/* 簡約品牌色風格 CSS Variables */
:root {
    --bg-canvas: #DFDFDF;
    --panel-color: #FFFFFF;
    --text-dark: #333333;
    --accent-color: #D69396;
    --shadow-color: #B07C7F;
    --font-style: 'Inter', sans-serif;
    --border-radius: 6px;
}

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

body {
    font-family: var(--font-style);
    background: var(--bg-canvas);
    min-height: 100vh;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    transition: background 0.3s ease;
    position: relative;
    overflow: hidden; /* 完全防止滾動 */
}

body > .container {
    position: relative;
    z-index: 1;
}

.container {
    background: var(--panel-color);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    padding: 32px;
    max-width: 700px;
    width: 100%;
    max-height: 95vh;
    height: auto;
    overflow-y: auto; /* 允許垂直滾動 */
    overflow-x: hidden; /* 防止水平滾動 */
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    text-align: center;
    color: var(--text-dark);
    margin-bottom: 24px;
    font-size: 2em;
    font-weight: 600;
}

h2 {
    text-align: center;
    color: var(--text-dark);
    margin-bottom: 20px;
    font-size: 1.5em;
    font-weight: 600;
}

.hidden {
    display: none !important;
}

/* 品牌標誌 */
.brand-logo {
    position: fixed;
    top: 16px;
    left: 16px;
    font-family: var(--font-style);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-dark);
    opacity: 0.7;
    z-index: 10;
    letter-spacing: 0.5px;
}

/* 音效開關按鈕 */
.sound-toggle {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 8px 12px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 18px;
    transition: all 0.2s ease;
    z-index: 10;
    box-shadow: 0 3px 0 var(--shadow-color);
}

.sound-toggle:hover {
    background: #C88488;
    transform: translateY(-1px) scale(1.1);
}

.sound-toggle:active {
    transform: translateY(3px);
    box-shadow: 0 0 0 var(--shadow-color);
}

/* 開始畫面 */
.welcome-text {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.welcome-text p {
    font-size: 1em;
    color: #666;
    margin-bottom: 20px;
}

.welcome-text .btn {
    margin: 10px auto;
    display: block;
    max-width: 400px;
    width: 100%;
}

/* 名稱輸入 */
.name-input-section {
    margin: 20px 0;
}

.name-input-section label {
    display: block;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 10px;
}

#name-input {
    width: 100%;
    padding: 12px;
    font-size: 1em;
    font-family: var(--font-style);
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    transition: border-color 0.3s ease;
}

#name-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* 難度選擇 */
.difficulty-section {
    margin: 20px 0;
}

.difficulty-section label {
    display: block;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.difficulty-options {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.difficulty-btn {
    flex: 1;
    min-width: 150px;
    padding: 15px 10px;
    background: white;
    border: 3px solid #ddd;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-style);
    box-shadow: 0 2px 0 #ccc;
}

.difficulty-btn:hover {
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.difficulty-btn:active {
    transform: translateY(2px);
    box-shadow: 0 0 0 #ccc;
}

.difficulty-btn.selected {
    border-color: var(--accent-color);
    background: var(--accent-color);
    color: white;
    box-shadow: 0 3px 0 var(--shadow-color);
}

.diff-name {
    font-size: 1.1em;
    font-weight: 700;
    margin-bottom: 5px;
}

.diff-desc {
    font-size: 0.85em;
    opacity: 0.9;
}

/* 按鈕樣式 - 統一設計 */
.btn {
    padding: 14px 32px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    font-family: var(--font-style);
    text-align: center;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 3px 0 var(--shadow-color);
}

.btn-primary:hover {
    background: #C88488;
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(3px);
    box-shadow: 0 0 0 var(--shadow-color);
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: #9B9B9B;
    color: white;
    box-shadow: 0 3px 0 #7A7A7A;
}

.btn-secondary:hover {
    background: #858585;
    transform: translateY(-1px);
}

