:root {
  --kumon-blue: #0057b8;
  --kumon-blue-dark: #003f86;
  --kumon-yellow: #f7c948;
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --ok: #2f9e44;
  --pending: #f08c00;
  --done: #1971c2;
  --danger: #e03131;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(0, 43, 99, 0.08);
}

/* ── Dark Theme ── */
[data-theme="dark"] {
  --bg: #0f1117;
  --card: #1a1d27;
  --text: #e8eaf0;
  --muted: #9aa3b0;
  --kumon-blue: #4a90d9;
  --kumon-blue-dark: #2d6eb3;
  --ok: #4caf7d;
  --pending: #f0a140;
  --done: #5ba3e0;
  --danger: #e05c5c;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}
[data-theme="dark"] body {
  background: radial-gradient(circle at top right, #1a2233, transparent 40%), var(--bg);
}
[data-theme="dark"] .reading-option,
[data-theme="dark"] .stat-char-btn,
[data-theme="dark"] .reset-checkbox {
  border-color: #2d3245;
}
[data-theme="dark"] .reading-option:hover,
[data-theme="dark"] .stat-char-btn:hover {
  background: #22263a;
  border-color: var(--kumon-blue);
}
[data-theme="dark"] .progress-bar {
  background: #2d3245;
}
[data-theme="dark"] input,
[data-theme="dark"] select {
  background: #22263a;
  color: var(--text);
  border-color: #2d3245;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top right, #dbeafe, transparent 40%), var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-text-size-adjust: 100%;
}

#app {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(120deg, var(--kumon-blue), var(--kumon-blue-dark));
  color: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -40px; top: -40px;
  width: 180px; height: 180px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
}
.hero-title {
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  line-height: 1.2;
}
.hero-sub {
  margin-top: 6px;
  color: rgba(255,255,255,0.9);
  font-size: 0.95rem;
}
.hero-stats {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.hero-stat {
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: 10px;
  padding: 8px 14px;
  backdrop-filter: blur(2px);
  font-size: 0.9rem;
}
.hero-stat b { font-size: 1.15rem; display: block; }
/* ── Auth Header Bar ── */
.auth-header-bar {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
}
.btn-auth-header {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 20px;
  background: rgba(255,255,255,0.15);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(4px);
  transition: background 0.2s;
}
.btn-auth-header:hover {
  background: rgba(255,255,255,0.28);
}
.auth-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
}


/* ── Navigation Bar ── */
.nav-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}
.nav-back {
  background: var(--card);
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--kumon-blue);
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #0b3a74;
}

/* ── Cards ── */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}
.card + .card { margin-top: 16px; }
.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #0b3a74;
  margin-bottom: 12px;
}

/* ── Blocks Grid (Dashboard) ── */
.blocks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}
.block-card {
  background: var(--card);
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  padding: 14px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  text-align: center;
}
.block-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.08);
}
.block-card.available { border-color: var(--ok); }
.block-card.in_progress { border-color: var(--kumon-yellow); }
.block-card.completed { border-color: var(--done); background: #f0f7ff; }
.block-card.locked { opacity: 0.5; cursor: default; }
.block-card.locked:hover { transform: none; box-shadow: none; }
.block-num {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--kumon-blue);
}
.block-chars {
  font-size: 1.1rem;
  margin: 6px 0;
  letter-spacing: 2px;
}
.block-status {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 3px 8px;
  border-radius: 999px;
  display: inline-block;
}
.block-status.locked { background: #f1f3f5; color: var(--muted); }
.block-status.available { background: #e6fcf5; color: var(--ok); }
.block-status.in_progress { background: #fff4e6; color: var(--pending); }
.block-status.completed { background: #e7f5ff; color: var(--done); }

/* ── Progress Bar ── */
.progress-bar {
  height: 12px;
  background: #e9ecef;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 6px;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--kumon-yellow), #fab005);
  border-radius: 999px;
  transition: width 0.4s ease;
}

/* ── Worksheets List ── */
.ws-list { list-style: none; display: grid; gap: 8px; }
.ws-item {
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  transition: transform 0.12s, box-shadow 0.12s;
  cursor: pointer;
}
.ws-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.ws-info { flex: 1; }
.ws-info strong { font-size: 0.95rem; }
.ws-info .ws-desc { font-size: 0.82rem; color: var(--muted); margin-top: 2px; }
.ws-score {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
}
.ws-score.perfect { background: #e6fcf5; color: var(--ok); }
.ws-score.partial { background: #fff4e6; color: var(--pending); }
.ws-score.none { background: #f1f3f5; color: var(--muted); }

