/* 台北捷運官方色彩 */
:root {
    /* 捷運路線色彩 */
    --metro-brown: #8B4513;       /* 文湖線 */
    --metro-red: #E60012;         /* 淡水信義線 */
    --metro-green: #008659;       /* 松山新店線 */
    --metro-orange: #F48221;      /* 中和新蘆線 */
    --metro-blue: #0070BD;        /* 板南線 */
    --metro-yellow: #FFDB00;      /* 環狀線 */
    
    /* 捷運系統色彩 */
    --metro-primary: #003976;     /* 深藍色 - 捷運主色 */
    --metro-secondary: #00A0E9;   /* 淺藍色 - 捷運輔色 */
    --metro-light-gray: #F5F5F5;  /* 淺灰色 - 背景 */
    --metro-dark-gray: #666666;   /* 深灰色 - 文字 */
    --metro-white: #FFFFFF;       /* 白色 */
    
    /* 功能色彩 */
    --success: #28a745;
    --error: #dc3545;
    --warning: #ffc107;
    --info: var(--metro-secondary);
}

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

body {
    font-family: 'Noto Sans TC', sans-serif;
    background: linear-gradient(135deg, var(--metro-primary) 0%, var(--metro-secondary) 100%);
    min-height: 100vh;
    color: var(--metro-dark-gray);
    position: relative;
}

/* 捷運線條背景裝飾 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(45deg, transparent 40%, var(--metro-red) 40%, var(--metro-red) 45%, transparent 45%),
        linear-gradient(-45deg, transparent 40%, var(--metro-green) 40%, var(--metro-green) 45%, transparent 45%),
        linear-gradient(90deg, transparent 48%, var(--metro-orange) 48%, var(--metro-orange) 52%, transparent 52%);
    opacity: 0.03;
    z-index: -1;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0;
    background: none;
    box-shadow: none;
    border-radius: 0;
}

.section {
    display: none;
    background: var(--metro-white);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 57, 118, 0.15), 0 0 0 1px rgba(0, 57, 118, 0.1);
    position: relative;
    overflow: hidden;
}

.section.active {
    display: block;
}

/* 卡片頂部裝飾線 */
.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, 
        var(--metro-red) 0%, 
        var(--metro-green) 20%, 
        var(--metro-orange) 40%, 
        var(--metro-blue) 60%, 
        var(--metro-brown) 80%, 
        var(--metro-yellow) 100%);
}

/* 主頁面樣式 */
h1 {
    color: var(--metro-primary);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-align: center;
}

.subtitle {
    color: var(--metro-dark-gray);
    font-size: 1.1rem;
    text-align: center;
    margin-bottom: 40px;
}

.main-content {
    text-align: center;
}

.stats-preview {
    margin-bottom: 30px;
    padding: 24px;
    background: linear-gradient(135deg, var(--metro-primary), var(--metro-secondary));
    border-radius: 12px;
    color: var(--metro-white);
    box-shadow: 0 8px 24px rgba(0, 57, 118, 0.2);
}

.stat-item {
    display: inline-block;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    display: block;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* 題組選擇樣式 */
.topic-selection {
    margin-bottom: 30px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    border: 2px solid rgba(0, 57, 118, 0.1);
    backdrop-filter: blur(10px);
}

.topic-selection h3 {
    color: var(--metro-primary);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
    text-align: center;
}

.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.topic-option {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: var(--metro-white);
    border: 2px solid rgba(0, 57, 118, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    font-weight: 500;
}

.topic-option:hover {
    border-color: var(--metro-secondary);
    background: rgba(0, 160, 233, 0.05);
    transform: translateY(-2px);
}

.topic-option.selected {
    border-color: var(--metro-secondary);
    background: linear-gradient(135deg, var(--metro-secondary), var(--metro-primary));
    color: var(--metro-white);
    box-shadow: 0 4px 12px rgba(0, 160, 233, 0.3);
}

.topic-option input[type="checkbox"] {
    margin-right: 10px;
    transform: scale(1.2);
}

.topic-option .topic-name {
    flex: 1;
}

.topic-option .topic-count {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-left: 8px;
}

.topic-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.topic-btn {
    padding: 8px 16px;
    background: rgba(0, 57, 118, 0.1);
    border: 2px solid var(--metro-primary);
    border-radius: 6px;
    color: var(--metro-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.topic-btn:hover {
    background: var(--metro-primary);
    color: var(--metro-white);
    transform: translateY(-1px);
}

