@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700&display=swap');

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

body {
font-family: 'Montserrat', sans-serif;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
min-height: 100vh;
overflow-x: hidden;
}

/* Enhanced Preloader Styles */
.preloader {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
z-index: 9999;
transition: opacity 0.8s ease-out, transform 0.8s ease-out;
overflow: hidden;
}

.preloader.hidden {
opacity: 0;
transform: scale(0.95);
pointer-events: none;
}

/* Floating particles background */
.particles {
position: absolute;
width: 100%;
height: 100%;
overflow: hidden;
}

.particle {
position: absolute;
background: rgba(255, 255, 255, 0.1);
border-radius: 50%;
animation: float 6s infinite ease-in-out;
backdrop-filter: blur(2px);
}

.particle:nth-child(1) {
width: 20px;
height: 20px;
left: 10%;
animation-delay: 0s;
}

.particle:nth-child(2) {
width: 30px;
height: 30px;
left: 20%;
animation-delay: 1s;
}

.particle:nth-child(3) {
width: 15px;
height: 15px;
left: 30%;
animation-delay: 2s;
}

.particle:nth-child(4) {
width: 25px;
height: 25px;
left: 40%;
animation-delay: 0.5s;
}

.particle:nth-child(5) {
width: 18px;
height: 18px;
left: 50%;
animation-delay: 1.5s;
}

.particle:nth-child(6) {
width: 22px;
height: 22px;
left: 60%;
animation-delay: 2.5s;
}

.particle:nth-child(7) {
width: 28px;
height: 28px;
left: 70%;
animation-delay: 3s;
}

.particle:nth-child(8) {
width: 16px;
height: 16px;
left: 80%;
animation-delay: 3.5s;
}

.particle:nth-child(9) {
width: 24px;
height: 24px;
left: 90%;
animation-delay: 4s;
}

@keyframes float {

0%,
100% {
transform: translateY(100vh) rotate(0deg);
opacity: 0;
}

10% {
opacity: 1;
}

90% {
opacity: 1;
}

50% {
transform: translateY(-10vh) rotate(180deg);
opacity: 0.8;
}
}

/* Memory cards animation loader */
.memory-loader {
display: flex;
gap: 15px;
margin-bottom: 50px;
perspective: 1000px;
}

.loader-card {
width: 60px;
height: 60px;
position: relative;
transform-style: preserve-3d;
animation: cardFlip 2s infinite ease-in-out;
}

.loader-card:nth-child(2) {
animation-delay: 0.2s;
}

.loader-card:nth-child(3) {
animation-delay: 0.4s;
}

.loader-card:nth-child(4) {
animation-delay: 0.6s;
}

.loader-card-face {
position: absolute;
width: 100%;
height: 100%;
backface-visibility: hidden;
border-radius: 12px;
display: flex;
justify-content: center;
align-items: center;
font-size: 24px;
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
border: 2px solid rgba(255, 255, 255, 0.2);
}

.loader-card-back {
background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
color: white;
font-weight: 700;
}

.loader-card-back::before {
content: '?';
font-size: 28px;
opacity: 0.8;
text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.loader-card-front {
background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
transform: rotateY(180deg);
color: #333;
font-weight: 700;
}

@keyframes cardFlip {

0%,
20% {
transform: rotateY(0deg) scale(1);
}

50% {
transform: rotateY(180deg) scale(1.1);
}

80%,
100% {
transform: rotateY(360deg) scale(1);
}
}

/* Enhanced spinner */
.spinner-container {
position: relative;
margin-bottom: 40px;
}

.spinner {
width: 80px;
height: 80px;
border: 4px solid rgba(255, 255, 255, 0.1);
border-top: 4px solid #ffd700;
border-right: 4px solid #ff6b6b;
border-radius: 50%;
animation: spin 1.5s linear infinite;
position: relative;
}

.spinner::before {
content: '';
position: absolute;
top: -8px;
left: -8px;
right: -8px;
bottom: -8px;
border: 2px solid rgba(255, 255, 255, 0.05);
border-top: 2px solid rgba(255, 215, 0, 0.3);
border-radius: 50%;
animation: spin 2s linear infinite reverse;
}

.spinner-glow {
position: absolute;
top: -15px;
left: -15px;
right: -15px;
bottom: -15px;
border-radius: 50%;
background: radial-gradient(circle, rgba(255, 215, 0, 0.1) 0%, transparent 70%);
animation: glow 2s ease-in-out infinite alternate;
}

@keyframes spin {
0% {
transform: rotate(0deg);
}

100% {
transform: rotate(360deg);
}
}

@keyframes glow {
0% {
opacity: 0.5;
transform: scale(1);
}

100% {
opacity: 1;
transform: scale(1.2);
}
}

/* Enhanced text animations */
.preloader-text {
color: white;
font-size: clamp(24px, 5vw, 42px);
font-weight: 700;
text-align: center;
opacity: 0;
animation: textReveal 1s ease-out 0.5s forwards;
position: relative;
text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
background: linear-gradient(45deg, #fff, #ffd700, #fff);
background-size: 200% 200%;
-webkit-background-clip: text;
background-clip: text;
-webkit-text-fill-color: transparent;
animation: textReveal 1s ease-out 0.5s forwards, shimmer 3s ease-in-out infinite;
}