.btn-secondary:active {
    transform: translateY(3px);
    box-shadow: 0 0 0 #7A7A7A;
}

.btn-secondary:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-daily {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 3px 0 #5a4a8a;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-daily:hover {
    background: linear-gradient(135deg, #5568d3 0%, #65408b 100%);
    transform: translateY(-1px);
}

.btn-daily:active {
    transform: translateY(3px);
    box-shadow: 0 0 0 #5a4a8a;
}

.daily-status {
    font-size: 12px;
    opacity: 0.9;
}

.btn-hint {
    background: var(--accent-color);
    color: white;
    font-size: 15px;
    padding: 12px 24px;
    font-family: var(--font-style);
    font-weight: 500;
    box-shadow: 0 3px 0 var(--shadow-color);
}

.btn-hint:hover:not(:disabled) {
    background: #C88488;
    transform: translateY(-1px);
}

.btn-hint:active:not(:disabled) {
    transform: translateY(3px);
    box-shadow: 0 0 0 var(--shadow-color);
}

.btn-hint:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    opacity: 0.5;
    box-shadow: none;
}

/* 關卡資訊橫幅 */
.stage-info-banner {
    text-align: center;
    padding: 12px 20px;
    background: var(--accent-color);
    color: white;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    font-family: var(--font-style);
    font-weight: 600;
    font-size: 1.1em;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.stage-info-banner .separator {
    margin: 0 10px;
    opacity: 0.7;
}

#stage-number {
    color: white;
}

#stage-name {
    color: white;
}

/* 遊戲狀態列 */
.game-status {
    display: flex;
    justify-content: space-around;
    background: #f8f9fa;
    border-radius: 8px;
    padding: 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 0.85em;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.status-item .label {
    color: #666;
    font-weight: 500;
}

.status-item span:not(.label) {
    color: var(--accent-color);
    font-weight: bold;
}

/* 國旗顯示區 */
.flag-display {
    text-align: center;
    margin: 15px 0 10px 0;
    contain: layout style; /* 效能優化：隔離重繪 */
}

#flag-emoji {
    font-size: 80px;
    margin-bottom: 10px;
    animation: flagEntrance 0.8s ease-out;
    cursor: pointer;
    transition: transform 0.3s ease;
    will-change: transform; /* 效能優化：預告瀏覽器即將變換 */
    contain: layout style paint; /* 效能優化：隔離渲染 */
}

#flag-emoji:hover {
    transform: scale(1.15) rotate(5deg);
}

@keyframes flagEntrance {
    0% {
        transform: scale(0) rotate(-180deg) translateZ(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2) rotate(10deg) translateZ(0);
    }
    100% {
        transform: scale(1) rotate(0deg) translateZ(0);
        opacity: 1;
    }
}
/* 效能優化：translateZ(0) 啟用硬體加速 */

@keyframes bounce {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.question-text {
    font-size: 1.1em;
    color: #555;
    font-weight: 500;
}

/* 提示區域 */
.hints-area {
    margin: 10px 0;
    min-height: 30px;
    max-height: none;
    overflow: visible;
}

.hint {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 6px 10px;
    margin: 4px 0;
    border-radius: 5px;
    animation: slideIn 0.3s ease-out;
    font-size: 0.85em;
    line-height: 1.3;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 回饋訊息 */
.feedback {
    padding: 10px;
    border-radius: 8px;
    margin: 10px 0;
    font-size: 0.95em;
    font-weight: 600;
    text-align: center;
    animation: slideIn 0.3s ease-out;
}

.feedback.correct {
    background: linear-gradient(135deg, #d4edda 0%, #a8e6cf 100%);
    color: #155724;
    border: 3px solid #28a745;
    animation: correctBounce 0.6s ease-out;
    box-shadow: 0 5px 20px rgba(40, 167, 69, 0.4);
}