/* 預覽收合功能 */
.preview-section {
    margin-top: 30px;
    width: 100%;
}

.toggle-preview-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 15px 20px;
    background: rgba(0, 57, 118, 0.1);
    border: 2px solid var(--metro-primary);
    border-radius: 12px;
    color: var(--metro-primary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.toggle-preview-btn:hover {
    background: rgba(0, 57, 118, 0.2);
    border-color: var(--metro-secondary);
    color: var(--metro-secondary);
    transform: translateY(-2px);
}

.toggle-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.toggle-preview-btn.expanded .toggle-icon {
    transform: rotate(180deg);
}

/* 檔案列表樣式 */
.file-list {
    margin-top: 15px;
    text-align: left;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.file-list.expanded {
    max-height: 400px;
    overflow-y: auto;
    padding: 20px;
}

.file-list.collapsed {
    max-height: 0;
    padding: 0;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    margin-bottom: 8px;
    background: var(--metro-light-gray);
    border-radius: 8px;
    border-left: 4px solid var(--metro-blue);
    transition: all 0.3s ease;
}

.file-item:hover {
    background: #E8F4FD;
    border-left-color: var(--metro-secondary);
    transform: translateX(4px);
}

.file-item img {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 6px;
    margin-right: 12px;
}

.file-item span {
    color: var(--metro-dark-gray);
    font-weight: 500;
}

/* 按鈕樣式 */
.start-btn {
    background: linear-gradient(135deg, var(--metro-red), #FF6B6B);
    color: var(--metro-white);
    border: none;
    padding: 16px 32px;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 24px rgba(230, 0, 18, 0.3);
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(230, 0, 18, 0.4);
}

/* 練習頁面樣式 */
.practice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 16px 20px;
    background: var(--metro-light-gray);
    border-radius: 12px;
    border: 1px solid rgba(0, 57, 118, 0.1);
}

.back-btn {
    background: var(--metro-secondary);
    color: var(--metro-white);
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: var(--metro-primary);
    transform: translateY(-1px);
}

.progress {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--metro-primary);
}

.score {
    font-size: 1rem;
    color: var(--metro-dark-gray);
    font-weight: 500;
}

/* Flash Card 樣式 */
.flashcard {
    perspective: 1000px;
    margin-bottom: 30px;
}

.card {
    width: 100%;
    height: 450px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
    cursor: pointer;
}

.card.flipped {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 30px;
    box-shadow: 
        0 20px 40px rgba(0, 57, 118, 0.15),
        0 0 0 1px rgba(0, 57, 118, 0.1);
}

.card-front {
    background: linear-gradient(135deg, var(--metro-white) 0%, #F8FBFF 100%);
    border: 2px solid var(--metro-secondary);
}

.card-back {
    background: linear-gradient(135deg, var(--metro-primary) 0%, var(--metro-secondary) 100%);
    color: var(--metro-white);
    transform: rotateY(180deg);
    opacity: 0;
    transition: opacity 0.1s ease 0.3s;
}

.card.flipped .card-back {
    opacity: 1;
}

#card-image {
    max-width: 95%;
    max-height: 75%;
    object-fit: contain;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 8px 24px rgba(0, 57, 118, 0.2);
    transition: opacity 0.3s ease;
    border: 3px solid var(--metro-white);
}

.card-question {
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
    color: var(--metro-primary);
    margin-top: 10px;
}

.answer {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 30px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* 按鈕樣式 */
.answer-buttons {
    display: flex;
    gap: 20px;
}

.answer-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

.answer-btn.correct {
    background: var(--success);
    color: var(--metro-white);
    box-shadow: 0 4px 16px rgba(40, 167, 69, 0.3);
}

.answer-btn.correct:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

.answer-btn.incorrect {
    background: var(--error);
    color: var(--metro-white);
    box-shadow: 0 4px 16px rgba(220, 53, 69, 0.3);
}

.answer-btn.incorrect:hover {
    background: #c82333;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.4);
}

/* 控制按鈕 */
.controls {
    text-align: center;
}

.control-btn {
    background: var(--metro-secondary);
    color: var(--metro-white);
    border: none;
    padding: 14px 28px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 25px;
    cursor: pointer;
    margin: 0 10px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(0, 160, 233, 0.3);
}

.control-btn:hover {
    background: var(--metro-primary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 160, 233, 0.4);
}

.control-btn.hidden {
    display: none;
}

/* 載入指示器 */
.loading-indicator {
    text-align: center;
    padding: 20px;
    color: var(--metro-dark-gray);
}

