:root {
    --bg: #0b0b0b;
    --surface: #141414;
    --fg: #fafafa;
    --muted: #a3a3a3;
    --border: #262626;
    --accent: #ffffff;
    --accent-fg: #0b0b0b;
    --radius: 10px;
    --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
}

/* ---- Nav ---- */
.nav {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2rem;
    background: rgba(11, 11, 11, 0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.nav-brand {
    font-family: var(--font-mono);
    font-weight: 600;
    text-decoration: none;
    font-size: 1.05rem;
    color: var(--fg);
}

.nav-brand span {
    color: var(--muted);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--muted);
    font-size: 0.9rem;
    transition: color 0.15s ease;
}

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

/* ---- Hero ---- */
.hero {
    max-width: 44rem;
    margin: 0 auto;
    padding: 6rem 2rem 4rem;
    text-align: left;
}

.hero-eyebrow {
    font-family: var(--font-mono);
    color: var(--muted);
    margin: 0 0 0.5rem;
    font-size: 0.95rem;
}

.hero h1 {
    font-size: clamp(2.25rem, 6vw, 3.5rem);
    letter-spacing: -0.02em;
    margin: 0 0 0.75rem;
}

.hero-tagline {
    color: var(--muted);
    font-size: 1.15rem;
    line-height: 1.6;
    margin: 0 0 2rem;
    max-width: 34rem;
}

.hero-actions {
    display: flex;
    gap: 0.85rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.65rem 1.35rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    border: 1px solid var(--border);
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

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

.btn-primary:hover {
    background: #e6e6e6;
}

.btn-ghost {
    color: var(--fg);
}

.btn-ghost:hover {
    border-color: var(--fg);
}

/* ---- Sections ---- */
.section {
    max-width: 64rem;
    margin: 0 auto;
    padding: 3.5rem 2rem;
    border-top: 1px solid var(--border);
}

.section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    letter-spacing: -0.01em;
    margin: 0 0 2rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.15rem 0.5rem;
}

/* ---- Project grid ---- */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
    gap: 1.25rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: transform 0.18s ease, border-color 0.18s ease;
}

.card:hover {
    transform: translateY(-3px);
    border-color: #3a3a3a;
}

.card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
}

.card-head h3 {
    margin: 0;
    font-size: 1.1rem;
    font-family: var(--font-mono);
}

.lang {
    font-size: 0.75rem;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    color: var(--muted);
    white-space: nowrap;
}

.lang-rust { color: #f5a97f; border-color: #4a3a2e; }
.lang-php { color: #8a9ffb; border-color: #33355c; }
.lang-ts { color: #5fb0e0; border-color: #29455a; }
.lang-js { color: #e0d05f; border-color: #52502a; }

.card p {
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.55;
    margin: 0 0 1.1rem;
}

.card-links {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.88rem;
}

.card-links a {
    text-decoration: none;
    color: var(--fg);
    border-bottom: 1px solid var(--border);
}

.card-links a:hover {
    border-color: var(--fg);
}

.stars {
    color: var(--muted);
    font-size: 0.85rem;
    margin-left: auto;
}

/* ---- About ---- */
.about-body p {
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.7;
    max-width: 46rem;
    margin: 0 0 1.1rem;
}

/* ---- Skills ---- */
.skills-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 0;
    margin: 0;
}

.skills-list li {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.5rem 1.1rem;
    color: var(--fg);
}

/* ---- Footer ---- */
.footer {
    max-width: 64rem;
    margin: 0 auto;
    padding: 3rem 2rem 4rem;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--muted);
}

.footer a {
    color: var(--fg);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
}

.footer a:hover {
    border-color: var(--fg);
}

.footer-github {
    display: inline-block;
    margin-top: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
    .nav {
        padding: 1rem 1.25rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .hero {
        padding: 4rem 1.25rem 3rem;
    }

    .section {
        padding: 2.5rem 1.25rem;
    }
}