:root {
  --color-indigo-600: oklch(51.1% .262 276.966);
  --color-indigo-700: oklch(45.7% .24 277.023);
  --color-white: #ffffff;
  --color-gray-100: #f4f5f7;
  --color-gray-200: #e5e7eb;
  --color-gray-600: #4b5563;
  --color-gray-900: #111827;
  --color-red-600: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-white);
  color: var(--color-gray-900);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.app {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
  text-align: center;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
}

.subtitle {
  margin: 0 0 2rem;
  color: var(--color-gray-600);
}

.field-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
  max-width: 320px;
  margin: 0 auto 1.5rem;
  text-align: left;
}

.field-row label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-gray-600);
}

.field-row input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  border: 1px solid var(--color-gray-200);
  border-radius: 0.5rem;
  color: var(--color-gray-900);
}

.field-row input:focus {
  outline: 2px solid var(--color-indigo-600);
  outline-offset: 1px;
  border-color: var(--color-indigo-600);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.btn-primary {
  background: var(--color-indigo-600);
  color: var(--color-white);
  border: none;
  border-radius: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.05s ease;
  min-width: 180px;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-indigo-700);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Modal */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(17, 24, 39, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 50;
}

.modal-backdrop.hidden {
  display: none;
}

.modal {
  background: var(--color-white);
  border-radius: 0.75rem;
  max-width: 480px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 20px 40px rgba(17, 24, 39, 0.2);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem 0.5rem;
}

.modal-header h2 {
  margin: 0;
  font-size: 1.25rem;
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-gray-600);
  padding: 0.25rem 0.5rem;
}

.btn-close:hover {
  color: var(--color-gray-900);
}

.modal-body {
  margin: 0;
  padding: 0.5rem 1.5rem 1rem;
}

.modal-body .row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-gray-200);
  text-align: left;
}

.modal-body .row:last-child {
  border-bottom: none;
}

.modal-body dt {
  color: var(--color-gray-600);
  font-weight: 600;
  flex: 0 0 45%;
}

.modal-body dd {
  margin: 0;
  flex: 1;
  text-align: right;
  word-break: break-word;
}

.modal-footer {
  padding: 0.5rem 1.5rem 1.5rem;
  text-align: right;
}

/* Toast */

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%);
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: 0.75rem 1.25rem;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  max-width: 90vw;
  text-align: center;
  z-index: 60;
}

.toast.error {
  background: var(--color-red-600);
}

.toast.hidden {
  display: none;
}

@media (max-width: 480px) {
  .button-row {
    flex-direction: column;
  }

  .btn-primary {
    width: 100%;
  }
}