:root {
    --dark-navy: #0a192f;
    --navy: #112240;
    --light-navy: #233554;
    --slate: #a8b2d1;
    --light-slate: #ccd6f6;
    --lightest-slate: #e6f1ff;
    --white: #e6f1ff;
    --blue: #64ffda;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;
}

body {
    background-color: var(--dark-navy);
    color: var(--slate);
    font-family: var(--font-sans);
    margin: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.site-header {
    background-color: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    padding: 0 40px;
    border-bottom: 1px solid var(--light-navy);
    position: sticky;
    top: 0;
    z-index: 10;
    transition: top 0.3s;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    height: 80px;
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.5em;
    font-weight: 600;
    color: var(--blue);
}

.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 25px;
}

.nav-links a {
    color: var(--lightest-slate);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 600;
    position: relative;
    padding-bottom: 5px;
}

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

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

.hero {
    padding: 80px 20px;
    text-align: center;
}

.hero h1 {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    color: var(--lightest-slate);
    margin: 0 0 10px;
    letter-spacing: -1px;
}

.hero .subtitle {
    font-size: 1.2rem;
    color: var(--light-slate);
    margin: 0 0 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-details {
    display: flex;
    justify-content: center;
    gap: 30px;
    color: var(--slate);
    font-size: 1.1rem;
}

.hero-details span {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Main Content */
.card {
    background-color: var(--navy);
    border-radius: 8px;
    padding: 40px;
    margin-bottom: 30px;
    border: 1px solid var(--light-navy);
    box-shadow: 0 10px 30px -15px rgba(2,12,27,0.7);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeIn 0.6s forwards;
    animation-play-state: paused;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 30px -15px rgba(2,12,27,0.7);
}

.content-section h2 {
    font-family: var(--font-mono);
    font-size: 2rem;
    color: var(--lightest-slate);
    margin-top: 0;
    position: relative;
    padding-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-section h2::before {
    content: '#';
    color: var(--blue);
    font-size: 1.8rem;
}

.content-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, var(--light-navy), transparent);
}

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

.topics-list {
    columns: 2;
    padding-left: 0;
    list-style-type: none;
}

.topics-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
}

.topics-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--blue);
}

.cta-button {
    display: inline-block;
    background-color: transparent;
    color: var(--blue);
    padding: 12px 24px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
    border: 1px solid var(--blue);
}

.cta-button:hover {
    background-color: rgba(100, 255, 218, 0.1);
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 20px;
    color: var(--slate);
    border-top: 1px solid var(--light-navy);
    margin-top: 40px;
}

/* Hamburger Menu */
.hamburger {
    display: block;
    cursor: pointer;
}

.hamburger .bar {
    width: 25px;
    height: 3px;
    background-color: var(--lightest-slate);
    margin: 5px 0;
    transition: 0.4s;
}

/* Animations */
@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .nav-links {
        position: fixed;
        left: -100%;
        top: 80px;
        gap: 0;
        flex-direction: column;
        background-color: var(--dark-navy);
        width: 100%;
        text-align: center;
        transition: 0.3s;
    }

    .nav-links.active {
        left: 0;
    }

    .nav-links li {
        padding: 15px 0;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero .subtitle {
        font-size: 1.1rem;
    }

    .people-grid {
        grid-template-columns: 1fr;
    }

    .topics-list {
        columns: 1;
    }
}

@media (min-width: 769px) {
    .nav-links {
        display: flex;
    }

    .hamburger {
        display: none;
    }
}