/* ---------- Base ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(135deg, #ffffff, #e8f0ff);
  color: #111;
  transition: background 0.4s, color 0.4s;
}

/* ---------- Header ---------- */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.logo {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.8rem;
  color: #007bff;
  letter-spacing: 1px;
}

.header-buttons {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.header-buttons button {
  background: rgba(0, 0, 0, 0.07);
  border: none;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, transform 0.2s;
}
.header-buttons button:hover {
  background: #007bff;
  color: #fff;
  transform: scale(1.05);
}

/* ---------- Toggle Switch ---------- */
.toggle-wrapper {
  position: relative;
}

.toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 60px;
  height: 28px;
  background: #d1d1d1;
  border-radius: 50px;
  padding: 0 6px;
  cursor: pointer;
  transition: background 0.4s;
}

.toggle .sun, .toggle .moon {
  font-size: 1rem;
}

#theme-toggle {
  display: none;
}

#theme-toggle:checked + .toggle {
  background: linear-gradient(135deg, #6a00ff, #9c67f8);
}
#theme-toggle:checked + .toggle .sun {
  opacity: 0.3;
}
#theme-toggle:checked + .toggle .moon {
  opacity: 1;
}

/* ---------- Card ---------- */
.card {
  width: 90%;
  max-width: 400px;
  margin: auto;
  padding: 2rem;
  border-radius: 20px;
  backdrop-filter: blur(15px);
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  text-align: center;
  transition: background 0.4s, color 0.4s;
}

.card h2 {
  margin-bottom: 1rem;
  font-weight: 600;
}

.card input[type="text"] {
  width: 100%;
  padding: 0.7rem;
  border: 1px solid #ccc;
  border-radius: 10px;
  font-size: 1rem;
  margin-bottom: 1rem;
  outline: none;
  transition: border 0.3s;
}
.card input[type="text"]:focus {
  border-color: #007bff;
}

.color-picker {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

button {
  padding: 0.7rem 1.2rem;
  background: #007bff;
  color: #fff;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 500;
  transition: background 0.3s, transform 0.2s;
}
button:hover {
  background: #005fcc;
  transform: scale(1.03);
}

.qr-container {
  margin: 1.5rem 0;
  display: flex;
  justify-content: center;
  min-height: 180px;
}

/* ---------- Footer ---------- */
footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.85rem;
  opacity: 0.7;
}

/* ---------- Dark Mode ---------- */
body.dark {
  background: linear-gradient(135deg, #0a0015, #3c0a68);
  color: #f0f0f0;
}

body.dark .logo {
  color: #bb86fc;
}

body.dark .card {
  background: rgba(30, 30, 30, 0.4);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

body.dark input[type="text"] {
  background: #111;
  border-color: #444;
  color: #fff;
}

body.dark button {
  background: #bb86fc;
}
body.dark button:hover {
  background: #9c67f8;
}

body.dark .header-buttons button {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}
body.dark .header-buttons button:hover {
  background: #bb86fc;
}