/* css/styles.css */
:root {
  --color-bg: #fef9f0;
  --color-primary: #ff8a5b;
  --color-primary-dark: #e56e3c;
  --color-secondary: #4ecdc4;
  --color-secondary-dark: #33a89f;
  --color-text: #3a2e2e;
  --color-muted: #8a7b6c;
  --color-card: #ffffff;
  --color-success: #4caf50;
  --color-error: #e74c3c;
  --color-locked: #d8d0c5;
  --radius: 16px;
  --shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  font-size: 17px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: linear-gradient(180deg, #fff5e6 0%, var(--color-bg) 100%);
  color: var(--color-text);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

/* ---------- 頁首 ---------- */
.site-header {
  background: var(--color-primary);
  color: #fff;
  padding: 20px 16px;
  box-shadow: var(--shadow);
}

.site-header .header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.site-header h1 {
  margin: 0;
  font-size: 1.4rem;
}

.site-header .subtitle {
  font-size: 0.85rem;
  opacity: 0.9;
}

.header-nav a {
  color: #fff;
  background: rgba(255, 255, 255, 0.18);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  transition: background 0.2s;
}

.header-nav a:hover {
  background: rgba(255, 255, 255, 0.32);
}

/* ---------- 卡片通用 ---------- */
.card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

/* ---------- 教材版本切換 ---------- */
.version-switcher-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.version-switcher-label {
  font-weight: 700;
}

.version-switcher-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.version-btn {
  border: 2px solid var(--color-primary);
  background: transparent;
  color: var(--color-primary-dark);
  padding: 8px 16px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s;
}

.version-btn.active {
  background: var(--color-primary);
  color: #fff;
}

.version-btn:hover:not(.active) {
  background: rgba(255, 138, 91, 0.12);
}

/* ---------- 首頁：今日任務 ---------- */
.today-task {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.today-task .task-icon {
  font-size: 2.4rem;
}

.today-task .task-info h2 {
  margin: 0 0 4px 0;
  font-size: 1.1rem;
}

.today-task .task-info p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.btn {
  display: inline-block;
  border: none;
  cursor: pointer;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 700;
  background: var(--color-primary);
  color: #fff;
  transition: transform 0.1s, background 0.2s;
}

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

.btn:active {
  transform: scale(0.97);
}

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

.btn.secondary:hover {
  background: var(--color-secondary-dark);
}

.btn.outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary-dark);
}

.btn:disabled {
  background: var(--color-locked);
  color: #fff;
  cursor: not-allowed;
}

/* ---------- 進度區 ---------- */
.progress-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.stat-box {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
  text-align: center;
}

.stat-box .stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}

.stat-box .stat-label {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.progress-bar-track {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: #eee0cf;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-primary));
  border-radius: 999px;
  transition: width 0.4s ease;
}

/* ---------- 單元卡片 ---------- */
.section-title {
  margin: 28px 0 12px;
  font-size: 1.15rem;
  font-weight: 800;
}

.unit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.stage-unit {
  grid-column: 1 / -1;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  background: #fff;
  overflow: hidden;
}

.stage-unit > summary {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  list-style: none;
}

.stage-unit > summary span {
  display: flex;
  gap: 0.7rem;
  align-items: center;
}

.stage-list {
  border-top: 1px solid #e5e7eb;
}

.stage-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid #e5e7eb;
}

.stage-row.locked {
  opacity: 0.62;
}

.stage-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .stage-unit > summary,
  .stage-unit > summary span,
  .stage-row {
    align-items: stretch;
    flex-direction: column;
  }

  .stage-actions .btn {
    flex: 1;
  }
}

.unit-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  transition: transform 0.15s;
}

.unit-card.available:hover {
  transform: translateY(-3px);
}

.unit-card .unit-icon {
  font-size: 1.8rem;
}

.unit-card h3 {
  margin: 0;
  font-size: 1rem;
}

.unit-card .unit-meta {
  font-size: 0.78rem;
  color: var(--color-muted);
}

.unit-card p.unit-desc {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin: 0;
  flex-grow: 1;
}

.badge {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 999px;
  font-weight: 700;
}

.badge.locked {
  background: var(--color-locked);
  color: #fff;
}

.badge.pending {
  background: #fff3cd;
  color: #8a5a00;
}

.badge.done {
  background: var(--color-success);
  color: #fff;
}

.badge.new {
  background: var(--color-secondary);
  color: #fff;
}

.unit-card.lesson-only {
  border-style: dashed;
}

.unit-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.unit-actions .btn {
  padding: 8px 14px;
  font-size: 0.86rem;
}

