:root {
    --gold: #D4AF37;
    --glass: rgba(255, 255, 255, 0.08);
    --border: rgba(255, 255, 255, 0.15);
}

html { scroll-behavior: smooth; }
body {
    margin: 0;
    padding: 0;
    background-color: var(--space-black, #050505);
    color: white;
    font-family: "PingFang TC", "Microsoft JhengHei", sans-serif;
    overflow-x: hidden;
    display: block; /* 🌟 加上這行，強制所有大區塊乖乖上下排列 */
}

.space-bg {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(135deg, #050505 0%, #1a1a1a 50%, #2c5364 100%);
    z-index: -1;
}

.glass-card { background: var(--glass); backdrop-filter: blur(20px); border: 1px solid var(--border); border-radius: 30px; }

.fixed-nav { position: fixed; top: 0; width: 100%; z-index: 100; background: rgba(0,0,0,0.3); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.nav-content { max-width: 1100px; margin: 0 auto; padding: 12px 20px; display: flex; justify-content: space-between; align-items: center; }

/* 首頁區塊 */
.hero { 
    min-height: 100vh; 
    width: 100%; /* 🌟 加上這行 */
    display: flex; 
    justify-content: center; 
    align-items: center; 
}

/* 下方介紹區塊 */

.central-ui { padding: 40px; text-align: center; width: 350px; }
.glitter-text { font-size: 3.5rem; background: linear-gradient(to bottom, #fff, var(--gold)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin: 0; }

.lv-group { display: flex; gap: 8px; justify-content: center; margin: 15px 0; }
.lv-btn { width: 38px; height: 38px; background: none; border: 1px solid var(--gold); color: var(--gold); border-radius: 8px; cursor: pointer; }
.lv-btn.active { background: var(--gold); color: black; box-shadow: 0 0 15px var(--gold); }

.btn-start { margin-top: 20px; padding: 12px 50px; font-size: 1.1rem; background: linear-gradient(45deg, var(--gold), #FFD700); border: none; border-radius: 50px; font-weight: bold; cursor: pointer; }

/* 棋盤佈局 */
.game-layout { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.ctrl-middle { display: flex; align-items: center; gap: 10px; }
.board { 
    display: grid; grid-template-columns: repeat(6, 52px); 
    grid-template-rows: repeat(6, 52px); gap: 6px; 
    padding: 12px; background: rgba(255,255,255,0.05); border-radius: 18px;
    border: 1px solid var(--border);
}

/* 按鈕改為外側方向 */
.ctrl-btn { 
    background: var(--glass); border: 1px solid var(--border); color: var(--gold); 
    cursor: pointer; border-radius: 6px; font-size: 16px; transition: 0.2s;
}
.ctrl-btn:hover { background: var(--gold); color: black; }

/* 這裡確保按鈕位置對齊中間兩行/列 */
.ctrl-row { display: flex; gap: 6px; width: 342px; justify-content: center; }
.ctrl-row button { width: 52px; height: 30px; }
.ctrl-col { display: flex; flex-direction: column; gap: 6px; height: 342px; justify-content: center; }
.ctrl-col button { width: 30px; height: 52px; }

/* 顏色定義：綠色改為白色 */
.c-0 { background: #333; } /* 固定灰 */
.c-1 { background: #e67e22; box-shadow: 0 0 12px #e67e22; } /* 橙 */
.c-2 { background: #ffffff; box-shadow: 0 0 12px #ffffff; } /* 白色 (原綠) */
.c-3 { background: #3498db; box-shadow: 0 0 12px #3498db; } /* 藍 */
.c-4 { background: #f1c40f; box-shadow: 0 0 12px #f1c40f; } /* 黃 */

/* 下方介紹區 */
.intro-footer {
    min-height: 100vh; 
    width: 100%; /* 🌟 加上這行 */
    display: flex; 
    justify-content: center; 
    align-items: center; 
    padding: 40px 20px; 
    box-sizing: border-box;
}
.intro-content { max-width: 600px; width: 90%; padding: 40px; text-align: center; }
.gold-line { width: 50px; height: 3px; background: var(--gold); margin: 20px auto; }
.features { display: inline-block; text-align: left; list-style: none; padding: 0; line-height: 2.2; }
.features span { color: var(--gold); margin-right: 10px; }
.btn-outline { background: none; border: 1px solid var(--gold); color: var(--gold); padding: 8px 20px; border-radius: 8px; cursor: pointer; margin-top: 20px; }
.game-info { margin-top: 15px; display: flex; gap: 25px; align-items: center; }

/* 確保棋盤大小合適 */
.board {
    display: grid;
    grid-template-columns: repeat(6, 50px);
    grid-template-rows: repeat(6, 50px);
    gap: 8px;
    justify-content: center;
}

/* 格子基礎設定：加入 flex 讓箭頭文字可以置中 */
/* 格子基礎設定 */
.cell {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    position: relative; /* 為了讓箭頭絕對定位 */
    transition: 0.3s ease;
}

/* 可以點擊的邊緣彩色塊 */
.cell.clickable {
    cursor: pointer;
}

.cell.clickable:hover {
    filter: brightness(1.2);
    transform: scale(1.05);
}

/* --- 把箭頭懸浮在棋盤外面的魔術 --- */
.cell.clickable::after {
    position: absolute;
    color: #888; /* 箭頭顏色 */
    font-size: 18px;
    font-weight: bold;
    pointer-events: none; /* 避免擋住點擊 */
    transition: 0.3s;
}

.cell.clickable:hover::after { color: var(--gold); }

/* 設定各方向箭頭的位置 (推到格子外面) */
.cell.arrow-up::after { content: '↑'; top: -30px; left: 50%; transform: translateX(-50%); }
.cell.arrow-down::after { content: '↓'; bottom: -30px; left: 50%; transform: translateX(-50%); }
.cell.arrow-left::after { content: '←'; left: -30px; top: 50%; transform: translateY(-50%); }
.cell.arrow-right::after { content: '→'; right: -30px; top: 50%; transform: translateY(-50%); }

/* 顏色定義 (參考你的截圖完美還原) */
.c-0 { background: #444; } /* 固定的深灰色角塊 */
.c-1 { background: #e74c3c; box-shadow: 0 0 10px rgba(231,76,60,0.5); } /* 紅色 */
.c-2 { background: #e67e22; box-shadow: 0 0 10px rgba(230,126,34,0.5); } /* 橙色 */
.c-3 { background: #f1c40f; box-shadow: 0 0 10px rgba(241,196,15,0.5); } /* 黃色 */
.c-4 { background: #3498db; box-shadow: 0 0 10px rgba(52,152,219,0.5); } /* 藍色 */
.c-5 { background: #ffffff; box-shadow: 0 0 10px rgba(255,255,255,0.5); } /* 白色 */


.btn-nav {
    background: none;
    border: 1px solid var(--gold);
    color: var(--gold);
    padding: 8px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.2s;
}

.game-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 50;
    border-radius: 30px;
}

.countdown-text {
    font-size: 8rem;
    color: var(--gold);
    font-weight: bold;
    text-shadow: 0 0 30px var(--gold);
    animation: pop 1s ease-in-out infinite;
}

/* 倒數跳動動畫 */
@keyframes pop {
    0% { transform: scale(0.5); opacity: 0; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); opacity: 0; }
}

/* 過關時棋盤的發光效果 */
.board.win-glow {
    box-shadow: 0 0 50px rgba(212, 175, 55, 0.6);
    border: 1px solid var(--gold);
    transition: 0.8s ease;
}