.feedback.wrong {
    background: linear-gradient(135deg, #f8d7da 0%, #ffb3ba 100%);
    color: #721c24;
    border: 3px solid #dc3545;
    animation: wrongShakeStrong 0.6s ease-out;
    box-shadow: 0 5px 20px rgba(220, 53, 69, 0.4);
}

@keyframes correctBounce {
    0%, 100% {
        transform: scale(1);
    }
    25% {
        transform: scale(1.1) rotate(2deg);
    }
    50% {
        transform: scale(0.95) rotate(-2deg);
    }
    75% {
        transform: scale(1.05) rotate(1deg);
    }
}

@keyframes wrongShakeStrong {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-10px) rotate(-2deg);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(10px) rotate(2deg);
    }
}

/* 選項按鈕區域 */
.options-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 12px 0;
}

.option-btn {
    padding: 16px;
    font-size: 16px;
    font-weight: 500;
    font-family: var(--font-style);
    background: var(--panel-color);
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-dark);
    box-shadow: 0 2px 0 var(--shadow-color);
}

.option-btn:hover:not(:disabled) {
    background: var(--accent-color);
    color: white;
    transform: translateY(-1px);
}

.option-btn:active:not(:disabled) {
    transform: translateY(2px);
    box-shadow: 0 0 0 var(--shadow-color);
}

.option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.option-btn.correct {
    background: #28a745;
    border-color: #28a745;
    color: white;
    animation: correctPulse 0.5s ease;
}

.option-btn.wrong {
    background: #dc3545;
    border-color: #dc3545;
    color: white;
    animation: wrongShake 0.5s ease;
}

@keyframes correctPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes wrongShake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-10px);
    }
    75% {
        transform: translateX(10px);
    }
}

/* 提示按鈕區 */
.hint-buttons {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin: 10px 0 12px 0;
    flex-wrap: wrap;
}

/* 遊戲控制按鈕區 */
.game-control-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin: 12px auto 10px auto;
    flex-wrap: wrap;
    max-width: 500px;
}

.game-control-buttons .btn {
    flex: 1;
    min-width: 180px;
}

#next-btn {
    /* 繼承 .btn 的統一樣式 */
}

#quit-btn {
    /* 繼承 .btn 的統一樣式 */
}

/* 結束畫面 */
.final-result {
    text-align: center;
    margin: 20px 0;
}

.final-score {
    margin-bottom: 30px;
}

.final-score h3 {
    color: var(--accent-color);
    margin-bottom: 10px;
}

#final-score-value {
    font-size: 3.5em;
    font-weight: bold;
    color: var(--accent-color);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.title-section {
    background: var(--accent-color);
    color: white;
    padding: 25px;
    border-radius: var(--border-radius);
    margin: 15px 0;
    box-shadow: 0 4px 0 var(--shadow-color);
}

#title-badge {
    font-size: 2.5em;
    margin: 15px 0;
}

#title-description {
    font-size: 1em;
    line-height: 1.5;
    margin-top: 10px;
}

.end-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 20px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.end-buttons .btn {
    flex: 1;
    min-width: 180px;
}

/* 排行榜 */
.leaderboard-filter {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin: 20px 0;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 20px;
    background: white;
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 600;
    font-family: var(--font-style);
    color: var(--accent-color);
    font-size: 0.95em;
    box-shadow: 0 2px 0 var(--shadow-color);
}

.filter-btn:hover {
    background: #F5E5E6;
    transform: translateY(-1px);
}

.filter-btn:active {
    transform: translateY(2px);
    box-shadow: 0 0 0 var(--shadow-color);
}

.filter-btn.active {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 3px 0 var(--shadow-color);
}

.leaderboard-content {
    margin: 20px 0;
    overflow: hidden; /* 防止滾動 */
}

#leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

#leaderboard-table th {
    background: var(--accent-color);
    color: white;
    padding: 12px;
    text-align: left;
    font-weight: 600;
    font-family: var(--font-style);
}

