:root {
  --bg: #f4f7ff;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #4b5563;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --border: #d1d5db;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 16px;
}

.card {
  width: min(520px, 100%);
  background: var(--card);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(17, 24, 39, 0.12);
}

h1 {
  margin: 0 0 8px;
  font-size: 1.6rem;
}

.description {
  margin: 0 0 20px;
  color: var(--muted);
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

input {
  width: 100%;
  font-size: 1.2rem;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
}

input:focus {
  outline: 2px solid color-mix(in srgb, var(--primary), white 60%);
  border-color: var(--primary);
}

.error {
  min-height: 1.5em;
  margin: 8px 0 12px;
  color: var(--danger);
  font-size: 0.95rem;
}

button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border-radius: 10px;
  border: none;
  padding: 11px 16px;
  font-size: 1rem;
  cursor: pointer;
}

.primary {
  width: 100%;
  background: var(--primary);
  color: white;
  font-weight: 600;
}

.primary:hover {
  background: var(--primary-dark);
}

.qr-container {
  place-items: stretch;
  padding: 10px;
}

.qr-minimal {
  width: 100%;
  min-height: calc(100dvh - 20px);
  display: flex;
  flex-direction: column;
}

.qr-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 2px 8px;
}

.id-only {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.icon-button {
  padding: 4px 10px;
  border-radius: 999px;
  background: #fee2e2;
  color: #7f1d1d;
  font-size: 1.25rem;
  line-height: 1;
}

.qr-stage {
  flex: 1;
  display: grid;
  place-items: center;
  touch-action: none;
  overflow: visible;
}

.qr-box {
  transform-origin: center;
  transition: transform 0.08s linear;
  will-change: transform;
}

.qr-box img,
.qr-box canvas {
  display: block;
  max-width: none;
  height: auto;
}

@media (min-width: 700px) {
  .card {
    padding: 28px;
  }

  h1 {
    font-size: 1.9rem;
  }

  .id-only {
    font-size: 1.25rem;
  }
}