:root { --bg: #0D1117; --panel: rgba(255,255,255,0.05); --text: #f4f7fb; --muted: #b2b9c5; --line: rgba(255,255,255,0.10); --blue: #428FD2; }
html[data-theme="light"] { --bg: #f6f8fc; --panel: rgba(255,255,255,0.9); --text: #0d1422; --muted: #526075; --line: rgba(12,22,40,0.09); }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 24px; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif; background: var(--bg); color: var(--text); line-height: 1.55; -webkit-font-smoothing: antialiased; }
main { width: min(520px, 100%); padding: 28px 24px; border: 1px solid var(--line); border-radius: 24px; background: var(--panel); text-align: center; }
h1 { margin: 0 0 10px; font-size: clamp(1.5rem, 4vw, 2rem); letter-spacing: -0.03em; }
p { margin: 0 0 14px; color: var(--muted); }
a { color: var(--blue); text-decoration: none; font-weight: 600; }
a:hover, a:focus-visible { text-decoration: underline; text-underline-offset: 0.18em; }