:root {
  --primary: #00d4ff;
  --bg-dark: #1e1e1e;
  --bg-light: #f5f5f5;
  --text-dark: #333;
  --text-light: #fff;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
  --header-gradient: linear-gradient(135deg, var(--primary), #4a90e2);
  --header-height: 80px;
  --accent-1: #ff6b6b;
  --accent-2: #4ecdc4;
  --accent-3: #45b7d1;
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --settings-bg: rgba(255, 255, 255, 0.03);
  --input-bg: rgba(255, 255, 255, 0.06);
  --input-border: rgba(255, 255, 255, 0.1);
}

body {
  font-family: "Roboto", sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-dark);
  color: var(--text-light);
  transition: var(--transition);
}

body.light-theme {
  background-color: var(--bg-light);
  color: var(--text-dark);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.settings {
  background: rgba(255, 255, 255, 0.1);
  padding: 2rem;
  border-radius: 8px;
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1rem;
}

button {
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
}

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

.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}

.card {
  position: relative;
  background: linear-gradient(
    145deg,
    var(--settings-bg),
    rgba(255, 255, 255, 0.05)
  );
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.card:hover .card-chip::before {
  animation-duration: 1s;
}

.card-chip-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.card-chip {
  width: 45px;
  height: 35px;
  background: linear-gradient(135deg, #bec4c1, #8f9193);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.card-chip i {
  font-size: 1.2rem;
  color: rgba(0, 0, 0, 0.5);
}

.card-chip::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(transparent, rgba(255, 255, 255, 0.1));
  animation: chipGlow 2s ease-in-out infinite;
}

.card-brand {
  font-size: 2rem;
  color: var(--primary);
  filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.2));
}

.card-details {
  display: flex;
  justify-content: flex-start;
  gap: 2rem;
  margin: 1.5rem 0;
  padding-top: 1rem;
  border-top: 1px solid var(--glass-border);
}

.card-expiry,
.card-cvv {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.detail-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-light);
  opacity: 0.7;
}

.detail-label i {
  color: var(--primary);
}

.detail-value {
  font-family: "Roboto Mono", monospace;
  font-size: 1.2rem;
  color: var(--text-light);
  letter-spacing: 1px;
}

.validation-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  background: rgba(78, 216, 96, 0.2);
  border: 1px solid rgba(78, 216, 96, 0.3);
  border-radius: 4px;
  font-size: 0.9rem;
}

.validation-badge i {
  color: rgb(78, 216, 96);
}

@keyframes chipGlow {
  0%,
  100% {
    opacity: 0.5;
  }
  50% {
    opacity: 1;
  }
}

.light-theme .card {
  background: linear-gradient(145deg, #fff, #f0f0f0);
}

.card-number {
  font-size: 1.5rem;
  font-weight: bold;
  letter-spacing: 2px;
  margin-bottom: 1rem;
}

.copy-btn {
  padding: 0.5rem;
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}

.info {
  margin-top: 2rem;
  padding: 1rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
}

.hidden {
  display: none;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }

  .card-number {
    font-size: 1.2rem;
  }
}

.app-header {
  position: relative;
  width: 100%;
  margin: -2rem -2rem 2rem -2rem;
  padding: 2rem;
  background: linear-gradient(135deg, var(--primary), var(--accent-3));
  overflow: hidden;
  min-height: 160px;
}

.header-content {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--header-height);
}

.logo-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.card-icon {
  font-size: 2.5rem;
  color: var(--text-light);
  filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.3));
  animation: float 3s ease-in-out infinite;
}

.logo-container h1 {
  margin: 0;
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(to right, #fff, rgba(255, 255, 255, 0.8));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.header-pills {
  display: flex;
  gap: 0.8rem;
}

.pill {
  padding: 0.3rem 1rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  font-size: 0.8rem;
  backdrop-filter: blur(5px);
  animation: slideFadeIn 0.5s ease-out forwards;
}

