:root {
    --bg-color: #f0fdf4; /* Light green/outdoor tint */
    --container-bg: rgba(255, 255, 255, 0.85);
    --board-bg: #78350f; /* Wood/dirt brown */
    --light-off: #a8a29e; /* Unlit glass/stone */
    --light-on: #fef08a; /* Warm bright lamp */
    --light-on-glow: rgba(253, 224, 71, 0.8);
    --text-primary: #1c1917;
    --text-secondary: #57534e;
    --btn-bg: #16a34a; /* Leaf green */
    --btn-hover: #15803d;
    --accent: #ca8a04;
}

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

body {
    background-color: var(--bg-color);
    /* Soft leaf pattern or texture could go here later with the branding images */
    background-image: radial-gradient(#dcfce7 2px, transparent 2px);
    background-size: 30px 30px;
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    padding: 2.5rem;
    width: 90%;
    max-width: 500px;
    background: var(--container-bg);
    border-radius: 1.5rem;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid #e7e5e4;
}

header {
    text-align: center;
}

.banner-img {
    max-width: 100%;
    height: auto;
    border-radius: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    color: #422006; /* Dark wood text */
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 500;
}

.size-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: -1rem;
    z-index: 10;
}

.size-btn {
    background-color: var(--light-off);
    color: var(--text-primary);
    border: 2px solid transparent;
    padding: 0.4rem 1rem;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    border-radius: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.size-btn:hover {
    background-color: var(--board-bg);
    color: white;
}

.size-btn.active {
    background-color: var(--btn-bg);
    color: white;
    border-color: #14532d;
}

.board {
    display: grid;
    grid-template-columns: repeat(var(--grid-size, 5), minmax(0, 1fr));
    grid-template-rows: repeat(var(--grid-size, 5), minmax(0, 1fr));
    aspect-ratio: 1 / 1;
    width: 100%;
    gap: 3%;
    padding: 3%;
    background-color: var(--board-bg);
    border-radius: 1rem;
    box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.4), 0 4px 6px rgba(0,0,0,0.1);
    /* Adds a bit of wood texture feel */
    background-image: repeating-linear-gradient(
        45deg,
        rgba(0,0,0,0.05),
        rgba(0,0,0,0.05) 10px,
        transparent 10px,
        transparent 20px
    );
}

.cell {
    width: 100%;
    height: 100%;
    border-radius: 50%; /* Round bulbs */
    background-color: var(--light-off);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 3px solid rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 -4px 6px rgba(0,0,0,0.2), 0 4px 6px rgba(0,0,0,0.3);
}

.cell:hover {
    transform: scale(1.05);
    box-shadow: inset 0 -4px 6px rgba(0,0,0,0.2), 0 6px 10px rgba(0,0,0,0.4);
}

.cell.is-on {
    background-color: var(--light-on);
    box-shadow: 0 0 25px var(--light-on-glow), inset 0 0 15px rgba(255, 255, 255, 0.8);
    border-color: rgba(255, 255, 255, 0.8);
}

.controls {
    display: flex;
    justify-content: center;
}

.btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    border-radius: 2rem; /* Pill shape */
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 6px -1px rgba(22, 163, 74, 0.4), 0 2px 4px -1px rgba(22, 163, 74, 0.2);
    border: 2px solid #14532d;
}

.btn:hover {
    background-color: var(--btn-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 8px -1px rgba(22, 163, 74, 0.5);
}

.btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 4px -1px rgba(22, 163, 74, 0.4);
}

.hidden {
    display: none !important;
}

#win-message {
    margin-top: -1rem;
}

#win-message h2 {
    color: #16a34a;
    font-size: 2rem;
    text-shadow: 0 0 10px rgba(22, 163, 74, 0.3);
    animation: bounce 2s infinite;
}

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

@media (max-width: 500px) {
    .app-container {
        padding: 1.5rem 1rem;
        gap: 1.5rem;
        width: 95%; /* ensure it doesn't touch the edges */
    }

    h1 {
        font-size: 2.2rem;
    }
    
    .btn {
        padding: 0.6rem 1.5rem;
        font-size: 1rem;
    }
}