:root {
    --bg-dark: #0f172a;
    --primary: #ef4444; /* Mario Red */
    --primary-hover: #dc2626;
    --text-main: #f8fafc;
    --text-muted: #cbd5e1;
    --glass-bg: rgba(15, 23, 42, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    background: radial-gradient(circle at center, #1e293b 0%, var(--bg-dark) 100%);
    font-family: 'Press Start 2P', cursive;
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    padding: 2rem;
    border-radius: 2rem;
    background: rgba(255, 255, 255, 0.03);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.game-wrapper {
    position: relative;
    width: 800px;
    height: 600px;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

canvas {
    display: block;
    background: #5c94fc; /* Classic SMB Sky blue */
    image-rendering: pixelated;
}

.ui-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 10;
    transition: opacity 0.3s ease;
}

.ui-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 3rem 4rem;
    border-radius: 1.5rem;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    transform: translateY(0);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

.game-title {
    font-size: 2rem;
    font-weight: 400;
    line-height: 1.5;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.game-title.text-danger {
    background: linear-gradient(135deg, #ef4444 0%, #fca5a5 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.primary-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 0.8rem;
    font-weight: 400;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.4);
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.6);
}

.primary-btn:active {
    transform: translateY(1px);
}

.hud {
    position: absolute;
    top: 1rem;
    left: 1rem;
    right: 1rem;
    display: flex;
    justify-content: space-between;
    z-index: 5;
    pointer-events: none;
}

.hud-item {
    background: rgba(0, 0, 0, 0.5);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 1px solid rgba(255,255,255,0.1);
    backdrop-filter: blur(4px);
}

.hud-item .label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 700;
    letter-spacing: 1px;
}

.hud-item .value {
    font-size: 1.25rem;
    font-weight: 900;
    font-family: monospace;
}