* { box-sizing: border-box; }

:root {
  --bg: #fffaf0;
  --card: #fffdf8;
  --text: #4a3728;
  --subtext: #7b6857;
  --border: #eadfca;
  --primary: #9c5d09;
  --primary-soft: #fff1cd;
  --success: #6e8f28;
  --success-soft: #eef6d7;
  --danger: #d45a3a;
  --danger-soft: #ffe6de;
  --warning: #cc8a1f;
  --warning-soft: #fff1d6;
  --pudding: #f6e97a;
  --pudding-deep: #efcf4f;
  --brown: #8a4f08;
  --cream: #fff7d9;
  --shadow: 0 10px 30px rgba(123, 104, 87, 0.12);
  --radius: 18px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans TC", "PingFang TC", sans-serif;
  background:
    radial-gradient(circle at top left, #fff7cf 0%, transparent 28%),
    linear-gradient(180deg, #fffdf6 0%, #fff6d9 100%);
  color: var(--text);
  min-height: 100vh;
}

.app-shell {
  max-width: 1380px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 20px;
  align-items: start;
}

.page-shell {
  min-width: 0;
  display: grid;
  gap: 20px;
}

.hero,
.panel,
.practice-card,
.stats-card,
.detail-card,
.wrong-card,
.example-card,
.nav-shell,
.sidebar-nav {
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
}

.sidebar-nav {
  padding: 18px;
  position: sticky;
  top: 24px;
  background: linear-gradient(180deg, #fffdf8 0%, #fff8e3 100%);
}

.sidebar-brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 16px;
}

.brand-badge {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-size: 22px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--pudding) 0%, var(--pudding-deep) 100%);
  color: var(--brown);
  border: 1px solid #e0c24a;
}

.brand-title {
  font-size: 18px;
  font-weight: 900;
  color: var(--brown);
}

.brand-subtitle {
  font-size: 13px;
  color: var(--subtext);
}

.sidebar-links {
  display: grid;
  gap: 10px;
}

.sidebar-link {
  text-decoration: none;
  border: 1px solid #ebd89a;
  background: #fff4c9;
  color: var(--brown);
  padding: 14px 16px;
  border-radius: 14px;
  font-weight: 800;
  transition: transform 0.15s ease, background 0.15s ease;
}

.sidebar-link:hover {
  transform: translateY(-1px);
  background: #ffefb5;
}

.sidebar-link.active {
  background: linear-gradient(135deg, var(--pudding) 0%, var(--pudding-deep) 100%);
  border-color: #e0c24a;
}

.hero {
  padding: 28px;
  background: linear-gradient(135deg, #fffdf2 0%, #fff6c7 100%);
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 32px;
  color: var(--brown);
}

.hero p {
  margin: 0;
  color: var(--subtext);
  line-height: 1.7;
}

.layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 20px;
  align-items: start;
}

.panel {
  padding: 20px;
  position: sticky;
  top: 24px;
  background: linear-gradient(180deg, #fffdf8 0%, #fff8e3 100%);
}

.panel h2,
.practice-card h2,
.stats-card h2,
.detail-card h2,
.wrong-card h2,
.example-card h2 {
  margin: 0 0 16px;
  font-size: 20px;
  color: var(--brown);
}

.section + .section {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px dashed var(--border);
}

.label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 8px;
}

select, input, button {
  font: inherit;
}

select,
input[type="text"],
input[type="password"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  background: #fffefb;
  color: var(--text);
}

.checkbox-group {
  display: grid;
  gap: 10px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
}

.checkbox-item input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--brown);
}

.mode-box {
  display: grid;
  gap: 10px;
}

.mode-option {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  display: flex;
  gap: 10px;
  align-items: start;
  cursor: pointer;
  background: #fffef8;
}

.mode-option:hover {
  border-color: #cfc49f;
  background: #fff9e5;
}

.mode-option input {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--brown);
}

.mode-title {
  font-weight: 800;
  margin-bottom: 4px;
}

.mode-desc,
.small-note,
.verb-sub,
.answer-info,
.example-reading,
.example-zh,
.detail-meta,
.verb-item-meta,
.wrong-empty,
.empty-state,
.card-caption,
.example-note,
.vocab-example-wrap {
  color: var(--subtext);
  line-height: 1.7;
}

.mode-desc,
.small-note,
.verb-item-meta,
.detail-meta,
.card-caption,
.example-note,
.vocab-example-wrap {
  font-size: 14px;
}

