:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --accent: #38bdf8;
    --accent-strong: #0ea5e9;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --card-radius: 18px;
    --max-width: 960px;
    --transition: 0.25s ease;
}

/* Base document styling for consistent typography */
* {
    box-sizing: border-box;
}

/* Enable smooth scrolling for in-page navigation links */
html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    color: var(--text);
    background: radial-gradient(circle at top, #1e3a8a, var(--bg));
    min-height: 100vh;
}

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.hero {
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.1), rgba(14, 165, 233, 0.05));
    padding: 2.5rem 1.5rem 5rem;
}

.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    max-width: var(--max-width);
    margin: 0 auto 3rem;
}

.brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
    letter-spacing: 0.04em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.25rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--muted);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a:focus {
    color: var(--accent);
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: left;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 4vw + 1rem, 4.25rem);
    margin-bottom: 0.75rem;
}

.hero-content p {
    font-size: 1.15rem;
    color: var(--muted);
    margin-bottom: 2rem;
}

.primary-btn,
.secondary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.75rem;
    border-radius: 999px;
    font-weight: 600;
    text-decoration: none;
    transition: transform var(--transition), background var(--transition);
}

.primary-btn {
    background: var(--accent);
    color: var(--bg);
}

.primary-btn:hover,
.primary-btn:focus {
    background: var(--accent-strong);
    transform: translateY(-2px);
}

.secondary-btn {
    border: 1px solid rgba(148, 163, 184, 0.4);
    color: var(--text);
    background: rgba(30, 41, 59, 0.6);
}

.secondary-btn:hover,
.secondary-btn:focus {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

main {
    flex: 1;
    padding: 0 1.5rem 4rem;
}

.card {
    background: rgba(15, 23, 42, 0.75);
    border: 1px solid rgba(148, 163, 184, 0.18);
    border-radius: var(--card-radius);
    padding: 2rem;
    margin: -3rem auto 2rem;
    max-width: var(--max-width);
    backdrop-filter: blur(10px);
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.4);
}

.card h2 {
    margin-top: 0;
    font-size: 1.75rem;
}

.card p {
    color: var(--muted);
    line-height: 1.6;
}

.timeline {
    list-style: none;
    margin: 1.5rem 0 0;
    padding: 0;
    border-left: 2px solid rgba(148, 163, 184, 0.2);
}

.timeline li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 1.75rem;
}

.timeline li::before {
    content: "";
    position: absolute;
    left: -0.65rem;
    top: 0.35rem;
    width: 0.75rem;
    height: 0.75rem;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}

.timeline__meta {
    display: block;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.language-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.language {
    padding: 1.25rem;
    border-radius: 1rem;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.12);
    transition: transform var(--transition), border var(--transition);
}

.language:hover {
    transform: translateY(-4px);
    border-color: rgba(56, 189, 248, 0.35);
}

.project-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.75rem;
}

.project {
    padding: 1.5rem;
    border-radius: 1rem;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.12);
    color: var(--muted);
    line-height: 1.6;
}

.footer {
    text-align: center;
    padding: 2rem 1.5rem 3rem;
    color: var(--muted);
    font-size: 0.95rem;
    border-top: 1px solid rgba(148, 163, 184, 0.12);
    background: rgba(15, 23, 42, 0.85);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.75rem;
    margin-top: 1rem;
}

.footer a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

.footer a:hover,
.footer a:focus {
    color: var(--accent-strong);
}

@media (max-width: 720px) {
    .top-nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    .card {
        margin: -2.5rem auto 2rem;
        padding: 1.75rem;
    }
}