:root {
    --bg-color: #f8f8f8;
    --text-color: #000;
    --container-bg: #fff;
    --border-color: #000;
    --accent-color: #ffff64; 
    --hover-bg: #ffff64;
    --hover-text: #000; 
    --feedback-up: #28a745;
    --feedback-down: #dc3545;
    --beefy-color: #ff4500;
    --fiery-color: #ff0000; 
    
    --combo-meter-bg: #e0e0e0; 
    --combo-meter-fill: #ffff64; 
    --combo-meter-border: #000; 
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #f1f1f1;
    --container-bg: #1e1e1e;
    
    --border-color: #ffb600; 
    --accent-color: #ffb600; 
    
    --hover-bg: #ffb600;
    --hover-text: #000; 
    
    --feedback-up: #4caf50;
    --feedback-down: #ff5252;
    --fiery-color: #ff8c00; 
    
    --combo-meter-bg: #e0e0e0; 
    --combo-meter-fill: var(--fiery-color); 
    --combo-meter-border: #fff; 
}

* {
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Ctext x='10' y='45' font-size='35' opacity='0.08'%3E🧠%3C/text%3E%3Ctext x='60' y='95' font-size='35' opacity='0.08'%3E🧠%3C/text%3E%3C/svg%3E");
    background-repeat: repeat;
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem 1rem; 
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
    animation: scroll-bg 8s linear infinite;
}

@keyframes scroll-bg {
    0% { background-position: 0px 0px; }
    100% { background-position: 100px 100px; }
}

#theme-toggle {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-color);
    border-radius: 8px; 
    padding: 8px 12px;
    box-shadow: 2px 2px 0px var(--accent-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#theme-toggle:hover {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-color);
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0px var(--accent-color);
}

.game-container {
    background-color: var(--container-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem; 
    width: 90%;
    max-width: 500px;
    box-shadow: 4px 4px 0px var(--accent-color);
    text-align: center;
    transition: background-color 0.3s, border-color 0.3s;
    overflow-x: hidden; 
    margin: auto; 
}

header { margin-bottom: 1rem; }

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-top h1 {
    margin: 0;
    transition: all 0.3s ease;
}

.score-board {
    font-size: 1.5rem;
    font-weight: bold;
    margin: 15px 0 10px 0;
    display: flex;
    flex-direction: column; 
    align-items: center;
    gap: 5px;
    width: 100%;
}

.combo-meter-container {
    width: 80%;
    height: 12px; 
    background: var(--combo-meter-bg);
    border: 2px solid var(--combo-meter-border); 
    border-radius: 6px; 
    overflow: hidden;
    margin-top: 5px;
    opacity: 0.3;
}

#combo-meter-fill {
    height: 100%;
    width: 0%;
    background: var(--combo-meter-fill);
    transition: width 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.combo-meter-container.active { opacity: 1; }

.timer {
    font-size: 1rem;
    color: var(--text-color);
    opacity: 0.8;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

button {
    background-color: var(--container-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    padding: 12px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s ease;
}

button:hover {
    background-color: var(--hover-bg);
    color: var(--hover-text); 
}

.icon-btn {
    padding: 8px 12px;
    font-size: 1.2rem;
}

.hidden { display: none !important; }

#start-screen p {
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

@keyframes flash-warning {
    0%, 100% { color: var(--feedback-down); opacity: 1; transform: scale(1); }
    50% { color: var(--feedback-down); opacity: 0.7; transform: scale(1.05); }
}

.timer.warning {
    animation: flash-warning 1s infinite;
    font-weight: bold;
}

#question-wrapper { transition: opacity 0.2s ease, transform 0.2s ease; }

.slide-out {
    opacity: 0;
    transform: translateX(-50px);
}

.slide-in {
    animation: slideInAnim 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes slideInAnim {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

#beefy-indicator {
    color: var(--beefy-color);
    font-weight: 900;
    font-size: 1.2rem;
    margin-bottom: 10px;
    letter-spacing: 1px;
    animation: action-pulse 1s infinite alternate;
}

.beefy-question {
    color: var(--beefy-color) !important;
    animation: action-pulse 1.5s infinite alternate;
}

@keyframes action-pulse {
    from { transform: scale(1); }
    to { transform: scale(1.03); }
}

