:root {
    --bg: #050a14;
    --surface: rgba(255, 255, 255, 0.04);
    --border: rgba(100, 160, 255, 0.12);
    --accent: #4d9fff;
    --accent2: #a855f7;
    --text: #e2eaf8;
    --text-dim: rgba(226, 234, 248, 0.4);
    --glow: rgba(77, 159, 255, 0.3);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* ── Background ── */
.bg-animation {
    position: fixed;
    inset: 0;
    z-index: 0;
    background:
        radial-gradient(ellipse 60% 50% at 20% 20%, rgba(77, 159, 255, 0.07) 0%, transparent 60%),
        radial-gradient(ellipse 50% 60% at 80% 80%, rgba(168, 85, 247, 0.07) 0%, transparent 60%);
    animation: bgPulse 8s ease-in-out infinite alternate;
}
@keyframes bgPulse {
    from { opacity: 0.6; }
    to   { opacity: 1; }
}

/* ── Back Button ── */
.back-btn {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    z-index: 100;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    font-weight: 600;
    transition: color 0.3s;
}
.back-btn:hover { color: var(--accent); }

/* ── Layout ── */
.game-wrapper {
    position: relative;
    z-index: 1;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    padding: 1rem;
}

/* ── Glass Card ── */
.glass-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    backdrop-filter: blur(12px);
}

/* ── Side Panels ── */
.side-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 160px;
}

.info-card {
    padding: 1.2rem 1rem;
    text-align: center;
}

.label {
    font-size: 0.6rem;
    letter-spacing: 0.25em;
    color: var(--text-dim);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.value {
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent);
    letter-spacing: -0.02em;
    min-height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lives-display {
    gap: 6px;
    font-size: 1.1rem;
}

.life {
    color: #4d9fff;
    transition: color 0.3s, opacity 0.3s;
}
.life.dead {
    color: #333;
    opacity: 0.3;
}

/* ── Controls ── */
.controls-card {
    padding: 1.2rem 1rem;
}

.controls-list {
    list-style: none;
    margin-top: 0.6rem;
}

.controls-list li {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    margin-bottom: 0.7rem;
    font-size: 0.7rem;
    color: var(--text-dim);
}

.key {
    display: inline-block;
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 2px 8px;
    font-size: 0.65rem;
    color: var(--accent);
    font-weight: 700;
    letter-spacing: 0.05em;
}

/* ── Dev Card ── */
.dev-card {
    padding: 1.2rem 1rem;
}

.dev-note {
    font-size: 0.65rem;
    color: var(--text-dim);
    line-height: 1.6;
    margin-top: 0.5rem;
}

/* ── Canvas Wrapper ── */
.canvas-wrapper {
    position: relative;
    padding: 4px;
    border-radius: 20px;
    overflow: hidden;
    box-shadow:
        0 0 0 1px var(--border),
        0 0 60px var(--glow),
        inset 0 0 30px rgba(0,0,0,0.5);
}

#gameCanvas {
    display: block;
    border-radius: 16px;
}

/* ── Overlays ── */
.overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(5, 10, 20, 0.88);
    backdrop-filter: blur(8px);
    border-radius: 16px;
    z-index: 10;
    transition: opacity 0.4s;
}

.overlay.hidden {
    display: none;
}

.overlay-content {
    text-align: center;
}

.overlay-sub {
    font-size: 0.65rem;
    letter-spacing: 0.4em;
    color: var(--text-dim);
    margin-bottom: 0.8rem;
    font-weight: 600;
}

.overlay-title {
    font-size: 4rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.glow-text {
    filter: drop-shadow(0 0 20px rgba(77, 159, 255, 0.6));
}

.glitch {
    position: relative;
}
.glitch::before,
.glitch::after {
    content: attr(data-text);
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.glitch::before {
    animation: glitchA 3s infinite;
    clip-path: polygon(0 30%, 100% 30%, 100% 50%, 0 50%);
}
.glitch::after {
    animation: glitchB 3s infinite;
    clip-path: polygon(0 60%, 100% 60%, 100% 80%, 0 80%);
}
@keyframes glitchA {
    0%, 90%, 100% { transform: translate(0); }
    93% { transform: translate(-3px, 1px); }
    96% { transform: translate(3px, -1px); }
}
@keyframes glitchB {
    0%, 90%, 100% { transform: translate(0); }
    93% { transform: translate(3px, 1px); }
    96% { transform: translate(-3px, -1px); }
}

.overlay-divider {
    width: 60px;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--accent), transparent);
    margin: 1.5rem auto;
}

.final-score {
    font-size: 1rem;
    letter-spacing: 0.2em;
    color: var(--text-dim);
    margin: 1rem 0 1.5rem;
}

.action-btn {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border: none;
    border-radius: 50px;
    padding: 0.8rem 2.5rem;
    color: white;
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 8px 30px rgba(77, 159, 255, 0.3);
}
.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(77, 159, 255, 0.5);
}
.action-btn:active {
    transform: translateY(0);
}