.loading-indicator.hidden {
    display: none;
}

.spinner {
    border: 4px solid var(--metro-light-gray);
    border-top: 4px solid var(--metro-secondary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.transition-hint {
    color: var(--metro-secondary);
    font-weight: 500;
    margin-top: 15px;
}

.transition-hint.hidden {
    display: none;
}

/* 結果頁面樣式 */
.result-content {
    text-align: center;
}

.result-content h2 {
    color: var(--metro-primary);
    font-size: 2.2rem;
    margin-bottom: 30px;
}

.result-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 40px;
    gap: 20px;
}

.stat {
    flex: 1;
    padding: 20px;
    background: linear-gradient(135deg, var(--metro-light-gray), #E8F4FD);
    border-radius: 12px;
    border-top: 4px solid var(--metro-blue);
}

.stat .stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--metro-primary);
    margin-bottom: 8px;
}

.stat .stat-label {
    color: var(--metro-dark-gray);
    font-size: 0.9rem;
    font-weight: 500;
}

.result-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.restart-btn, .new-folder-btn {
    padding: 14px 28px;
    border: none;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.restart-btn {
    background: var(--metro-green);
    color: var(--metro-white);
    box-shadow: 0 4px 16px rgba(0, 134, 89, 0.3);
}

.restart-btn:hover {
    background: #006d47;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 134, 89, 0.4);
}

.new-folder-btn {
    background: var(--metro-orange);
    color: var(--metro-white);
    box-shadow: 0 4px 16px rgba(244, 130, 33, 0.3);
}

.new-folder-btn:hover {
    background: #d46e1a;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(244, 130, 33, 0.4);
}

.exit-btn {
    background: var(--metro-orange);
    padding: 8px 16px;
    font-size: 0.95rem;
}
.exit-btn:hover {
    background: #d46e1a;
}

/* 競賽：外連連線版卡片與按鈕 */
.competition-external-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
    width: 100%;
    max-width: 720px;
    margin: 12px auto 22px auto;
    padding: 18px 20px;
    background: linear-gradient(135deg, #f6fbff 0%, #ffffff 100%);
    border-radius: 14px;
    border: 1px solid #e6effa;
    box-shadow: 0 8px 24px rgba(0, 112, 189, 0.08);
}
.competition-external-text {
    color: var(--metro-primary);
    font-weight: 700;
    font-size: 1.05rem;
}
.competition-external-btn {
    display: inline-block;
    padding: 12px 22px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--metro-blue), var(--metro-secondary));
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.5px;
    box-shadow: 0 8px 24px rgba(0, 112, 189, 0.25);
    transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.competition-external-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 112, 189, 0.35);
}
@media (max-width: 480px) {
    .competition-external-card {
        margin: 8px auto 16px auto;
        padding: 14px 12px;
    }
    .competition-external-text {
        font-size: 1rem;
    }
    .competition-external-btn {
        padding: 10px 16px;
        font-weight: 700;
    }
}

/* 導覽列樣式 */
.navbar {
    width: 100%;
    background: linear-gradient(90deg, var(--metro-primary), var(--metro-secondary));
    box-shadow: 0 2px 12px rgba(0, 57, 118, 0.08);
    padding: 0 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    height: 60px;
}

.navbar-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--metro-white);
    letter-spacing: 1px;
    text-decoration: none;
    border-radius: 8px;
    padding: 4px 12px;
    transition: background 0.2s, color 0.2s;
}

.navbar-title:hover,
.navbar-title.active {
    background: transparent;
    color: var(--metro-white);
    box-shadow: 0 2px 8px rgba(0, 57, 118, 0.10);
    transform: translateY(-2px);
    text-decoration: none;
}

.navbar-links {
    display: flex;
    gap: 32px;
}

.navbar-links a {
    color: var(--metro-white);
    font-size: 1.1rem;
    font-weight: 500;
    text-decoration: none;
    padding: 8px 18px;
    border-radius: 8px;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    letter-spacing: 1px;
    box-shadow: none;
    position: relative;
}

.navbar-links a:hover,
.navbar-links a.active {
    background: var(--metro-yellow);
    color: var(--metro-primary);
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(255, 219, 0, 0.15);
    text-decoration: none;
}

