:root {
    --primary: #04AA6D;
    --secondary: #5A67D8;
    --success: #28A745;
    --warning: #FFC107;
    --danger: #DC3545;
    --light: #F8F9FA;
    --dark: #121212;
    --text-light: #F8F9FA;
    --text-dark: #212529;
    --transition: all 0.3s ease;
}

/* 基礎樣式 */
body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--light);
    color: var(--text-dark);
    margin: 0;
    padding: 0 0 100px;
    text-align: center;
    transition: var(--transition);
}

/* 按鈕樣式 */
#loadMoreBtn {
    margin-top: 20px;
    padding: 8px 16px;
    font-size: 16px;
    cursor: pointer;
}

/* 黑暗模式樣式 */
.dark-mode {
    background-color: #121212;
    color: #F0F0F0;
}

.dark-mode .topnav {
    background-color: #222222;
}

.dark-mode .topnav a {
    color: #F0F0F0;
}

.dark-mode .topnav a:hover {
    background-color: #555555;
    color: #ffffff;
}

.dark-mode .topnav a.active {
    background-color: #5A67D8;
    color: white;
}

.dark-mode button {
    background-color: #5A67D8;
    color: #FFFFFF;
}

.dark-mode button:hover {
    opacity: 0.8;
}

.dark-mode .copyBtn {
    background-color: #374151;
    color: #E5E7EB;
}

.dark-mode h2 {
    color: #F0F0F0;
}

/* 為頂部導航添加黑色背景色 */
.topnav {
    background-color: #333;
    overflow: hidden;
}

/* 設定導覽列中連結的樣式 */
.topnav a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}

/* 更改懸停時連結的顏色 */
.topnav a:hover {
    background-color: #ddd;
    color: black;
}

/* 新增一個活動類別來突出顯示目前頁面 */
.topnav a.active {
    background-color: #04AA6D;
    color: white;
}

/* 隱藏應在小屏幕上打開和關閉頂部導航的鏈接 */
.topnav .icon {
    display: none;
}

@media screen and (max-width: 600px) {
    .topnav a:not(:first-child) { display: none; }
    .topnav a.icon {
        float: right;
        display: block;
    }
}

@media screen and (max-width: 600px) {
    .topnav.responsive { position: relative; }
    .topnav.responsive .icon {
        position: absolute;
        right: 0;
        top: 0;
    }
    .topnav.responsive a {
        float: none;
        display: block;
        text-align: left;
    }
}

button {
    background-color: #04AA6D;
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    width: 50%;
    font-size: 16px;
}

button:hover {
    opacity: 0.8;
}

footer {
    background-color: #222;
    font-size: 14px;
    color: white;
    text-align: center;
    padding: 5px;
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
}

#date5 {
    position: fixed;
    top: 50px;
    right: 5px;
    font-size: 1.2rem;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

@media (max-width: 600px) {
    #date5 {
        top: 50px;
        font-size: 0.8rem;
    }
}

#clock5 {
    position: fixed;
    top: 85px;
    right: 5px;
    font-size: 1.2rem;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

@media (max-width: 600px) {
    #clock5 {
        top: 75px;
        font-size: 0.8rem;
    }
}

h2 {
    text-align: center;
    color: #333;
}

.mobile-content {
    display: none;
}

@media (max-width: 600px) {
    .desktop-content { display: none; }
    .mobile-content { display: block; }
}

.toggle-container {
    position: fixed;
    top: 120px;
    right: 15px;
    display: inline-block;
    width: 60px;
    height: 34px;
    cursor: pointer;
}

@media (max-width: 600px) {
    .toggle-container { top: 100px; }
}

.toggle-container input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: background-color 0.4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: #fff;
    transition: transform 0.4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #4d4d4d;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider .icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    fill: #f39c12;
    transition: opacity 0.4s;
}

.slider .icon.sun {
    left: 6px;
    opacity: 1;
}

input:checked + .slider .icon.sun {
    opacity: 0;
}

.slider .icon.moon {
    right: 6px;
    opacity: 0;
    fill: #f1c40f;
}

input:checked + .slider .icon.moon {
    opacity: 1;
}

/* 河內塔遊戲專用 CSS */
.container .towers {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 2rem 0;
}

#game .tower {
    background: linear-gradient(to bottom, #EEE 60%, var(--primary) 100%);
    height: 300px;
    border-radius: 8px 8px 0 0;
    position: relative;
    box-shadow: inset 0 -10px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    overflow: visible; /* 確保移動的圓盤不會被裁剪 */
}

