/* ════════════════════════════════════════════════════════════
   多多益善 — 全站樣式
   對應 app.js 裡所有元件的 class 名稱
   ════════════════════════════════════════════════════════════ */

/* ── CSS 變數（設計 token）────────────────────────────────── */
:root {
  --blue-50:    #E6F1FB;
  --blue-100:   #B5D4F4;
  --blue-200:   #85B7EB;
  --blue-400:   #378ADD;
  --blue-600:   #185FA5;
  --blue-800:   #0C447C;

  --teal-50:    #E1F5EE;
  --teal-100:   #9FE1CB;
  --teal-400:   #1D9E75;
  --teal-600:   #0F6E56;

  --amber-50:   #FAEEDA;
  --amber-100:  #FAC775;
  --amber-400:  #BA7517;
  --amber-600:  #854F0B;

  --red-50:     #FCEBEB;
  --red-100:    #F7C1C1;
  --red-400:    #E24B4A;
  --red-600:    #A32D2D;

  --green-50:   #EAF3DE;
  --green-400:  #639922;
  --green-600:  #3B6D11;

  --purple-50:  #EEEDFE;
  --purple-100: #CECBF6;
  --purple-400: #7F77DD;
  --purple-600: #534AB7;

  --gray-50:    #F1EFE8;
  --gray-100:   #D3D1C7;
  --gray-200:   #B4B2A9;
  --gray-400:   #888780;
  --gray-600:   #5F5E5A;
  --gray-800:   #444441;

  /* 語意色 */
  --bg:           #F7F6F3;
  --surface:      #FFFFFF;
  --text-primary: #1A1916;
  --text-muted:   #6B6A65;
  --border:       rgba(60, 56, 45, 0.12);
  --border-strong:rgba(60, 56, 45, 0.22);

  /* 陰影 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);

  /* 圓角 */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;

  /* 字型 */
  --font-sans:    'Noto Sans TC', sans-serif;
  --font-display: 'DM Serif Display', serif;
  --font-mono:    'JetBrains Mono', monospace;
}

/* ── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: var(--font-sans);
  cursor: pointer;
}

/* ════════════════════════════════════════════════════════════
   NAVBAR
   ════════════════════════════════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 60px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 0.5px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.15s;
  border: none;
  background: none;
}
.navbar-logo:hover { opacity: 0.7; }

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--blue-600);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  font-weight: 700;
  color: white;
  letter-spacing: -1px;
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.navbar-username {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.navbar-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-400), var(--purple-400));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: white;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  border: none;
  padding: 0;
}
.navbar-avatar:hover {
  transform: scale(1.1);
  box-shadow: 0 0 0 4px var(--blue-50), 0 0 0 5px var(--blue-100);
}

/* ════════════════════════════════════════════════════════════
   VIEW 通用
   ════════════════════════════════════════════════════════════ */
.view {
  padding-top: 60px;
  min-height: 100vh;
  animation: fadeInUp 0.22s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ════════════════════════════════════════════════════════════
   HOME VIEW
   ════════════════════════════════════════════════════════════ */
.home-view {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  min-height: 100vh;
}

.home-bg-watermark {
  position: absolute;
  right: -60px;
  bottom: -80px;
  font-size: 360px;
  opacity: 0.032;
  color: var(--blue-600);
  font-family: var(--font-display);
  line-height: 1;
  transform: rotate(-12deg);
  pointer-events: none;
  user-select: none;
}

.home-card {
  background: var(--surface);
  border-radius: var(--r-xl);
  border: 0.5px solid var(--border);
  box-shadow: var(--shadow-md);
  padding: 56px 48px 44px;
  max-width: 560px;
  width: calc(100% - 48px);
  position: relative;
  z-index: 1;
  text-align: center;
}

.home-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--blue-50);
  color: var(--blue-600);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 99px;
  margin-bottom: 20px;
}

.home-title {
  font-family: var(--font-display);
  font-size: 36px;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.home-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
}

.home-btns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 5px;
}

.home-tags {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.home-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--gray-50);
  color: var(--gray-600);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 99px;
  border: 0.5px solid var(--border);
}

.error-msg {
  color: var(--red-400);
  font-size: 13px;
  margin-top: 12px;
  text-align: center;
}

