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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    position: relative;
    z-index: 2;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(rgba(102, 126, 234, 0.8), rgba(118, 75, 162, 0.8)),
                url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,32L48,80C96,128,192,224,288,224C384,224,480,128,576,90.7C672,53,768,75,864,96C960,117,1056,139,1152,122.7C1248,107,1344,53,1392,26.7L1440,0L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') center/cover;
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.main-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 1s ease-out;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    color: #f0f8ff;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.wave-decoration {
    font-size: 3rem;
    animation: wave 2s ease-in-out infinite;
}

/* Language Selection */
.language-selection {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.selection-container {
    text-align: center;
}

.selection-title {
    font-size: 2.5rem;
    font-weight: 600;
    color: white;
    margin-bottom: 1rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.selection-subtitle {
    font-size: 1.1rem;
    color: #f0f8ff;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.language-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.language-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 3rem 2rem;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.language-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.language-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s ease;
}

.language-card:hover::before {
    left: 100%;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: bounce 2s ease-in-out infinite;
}

.chinese-card .card-icon {
    animation-delay: 0s;
}

.english-card .card-icon {
    animation-delay: 0.5s;
}

.language-card h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.language-card p {
    font-size: 1rem;
    color: #7f8c8d;
    margin-bottom: 1.5rem;
}

.card-arrow {
    font-size: 1.5rem;
    color: #667eea;
    font-weight: bold;
    transition: transform 0.3s ease;
}

.language-card:hover .card-arrow {
    transform: translateX(5px);
}

/* Footer */
.footer {
    padding: 2rem;
    text-align: center;
    background: rgba(0, 0, 0, 0.1);
}

.footer-content p {
    color: white;
    font-size: 1rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.social-icons span {
    font-size: 1.5rem;
    animation: float 3s ease-in-out infinite;
}

.social-icons span:nth-child(1) { animation-delay: 0s; }
.social-icons span:nth-child(2) { animation-delay: 0.5s; }
.social-icons span:nth-child(3) { animation-delay: 1s; }

/* Background Elements */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.floating-element {
    position: absolute;
    font-size: 2rem;
    opacity: 0.3;
    animation: floatAround 15s ease-in-out infinite;
}

.element-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.element-2 {
    top: 60%;
    right: 10%;
    animation-delay: 3s;
}

.element-3 {
    top: 80%;
    left: 20%;
    animation-delay: 6s;
}

.element-4 {
    top: 40%;
    right: 20%;
    animation-delay: 9s;
}

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

@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(20deg); }
    75% { transform: rotate(-20deg); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes floatAround {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(30px, -30px) rotate(90deg); }
    50% { transform: translate(-20px, 20px) rotate(180deg); }
    75% { transform: translate(20px, 30px) rotate(270deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.2rem;
    }
    
    .selection-title {
        font-size: 2rem;
    }
    
    .language-cards {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .language-card {
        padding: 2rem 1.5rem;
    }
    
    .hero-section {
        padding: 3rem 1rem;
    }
    
    .language-selection {
        padding: 3rem 1rem;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .selection-title {
        font-size: 1.5rem;
    }
    
    .language-card h3 {
        font-size: 1.5rem;
    }
}