:root {
  --bg: #f4f1e7;
  --card: #fffdf7;
  --ink: #1f2a24;
  --muted: #7b816f;
  --green: #1f4d38;
  --green-2: #2f6b4f;
  --line: #e5dfd0;
  --red: #a23b32;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background:
    radial-gradient(900px 500px at 15% 0%, #e9efdf 0%, transparent 60%),
    radial-gradient(700px 500px at 100% 100%, #efe6d5 0%, transparent 55%),
    var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", system-ui, sans-serif;
}
.auth-shell { min-height: 100%; display: grid; place-items: center; padding: 28px 18px; }
.auth-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 24px 60px rgba(50, 58, 44, .10);
}
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 30px; }
.brand-mark {
  width: 44px; height: 44px; border-radius: 13px; display: grid; place-items: center;
  background: var(--green); color: #edf3d8; font-weight: 800; font-size: 18px;
}
.brand h1 { margin: 0; font-size: 17px; letter-spacing: .04em; }
.brand p { margin: 3px 0 0; font-size: 8.5px; letter-spacing: .16em; color: var(--muted); }
.auth-copy { margin-bottom: 22px; }
.kicker { display: block; font-size: 8.5px; letter-spacing: .16em; font-weight: 700; color: var(--green-2); margin-bottom: 9px; }
.auth-copy h2 { margin: 0 0 8px; font-size: 27px; letter-spacing: -.02em; }
.auth-copy p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.7; }
.pin-label { display: block; font-size: 10px; font-weight: 700; color: var(--muted); margin: 14px 0 6px; }
.pin-input {
  width: 100%; height: 52px; border: 1px solid var(--line); border-radius: 10px;
  background: #fbf8ef; padding: 0 14px; font-size: 20px; letter-spacing: .24em;
  color: var(--ink); outline: none;
}
.pin-input:focus { border-color: var(--green-2); box-shadow: 0 0 0 3px rgba(47,107,79,.10); }
.auth-submit {
  width: 100%; height: 50px; margin-top: 20px; border: 0; border-radius: 10px;
  background: var(--green); color: #f7f4e8; font-size: 13px; font-weight: 700;
  cursor: pointer; transition: background .18s ease;
}
.auth-submit:hover { background: var(--green-2); }
.auth-submit:disabled { opacity: .55; cursor: wait; }
.auth-error { min-height: 18px; margin: 10px 0 0; color: var(--red); font-size: 11px; line-height: 1.5; }
.auth-hint { margin: 18px 0 0; color: var(--muted); font-size: 10px; line-height: 1.7; }
.auth-hint code { background: #f0ecdf; padding: 2px 5px; border-radius: 4px; }
.auth-foot { margin: 18px 0 0; padding-top: 14px; border-top: 1px solid var(--line); color: #9b9d8c; font-size: 9px; letter-spacing: .04em; }
.hidden { display: none !important; }
@media (max-width: 420px) {
  .auth-card { padding: 24px 20px; border-radius: 15px; }
  .auth-copy h2 { font-size: 24px; }
}