.site-header{position:sticky;top:0;z-index:20;background:#0d1117dd;backdrop-filter:blur(8px);border-bottom:1px solid #21262d;padding:.85rem 1.1rem}
.site-header .brand{color:#e6edf3;text-decoration:none;font-weight:700;font-size:1.05rem;letter-spacing:.02em}
.site-header .brand:hover{color:#58a6ff}
.site-footer{border-top:1px solid #21262d;margin-top:3rem;padding:1.2rem 1.1rem;color:#6e7681;font-size:.86rem;text-align:center}

/* countdown overlay */
.cd-overlay{position:fixed;inset:0;background:#0d1117;display:flex;align-items:center;justify-content:center;z-index:9999}
.cd-box{text-align:center;padding:2rem;max-width:320px;width:100%}
.cd-box h2{margin:0 0 .4rem;font-size:1.1rem;color:#e6edf3}
.cd-box p{margin:0 0 1.2rem;color:#8b949e;font-size:.86rem}
.cd-box input{width:100%;padding:.8rem .9rem;border-radius:8px;border:1px solid #30363d;background:#161b22;color:#e6edf3;font-size:1rem;box-sizing:border-box}
.cd-box input:focus{outline:none;border-color:#58a6ff;box-shadow:0 0 0 3px #58a6ff2b}
.cd-box button{margin-top:.8rem;width:100%;padding:.8rem;border-radius:8px;border:none;background:#238636;color:#fff;font-size:1rem;cursor:pointer}
.cd-box button:hover{background:#2ea043}
.cd-err{margin-top:.9rem;color:#f85149;font-size:.85rem;min-height:1.2em}
.cd-ok{margin-top:.9rem;color:#3fb950;font-size:.85rem}
.hidden{display:none!important}