/* ════════════════════════════════════════════════════════════
   BUTTONS（通用）
   ════════════════════════════════════════════════════════════ */
.btn-primary {
  background: var(--blue-600);
  color: white;
  border: none;
  border-radius: var(--r-md);
  padding: 13px 20px;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  transition: background 0.15s, transform 0.1s, opacity 0.15s;
}
.btn-primary:hover:not(:disabled) { background: var(--blue-800); }
.btn-primary:active:not(:disabled) { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background: white;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  padding: 13px 20px;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  transition: background 0.15s, transform 0.1s;
}
.btn-secondary:hover { background: var(--gray-50); }
.btn-secondary:active { transform: scale(0.98); }

.btn-outline {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  transition: background 0.15s, transform 0.1s;
}
.btn-outline:hover { background: var(--gray-50); }
.btn-outline:active { transform: scale(0.98); }

/* ════════════════════════════════════════════════════════════
   PROFILE VIEW
   ════════════════════════════════════════════════════════════ */
.profile-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 24px 60px;
}

.profile-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  padding: 6px 0;
  margin-bottom: 20px;
  border: none;
  background: none;
  transition: color 0.15s;
}
.profile-back-btn:hover { color: var(--text-primary); }

.profile-header-card {
  background: var(--surface);
  border-radius: var(--r-lg);
  border: 0.5px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 24px 28px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.profile-big-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-400), var(--purple-400));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}

.profile-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
}

.profile-meta {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* 大頭貼下拉選單樣式 */
.profile-dropdown {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  background-color: white;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  min-width: 180px;
  z-index: 1000;
  padding: 8px 0;
  display: flex;
  flex-direction: column;
  animation: slideDown 0.15s ease-out;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 統計數字三欄 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--r-lg);
  border: 0.5px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 20px 20px 16px;
  position: relative;
  overflow: hidden;
}

.stat-bg-icon {
  position: absolute;
  right: -4px;
  top: 4px;
  font-size: 64px;
  opacity: 0.07;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.3px;
  margin-bottom: 6px;
}

.stat-value {
  font-size: 30px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.stat-value small {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-muted);
  font-family: var(--font-sans);
}

.stat-change {
  font-size: 12px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 8px;
  border-radius: 99px;
}
.stat-change.up      { background: var(--teal-50);  color: var(--teal-600); }
.stat-change.neutral { background: var(--gray-50);  color: var(--gray-600); }
.stat-change.down    { background: var(--red-50);   color: var(--red-600);  }

/* 圖表兩欄 */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.chart-card {
  background: var(--surface);
  border-radius: var(--r-lg);
  border: 0.5px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 20px 20px 16px;
}

.chart-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 3px;
}

.chart-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.chart-wrap {
  position: relative;
  height: 200px;
}

.dropdown-item {
  padding: 10px 16px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-primary);
  transition: background-color 0.15s;
  display: flex;
  align-items: center;
}

.dropdown-item:hover {
  background-color: var(--gray-50);
}

.logout-item {
  color: #dc2626; /* 讓登出按鈕變成紅色的警示色 */
  font-weight: 500;
}

.logout-item:hover {
  background-color: #fef2f2;
}

/* ════════════════════════════════════════════════════════════
   QUIZ VIEW
   ════════════════════════════════════════════════════════════ */
.quiz-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 28px 24px 60px;
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 20px;
  align-items: start;
}

/* 左側主作答區 */
/* .quiz-main {} */

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.quiz-question-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.quiz-question-num {
  font-size: 28px;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-top: 2px;
}

.quiz-timer {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--red-50);
  border: 1px solid var(--red-100);
  border-radius: var(--r-md);
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--red-600);
  transition: background 0.3s;
}

/* 最後 2 分鐘閃爍警告 */
.quiz-timer.urgent {
  animation: timerPulse 1s ease-in-out infinite;
}

@keyframes timerPulse {
  0%, 100% { background: var(--red-50); }
  50%       { background: var(--red-100); }
}

.quiz-card {
  background: var(--surface);
  border-radius: var(--r-lg);
  border: 0.5px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 28px 28px 24px;
  margin-bottom: 16px;
}

.quiz-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--gray-50);
  color: var(--gray-600);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: 99px;
  border: 0.5px solid var(--border);
  margin-bottom: 16px;
}

.quiz-question-text {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 24px;
}

/* 選項列表 */
.option-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  padding: 14px 18px;
  cursor: pointer;
  font-size: 15px;
  text-align: left;
  width: 100%;
  color: var(--text-primary);
  transition: background 0.12s, border-color 0.12s, transform 0.08s;
}

.option-btn:hover:not(.selected) {
  background: var(--blue-50);
  border-color: var(--blue-100);
}

.option-btn:active { transform: scale(0.99); }

.option-btn.selected {
  background: var(--blue-50);
  border-color: var(--blue-400);
  color: var(--blue-800);
}