#leaderboard-table td {
    padding: 10px 12px;
    border-bottom: 1px solid #eee;
}

#leaderboard-table tbody tr:hover {
    background: #f8f9fa;
}

#leaderboard-table tbody tr:nth-child(1) td:first-child {
    color: #FFD700;
    font-weight: bold;
    font-size: 1.2em;
}

#leaderboard-table tbody tr:nth-child(2) td:first-child {
    color: #C0C0C0;
    font-weight: bold;
    font-size: 1.1em;
}

#leaderboard-table tbody tr:nth-child(3) td:first-child {
    color: #CD7F32;
    font-weight: bold;
    font-size: 1.1em;
}

/* 響應式設計 - 手機版優化（完全無滾動） */
@media (max-width: 768px) {
    body {
        padding: 0;
        align-items: flex-start;
        height: 100vh;
        overflow: hidden; /* 防止任何滾動 */
    }

    .container {
        padding: 10px;
        max-height: 100vh;
        height: 100vh;
        margin: 0;
        border-radius: 0;
        overflow: hidden; /* 完全防止滾動 */
        display: flex;
        flex-direction: column;
    }

    h1 {
        font-size: 1.2em;
        margin-bottom: 8px;
    }

    h2 {
        font-size: 1.1em;
        margin-bottom: 8px;
    }

    /* 國旗顯示區優化 */
    #flag-emoji {
        font-size: 55px;
        margin-bottom: 5px;
    }

    .flag-display {
        margin: 8px 0 5px 0;
    }

    .question-text {
        font-size: 0.85em;
        margin: 0;
    }

    /* 關卡資訊橫幅 */
    .stage-info-banner {
        padding: 5px 8px;
        font-size: 0.75em;
        margin-bottom: 6px;
    }

    .stage-info-banner .separator {
        margin: 0 4px;
    }

    /* 遊戲狀態列 */
    .game-status {
        padding: 5px;
        margin-bottom: 6px;
        gap: 4px;
        font-size: 0.7em;
        flex-wrap: wrap;
    }

    .status-item {
        gap: 2px;
        min-width: auto;
    }

    .status-item .label {
        font-size: 0.9em;
    }

    /* 選項按鈕 */
    .options-area {
        grid-template-columns: 1fr;
        gap: 6px;
        margin: 6px 0;
    }

    .option-btn {
        padding: 10px;
        font-size: 13px;
    }

    /* 提示區域 */
    .hints-area {
        margin: 6px 0;
        min-height: auto;
        max-height: none;
        overflow: visible;
    }

    .hint {
        padding: 6px 10px;
        margin: 4px 0;
        font-size: 0.75em;
        line-height: 1.3;
    }

    /* 提示按鈕 */
    .hint-buttons {
        gap: 4px;
        margin: 6px 0;
        flex-wrap: wrap;
        flex-direction: row;
    }

    .btn-hint {
        font-size: 11px;
        padding: 6px 8px;
        flex: 1 1 calc(33.33% - 4px);
        min-width: calc(33.33% - 4px);
        box-shadow: 0 2px 0 var(--shadow-color);
    }

    /* 遊戲控制按鈕 */
    .game-control-buttons {
        gap: 6px;
        margin: 6px 0;
        flex-direction: row;
    }

    #next-btn {
        padding: 8px 16px;
        font-size: 0.9em;
        flex: 1;
    }

    #quit-btn {
        padding: 8px 16px;
        font-size: 0.85em;
        flex: 1;
    }

    /* 回饋訊息 */
    .feedback {
        padding: 8px;
        margin: 6px 0;
        font-size: 0.85em;
        line-height: 1.3;
    }

    /* 難度選擇 */
    .difficulty-options {
        flex-direction: column;
        gap: 6px;
    }