.header-decorator {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
    circle at top right,
    rgba(255, 255, 255, 0.2) 0%,
    transparent 60%
  );
  animation: gradientShift 15s ease infinite;
}

.header-shapes .shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.4;
}

.shape-1 {
  background: var(--accent-1);
  width: 150px;
  height: 150px;
  top: -50px;
  right: 10%;
  animation: morphShape 15s ease-in-out infinite;
}

.shape-2 {
  background: var(--accent-2);
  width: 100px;
  height: 100px;
  bottom: -20px;
  left: 20%;
  animation: morphShape 20s ease-in-out infinite reverse;
}

.shape-3 {
  background: var(--accent-3);
  width: 120px;
  height: 120px;
  top: 20%;
  left: 5%;
  animation: morphShape 17s ease-in-out infinite;
}

.header-controls {
  display: flex;
  gap: 1rem;
}

#themeToggle {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(5px);
  transition: transform 0.3s ease;
}

#themeToggle:hover {
  transform: rotate(45deg);
  background: rgba(255, 255, 255, 0.3);
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes gradientShift {
  0% {
    transform: translateX(-50%) translateY(-50%) rotate(0deg);
  }
  50% {
    transform: translateX(50%) translateY(50%) rotate(180deg);
  }
  100% {
    transform: translateX(-50%) translateY(-50%) rotate(360deg);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes morphShape {
  0%,
  100% {
    border-radius: 50%;
    transform: rotate(0deg) scale(1);
  }
  50% {
    border-radius: 60% 40% 70% 30%;
    transform: rotate(180deg) scale(1.1);
  }
}

@keyframes slideFadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }

  .card-number {
    font-size: 1.2rem;
  }
}

@media (max-width: 768px) {
  .app-header {
    padding: 1.5rem;
    min-height: 140px;
  }

  .logo-container h1 {
    font-size: 1.8rem;
  }

  .card-icon {
    font-size: 2rem;
  }

  .header-pills {
    flex-wrap: wrap;
  }
}

@media (max-width: 600px) {
  .app-header {
    padding: 1rem;
    margin: -1rem -1rem 1rem -1rem;
  }

  .logo-container h1 {
    font-size: 1.5rem;
  }

  .logo-container i {
    font-size: 1.5rem;
  }
}

.light-theme .app-header {
  background: var(--header-gradient);
}

.settings-wrapper {
  position: relative;
  margin-bottom: 3rem;
}

.settings-container {
  background: var(--settings-bg);
  border-radius: 16px;
  padding: 2rem;
  backdrop-filter: blur(10px);
  border: 1px solid var(--input-border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.settings-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.settings-header i {
  font-size: 1.5rem;
  color: var(--primary);
}

.settings-header h2 {
  margin: 0;
  font-size: 1.5rem;
  background: linear-gradient(to right, var(--primary), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.setting-item label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-light);
  opacity: 0.8;
}

.setting-item select,
.setting-item input[type="number"] {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 0.8rem;
  color: var(--text-light);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.quantity-control {
  display: flex;
  align-items: center;
  background: var(--input-bg);
  border-radius: 8px;
  border: 1px solid var(--input-border);
  overflow: hidden;
}

.quantity-btn {
  background: transparent;
  border: none;
  color: var(--primary);
  width: 40px;
  height: 40px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.quantity-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.quantity-control input {
  width: 60px;
  text-align: center;
  border: none;
  background: transparent;
  color: var(--text-light);
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--input-bg);
  transition: 0.4s;
  border-radius: 34px;
  border: 1px solid var(--input-border);
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 3px;
  background-color: var(--primary);
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--accent-2);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.generate-btn {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--accent-2));
  color: var(--text-dark);
  padding: 1rem;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.2);
}

