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

:root {
    --game-scale: 3;
}

body {
    background: #0a0a1a;
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
    overflow: auto;
    position: relative;
    padding: 16px;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(220, 24, 32, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(32, 56, 236, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, rgba(252, 160, 68, 0.05) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

#game-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    z-index: 1;
    position: relative;
    margin: auto;
    width: min(100%, 768px);
}

#gameCanvas {
    display: block;
    width: calc(256px * var(--game-scale));
    height: calc(240px * var(--game-scale));
    max-width: 100%;
    aspect-ratio: 256 / 240;
    border: 4px solid #2a2a4a;
    border-radius: 4px;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    box-shadow:
        0 0 30px rgba(220, 24, 32, 0.15),
        0 0 60px rgba(32, 56, 236, 0.1),
        0 4px 20px rgba(0, 0, 0, 0.5),
        inset 0 0 20px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    transition: box-shadow 0.3s ease;
}

#gameCanvas:hover {
    box-shadow:
        0 0 40px rgba(220, 24, 32, 0.2),
        0 0 80px rgba(32, 56, 236, 0.15),
        0 4px 25px rgba(0, 0, 0, 0.6),
        inset 0 0 20px rgba(0, 0, 0, 0.3);
}

#instructions {
    color: #8888bb;
    font-size: 12px;
    text-align: center;
    line-height: 1.65;
    letter-spacing: 0;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    width: 100%;
}

#instructions strong {
    color: #bbbbee;
    font-size: 13px;
}

.instructions-title {
    margin-bottom: 8px;
    font-size: 13px;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px 16px;
    margin: 6px 0;
}

.control-item {
    display: flex;
    align-items: center;
    gap: 3px;
    font-size: 11px;
    color: #606090;
    white-space: nowrap;
}

.key {
    display: inline-block;
    background: linear-gradient(180deg, #3a3a5a 0%, #2a2a44 100%);
    color: #ccccee;
    padding: 2px 5px;
    border-radius: 3px;
    border: 1px solid #4a4a6a;
    border-bottom: 2px solid #1a1a30;
    font-size: 10px;
    font-family: Consolas, "Courier New", monospace;
    min-width: 16px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.desc {
    color: #7777aa;
    margin-left: 4px;
}

.start-hint {
    margin-top: 8px;
    color: #555580;
    font-size: 11px;
    animation: blink-hint 2s ease-in-out infinite;
}

@keyframes blink-hint {

    0%,
    100% {
        opacity: 0.6;
    }

    50% {
        opacity: 1;
    }
}

@media (max-width: 800px) {
    :root {
        --game-scale: 2;
    }

    body {
        padding: 10px;
    }

    #game-wrapper {
        gap: 10px;
    }

    #instructions {
        font-size: 11px;
        padding: 6px 12px;
    }

    .controls-grid {
        grid-template-columns: 1fr;
        gap: 5px;
    }

    .control-item {
        justify-content: center;
        flex-wrap: wrap;
        white-space: normal;
    }
}

@media (max-height: 860px) {
    :root {
        --game-scale: 2;
    }
}

@media (max-width: 540px) {
    :root {
        --game-scale: 1;
    }
}