/* ── Buttons ── */
button {
  border: 0;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}
button:active { opacity: 0.8; }
.btn-primary { background: var(--kumon-blue); color: #fff; }
.btn-secondary { background: #edf2ff; color: #364fc7; }
.btn-danger { background: #fff5f5; color: var(--danger); }
.btn-icon {
  background: transparent;
  padding: 8px;
  font-size: 1.2rem;
  line-height: 1;
  border-radius: 50%;
}
.btn-icon:hover { background: rgba(0,0,0,0.05); }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Worksheet Page ── */
.ws-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.ws-timer {
  font-size: 1.3rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--kumon-blue);
}
.ws-side-toggle {
  display: flex;
  gap: 0;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid var(--kumon-blue);
}
.ws-side-btn {
  padding: 6px 16px;
  font-weight: 700;
  border-radius: 0;
  background: transparent;
  color: var(--kumon-blue);
}
.ws-side-btn.active {
  background: var(--kumon-blue);
  color: #fff;
}

/* ── Exercise Area ── */
.exercise-area {
  min-height: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.char-display {
  font-size: 6rem;
  font-weight: 300;
  line-height: 1;
  color: #0b3a74;
  font-family: "Hiragino Kaku Gothic Pro", "Yu Gothic", "Noto Sans JP", sans-serif;
}
.char-label {
  font-size: 1rem;
  color: var(--muted);
}
.speak-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.speak-buttons .btn-icon {
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--card-bg);
  border: 1px solid #d0d7de;
}

/* ── Canvas Drawing ── */
.canvas-wrap {
  position: relative;
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1;
  background: #fff;
  border: 2px solid #d0d7de;
  border-radius: 12px;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}
.canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}
.canvas-guide {
  position: absolute;
  inset: 0;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}
.canvas-guide-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.canvas-guide-lines::before,
.canvas-guide-lines::after {
  content: "";
  position: absolute;
  background: #e9ecef;
}
.canvas-guide-lines::before {
  left: 50%; top: 5%; bottom: 5%;
  width: 1px;
}
.canvas-guide-lines::after {
  top: 50%; left: 5%; right: 5%;
  height: 1px;
}
.canvas-guide-char {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: min(70vw, 260px);
  font-family: "Hiragino Kaku Gothic Pro", "Yu Gothic", "Noto Sans JP", serif;
  color: rgba(0, 0, 0, 0.08);
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
  line-height: 1;
}

/* ── Exercise Dual Layout (animation + canvas side by side) ── */
.exercise-dual {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  width: 100%;
  max-width: 640px;
}
.exercise-dual-anim {
  flex: 0 0 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.exercise-dual-canvas {
  flex: 1;
  min-width: 0;
}
.exercise-dual-canvas .canvas-wrap {
  max-width: 100%;
}
@media (max-width: 500px) {
  .exercise-dual {
    flex-direction: column;
    align-items: center;
  }
  .exercise-dual-anim {
    flex: none;
    width: 140px;
  }
  .exercise-dual-canvas {
    width: 100%;
  }
}

/* ── Vocab image inline (below animation in exercise-dual) ── */
.vocab-img-inline {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 8px;
  gap: 4px;
}
.vocab-img-inline img {
  width: 100px;
  height: 100px;
  object-fit: contain;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  background: #fff;
}
.vocab-img-word {
  font-size: 0.8rem;
  color: rgba(0, 0, 0, 0.55);
  text-align: center;
}
@media (max-width: 500px) {
  .vocab-img-inline img {
    width: 80px;
    height: 80px;
  }
}

/* ── Stroke Animation Modal ── */
.anim-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.anim-modal {
  background: var(--bg);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}
.anim-char-label {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
}

/* ── Practice Page ── */
.char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
  gap: 6px;
}
.char-btn {
  aspect-ratio: 1;
  font-size: 1.4rem;
  font-family: "Hiragino Kaku Gothic Pro", "Yu Gothic", "Noto Sans JP", sans-serif;
  background: var(--card);
  border: 2px solid #e5e7eb;
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.char-btn:hover { border-color: var(--kumon-blue); }
.char-btn.active {
  border-color: var(--kumon-blue);
  background: #edf2ff;
}

/* ── Reading Exercise ── */
.reading-options {
  display: grid;
  gap: 10px;
  width: 100%;
  max-width: 400px;
}
.reading-option {
  padding: 14px 18px;
  background: var(--card);
  border: 2px solid #e5e7eb;
  border-radius: 10px;
  font-size: 1.1rem;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.reading-option:hover { border-color: var(--kumon-blue); }
.reading-option.correct {
  border-color: var(--ok);
  background: #e6fcf5;
}
.reading-option.kb-selected { border-color: var(--kumon-blue); background: rgba(0,87,184,0.08); box-shadow: 0 0 0 2px var(--kumon-blue); }
.reading-option.wrong {
  border-color: var(--danger);
  background: #fff5f5;
}