.button-row {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

button,
.primary-link {
  border: none;
  border-radius: 14px;
  padding: 12px 16px;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
  font-weight: 800;
  text-decoration: none;
}

button:hover,
.primary-link:hover {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--pudding) 0%, var(--pudding-deep) 100%);
  color: var(--brown);
  border: 1px solid #e0c24a;
}

.btn-secondary {
  background: #f8ead0;
  color: var(--brown);
  border: 1px solid #ebd0a0;
}

.btn-light {
  background: #fff7dc;
  color: var(--brown);
  border: 1px solid #f1ddb0;
}

.btn-warning {
  background: #fff1d6;
  color: #a06813;
  border: 1px solid #ebd0a0;
}

.btn-danger-outline {
  width: 100%;
  background: #fffdf8;
  color: var(--danger);
  border: 1px solid #f0c5b8;
}

.btn-danger-outline:hover {
  background: var(--danger-soft);
}

.main {
  display: grid;
  gap: 20px;
}

.practice-card,
.stats-card,
.detail-card,
.wrong-card,
.example-card {
  padding: 24px;
}

.question-top,
.title-row,
.question-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.question-top,
.title-row {
  justify-content: space-between;
  margin-bottom: 14px;
}

.question-heading h2,
.title-row h2 {
  margin: 0;
}

.mode-chip,
.badge {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
}

.mode-chip,
.badge {
  background: #fff0c6;
  color: var(--brown);
  border: 1px solid #efd894;
}

.badge.success-badge {
  background: var(--success-soft);
  color: var(--success);
  border-color: #d9eab9;
}

.badge.error-badge {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: #f0c5b8;
}

.badge.warning-badge {
  background: var(--warning-soft);
  color: var(--warning);
  border-color: #efd9a8;
}

.verb-box {
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  background: linear-gradient(180deg, #fffdf8 0%, #fff6d8 100%);
  margin-bottom: 18px;
}

.verb-main {
  font-size: 50px;
  font-weight: 900;
  color: var(--brown);
  margin-bottom: 8px;
  line-height: 1.25;
  word-break: break-word;
}

.verb-sub {
  margin-top: 12px;
  font-size: 28px;
  font-weight: 700;
  color: var(--brown);
  line-height: 1.5;
}

.vocab-front-sub {
  font-size: 22px;
}

.verb-sub .sub-label {
  font-size: 18px;
  font-weight: 700;
  color: var(--subtext);
  margin-right: 8px;
}

.target-banner {
  margin-top: 16px;
  display: inline-block;
  background: linear-gradient(135deg, var(--pudding) 0%, var(--pudding-deep) 100%);
  color: var(--brown);
  font-size: 26px;
  font-weight: 900;
  padding: 14px 18px;
  border-radius: 18px;
  border: 2px solid #f0d14b;
  box-shadow: inset 0 -3px 0 rgba(138, 79, 8, 0.08);
}

.completion-actions {
  margin-top: 22px;
}

.answer-area {
  display: grid;
  gap: 12px;
  margin-bottom: 16px;
}

.answer-tools {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.vocab-actions {
  margin-bottom: 16px;
}

.vocab-round-plan {
  margin: 0 0 16px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid #efd894;
  background: #fff9e5;
  color: var(--brown);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.6;
}

.result-area {
  min-height: 120px;
  display: grid;
  align-content: start;
  gap: 10px;
}

.feedback {
  min-height: 52px;
  border-radius: 16px;
  padding: 14px 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
}

.feedback.hidden {
  display: none;
}

.feedback.success {
  background: var(--success-soft);
  color: var(--success);
}

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

.feedback.warning {
  background: var(--warning-soft);
  color: var(--warning);
}

.stats-grid,
.detail-grid {
  display: grid;
  gap: 12px;
}

.stats-grid {
  grid-template-columns: repeat(4, 1fr);
}

.detail-grid {
  grid-template-columns: repeat(2, 1fr);
}

.stat-item,
.detail-row,
.example-box,
.verb-item {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #fffef9;
}

.stat-item,
.detail-row {
  padding: 16px;
}

.stat-label {
  font-size: 13px;
  color: var(--subtext);
  margin-bottom: 6px;
}

.stat-value {
  font-size: 28px;
  font-weight: 900;
  color: var(--brown);
}

.detail-title,
.verb-item-title {
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--brown);
}

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

.verb-item {
  padding: 14px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.verb-item-left {
  display: grid;
  gap: 4px;
}

.example-box {
  padding: 18px;
  display: grid;
  gap: 10px;
  background: linear-gradient(180deg, #fffdf8 0%, #fff9e9 100%);
}

