:root {
  /* Colors */
  --pastel-green: #98d8b1;
  --pastel-green-hover: #7ec99a;
  --pastel-purple: #aa96da;
  --pastel-purple-hover: #9785c9;

  /* Dark mode colors */
  --dark-bg: #1a1a1a;
  --dark-secondary: #3f3f3f;
  --dark-border: #404040;
  --dark-text: #e0e0e0;
  --dark-text-secondary: #b0b0b0;
}

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

a {
  color: #e0e0e0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  line-height: 1.5;
  color: var(--dark-text);
  background-color: var(--dark-bg);
  margin: 0;
  padding: 20px;
  transition: all 0.3s ease;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px;
}

h1 {
  font-size: 2rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--dark-text);
}

.input-group {
  width: 100%;
  max-width: 500px;
  margin: 0 auto 1.5rem;
}

.toggle-container {
  margin-bottom: 1rem;
  text-align: center;
}

.toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  justify-content: center;
  width: auto;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-label {
  margin-right: 10px;
  color: var(--dark-text);
}

.slider {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 24px;
  background-color: var(--dark-secondary);
  border-radius: 24px;
  transition: 0.4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: 0.4s;
}

input:checked + .toggle-label + .slider {
  background-color: var(--pastel-green);
}

input:checked + .toggle-label + .slider:before {
  transform: translateX(24px);
}

input[type="text"] {
  display: block;
  width: 100%;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--dark-text);
  background-color: var(--dark-secondary);
  background-clip: padding-box;
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  transition: all 0.15s ease-in-out;
  margin-bottom: 1rem;
}

input[type="text"]:focus {
  border-color: var(--pastel-blue);
  outline: 0;
  box-shadow: 0 0 0 0.25rem rgba(168, 216, 234, 0.25);
}

button {
  display: inline-block;
  width: 100%;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: none;
  border-radius: 4px;
  color: var(--dark-bg);
  background-color: var(--pastel-purple);
  transition: all 0.15s ease-in-out;
}

button:hover {
  background-color: var(--pastel-purple-hover);
}

button:focus {
  outline: 0;
  box-shadow: 0 0 0 0.25rem rgba(168, 216, 234, 0.25);
}

#qrOutput {
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  padding: 1.5rem;
  background-color: var(--dark-secondary);
  border: 1px solid var(--dark-border);
  border-radius: 4px;
  text-align: center;
}

#qrOutput img {
  max-width: 100%;
  height: auto;
  background-color: var(--dark-secondary);
}

#qrOutput button {
  margin-top: 1rem;
  background-color: var(--pastel-green);
  color: var(--dark-bg);
}

#qrOutput button:hover {
  background-color: var(--pastel-green-hover);
}

/* Mobile (under 576px) */
@media (max-width: 575.98px) {
  body {
    padding: 10px;
  }

  h1 {
    font-size: 1.5rem;
  }

  .container {
    padding: 10px;
  }

  #qrOutput {
    padding: 1rem;
  }
}

/* Tablet (576px to 992px) */
@media (min-width: 576px) and (max-width: 991.98px) {
  .container {
    max-width: 720px;
  }
}

/* Desktop (992px and above) */
@media (min-width: 992px) {
  .container {
    max-width: 960px;
  }
}

/* Footer */
.footer {
  text-align: center;
  padding: 20px 0;
  margin-top: 40px;
  color: var(--dark-text-secondary);
  font-size: 0.9rem;
}