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

/* ---------- Page ---------- */
body {
    min-height: 100vh;
    background: linear-gradient(135deg, #dff9fb, #c7ecee);
    text-align: center;
    font-family: "Segoe UI", Tahoma, sans-serif;
    color: #222;
}

h1 {
    margin-top: 1.5rem;
    font-size: 2.5rem;
    letter-spacing: 1px;
}

/* ---------- Game Layout ---------- */
.container {
    height: 70vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.game {
    height: 60vmin;
    width: 60vmin;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5vmin;
    justify-content: center;
    align-items: center;
    padding: 1vmin;
    border-radius: 1.5rem;
    background: rgba(255, 255, 255, 0.5);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* ---------- Boxes ---------- */
.box {
    height: 18vmin;
    width: 18vmin;
    border-radius: 1rem;
    border: none;
    font-size: 8vmin;
    font-weight: bold;
    cursor: pointer;

    background: #fff3b0;
    color: #e74c3c;

    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
    transition: 
        transform 0.15s ease,
        box-shadow 0.15s ease,
        background-color 0.15s ease;
}

.box:hover {
    background-color: #ffe066;
    transform: translateY(-4px);
    box-shadow: 0 12px 22px rgba(0, 0, 0, 0.25);
}

.box:disabled {
    cursor: not-allowed;
    opacity: 0.9;
}

/* ---------- Buttons ---------- */
#reset,
#new-btn {
    margin-top: 1.5rem;
    padding: 0.9rem 1.8rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 1rem;
    border: none;
    cursor: pointer;

    background: #2d3436;
    color: #fff;

    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.25);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

#reset:hover,
#new-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

/* ---------- Message Overlay ---------- */
.msg-container {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    z-index: 10;
}

#msg {
    font-size: 3rem;
    font-weight: bold;
    color: #fff;
    text-align: center;
}

/* ---------- Utility ---------- */
.hide {
    display: none;
}

/* 🎆 Fireworks */
.firework {
    position: fixed;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    pointer-events: none;
    animation: explode 1.2s ease-out forwards;
}

@keyframes explode {
    0% {
        transform: scale(0.3);
        opacity: 1;
    }
    100% {
        transform: translate(var(--x), var(--y)) scale(1.2);
        opacity: 0;
    }
}