*{margin:0;box-sizing:border-box}
html,body{height:100%}
body{background:#000;color:#fff;font-family:Arial,"Noto Sans SC",sans-serif;overflow:hidden}
.bg{position:fixed;inset:0;background:url("背景2.png") center/cover;filter:brightness(.35) contrast(1.12)}
header{position:relative;padding:20px 24px;font-size:13px;font-weight:700;letter-spacing:.2em}
header span{color:#888;font-weight:400;margin-left:12px}
main{position:relative;height:calc(100% - 120px);display:flex;flex-direction:column;justify-content:center;text-align:center;padding:0 24px;margin:0 auto;width:100%;max-width:420px}
h1{font-size:56px;letter-spacing:.1em;text-indent:.1em;color:#fff;line-height:1;margin-bottom:6px}
.meta{font-size:11px;letter-spacing:.3em;color:#aaa;margin-bottom:20px}
.tabs{display:flex;gap:8px;justify-content:center;margin-bottom:12px}
.tabs button{width:120px;height:34px;background:transparent;color:#888;border:1px solid #444;font:700 13px Arial;letter-spacing:.4em;text-indent:.4em;cursor:pointer}
.tabs button.on{background:#fff;color:#000;border-color:#fff}
form{display:flex;flex-direction:column;gap:8px}
input{height:44px;background:rgba(0,0,0,.6);border:1px solid #555;color:#fff;padding:0 12px;font:14px Consolas,monospace;letter-spacing:.1em;outline:none}
input:focus{border-color:#fff}
#submit{height:46px;background:#fff;color:#000;border:0;font:700 15px Arial;letter-spacing:.4em;text-indent:.4em;cursor:pointer;margin-top:4px}
#submit:disabled{opacity:.5;cursor:wait}
.row{display:flex;justify-content:space-between;font:12px Consolas,monospace;color:#aaa;margin:10px 0 6px;text-align:left}
#msg{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:320px}
.bar{height:4px;background:#333}
#fill{height:100%;width:0%;background:#fff;transition:width .3s}
footer{position:relative;padding:16px 24px;font:12px Consolas,monospace;color:#666;border-top:1px solid #222}