:root {
    --bg-color: #0b0f19;
    --card-bg: #111827;
    --card-border: #1f2937;
    --accent-tech: #38bdf8;
    --accent-thoughts: #c084fc;
    --accent-contact: #34d399;
    --text-color: #f3f4f6;
    --text-muted: #9ca3af;
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* Top Navigation Header */
header.site-header {
    background: rgba(11, 15, 25, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--card-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.15rem;
    font-weight: bold;
    color: var(--text-color);
    text-decoration: none;
}

nav {
    display: flex;
    gap: 1rem;
}

.nav-tab {
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.nav-tab:hover, .nav-tab.active {
    color: var(--text-color);
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
}

/* Page Layout */
.page-section {
    min-height: calc(100vh - 130px);
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 1rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.hero h1 {
    font-size: 2.75rem;
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
}

.portal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    text-align: left;
    width: 100%;
}

.portal-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 2.5rem;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.portal-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 30px -10px rgba(0,0,0,0.5);
}

.portal-card.tech:hover { border-color: var(--accent-tech); }
.portal-card.tech .card-title { color: var(--accent-tech); }

.portal-card.philosophy:hover { border-color: var(--accent-thoughts); }
.portal-card.philosophy .card-title { color: var(--accent-thoughts); }

.card-content h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.card-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.card-action {
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.portal-card.tech .card-action { color: var(--accent-tech); }
.portal-card.philosophy .card-action { color: var(--accent-thoughts); }

/* Contact Section Specific Styles */
.contact-box {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 3rem;
    width: 100%;
    max-width: 600px;
    text-align: center;
}

.contact-box h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-contact);
}

.contact-box p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.email-display {
    background-color: var(--bg-color);
    border: 1px solid var(--card-border);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    font-family: monospace;
    font-size: 1.1rem;
    color: var(--text-color);
    display: inline-block;
    margin-bottom: 2rem;
    user-select: all;
}

.btn-contact {
    display: block;
    background-color: var(--accent-contact);
    color: var(--bg-color);
    padding: 0.85rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.2s;
}

.btn-contact:hover {
    opacity: 0.9;
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 2rem;
    border-top: 1px solid var(--card-border);
}

@media (max-width: 768px) {
    header.site-header {
        flex-direction: column;
        gap: 1rem;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
}