:root {
    --font-display: 'Cabinet Grotesk', system-ui, sans-serif;
    --font-body: 'Satoshi', system-ui, sans-serif;
    --text-xs: clamp(0.75rem, 0.72rem + 0.2vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.84rem + 0.25vw, 1rem);
    --text-base: clamp(1rem, 0.96rem + 0.3vw, 1.125rem);
    --text-lg: clamp(1.25rem, 1.1rem + 0.8vw, 1.75rem);
    --text-xl: clamp(1.75rem, 1.2rem + 2vw, 3rem);
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --radius-md: 0.75rem;
    --radius-lg: 1.2rem;
    --color-bg: #050816;
    --color-surface: rgba(10, 16, 34, 0.72);
    --color-surface-2: rgba(24, 31, 63, 0.62);
    --color-border: rgba(154, 193, 255, 0.2);
    --color-text: #edf4ff;
    --color-text-muted: #9eb2d7;
    --color-primary: #67e8f9;
    --color-danger: #ff6b8b;
    --color-warning: #ffd166;
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.4);
    --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

html,
body {
    height: 100%;
}

body {
    overflow: hidden;
    font-family: var(--font-body);
    background:
        radial-gradient(circle at 20% 20%, rgba(84, 135, 255, 0.14), transparent 22%),
        radial-gradient(circle at 80% 18%, rgba(103, 232, 249, 0.12), transparent 18%),
        radial-gradient(circle at 65% 72%, rgba(255, 144, 106, 0.16), transparent 20%),
        linear-gradient(180deg, #02030a 0%, #050816 30%, #060c1d 100%);
    color: var(--color-text);
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
}

button {
    font: inherit;
    color: inherit;
    border: 1px solid rgba(255, 255, 255, 0.16);
    background: rgba(255, 255, 255, 0.06);
    border-radius: 999px;
    padding: 0.8rem 1.3rem;
    cursor: pointer;
    transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

button:hover,
button:focus-visible {
    transform: translateY(-2px);
    background: rgba(103, 232, 249, 0.14);
    border-color: rgba(103, 232, 249, 0.38);
    outline: none;
}

#gameCanvas {
    width: 100vw;
    height: 100vh;
    display: block;
    touch-action: none;
}

.hud {
    position: fixed;
    inset: 0;
    pointer-events: none;
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.hud-top,
.hud-bottom {
    display: flex;
    justify-content: space-between;
    gap: var(--space-4);
    align-items: flex-start;
}

.panel {
    pointer-events: auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(14px);
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-4);
}

.stats {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.stat {
    min-width: 110px;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.label {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-muted);
}

.value {
    margin-top: 0.25rem;
    font-size: var(--text-base);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.controls {
    max-width: 360px;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    line-height: 1.55;
}

.overlay {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    padding: var(--space-4);
    background: linear-gradient(180deg, rgba(4, 7, 18, 0.18), rgba(4, 7, 18, 0.68));
}

.card {
    width: min(680px, 100%);
    padding: clamp(1.4rem, 3vw, 2.5rem);
    border-radius: 1.6rem;
    border: 1px solid var(--color-border);
    background:
        linear-gradient(180deg, rgba(18, 26, 52, 0.88), rgba(8, 12, 25, 0.9)),
        radial-gradient(circle at top, rgba(103, 232, 249, 0.16), transparent 38%);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(18px);
}

.eyebrow {
    color: var(--color-primary);
    font-size: var(--text-xs);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    margin-bottom: var(--space-3);
}

h1,
h2 {
    font-family: var(--font-display);
    line-height: 0.95;
    letter-spacing: -0.04em;
}

h1 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

h2 {
    font-size: clamp(1.6rem, 4vw, 2.5rem);
    margin-bottom: var(--space-4);
}

.lead {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    max-width: 52ch;
    margin-bottom: var(--space-6);
    line-height: 1.7;
}

.actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    pointer-events: auto;
}

.primary {
    background: rgba(103, 232, 249, 0.14);
    border-color: rgba(103, 232, 249, 0.4);
}

.game-over {
    display: none;
}

.game-over.show {
    display: grid;
}

.hidden {
    display: none !important;
}

.control-guide {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-4);
    margin-bottom: var(--space-6);
    line-height: 1.5;
}

.control-guide strong {
    color: var(--color-primary);
}

.desktop-only {
    display: inline;
}

.mobile-only {
    display: none;
}

@media (max-width: 700px) {
    .desktop-only {
        display: none;
    }

    .mobile-only {
        display: inline;
    }

    .hud {
        padding: 0.5rem;
    }
    
    .hud-top {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        gap: 0.5rem;
    }

    .stats.panel {
        display: flex;
        flex-direction: row;
        flex-wrap: nowrap;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        padding: 0.4rem 0.6rem;
        border-radius: var(--radius-md);
        gap: 0.4rem;
        background: var(--color-surface);
    }

    .stat {
        min-width: 0;
        flex: 1;
        padding: 0.25rem 0.4rem;
        text-align: center;
        border-radius: 0.4rem;
        border: 1px solid rgba(255, 255, 255, 0.05);
    }
    
    .stat .label {
        font-size: 0.65rem;
        letter-spacing: 0.05em;
    }
    
    .stat .value {
        font-size: 0.85rem;
        margin-top: 0.1rem;
    }

    .controls {
        display: none !important;
    }

    .hud-bottom {
        display: none !important;
    }

    .actions button {
        width: 100%;
        justify-content: center;
    }
}