:root {
  color-scheme: light;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  color: #18212b;
  background: #edf1f4;
}

* { box-sizing: border-box; }

body { margin: 0; min-height: 100vh; }

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(420px, 100%);
  padding: 28px;
  border: 1px solid #cad2d9;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 18px 48px rgb(24 33 43 / 12%);
}

.login-panel header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 22px;
  border-bottom: 1px solid #e2e7eb;
}

.brand-mark {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border-radius: 6px;
  color: #fff;
  background: #16735f;
  font-weight: 700;
}

h1 { margin: 0; font-size: 21px; letter-spacing: 0; }
header p { margin: 4px 0 0; color: #66717c; font-size: 14px; }
form { display: grid; gap: 16px; padding-top: 22px; }
label { display: grid; gap: 7px; color: #3f4b56; font-size: 14px; }

input {
  width: 100%;
  height: 42px;
  padding: 0 11px;
  border: 1px solid #aeb8c1;
  border-radius: 5px;
  font: inherit;
}

input:focus { outline: 2px solid #318d78; outline-offset: 1px; border-color: #318d78; }

button {
  height: 42px;
  border: 0;
  border-radius: 5px;
  color: #fff;
  background: #16735f;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

button:hover { background: #105e4e; }
button:disabled { cursor: wait; opacity: .65; }
.login-error { min-height: 20px; margin: -4px 0; color: #b42318; font-size: 13px; }