:root {
    /* Color Palette: Midnight & Gold */
    --bg-color: #0a192f;
    --card-bg: #112240;
    --text-primary: #e6f1ff;
    --text-secondary: #8892b0;
    --accent-gold: #ffd700;
    --accent-gold-muted: #b29758;
    --font-main: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --container-width: 1000px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-secondary);
    font-family: var(--font-main);
    line-height: 1.6;
    font-size: 16px;
}

h1, h2, h3 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: 3rem; margin-bottom: 1rem; }
h2 { font-size: 2rem; margin-bottom: 2rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }

a {
    text-decoration: none;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-gold);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.site-header {
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    background-color: rgba(10, 25, 47, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid rgba(178, 151, 88, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    text-decoration: none;
    display: inline-block;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    letter-spacing: -1px;
}

.cursor {
    color: var(--accent-gold);
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

nav a {
    margin-left: var(--spacing-md);
    font-size: 0.9rem;
    font-family: var(--font-mono);
}

/* Hero Section */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-lg) 0;
}

.overline {
    color: var(--accent-gold);
    font-family: var(--font-mono);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.hero h1 {
    font-size: clamp(40px, 8vw, 70px);
}

.highlight {
    color: var(--accent-gold);
}

.subtitle {
    max-width: 600px;
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
}

.actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: transparent;
    border: 1px solid var(--accent-gold);
    color: var(--accent-gold);
}

.btn-primary:hover {
    background-color: rgba(255, 215, 0, 0.1);
}

.btn-secondary {
    color: var(--text-primary);
}

.btn-secondary:hover {
    text-decoration: underline;
    text-decoration-color: var(--accent-gold);
}

/* Stack Section */
.stack-section {
    padding: var(--spacing-lg) 0;
}

.section-title {
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.section-title::after {
    content: "";
    display: block;
    width: 200px;
    height: 1px;
    background-color: var(--accent-gold-muted);
    margin-left: var(--spacing-sm);
    opacity: 0.5;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.card {
    background-color: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: 4px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
}

.card .icon {
    font-family: var(--font-mono);
    color: var(--accent-gold);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

/* Research Section */
.research-section {
    padding: var(--spacing-lg) 0;
}

.research-content {
    margin-top: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.research-topic {
    background-color: var(--card-bg);
    padding: var(--spacing-md);
    border-left: 3px solid var(--accent-gold);
}

/* Contact Section */
.contact-section {
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.link-highlight {
    display: inline-block;
    margin-top: var(--spacing-sm);
    color: var(--accent-gold);
    font-weight: 700;
    font-size: 1.2rem;
}

/* Footer */
footer {
    padding: var(--spacing-md) 0;
    text-align: center;
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .site-header {
        padding: var(--spacing-sm) 0;
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    nav {
        display: flex;
        justify-content: center;
        width: 100%;
    }

    nav a {
        margin: 0 0.75rem;
        font-size: 0.8rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .grid {
        grid-template-columns: 1fr;
    }
}