:root {
    --neon-cyan: #d760cf;
    --neon-magenta: #f300f3;
    --dark-bg: #0A0A23;
    --container-bg: #1B1B32;
    --text-color: #F5F6F7;
    --font-family: 'Courier New', Courier, monospace;
}

/* General Styles */
body {
    background-color: var(--dark-bg);
    color: var(--text-color);
    font-family: var(--font-family);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
}
.header {
    position: absolute; top: 15px;
    font-size: 1.1em; color: var(--neon-cyan); text-shadow: 0 0 5px var(--neon-cyan);
}
.game-title {
    color: var(--neon-magenta); font-size: 2.8em; margin-bottom: 10px; text-shadow: 0 0 10px var(--neon-magenta);
}
.hidden { display: none !important; }

/* Main Menu Styles */
.main-menu {
    padding: 30px;
    background-color: var(--container-bg);
    border-radius: 15px; border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}
.menu-subtitle { font-size: 1.2em; margin-bottom: 25px; }
.menu-buttons { display: flex; flex-direction: column; gap: 15px; }
.menu-btn {
    padding: 20px; font-size: 1.5em; font-family: var(--font-family);
    background: transparent; color: var(--neon-cyan);
    border: 2px solid var(--neon-cyan); border-radius: 10px; cursor: pointer;
    transition: all 0.3s;
}
.menu-btn:hover { background-color: var(--neon-cyan); color: var(--dark-bg); box-shadow: 0 0 15px var(--neon-cyan); }
.high-score-display { margin-top: 25px; font-size: 1.3em; }

/* Game Container Styles */
.game-container {
    width: 90%; max-width: 500px;
    background-color: var(--container-bg); padding: 25px;
    border-radius: 15px; border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}
.stats-container {
    display: flex; justify-content: space-between;
    font-size: 1.3em; margin-bottom: 15px;
}
#progress-tracker { font-size: 1.2em; margin-bottom: 15px; }
.problem-container { font-size: 3em; font-weight: bold; min-height: 80px; }
#timer-container { width: 100%; height: 10px; background-color: #000; border-radius: 5px; margin-bottom: 20px; border: 1px solid var(--neon-cyan); }
#timer-bar { height: 100%; width: 100%; background: linear-gradient(90deg, var(--neon-magenta), var(--neon-cyan)); border-radius: 5px; transition: width 0.1s linear; }
.answer-section form { display: flex; gap: 10px; }
#answer-input { flex-grow: 1; padding: 15px; font-size: 1.5em; background-color: var(--dark-bg); border: 2px solid var(--neon-cyan); border-radius: 8px; color: #fff; text-align: center; }
button { font-family: var(--font-family); font-weight: bold; }
button[type="submit"] { padding: 15px 20px; font-size: 1.2em; color: var(--dark-bg); background-color: var(--neon-cyan); border: none; border-radius: 8px; cursor: pointer; }

/* Popup Styles */
.popup-container { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.9); justify-content: center; align-items: center; }
.popup-container.show { display: flex; }
.popup-box { background: var(--container-bg); padding: 40px; border-radius: 15px; border: 2px solid var(--neon-magenta); box-shadow: 0 0 25px var(--neon-magenta); }
#back-to-menu-btn { padding: 15px 30px; font-size: 1.2em; background-color: var(--neon-cyan); color: var(--dark-bg); border: none; border-radius: 8px; cursor: pointer; }