:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1e21;
  --muted: #6b7280;
  --border: #d7dade;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --err-bg: #fdecea;
  --err-text: #b3261e;
  --ok-bg: #e8f5e9;
  --ok-text: #1b5e20;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --card: #23262d;
    --text: #e7e9ee;
    --muted: #9aa1ac;
    --border: #3a3f48;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --err-bg: #3a2222;
    --err-text: #f2b8b5;
    --ok-bg: #1f3324;
    --ok-text: #a5d6a7;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 20px 0;
}
.brand { font-weight: 600; font-size: 17px; }
.brand .domain { color: var(--muted); font-weight: 400; }
.card {
  max-width: 760px;
  margin: 16px auto 48px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px 28px 28px;
}
.login-card { max-width: 380px; margin-top: 12vh; }
.login-card h1 { margin: 0 0 2px; font-size: 24px; }
.login-card .sub { margin: 0 0 20px; color: var(--muted); }
label { display: block; margin: 14px 0 0; font-size: 13.5px; color: var(--muted); }
input[type="text"], input[type="password"], textarea {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 9px 11px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
}
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
textarea { resize: vertical; }
.row { display: flex; gap: 16px; flex-wrap: wrap; }
.row .grow { flex: 1 1 240px; }
.addr-input { display: flex; margin-top: 5px; align-items: center; }
.addr-input input { margin-top: 0; border-radius: 7px 0 0 7px; }
.addr-input .suffix {
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-left: 0;
  border-radius: 0 7px 7px 0;
  background: var(--card);
  color: var(--muted);
  white-space: nowrap;
}
details { margin-top: 14px; }
summary { cursor: pointer; font-size: 13.5px; color: var(--muted); }
.opts { margin-top: 16px; gap: 24px; }
.check { display: flex; align-items: center; gap: 7px; margin: 0; color: var(--text); }
.check input { accent-color: var(--accent); }
input[type="file"] { margin-top: 6px; font-size: 13.5px; color: var(--muted); }
.hint { display: block; margin-top: 4px; font-size: 12.5px; color: var(--muted); }
button {
  margin-top: 20px;
  padding: 10px 22px;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 0;
  border-radius: 7px;
  cursor: pointer;
}
button:hover { background: var(--accent-hover); }
button:disabled { opacity: 0.6; cursor: default; }
button.ghost {
  margin: 0;
  padding: 6px 14px;
  font-weight: 400;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--border);
}
button.ghost:hover { color: var(--text); background: var(--bg); }
.msg {
  margin-top: 16px;
  padding: 10px 14px;
  border-radius: 7px;
  background: var(--err-bg);
  color: var(--err-text);
  word-break: break-all;
}
.msg.ok { background: var(--ok-bg); color: var(--ok-text); }
.login-card button { width: 100%; }