    .difficulty-btn {
        min-width: 100%;
        padding: 10px 8px;
    }

    /* 關卡選擇 */
    .stages-container {
        gap: 8px;
        margin: 10px 0;
    }

    .stage-card {
        padding: 12px;
    }

    .stage-name {
        font-size: 1em;
    }

    .stage-description {
        font-size: 0.8em;
        margin-bottom: 8px;
    }

    .stage-info {
        gap: 10px;
        font-size: 0.8em;
    }

    /* 結束畫面 */
    .final-result {
        margin: 10px 0;
    }

    .final-score {
        margin-bottom: 15px;
    }

    #final-score-value {
        font-size: 1.8em;
    }

    .title-section {
        padding: 15px;
        margin: 8px 0;
    }

    #title-badge {
        font-size: 1.8em;
        margin: 8px 0;
    }

    #title-description {
        font-size: 0.85em;
        line-height: 1.4;
    }

    .end-buttons {
        flex-direction: column;
        gap: 6px;
        margin-top: 10px;
    }

    .btn {
        width: 100%;
        margin: 0;
        padding: 8px 16px;
        font-size: 13px;
    }

    /* 按鈕統一樣式 */
    .btn-primary, .btn-secondary, .btn-daily {
        width: 100%;
    }

    /* 名稱輸入 */
    .name-input-section {
        margin: 10px 0;
    }

    .name-input-section label {
        font-size: 0.9em;
        margin-bottom: 6px;
    }

    #name-input {
        padding: 8px;
        font-size: 13px;
    }

    /* 歡迎文字 */
    .welcome-text h2 {
        font-size: 1.1em;
    }

    .welcome-text p {
        font-size: 0.85em;
        margin-bottom: 10px;
    }

    /* 音效開關按鈕 */
    .sound-toggle {
        top: 6px;
        right: 6px;
        padding: 4px 8px;
        font-size: 16px;
        box-shadow: 0 2px 0 var(--shadow-color);
    }

    /* 品牌標誌 */
    .brand-logo {
        top: 6px;
        left: 6px;
        font-size: 8px;
    }

    /* 排行榜 */
    .leaderboard-filter {
        gap: 4px;
        margin: 10px 0;
    }

    .filter-btn {
        padding: 6px 10px;
        font-size: 0.8em;
    }

    #leaderboard-table {
        font-size: 0.8em;
    }

    #leaderboard-table th,
    #leaderboard-table td {
        padding: 6px 4px;
    }

    /* 關卡選擇標題 */
    #stage-select-subtitle {
        font-size: 0.85em;
        margin-bottom: 10px;
    }

    /* 開始畫面按鈕 */
    #enter-stage-btn {
        margin-top: 10px;
    }
}

/* 超小螢幕優化（iPhone SE 等） */
@media (max-width: 375px) {
    .container {
        padding: 8px;
    }

    h1 {
        font-size: 1.1em;
        margin-bottom: 6px;
    }

    #flag-emoji {
        font-size: 50px;
        margin-bottom: 4px;
    }

    .btn-hint {
        font-size: 10px;
        padding: 5px 6px;
    }

    .stage-info-banner {
        font-size: 0.7em;
        padding: 4px 6px;
    }

    .game-status {
        font-size: 0.65em;
        padding: 4px;
    }

    .brand-logo {
        font-size: 7px;
    }

    .option-btn {
        padding: 8px;
        font-size: 12px;
    }

    .hint {
        padding: 5px 8px;
        font-size: 0.7em;
    }

    .feedback {
        padding: 6px;
        font-size: 0.8em;
    }
}

/* 關卡選擇畫面 */
#stage-select-subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 1em;
}

.stages-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin: 20px 0;
}

.stage-card {
    background: var(--panel-color);
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

.stage-card.unlocked {
    border-color: var(--accent-color);
    cursor: pointer;
}

.stage-card.unlocked:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(214, 147, 150, 0.3);
}

