:root {
    --bg-color: #f0f4f8;
    --text-main: #2c3e50;
    --ui-bg: rgba(240, 244, 248, 0.9);
    --grid-bg: #e1e8f0;
    --grid-line: #cbd5e1;
    
    --color-1: #ff4757; /* Red */
    --color-2: #2ed573; /* Green */
    --color-3: #1e90ff; /* Blue */
    --color-4: #ffa502; /* Orange */
    --color-5: #9b59b6; /* Purple */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
    font-family: 'Quicksand', sans-serif;
}

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
    color: var(--text-main);
    touch-action: none;
}

#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.bg-circles {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.bg-circles::before, .bg-circles::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.bg-circles::before {
    width: 400px; height: 400px;
    background: var(--color-3);
    top: -100px; left: -100px;
    animation: float 20s infinite alternate ease-in-out;
}

.bg-circles::after {
    width: 500px; height: 500px;
    background: var(--color-5);
    bottom: -150px; right: -100px;
    animation: float 25s infinite alternate-reverse ease-in-out;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

canvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1;
    display: block;
}

#ui-layer {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 5;
    pointer-events: none;
    display: none;
}

#top-bar {
    position: absolute;
    top: 30px; left: 50%;
    transform: translateX(-50%);
    display: flex;
}

.level-display {
    background: white;
    padding: 10px 40px;
    border-radius: 30px;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    letter-spacing: 2px;
}

.level-display span {
    color: var(--color-3);
    font-size: 28px;
}

.icon-btn {
    position: absolute;
    width: 50px; height: 50px;
    border-radius: 25px;
    background: white;
    border: none;
    color: var(--text-main);
    font-size: 24px;
    display: flex; justify-content: center; align-items: center;
    pointer-events: auto; cursor: pointer;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.2s;
}

.icon-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

#pause-btn { top: 30px; right: 30px; }
#sound-toggle { top: 30px; right: 90px; }
#restart-level-btn { top: 30px; left: 30px; }

/* Screens */
.screen {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: var(--ui-bg);
    backdrop-filter: blur(15px);
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    z-index: 10;
    opacity: 0; pointer-events: none;
    transition: opacity 0.4s ease;
}

.screen.active {
    opacity: 1; pointer-events: auto;
}

.title-container {
    text-align: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 70px;
    color: var(--text-main);
    line-height: 1;
    letter-spacing: 2px;
}

h2 {
    font-size: 50px;
    color: var(--color-3);
    line-height: 1;
    letter-spacing: 5px;
    margin-bottom: 20px;
}

#level-complete-screen h2, #game-complete-screen h2 {
    color: var(--color-2);
}

.subtitle {
    font-size: 20px;
    color: #7f8c8d;
    margin-bottom: 40px;
    font-weight: 600;
}

.btn {
    padding: 15px 50px;
    font-size: 20px; font-weight: 700;
    border: none; border-radius: 30px;
    cursor: pointer; margin: 10px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    letter-spacing: 1px;
}

.primary-btn {
    background: linear-gradient(135deg, var(--color-3), #0984e3);
    color: white;
    box-shadow: 0 10px 20px rgba(30, 144, 255, 0.3);
}

.primary-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 25px rgba(30, 144, 255, 0.4);
}

.secondary-btn {
    background: white;
    color: var(--text-main);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

.secondary-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 25px rgba(0,0,0,0.1);
}

.instruction-content {
    background: white;
    padding: 30px; border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
    margin-bottom: 30px;
    max-width: 500px; width: 90%;
}

.instruction-content p {
    margin: 15px 0; font-size: 18px; line-height: 1.6;
    color: var(--text-main);
}

.stars {
    font-size: 50px;
    margin-bottom: 30px;
    animation: pulse 2s infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

@media (max-width: 768px) {
    h1 { font-size: 50px; }
    h2 { font-size: 35px; }
    .btn { padding: 12px 30px; font-size: 18px; }
    .level-display { padding: 8px 30px; font-size: 20px; }
    #pause-btn, #sound-toggle, #restart-level-btn { top: 20px; width: 40px; height: 40px; font-size: 20px;}
    #pause-btn { right: 20px; }
    #sound-toggle { right: 70px; }
    #restart-level-btn { left: 20px; }
}