* {
  box-sizing: border-box;
  font-family: 'Segoe UI', Arial, sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #3ecf8e, #1c1c1c);
}

.container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.card {
  background: #ffffff;
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.card h1 {
  text-align: center;
  font-size: 22px;
  margin-bottom: 20px;
  color: #1c1c1c;
}

.tabs {
  display: flex;
  margin-bottom: 20px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #ddd;
}

.tab-btn {
  flex: 1;
  padding: 10px;
  border: none;
  background: #f5f5f5;
  cursor: pointer;
  font-weight: 600;
  color: #555;
  transition: 0.2s;
}

.tab-btn.active {
  background: #3ecf8e;
  color: white;
}

.form {
  display: none;
  flex-direction: column;
  gap: 6px;
}

.form.active {
  display: flex;
}

.form label {
  font-size: 13px;
  color: #333;
  margin-top: 8px;
}

.form input {
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 14px;
}

.form button {
  margin-top: 16px;
  padding: 12px;
  background: #3ecf8e;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s;
}

.form button:hover {
  background: #34b57b;
}

#message {
  text-align: center;
  margin-top: 14px;
  font-size: 14px;
  color: #d9534f;
  min-height: 18px;
}

.hidden {
  display: none !important;
}

#dashboard {
  text-align: center;
}

#logoutBtn {
  margin-top: 16px;
  padding: 10px 20px;
  background: #d9534f;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}