.option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
  background: white;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  font-family: var(--font-mono);
  transition: all 0.12s;
}

.option-btn.selected .option-letter {
  background: var(--blue-600);
  border-color: var(--blue-600);
  color: white;
}

/* 上一題 / 下一題 控制列 */
.quiz-controls {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.15s, transform 0.1s;
}
.btn-nav:hover:not(:disabled) { background: var(--gray-50); }
.btn-nav:active:not(:disabled) { transform: scale(0.98); }
.btn-nav:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-submit {
  margin-left: auto;
  background: var(--red-400);
  color: white;
  border: none;
  border-radius: var(--r-md);
  padding: 11px 22px;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 7px;
  transition: background 0.15s, transform 0.1s;
}
.btn-submit:hover { background: var(--red-600); }
.btn-submit:active { transform: scale(0.98); }

/* 右側導覽側欄 */
/* .quiz-sidebar {}*/

.sidebar-card {
  background: var(--surface);
  border-radius: var(--r-lg);
  border: 0.5px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 20px;
  position: sticky;
  top: 80px; /* navbar 高度 + 20px */
}

.sidebar-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.7px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.q-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.q-btn {
  aspect-ratio: 1;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border);
  background: white;
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-mono);
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.12s;
}
.q-btn:hover {
  border-color: var(--blue-400);
  color: var(--blue-600);
}
.q-btn.answered {
  background: var(--blue-50);
  border-color: var(--blue-400);
  color: var(--blue-600);
}
.q-btn.current {
  background: var(--blue-600);
  border-color: var(--blue-600);
  color: white;
}

.q-legend {
  display: flex;
  flex-direction: column;
  gap: 7px;
  border-top: 0.5px solid var(--border);
  padding-top: 14px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}
.current-dot  { background: var(--blue-600); }
.answered-dot { background: var(--blue-50); border: 1.5px solid var(--blue-400); }
.empty-dot    { background: white; border: 1.5px solid var(--border); }

/* ════════════════════════════════════════════════════════════
   RESULT VIEW
   ════════════════════════════════════════════════════════════ */
.result-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.result-header {
  text-align: center;
  background: var(--surface);
  border-radius: var(--r-xl);
  border: 0.5px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 44px 32px 36px;
  margin-bottom: 32px;
}

.result-title {
  font-family: var(--font-display);
  font-size: 32px;
  margin-bottom: 28px;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.score-circle-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 5px solid var(--teal-400);
  background: var(--teal-50);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: border-color 0.3s, background 0.3s;
}
.score-circle.fail {
  border-color: var(--red-400);
  background: var(--red-50);
}

.score-value {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  color: var(--teal-600);
  line-height: 1;
}
.score-circle.fail .score-value { color: var(--red-600); }

.score-denom {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: 3px;
}

.result-stats {
  display: flex;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
}

.result-stat { text-align: center; }

.result-stat-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
}
.result-stat-num.correct { color: var(--teal-600); }
.result-stat-num.wrong   { color: var(--red-400);  }

.result-stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* 逐題解析列表 */
.result-section-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.7px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.result-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 32px;
}

.result-item {
  background: var(--surface);
  border-radius: var(--r-lg);
  border: 0.5px solid var(--border);
  overflow: hidden;
}

.result-item-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  cursor: pointer;
  transition: background 0.12s;
  user-select: none;
}
.result-item-header:hover { background: var(--gray-50); }

.result-status-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
}
.result-status-icon.correct { background: var(--teal-50); color: var(--teal-600); }
.result-status-icon.wrong   { background: var(--red-50);  color: var(--red-400);  }

.result-item-label { flex: 1; }

.result-item-num {
  font-size: 13px;
  font-weight: 700;
}

.result-item-tag {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.result-wrong-ans {
  font-size: 12px;
  color: var(--red-400);
  font-weight: 600;
  margin-right: 8px;
  white-space: nowrap;
}

.result-chevron {
  font-size: 11px;
  color: var(--text-muted);
  transition: transform 0.2s;
  flex-shrink: 0;
}
.result-item.open .result-chevron { transform: rotate(180deg); }

/* 展開的詳解內容 */
.result-body {
  padding: 20px 20px 24px;
  border-top: 0.5px solid var(--border);
}

.result-q-text {
  font-size: 15px;
  line-height: 1.65;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.result-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 20px;
}

