* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background: #f3f4f6;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px;
}

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

.form-box {
  background: white;
  padding: 22px;
  border-radius: 14px;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.08);
}

h1 {
  text-align: center;
  margin-bottom: 18px;
  color: #111827;
  font-size: 26px;
}

.tab-buttons {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.tab-buttons button {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: #e5e7eb;
  color: #111827;
  font-size: 14px;
  cursor: pointer;
}

.tab-buttons button.active {
  background: #1f2937;
  color: white;
}

.input-group {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-bottom: 6px;
  color: #111827;
  font-weight: bold;
  font-size: 14px;
}

input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 14px;
}

input:focus {
  outline: none;
  border-color: #111827;
}

.error {
  display: block;
  min-height: 16px;
  margin-top: 5px;
  color: #dc2626;
  font-size: 12px;
}

#submitBtn {
  width: 100%;
  padding: 11px;
  border: none;
  border-radius: 8px;
  background: #1f2937;
  color: white;
  font-size: 14px;
  cursor: pointer;
  margin-top: 8px;
}

#submitBtn:hover {
  background: #111827;
}

#message {
  min-height: 20px;
  margin-top: 14px;
  text-align: center;
  font-weight: bold;
  font-size: 13px;
}

.success {
  color: #15803d;
}

.fail {
  color: #dc2626;
}

.hidden {
  display: none;
}