:root {
    --bg: #fbfaf8;
    --surface: #ffffff;
    --text: #1f2328;
    --muted: #5b6470;
    --border: #e6e3de;
    --link: #2f6fb3;
    --shadow: 0 1px 2px rgba(20, 20, 20, .04), 0 8px 24px rgba(20, 20, 20, .06);
    --radius: 14px;
    --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111316;
        --surface: #181b20;
        --text: #e6e8eb;
        --muted: #9aa3ad;
        --border: #2a2f36;
        --link: #7fb2ec;
        --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font);
    font-size: 17px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Hero ---------- */

.hero {
    padding: 88px 0 56px;
    border-bottom: 1px solid var(--border);
}

.mark {
    display: block;
    width: 150px;
    height: auto;
    margin-bottom: 24px;
}

.hero h1 {
    margin: 0;
    font-family: var(--mono);
    font-size: clamp(2.4rem, 6vw, 3.6rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.roles {
    margin: 12px 0 28px;
    font-size: 1.15rem;
    color: var(--muted);
}

.roles b { color: var(--text); font-weight: 600; }

.intro {
    max-width: 680px;
    margin: 0 0 28px;
    font-size: 1.08rem;
}

.intro p { margin: 0 0 14px; }

.links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: .95rem;
    font-weight: 500;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    transition: border-color .15s, transform .15s;
}

.btn:hover {
    text-decoration: none;
    border-color: var(--muted);
    transform: translateY(-1px);
}

.btn svg { width: 18px; height: 18px; fill: currentColor; }

/* ---------- Projects ---------- */

.projects { padding: 56px 0 24px; }

.section-title {
    margin: 0 0 8px;
    font-size: 1.6rem;
    letter-spacing: -0.01em;
}

.section-lead {
    margin: 0 0 32px;
    color: var(--muted);
    max-width: 720px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 460px), 1fr));
    gap: 20px;
}

.card {
    display: flex;
    flex-direction: column;
    padding: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform .2s, box-shadow .2s;
}

.card:hover { transform: translateY(-2px); }

.card-head {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
}

.card-head img {
    width: 64px;
    height: 64px;
    object-fit: contain;
    flex-shrink: 0;
}

.card-head h3 {
    margin: 0;
    font-family: var(--mono);
    font-size: 1.15rem;
}

.card-head h3 a { color: var(--text); }

.card-head .sub {
    margin: 2px 0 0;
    font-size: .9rem;
    color: var(--muted);
}

.card > p { margin: 0 0 12px; }

.card ul {
    margin: 0 0 16px;
    padding-left: 20px;
    color: var(--muted);
    font-size: .95rem;
}

.card li { margin-bottom: 4px; }

.card li b { color: var(--text); font-weight: 600; }

.card code {
    font-family: var(--mono);
    font-size: .88em;
    padding: 1px 5px;
    border-radius: 5px;
    background: var(--bg);
    border: 1px solid var(--border);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: auto 0 16px;
    padding: 0;
    list-style: none;
}

.tags li {
    margin: 0;
    padding: 2px 10px;
    font-size: .8rem;
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 999px;
}

.card-links {
    display: flex;
    gap: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    font-size: .95rem;
    font-weight: 500;
}

/* ---------- Footer ---------- */

footer {
    padding: 40px 0 56px;
    color: var(--muted);
    font-size: .9rem;
}

@media (max-width: 560px) {
    body { font-size: 16px; }
    .hero { padding: 56px 0 40px; }
    .card { padding: 20px; }
    .card-head img { width: 52px; height: 52px; }
}