:root {
    --bg: #071018;
    --panel: #0f1d2b;
    --panel-2: #16283a;
    --text: #eef6ff;
    --muted: #a8b8c9;
    --line: rgba(255, 255, 255, 0.1);
    --accent: #73a7ff;
    --accent-2: #54d18f;
    --warning: #ffcd56;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background:
        radial-gradient(circle at top, rgba(115, 167, 255, 0.16), transparent 30%),
        linear-gradient(180deg, #06101a 0%, #091520 100%);
    color: var(--text);
    min-height: 100vh;
}

.page {
    display: flex;
    justify-content: center;
    padding: 28px;
}

.panel {
    width: min(1120px, 100%);
    background: rgba(15, 29, 43, 0.94);
    border: 1px solid var(--line);
    border-radius: 28px;
    box-shadow: var(--shadow);
    padding: 28px;
    backdrop-filter: blur(10px);
}

.panel__header {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 24px;
}

.eyebrow {
    margin: 0 0 8px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 12px;
    color: var(--warning);
}

h1,
h2 {
    margin-top: 0;
}

h1 {
    margin-bottom: 10px;
    font-size: clamp(28px, 4vw, 42px);
}

.lead {
    margin: 0;
    color: var(--muted);
    max-width: 760px;
    line-height: 1.6;
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    appearance: none;
    border: 1px solid var(--line);
    background: var(--panel-2);
    color: var(--text);
    padding: 12px 18px;
    border-radius: 14px;
    font-size: 15px;
    cursor: pointer;
    transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.btn:hover {
    transform: translateY(-1px);
    border-color: rgba(255, 255, 255, 0.24);
}

.btn--primary {
    background: linear-gradient(135deg, #467cf0, #73a7ff);
    color: #07101c;
    border-color: transparent;
    font-weight: 700;
}

.hud {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 22px;
}

.hud__card {
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 16px;
}

.hud__label {
    display: block;
    color: var(--muted);
    font-size: 13px;
    margin-bottom: 6px;
}

.hud__card strong {
    font-size: 24px;
}

.game-wrap {
    position: relative;
    width: fit-content;
    max-width: 100%;
    margin: 0 auto 24px;
    border-radius: 22px;
    overflow: hidden;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

canvas {
    display: block;
    background: #02070d;
    max-width: 100%;
    height: auto;
}

.overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.55);
}

.overlay.hidden {
    display: none;
}

.overlay__box {
    background: rgba(6, 14, 22, 0.92);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 26px;
    text-align: center;
}

.controls,
.explanation {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 20px;
}

.controls {
    margin-bottom: 18px;
}

.controls ul {
    margin: 0;
    padding-left: 18px;
    line-height: 1.7;
    color: var(--muted);
}

.explanation p {
    color: var(--muted);
    line-height: 1.7;
    margin-bottom: 0;
}

.explanation p + p {
    margin-top: 14px;
}

@media (max-width: 860px) {
    .panel__header {
        flex-direction: column;
    }

    .hud {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .page {
        padding: 14px;
    }

    .panel {
        padding: 16px;
        border-radius: 22px;
    }

    .hud {
        grid-template-columns: 1fr;
    }
}