.wrong-review-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.wrong-review-entry .unit-meta {
  margin: 0;
}

.wrong-review-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.wrong-review-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 2px solid #eee0cf;
  border-radius: 12px;
  background: #fffdf9;
}

.wrong-review-item .btn {
  flex: 0 0 auto;
}

/* ---------- 每日任務與獎勵 ---------- */
.reward-layout {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(260px, 1.3fr);
  gap: 14px;
}

.reward-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.reward-meta {
  color: var(--color-muted);
  margin-bottom: 10px;
}

.badge-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.mini-badge {
  background: #fff2cc;
  color: #8a5a00;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 0.82rem;
  font-weight: 700;
}

.mission-list {
  display: grid;
  gap: 10px;
}

.mission-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  border: 2px solid #eee0cf;
  border-radius: 12px;
  background: #fffdf9;
}

.mission-item.done {
  border-color: var(--color-success);
  background: #eafaea;
}

.level-reward-list {
  display: grid;
  gap: 10px;
  margin: 10px 0;
}

.level-reward-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  border: 2px solid #eee0cf;
  border-radius: 12px;
  background: #fffdf9;
}

.level-reward-item.locked {
  opacity: 0.6;
}

.level-reward-item.unlocked {
  border-color: #f5a623;
  background: #fff6e5;
}

.level-reward-item.confirmed {
  border-color: var(--color-success);
  background: #eafaea;
}

.btn.small {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.level-reward-trigger {
  margin-top: 12px;
}

/* ---------- 等級獎品彈出視窗 ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(30, 20, 10, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 1000;
}

.modal-overlay[hidden] {
  display: none;
}

.modal-panel {
  background: #fff;
  border-radius: 18px;
  padding: 20px;
  width: 100%;
  max-width: 460px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.btn.icon {
  background: transparent;
  color: var(--color-muted);
  padding: 4px 10px;
  font-size: 1.1rem;
  border-radius: 999px;
}

.btn.icon:hover {
  background: #f5f0e8;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 14px;
}

@media (max-width: 600px) {
  .wrong-review-entry,
  .wrong-review-item {
    align-items: stretch;
    flex-direction: column;
  }

  .modal-overlay {
    align-items: flex-end;
    padding: 0;
  }

  .modal-panel {
    max-width: 100%;
    width: 100%;
    max-height: 90vh;
    border-radius: 18px 18px 0 0;
  }
}

/* ---------- 帳號與雲端同步：已登入精簡卡片 ---------- */
.sync-compact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border: 2px solid #d7ecd7;
  border-radius: 12px;
  background: #f2faf2;
}

.sync-compact[hidden] {
  display: none;
}

.sync-compact .sync-status {
  margin: 0;
}

.sync-compact #sync-compact-detail {
  margin: 0 0 6px;
}

.sync-compact button {
  align-self: flex-start;
}

#account-form-wrap[hidden] {
  display: none;
}

/* ---------- 練習頁 ---------- */
.practice-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.question-card {
  margin-top: 10px;
}

.question-prompt {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 18px;
  line-height: 1.6;
}

.choice-list {
  display: grid;
  gap: 10px;
}

.choice-btn {
  text-align: left;
  padding: 14px 16px;
  border-radius: 12px;
  border: 2px solid #eee0cf;
  background: #fffdf9;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.15s;
}

.choice-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
}

.choice-btn.correct {
  border-color: var(--color-success);
  background: #eafaea;
  color: #256d29;
  font-weight: 700;
}

.choice-btn.incorrect {
  border-color: var(--color-error);
  background: #fdecea;
  color: #a8342a;
  font-weight: 700;
}

.choice-btn:disabled {
  cursor: default;
}

.input-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.input-row input[type="text"] {
  flex: 1;
  min-width: 180px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 2px solid #eee0cf;
  font-size: 1.05rem;
}

.input-row input[type="text"].correct {
  border-color: var(--color-success);
}

.input-row input[type="text"].incorrect {
  border-color: var(--color-error);
}

.feedback-box {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 12px;
  font-size: 0.95rem;
  display: none;
}

.feedback-box.show {
  display: block;
}

.feedback-box.correct {
  background: #eafaea;
  color: #256d29;
}

.feedback-box.incorrect {
  background: #fdecea;
  color: #a8342a;
}

.feedback-box .explanation {
  margin-top: 8px;
  color: var(--color-text);
}

.reward-feedback {
  font-weight: 700;
}

/* ---------- 教學頁 ---------- */
.lesson-hero {
  display: grid;
  gap: 10px;
}

.lesson-section {
  margin-top: 16px;
}

.lesson-section h3 {
  margin-bottom: 8px;
}

.lesson-list {
  padding-left: 1.3rem;
  line-height: 1.8;
}

.example-card {
  border: 2px solid #eee0cf;
  border-radius: 12px;
  padding: 12px;
  margin: 10px 0;
  background: #fffdf9;
}

