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

:root {
    --bg: #0a1628;
    --bg-surface: #111f38;
    --bg-surface-hover: #172b4a;
    --text: #e4eaf4;
    --text-dim: #7e92b0;
    --accent: #00c9a7;
    --accent-light: #33f4d1;
    --accent-glow: rgba(0, 201, 167, 0.25);
    --gold: #ffc857;
    --danger: #ff5e5e;
    --danger-glow: rgba(255, 94, 94, 0.2);
    --radius: 14px;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    -webkit-tap-highlight-color: transparent;
    -webkit-user-select: none;
    user-select: none;
    touch-action: none;
}

/* ── Screens ── */
.screen {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10;
    background: var(--bg);
}

.screen.active {
    display: flex;
}

.screen-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    padding: 24px;
    animation: fadeUp 0.5s ease both;
}

/* ── Start Screen ── */
.game-title {
    font-size: clamp(42px, 10vw, 64px);
    font-weight: 800;
    line-height: 1.05;
    text-align: center;
    letter-spacing: -1px;
    color: var(--text);
}

.game-title span {
    color: var(--accent);
    display: inline-block;
}

.best-score-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    background: var(--bg-surface);
    padding: 14px 44px;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.best-score-box .label,
.score-line .label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-dim);
}

.best-score-box .value {
    font-size: 34px;
    font-weight: 700;
    color: var(--gold);
    line-height: 1.2;
}

/* ── Buttons ── */
.btn {
    border: none;
    outline: none;
    cursor: pointer;
    font-family: var(--font);
    font-weight: 600;
    border-radius: var(--radius);
    transition: transform 0.12s, background 0.15s, box-shadow 0.15s;
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    padding: 16px 72px;
    font-size: 20px;
    color: var(--bg);
    background: var(--accent);
    box-shadow: 0 4px 20px var(--accent-glow), 0 0 0 0 var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-light);
    box-shadow: 0 6px 30px var(--accent-glow);
}

.btn-secondary {
    padding: 10px 24px;
    font-size: 14px;
    color: var(--text-dim);
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.btn-secondary:hover {
    background: var(--bg-surface-hover);
    color: var(--text);
}

/* ── Game HUD ── */
.game-hud {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 16px;
    background: rgba(10, 22, 40, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.hud-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 60px;
}

.hud-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-dim);
}

.hud-value {
    font-size: 22px;
    font-weight: 700;
    line-height: 1.2;
}

.hud-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-dim);
    font-size: 18px;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s, opacity 0.15s;
}

.hud-btn:hover {
    background: var(--bg-surface);
    color: var(--text);
}

.hud-btn.muted {
    opacity: 0.4;
}

/* ── Canvas ── */
#game-canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
}

/* ── Shooter tray ── */
.shooter-tray {
    position: fixed;
    bottom: 12px;
    left: 12px;
    z-index: 20;
    display: flex;
    align-items: center;
}

.next-preview {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(10, 22, 40, 0.85);
    padding: 6px 12px 6px 10px;
    border-radius: 10px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.next-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
}

/* ── Game Over ── */
.gameover-title {
    font-size: clamp(36px, 9vw, 52px);
    font-weight: 800;
    color: var(--danger);
    text-shadow: 0 4px 24px var(--danger-glow);
}

.score-card {
    background: var(--bg-surface);
    padding: 20px 44px;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
    min-width: 220px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.score-line {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 28px;
}

.score-line .value {
    font-size: 26px;
    font-weight: 700;
}

.score-line .value.highlight {
    color: var(--gold);
}

.divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.06);
}

.new-best {
    font-size: 15px;
    font-weight: 700;
    color: var(--gold);
    text-transform: uppercase;
    letter-spacing: 2px;
    animation: pulse 1s ease infinite alternate;
}

/* ── Decorative background bubbles (start screen) ── */
.logo-bubbles {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: -1;
}

.logo-bubble {
    position: absolute;
    border-radius: 50%;
    opacity: 0.08;
    animation: floatUp linear infinite;
}

/* ── Animations ── */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    from {
        opacity: 0.7;
        transform: scale(1);
    }

    to {
        opacity: 1;
        transform: scale(1.06);
    }
}

@keyframes floatUp {
    0% {
        transform: translateY(100vh) scale(0.5);
        opacity: 0;
    }

    10% {
        opacity: 0.08;
    }

    90% {
        opacity: 0.08;
    }

    100% {
        transform: translateY(-10vh) scale(1);
        opacity: 0;
    }
}

/* ── Responsive ── */
@media (max-width: 480px) {
    .btn-primary {
        padding: 14px 56px;
        font-size: 18px;
    }

    .best-score-box {
        padding: 12px 32px;
    }

    .best-score-box .value {
        font-size: 28px;
    }

    .score-card {
        padding: 16px 28px;
        min-width: 200px;
    }

    .score-line .value {
        font-size: 22px;
    }
}