/* ── Feedback Overlay ── */
.feedback {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.4);
  z-index: 100;
  animation: fadeIn 0.2s;
}
.feedback-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  max-width: 360px;
  width: 90%;
  box-shadow: 0 16px 48px rgba(0,0,0,0.15);
}
.feedback-score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--ok);
}
.feedback-msg {
  margin: 8px 0 20px;
  color: var(--muted);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ── Level Tabs (Dashboard) ── */
.level-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.level-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 10px;
  border: 2px solid #e5e7eb;
  border-radius: 10px;
  background: var(--card);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.12s;
  min-width: 60px;
}
.level-tab:hover:not(:disabled) {
  border-color: var(--kumon-blue);
  transform: translateY(-1px);
}
.level-tab.active {
  border-color: var(--kumon-blue);
  background: #edf2ff;
}
.level-tab.locked {
  opacity: 0.4;
  cursor: default;
}
.level-tab.available { border-color: var(--ok); }
.level-tab.in_progress { border-color: var(--kumon-yellow); }
.level-tab.completed { border-color: var(--done); background: #f0f7ff; }
.level-tab-id {
  font-size: 1rem;
  font-weight: 800;
  color: var(--kumon-blue);
}
.level-tab-title {
  font-size: 0.65rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.2;
  max-width: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.level-tab-progress {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--ok);
}

/* ── Level Tabs Mini (Practice) ── */
.level-tabs-mini {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.level-tab-mini {
  padding: 6px 10px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  background: var(--card);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--kumon-blue);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.level-tab-mini:hover:not(:disabled) {
  border-color: var(--kumon-blue);
}
.level-tab-mini.active {
  border-color: var(--kumon-blue);
  background: var(--kumon-blue);
  color: #fff;
}
.level-tab-mini.locked {
  opacity: 0.3;
  cursor: default;
}

/* ── Utilities ── */
.mt-4 { margin-top: 4px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.text-center { text-align: center; }
.text-muted { color: var(--muted); font-size: 0.88rem; }
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── Gojūon Grid (kana selector, right-to-left columns) ── */
.gojuon-grid {
  display: grid;
  direction: rtl;
  gap: 4px;
}
.gojuon-grid > * {
  direction: ltr;
}
.gojuon-empty {
  aspect-ratio: 1;
}

/* ── Reset Modal Checkboxes ── */
.reset-checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  margin-bottom: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.15s, border-color 0.15s;
}
.reset-checkbox:hover {
  background: #fff5f5;
  border-color: var(--danger);
}
.reset-checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--danger);
  cursor: pointer;
}

/* ── Stats Screen ── */
.stat-chars-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.stat-char-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px 6px;
  min-width: 56px;
  border: 1.5px solid #e5e7eb;
  border-radius: 10px;
  background: var(--card);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.stat-char-btn:hover {
  border-color: var(--kumon-blue);
  background: #edf2ff;
}
.stat-char {
  font-size: 1.5rem;
  line-height: 1;
}
.stat-written {
  font-size: 0.7rem;
  color: var(--muted);
  font-weight: 600;
}
.stat-score {
  font-size: 0.65rem;
  font-weight: 700;
}
.stat-srs-due {
  font-size: 0.5rem;
  color: var(--pending);
  line-height: 1;
}

/* ── Reward Animation ── */
@keyframes rewardFadeIn {
  from { opacity: 0; transform: scale(0.8); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes rewardFadeOut {
  from { opacity: 1; }
  to   { opacity: 0; }
}
@keyframes starBounce {
  0%   { transform: scale(1) rotate(0deg); }
  25%  { transform: scale(1.3) rotate(-5deg); }
  50%  { transform: scale(1.1) rotate(5deg); }
  75%  { transform: scale(1.25) rotate(-3deg); }
  100% { transform: scale(1) rotate(0deg); }
}
.reward-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 43, 99, 0.55);
  animation: rewardFadeIn 0.3s ease;
}
.reward-overlay.fade-out {
  animation: rewardFadeOut 0.4s ease forwards;
}
.reward-content {
  background: var(--card);
  border-radius: 24px;
  padding: 40px 48px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.reward-stars {
  font-size: 3.5rem;
  display: block;
  margin-bottom: 16px;
  animation: starBounce 0.6s ease 0.2s;
}
.reward-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--kumon-blue);
  margin-bottom: 6px;
}
.reward-sub {
  font-size: 1rem;
  color: var(--muted);
}