.result-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--border);
  font-size: 14px;
  background: var(--bg);
  color: var(--text-primary);
}
.result-option.correct-ans {
  background: var(--teal-50);
  border-color: var(--teal-400);
  color: var(--teal-600);
}
.result-option.user-wrong {
  background: var(--red-50);
  border-color: var(--red-400);
  color: var(--red-600);
}

.opt-letter {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  flex-shrink: 0;
  background: white;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-mono);
}
.result-option.correct-ans .opt-letter {
  background: var(--teal-400);
  border-color: var(--teal-400);
  color: white;
}
.result-option.user-wrong .opt-letter {
  background: var(--red-400);
  border-color: var(--red-400);
  color: white;
}

/* AI 解析區塊 */
.ai-block {
  background: var(--blue-50);
  border: 1.5px solid var(--blue-100);
  border-left: 4px solid var(--blue-400);
  border-radius: var(--r-md);
  padding: 16px 18px;
  margin-bottom: 16px;
}

.ai-block-title {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 700;
  color: var(--blue-800);
  margin-bottom: 10px;
}

.ai-block-content {
  font-size: 14px;
  line-height: 1.75;
  color: var(--blue-800);
}

.ai-block-content p + p { margin-top: 8px; }

.ai-block-vocab {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.vocab-pill {
  background: white;
  border: 1px solid var(--blue-100);
  border-radius: 99px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--blue-600);
  font-family: var(--font-mono);
}

/* 產生類似練習題按鈕 */
.btn-ai-practice {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--purple-600);
  color: white;
  border: none;
  border-radius: var(--r-md);
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 700;
  transition: background 0.15s, transform 0.1s;
}
.btn-ai-practice:hover  { background: var(--purple-400); }
.btn-ai-practice:active { transform: scale(0.98); }

/* 底部按鈕 */
.result-footer {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* ════════════════════════════════════════════════════════════
   LOADING 狀態
   ════════════════════════════════════════════════════════════ */
.loading-placeholder {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-muted);
  font-size: 15px;
}

/* ════════════════════════════════════════════════════════════
   RWD：手機版
   ════════════════════════════════════════════════════════════ */
@media (max-width: 680px) {
  .home-card        { padding: 40px 28px 32px; }
  .home-title       { font-size: 28px; }
  .home-btns        { grid-template-columns: 1fr; }

  .quiz-inner       { grid-template-columns: 1fr; }
  .quiz-sidebar     { order: -1; } /* 手機版導覽列移到上方 */
  .sidebar-card     { position: static; }
  .q-grid           { grid-template-columns: repeat(5, 1fr); }

  .stats-grid       { grid-template-columns: 1fr 1fr; }
  .charts-grid      { grid-template-columns: 1fr; }

  .result-options-grid { grid-template-columns: 1fr; }
  .result-stats     { gap: 20px; }
}

@media (max-width: 400px) {
  .stats-grid       { grid-template-columns: 1fr; }
  .navbar-username  { display: none; }
}

/* ════════════════════════════════════════════════
   AUTH 登入 / 註冊畫面
   ════════════════════════════════════════════════ */
.auth-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.auth-card {
  background: var(--surface);
  border-radius: var(--r-xl);
  border: 0.5px solid var(--border);
  box-shadow: var(--shadow-md);
  padding: 44px 40px 40px;
  width: 100%;
  max-width: 420px;
}

.auth-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
  justify-content: center;
}

.auth-title {
  font-family: var(--font-display);
  font-size: 26px;
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.auth-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.auth-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.auth-field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.auth-field input {
  border: 1.5px solid var(--border-strong);
  border-radius: var(--r-md);
  padding: 11px 14px;
  font-size: 15px;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s;
}

.auth-field input:focus {
  border-color: var(--blue-400);
  background: white;
}

.auth-error {
  font-size: 13px;
  color: var(--red-400);
  min-height: 18px;
  margin-bottom: 8px;
}

.auth-btn {
  width: 100%;
  padding: 13px;
  font-size: 15px;
  margin-bottom: 16px;
}

.auth-switch {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

.auth-switch a {
  color: var(--blue-600);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
.auth-switch a:hover { text-decoration: underline; }
/* ════════════════════════════════════════════════
   閱讀題（Part 7）專用樣式
   ════════════════════════════════════════════════ */

/* 作答畫面：閱讀題時切換為左文章 / 右題目的兩欄佈局 */
.quiz-reading-layout {
  display: grid;
  grid-template-columns: 45% 1fr 180px;
  max-width: 1300px;
  margin: 0 auto;
  gap: 24px;
  align-items: start;
}
/* 左欄：文章區塊，佔滿整個左欄高度 */
.quiz-article-panel {
  background: #f8fafc;
  border: 1px solid #dde3ec;
  border-radius: 14px;
  padding: 24px 28px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  position: sticky;
  top: 80px;           /* 固定在 navbar 下方，題目捲動時文章不動 */
}

