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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #0f172a, #020617 50%, #020617 100%);
  color: #e5e7eb;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page {
  width: 100%;
  max-width: 480px;
  padding: 24px 16px 32px;
}

.header {
  text-align: center;
  margin-bottom: 20px;
}

.title {
  margin: 0 0 8px;
  font-size: 24px;
  font-weight: 700;
  color: #f9fafb;
}

.subtitle {
  margin: 0;
  font-size: 13px;
  color: #9ca3af;
}

.card {
  background: rgba(15, 23, 42, 0.95);
  border-radius: 18px;
  padding: 20px 18px 18px;
  box-shadow:
    0 18px 45px rgba(15, 23, 42, 0.9),
    0 0 0 1px rgba(148, 163, 184, 0.18);
  backdrop-filter: blur(16px);
}

.form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 13px;
  color: #d1d5db;
}

.form-group input {
  border-radius: 10px;
  border: 1px solid rgba(55, 65, 81, 0.8);
  background: rgba(15, 23, 42, 0.9);
  padding: 9px 11px;
  color: #e5e7eb;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.form-group input::placeholder {
  color: #6b7280;
}

.form-group input:focus {
  border-color: #4f46e5;
  box-shadow: 0 0 0 1px rgba(79, 70, 229, 0.5);
  background: #020617;
}

.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 6px;
}

button#submit-btn {
  flex: 1;
  border: none;
  border-radius: 999px;
  padding: 9px 14px;
  font-size: 14px;
  font-weight: 600;
  color: #f9fafb;
  cursor: pointer;
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  box-shadow: 0 10px 25px rgba(79, 70, 229, 0.55);
  transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.12s ease;
}

button#submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(79, 70, 229, 0.65);
  filter: brightness(1.03);
}

button#submit-btn:active {
  transform: translateY(0);
  box-shadow: 0 8px 18px rgba(79, 70, 229, 0.5);
  filter: brightness(0.98);
}

button#submit-btn:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
}

.loading {
  font-size: 12px;
  color: #9ca3af;
  white-space: nowrap;
}

.loading[aria-hidden="true"] {
  visibility: hidden;
}

.result {
  margin-top: 14px;
  padding: 10px 11px;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.5;
}

.result--hidden {
  display: none;
}

.result--success {
  background: rgba(22, 163, 74, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.4);
  color: #bbf7d0;
}

.result--error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.4);
  color: #fecaca;
}

.result-title {
  margin: 0 0 4px;
  font-weight: 600;
}

.result-body {
  margin: 0;
}

.footer {
  margin-top: 18px;
  text-align: center;
  font-size: 12px;
  color: #6b7280;
}

@media (max-width: 640px) {
  .page {
    max-width: 100%;
  }

  .card {
    padding: 18px 14px 16px;
  }
}