/* ── Weekly Goal ── */
.weekly-goal-bar {
  margin-top: 10px;
}
.weekly-goal-label {
  font-size: 0.82rem;
  opacity: 0.85;
  margin-bottom: 4px;
}
.weekly-progress-bar {
  height: 6px;
  border-radius: 3px;
  background: rgba(255,255,255,0.25);
  overflow: hidden;
}
.weekly-progress-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--kumon-yellow);
  transition: width 0.4s ease;
}

/* ── Theme Toggle Button ── */
.theme-toggle {
  position: absolute;
  top: 14px;
  right: 14px;
  background: rgba(255,255,255,0.18);
  border: none;
  border-radius: 50%;
  width: 38px;
  height: 38px;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  z-index: 2;
}
.theme-toggle:hover {
  background: rgba(255,255,255,0.32);
}

/* ── Write History Grid ── */
.write-history-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.write-history-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.write-history-item img {
  width: 64px;
  height: 64px;
  border-radius: 8px;
  border: 1.5px solid #e5e7eb;
  object-fit: contain;
  background: #fff;
}
.write-history-char {
  font-size: 0.72rem;
  color: var(--muted);
}

/* ── Settings Card ── */
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid #f0f2f6;
  gap: 12px;
}
.settings-row:last-child {
  border-bottom: none;
}
.settings-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}
.settings-desc {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 2px;
}
input[type="range"].settings-range {
  accent-color: var(--kumon-blue);
  width: 90px;
}
input[type="time"].settings-time {
  border: 1.5px solid #e5e7eb;
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 0.9rem;
  background: var(--card);
  color: var(--text);
}
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider {
  position: absolute;
  inset: 0;
  background: #cdd3db;
  border-radius: 24px;
  cursor: pointer;
  transition: background 0.2s;
}
.toggle-slider::before {
  content: "";
  position: absolute;
  left: 3px; top: 3px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s;
}
.toggle-switch input:checked + .toggle-slider {
  background: var(--kumon-blue);
}
.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* ── Toggle Small (inline beside titles) ── */
.toggle-row-inline {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}
.toggle-label-sm {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
}
.toggle-switch-sm {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
  flex-shrink: 0;
}
.toggle-switch-sm input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider-sm {
  position: absolute;
  inset: 0;
  background: #cdd3db;
  border-radius: 20px;
  cursor: pointer;
  transition: background 0.2s;
}
.toggle-slider-sm::before {
  content: "";
  position: absolute;
  left: 2px; top: 2px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.2s;
}
.toggle-switch-sm input:checked + .toggle-slider-sm {
  background: var(--kumon-blue);
}
.toggle-switch-sm input:checked + .toggle-slider-sm::before {
  transform: translateX(16px);
}

/* ── Parent Header ── */
.parent-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

/* ── Subscription Banner (top bar) ── */
.subscription-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  margin: 12px 0;
  border-radius: 10px;
  font-size: 0.9rem;
}
.subscription-banner--active {
  background: color-mix(in srgb, var(--ok) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--ok) 25%, transparent);
  color: var(--text);
}
.subscription-banner--inactive {
  background: color-mix(in srgb, var(--kumon-blue) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--kumon-blue) 25%, transparent);
  color: var(--text);
}
.btn-banner {
  border: none;
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-banner--primary {
  background: var(--kumon-blue);
  color: #fff;
  border-color: var(--kumon-blue);
}
.btn-banner--danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
  font-size: 0.75rem;
}
.btn-banner:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.banner-buttons {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ── Subscription Status (parent view) ── */
.subscription-status {
  padding: 16px;
  border-radius: 12px;
  text-align: center;
}
.subscription-status--active {
  background: color-mix(in srgb, var(--ok) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--ok) 25%, transparent);
}
.subscription-status--inactive {
  background: color-mix(in srgb, var(--muted) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--muted) 20%, transparent);
}

/* ── Parent Report ── */
.parent-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.parent-stat-item {
  background: var(--bg);
  border-radius: 12px;
  padding: 14px 12px;
  text-align: center;
}
.parent-stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--kumon-blue);
  line-height: 1;
  margin-bottom: 4px;
}
.parent-stat-label {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 600;
}

/* ── Vocab Image Exercise ── */
.vocab-img-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 8px auto 16px;
  max-width: 260px;
  width: 100%;
}
.vocab-img {
  width: 100%;
  max-width: 240px;
  height: auto;
  border-radius: 12px;
  border: 2px solid #e8eaf0;
  background: #fff;
  display: block;
}

