/*
 * © 2025 Dr Michael Guo. All rights reserved.
 * This game and its source code are protected under copyright law.
 */

/* Epic Dark Theme Design System */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    --text-primary: #ffffff;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    
    --bg-primary: rgba(15, 15, 35, 0.95);
    --bg-secondary: rgba(26, 26, 46, 0.9);
    --bg-tertiary: rgba(55, 65, 81, 0.8);
    --bg-elevated: rgba(31, 41, 55, 0.95);
    
    --border-color: rgba(107, 114, 128, 0.3);
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.5);
    
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

/* 🚀 INSANELY COOL BACKGROUND ANIMATIONS */

/* Base body setup for animations */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Arial, sans-serif;
    background: #0f0f23;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Animated Background Container */
.animated-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10;
    overflow: hidden;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 25%, #16213e 50%, #0f0f23 100%);
    animation: backgroundPulse 20s ease-in-out infinite;
}

@keyframes backgroundPulse {
    0%, 100% { 
        background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 25%, #16213e 50%, #0f0f23 100%);
    }
    25% { 
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 25%, #0f0f23 50%, #1a1a2e 100%);
    }
    50% { 
        background: linear-gradient(135deg, #16213e 0%, #0f0f23 25%, #1a1a2e 50%, #16213e 100%);
    }
    75% { 
        background: linear-gradient(135deg, #0f0f23 0%, #16213e 25%, #1a1a2e 50%, #0f0f23 100%);
    }
}

/* 🌟 FLOATING ORBS - EPIC GLOWING SPHERES */
.floating-orbs {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(99, 102, 241, 0.8), rgba(139, 92, 246, 0.6), rgba(236, 72, 153, 0.4));
    filter: blur(1px);
    animation: orbFloat 15s ease-in-out infinite;
    box-shadow: 
        0 0 60px rgba(99, 102, 241, 0.5),
        inset 0 0 30px rgba(255, 255, 255, 0.1);
}

.orb-1 {
    width: 200px;
    height: 200px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
    animation-duration: 20s;
}

.orb-2 {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 15%;
    animation-delay: -5s;
    animation-duration: 25s;
}

.orb-3 {
    width: 120px;
    height: 120px;
    bottom: 20%;
    left: 20%;
    animation-delay: -10s;
    animation-duration: 18s;
}

.orb-4 {
    width: 180px;
    height: 180px;
    top: 30%;
    right: 40%;
    animation-delay: -15s;
    animation-duration: 22s;
}

.orb-5 {
    width: 100px;
    height: 100px;
    bottom: 40%;
    right: 20%;
    animation-delay: -8s;
    animation-duration: 16s;
}

.orb-6 {
    width: 160px;
    height: 160px;
    top: 70%;
    left: 60%;
    animation-delay: -12s;
    animation-duration: 24s;
}

@keyframes orbFloat {
    0%, 100% {
        transform: translate(0, 0) scale(1) rotate(0deg);
        opacity: 0.6;
    }
    25% {
        transform: translate(100px, -80px) scale(1.2) rotate(90deg);
        opacity: 0.8;
    }
    50% {
        transform: translate(-50px, -160px) scale(0.8) rotate(180deg);
        opacity: 0.4;
    }
    75% {
        transform: translate(-120px, -40px) scale(1.1) rotate(270deg);
        opacity: 0.9;
    }
}

/* 🔺 GEOMETRIC SHAPES - FLOATING POLYGONS */
.geometric-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.shape {
    position: absolute;
    animation: shapeFloat 12s linear infinite;
}

.triangle {
    width: 0;
    height: 0;
    border-left: 25px solid transparent;
    border-right: 25px solid transparent;
    border-bottom: 40px solid rgba(245, 158, 11, 0.6);
    top: 20%;
    left: 80%;
    animation-delay: 0s;
    filter: drop-shadow(0 0 20px rgba(245, 158, 11, 0.8));
}

.square {
    width: 40px;
    height: 40px;
    background: rgba(16, 185, 129, 0.6);
    top: 50%;
    left: 10%;
    animation-delay: -3s;
    filter: drop-shadow(0 0 20px rgba(16, 185, 129, 0.8));
}

.circle {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: rgba(239, 68, 68, 0.6);
    top: 80%;
    right: 30%;
    animation-delay: -6s;
    filter: drop-shadow(0 0 20px rgba(239, 68, 68, 0.8));
}

