:root {
    --bg: #111111;
    --surface: #181818;
    --text: #e2e2e2;
    --muted: #666;
    --border: #242424;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ─── NAV ─── */

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.8rem 4rem;
    border-bottom: 1px solid var(--border);
}

.nav-name {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.85rem;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

/* ─── DESKTOP LAYOUT ─── */

/* Hero: full width, 2 columns */
header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: end;
    padding: 6rem 4rem 5rem;
    border-bottom: 1px solid var(--border);
}

.hero-left { }

.hero-right {
    padding-bottom: 0.4rem;
}

h1 {
    font-size: clamp(2.4rem, 4vw, 3.8rem);
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 0;
}

h1 em {
    font-style: italic;
    font-weight: 300;
}

.tagline {
    font-size: 1rem;
    color: var(--muted);
    font-weight: 300;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.cta {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--bg);
    background: var(--text);
    text-decoration: none;
    padding: 0.65rem 1.4rem;
    border-radius: 4px;
    transition: opacity 0.2s;
}

.cta:hover { opacity: 0.8; }

/* ─── MAIN CONTENT AREA ─── */

.content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    padding: 0 4rem;
}

/* Left column */
.col-left {
    padding: 4rem 4rem 4rem 0;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

/* Right column */
.col-right {
    padding: 4rem 0 4rem 4rem;
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

/* ─── SECTION TITLES ─── */

h2 {
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    margin-bottom: 2rem;
}

/* ─── SERVICES ─── */

.service-list {
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
}

.service-title {
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 0.3rem;
}

.service-desc {
    font-size: 0.88rem;
    color: var(--muted);
    font-weight: 300;
    line-height: 1.7;
}

/* ─── PROJECTS ─── */

.projects {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.project {
    display: block;
    padding: 1.4rem 0;
    text-decoration: none;
    color: inherit;
    border-top: 1px solid var(--border);
    transition: padding-left 0.2s;
}

.project:last-child {
    border-bottom: 1px solid var(--border);
}

.project:hover { padding-left: 0.5rem; }

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.4rem;
}

.project-name {
    font-size: 0.95rem;
    font-weight: 500;
}

.project-arrow {
    font-size: 0.8rem;
    color: var(--muted);
}

.project p {
    font-size: 0.88rem;
    color: var(--muted);
    font-weight: 300;
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.project-stack {
    font-size: 0.75rem;
    color: var(--muted);
    opacity: 0.6;
}

/* ─── TOOLS / SKILLS ─── */

.skills-grid {
    display: flex;
    flex-direction: column;
    gap: 1.4rem;
}

.skill-group-title {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.2rem;
}

.skill-group p:last-child {
    font-size: 0.85rem;
    color: var(--muted);
    font-weight: 300;
    line-height: 1.7;
}

/* ─── LAB CALLOUT ─── */

.lab-callout {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, background 0.2s;
}

.lab-callout:hover {
    background: #181818;
    border-color: #333;
}

.lab-callout-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
}

.lab-callout p {
    font-size: 0.88rem;
    color: var(--muted);
    font-weight: 300;
    line-height: 1.6;
}

.lab-callout-link {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
}

/* ─── CONTACT ─── */

.contact p {
    font-size: 0.95rem;
    color: var(--muted);
    font-weight: 300;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.email-link {
    display: inline-block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 2px;
    margin-bottom: 1.5rem;
    transition: border-color 0.2s;
}

.email-link:hover { border-color: var(--muted); }

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    font-size: 0.85rem;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.social-links a:hover { color: var(--text); }

/* ─── FOOTER ─── */

footer {
    padding: 1.5rem 4rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--muted);
    display: flex;
    justify-content: space-between;
}

/* ─── TABLET ─── */

@media (max-width: 900px) {
    nav { padding: 1.5rem 2rem; }

    header {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 4rem 2rem;
    }

    .content {
        grid-template-columns: 1fr;
        padding: 0 2rem;
    }

    .col-left {
        padding: 3rem 0;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .col-right { padding: 3rem 0; }

    footer { padding: 1.5rem 2rem; }
}

/* ─── MOBILE ─── */

@media (max-width: 520px) {
    nav {
        padding: 1.2rem 1.2rem;
    }

    .nav-links { gap: 1.2rem; }

    header { padding: 3rem 1.2rem; }

    h1 { font-size: 2.2rem; }

    .content { padding: 0 1.2rem; }

    footer {
        padding: 1.5rem 1.2rem;
        flex-direction: column;
        gap: 0.3rem;
    }

    .social-links { flex-wrap: wrap; gap: 1rem; }
}