:root{--bg:#0d1117;--panel:#161b22;--border:#2d333b;--text:#e6edf3;--muted:#8b949e;--accent:#58a6ff;--down:#f85149}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:ui-sans-serif,-apple-system,"Segoe UI",Roboto,sans-serif;min-height:100vh;display:grid;place-items:center;padding:1rem}
form{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:2rem;width:100%;max-width:360px;display:flex;flex-direction:column;gap:1rem}
.mark{width:34px;height:34px;border-radius:8px;background:linear-gradient(160deg,var(--accent) 48%,#3fb950 52%)}
h1{font-size:1.15rem}
p{color:var(--muted);font-size:.82rem}
input{background:#0d1117;border:1px solid var(--border);border-radius:8px;padding:.65rem .8rem;color:var(--text);font-size:1rem;width:100%}
input:focus{outline:none;border-color:var(--accent)}
button{background:var(--accent);color:#0d1117;font-weight:700;border:none;border-radius:8px;padding:.65rem;font-size:.95rem;cursor:pointer}
button:hover{filter:brightness(1.1)}
.err{color:var(--down);font-size:.8rem;min-height:1.1em}