/* --- Navbar Burger (漢堡選單) 樣式 --- */
.navbar-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  z-index: 1100;
}
.burger-bar {
  width: 26px;
  height: 3px;
  background: #0070BD;
  margin: 4px 0;
  border-radius: 2px;
  transition: 0.3s;
  display: block;
}
/* 修正手機版導覽列顯示行為 */
@media (max-width: 768px) {
  .navbar-links {
    display: none;
    position: absolute;
    top: 54px;
    right: 8px;
    left: 8px;
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 8px 32px rgba(0,112,189,0.13), 0 2px 12px rgba(0,0,0,0.10);
    overflow: hidden;
    margin-top: 12px;
    flex-direction: column;
    width: auto;
    z-index: 1000;
    padding: 0;
    transition: opacity 0.18s, transform 0.18s;
    opacity: 0;
    pointer-events: none;
  }
  .navbar-links.open {
    display: flex;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .navbar-links.open a {
    color: var(--metro-primary) !important;
    background: none;
    padding: 20px 28px;
    border-bottom: 1px solid #f0f2f6;
    border-radius: 0;
    display: block;
    text-align: left;
    font-weight: 700;
    font-size: 1.12rem;
    letter-spacing: 1px;
    transition: background 0.18s, color 0.18s;
  }
  .navbar-links.open a:last-child {
    border-bottom: none;
  }
  .navbar-links.open a:hover {
    background: linear-gradient(90deg, #eaf6ff 0%, #f3f8fd 100%);
    color: #0070BD !important;
  }
  .navbar-burger {
    display: flex !important;
    z-index: 1101;
  }
  .navbar-container {
    position: relative;
  }
}
/* 移除/合併重複的 .navbar-links 響應式設定，避免 display 被覆蓋 */
@media (max-width: 768px) {
    .navbar-container {
        padding: 0 10px;
        height: 48px;
    }
    .navbar-title {
        font-size: 1.1rem;
    }
    .navbar-links {
        gap: 12px;
    }
    .navbar-links a {
        font-size: 0.95rem;
        padding: 6px 10px;
    }
}

/* 響應式設計 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .section {
        padding: 25px 20px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .card {
        height: 350px;
    }
    
    #card-image {
        max-height: 65%;
    }
    
    .answer {
        font-size: 1.8rem;
    }
    
    .result-stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .result-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .answer-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .practice-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}

/* Footer 樣式 */
.footer {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding: 15px 0;
    text-align: center;
    margin-top: 20px;
}

.footer-text {
    color: #fff;
    font-size: 0.9rem;
    margin: 0;
}

.footer-link {
    color: #fff;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-link:hover {
    color: #ffd600;
    text-decoration: underline;
}

/* Terms 和 Privacy 頁面樣式 */
.terms-content,
.privacy-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    line-height: 1.6;
}

.terms-section,
.privacy-section {
    margin-bottom: 40px;
}

.terms-section h2,
.privacy-section h2 {
    color: #0070BD;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.terms-section p,
.privacy-section p {
    margin-bottom: 15px;
}

.terms-section ul,
.privacy-section ul {
    margin-left: 20px;
    margin-bottom: 20px;
}

.terms-section li,
.privacy-section li {
    margin-bottom: 10px;
}

.discord-cmd {
    background-color: #f0f0f0;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    color: #333;
}