.diamond {
    width: 30px;
    height: 30px;
    background: rgba(168, 85, 247, 0.6);
    transform: rotate(45deg);
    top: 30%;
    left: 50%;
    animation-delay: -9s;
    filter: drop-shadow(0 0 20px rgba(168, 85, 247, 0.8));
}

.hexagon {
    width: 40px;
    height: 34.64px;
    background: rgba(14, 165, 233, 0.6);
    position: relative;
    top: 70%;
    right: 10%;
    animation-delay: -12s;
    filter: drop-shadow(0 0 20px rgba(14, 165, 233, 0.8));
}

.hexagon:before,
.hexagon:after {
    content: "";
    position: absolute;
    width: 0;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
}

.hexagon:before {
    bottom: 100%;
    border-bottom: 11.55px solid rgba(14, 165, 233, 0.6);
}

.hexagon:after {
    top: 100%;
    border-top: 11.55px solid rgba(14, 165, 233, 0.6);
}

@keyframes shapeFloat {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

/* 🌊 GRADIENT WAVES - FLOWING ENERGY */
.gradient-waves {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.wave {
    position: absolute;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, 
        transparent 0%,
        rgba(99, 102, 241, 0.1) 25%,
        rgba(236, 72, 153, 0.1) 50%,
        rgba(245, 158, 11, 0.1) 75%,
        transparent 100%);
    animation: waveFlow 15s linear infinite;
}

.wave-1 {
    top: -50%;
    left: -50%;
    animation-delay: 0s;
    animation-duration: 20s;
}

.wave-2 {
    top: -50%;
    right: -50%;
    animation-delay: -7s;
    animation-duration: 25s;
    animation-direction: reverse;
}

.wave-3 {
    bottom: -50%;
    left: -50%;
    animation-delay: -14s;
    animation-duration: 18s;
}

@keyframes waveFlow {
    0% {
        transform: rotate(0deg) scale(0.8);
        opacity: 0.3;
    }
    50% {
        transform: rotate(180deg) scale(1.2);
        opacity: 0.6;
    }
    100% {
        transform: rotate(360deg) scale(0.8);
        opacity: 0.3;
    }
}

/* 💫 PARTICLE SYSTEM - MAGICAL DOTS */
.particles-container {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: #6366f1;
    border-radius: 50%;
    opacity: 0.7;
    animation: particleMove 10s linear infinite;
    box-shadow: 0 0 10px currentColor;
}

@keyframes particleMove {
    0% {
        transform: translateY(100vh) translateX(0) scale(0);
        opacity: 0;
    }
    10% {
        opacity: 0.7;
        transform: scale(1);
    }
    90% {
        opacity: 0.7;
    }
    100% {
        transform: translateY(-100px) translateX(100px) scale(0);
        opacity: 0;
    }
}

/* 🔢 MATRIX RAIN EFFECT - CYBER VIBES */
.matrix-rain {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    opacity: 0.3;
}

.matrix-char {
    position: absolute;
    color: #00ff41;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    font-weight: bold;
    text-shadow: 0 0 10px #00ff41;
    animation: matrixFall 3s linear infinite;
}

@keyframes matrixFall {
    0% {
        transform: translateY(-100px);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh);
        opacity: 0;
    }
}

/* 💎 ENHANCED APP CONTAINER */
.app {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    backdrop-filter: blur(0.5px);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    padding: 60px 0 40px;
    text-align: center;
    background: var(--bg-primary);
    box-shadow: var(--shadow-light);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    pointer-events: none;
}

.title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
    position: relative;
    text-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 400;
    position: relative;
}

/* Main Content */
.main {
    flex: 1;
    padding: 40px 0 60px;
    background: rgba(15, 15, 35, 0.3);
    backdrop-filter: blur(5px);
}

/* Game Stats */
.game-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-elevated);
    padding: 20px 24px;
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    min-width: 100px;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

/* Level Selector */
.level-selector {
    text-align: center;
    margin-bottom: 40px;
}

.level-selector h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 32px;
    color: var(--text-primary);
    text-shadow: 0 0 20px rgba(99, 102, 241, 0.6);
    background: linear-gradient(135deg, #ffffff 0%, #d1d5db 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.level-selector h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.level-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}

.level-btn {
    background: var(--bg-elevated);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-large);
    padding: 32px 24px;
    cursor: pointer;
    transition: all var(--transition-medium);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-light);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.level-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(236, 72, 153, 0.05) 100%);
    pointer-events: none;
    transition: opacity var(--transition-fast);
    opacity: 0;
}

