/* Variabili CSS per la gestione dei temi e contrasti WCAG */
:root {
  --bg-color: #f4f7f6;
  --card-bg: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --border-color: #cccccc;
  --input-bg: #ffffff;
  --qr-bg: #fafafa;
  --qr-border: #dddddd;
  --primary-color: #007bff;
  --primary-hover: #0056b3;
  --focus-ring: #007bff;
}

/* Tema Scuro */
[data-theme="dark"] {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --input-bg: #0f172a;
  --qr-bg: #0f172a;
  --qr-border: #334155;
  --primary-color: #3b82f6;
  --primary-hover: #60a5fa;
  --focus-ring: #60a5fa;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  transition: background-color 0.3s, color 0.3s;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.card {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  max-width: 440px;
  width: 100%;
  border: 1px solid var(--border-color);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 20px;
}

h1 {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Pulsante Toggle Tema */
.btn-theme-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.btn-theme-toggle:hover {
  border-color: var(--primary-color);
}

.form-group {
  text-align: left;
  margin-bottom: 15px;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  background-color: var(--input-bg);
  color: var(--text-primary);
  border-radius: 6px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  border-color: var(--primary-color);
}

.color-picker-group {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
  text-align: left;
}

.color-picker-group div {
  width: 48%;
}

input[type="color"] {
  width: 100%;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  background: transparent;
}

#qrcode-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 20px 0;
  padding: 15px;
  background-color: var(--qr-bg);
  border: 1px dashed var(--qr-border);
  border-radius: 8px;
  min-height: 180px;
}

#qrcode img, #qrcode canvas {
  max-width: 100%;
  height: auto;
}

.btn {
  width: 100%;
  padding: 12px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background-color 0.2s;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
}

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