.example-jp {
  font-size: 20px;
  font-weight: 800;
  line-height: 1.8;
  color: var(--brown);
}

.example-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

.vocab-back-card {
  margin-bottom: 16px;
}

.hidden-block {
  display: none;
}

.inline-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

@media (max-width: 1120px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar-nav {
    position: static;
  }

  .sidebar-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .panel {
    position: static;
  }

  .stats-grid,
  .detail-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 760px) {
  .sidebar-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .app-shell {
    padding: 16px;
  }

  .hero h1 {
    font-size: 26px;
  }

  .verb-main {
    font-size: 38px;
  }

  .verb-sub {
    font-size: 22px;
  }

  .vocab-front-sub {
    font-size: 18px;
  }

  .verb-sub .sub-label {
    font-size: 16px;
  }

  .target-banner {
    font-size: 22px;
  }

  .stats-grid,
  .detail-grid,
  .sidebar-links {
    grid-template-columns: 1fr;
  }

  .answer-tools,
  .inline-actions {
    flex-direction: column;
  }
}


.vocab-startable {
  cursor: pointer;
}

.vocab-startable:hover {
  border-color: #e0c24a;
  box-shadow: 0 0 0 3px rgba(239, 207, 79, 0.15);
}

.vocab-inline-start {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.vocab-inline-start button {
  min-width: 140px;
}

.answer-tools.vocab-actions {
  align-items: center;
}

@media (max-width: 560px) {
  .vocab-inline-start {
    flex-direction: column;
  }

  .vocab-inline-start button {
    width: 100%;
  }
}


/* Home + Grammar */

.hero-home {
  display: grid;
  gap: 12px;
}

.hero-kicker {
  display: inline-flex;
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid #efd894;
  background: #fff0c6;
  color: var(--brown);
  font-size: 13px;
  font-weight: 800;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature-card,
.quick-link-pill {
  text-decoration: none;
}

.feature-card {
  background: linear-gradient(180deg, #fffdf8 0%, #fff7dc 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
  padding: 24px;
  display: grid;
  gap: 12px;
  color: var(--text);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  border-color: #e0c24a;
  box-shadow: 0 16px 36px rgba(123, 104, 87, 0.14);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 24px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--pudding) 0%, var(--pudding-deep) 100%);
  color: var(--brown);
  border: 1px solid #e0c24a;
}

.feature-title {
  font-size: 24px;
  font-weight: 900;
  color: var(--brown);
}

.feature-desc,
.feature-meta,
.grammar-summary,
.grammar-breadcrumb,
.info-chip,
.topic-pill-summary,
.grammar-lead,
.grammar-content p,
.grammar-content li {
  color: var(--subtext);
  line-height: 1.9;
}

.feature-meta {
  font-size: 14px;
}

.utility-card {
  padding: 24px;
}

.quick-links-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.quick-link-pill {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  border-radius: 999px;
  background: #fff4c9;
  border: 1px solid #ebd89a;
  color: var(--brown);
  font-weight: 800;
}

.grammar-layout {
  grid-template-columns: 280px 1fr;
}

.level-button-grid,
.topic-pill-grid {
  display: grid;
  gap: 10px;
}

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

.level-button,
.topic-pill {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #fffef8;
  color: var(--brown);
  padding: 14px 16px;
  text-align: left;
  font-weight: 800;
}

.level-button.active,
.topic-pill.active {
  background: linear-gradient(135deg, var(--pudding) 0%, var(--pudding-deep) 100%);
  border-color: #e0c24a;
}

.info-chip {
  display: inline-flex;
  padding: 10px 14px;
  border-radius: 999px;
  background: #fff7dc;
  border: 1px solid #f1ddb0;
  color: var(--brown);
  font-weight: 800;
}

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

.topic-pill {
  display: grid;
  gap: 4px;
}

.topic-pill-title {
  color: var(--brown);
  font-size: 16px;
}

.topic-pill-summary {
  font-size: 13px;
}

.grammar-article-card {
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
  padding: 28px;
}

.grammar-article-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  flex-wrap: wrap;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 20px;
}

.grammar-breadcrumb {
  font-size: 13px;
  margin-bottom: 8px;
}

#grammarArticleTitle {
  margin: 0 0 8px;
  font-size: 34px;
  color: var(--brown);
}

.grammar-summary {
  margin: 0;
}

.grammar-tag-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.grammar-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: #fff0c6;
  border: 1px solid #efd894;
  color: var(--brown);
  font-size: 13px;
  font-weight: 800;
}

