:root {
    --primary: #2c3e50;
    --secondary: #6a11cb;
    --accent: #feb47b;
    --text: #333;
    --light: #f8f9fa;
    --dark: #1a1a1a;
    --gradient: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    --radius: 12px;
    --shadow: 0 10px 30px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.8;
    color: var(--text);
    background: var(--light);
    overflow-x: hidden;
}

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

.header {
    background: var(--gradient);
    color: white;
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 60px;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    opacity: 0.1;
    z-index: 0;
}

.header h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.header p {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.2rem;
    position: relative;
    z-index: 1;
}

.notice {
    background: white;
    padding: 15px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto 40px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--secondary);
    border: 1px solid rgba(106,17,203,0.2);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255,255,255,0.95);
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    z-index: 1000;
    padding: 15px 0;
    backdrop-filter: blur(10px);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s;
    position: relative;
}

.nav-links a:hover {
    color: var(--secondary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary);
    transition: width 0.3s;
}

.nav-links a:hover::after {
    width: 100%;
}

.main-content {
    padding-top: 100px;
}

article {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 50px;
    margin-bottom: 60px;
}

article h2 {
    font-family: 'Montserrat', sans-serif;
    color: var(--primary);
    font-size: 2rem;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
}

article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: var(--gradient);
    border-radius: 2px;
}

article h3 {
    font-family: 'Montserrat', sans-serif;
    color: var(--secondary);
    font-size: 1.5rem;
    margin: 40px 0 20px;
}

article p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.image-card {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.image-card img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s;
}

.image-card:hover img {
    transform: scale(1.05);
}

pre {
    background: #f5f5f5;
    padding: 20px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 30px 0;
    border-left: 4px solid var(--secondary);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

code {
    background: rgba(106,17,203,0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--secondary);
}

.parallax-section {
    height: 400px;
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    margin: 60px 0;
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
}

.parallax-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.3);
}

.parallax-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    text-align: center;
    width: 100%;
    padding: 0 20px;
    z-index: 1;
}

.parallax-content h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 5px rgba(0,0,0,0.5);
}

.footer {
    background: var(--primary);
    color: white;
    padding: 50px 0;
    text-align: center;
}

.footer p {
    margin-bottom: 20px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
}

.footer-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--accent);
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2.2rem;
    }
    
    .nav-links {
        gap: 15px;
    }
    
    article {
        padding: 30px;
    }
    
    .image-grid {
        grid-template-columns: 1fr;
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }