* { box-sizing: border-box; }
:root { --bg:#0b1220; --fg:#e6eaf2; --muted:#9aa4b2; --pri:#0f62fe; --card:#121a2b; }
html,body { height:100%; }
body { margin:0; background:var(--bg); color:var(--fg); font:16px/1.6 -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,'Apple Color Emoji','Segoe UI Emoji'; }
.container { max-width:720px; margin:40px auto; padding:0 16px; }
h1 { margin:0 0 6px; font-size:28px; }
.muted { color:var(--muted); }
.small { font-size:13px; }
.card { background:var(--card); border-radius:16px; padding:20px; margin:16px 0; box-shadow:0 8px 32px rgba(0,0,0,.25); }
.btn-row { display:flex; gap:12px; flex-wrap:wrap; }
.btn { appearance:none; border:1px solid rgba(255,255,255,.15); background:transparent; color:var(--fg); padding:10px 16px; border-radius:12px; cursor:pointer; }
.btn[disabled] { opacity:.5; cursor:not-allowed; }
.btn.primary { background:var(--pri); border-color:var(--pri); color:#fff; }
.progress-wrap { margin-top:16px; }
.progress-head { display:flex; align-items:center; justify-content:space-between; margin-bottom:8px; }
.progress-bar { height:10px; background:rgba(255,255,255,.1); border-radius:99px; overflow:hidden; }
.bar { height:100%; width:0%; background:linear-gradient(90deg,var(--pri),#38bdf8); transition:width .2s ease; }
.tips { margin-top:16px; }
code { background:rgba(255,255,255,.08); padding:2px 6px; border-radius:6px; }
footer { text-align:center; margin:24px 0; }
.info { margin-top:12px; }