.grammar-content {
  display: grid;
  gap: 18px;
}

.grammar-content h2,
.grammar-content h3 {
  margin: 0;
  color: var(--brown);
}

.grammar-lead {
  font-size: 16px;
}

.grammar-note-card,
.grammar-structure-card,
.grammar-empty {
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 18px 20px;
  background: linear-gradient(180deg, #fffdf8 0%, #fff9e9 100%);
}

.grammar-note-title {
  font-size: 22px;
  font-weight: 900;
  color: var(--brown);
  margin-bottom: 10px;
}

.grammar-note-body p,
.grammar-structure-card p,
.grammar-empty {
  margin: 8px 0;
  line-height: 1.9;
  color: var(--text);
}

.grammar-example-list,
.grammar-point-list {
  margin: 10px 0 0;
  padding-left: 22px;
  display: grid;
  gap: 8px;
}

.tone-pink {
  background: linear-gradient(180deg, #fff9fb 0%, #fff1f6 100%);
}

.tone-orange {
  background: linear-gradient(180deg, #fffdf7 0%, #fff3e1 100%);
}

.tone-red {
  background: linear-gradient(180deg, #fffaf7 0%, #ffece4 100%);
}

@media (max-width: 1120px) {
  .feature-grid,
  .topic-pill-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sidebar-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .feature-grid,
  .topic-pill-grid,
  .level-button-grid,
  .grammar-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  #grammarArticleTitle {
    font-size: 28px;
  }
}

@media (max-width: 560px) {
  .feature-grid,
  .topic-pill-grid,
  .level-button-grid,
  .sidebar-links {
    grid-template-columns: 1fr;
  }

  .feature-title {
    font-size: 22px;
  }

  .quick-links-row {
    display: grid;
  }
}

/* ===== 語音播放按鈕 ===== */
.tts-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  font-size: 16px;
  line-height: 1;
  vertical-align: middle;
  background: #fff7dc;
  border: 1px solid #f1ddb0;
  border-radius: 50%;
  cursor: pointer;
}

.tts-btn:hover {
  background: #ffefc2;
}

/* ===== 背單字專注模式：背卡時隱藏統計區塊 ===== */
body[data-page='vocab'].vocab-focus .hero,
body[data-page='vocab'].vocab-focus .stats-card,
body[data-page='vocab'].vocab-focus .detail-card {
  display: none;
}

/* ===== 單字管理頁 ===== */
.editor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 16px;
  margin-bottom: 8px;
}

.editor-grid .span-2 {
  grid-column: 1 / -1;
}

@media (max-width: 640px) {
  .editor-grid {
    grid-template-columns: 1fr;
  }
}

/* 相關詞：一列一組（分類＋詞＋移除鈕） */
.related-row {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  gap: 8px;
  margin-bottom: 8px;
}

.related-row .rel-remove {
  width: auto;
  padding: 8px 12px;
}

/* 網格內不套用側欄那套「section 之間加虛線間隔」的規則，改用 grid gap 對齊 */
.editor-grid .section + .section {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.row-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.row-actions button {
  width: auto;
  padding: 8px 14px;
}

/* ===== Firebase 登入／同步介面 ===== */
.jp-auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(74, 55, 40, 0.45);
  backdrop-filter: blur(4px);
  padding: 24px;
}

.jp-auth-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px 30px;
  max-width: 380px;
  width: 100%;
  display: grid;
  gap: 16px;
  text-align: center;
}

.jp-auth-title {
  font-size: 20px;
  font-weight: 900;
  color: var(--brown);
}

.jp-auth-note {
  font-size: 14px;
  color: var(--subtext);
  line-height: 1.6;
}

.jp-auth-google {
  font-size: 15px;
  padding: 12px 18px;
}

.jp-auth-skip {
  border: none;
  background: none;
  color: var(--subtext);
  font-size: 13px;
  text-decoration: underline;
  cursor: pointer;
  padding: 4px;
}

.jp-account-box {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  display: grid;
  gap: 8px;
}

.jp-account-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--brown);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.jp-account-role {
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 8px;
}

.jp-account-uid {
  border: none;
  background: none;
  color: var(--subtext);
  font-size: 11px;
  text-align: left;
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.jp-account-uid:hover {
  color: var(--primary);
  text-decoration: underline;
}

.jp-account-signout {
  font-size: 13px;
  padding: 8px 12px;
}

.jp-toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%) translateY(20px);
  z-index: 1100;
  background: var(--text);
  color: #fffdf6;
  font-size: 14px;
  line-height: 1.5;
  padding: 12px 18px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  max-width: min(90vw, 480px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.jp-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}