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

:root {
  --primary: #1a3c5e;
  --primary-hover: #0f2640;
  --accent: #e8a320;
  --bg: #f5f7fa;
  --card-bg: #ffffff;
  --text: #1f2d3d;
  --text-muted: #6b7a8d;
  --border: #dce3ec;
  --success-bg: #edf7ed;
  --success-border: #4caf50;
  --error-bg: #fdecea;
  --error-border: #e53935;
  --radius: 10px;
  --shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 32px 16px;
}

.container {
  max-width: 680px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 32px;
}

h1 {
  font-size: 1.9rem;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: -0.5px;
}

.subtitle {
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 1rem;
}

form {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}

.form-section {
  margin-bottom: 28px;
}

.form-section h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
}

.form-group {
  margin-bottom: 18px;
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-row .form-group {
  min-width: 100px;
}

.flex-grow {
  flex: 1;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
}

.required {
  color: #e53935;
}

input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 7px;
  font-size: 0.95rem;
  color: var(--text);
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 60, 94, 0.1);
}

input.invalid {
  border-color: var(--error-border);
  box-shadow: 0 0 0 3px rgba(229, 57, 53, 0.1);
}

.hint {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

button[type="submit"] {
  width: 100%;
  padding: 13px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  margin-top: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

button[type="submit"]:hover:not(:disabled) {
  background: var(--primary-hover);
}

button[type="submit"]:active:not(:disabled) {
  transform: scale(0.99);
}

button[type="submit"]:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-secondary {
  margin-top: 16px;
  padding: 10px 24px;
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.btn-secondary:hover {
  background: var(--primary);
  color: #fff;
}

.message {
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-top: 16px;
}

.message.error {
  background: var(--error-bg);
  border: 1.5px solid var(--error-border);
  color: #b71c1c;
  font-size: 0.92rem;
}

.message.success {
  background: var(--success-bg);
  border: 1.5px solid var(--success-border);
  text-align: center;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  padding: 40px 32px;
}

.success-icon {
  font-size: 3rem;
  color: #4caf50;
  line-height: 1;
  margin-bottom: 12px;
}

.message.success h3 {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: 10px;
}

.message.success p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.hidden {
  display: none !important;
}

/* Spinner Animation */
.spinner {
  width: 20px;
  height: 20px;
  animation: spin 0.9s linear infinite;
}

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

@media (max-width: 500px) {
  form { padding: 20px 16px; }
  .form-row { flex-direction: column; gap: 0; }
  h1 { font-size: 1.5rem; }
}