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

body {
    font-family: 'Inter', 'Poppins', sans-serif;
    background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    min-height: 100vh;
    color: #fff;
    overflow-x: hidden;
    position: relative;
}

/* Animated Background */
.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
    0% {
        transform: translateY(0);
    }
    100% {
        transform: translateY(-40px);
    }
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: floatOrb 15s infinite ease-in-out;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #667eea, #764ba2);
    top: -150px;
    left: -150px;
    animation-delay: 0s;
}

.orb-2 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, #f093fb, #f5576c);
    bottom: -100px;
    right: -100px;
    animation-delay: 5s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, #4facfe, #00f2fe);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes floatOrb {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -30px) scale(1.1);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.9);
    }
    75% {
        transform: translate(20px, 30px) scale(1.05);
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes cardFlip {
    0% {
        transform: rotateY(0deg);
    }
    100% {
        transform: rotateY(180deg);
    }
}

@keyframes cardMatch {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes pulseGlow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.7);
    }
    50% {
        box-shadow: 0 0 0 15px rgba(102, 126, 234, 0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.fade-in-up {
    animation: fadeIn 0.6s ease-out forwards;
    opacity: 0;
}

.fade-in-up:nth-child(1) { animation-delay: 0.1s; }
.fade-in-up:nth-child(2) { animation-delay: 0.2s; }
.fade-in-up:nth-child(3) { animation-delay: 0.3s; }

/* Cards */
.header-card, .stat-card, .controls-card, .game-card, .leaderboard-card {
    background: rgba(18, 18, 35, 0.75);
    backdrop-filter: blur(20px);
    border-radius: 28px;
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.header-card:hover, .game-card:hover {
    transform: translateY(-3px);
    border-color: rgba(102, 126, 234, 0.3);
}

/* Header */
.logo-wrapper {
    margin-bottom: 15px;
}

.memory-icon {
    position: relative;
    display: inline-block;
    font-size: 3rem;
}

.memory-icon i:first-child {
    color: #667eea;
    animation: pulseGlow 2s infinite;
}

.puzzle-icon {
    position: absolute;
    font-size: 1.5rem;
    bottom: -10px;
    right: -15px;
    color: #f093fb;
}

.app-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin: 0;
    letter-spacing: -1px;
}

.gradient-text {
    background: linear-gradient(135deg, #667eea, #764ba2, #f093fb);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.app-subtitle {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    margin: 5px 0 0;
}

/* Stat Cards */
.stat-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 18px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-info {
    flex: 1;
}

.stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: rgba(255, 255, 255, 0.5);
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1;
}

/* Controls */
.controls-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.difficulty-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.control-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
}

.difficulty-buttons {
    display: flex;
    gap: 10px;
}

.difficulty-btn {
    padding: 8px 18px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s;
}

.difficulty-btn:hover {
    background: rgba(102, 126, 234, 0.3);
    transform: translateY(-2px);
}

.difficulty-btn.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-color: transparent;
}

.game-actions {
    display: flex;
    gap: 12px;
}

.btn-new-game, .btn-reset {
    padding: 8px 20px;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.3s;
}

.btn-new-game {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn-new-game:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.btn-reset {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-reset:hover {
    background: rgba(255, 68, 68, 0.2);
    border-color: #ff4466;
}

/* Game Board */
.game-card {
    padding: 30px;
}

.game-board {
    display: grid;
    gap: 15px;
    justify-content: center;
    margin: 0 auto;
}

/* Easy - 4x3 (12 cards) */
.game-board.easy {
    grid-template-columns: repeat(4, minmax(80px, 120px));
}

/* Medium - 4x4 (16 cards) */
.game-board.medium {
    grid-template-columns: repeat(4, minmax(80px, 100px));
}

/* Hard - 6x4 (24 cards) */
.game-board.hard {
    grid-template-columns: repeat(6, minmax(70px, 90px));
}

/* Card Styling */
.card {
    aspect-ratio: 1;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 16px;
    cursor: pointer;
    position: relative;
    transition: all 0.4s cubic-bezier(0.4, 0.0, 0.2, 1);
    transform-style: preserve-3d;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.card.flipped {
    transform: rotateY(180deg);
}

.card.matched {
    animation: cardMatch 0.5s ease;
    opacity: 0.6;
    cursor: default;
    transform: scale(0.95);
}

.card.matched:hover {
    transform: scale(0.95);
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.card-back {
    background: linear-gradient(135deg, #667eea, #764ba2);
    transform: rotateY(0deg);
}

