@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@600;700&family=Inter:wght@400;500&display=swap');

:root {
    --color-dark-blue: #0A1F44;
    --color-dark-purple: #2C0E8C;
    --color-bright-cyan: #00FFD1;
    --color-neon-green: #39FF14;
    --color-light-gray: #F5F7FA;
    --color-white: #FFFFFF;
    --font-title: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--color-dark-blue), var(--color-dark-purple));
    color: var(--color-white);
    line-height: 1.6;
    padding: 20px;
}

h1, h2, h3, h4 {
    font-family: var(--font-title);
    color: var(--color-bright-cyan);
    margin-bottom: 20px;
}

h1 {
    font-size: 3rem;
    text-align: center;
    margin-top: 50px;
}

h2 {
    font-size: 2.5rem;
    margin-top: 40px;
}

h3 {
    font-size: 2rem;
    margin-top: 30px;
}

h4 {
    font-size: 1.5rem;
    margin-top: 25px;
}

p {
    font-size: 1rem;
    margin-bottom: 20px;
}

pre {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
}

code {
    font-family: 'Courier New', Courier, monospace;
    color: var(--color-bright-cyan);
}

.container {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 50px 20px;
}

.item-span-12 {
    grid-column: span 12;
}

.item-span-6 {
    grid-column: span 6;
}

.item-span-4 {
    grid-column: span 4;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-dark-purple);
    color: var(--color-white);
    padding: 15px 30px;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar a {
    color: var(--color-bright-cyan);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
}

.navbar a[rel="nofollow"] {
    /* No additional styling needed */
}

.hero {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--color-dark-purple), var(--color-neon-green));
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center;
    background-size: cover;
    opacity: 0.2;
    z-index: -1;
}

.hero h1 {
    font-size: 4rem;
    color: var(--color-white);
    text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
}

.section {
    padding: 60px 20px;
    background: var(--color-light-gray);
    color: var(--color-dark-blue);
}

.section:nth-child(even) {
    background: var(--color-dark-blue);
    color: var(--color-white);
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    color: var(--color-dark-purple);
}

.section p {
    max-width: 800px;
    margin: 0 auto 20px auto;
    text-align: justify;
}

.image-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

.image-grid img {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: 10px;
}

.button {
    background-color: var(--color-dark-purple);
    color: var(--color-white);
    border: none;
    padding: 12px 25px;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
    margin-top: 20px;
}

.button:hover {
    background-color: var(--color-bright-cyan);
    transform: scale(1.05);
}

.card {
    background-color: var(--color-dark-purple);
    padding: 20px;
    border-radius: 10px;
    perspective: 1000px;
    cursor: pointer;
    transition: transform 0.6s;
}

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

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
}

.card-front {
    background-color: var(--color-dark-purple);
    color: var(--color-white);
}

.card-back {
    background-color: var(--color-bright-cyan);
    color: var(--color-dark-blue);
    transform: rotateY(180deg);
}

.code-block {
    background-color: rgba(0, 255, 209, 0.1);
    padding: 15px;
    border-left: 5px solid var(--color-bright-cyan);
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
}

.footer {
    text-align: center;
    padding: 30px 20px;
    background: var(--color-dark-purple);
    color: var(--color-white);
    position: relative;
}

.footer p {
    font-size: 1rem;
}

@media (max-width: 1440px) {
    .hero h1 {
        font-size: 3.5rem;
    }
}

@media (max-width: 1200px) {
    .container {
        padding: 40px 15px;
    }
}

@media (max-width: 1024px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .navbar a {
        margin-left: 0;
        margin-top: 10px;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .container {
        grid-template-columns: repeat(6, 1fr);
    }
    .item-span-6 {
        grid-column: span 6;
    }
    .item-span-4 {
        grid-column: span 6;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    h2 {
        font-size: 1.75rem;
    }
    h3 {
        font-size: 1.5rem;
    }
    h4 {
        font-size: 1.25rem;
    }
    .container {
        grid-template-columns: repeat(2, 1fr);
    }
    .item-span-12, .item-span-6, .item-span-4 {
        grid-column: span 2;
    }
}

@media (max-width: 320px) {
    body {
        padding: 10px;
    }
    .hero h1 {
        font-size: 1.5rem;
    }
}