/* ── Reading Passage ── */
.reading-text {
  font-size: 1.15rem;
  line-height: 1.9;
  padding: 16px;
  background: var(--bg);
  border-radius: 12px;
  margin-bottom: 16px;
  white-space: pre-wrap;
}

/* ── Toast Notifications ── */
#toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 10001;
  max-width: 400px;
  width: calc(100% - 32px);
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  background: var(--card);
  border-left: 4px solid var(--muted);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  pointer-events: auto;
  opacity: 0;
  transform: translateX(40px);
  transition: none;
  font-size: 0.85rem;
  color: var(--text);
}
.toast--visible {
  opacity: 1;
  transform: translateX(0);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.toast--removing {
  animation: toastFadeOut 0.3s ease forwards;
}
@keyframes toastFadeOut {
  to { opacity: 0; transform: translateX(40px); }
}
.toast--error  { border-left-color: var(--danger); }
.toast--warning { border-left-color: var(--pending); }
.toast--info   { border-left-color: var(--kumon-blue); }
.toast--success { border-left-color: var(--ok); }
.toast-icon {
  flex-shrink: 0;
  font-size: 1.1rem;
  line-height: 1.4;
}
.toast--error .toast-icon  { color: var(--danger); }
.toast--warning .toast-icon { color: var(--pending); }
.toast--info .toast-icon   { color: var(--kumon-blue); }
.toast--success .toast-icon { color: var(--ok); }
.toast-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.toast-title {
  font-weight: 700;
  line-height: 1.4;
}
.toast-message {
  color: var(--muted);
  line-height: 1.4;
  word-break: break-word;
}
.toast-actions {
  display: flex;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}
.toast-btn {
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: 6px;
  border: 1px solid var(--muted);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s;
}
.toast-btn:hover { background: var(--bg); }
.toast-close {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 0 2px;
  line-height: 1.4;
  transition: color 0.15s;
}
.toast-close:hover { color: var(--text); }

/* ── Admin Modal ── */
.admin-section {
  border: 1px solid #e0e4ea;
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 12px;
  text-align: left;
}
[data-theme="dark"] .admin-section { border-color: #2d3245; }
.admin-section-title {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.admin-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  padding: 3px 0;
}
.admin-row-label { color: var(--muted); }
.admin-row-value { font-weight: 600; }
.admin-btn-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 16px 0 8px;
}
.admin-btn-group .btn-primary,
.admin-btn-group .btn-secondary,
.admin-btn-group .btn-danger { width: 100%; }
.admin-diag-table {
  width: 100%;
  font-size: 0.75rem;
  border-collapse: collapse;
  margin-top: 8px;
}
.admin-diag-table th {
  text-align: left;
  font-weight: 600;
  padding: 4px 6px;
  border-bottom: 1px solid #e0e4ea;
  color: var(--muted);
}
[data-theme="dark"] .admin-diag-table th { border-color: #2d3245; }
.admin-diag-table td {
  padding: 3px 6px;
  border-bottom: 1px solid #f0f2f5;
  word-break: break-all;
}
[data-theme="dark"] .admin-diag-table td { border-color: #1e2133; }
.admin-diag-section {
  max-height: 300px;
  overflow-y: auto;
  margin-top: 12px;
  border: 1px solid #e0e4ea;
  border-radius: 8px;
  padding: 8px;
}
[data-theme="dark"] .admin-diag-section { border-color: #2d3245; }

/* ── Login Screen ── */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 20px;
}
.login-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 32px;
  text-align: center;
  max-width: 380px;
  width: 100%;
}
.login-logo {
  font-size: 3.5rem;
  margin-bottom: 12px;
}
.login-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--kumon-blue);
  margin: 0 0 4px;
}
.login-subtitle {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 28px;
}
.btn-google {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: #3c4043;
  border: 1px solid #dadce0;
  border-radius: 8px;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
  width: 100%;
}
.btn-google:hover { background: #f7f8fa; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.btn-google:active { background: #eef0f2; }
.btn-google:disabled { opacity: 0.6; cursor: default; }
[data-theme="dark"] .btn-google {
  background: #22263a;
  color: var(--text);
  border-color: #3d4258;
}
[data-theme="dark"] .btn-google:hover { background: #2a2e44; }
.login-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 16px;
  padding: 10px;
  background: rgba(224, 49, 49, 0.08);
  border-radius: 8px;
}
.login-demo-note {
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 24px;
  line-height: 1.4;
}

/* ── Content Gating (block paywall overlay) ── */
.block-card.gated {
  opacity: 0.55;
  cursor: default;
  position: relative;
}
.block-card.gated::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
}
.block-status.gated {
  background: var(--muted);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
}

/* ── User Management ── */

/* Toolbar */
.users-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.view-toggle {
  display: flex;
  gap: 4px;
  background: var(--bg);
  border-radius: 8px;
  padding: 2px;
}
.view-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px 12px;
  height: 30px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s;
}
.view-toggle-btn.active {
  background: var(--card);
  color: var(--kumon-blue);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
[data-theme="dark"] .view-toggle { background: #22263a; }
[data-theme="dark"] .view-toggle-btn.active { background: #2d3245; }

/* Cards view */
.users-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.user-card {
  border: 1px solid #e0e4ea;
  border-radius: 10px;
  padding: 14px;
}
.user-card--clickable {
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.user-card--clickable:hover {
  border-color: var(--kumon-blue);
  box-shadow: 0 2px 8px rgba(0,87,184,0.1);
}
[data-theme="dark"] .user-card { border-color: #2d3245; }
[data-theme="dark"] .user-card--clickable:hover { border-color: var(--kumon-blue); box-shadow: 0 2px 8px rgba(74,144,217,0.15); }
.user-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
}
.user-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid #f0f2f6;
}
[data-theme="dark"] .user-card-footer { border-top-color: #2d3245; }

/* List view */
.users-list-compact {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.user-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s;
}
.user-row:hover { background: var(--bg); }
[data-theme="dark"] .user-row:hover { background: #22263a; }
.user-row-name {
  font-weight: 600;
  font-size: 0.88rem;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 0 0 auto;
  max-width: 120px;
}
.user-row-email {
  font-size: 0.78rem;
  color: var(--muted);
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}
.user-row-login {
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Shared */
.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.user-avatar-placeholder {
  background: var(--kumon-blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.user-info { flex: 1; min-width: 0; }
.user-name { font-weight: 600; font-size: 0.95rem; }
.user-email { font-size: 0.8rem; color: var(--muted); word-break: break-all; }
.user-meta { font-size: 0.75rem; color: var(--muted); margin-top: 2px; }

/* Badges */
.role-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  color: var(--badge-color, var(--muted));
  background: color-mix(in srgb, var(--badge-color, var(--muted)) 12%, transparent);
  white-space: nowrap;
  flex-shrink: 0;
}
.paid-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  white-space: nowrap;
  flex-shrink: 0;
}
.paid-badge--yes { color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); }
.paid-badge--no { color: var(--muted); background: color-mix(in srgb, var(--muted) 10%, transparent); }
.paid-badge--expired { color: var(--danger); background: color-mix(in srgb, var(--danger) 12%, transparent); }

/* Detail modal */
.user-detail-modal {
  max-width: 480px;
  width: 95%;
  max-height: 85vh;
  overflow-y: auto;
  text-align: left;
}
.user-modal-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Modal controls */
.user-role-select, .user-paid-input {
  padding: 6px 8px;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  font-size: 0.85rem;
  background: var(--card);
  color: var(--text);
}
.user-role-select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
[data-theme="dark"] .user-role-select,
[data-theme="dark"] .user-paid-input {
  border-color: #3d4258;
  background: #22263a;
}
.user-clear-paid {
  font-size: 1.1rem;
  color: var(--danger);
  cursor: pointer;
  background: none;
  border: none;
  padding: 2px 6px;
}

/* Children checkboxes */
.user-children-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 4px 0;
}
.user-child-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  cursor: pointer;
}
.user-child-checkbox input { cursor: pointer; }

/* Progress in modal */
.user-progress-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  padding: 8px 0;
}
.user-progress-stat {
  text-align: center;
  flex: 1;
  min-width: 60px;
}
.user-progress-stat-value {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--kumon-blue);
}
.user-progress-stat-label {
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.user-progress-levels {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.user-progress-level {
  padding: 0;
}

/* ══════════════════════════════════════════════════════════════════════
   LANGUAGE MODULE STYLES
   ══════════════════════════════════════════════════════════════════════ */

/* ── Language Switch Bar (top of Japanese dashboard) ── */
.lang-switch-bar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 12px;
}
.btn-lang-switch {
  background: linear-gradient(135deg, #6c5ce7, #4834d4);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.15s;
}
.btn-lang-switch:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* ── Language Selector Grid ── */
.lang-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.lang-card {
  background: var(--card);
  border: 2px solid #e5e7eb;
  border-radius: 14px;
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.lang-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  border-color: #6c5ce7;
}
.lang-card-flag {
  font-size: 3rem;
  margin-bottom: 8px;
}
.lang-card-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}
.lang-card-native {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 2px;
}
.lang-card-progress {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ok);
  margin-top: 8px;
}
.lang-card-action {
  font-size: 0.85rem;
  font-weight: 600;
  color: #6c5ce7;
  margin-top: 8px;
}