.stage-card.locked {
    background: #f5f5f5;
    border-color: #ccc;
    cursor: not-allowed;
    opacity: 0.6;
}

.stage-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.stage-name {
    font-size: 1.3em;
    font-weight: 600;
    color: var(--accent-color);
    font-family: var(--font-style);
}

.stage-card.locked .stage-name {
    color: #999;
}

.stage-lock {
    font-size: 1.5em;
}

.stage-description {
    color: #666;
    margin-bottom: 15px;
    font-size: 0.95em;
}

.stage-info {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 0.9em;
}

.stage-info-item {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #555;
}

.stage-info-item strong {
    color: var(--accent-color);
}

.stage-card.locked .stage-info-item strong {
    color: #999;
}

.stage-progress {
    margin-top: 10px;
    font-size: 0.85em;
    color: #28a745;
    font-weight: 600;
}

@media (max-width: 768px) {
    .stages-container {
        gap: 10px;
    }

    .stage-card {
        padding: 15px;
    }

    .stage-name {
        font-size: 1.1em;
    }
}

/* 容器滾動條樣式 */
.container::-webkit-scrollbar {
    width: 8px;
}

.container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.container::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

.container::-webkit-scrollbar-thumb:hover {
    background: var(--shadow-color);
}

.container {
    scrollbar-width: thin;  /* Firefox - 使用細滾動條 */
    scrollbar-color: var(--accent-color) #f1f1f1;  /* Firefox */
}

/* 成就通知 */
.achievement-notification {
    position: fixed;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    color: #333;
    padding: 20px 30px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(255, 215, 0, 0.4);
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 9999;
    min-width: 300px;
    transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    border: 3px solid #FFF;
}

.achievement-notification.show {
    top: 80px;
    animation: achievementPop 0.6s ease-out;
}

@keyframes achievementPop {
    0% {
        transform: translateX(-50%) scale(0.5) rotate(-10deg);
        opacity: 0;
    }
    50% {
        transform: translateX(-50%) scale(1.1) rotate(5deg);
    }
    100% {
        transform: translateX(-50%) scale(1) rotate(0deg);
        opacity: 1;
    }
}

.achievement-icon {
    font-size: 40px;
    animation: achievementIconSpin 1s ease-in-out infinite alternate;
}

@keyframes achievementIconSpin {
    0% {
        transform: rotate(-10deg) scale(1);
    }
    100% {
        transform: rotate(10deg) scale(1.1);
    }
}

.achievement-content {
    flex: 1;
}

.achievement-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 5px;
    color: #333;
}

.achievement-desc {
    font-size: 14px;
    color: #666;
    font-weight: 500;
}

@media (max-width: 768px) {
    .achievement-notification {
        min-width: 280px;
        padding: 15px 20px;
    }

    .achievement-notification.show {
        top: 60px;
    }

    .achievement-icon {
        font-size: 32px;
    }

    .achievement-title {
        font-size: 16px;
    }

    .achievement-desc {
        font-size: 12px;
    }
}

/* 世界地圖按鈕 */
.map-toggle {
    position: absolute;
    top: 16px;
    right: 70px;
    padding: 8px 12px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 20px;
    transition: all 0.2s ease;
    z-index: 10;
    box-shadow: 0 3px 0 var(--shadow-color);
}

.map-toggle:hover {
    background: #C88488;
    transform: translateY(-1px) scale(1.1);
}

.map-toggle:active {
    transform: translateY(3px);
    box-shadow: 0 0 0 var(--shadow-color);
}

/* 世界地圖畫面 */
.map-subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 1em;
}

.world-map-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin: 20px 0;
}

/* 地圖圖片容器 */
.world-map-image {
    position: relative;
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin-bottom: 20px;
}

