:root {
    --primary-blue: #0078d7; --secondary-blue: #63b3ed;
    --accent-yellow: #ffc700; --light-bg: #f0f8ff;
    --dark-text: #2c3e50; --white: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.15);
    --game-font: 'Press Start 2P', cursive;
}
body {
    background-color: var(--light-bg);
    background-image:
            linear-gradient(rgba(0, 120, 215, 0.07) 1px, transparent 1px),
            linear-gradient(90deg, rgba(0, 120, 215, 0.07) 1px, transparent 1px);
    background-size: 30px 30px;
    color: var(--dark-text);
    font-family: sans-serif;
    margin: 0;
    overflow: hidden;
}
.hidden { display: none !important; }
#name-entry-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}
#name-entry-container p {
    margin: 15px 0;
    font-size: 1.1rem;
    color: var(--dark-text);
}
.name-input-section {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    width: 100%;
}
#player-name-input {
    flex-grow: 1;
    padding: 12px;
    border: 2px solid var(--secondary-blue);
    border-radius: 8px;
    font-size: 1.1rem;
}
#submit-name-btn {
    padding: 10px 20px; border: none; background-color: var(--primary-blue);
    color: var(--white); font-family: var(--game-font); font-size: 0.8rem;
    border-radius: 8px; cursor: pointer; transition: background-color 0.2s;
}
#submit-name-btn:hover { background-color: #005a9e; }
#pre-game-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
}
.game-title { text-align: center; margin-bottom: 25px; }
.game-title h1 {
    font-family: var(--game-font); color: var(--primary-blue); font-size: 3rem; margin: 0;
    text-shadow: -3px -3px 0px var(--white), 3px -3px 0px var(--white), -3px 3px 0px var(--white), 3px 3px 0px var(--white), 6px 6px 0px var(--secondary-blue);
}
.game-title p {
    font-family: var(--game-font); color: var(--primary-blue); font-size: 1.1rem; margin: 10px 0 0 0; opacity: 0.85;
}
#lobby-container, #room-container {
    width: 100%; max-width: 600px; text-align: center;
}
.lobby-box, .room-box {
    background: var(--white); padding: 30px 40px; border-radius: 16px;
    box-shadow: 12px 12px 20px var(--shadow-color); border: 4px solid var(--primary-blue);
}
.lobby-box h1, .room-box h1 { font-family: var(--game-font); color: var(--primary-blue); margin-bottom: 30px; }
.lobby-box h2, .room-box h2 {
    font-family: var(--game-font); font-size: 1rem; color: var(--dark-text);
    border-bottom: 2px solid var(--secondary-blue); padding-bottom: 10px; margin-top: 40px;
}
.create-room-section { display: flex; gap: 10px; margin-bottom: 20px; }
#room-name-input {
    flex-grow: 1; padding: 10px; border: 2px solid var(--secondary-blue); border-radius: 8px; font-size: 1rem;
}
#create-room-btn, #start-game-btn, #leave-room-btn, .join-btn {
    padding: 10px 20px; border: none; background-color: var(--primary-blue);
    color: var(--white); font-family: var(--game-font); font-size: 0.8rem;
    border-radius: 8px; cursor: pointer; transition: background-color 0.2s;
}
#create-room-btn:hover, #start-game-btn:hover, #leave-room-btn:hover, .join-btn:hover { background-color: #005a9e; }
#start-game-btn { background-color: #1dd1a1; }
#start-game-btn:hover { background-color: #10ac84; }
#leave-room-btn { background-color: #ff6b6b; margin-top: 20px;}
#leave-room-btn:hover { background-color: #ee5253; }
#room-list, #player-list { list-style: none; padding: 0; margin-top: 20px; }
#room-list li, #player-list li {
    display: flex; justify-content: space-between; align-items: center;
    padding: 15px; background: var(--light-bg); border-radius: 8px; margin-bottom: 10px;
}
#player-list li { font-weight: bold; }
#player-list .host-tag {
    font-family: var(--game-font); font-size: 0.7rem; color: var(--accent-yellow);
    background-color: var(--primary-blue); padding: 3px 6px; border-radius: 4px; margin-left: 10px;
}
.main-layout {
    display: flex;
    width: 100vw;
    height: 100vh;
}
#info-panel {
    width: 20%;
    background-color: var(--secondary-blue);
    padding: 25px;
    box-sizing: border-box;
    color: var(--dark-text);
    box-shadow: 3px 0 10px rgba(0,0,0,0.1);
    z-index: 10;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}
#game-area {
    width: 80%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--light-bg);
}
#game-container {
    position: relative;
    border: 8px solid var(--white);
    border-radius: 16px;
    box-shadow: 0 0 0 4px var(--primary-blue), 12px 12px 20px var(--shadow-color);
    overflow: hidden;
    background-color: #000;
}
canvas { display: block; }
#game-over-screen {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 20, 50, 0.85); color: var(--white);
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    opacity: 0; visibility: hidden; transition: opacity 0.4s ease, visibility 0.4s ease;
    border-radius: 8px;
}
#game-over-screen.visible { opacity: 1; visibility: visible; }
#game-over-screen h2 {
    font-family: var(--game-font); font-size: 3.5rem; color: #ff4757;
    text-shadow: 5px 5px 0px #2c3e50; margin: 0;
}
#game-over-screen p {
    font-family: var(--game-font); font-size: 1.2rem; margin-top: 40px;
    background: var(--primary-blue); padding: 10px 20px; border-radius: 8px;
    border: 3px solid var(--white);
}
#info-panel h3 {
    font-family: var(--game-font); color: var(--white); font-size: 1.1rem;
    margin-top: 0; margin-bottom: 20px; border-bottom: 4px dotted rgba(255, 255, 255, 0.6);
    padding-bottom: 12px; text-shadow: 2px 2px 2px var(--primary-blue);
}
#info-panel h3:last-of-type { margin-top: 30px; }
.stats-list { list-style: none; padding: 0; }
.stats-list li { display: flex; align-items: center; margin-bottom: 18px; font-size: 1rem; font-weight: bold; }
.stats-list svg { width: 32px; height: 32px; margin-right: 15px; fill: var(--white); filter: drop-shadow(2px 2px 2px var(--primary-blue)); }
.stat-value {
    margin-left: auto; font-weight: bold; font-size: 1.3rem; background: var(--accent-yellow);
    color: var(--dark-text); padding: 5px 12px; border-radius: 8px;
    border: 3px solid var(--white); box-shadow: 2px 2px 0 var(--primary-blue);
}
.controls {
    margin-bottom: auto;
    /* text-align: center; <-- 删除这一行 */
}
kbd {
    background-color: #f5f6fa; color: #485460; border-radius: 6px; padding: 6px 10px;
    font-size: 0.9em; font-weight: bold; border: 2px solid #dcdde1;
    box-shadow: 3px 3px 0px #ced6e0; margin: 0 4px;
    display: block;
    margin: 8px 0 0 15px;
    width: fit-content;
}

