* {
  box-sizing: border-box;
}
html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", sans-serif;
  background: #f5f8ff;
  color: #102a43;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
}
.page {
  width: min(100%, 420px);
  padding: 32px;
  border-radius: 22px;
  background: #ffffff;
  box-shadow: 0 20px 60px rgba(16, 42, 67, 0.12);
}
h1 {
  margin-top: 0;
  margin-bottom: 24px;
  font-size: 1.9rem;
}
.form-card {
  display: grid;
  gap: 16px;
}
label {
  display: grid;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}
input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #d9e2ec;
  border-radius: 14px;
  background: #f8fafc;
  font-size: 1rem;
}
button {
  width: 100%;
  padding: 14px 18px;
  border: none;
  border-radius: 14px;
  background: #2563eb;
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}
button:hover {
  background: #1d4ed8;
}
.error {
  color: #dc2626;
  min-height: 1.2em;
}
#logoutButton {
  margin-top: 24px;
}
#sessionStatus {
  margin-top: 16px;
  color: #475569;
}

.auth-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}
.tab-btn {
  background: #f1f5f9;
  color: #64748b;
  border-radius: 10px;
  padding: 10px;
}
.tab-btn.active {
  background: #2563eb;
  color: #fff;
}