:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #f72585;
    --success: #4cc9f0;
    --danger: #f72585;
    --warning: #fca311;
    --info: #4895ef;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --white: #ffffff;
    --black: #000000;
    
    --bg-gradient: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
    --bg-gradient-dark: linear-gradient(135deg, #0d1b2a, #1b263b, #415a77);
    --card-bg: rgba(255, 255, 255, 0.1);
    --card-bg-dark: rgba(0, 0, 0, 0.2);
    --text-color: var(--light);
    --text-color-dark: var(--light);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.4);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-border-dark: rgba(0, 0, 0, 0.3);
    
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-gradient: var(--bg-gradient-dark);
    --card-bg: var(--card-bg-dark);
    --text-color: var(--text-color-dark);
    --shadow: var(--shadow-dark);
    --glass-border: var(--glass-border-dark);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    line-height: 1.6;
    transition: var(--transition);
    position: relative;
    overflow-x: hidden;
}

.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(var(--primary) 1px, transparent 1px),
        radial-gradient(var(--secondary) 1px, transparent 1px);
    background-position: 0 0, 25px 25px;
    background-size: 50px 50px;
    opacity: 0.2;
    animation: particlesMove 30s linear infinite;
}

@keyframes particlesMove {
    0% { background-position: 0 0, 25px 25px; }
    100% { background-position: 50px 50px, 75px 75px; }
}

header {
    width: 100%;
    max-width: 1000px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
}

.header-content {
    text-align: left;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 800;
}

.instruction {
    font-size: 1.1rem;
    color: var(--text-color);
    opacity: 0.9;
}

.header-controls {
    display: flex;
    gap: 0.5rem;
}

.control-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.control-btn:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.control-btn.small {
    width: 30px;
    height: 30px;
    font-size: 0.8rem;
}

main {
    width: 100%;
    max-width: 1000px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Game Mode Section */
.game-mode {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 1.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
}

.game-mode h2 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.mode-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.mode-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.mode-btn:hover, .mode-btn.active {
    background: var(--primary);
    transform: translateY(-2px);
}

/* Choices Section */
.choices {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

@media (min-width: 768px) {
    .choices {
        flex-direction: row;
        justify-content: center;
    }
}

.choice-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--card-bg);
    color: var(--white);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.choice-btn:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    background: rgba(67, 97, 238, 0.3);
}

.choice-btn:active {
    transform: translateY(0) scale(0.98);
}

.choice-btn .icon {
    font-size: 3rem;
    transition: var(--transition);
}

.choice-btn:hover .icon {
    transform: scale(1.2);
}

/* Results Section */
.results {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 1.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
}

.result-header h2 {
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.result-content {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.choice-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 120px;
}

.choice-icon-container {
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border-radius: 50%;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.choice-icon {
    font-size: 3rem;
    transition: var(--transition);
}

.vs {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
    display: flex;
    align-items: center;
    padding: 0 1rem;
}

.result-message {
    font-size: 1.5rem;
    font-weight: 600;
    min-height: 2.5rem;
    padding: 1rem;
    border-radius: 10px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

/* Scoreboard Section */
.scoreboard {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 1.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
}

.scores {
    display: flex;
    justify-content: space-around;
    margin-bottom: 1.5rem;
}

.score-player, .score-computer {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.score-value {
    font-size: 2.5rem;
    font-weight: 700;
}

.game-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 1.5rem;
    background: var(--card-bg);
    padding: 1rem;
    border-radius: 10px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.8rem;
    opacity: 0.8;
}

.scoreboard-controls {
    display: flex;
    justify-content: center;
}

.reset-btn {
    padding: 0.8rem 1.5rem;
    background: var(--warning);
    color: var(--white);
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.reset-btn:hover {
    background: #e67e22;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(230, 126, 34, 0.4);
}

/* Leaderboard Section */
.leaderboard {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 1.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
}

.leaderboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.leaderboard-header h2 {
    font-size: 1.5rem;
}

.leaderboard-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border-radius: 10px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.rank {
    font-weight: 700;
    width: 30px;
    text-align: left;
}

.score {
    font-weight: 600;
    flex-grow: 1;
    text-align: center;
}

.date {
    font-size: 0.8rem;
    opacity: 0.7;
    width: 80px;
    text-align: right;
}

/* Footer */
footer {
    margin-top: auto;
    padding: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

.heart {
    color: var(--secondary);
    animation: heartbeat 1.5s infinite;
}

@keyframes heartbeat {
    0% { transform: scale(1); }
    5% { transform: scale(1.1); }
    10% { transform: scale(1); }
    15% { transform: scale(1.1); }
    20% { transform: scale(1); }
    100% { transform: scale(1); }
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 1.5rem;
    width: 90%;
    max-width: 500px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
    transform: translateY(-50px);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
}

.modal-header h2 {
    font-size: 1.5rem;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

.modal-body {
    margin-bottom: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.modal-btn {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.modal-btn.confirm {
    background: var(--danger);
    color: var(--white);
}

.modal-btn.cancel {
    background: var(--gray);
    color: var(--white);
}

.modal-btn:hover {
    transform: translateY(-2px);
}

.rules {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}

.rule {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem;
    background: var(--card-bg);
    border-radius: 10px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.rule-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    border-radius: 50%;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--card-bg);
    color: var(--text-color);
    padding: 1rem 2rem;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
    z-index: 1001;
    opacity: 0;
    transition: var(--transition);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Animations and States */
.win {
    color: var(--success);
    text-shadow: 0 0 10px rgba(76, 201, 240, 0.5);
}

.lose {
    color: var(--danger);
}

.draw {
    color: var(--warning);
}

.win-glow {
    box-shadow: 0 0 20px var(--success);
    animation: pulse 1s infinite;
}

.lose-shake {
    animation: shake 0.5s ease-in-out;
}

.draw-fade {
    animation: fade 1s ease-in-out;
}

.thinking .choice-icon {
    animation: thinking 1s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@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); }
}

@keyframes fade {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

@keyframes thinking {
    0% { transform: rotate(0deg); }
    25% { transform: rotate(10deg); }
    50% { transform: rotate(0deg); }
    75% { transform: rotate(-10deg); }
    100% { transform: rotate(0deg); }
}

/* Confetti canvas */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 999;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .mode-buttons {
        flex-wrap: wrap;
    }
    
    .result-content {
        flex-direction: column;
    }
    
    .scores, .game-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .modal-footer {
        flex-direction: column;
    }
}