.preloader-subtitle {
color: rgba(255, 255, 255, 0.9);
font-size: 16px;
font-weight: 300;
margin-top: 20px;
opacity: 0;
animation: slideUpFade 1s ease-out 1s forwards;
text-align: center;
letter-spacing: 0.5px;
}

.loading-progress {
width: 200px;
height: 4px;
background: rgba(255, 255, 255, 0.1);
border-radius: 2px;
margin-top: 30px;
overflow: hidden;
opacity: 0;
animation: slideUpFade 1s ease-out 1.5s forwards;
}

.progress-bar {
height: 100%;
background: linear-gradient(90deg, #ffd700, #ff6b6b, #4facfe);
background-size: 200% 100%;
border-radius: 2px;
animation: loadProgress 2s ease-out forwards, gradientMove 2s ease-in-out infinite;
width: 0%;
}

@keyframes textReveal {
from {
opacity: 0;
transform: translateY(30px) scale(0.8);
filter: blur(10px);
}

to {
opacity: 1;
transform: translateY(0) scale(1);
filter: blur(0px);
}
}

@keyframes shimmer {

0%,
100% {
background-position: 0% 50%;
}

50% {
background-position: 100% 50%;
}
}

@keyframes slideUpFade {
from {
opacity: 0;
transform: translateY(20px);
}

to {
opacity: 1;
transform: translateY(0);
}
}

@keyframes loadProgress {
from {
width: 0%;
}

to {
width: 100%;
}
}

@keyframes gradientMove {
0% {
background-position: 0% 50%;
}

50% {
background-position: 100% 50%;
}

100% {
background-position: 0% 50%;
}
}

/* Pulsing dots */
.loading-dots {
display: flex;
gap: 8px;
margin-top: 20px;
opacity: 0;
animation: slideUpFade 1s ease-out 2s forwards;
}

.dot {
width: 8px;
height: 8px;
background: rgba(255, 255, 255, 0.6);
border-radius: 50%;
animation: dotPulse 1.4s ease-in-out infinite both;
}

.dot:nth-child(2) {
animation-delay: 0.16s;
}

.dot:nth-child(3) {
animation-delay: 0.32s;
}

@keyframes dotPulse {

0%,
80%,
100% {
transform: scale(0.8);
opacity: 0.5;
}

40% {
transform: scale(1.2);
opacity: 1;
}
}

/* Game Container */
.game-container {
max-width: 640px;
margin: 0 auto;
padding: 20px;
opacity: 0;
transform: translateY(30px) scale(0.95);
transition: all 1s cubic-bezier(0.23, 1, 0.320, 1);
}

.game-container.loaded {
opacity: 1;
transform: translateY(0) scale(1);
}

/* Header */
.header {
text-align: center;
margin-bottom: 15px;
color: white;
}

.title {
font-size: clamp(1.5rem, 5vw, 4rem);
font-weight: 700;
margin-bottom: 10px;
text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
background: linear-gradient(45deg, #fff, #e0e7ff);
-webkit-background-clip: text;
background-clip: text;
}

.subtitle {
font-size: 18px;
font-weight: 300;
opacity: 0.9;
margin-top: 30px;
}

/* Stats and Controls */
.controls {
display: flex;
justify-content: space-between;
align-items: center;
background: rgba(255, 255, 255, 0.1);
backdrop-filter: blur(20px);
padding: 20px;
border-radius: 20px;
margin-bottom: 20px;
border: 1px solid rgba(255, 255, 255, 0.2);
flex-wrap: wrap;
gap: 15px;
}

.stats {
display: flex;
gap: 30px;
color: white;
font-weight: 600;
}

.stat {
text-align: center;
}

.stat-value {
font-size: 24px;
display: block;
color: #ffd700;
}

.stat-label {
font-size: 12px;
opacity: 0.8;
text-transform: uppercase;
letter-spacing: 1px;
}

.control-buttons {
display: flex;
gap: 15px;
}

.btn {
padding: 12px 24px;
border: none;
border-radius: 12px;
font-weight: 600;
cursor: pointer;
transition: all 0.3s ease;
font-size: 14px;
text-transform: uppercase;
letter-spacing: 0.5px;
}

.btn-primary {
background: linear-gradient(45deg, #ff6b6b, #ff8e8e);
color: white;
box-shadow: 0 4px 20px rgba(255, 107, 107, 0.4);
}

.btn-secondary {
background: rgba(255, 255, 255, 0.2);
color: white;
border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn:hover {
transform: translateY(-2px);
box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.btn:active {
transform: translateY(0);
}

/* Difficulty Selector */
.difficulty-selector {
background: rgba(255, 255, 255, 0.1);
backdrop-filter: blur(20px);
padding: 15px;
border-radius: 20px;
margin-bottom: 15px;
border: 1px solid rgba(255, 255, 255, 0.2);
text-align: center;
}

