:root {
    --bg-color: #f8fafc;
    --text-primary: #0f172a;
    --accent-color: #10b981;
    --border-color: rgba(0, 0, 0, 0.1);
    
    --pad-green: #34d399;
    --pad-green-active: #059669;
    --pad-red: #f87171;
    --pad-red-active: #dc2626;
    --pad-yellow: #fde047;
    --pad-yellow-active: #d97706;
    --pad-blue: #60a5fa;
    --pad-blue-active: #2563eb;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background: #ffffff;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    position: relative;
}

header {
    text-align: center;
    width: 100%;
}

.back-btn {
    display: inline-block;
    color: var(--text-primary);
    text-decoration: none;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    opacity: 0.7;
    transition: opacity 0.3s;
    width: 100%;
    text-align: left;
    font-weight: 500;
}

.back-btn:hover {
    opacity: 1;
    color: var(--accent-color);
}

h1 {
    font-weight: 800;
    letter-spacing: 2px;
}

h1 span {
    color: var(--accent-color);
}

.status-board {
    display: flex;
    justify-content: space-between;
    width: 100%;
    align-items: center;
    padding: 0 1rem;
}

#levelText {
    font-size: 1.5rem;
    font-weight: 600;
}

button {
    padding: 0.5rem 1.5rem;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background: var(--text-primary);
    color: #ffffff;
}

.simon-board {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 15px;
    background-color: var(--border-color);
    padding: 15px;
    border-radius: 50%;
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.pad {
    width: 120px;
    height: 120px;
    cursor: pointer;
    transition: background-color 0.1s;
    opacity: 0.8;
}

.pad:hover {
    opacity: 1;
}

.pad.green {
    background-color: var(--pad-green);
    border-top-left-radius: 100%;
}

.pad.red {
    background-color: var(--pad-red);
    border-top-right-radius: 100%;
}

.pad.yellow {
    background-color: var(--pad-yellow);
    border-bottom-left-radius: 100%;
}

.pad.blue {
    background-color: var(--pad-blue);
    border-bottom-right-radius: 100%;
}

/* Active States */
.pad.green.active { background-color: var(--pad-green-active); opacity: 1; box-shadow: 0 0 20px var(--pad-green); }
.pad.red.active { background-color: var(--pad-red-active); opacity: 1; box-shadow: 0 0 20px var(--pad-red); }
.pad.yellow.active { background-color: var(--pad-yellow-active); opacity: 1; box-shadow: 0 0 20px var(--pad-yellow); }
.pad.blue.active { background-color: var(--pad-blue-active); opacity: 1; box-shadow: 0 0 20px var(--pad-blue); }

.center-circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background-color: #ffffff;
    border-radius: 50%;
    border: 15px solid var(--border-color);
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    border-radius: 20px;
    z-index: 10;
}

.overlay.hidden {
    display: none;
}

.overlay h2 {
    color: var(--pad-red-active);
    font-size: 2.5rem;
}

@media (max-width: 500px) {
    .pad {
        width: 100px;
        height: 100px;
    }
    .center-circle {
        width: 80px;
        height: 80px;
        border-width: 10px;
    }
}