:root {
    --primary-color: #0d47a1;
    --secondary-color: #1976d2;
    --accent-color: #ffc107;
    --bg-color: #0a0e14;
    --card-bg: #151b23;
    --text-color: #e6edf3;
    --text-muted: #8b949e;
    --border-color: #30363d;
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-main);
    background: linear-gradient(135deg, #0a0e14 0%, #1a1f2e 100%);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

header {
    background-color: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    background: linear-gradient(45deg, #2196f3, #00bcd4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    display: inline-block;
    margin-bottom: 1rem;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.nav-links a.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

main {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 2rem 4rem;
}

.hero {
    text-align: center;
    padding: 4rem 0 3rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #2196f3, #00bcd4, #4caf50);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {

    0%,
    100% {
        filter: hue-rotate(0deg);
    }

    50% {
        filter: hue-rotate(20deg);
    }
}

.content-section {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-section:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.5);
}

.content-section h1 {
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
    font-size: 2.5rem;
    text-align: center;
}

.content-section h2 {
    margin: 2rem 0 1rem;
    color: var(--secondary-color);
    font-size: 1.8rem;
}

.content-section h3 {
    margin: 1.5rem 0 1rem;
    color: var(--accent-color);
}

.content-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.content-section a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.content-section a:hover {
    color: #ffeb3b;
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

iframe {
    width: 100%;
    min-height: 400px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin: 1rem 0;
}

footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
    background-color: rgba(13, 17, 23, 0.8);
}

@media (max-width: 768px) {
    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .content-section {
        padding: 1.5rem;
    }

    main {
        padding: 0 1rem 2rem;
    }
}