:root {
    --primary-color: #00ffff; /* Cyan */
    --secondary-color: #ff00ff; /* Magenta */
    --accent-color: #ffff00; /* Yellow */
    --background-color: #121212; /* Very dark gray */
    --surface-color: #1e1e1e; /* Dark gray */
    --on-surface-color: #ffffff; /* White text */
    --muted-color: #a0a0a0; /* Light gray */
    --beginner-color: #4CAF50; /* Green */
    --intermediate-color: #FFC107; /* Yellow */
    --advanced-color: #F44336; /* Red */
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--on-surface-color);
    line-height: 1.6;
}

header {
    background-color: var(--surface-color);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: flex-end;
}

nav a {
    color: var(--primary-color);
    text-decoration: none;
    margin-left: 1rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

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

main {
    padding: 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.ai-zone {
    background-image: url('../assets/multimodal.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-color: var(--surface-color);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.ai-zone::before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.5);
    border-radius: 20px;
    z-index: 1;
}

.ai-zone > * {
    position: relative;
    z-index: 2;
}

.ai-zone:hover {
    transform: translateY(-10px);
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.4);
}

.ai-zone h1 {
    color: var(--primary-color);
    font-size: 2.5em;
    margin-bottom: 1rem;
    text-shadow: 0 0 10px var(--primary-color);
}

.ai-zone h2 {
    color: var(--secondary-color);
    font-size: 1.8em;
    margin-bottom: 1rem;
    text-shadow: 0 0 8px var(--secondary-color);
}


section {
    background-color: var(--surface-color);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.2);
}

section h2 {
    color: var(--accent-color);
    font-size: 2em;
    margin-bottom: 1rem;
    text-shadow: 0 0 5px var(--accent-color);
    text-align: center; /* Center-align section headings */
}

.item {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.item-footer {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-top: 1rem;
}

.explore-more, .learn-more {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.difficulty-level {
    margin-top: 1rem;
}

.difficulty-btn {
    padding: 5px 10px;
    border: none;
    border-radius: 5px;
    color: var(--on-surface-color);
    font-weight: bold;
    cursor: default;
}

.difficulty-btn[data-difficulty="beginner"] {
    background-color: var(--beginner-color);
}

.difficulty-btn[data-difficulty="intermediate"] {
    background-color: var(--intermediate-color);
}

.difficulty-btn[data-difficulty="advanced"] {
    background-color: var(--advanced-color);
}

.disclaimer {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 1rem;
    margin-top: 2rem;
}

.disclaimer h2 {
    font-size: 1.5em;
    margin-bottom: 0.5rem;
}

.disclaimer p {
    font-size: 0.9em;
    color: var(--muted-color);
}


footer {
    background-color: var(--surface-color);
    color: var(--muted-color);
    padding: 1rem;
    text-align: center;
    margin-top: 2rem;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
    100% {
        transform: translateY(0px);
    }
}

.floating {
    animation: float 6s ease-in-out infinite;
}

@media (max-width: 768px) {
    .item-footer {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .impact-meter {
        margin-top: 0.5rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }
    
    .newsletter-header h1 {
        font-size: 2em;
    }
    
    .newsletter-header h2 {
        font-size: 1.5em;
    }

    .ai-zone h1 {
        font-size: 2em;
    }

    .ai-zone h2 {
        font-size: 1.5em;
    }
}