5rem 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
}

.empty-actions {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.drop-zone {
  margin-top: 1.25rem;
  padding: 1.2rem;
  border: 2px dashed #b6a99a;
  border-radius: 8px;
  background: var(--panel-soft);
  transition: border-color 140ms ease, background 140ms ease;
}

.drop-zone.compact {
  margin-top: 0.75rem;
  padding: 0.85rem;
}

.drop-zone.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop-title {
  font-weight: 700;
}

.drop-copy {
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.server-controls,
.sidebar-server-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.server-controls {
  margin-top: 1rem;
}

.sidebar-server-controls {
  display: grid;
}

.server-status {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 2.25rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.server-status.ready {
  border-color: #94b398;
  background: var(--success-soft);
  color: #1b4a2b;
}

.server-status.warning {
  border-color: #e0c36c;
  background: var(--warning-soft);
  color: #73500b;
}

.server-status.offline {
  border-color: #d3b4a9;
  background: var(--challenge-soft);
  color: #6d392f;
}

.ocr-status {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 20;
  max-width: min(28rem, calc(100vw - 2rem));
  min-width: min(24rem, calc(100vw - 2rem));
  padding: 0.85rem 1rem;
  border: 1px solid #94b398;
  border-radius: 8px;
  background: var(--accent);
  color: #f7f3ea;
  font-weight: 700;
  box-shadow: 0 12px 28px rgba(28, 26, 23, 0.18);
}

.ocr-status-text {
  margin-bottom: 0.55rem;
}

.ocr-progress-track {
  height: 0.55rem;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(247, 243, 234, 0.25);
}

.ocr-progress-fill {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: #f7f3ea;
  transition: width 180ms ease;
}

.ocr-status.indeterminate .ocr-progress-fill {
  width: 35%;
  animation: ocr-progress-slide 1.1s ease-in-out infinite;
}

.ocr-status-detail {
  margin-top: 0.5rem;
  color: rgba(247, 243, 234, 0.82);
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.4;
}

@keyframes ocr-progress-slide {
  0% {
    transform: translateX(-120%);
  }

  100% {
    transform: translateX(300%);
  }
}

.file-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.file-button input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.primary-button,
.secondary-button,
.launcher-button,
.lesson-tile,
.filter-chip,
.mode-button {
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  padding: 0.72rem 0.95rem;
  font-weight: 600;
}

.launcher-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.primary-button {
  background: var(--accent);
  color: #f7f3ea;
  border-color: var(--accent);
}

.study-ui {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 320px;
}

.lesson-sidebar,
.study-panel {
  background: var(--panel-soft);
  padding: 1.5rem;
}

.lesson-sidebar {
  border-right: 1px solid var(--line);
}

.study-panel {
  border-left: 1px solid var(--line);
}

.study-main {
  padding: 2rem;
  display: grid;
  gap: 1.2rem;
  align-content: start;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.2rem;
}

.brand-mark {
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 700;
  background: #cde2cf;
  color: var(--accent);
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.sidebar-load {
  width: 100%;
  margin-top: 0.55rem;
}

.sidebar-section {
  margin-top: 1.5rem;
}

.lesson-list,
.filter-list,
.point-list,
.vocabulary-list,
.badge-list,
.metric-grid {
  display: grid;
  gap: 0.75rem;
}

.lesson-tile {
  width: 100%;
  text-align: left;
  background: var(--panel);
}

.lesson-tile.active {
  background: var(--accent-soft);
  border-color: #94b398;
}

.lesson-title {
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.lesson-meta {
  color: var(--muted);
  font-size: 0.85rem;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

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

.filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #f7f3ea;
}

.mode-switch {
  display: inline-flex;
  width: fit-content;
  padding: 0.25rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  gap: 0.25rem;
}

.mode-button {
  border-color: transparent;
  background: transparent;
  padding: 0.62rem 0.9rem;
}

.mode-button.active {
  background: var(--accent);
  color: #f7f3ea;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
}

.topbar h1 {
  font-size: clamp(1.9rem, 2vw, 2.4rem);
}

.topbar-actions,
.answer-actions,
.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.progress-block {
  display: grid;
  gap: 0.55rem;
  align-content: start;
}

.progress-copy {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.progress-track {
  height: 0.72rem;
  border-radius: 999px;
  background: var(--line);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent) 0%, #90b98a 100%);
}