.difficulty-title {
color: white;
font-size: 18px;
font-weight: 600;
margin-bottom: 15px;
}

.difficulty-buttons {
display: flex;
justify-content: center;
gap: 15px;
flex-wrap: wrap;
}

.difficulty-btn {
padding: 10px 20px;
border: 2px solid rgba(255, 255, 255, 0.3);
background: transparent;
color: white;
border-radius: 25px;
cursor: pointer;
transition: all 0.3s ease;
font-weight: 500;
}

.difficulty-btn.active {
background: rgba(255, 255, 255, 0.2);
border-color: #ffd700;
color: #ffd700;
}

.difficulty-btn:hover {
background: rgba(255, 255, 255, 0.1);
transform: translateY(-2px);
}

/* Game Board */
.game-board {
display: grid;
gap: 15px;
justify-content: center;
margin: 0 auto;
perspective: 1000px;
}

.game-board.grid-4x4 {
grid-template-columns: repeat(4, 1fr);
max-width: 400px;
}

.game-board.grid-5x5 {
grid-template-columns: repeat(5, 1fr);
max-width: 500px;
}

.game-board.grid-6x6 {
grid-template-columns: repeat(6, 1fr);
max-width: 600px;
}

/* Card Styles */
.card {
aspect-ratio: 1;
position: relative;
cursor: pointer;
transform-style: preserve-3d;
transition: transform 0.6s;
}

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

.card.matched {
animation: matchGlow 0.8s ease-out;
}

.card-face {
position: absolute;
width: 100%;
height: 100%;
backface-visibility: hidden;
border-radius: 16px;
display: flex;
justify-content: center;
align-items: center;
font-size: clamp(1.5rem, 3vw, 2.5rem);
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
border: 2px solid rgba(255, 255, 255, 0.1);
}

.card-back {
background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
color: white;
font-weight: 700;
}

.card-back::before {
content: '?';
font-size: clamp(2rem, 4vw, 3rem);
opacity: 0.7;
}

.card-front {
background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
transform: rotateY(180deg);
color: #333;
}

.card:hover {
transform: translateY(-5px) scale(1.05);
}

.card.flipped:hover {
transform: rotateY(180deg) translateY(-5px) scale(1.05);
}

@keyframes matchGlow {

0%,
100% {
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

50% {
box-shadow: 0 0 40px rgba(255, 215, 0, 0.8), 0 0 80px rgba(255, 215, 0, 0.4);
}
}

/* Win Modal */
.win-modal {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.8);
backdrop-filter: blur(10px);
display: flex;
justify-content: center;
align-items: center;
z-index: 1000;
opacity: 0;
pointer-events: none;
transition: all 0.4s ease;
}

.win-modal.show {
opacity: 1;
pointer-events: all;
}

.win-content {
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
padding: 40px;
border-radius: 24px;
text-align: center;
color: white;
box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
border: 2px solid rgba(255, 255, 255, 0.2);
transform: scale(0.8);
transition: transform 0.4s ease;
max-width: 400px;
width: 90%;
}

.win-modal.show .win-content {
transform: scale(1);
}

.win-title {
font-size: 36px;
font-weight: 700;
margin-bottom: 10px;
background: linear-gradient(45deg, #ffd700, #ffed4e);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
}

.win-stats {
margin: 30px 0;
display: flex;
justify-content: space-around;
}

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

.win-stat-value {
font-size: 24px;
font-weight: 700;
color: #ffd700;
}

.win-stat-label {
font-size: 14px;
opacity: 0.8;
margin-top: 5px;
}

#time {
width: 30%;
}

/* Sound Toggle */
.sound-toggle {
position: fixed;
top: 20px;
right: 20px;
background: rgba(255, 255, 255, 0.1);
backdrop-filter: blur(20px);
border: 1px solid rgba(255, 255, 255, 0.2);
color: white;
border-radius: 50%;
width: 50px;
height: 50px;
display: flex;
justify-content: center;
align-items: center;
cursor: pointer;
transition: all 0.3s ease;
font-size: 20px;
}

.sound-toggle:hover {
background: rgba(255, 255, 255, 0.2);
transform: scale(1.1);
}

/* Responsive Design */
@media (max-width: 768px) {
.controls {
flex-direction: column;
text-align: center;
}

.stats {
justify-content: center;
}

.game-board {
gap: 10px;
padding: 0 10px;
}

.card-face {
font-size: 1.5rem;
}

.difficulty-buttons {
gap: 10px;
}

.difficulty-btn {
padding: 8px 16px;
font-size: 14px;
}

.memory-loader {
gap: 10px;
}

.loader-card {
width: 50px;
height: 50px;
}

.loader-card-face {
font-size: 20px;
}
}

@media (max-width: 480px) {
.game-container {
padding: 15px;
}

.controls {
padding: 15px;
}

.game-board {
gap: 8px;
}

.card-face {
font-size: 1.2rem;
}

.memory-loader {
gap: 8px;
}

.loader-card {
width: 40px;
height: 40px;
}
}