:root {
    --bg: #ffffff;
    --fg: #000000;
    --muted: #666666;
    --line: #000000;
    --hair: rgba(0,0,0,.12);
    --radius: 28px;
    --mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', 'Courier New', monospace;
    --max: 1400px;
}

:root[data-theme="dark"] {
    --bg: #121212;
    --fg: #f2f2f2;
    --muted: #a8a8a8;
    --line: #f2f2f2;
    --hair: rgba(255,255,255,.18);
}

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

body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--mono);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.grid-background {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(0deg, transparent 24%, rgba(0,0,0,.05) 25%, rgba(0,0,0,.05) 26%, transparent 27%, transparent 74%, rgba(0,0,0,.05) 75%, rgba(0,0,0,.05) 76%, transparent 77%, transparent),
        linear-gradient(90deg, transparent 24%, rgba(0,0,0,.05) 25%, rgba(0,0,0,.05) 26%, transparent 27%, transparent 74%, rgba(0,0,0,.05) 75%, rgba(0,0,0,.05) 76%, transparent 77%, transparent);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 1;
}

:root[data-theme="dark"] .grid-background {
    background-image:
        linear-gradient(0deg, transparent 24%, rgba(255,255,255,.08) 25%, rgba(255,255,255,.08) 26%, transparent 27%, transparent 74%, rgba(255,255,255,.08) 75%, rgba(255,255,255,.08) 76%, transparent 77%, transparent),
        linear-gradient(90deg, transparent 24%, rgba(255,255,255,.08) 25%, rgba(255,255,255,.08) 26%, transparent 27%, transparent 74%, rgba(255,255,255,.08) 75%, rgba(255,255,255,.08) 76%, transparent 77%, transparent);
}

/* ---------- nav ---------- */

.topnav {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 40px;
    background: var(--bg);
    border-bottom: 2px solid var(--line);
}

.topnav .brand {
    font-weight: bold;
    letter-spacing: 2px;
    font-size: 1.1em;
    text-decoration: none;
}

.topnav .brand .dot { color: var(--muted); }

.topnav .links {
    display: flex;
    gap: 28px;
    font-size: .82em;
    letter-spacing: .5px;
}

.topnav .links a {
    text-decoration: none;
    padding-bottom: 3px;
    border-bottom: 2px solid transparent;
    transition: border-color .15s;
}

.topnav .links a:hover,
.topnav .links a.current {
    border-bottom-color: var(--fg);
}

.theme-toggle {
    padding: 4px 10px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: transparent;
    color: var(--fg);
    font: inherit;
    font-size: .75rem;
    cursor: pointer;
}

.theme-toggle:hover { background: var(--fg); color: var(--bg); }

/* ---------- shared page shell ---------- */

.container {
    position: relative;
    z-index: 2;
    max-width: var(--max);
    margin: 0 auto;
    padding: 40px;
}

footer {
    position: relative;
    z-index: 2;
    border-top: none;
    padding: 32px 40px;
    text-align: center;
    font-size: .8em;
    letter-spacing: 2px;
    color: var(--muted);
}

footer a { text-decoration: none; color: var(--fg); font-weight: bold; }

/* ---------- home part ---------- */

.hero {
    position: relative;
    z-index: 2;
    padding: 70px 40px 50px;
    border-bottom: 2px solid var(--line);
}

.hero-inner {
    max-width: var(--max);
    margin: 0 auto;
}

.hero h1 {
    font-family: Arial, Helvetica, sans-serif;
    font-size: clamp(2.4em, 6vw, 4.2em);
    font-weight: 900;
    letter-spacing: 1px;
    line-height: 1.02;
    margin-bottom: 24px;
}

.hero-bio {
    max-width: 780px;
    font-size: .95em;
    line-height: 1.75;
    color: #222;
    border-left: 2px solid var(--line);
    padding-left: 20px;
}

:root[data-theme="dark"] .hero-bio { color: #e0e0e0; }

.hero-bio a {
    font-weight: bold;
    text-decoration: underline;
}

.hero-meta {
    margin-top: 20px;
    font-size: .78em;
    color: var(--muted);
    letter-spacing: 1px;
}

@media (max-width: 820px) {
    .topnav, footer { padding-left: 18px; padding-right: 18px; }
    .topnav { flex-wrap: wrap; gap: 10px; }
    .topnav .links { width: 100%; gap: 14px; overflow-x: auto; padding-bottom: 2px; }
    .hero { padding: 48px 18px 38px; }
    .hero h1 { font-size: clamp(2.2rem, 12vw, 3.1rem); margin-bottom: 18px; }
    .hero-bio { padding-left: 14px; font-size: .9rem; }
}

@media (min-width: 821px) and (max-width: 1120px) {
    .topnav, footer { padding-left: 28px; padding-right: 28px; }
    .hero { padding: 60px 28px 44px; }
    .container { padding-left: 28px; padding-right: 28px; }
}

@media (max-width: 560px) {
    .grid-background { background-size: 32px 32px; }
    .topnav { padding: 14px 16px; gap: 12px; }
    .topnav .brand { font-size: .96rem; }
    .topnav .links {
        width: 100%;
        flex-wrap: wrap;
        gap: 10px 14px;
        overflow: visible;
        font-size: .76rem;
        line-height: 1.25;
    }
    .hero { padding: 42px 16px 32px; }
    .hero h1 { font-size: clamp(2.15rem, 12vw, 2.8rem); }
    .hero-bio {
        border-left: 0;
        border-top: 2px solid var(--line);
        padding: 14px 0 0;
        font-size: .88rem;
        line-height: 1.68;
    }
    footer { padding: 24px 16px; font-size: .72rem; letter-spacing: 1.2px; }
}