.exercise-surface {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.flashcard-surface {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.cheat-sheet-surface {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.cheat-section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.cheat-section-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
  padding: 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel-soft);
}

.cheat-section h2 {
  margin: 0.2rem 0 0;
  font-size: 1.15rem;
}

.cheat-count {
  color: var(--muted);
  font-size: 0.88rem;
  white-space: nowrap;
}

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

.cheat-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.cheat-table th,
.cheat-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.cheat-table th {
  color: var(--muted);
  font-size: 0.74rem;
  text-transform: uppercase;
  background: #f8f4ed;
}

.cheat-table td {
  line-height: 1.55;
}

.table-badge {
  display: inline-flex;
  padding: 0.22rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--accent-soft);
  font-size: 0.78rem;
  font-weight: 700;
}

.flashcard-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.flashcard-progress {
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.flashcard-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.flashcard {
  min-height: 18rem;
  display: grid;
  align-content: center;
  gap: 1rem;
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.flashcard-kind {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.flashcard-front {
  font-size: 2.4rem;
  line-height: 1.35;
  font-weight: 700;
}

.flashcard-back {
  max-width: 72ch;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.65;
}

.flashcard-answer {
  color: var(--text);
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.flashcard-row {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr);
  gap: 1rem;
  align-items: baseline;
  margin-top: 0.45rem;
}

.flashcard-row span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.flashcard-row strong {
  color: var(--text);
  font-size: 1.18rem;
}

.exercise-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.exercise-source {
  color: var(--muted);
  font-size: 0.88rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.35rem 0.62rem;
  background: #f3efe7;
  border: 1px solid var(--line);
  font-size: 0.78rem;
}

.badge.type {
  background: var(--accent-soft);
}

.badge.focus {
  background: var(--focus-soft);
}

.badge.challenge {
  background: var(--challenge-soft);
}

.badge.review {
  background: var(--review-soft);
}

.panel {
  padding: 1.1rem;
}

.prompt-text,
.answer-text,
.pronunciation-text,
.english-answer-text {
  margin-top: 0.6rem;
  font-size: 1.42rem;
  line-height: 1.65;
}

.pronunciation-text,
.english-answer-text {
  font-size: 1.08rem;
  color: var(--muted);
}

.answer-input {
  width: 100%;
  min-height: 8.5rem;
  margin-top: 0.65rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  resize: vertical;
  line-height: 1.6;
}

.feedback-banner {
  margin-top: 0.95rem;
  padding: 0.82rem 1rem;
  border-radius: 8px;
  font-weight: 600;
}

.feedback-banner.neutral {
  background: #eee7dc;
  color: #544d43;
}

.feedback-banner.success {
  background: var(--success-soft);
  color: #1b4a2b;
}

.feedback-banner.warning {
  background: var(--warning-soft);
  color: #73500b;
}

.review-panel {
  display: grid;
  gap: 0.75rem;
}

.review-actions {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.6rem;
}

.review-button {
  min-height: 2.6rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  color: var(--text);
  font-weight: 700;
}

.review-button.again {
  background: var(--challenge-soft);
}

.review-button.hard {
  background: var(--warning-soft);
}

.review-button.good {
  background: var(--success-soft);
}

.review-button.easy {
  background: var(--review-soft);
}

.review-summary {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.side-card {
  padding: 1rem;
  margin-bottom: 1rem;
}

.metric-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 0.85rem;
}

.metric-card,
.point-card,
.vocab-chip {
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #f8f4ed;
  padding: 0.82rem;
}

.metric-value {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
}

.metric-label,
.vocab-reading {
  color: var(--muted);
}

.point-card {
  background: #fbf4df;
  border-color: #ecd9a4;
}

.point-title,
.vocab-term {
  font-weight: 700;
  margin-bottom: 0.35rem;
}

@media (max-width: 1180px) {
  .study-ui {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .study-panel {
    grid-column: 1 / -1;
    border-left: none;
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 840px) {
  .study-ui {
    grid-template-columns: 1fr;
  }

  .lesson-sidebar,
  .study-panel {
    border: none;
    border-bottom: 1px solid var(--line);
  }

  .topbar,
  .flashcard-toolbar,
  .cheat-section-header,
  .exercise-header,
  .progress-copy {
    display: grid;
  }
}