.quiz-article-type-badge {
  display: inline-block;
  background: #185FA5;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 14px;
}

.quiz-article-text {
  font-family: inherit;
  font-size: 14px;
  line-height: 1.85;
  color: #2d3748;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
}

/* 閱讀題時右欄導覽列（放在作答區下方） */
.quiz-reading-nav {
  background: #fff;
  border: 1px solid #dde3ec;
  border-radius: 12px;
  padding: 16px;
  margin-top: 12px;
}

.quiz-reading-nav .q-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* 結果頁：閱讀題文章原文區塊 */
.result-article-block {
  background: #f8fafc;
  border: 1px solid #dde3ec;
  border-left: 4px solid #378ADD;
  border-radius: 10px;
  padding: 18px 20px;
  margin-bottom: 20px;
}

.result-article-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.result-article-type-badge {
  background: #185FA5;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
}

.result-article-label {
  font-size: 13px;
  color: #718096;
  font-weight: 500;
}

.result-article-text {
  font-family: inherit;
  font-size: 13px;
  line-height: 1.8;
  color: #2d3748;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
}

/* 結果頁文章翻譯展開區 */
.quiz-article-translation-toggle {
  margin-top: 16px;
  border-top: 1px dashed #cbd5e0;
  padding-top: 12px;
}

.btn-translation-toggle {
  background: none;
  border: 1px solid #378ADD;
  color: #378ADD;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 20px;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-translation-toggle:hover {
  background: rgba(55, 138, 221, 0.08);
}

.quiz-article-translation-text {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.8;
  color: #4a5568;
  white-space: pre-wrap;
  word-break: break-word;
}

/* 手機版：上下堆疊 */
@media (max-width: 768px) {
  .quiz-reading-layout {
    grid-template-columns: 1fr;
  }

  .quiz-article-panel {
    position: static;
    max-height: 45vh;
  }

  .quiz-reading-nav {
    margin-top: 0;
  }
}

/* 聽力題播放器 */
.audio-player-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 16px;
  background: #f0f4f8;
  border-radius: 12px;
  margin-bottom: 24px;
}

.audio-play-hint {
  font-size: 15px;
  font-weight: 600;
  color: #185FA5;
}

.audio-player {
  width: 100%;
  max-width: 420px;
  border-radius: 8px;
}

.audio-play-limit {
  font-size: 12px;
  color: #888;
}
.quiz-config-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 24px 0 8px;
}

.quiz-config-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 12px;
  border-radius: 12px;
  border: 2px solid var(--border);
  background: var(--bg);
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}

.quiz-config-item.active {
  border-color: var(--blue-400);
  background: var(--blue-50);
}

.quiz-config-icon { font-size: 24px; }

.quiz-config-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.quiz-config-item.active .quiz-config-label {
  color: var(--blue-600);
}

.quiz-config-num {
  width: 52px;
  text-align: center;
  border: 1.5px solid var(--blue-400);
  border-radius: 8px;
  padding: 4px;
  font-size: 16px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--blue-800);
  background: white;
}

.quiz-config-off {
  font-size: 12px;
  color: var(--gray-400);
}

.practice-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
}

.practice-modal {
  background: white;
  border-radius: 16px;
  padding: 32px 28px;
  max-width: 560px;
  width: calc(100% - 48px);
  position: relative;
  max-height: 80vh;
  overflow-y: auto;
}

.practice-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  color: #888;
}

.practice-modal-label {
  font-size: 12px;
  font-weight: 700;
  color: #7F77DD;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.practice-modal-tag {
  font-size: 12px;
  color: #888;
  margin-bottom: 8px;
}

.practice-modal-text {
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 20px;
  color: #1A1916;
}

.practice-result-block {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 10px;
  background: #f8fafc;
  border: 1px solid #dde3ec;
}

.practice-result-correct {
  font-size: 15px;
  font-weight: 700;
  color: #0F6E56;
  margin-bottom: 4px;
}

.practice-result-wrong {
  font-size: 15px;
  font-weight: 700;
  color: #A32D2D;
  margin-bottom: 4px;
}

.practice-article-block {
  background: #f8fafc;
  border: 1px solid #dde3ec;
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 16px;
  max-height: 200px;
  overflow-y: auto;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}