[hidden] { display: none !important; }

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #f0f4f8;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  color: #1a202c;
}

.container {
  width: 100%;
  max-width: 540px;
}

.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  padding: 2.5rem 2rem;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #1a202c;
}

.subtitle {
  font-size: 0.95rem;
  color: #718096;
  margin-bottom: 2rem;
  line-height: 1.5;
}

.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: #2d3748;
}

input,
textarea {
  width: 100%;
  padding: 0.65rem 0.9rem;
  border: 1.5px solid #e2e8f0;
  border-radius: 8px;
  font-size: 0.95rem;
  color: #1a202c;
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
  resize: vertical;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: #4f46e5;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

input.invalid,
textarea.invalid {
  border-color: #e53e3e;
}

.error-msg {
  display: block;
  font-size: 0.8rem;
  color: #e53e3e;
  margin-top: 0.3rem;
  min-height: 1rem;
}

button[type="submit"] {
  width: 100%;
  padding: 0.75rem;
  background: #4f46e5;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
  transition: background 0.2s, transform 0.1s;
}

button[type="submit"]:hover:not(:disabled) {
  background: #4338ca;
}

button[type="submit"]:active:not(:disabled) {
  transform: scale(0.98);
}

button[type="submit"]:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.alert {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.9rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-top: 1.25rem;
  line-height: 1.5;
}

.alert svg {
  flex-shrink: 0;
  margin-top: 1px;
}

.alert-success {
  background: #f0fff4;
  color: #276749;
  border: 1px solid #9ae6b4;
}

.alert-error {
  background: #fff5f5;
  color: #c53030;
  border: 1px solid #feb2b2;
}

@media (max-width: 480px) {
  .card {
    padding: 1.75rem 1.25rem;
  }
}