.level-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.3);
}

.level-btn:hover::before {
    opacity: 1;
}

.level-btn:active {
    transform: translateY(-2px);
}

.level-number {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.level-cards {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.level-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.level-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Game Board */
.game-board {
    display: none;
}

.game-board.active {
    display: block;
}

.board-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 16px;
    background: var(--bg-elevated);
    padding: 20px;
    border-radius: var(--radius-large);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
}

.back-btn, .restart-btn {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-medium);
    padding: 12px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.back-btn:hover, .restart-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

/* Cards Container */
.cards-container {
    display: grid;
    gap: 20px;
    justify-content: center;
    margin: 0 auto;
    max-width: 1000px;
}

.cards-container.level-1 {
    grid-template-columns: repeat(2, 1fr);
    max-width: 600px;
}

.cards-container.level-2 {
    grid-template-columns: repeat(3, 1fr);
    max-width: 750px;
}

.cards-container.level-3 {
    grid-template-columns: repeat(4, 1fr);
    max-width: 900px;
}

.cards-container.level-4 {
    grid-template-columns: repeat(5, 1fr);
    max-width: 1000px;
}

/* Memory Cards */
.memory-card {
    width: 100%;
    height: 160px;
    perspective: 1000px;
    cursor: pointer;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform var(--transition-medium);
    transform-style: preserve-3d;
    border-radius: var(--radius-medium);
}

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

.memory-card.matched .card-inner {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.card-front {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    font-size: 2rem;
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.card-back {
    background: var(--bg-elevated);
    transform: rotateY(180deg);
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.4;
    border: 1px solid var(--primary-color);
}

.memory-card:hover .card-inner {
    transform: translateY(-2px) rotateY(0deg);
}

.memory-card.flipped:hover .card-inner,
.memory-card.matched:hover .card-inner {
    transform: translateY(-2px) rotateY(180deg);
}

.memory-card.matched .card-front,
.memory-card.matched .card-back {
    border-color: var(--success-color);
    box-shadow: 0 0 0 2px var(--success-color), var(--shadow-medium);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 48px 32px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-heavy);
    border: 1px solid var(--border-color);
    animation: modalSlideIn var(--transition-medium);
    backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    pointer-events: none;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.success-icon {
    font-size: 4rem;
    margin-bottom: 24px;
}

.modal-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
    text-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
    position: relative;
    z-index: 1;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 1rem;
    position: relative;
    z-index: 1;
}

.modal-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 32px;
    position: relative;
    z-index: 1;
}

.modal-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.modal-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.modal-stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.modal-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-medium);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 120px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    border-color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.2);
}

/* 🖱️ MOUSE INTERACTION ANIMATIONS */
@keyframes mouseParticle {
    0% {
        opacity: 1;
        transform: scale(1);
    }
    100% {
        opacity: 0;
        transform: scale(0) translateY(-50px);
    }
}

@keyframes explode {
    0% {
        opacity: 1;
        transform: scale(1) translate(0, 0);
    }
    100% {
        opacity: 0;
        transform: scale(0) translate(var(--dx), var(--dy));
    }
}

/* Enhanced orb hover effects */
.orb:hover {
    transform: scale(1.1);
    filter: blur(0.5px) brightness(1.2);
    box-shadow: 
        0 0 80px rgba(99, 102, 241, 0.8),
        inset 0 0 40px rgba(255, 255, 255, 0.2);
}

/* Footer */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 10px 0;
    text-align: center;
    z-index: 1000;
}

.footer p {
    margin: 0;
    color: var(--text-primary);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 40px 0 30px;
    }
    
    .title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.125rem;
    }
    
    .game-stats {
        gap: 16px;
    }
    
    .stat-item {
        padding: 16px 20px;
        min-width: 80px;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
    
    .level-buttons {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .level-btn {
        padding: 24px 20px;
    }
    
    .cards-container.level-1 {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    
    .cards-container.level-2 {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .cards-container.level-3 {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .cards-container.level-4 {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .memory-card {
        height: 140px;
    }
    
    .card-back {
        font-size: 0.75rem;
        padding: 12px;
    }
    
    .modal-content {
        padding: 32px 24px;
    }
    
    .modal-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .board-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .back-btn, .restart-btn {
        width: 100%;
        justify-content: center;
    }
}