:root {
    --bg-color: #0a0a0a;
    --text-color: #e0e0e0;
    --accent-color: #4a90e2;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
}

.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 50% 50%, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    animation: float 15s ease-in-out infinite alternate;
    opacity: 0.7;
}

@keyframes float {
    0% { transform: scale(1) translate(0, 0); }
    100% { transform: scale(1.1) translate(2%, 3%); }
}

header {
    text-align: center;
    padding: 2rem 0;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

header h1 {
    margin: 0;
    font-size: 3rem;
    letter-spacing: 5px;
    text-transform: uppercase;
}

nav {
    margin-top: 1.5rem;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 30px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: bold;
    padding: 5px 10px;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--accent-color);
}

main {
    height: calc(100vh - 200px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 10%;
    text-align: center;
}

.content-section {
    display: none;
    animation: fadeIn 0.8s ease-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

section p {
    font-size: 1.2rem;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
}