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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 18px;
  line-height: 1.4;
  color: #111;
  background: #f4f4f5;
}

.app {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1rem 1rem 2.5rem;
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
}

.add-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.add-form label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-weight: 600;
}

textarea {
  width: 100%;
  font: inherit;
  font-size: 16px;
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  resize: vertical;
  min-height: 3.5rem;
}

button {
  font: inherit;
  font-size: 18px;
  min-height: 44px;
  padding: 0.7rem 1rem;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}

#add-button {
  background: #1d4ed8;
  color: #fff;
}

.form-error {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0;
  color: #991b1b;
}

.form-error p {
  margin: 0;
  flex: 1;
  min-width: 0;
}

.form-error[hidden] {
  display: none;
}

#form-error-clear {
  flex: 0 0 auto;
  min-width: 4.5rem;
  background: #fee2e2;
  color: #991b1b;
}

.empty-state {
  margin: 0 0 0.75rem;
  color: #555;
}

.card-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 10px;
  overflow: hidden;
}

.card-face {
  flex: 1;
  min-width: 0;
  text-align: left;
  background: transparent;
  color: inherit;
  border-radius: 0;
  padding: 1rem;
}

.card-text {
  white-space: pre-wrap;
  word-break: break-word;
}

.card-side {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: #666;
  margin-bottom: 0.35rem;
}

.card-delete {
  flex: 0 0 auto;
  align-self: stretch;
  background: #fee2e2;
  color: #991b1b;
  border-radius: 0;
  min-width: 5.5rem;
}