:root {
    --bg-color: #020205;
    --primary: #00ffcc;
    --secondary: #7b00ff;
    --danger: #ff0055;
    --text-main: #ffffff;
    --ui-bg: rgba(2, 2, 5, 0.9);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
    font-family: 'Rajdhani', 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;
    background: linear-gradient(180deg, #050015 0%, #020205 50%, #050015 100%);
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    display: block;
    /* Adding subtle motion blur effect for fast pace feel */
    filter: drop-shadow(0 0 10px rgba(0,255,204,0.2));
}

#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: 20px;
    left: 20px;
    display: flex;
    gap: 20px;
}

.stat-box {
    background: rgba(0, 255, 204, 0.1);
    border: 1px solid var(--primary);
    padding: 5px 15px;
    border-radius: 5px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
    box-shadow: 0 0 10px rgba(0, 255, 204, 0.2);
}

.stat-box .label {
    font-size: 12px;
    color: #888;
    letter-spacing: 2px;
}

.stat-box .value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    text-shadow: 0 0 5px var(--primary);
}

#score-container {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 48px;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 15px #fff;
}

.icon-btn {
    position: absolute;
    width: 45px;
    height: 45px;
    border-radius: 5px;
    background: rgba(123, 0, 255, 0.1);
    border: 1px solid var(--secondary);
    color: var(--text-main);
    font-size: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    pointer-events: auto;
    cursor: pointer;
    backdrop-filter: blur(5px);
    transition: all 0.2s;
}

.icon-btn:hover {
    background: rgba(123, 0, 255, 0.4);
    box-shadow: 0 0 15px var(--secondary);
}

#pause-btn { top: 20px; right: 20px; }
#sound-toggle { top: 20px; right: 75px; }

/* Screens */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--ui-bg);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

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

.game-logo {
    width: 100px;
    height: 100px;
    border-radius: 15px;
    box-shadow: 0 0 20px var(--primary);
    margin-bottom: 20px;
}

h1 {
    font-size: 56px;
    color: var(--text-main);
    text-shadow: 0 0 10px var(--primary), 2px 2px 0px var(--secondary);
    margin-bottom: 5px;
    text-align: center;
    text-transform: uppercase;
    font-weight: 700;
}

h2 {
    font-size: 40px;
    color: var(--danger);
    text-shadow: 0 0 15px var(--danger);
    margin-bottom: 30px;
    text-align: center;
    text-transform: uppercase;
}

.subtitle {
    font-size: 20px;
    color: #ccc;
    margin-bottom: 40px;
    letter-spacing: 2px;
}

.btn {
    padding: 15px 50px;
    font-size: 22px;
    font-weight: 700;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin: 10px;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    overflow: hidden;
}

.primary-btn {
    background: rgba(0, 255, 204, 0.1);
    color: var(--primary);
    border: 2px solid var(--primary);
    box-shadow: 0 0 10px rgba(0, 255, 204, 0.3);
}

.primary-btn:hover {
    background: var(--primary);
    color: var(--bg-color);
    box-shadow: 0 0 25px var(--primary);
}

.secondary-btn {
    background: rgba(123, 0, 255, 0.1);
    color: var(--secondary);
    border: 2px solid var(--secondary);
}

.secondary-btn:hover {
    background: var(--secondary);
    color: var(--text-main);
    box-shadow: 0 0 20px var(--secondary);
}

.instruction-content {
    background: rgba(0, 0, 0, 0.6);
    padding: 30px;
    border-radius: 10px;
    border-left: 4px solid var(--primary);
    margin-bottom: 40px;
    max-width: 500px;
    width: 90%;
}

.instruction-content p {
    margin: 15px 0;
    font-size: 20px;
}

.final-score, .best-score {
    font-size: 28px;
    margin: 10px 0;
}

.final-score span { color: var(--primary); text-shadow: 0 0 10px var(--primary); }
.best-score span { color: #ffd700; text-shadow: 0 0 10px #ffd700; }

@media (max-width: 768px) {
    h1 { font-size: 40px; }
    h2 { font-size: 32px; }
    .btn { padding: 12px 30px; font-size: 18px; }
    #score-container { font-size: 36px; top: 15px; }
    #top-bar { transform: scale(0.8); transform-origin: top left; }
}