:root{
  color-scheme:dark;
  --bg:#080b14;--card:#111726;--line:#222c42;--text:#e8ecf6;--muted:#8b96ad;
  --accent:#7aa2ff;--accent-2:#9d7bff;--ok:#5fd39a;--warn:#ffb86b;--bad:#ff7a8a;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:radial-gradient(1200px 700px at 50% -10%,#152040 0%,var(--bg) 55%);color:var(--text);
  font:15px/1.55 system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;min-height:100%}
body{padding:24px 16px 48px;display:flex;justify-content:center}
.card{width:100%;max-width:560px;background:linear-gradient(180deg,#121a2b 0%,#0e1421 100%);
  border:1px solid var(--line);border-radius:20px;padding:24px 20px 28px;box-shadow:0 24px 60px rgba(0,0,0,.45)}
.head{text-align:center;margin-bottom:16px}
.moon{width:54px;height:54px;margin:0 auto 12px;border-radius:50%;
  background:radial-gradient(circle at 32% 30%,#fff 0%,#dfe6ff 38%,#9db3ff 70%,#6d86dd 100%);
  box-shadow:0 0 40px rgba(122,162,255,.45),inset -10px -8px 18px rgba(20,30,60,.55)}
h1{font-size:20px;margin:0 0 6px;letter-spacing:.02em}
.sub{margin:0;color:var(--muted);font-size:13px}
.tabs{display:flex;gap:8px;background:#0b111c;border:1px solid var(--line);border-radius:12px;padding:4px;margin:0 0 16px}
.tab{flex:1;padding:8px 10px;border:0;border-radius:9px;background:transparent;color:var(--muted);font:inherit;font-size:13px;cursor:pointer}
.tab.active{background:var(--accent);color:#08101f;font-weight:650}
.field{display:block;margin:14px 0}
.field>span{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:6px}
input,select,textarea{width:100%;padding:11px 12px;border-radius:12px;border:1px solid var(--line);background:#0b111c;color:var(--text);
  font:inherit;outline:none;transition:border-color .15s,box-shadow .15s}
textarea{resize:vertical;font-family:ui-monospace,Consolas,monospace;font-size:12.5px;line-height:1.5}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(122,162,255,.16)}
input::placeholder,textarea::placeholder{color:#5b6680}
.row{display:flex;gap:12px}.row .field{flex:1;margin:14px 0}
.hintbtn{margin-left:auto;border:1px solid var(--line);background:#0b111c;color:var(--muted);border-radius:50%;
  width:24px;height:24px;font-size:13px;cursor:pointer}
.hintbtn:hover{color:var(--text);border-color:var(--accent)}
.custom{margin-top:-4px;padding:4px 14px 8px;border:1px dashed var(--line);border-radius:14px}
.help{margin:16px 0;border:1px solid var(--line);border-radius:14px;padding:10px 14px;background:#0b111c}
.help summary{cursor:pointer;color:var(--accent);font-size:13px}
.help ol{margin:10px 0 6px 18px;padding:0;color:var(--muted);font-size:13px}
.help code,.session-steps code{background:#0b111c;border:1px solid var(--line);border-radius:6px;padding:1px 5px;font-size:12px;color:#cfe0ff}
.warn{margin:6px 0 0;color:var(--warn);font-size:12px}
.note{margin:8px 0 0;color:var(--muted);font-size:12px;line-height:1.6}
.session-steps{border:1px solid var(--line);border-radius:14px;padding:10px 14px;background:#0b111c}
.session-steps ol{margin:4px 0 6px 18px;padding:0;color:var(--muted);font-size:13px}
.session-steps li{margin:4px 0}
.link{color:var(--accent)}
.consent{display:flex;gap:10px;align-items:flex-start;margin:16px 0;font-size:13px;color:var(--muted)}
.consent input{margin-top:3px;width:16px;height:16px;accent-color:var(--accent)}
button[type=submit]{width:100%;padding:13px;border:0;border-radius:14px;cursor:pointer;color:#08101f;font-weight:700;font-size:15px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));transition:filter .15s,opacity .15s}
button[type=submit]:hover{filter:brightness(1.06)}
button[type=submit]:disabled{opacity:.55;cursor:default}
.status{min-height:22px;margin:12px 0 0;font-size:13px;text-align:center}
.status.ok{color:var(--ok)}.status.err{color:var(--bad)}
.fatal{margin:12px 0;padding:12px 14px;border-radius:12px;background:rgba(255,122,138,.1);border:1px solid rgba(255,122,138,.35);color:var(--bad);font-size:13px}
@media (max-width:420px){.row{flex-direction:column;gap:0}}