:root {
    --bg-deep: #050a06;
    --accent-a: #8bff4d;
    --accent-b: #4dff9d;
    --accent-c: #ffd93d;
    --accent-gradient: linear-gradient(135deg, var(--accent-a), var(--accent-b) 55%, var(--accent-c));
    --text-main: #eafff0;
    --text-dim: rgba(234, 255, 240, 0.65);
    --card-bg: rgba(139, 255, 77, 0.08);
    --card-border: rgba(139, 255, 77, 0.22);
}

* {
    box-sizing: border-box;
}

body {
    background: var(--bg-deep);
    color: var(--text-main);
    margin: 0;
    min-height: 100vh;
    font-family: 'Poppins', 'Comic Sans', cursive;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.bg-glow {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(45rem 45rem at 15% 10%, rgba(139, 255, 77, 0.18), transparent 60%),
        radial-gradient(35rem 35rem at 90% 15%, rgba(255, 217, 61, 0.16), transparent 60%),
        linear-gradient(180deg, rgba(5, 10, 6, 0.9), rgba(5, 10, 6, 0.98));
}

.back-link {
    position: fixed;
    top: 1.25rem;
    left: 1.25rem;
    z-index: 2;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    background: rgba(139, 255, 77, 0.06);
    border: 1px solid var(--card-border);
    padding: 0.5rem 1rem;
    border-radius: 0.75rem;
    backdrop-filter: blur(10px);
    transition: color 0.2s ease, border-color 0.2s ease;
}

.back-link:hover {
    color: var(--text-main);
    border-color: rgba(255, 255, 255, 0.3);
}

.game-shell {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.hud-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
}

.hud-chip {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.75rem;
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.hud-chip span {
    color: var(--accent-c);
}

.canvas-wrap {
    position: relative;
    width: min(90vw, calc(78vh * 0.6429), 500px);
    aspect-ratio: 360 / 560;
    border-radius: 1.25rem;
    overflow: hidden;
    box-shadow: 0 25px 60px -25px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.14);
    cursor: crosshair;
    touch-action: none;
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none;
}

.overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(5, 10, 6, 0.8);
    backdrop-filter: blur(4px);
}

.overlay[hidden] {
    display: none;
}

.overlay__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1.5rem;
    gap: 0.6rem;
}

.overlay__title {
    font-size: 1.4rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.overlay__desc {
    color: var(--text-dim);
    font-size: 0.9rem;
    max-width: 16rem;
}

.overlay__btn {
    margin-top: 0.5rem;
    background: var(--accent-gradient);
    color: #062109;
    border: none;
    font-family: inherit;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.65rem 1.8rem;
    border-radius: 0.85rem;
    cursor: pointer;
}