.lesson-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.lesson-message {
  margin-top: 12px;
  color: var(--color-success);
  font-weight: 800;
}

.lesson-checklist {
  list-style: none;
  padding: 0;
  line-height: 2;
}

.lesson-checklist input[type="checkbox"] {
  width: 18px;
  height: 18px;
  vertical-align: middle;
  margin-right: 6px;
}

.lesson-check-hint {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.lesson-completed-badge {
  color: var(--color-success);
  font-weight: 700;
}

.hint-btn {
  background: none;
  border: none;
  color: var(--color-secondary-dark);
  font-weight: 700;
  cursor: pointer;
  padding: 0;
  margin-top: 12px;
  font-size: 0.9rem;
}

.hint-text {
  display: none;
  margin-top: 6px;
  font-size: 0.88rem;
  color: var(--color-muted);
}

.hint-text.show {
  display: block;
}

.practice-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 20px;
  flex-wrap: wrap;
  gap: 10px;
}

.summary-screen {
  text-align: center;
  padding: 30px 16px;
}

.summary-screen .big-emoji {
  font-size: 3.2rem;
}

.summary-stats {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin: 18px 0;
  flex-wrap: wrap;
}

/* ---------- 家長頁 ---------- */
.parent-lock {
  max-width: 560px;
  margin: 40px auto 0;
  text-align: center;
}

.parent-lock .lock-icon {
  font-size: 3rem;
}

.parent-lock h2 {
  margin: 8px 0;
}

.parent-lock p {
  color: var(--color-muted);
}

.parent-login-form {
  margin-top: 20px;
  text-align: left;
}

.parent-login-form label {
  display: block;
  margin-bottom: 6px;
  font-weight: 700;
}

.parent-login-form input[type="password"] {
  flex: 1;
  min-width: 180px;
  padding: 12px 14px;
  border: 2px solid #eee0cf;
  border-radius: 12px;
  font-size: 1.05rem;
}

.parent-login-form input[type="password"]:focus {
  border-color: var(--color-primary);
  outline: 3px solid rgba(255, 138, 91, 0.2);
}

#auth-form input[type="email"],
#auth-form input[type="password"] {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid #eee0cf;
  border-radius: 12px;
  font-size: 1.05rem;
  margin-bottom: 12px;
  box-sizing: border-box;
}

#auth-form input:focus {
  border-color: var(--color-primary);
  outline: 3px solid rgba(255, 138, 91, 0.2);
}

#auth-form input:disabled {
  background: #f5f0e8;
  color: var(--color-muted);
}

.sync-status {
  font-weight: 700;
  color: var(--color-primary);
  margin: 4px 0 14px;
}

#parent-sync-banner {
  margin-bottom: 16px;
}

.password-error {
  min-height: 1.4em;
  margin: 8px 0 0;
  color: var(--color-error) !important;
  font-weight: 700;
}

table.parent-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 0.9rem;
}

table.parent-table th,
table.parent-table td {
  padding: 10px 8px;
  border-bottom: 1px solid #eee0cf;
  text-align: left;
}

table.parent-table th {
  color: var(--color-muted);
  font-weight: 700;
  font-size: 0.82rem;
}

.wrong-item {
  border-bottom: 1px solid #eee0cf;
  padding: 12px 0;
}

.wrong-item:last-child {
  border-bottom: none;
}

.wrong-item .wrong-prompt {
  font-weight: 700;
}

.wrong-item .wrong-answers {
  font-size: 0.88rem;
  color: var(--color-muted);
  margin: 4px 0;
}

.wrong-item .wrong-explanation {
  font-size: 0.88rem;
}

.empty-hint {
  color: var(--color-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 20px 0;
}

footer.site-footer {
  text-align: center;
  color: var(--color-muted);
  font-size: 0.8rem;
  padding: 30px 16px 40px;
}

.danger-zone {
  margin-top: 24px;
  text-align: right;
}

.btn.danger {
  background: var(--color-error);
}

.btn.danger:hover {
  background: #c0392b;
}

@media (max-width: 480px) {
  :root {
    font-size: 16px;
  }

  @media (max-width: 760px) {
    .reward-layout {
      grid-template-columns: 1fr;
    }
  }
  .summary-stats {
    gap: 14px;
  }
}