/* ── View Toggle ── */
.view-toggle {
  display: flex;
  gap: 2px;
  background: var(--bg);
  border-radius: 8px;
  padding: 2px;
  border: 1px solid var(--border);
}
.view-toggle-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border: none;
  background: transparent;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--muted);
  transition: all 0.15s;
}
.view-toggle-btn.active {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.view-toggle-btn:hover:not(.active) { color: var(--text); }

/* ── Language List View ── */
.lang-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.lang-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card);
  border-radius: 10px;
  padding: 12px 16px;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: transform 0.12s, box-shadow 0.12s;
}
.lang-list-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.lang-list-flag { font-size: 1.6rem; flex-shrink: 0; }
.lang-list-info { flex: 1; min-width: 0; }
.lang-list-name { font-weight: 600; font-size: 0.95rem; color: var(--text); }
.lang-list-native { font-size: 0.78rem; color: var(--muted); }
.lang-list-status { flex-shrink: 0; text-align: right; }
.lang-list-progress { font-weight: 700; color: var(--kumon-blue); font-size: 0.95rem; }
.lang-list-action { font-weight: 600; color: #6c5ce7; font-size: 0.85rem; }


/* UI Language Dropdown */
.ui-lang-dropdown {
  background: rgba(255,255,255,0.2);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  min-width: 52px;
  text-align: center;
}
.ui-lang-dropdown option {
  background: #333;
  color: #fff;
}
.ui-lang-dropdown:hover { background: rgba(255,255,255,0.3); }
.ui-lang-dropdown:focus { box-shadow: 0 0 0 2px rgba(255,255,255,0.4); }

/* ── Exercise Components ── */
.exercise-card {
  background: var(--card);
  border-radius: 14px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.exercise-type-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 3px 10px;
  border-radius: 999px;
  background: #6c5ce7;
  color: #fff;
  margin-bottom: 12px;
}
.exercise-prompt {
  font-size: 1.1rem;
  line-height: 1.5;
  color: var(--text);
  margin-bottom: 12px;
}
.exercise-input-group {
  display: flex;
  gap: 8px;
  align-items: center;
}
.exercise-input {
  flex: 1;
  padding: 10px 14px;
  border: 2px solid #e5e7eb;
  border-radius: 10px;
  font-size: 1rem;
  background: var(--card);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
.exercise-input:focus {
  border-color: #6c5ce7;
}
.exercise-textarea {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid #e5e7eb;
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--card);
  color: var(--text);
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}
.exercise-textarea:focus {
  border-color: #6c5ce7;
}
.exercise-container {
  animation: fadeIn 0.2s ease;
}

/* ── Audio Play Button ── */
.btn-audio-play {
  background: linear-gradient(135deg, #6c5ce7, #4834d4);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}
.btn-audio-play:hover {
  opacity: 0.9;
}
.btn-audio-play:active {
  opacity: 0.7;
}

/* ── Exercise Progress Bar ── */
.exercise-progress-bar {
  margin-bottom: 16px;
}
.exercise-progress-text {
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
  margin-bottom: 4px;
  font-weight: 600;
}

/* ── Exercise Feedback Overlay ── */
.exercise-feedback-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  animation: fadeIn 0.2s ease;
}
.exercise-feedback-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  max-width: 320px;
  width: 90%;
  box-shadow: 0 16px 48px rgba(0,0,0,0.15);
}
.exercise-feedback-card.correct {
  border-top: 4px solid var(--ok);
}
.exercise-feedback-card.wrong {
  border-top: 4px solid var(--danger);
}
.exercise-feedback-icon {
  font-size: 3rem;
  margin-bottom: 8px;
}
.exercise-feedback-card.correct .exercise-feedback-icon {
  color: var(--ok);
}
.exercise-feedback-card.wrong .exercise-feedback-icon {
  color: var(--danger);
}
.exercise-feedback-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.exercise-feedback-answer {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 16px;
}
.exercise-feedback-btn {
  min-width: 120px;
}

/* ── Dark theme adjustments for lang module ── */
[data-theme="dark"] .lang-card {
  border-color: #2d3245;
}
[data-theme="dark"] .lang-card:hover {
  border-color: #6c5ce7;
}
[data-theme="dark"] .exercise-input,
[data-theme="dark"] .exercise-textarea {
  border-color: #2d3245;
  background: #22263a;
}
[data-theme="dark"] .exercise-feedback-card {
  background: var(--card);
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .blocks-grid {
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  }
  .char-display { font-size: 4rem; }
  .canvas-wrap { max-width: 100%; }
  .lang-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  }
  .exercise-card {
    padding: 16px;
  }
}