.hot-song-title {
    animation: action-pulse 0.8s infinite alternate;
}

.hot-song-text {
    color: var(--fiery-color) !important;
    font-size: 1.2rem;
    margin-left: 5px;
}

button.correct {
    background-color: var(--feedback-up) !important;
    color: #fff !important;
    border-color: var(--feedback-up) !important;
}

button.incorrect {
    background-color: var(--feedback-down) !important;
    color: #fff !important;
    border-color: var(--feedback-down) !important;
}

#pyong-btn {
    margin-top: 15px;
    background-color: var(--text-color);
    color: var(--bg-color);
    border: 2px solid var(--text-color);
    width: 100%;
    animation: action-pulse 1s infinite alternate; 
    transition: all 0.2s ease;
}

.feedback {
    position: fixed;
    top: 20px; 
    left: 50%;
    transform: translateX(-50%) translateY(-100px); 
    border: 2px solid; 
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 1.1rem;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3); 
    z-index: 1000; 
    opacity: 0; 
    pointer-events: none;
    white-space: nowrap;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.feedback.show-upvote,
.feedback.show-beefy-upvote { 
    background-color: rgba(40, 167, 69, 0.95); 
    border-color: #1c7430; 
    color: #fff;
    animation: notification-in-out 3s ease forwards;
}

.feedback.show-downvote,
.feedback.show-beefy-downvote { 
    background-color: rgba(220, 53, 69, 0.95); 
    border-color: #a71d2a;
    color: #fff;
    animation: notification-in-out 3s ease forwards;
}

@keyframes notification-in-out {
    0% { opacity: 0; transform: translate(-50%, -100px) scale(0.8); }
    10% { opacity: 1; transform: translate(-50%, 0) scale(1); }
    90% { opacity: 1; transform: translate(-50%, 0) scale(1); }
    100% { opacity: 0; transform: translate(-50%, -10px) scale(0.9); }
}

@keyframes float-up {
    0% { opacity: 1; transform: translateY(0) scale(1); }
    100% { opacity: 0; transform: translateY(-50px) scale(1.2); }
}

.floating-text {
    position: absolute;
    font-weight: 900;
    font-size: 1.8rem;
    pointer-events: none;
    animation: float-up 1s ease-out forwards;
    z-index: 100;
}

.floating-upvote { color: #55ff55; text-shadow: -2px -2px 0 #000, 2px -2px 0 #000, -2px 2px 0 #000, 2px 2px 0 #000, 0px 4px 8px rgba(0,0,0,0.6); }
.floating-downvote { color: #ff5555; text-shadow: -2px -2px 0 #000, 2px -2px 0 #000, -2px 2px 0 #000, 2px 2px 0 #000, 0px 4px 8px rgba(0,0,0,0.6); }

@keyframes shake {
    0% { transform: translateX(0); }
    20% { transform: translateX(-10px); }
    40% { transform: translateX(10px); }
    60% { transform: translateX(-10px); }
    80% { transform: translateX(10px); }
    100% { transform: translateX(0); }
}
.shake { animation: shake 0.4s ease-in-out; }

#game-over h2 {
    margin-top: 0;
    margin-bottom: 10px;
}

#game-over p { margin: 5px 0; }

.rank-display {
    font-size: 1rem; 
    margin: 10px 0; 
    background-color: var(--hover-bg);
    color: var(--hover-text);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    padding: 10px; 
    display: inline-block;
    width: 100%;
}
.rank-display strong {
    display: block;
    font-size: 1.3rem; 
    font-weight: 900;
    margin-top: 2px;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px; 
    margin: 10px 0; 
}

.stats-grid p { 
    background-color: var(--hover-bg);
    color: var(--hover-text);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    padding: 8px 5px; 
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem; 
}

.stats-grid strong { 
    font-size: 1.4rem; 
    font-weight: 900;
    margin-top: 4px;
}

.leaderboard-container {
    background-color: var(--container-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    padding: 10px; 
    margin: 10px 0; 
}

.leaderboard-container h3 { 
    margin: 0 0 10px 0; 
    text-align: center;
    font-size: 1.1rem;
}

#leaderboard-list {
    text-align: left;
    margin: 0;
    padding-left: 0;
    list-style-type: none;
}

#leaderboard-list li { 
    margin-bottom: 4px; 
    padding-bottom: 4px;
    border-bottom: 1px dashed var(--border-color);
    font-size: 0.95rem; 
}

#leaderboard-list li:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

footer {
    width: 100%;
    text-align: center;
    position: fixed;
    bottom: 20px;
    left: 0;
    padding: 0 10px;
}

footer p {
    margin: 0;
    opacity: 0.7;
    font-size: 0.8rem;
}

body {
    padding-bottom: 60px;
}