.card-back::before {
    content: "?";
    font-size: 2rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.8);
}

.card-front {
    background: white;
    transform: rotateY(180deg);
}

.card.flipped .card-front {
    animation: cardFlip 0.4s ease;
}

/* Card Icons */
.card-front i {
    font-size: 2rem;
    color: linear-gradient(135deg, #667eea, #764ba2);
}

/* Shake animation for wrong match */
.card.shake {
    animation: shake 0.3s ease-in-out;
}

/* Leaderboard */
.leaderboard-card {
    padding: 20px;
}

.card-header-custom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.btn-clear-leaderboard {
    padding: 6px 12px;
    background: rgba(255, 68, 68, 0.1);
    border: 1px solid rgba(255, 68, 68, 0.3);
    border-radius: 20px;
    color: #ff4466;
    font-size: 0.75rem;
    transition: all 0.2s;
}

.btn-clear-leaderboard:hover {
    background: rgba(255, 68, 68, 0.2);
    transform: translateY(-1px);
}

.leaderboard-list {
    max-height: 200px;
    overflow-y: auto;
}

.leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    margin-bottom: 8px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    transition: all 0.2s;
    animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.leaderboard-item:hover {
    transform: translateX(5px);
    background: rgba(102, 126, 234, 0.1);
}

.leaderboard-rank {
    font-weight: 700;
    font-size: 1.1rem;
    color: #ffd700;
}

.leaderboard-rank.gold { color: #ffd700; }
.leaderboard-rank.silver { color: #c0c0c0; }
.leaderboard-rank.bronze { color: #cd7f32; }

.leaderboard-details {
    flex: 1;
    margin-left: 15px;
}

.leaderboard-score {
    font-weight: 700;
    color: #00ffff;
}

.leaderboard-date {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.4);
}

.empty-state-leaderboard {
    text-align: center;
    padding: 30px;
    color: rgba(255, 255, 255, 0.4);
}

.empty-state-leaderboard i {
    font-size: 2rem;
    margin-bottom: 10px;
}

/* Win Modal */
.win-modal {
    background: linear-gradient(135deg, rgba(18, 18, 35, 0.98), rgba(30, 30, 50, 0.98));
    backdrop-filter: blur(20px);
    border: 1px solid rgba(102, 126, 234, 0.5);
    border-radius: 30px;
}

.win-animation {
    position: relative;
    margin: 20px 0;
}

.win-animation i:first-child {
    font-size: 5rem;
    color: #ffd700;
    animation: bounce 0.5s ease;
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.star-1, .star-2, .star-3 {
    position: absolute;
    font-size: 1.5rem;
    color: #ffd700;
    animation: starTwinkle 1s infinite;
}

.star-1 {
    top: -20px;
    left: 20px;
    animation-delay: 0s;
}

.star-2 {
    top: -10px;
    right: 30px;
    animation-delay: 0.3s;
}

.star-3 {
    bottom: -10px;
    left: 40px;
    animation-delay: 0.6s;
}

@keyframes starTwinkle {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.win-title {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin: 15px 0;
}

.win-stats {
    display: flex;
    justify-content: space-around;
    margin: 20px 0;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
}

.win-stat {
    text-align: center;
}

.win-stat span {
    display: block;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 5px;
}

.win-stat strong {
    font-size: 1.2rem;
    color: #667eea;
}

.btn-play-again {
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    border-radius: 40px;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
}

.btn-play-again:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .controls-card {
        flex-direction: column;
        align-items: stretch;
    }
    
    .difficulty-section {
        justify-content: center;
    }
    
    .game-actions {
        justify-content: center;
    }
    
    .game-board.easy {
        grid-template-columns: repeat(4, minmax(70px, 85px));
        gap: 10px;
    }
    
    .game-board.medium {
        grid-template-columns: repeat(4, minmax(70px, 80px));
        gap: 10px;
    }
    
    .game-board.hard {
        grid-template-columns: repeat(4, minmax(70px, 80px));
        gap: 10px;
    }
    
    .stat-value {
        font-size: 1.3rem;
    }
    
    .app-title {
        font-size: 1.8rem;
    }
    
    .memory-icon {
        font-size: 2rem;
    }
    
    .puzzle-icon {
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .game-card {
        padding: 15px;
    }
    
    .difficulty-btn {
        padding: 6px 12px;
        font-size: 0.7rem;
    }
    
    .card-front i, .card-back::before {
        font-size: 1.2rem;
    }
}