/* Q&A Accordion 樣式 */
.qa-accordion-list {
    max-width: 700px;
    margin: 32px auto 0 auto;
    text-align: left;
}
.qa-accordion {
    margin-bottom: 18px;
    border-radius: 14px;
    box-shadow: 0 2px 12px rgba(0,57,118,0.08), 0 0 0 1px rgba(0,57,118,0.07);
    background: #fff;
    overflow: hidden;
    transition: box-shadow 0.2s;
}
.qa-accordion.open {
    box-shadow: 0 6px 24px rgba(0,57,118,0.13), 0 0 0 2px var(--qa-color, #0070BD);
}
.qa-question {
    width: 100%;
    background: linear-gradient(0deg, rgba(255,255,255,0.18), rgba(255,255,255,0.18)), var(--qa-color, #0070BD);
    color: #fff;
    font-size: 1.13rem;
    font-weight: 600;
    border: none;
    outline: none;
    padding: 18px 24px;
    cursor: pointer;
    text-align: left;
    border-radius: 14px 14px 0 0;
    transition: background 0.2s, color 0.2s;
    position: relative;
    box-shadow: none;
}
.qa-question::after {
    content: '▼';
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%) rotate(0deg);
    font-size: 1.1rem;
    color: #fff;
    transition: transform 0.3s;
}
.qa-accordion.open .qa-question::after {
    transform: translateY(-50%) rotate(180deg);
}
.qa-question:hover, .qa-accordion.open .qa-question {
    background: linear-gradient(0deg, rgba(255,255,255,0.32), rgba(255,255,255,0.32)), var(--qa-color, #0070BD);
    color: var(--qa-color, #0070BD);
}
.qa-answer {
    background: #f8fbff;
    color: #333;
    font-size: 1.08rem;
    padding: 20px 28px 22px 28px;
    border-radius: 0 0 14px 14px;
    border-top: 1px solid #e0e7ef;
    display: none;
    animation: qa-fadein 0.4s;
}
.qa-accordion.open .qa-answer {
    display: block;
}
@keyframes qa-fadein {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.qa-answer a {
    color: #fff;
    background: linear-gradient(90deg, var(--metro-blue) 60%, var(--metro-secondary) 100%);
    padding: 4px 14px;
    border-radius: 18px;
    font-weight: 600;
    text-decoration: none;
    margin: 0 4px;
    box-shadow: 0 2px 8px rgba(0,112,189,0.10);
    transition: background 0.2s, color 0.2s, box-shadow 0.2s, transform 0.2s;
    display: inline-block;
    position: relative;
    top: -1px;
}
.qa-answer a:hover {
    background: linear-gradient(90deg, var(--metro-yellow) 0%, var(--metro-orange) 100%);
    color: var(--metro-primary);
    box-shadow: 0 4px 16px rgba(255,219,0,0.18);
    transform: translateY(-2px) scale(1.05);
    text-decoration: none;
}

.qa-answer .discord-cmd {
    display: inline-block;
    background: #f3f4f6;
    color: #333;
    font-family: 'JetBrains Mono', 'Fira Mono', 'Consolas', 'monospace';
    font-size: 1em;
    padding: 2px 10px 2px 9px;
    border-radius: 8px;
    margin: 0 2px;
    font-weight: 500;
    letter-spacing: 0.2px;
    box-shadow: none;
    border: 1px solid #e0e0e0;
    transition: background 0.18s, color 0.18s, border 0.18s;
    vertical-align: middle;
}
.qa-answer .discord-cmd:hover {
    background: #e0e7ef;
    color: #222;
    border-color: #bfc7d1;
}

/* 教學卡片內嵌圖片不超出白色卡片 */
#wild-ball-tutorial img,
.markdown-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 18px auto;
    border-radius: 10px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.10);
    box-sizing: border-box;
}

/* 競賽模式樣式 */
.competition-setup {
  text-align: center;
  margin: 40px 0 20px 0;
}
.competition-select {
  margin-bottom: 24px;
}
.competition-count-btn {
  margin: 0 8px;
  padding: 8px 20px;
  font-size: 1.1rem;
  border-radius: 6px;
  border: 1px solid #0070BD;
  background: #fff;
  color: #0070BD;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.competition-count-btn.selected,
.competition-count-btn:active {
  background: #0070BD;
  color: #fff;
}
#competition-start-btn {
  font-size: 1.2rem;
  padding: 10px 36px;
  margin-top: 10px;
}
.competition-game {
  text-align: center;
  margin-top: 30px;
}
.competition-header {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  font-size: 1.3rem;
  margin-bottom: 20px;
}
.competition-image-area {
  margin-bottom: 20px;
}
.competition-image {
  max-width: 480px;
  max-height: 320px;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  background: #f8f8f8;
}
.competition-input-area {
  margin-top: 20px;
  text-align: center;
}
#competition-answer {
  display: block;
  margin: 0 auto;
  font-size: 1.3rem;
  padding: 10px 20px;
  border-radius: 25px;
  border: 1px solid #ccc;
  width: 280px;
  outline: none;
  transition: all 0.2s;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}
#competition-answer:focus {
    border-color: var(--metro-secondary);
    box-shadow: 0 0 0 3px rgba(0, 160, 233, 0.2), inset 0 2px 4px rgba(0,0,0,0.06);
}
.competition-feedback {
  display: inline-block;
  margin-left: 16px;
  color: #E60012;
  font-weight: 600;
  font-size: 1.1rem;
  min-width: 48px;
}
.competition-result {
  text-align: center;
  margin-top: 40px;
}
.competition-final-time {
  font-size: 1.5rem;
  margin: 24px 0 32px 0;
  color: #0070BD;
}
#competition-restart-btn {
  font-size: 1.1rem;
  padding: 10px 32px;
}

/* 讓所有 .hidden class 都隱藏 */
.hidden {
  display: none !important;
}