@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700&display=swap');

:root {
  --accent-color: #0080ff;
  --base-color: #fff;
  --text-color: #000;
  --input-color: #fff;
}

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

html {
  font-family: 'Poppins', sans-serif;
  font-size: 16px;
  color: var(--text-color);
  text-align: center;
}

.container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.wrapper {
  flex: 0 0 60%;
  background: var(--base-color);
  padding: 10px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.background {
  flex: 0 0 40%;
  position: relative;
  overflow: hidden;
}

.background a {
  position: absolute;
  inset: 0;
  display: block;
  opacity: 0;
  transition: opacity 2.5s ease-in-out;
  pointer-events: none;
  z-index: 0;
}

.background a.active {
  opacity: 1;
  z-index: 2;
  pointer-events: auto;
}

.background a.fading-out {
  opacity: 0;
  z-index: 1;
}

.background img, .bg-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

h1 {
  font-size: 3rem;
  font-weight: 700;
  text-transform: uppercase;
}

form {
  width: min(400px, 100%);
  margin: 20px 0 50px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.input-group {
  display: flex;
  width: 100%;
  border: 2px solid var(--accent-color);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.input-group:focus-within {
  border-color: var(--text-color);
}

form label, .input-group button {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: var(--accent-color);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  border: none;
  transition: background 0.2s ease, color 0.2s ease;
  color: var(--text-color);
}

form label i, .input-group button i {
  color: currentColor;
}

form input {
  flex: 1;
  min-width: 0;
  height: 50px;
  padding: 0 1em;
  font: inherit;
  border: none;
  outline: none;
  background: var(--input-color);
}

.input-group button {
  cursor: pointer;
}

.input-group button:hover,
.input-group button:focus {
  background: var(--text-color);
  color: var(--base-color);
}

.input-group.correct {
  border-color: #0f0;
}

.input-group.correct label,
.input-group.correct button {
  background: #0f0;
  color: var(--text-color);
}

.input-group.incorrect {
  border-color: #f00;
}

.input-group.incorrect label,
.input-group.incorrect button {
  background: #f00;
  color: var(--base-color);
}

#submit {
  margin-top: 10px;
  padding: .85em 4em;
  border: none;
  border-radius: 1000px;
  background: var(--accent-color);
  color: var(--base-color);
  font: inherit;
  font-weight: 600;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

#submit:hover {
  background: var(--text-color);
  color: var(--base-color);
}

#code {
  color: transparent;
  user-select: text;
  -webkit-user-select: text;
  white-space: pre-wrap;
  text-align: center;
  font-size: 1rem;
  overflow: auto;
}

@media (max-width: 768px) {
  .wrapper { flex: 0 0 65%; }
  .background { flex: 0 0 35%; }
}

@media (max-width: 480px) {
  .wrapper { flex: 0 0 70%; }
  .background { flex: 0 0 30%; }
  h1 { font-size: 2.5rem; }
}