/* 🌌 CORE STYLES */
body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    color: white;
    text-align: center;
    background: radial-gradient(circle at top, #020617, #000);
    overflow: hidden; /* Prevents whole page bounce */
    height: 100vh;
    display: flex;
    flex-direction: column;
}

canvas { 
    position: fixed; 
    top: 0; 
    left: 0; 
    z-index: -1; 
}

/* 🖥️ UI OVERLAYS (Menu & Victory) */
#menu, .victory-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(15px);
    z-index: 100;
    padding: 20px; /* Space for mobile edges */
}

.menu-box, .victory-box {
    width: 100%;
    max-width: 400px;
    max-height: 90vh; /* Prevents overflow on short phones */
    overflow-y: auto; /* Makes menu scrollable if too tall */
    padding: 25px;
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 50px rgba(56, 189, 248, 0.2);
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* 🏆 VICTORY SPECIFICS */
.victory-box { animation: slideUp 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
.trophy { font-size: 50px; animation: bounce 2s infinite; }
.victory-btns { display: flex; flex-direction: column; gap: 10px; }

@keyframes slideUp {
    from { transform: translateY(50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* 💡 TEXT & EFFECTS */
h1, h2 { color: #38bdf8; animation: glow 2s infinite; margin: 5px 0; }
p { margin: 5px 0; font-size: 0.9rem; opacity: 0.7; text-transform: uppercase; }

@keyframes glow {
    0%, 100% { text-shadow: 0 0 10px #38bdf8; }
    50% { text-shadow: 0 0 25px #38bdf8; }
}

/* 🕹️ CONTROLS */
input, .btn-group button, .level-btn {
    padding: 12px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255, 255, 255, 0.08);
    color: white;
    cursor: pointer;
    font-size: 1rem;
    transition: 0.2s;
}

input { cursor: text; background: rgba(0,0,0,0.2); }

.btn-group { display: flex; gap: 8px; }
.btn-group button.active, .level-btn.active {
    background: #38bdf8;
    color: black;
    box-shadow: 0 0 15px #38bdf8;
    border-color: #38bdf8;
}

#levels {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    max-height: 140px;
    overflow-y: auto;
    padding: 10px;
    background: rgba(0,0,0,0.2);
    border-radius: 12px;
}

.start-btn {
    padding: 15px;
    border: none;
    border-radius: 15px;
    background: #38bdf8;
    color: black;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(56, 189, 248, 0.4);
}

.secondary-btn {
    background: transparent;
    color: #38bdf8;
    border: 1px solid #38bdf8;
    padding: 12px;
    border-radius: 15px;
    cursor: pointer;
}

/* 🃏 GAME GRID & CARDS */
#stats { margin: 15px 0 5px; font-size: 1.1rem; }
#turn { color: #38bdf8; font-weight: bold; min-height: 1.2rem; margin-bottom: 10px;}

.grid { 
    display: grid; 
    gap: 8px; 
    justify-content: center; 
    padding-bottom: 30px; 
    margin: 0 auto;
}

/* This makes cards shrink perfectly on small phones */
.card { 
    width: min(70px, 18vw); 
    height: min(70px, 18vw); 
    perspective: 1000px; 
}

.inner { width: 100%; height: 100%; transform-style: preserve-3d; transition: 0.6s cubic-bezier(0.4, 0, 0.2, 1); position: relative; }
.flipped .inner { transform: rotateY(180deg); }

.front, .back {
    position: absolute; width: 100%; height: 100%; border-radius: 10px;
    display: flex; align-items: center; justify-content: center; backface-visibility: hidden;
    border: 1px solid rgba(255,255,255,0.1);
}

.front { background: #1e293b; }
.back { background: #38bdf8; color: black; transform: rotateY(180deg); font-size: min(30px, 8vw); }

/* Custom Scrollbar for Level Grid */
#levels::-webkit-scrollbar { width: 5px; }
#levels::-webkit-scrollbar-thumb { background: #38bdf8; border-radius: 10px; }

@media(max-width: 500px) { 
    h1 { font-size: 1.8rem; }
    .menu-box { padding: 20px; gap: 12px; }
}    position: absolute; width: 100%; height: 100%; border-radius: 12px;
    display: flex; align-items: center; justify-content: center; backface-visibility: hidden;
}

.front { background: rgba(30, 41, 59, 0.8); border: 1px solid rgba(255, 255, 255, 0.1); }
.back { background: #38bdf8; color: black; transform: rotateY(180deg); font-size: 30px; }

@media(max-width: 500px) { h1 { font-size: 28px; } }