:root {
  --header: #184f95;
  --header-dark: #0d3266;
  --accent: #eef4fc;
  --border: #c9ddf5;
  --text: #132437;
  --text-soft: #5b7189;
  --err-bg: #f8d7da; --err-text: #721c24;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--text); }
body {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--header) 0%, var(--header-dark) 55%, #d68f2a 55%, #d68f2a 56%, var(--header-dark) 56%);
  padding: 20px;
}
.login-card {
  background: #fff; width: 100%; max-width: 380px; border-radius: 4px;
  box-shadow: 0 20px 60px rgba(9,47,107,0.35); overflow: hidden;
}
.login-brand { background: var(--header); color: #fff; padding: 28px 28px 22px; }
.login-brand .mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; background: #fff; color: var(--header);
  font-weight: 700; border-radius: 4px; font-size: 15px; margin-bottom: 14px;
}
.login-brand h1 { font-size: 19px; margin: 0 0 4px; font-weight: 700; letter-spacing: .2px; }
.login-brand p { margin: 0; font-size: 13px; color: #cfe0f7; }
.login-body { padding: 26px 28px 28px; }
.login-body label { display: block; font-size: 13px; color: var(--text-soft); margin-bottom: 6px; font-weight: 700; }
.login-body input {
  width: 100%; padding: 11px 12px; border: 1.5px solid var(--border); border-radius: 4px;
  font-size: 14px; font-family: inherit; margin-bottom: 16px;
}
.login-body input:focus { outline: 2px solid var(--header); border-color: var(--header); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none; border-radius: 4px; padding: 11px 18px; font-family: inherit;
  font-size: 14px; font-weight: 700; cursor: pointer; width: 100%;
  background: var(--header); color: #fff; transition: filter .15s ease;
}
.btn:hover { filter: brightness(1.1); }
.btn[disabled] { opacity: .45; cursor: not-allowed; }
.login-error {
  font-size: 13px; color: var(--err-text); background: var(--err-bg);
  border-radius: 4px; padding: 8px 10px; margin: -6px 0 14px; display: none;
}
.login-error.show { display: block; }