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

html {
    background: #0a2342;
    overscroll-behavior: none;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    background: linear-gradient(160deg, #0a2342 0%, #0f4c75 30%, #1a7a6e 65%, #20B2AA 100%);
    background-attachment: fixed;
    overflow-x: hidden;
    position: relative;
    overscroll-behavior: none;
}

/* Animated background orbs */
.bg-orbs { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.25;
    animation: orbFloat 12s ease-in-out infinite;
}

.orb-1 { width: 500px; height: 500px; background: #20B2AA; top: -100px; left: -100px; animation-delay: 0s; }
.orb-2 { width: 400px; height: 400px; background: #3498db; bottom: -50px; right: -50px; animation-delay: -4s; }
.orb-3 { width: 350px; height: 350px; background: #9b59b6; top: 40%; left: 50%; animation-delay: -8s; }

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-section {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2.5rem 1rem 1rem;
}

.game-wrapper {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem 2rem;
}

.game-footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85em;
    letter-spacing: 0.5px;
}

.hidden { display: none !important; }

.game-started .difficulty-selector { display: none; }
.game-started #start-btn { display: none; }

@media (max-width: 768px) {
    .hero-section { padding: 1.5rem 1rem 0.5rem; }
    .game-wrapper { padding: 0 0.5rem 1rem; }
}