:root{--bg:#EDF0F4;--card:#fff;--ink:#0F1A28;--muted:#5B6A7E;--line:#DCE2EA;--accent:#EC5A2A;--bad:#D33F3F;--good:#11975F}
@media(prefers-color-scheme:dark){:root{--bg:#0B1119;--card:#141C27;--ink:#E9EEF5;--muted:#98A6B9;--line:#25303F;--accent:#FF7547;--bad:#FF6B6B;--good:#3CCB8F}}
*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center;padding:20px;background:var(--bg);color:var(--ink);font:16px/1.5 -apple-system,"Segoe UI",Roboto,sans-serif}
main{background:var(--card);padding:28px;border-radius:18px;box-shadow:0 8px 24px rgba(15,26,40,.08);display:grid;gap:14px;width:min(440px,100%)}
h1{margin:0;font-size:24px}h2{margin:6px 0 0;font-size:17px}p{margin:0}.muted{color:var(--muted)}.small{font-size:14px}
button,input{font:inherit;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:transparent;color:var(--ink)}
button{cursor:pointer;font-weight:650}button.primary{background:var(--accent);border-color:var(--accent);color:#fff}button.link{border:0;padding:4px 0;background:none;color:var(--muted);text-decoration:underline;font-weight:500;justify-self:start}
button.danger{color:var(--bad)}button:disabled{opacity:.5;cursor:default}
.msg{min-height:1.4em;font-size:14px}.msg.err{color:var(--bad)}.msg.ok{color:var(--good)}
[hidden]{display:none!important}.row{display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.dev{display:flex;gap:10px;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--line)}.dev:last-child{border:0}
.code{font:700 28px ui-monospace,Menlo,monospace;letter-spacing:.12em;text-align:center;padding:14px;background:var(--bg);border-radius:12px}
a{color:var(--accent)}