.map-background {
    width: 100%;
    height: auto;
    display: block;
}

/* 圖釘層 */
.map-pins {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

/* 單個圖釘 */
.map-pin {
    position: absolute;
    font-size: 24px;
    cursor: pointer;
    pointer-events: auto;
    transform: translate(-50%, -100%);
    animation: pinDrop 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    transition: transform 0.2s ease;
    filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.3));
}

.map-pin:hover {
    transform: translate(-50%, -100%) scale(1.3);
    filter: drop-shadow(3px 3px 6px rgba(0, 0, 0, 0.5));
}

/* 圖釘下落動畫 */
@keyframes pinDrop {
    0% {
        opacity: 0;
        transform: translate(-50%, -200%) scale(0.3);
    }
    60% {
        transform: translate(-50%, -90%) scale(1.1);
    }
    80% {
        transform: translate(-50%, -105%) scale(0.95);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -100%) scale(1);
    }
}

/* 圖釘提示框 */
.pin-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    margin-bottom: 5px;
    transition: opacity 0.2s ease;
}

.map-pin:hover .pin-tooltip {
    opacity: 1;
}

/* 地圖覆蓋層 */
.map-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

/* 大洲區域覆蓋層 */
.region-overlay {
    position: absolute;
    cursor: pointer;
    pointer-events: auto;
    transition: all 0.3s ease;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.region-overlay:hover {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(2px);
    transform: scale(1.05);
    z-index: 10;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.4);
}

.region-overlay.unlocked {
    background: rgba(154, 205, 50, 0.3);
    box-shadow: 0 0 15px rgba(154, 205, 50, 0.6);
    animation: regionUnlock 0.8s ease-out;
}

@keyframes regionUnlock {
    0% {
        opacity: 0.3;
        transform: scale(0.95);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.region-info {
    text-align: center;
    pointer-events: none;
}

.region-label {
    font-size: 16px;
    font-weight: 700;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
    margin-bottom: 3px;
}

.region-progress-text {
    font-size: 12px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.8);
}

/* 解鎖統計 */
.unlock-stats {
    background: white;
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.unlock-stats h3 {
    color: var(--accent-color);
    margin-bottom: 15px;
    text-align: center;
    font-size: 1.2em;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #eee;
    font-size: 1em;
}

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

.stat-item span:first-child {
    color: #666;
    font-weight: 500;
}

.stat-item span:last-child {
    color: var(--accent-color);
    font-weight: 600;
}

/* 已解鎖國家展示 */
.unlocked-countries {
    background: white;
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    margin-top: 20px;
}

.unlocked-countries h3 {
    color: var(--accent-color);
    margin-bottom: 15px;
    text-align: center;
    font-size: 1.2em;
}

.unlocked-flags-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.unlocked-flag-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 10px;
    background: var(--bg-canvas);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    cursor: pointer;
}

.unlocked-flag-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.unlocked-flag-item .flag-emoji {
    font-size: 32px;
}

.unlocked-flag-item .country-name {
    font-size: 12px;
    color: var(--text-dark);
    text-align: center;
    font-weight: 500;
}

/* 手機版地圖樣式 */
@media (max-width: 768px) {
    .map-toggle {
        top: 6px;
        right: 60px;
        padding: 4px 8px;
        font-size: 18px;
    }

    .world-map {
        height: 350px;
    }

    .map-region {
        padding: 8px 10px;
    }

    .region-name {
        font-size: 0.75em;
    }

    .region-progress {
        font-size: 0.65em;
    }

    /* 調整移動端大洲位置 */
    #region-north-america {
        width: 24%;
        left: 6%;
    }

    #region-south-america {
        width: 20%;
        left: 12%;
    }

    #region-europe {
        width: 18%;
        left: 43%;
    }

    #region-africa {
        width: 22%;
        left: 41%;
    }

    #region-asia {
        width: 38%;
        left: 58%;
    }

    #region-oceania {
        width: 18%;
        left: 68%;
    }

    .unlock-stats {
        padding: 15px;
    }

    .stat-item {
        font-size: 0.9em;
    }
}