:root {
  --bg: #f3f5f8;
  --surface: #ffffff;
  --line: #dfe6ee;
  --text: #1a2332;
  --muted: #6b7a90;
  --primary: #218b74;
  --primary-dark: #1b745f;
  --primary-soft: #e6f3ef;
  --bad: #b42318;
  --bad-soft: #fef3f2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "DM Sans", ui-sans-serif, system-ui, sans-serif;
  color: var(--text);
  background: linear-gradient(160deg, #edf5f2 0%, var(--bg) 45%, #eef2f8 100%);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
}

.login-card {
  width: min(440px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px 24px;
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
}

.login-brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 22px;
}

.login-brand img {
  border-radius: 12px;
  background: #1f8a70;
  padding: 6px;
}

.login-brand h1 {
  margin: 0 0 4px;
  font-size: 22px;
}

.login-brand p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
}

.login-message {
  margin: 0 0 16px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.45;
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.login-message--error {
  background: var(--bad-soft);
  color: var(--bad);
}

.btn-microsoft {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  min-height: 48px;
  border-radius: 10px;
  border: 1px solid #8c8c8c;
  background: #ffffff;
  color: #1a2332;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s, box-shadow 0.15s;
}

.btn-microsoft:hover {
  background: #f8f8f8;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.login-hints {
  margin: 20px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.login-hints strong {
  color: var(--text);
}