#game .disk {
    height: 20px;
    background: linear-gradient(145deg, var(--primary), #038858);
    margin: 4px auto;
    border-radius: 8px;
    text-align: center;
    color: white;
    font-weight: bold;
    cursor: grab; /* PC 端 */
    touch-action: none; /* 禁用手機端默認觸碰行為 */
    position: relative; /* 預設相對定位，觸碰時切換為絕對定位 */
    z-index: 10; /* 確保移動時在最上層 */
    transition: opacity 0.3s; /* 平滑透明度變化 */
}

#game .disk:hover {
    transform: scale(1.05);
}

#game .tower-label {
    position: absolute;
    bottom: -30px;
    font-size: 1.2rem;
    font-weight: bold;
}

#towerA .tower-label::after { content: 'A'; }
#towerB .tower-label::after { content: 'B'; }
#towerC .tower-label::after { content: 'C'; }

#game #feedback {
    min-height: 2rem;
    opacity: 0;
    transition: opacity 0.5s ease;
}

#game #feedback.show {
    opacity: 1;
}

/* 詳細評分區域樣式 */
#scoreDetails {
    background: rgba(0, 0, 0, 0.05);
    padding: 10px;
    border-radius: 5px;
    text-align: left;
}

/* 遊戲卡片 */
.card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    margin: 1rem auto;
    max-width: 800px;
    padding: 2rem;
    transition: var(--transition);
}

/* 按鈕樣式 */
.btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
}

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

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

/* 響應式設計 */
@media (max-width: 768px) {
    .towers {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .tower {
        height: 200px;
    }
    
    .btn {
        width: 100%;
        margin: 8px 0;
    }
}

@media (max-width: 480px) {
    .card {
        padding: 1rem;
        margin: 0.5rem;
    }
    
    .game-title {
        font-size: 1.5rem;
    }
}

/* 暗黑模式調整 */
.dark-mode #game .tower {
    background: linear-gradient(to bottom, #444 60%, var(--secondary) 100%);
}

.dark-mode #game .disk {
    background: linear-gradient(145deg, var(--secondary), #4C51BF);
}

.dark-mode .card {
    background: rgba(32, 32, 32, 0.95);
    box-shadow: 0 8px 32px rgba(255, 255, 255, 0.05);
}

.dark-mode #scoreDetails {
    background: rgba(255, 255, 255, 0.05);
}

.dark-mode .topnav {
    background: #222;
    border-bottom: 1px solid #333;
}

.dark-mode .topnav a {
    color: var(--text-light);
}

.dark-mode .topnav a:hover {
    background: #333;
}

.dark-mode footer {
    background: #1A1A1A;
    border-top: 1px solid #333;
}

/* 暫停畫面樣式 */
#pauseOverlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(128, 128, 128, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.pause-overlay-content {
    background: var(--card-bg, rgba(255, 255, 255, 0.95));
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.dark-mode .pause-overlay-content {
    background: var(--card-bg, rgba(32, 32, 32, 0.95));
    box-shadow: 0 8px 32px rgba(255, 255, 255, 0.05);
}

/* 暫停時禁用其他按鈕 */
body.paused #gameControls .btn:not(#resumeButton) {
    pointer-events: none;
}

/* 暫停時畫面變灰 */
body.paused {
    filter: grayscale(100%);
}

.record-body {
    text-align: left;
    margin: 1rem 0;
}

.record-body ul {
    list-style: none;
    padding: 0;
}

.record-body li {
    margin: 1rem 0;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 8px;
}

.dark-mode .record-body li {
    background: rgba(255, 255, 255, 0.05);
}

.record-body hr {
    border: 0;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    margin: 0.5rem 0;
}

.dark-mode .record-body hr {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 增加觸碰區域響應 */
#game .tower {
    position: relative; /* 確保相對定位 */
    touch-action: none; /* 禁用默認觸碰行為 */
}

#game .disk {
    transition: transform 0.1s ease; /* 平滑移動效果 */
}

/* 觸碰時的高亮效果 */
#game .tower.drop-target {
    box-shadow: inset 0 0 15px rgba(4, 170, 109, 0.3);
}

/* 手機端優化 */
@media (max-width: 600px) {
    #game .tower {
        height: 45vh; /* 根據視窗高度自動調整 */
        min-height: 250px;
    }
    
    #game .disk {
        height: 25px; /* 加大觸碰區域 */
        margin: 6px auto;
    }
}