:root {
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: #1f2927;
  background: #edf2f0;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
.login-shell {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
  background: linear-gradient(135deg, #edf2f0, #f9fbfa);
}
.login-panel {
  width: min(420px, 100%);
  padding: 40px;
  background: #fff;
  border: 1px solid #dbe2df;
  border-top: 4px solid #b85d32;
  box-shadow: 0 18px 50px rgba(24, 49, 46, .12);
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  color: #fff;
  background: #18312e;
  border-radius: 6px;
  font-weight: 700;
}
.eyebrow { margin: 26px 0 8px; color: #176b5f; font-size: 13px; font-weight: 700; }
h1 { margin: 0; font-size: 28px; letter-spacing: 0; }
.intro { margin: 12px 0 28px; color: #697471; line-height: 1.7; }
label { display: grid; gap: 8px; color: #465451; font-size: 14px; font-weight: 700; }
input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  color: #1f2927;
  background: #fbfcfc;
  border: 1px solid #cbd7d3;
  border-radius: 4px;
}
input:focus { outline: 2px solid rgba(23, 107, 95, .25); border-color: #176b5f; }
button {
  width: 100%;
  min-height: 46px;
  margin-top: 20px;
  color: #fff;
  background: #176b5f;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 700;
}
button:disabled { opacity: .65; cursor: wait; }
.status { min-height: 22px; margin: 14px 0 0; color: #a5443b; font-size: 13px; line-height: 1.5; }