.keys-layout-grid {
    display: grid;
    /* 定义3个列：左、中、右 */
    grid-template-columns: repeat(3, auto);
    /* 定义行间距 */
    row-gap: 12px;
    /* 定义列间距 */
    column-gap: 4px;
    /* 让所有按键在单元格内水平居中 */
    justify-items: center;
}

/* --- 定位每个元素 --- */

/* “移动:” 标签，放在第1行，第1列 */
#move-label,
#place-label{
    grid-row: 1;
    grid-column: 1;
    /* 垂直居中对齐 */
    align-self: center;
    /* 水平靠左对齐 */
    justify-self: start;
    font-weight: bold;
}
/* 方向键的布局 */
#key-up   { grid-row: 1; grid-column: 2; }
#key-left { grid-row: 2; grid-column: 1; }
#key-down { grid-row: 2; grid-column: 2; }
#key-right{ grid-row: 2; grid-column: 3; }

/* “放置:” 标签，放在第3行，第1列 */
#place-label {
    grid-row: 3;
    grid-column: 1;
    align-self: center;
    justify-self: start;
    /* 和 Space 键之间增加一点上边距 */
    margin-top: 10px;
}

/* Space 键，放在第4行，第2列，与下箭头对齐 */
#key-space {
    grid-row: 4;
    grid-column: 2;
}

footer { text-align: center; padding: 15px; font-size: 0.9rem; color: var(--dark-text); opacity: 0.8; }