/* ── Referral Page ───────────────────────────────────────────────── */

.referral-container {
  max-width: 560px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.referral-hero {
  text-align: center;
  padding: 24px 20px;
}
.referral-hero h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

.referral-code-display {
  margin: 20px 0 16px;
}
.referral-code-label {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.referral-code-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--kumon-blue);
  letter-spacing: 2px;
  margin-top: 4px;
  font-family: monospace;
}

.referral-share-row {
  display: flex;
  gap: 8px;
  align-items: center;
}
.referral-share-input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.85rem;
  background: var(--bg);
  color: var(--text);
  min-width: 0;
}
.referral-share-row .btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  white-space: nowrap;
}
.referral-share-row .btn-primary {
  background: var(--kumon-blue);
  color: #fff;
}
.referral-share-row .btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid #ddd;
}

.referral-generate {
  margin-top: 16px;
}
.referral-generate-row {
  display: flex;
  gap: 8px;
}
.referral-custom-input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: var(--bg);
  color: var(--text);
}
.referral-custom-input::placeholder {
  text-transform: none;
  letter-spacing: 0;
}
.referral-generate-row .btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  background: var(--kumon-blue);
  color: #fff;
}

.referral-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.referral-stat-card {
  text-align: center;
  padding: 20px 12px;
}
.referral-stat-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--kumon-blue);
}
.referral-stat-label {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 4px;
}

.referral-info-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  flex-wrap: wrap;
}
.referral-code-badge {
  background: var(--kumon-blue);
  color: #fff;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: monospace;
  letter-spacing: 1px;
}
.referral-apply-row {
  display: flex;
  gap: 8px;
  flex: 1;
  min-width: 200px;
}
.referral-apply-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.85rem;
  text-transform: uppercase;
  background: var(--bg);
  color: var(--text);
}
.referral-apply-row .btn {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
}
.referral-apply-row .btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid #ddd;
}

.referral-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.referral-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.referral-list-item:last-child {
  border-bottom: none;
}
.referral-list-name {
  font-weight: 600;
  flex: 1;
}
.referral-list-detail {
  font-size: 0.8rem;
}
.referral-list-date {
  font-size: 0.75rem;
  white-space: nowrap;
}

/* CTA on lang-selector */
.referral-cta {
  padding: 0 16px;
  margin-top: 12px;
}
.referral-cta-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: linear-gradient(120deg, #6c5ce7, #4834d4);
  color: #fff;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: opacity 0.2s;
}
.referral-cta-link:hover {
  opacity: 0.9;
}
.referral-cta-link span {
  flex: 1;
}

/* Dark theme overrides */
[data-theme="dark"] .referral-share-input,
[data-theme="dark"] .referral-custom-input,
[data-theme="dark"] .referral-apply-input {
  background: #22263a;
  border-color: #2d3245;
}
[data-theme="dark"] .referral-share-row .btn-secondary,
[data-theme="dark"] .referral-apply-row .btn-secondary {
  background: #22263a;
  border-color: #2d3245;
}
[data-theme="dark"] .referral-list-item {
  border-bottom-color: rgba(255,255,255,0.06);
}

/* ── Legal Pages (Terms, Privacy) ────────────────────────────────── */

.legal-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 20px 40px;
  line-height: 1.7;
  color: var(--text);
}
.legal-container h3 {
  margin: 28px 0 8px;
  font-size: 1.05rem;
  color: var(--kumon-blue);
}
.legal-container p {
  margin: 0 0 12px;
  font-size: 0.9rem;
  color: var(--text);
}
.legal-updated {
  font-size: 0.8rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 20px;
}

/* ── Site Footer ─────────────────────────────────────────────────── */

.site-footer {
  text-align: center;
  padding: 32px 16px 24px;
  margin-top: 24px;
  border-top: 1px solid rgba(0,0,0,0.06);
}
.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.8rem;
  transition: color 0.2s;
}
.footer-links a:hover {
  color: var(--kumon-blue);
}
.footer-sep {
  color: var(--muted);
  opacity: 0.4;
  font-size: 0.8rem;
}
.footer-copy {
  font-size: 0.7rem;
  color: var(--muted);
  opacity: 0.6;
  margin: 0;
}

[data-theme="dark"] .site-footer {
  border-top-color: rgba(255,255,255,0.06);
}