:root {
  color-scheme: light;
  font-family: Inter, "Microsoft YaHei", system-ui, sans-serif;
  background: #f3f5f7;
  color: #17212b;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: #f3f5f7; }
.auth-main { width: min(760px, calc(100% - 32px)); margin: 40px auto; }
.auth-main.narrow { width: min(440px, calc(100% - 32px)); }
.auth-panel {
  background: #fff;
  border: 1px solid #dfe4e8;
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 12px 40px rgba(22, 34, 48, .08);
}
h1 { margin: 0 0 8px; font-size: 28px; }
.lead { margin: 0 0 24px; color: #5c6873; line-height: 1.65; }
.notice { padding: 12px 14px; border-radius: 8px; margin-bottom: 18px; background: #fff3cd; border: 1px solid #ffe69c; }
.notice.error, .notice.danger { background: #f8d7da; border-color: #f1aeb5; color: #842029; }
.notice.success { background: #d1e7dd; border-color: #a3cfbb; color: #0a3622; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stack { display: grid; gap: 16px; }
.full { grid-column: 1 / -1; }
label { display: grid; gap: 7px; font-weight: 700; }
small { font-weight: 400; color: #68737d; }
input, select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid #cbd3da;
  border-radius: 8px;
  font: inherit;
  background: #fff;
}
input:focus, select:focus { outline: 3px solid rgba(13, 110, 253, .16); border-color: #0d6efd; }
button {
  width: 100%;
  margin-top: 22px;
  border: 0;
  border-radius: 8px;
  padding: 12px 16px;
  background: #0d6efd;
  color: #fff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
.hint { margin-top: 16px; font-size: 13px; color: #68737d; line-height: 1.6; }
@media (max-width: 640px) {
  .auth-main { margin: 18px auto; }
  .auth-panel { padding: 20px; }
  .grid { grid-template-columns: 1fr; }
  .full { grid-column: auto; }
}