.generate-btn i {
  font-size: 1.2rem;
}

@media (max-width: 768px) {
  .settings-container {
    padding: 1.5rem;
  }

  .settings-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.output-wrapper {
  position: relative;
  margin-bottom: 3rem;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.output-header h2 {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin: 0;
  font-size: 1.5rem;
  background: linear-gradient(to right, var(--primary), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.control-btn {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-light);
  padding: 0.8rem 1.2rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  backdrop-filter: blur(5px);
  transition: all 0.3s ease;
}

.control-btn:hover {
  background: var(--glass-border);
  transform: translateY(-2px);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card {
  position: relative;
  background: linear-gradient(
    145deg,
    var(--settings-bg),
    rgba(255, 255, 255, 0.05)
  );
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--primary), var(--accent-2));
}

.card-number {
  font-size: 1.8rem;
  font-family: "Roboto Mono", monospace;
  margin-bottom: 1rem;
  background: linear-gradient(to right, #fff, rgba(255, 255, 255, 0.8));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.card-type {
  font-size: 0.9rem;
  color: var(--text-light);
  opacity: 0.7;
  margin-bottom: 1.5rem;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.copy-btn {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--primary);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.copy-btn:hover {
  background: var(--glass-border);
  transform: scale(1.05);
}

.copy-feedback {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  background: var(--accent-2);
  color: var(--text-dark);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-size: 0.9rem;
  animation: fadeInOut 2s ease forwards;
}

@keyframes fadeInOut {
  0% {
    opacity: 0;
    transform: translateY(10px);
  }
  20% {
    opacity: 1;
    transform: translateY(0);
  }
  80% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-10px);
  }
}

.info-wrapper {
  position: relative;
  margin-bottom: 2rem;
}

.info-container {
  background: var(--settings-bg);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  border: 1px solid var(--input-border);
  overflow: hidden;
}

.info-toggle {
  width: 100%;
  padding: 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.toggle-content {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1.2rem;
  font-weight: 600;
}

.toggle-content i {
  color: var(--primary);
  font-size: 1.4rem;
}

.toggle-arrow {
  transition: transform 0.3s ease;
}

.info-toggle[aria-expanded="true"] .toggle-arrow {
  transform: rotate(180deg);
}

.info-content {
  padding: 0 1.5rem 1.5rem;
  transform-origin: top;
  transition: all 0.3s ease;
}

.info-content.hidden {
  display: none;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.info-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.3s ease;
}

.info-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.1);
}

.info-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--accent-2));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.info-icon i {
  font-size: 1.5rem;
  color: var(--text-dark);
}

.info-card h3 {
  font-size: 1.2rem;
  margin: 0 0 0.8rem;
  background: linear-gradient(to right, var(--primary), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.info-card p {
  margin: 0;
  line-height: 1.5;
  opacity: 0.8;
}

.disclaimer-card {
  background: linear-gradient(135deg, var(--accent-1), var(--primary));
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.disclaimer-icon {
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.disclaimer-icon i {
  font-size: 1.5rem;
  color: var(--text-light);
}

.disclaimer-content h3 {
  margin: 0 0 0.5rem;
  color: var(--text-light);
}

.disclaimer-content p {
  margin: 0;
  color: var(--text-light);
  opacity: 0.9;
}

@media (max-width: 768px) {
  .info-grid {
    grid-template-columns: 1fr;
  }

  .disclaimer-card {
    flex-direction: column;
    text-align: center;
  }
}

.app-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--glass-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-light);
  opacity: 0.8;
}

.footer-info p {
  margin: 0;
}

.footer-info i {
  color: var(--accent-1);
}

.footer-divider {
  color: var(--glass-border);
}

.footer-link {
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--accent-2);
  transform: translateY(-2px);
}

@media (max-width: 600px) {
  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .footer-info {
    flex-direction: column;
    gap: 0.5rem;
  }

  .footer-divider {
    display: none;
  }
}

.validation-wrapper {
  position: relative;
  margin-bottom: 3rem;
}

.validation-container {
  background: var(--settings-bg);
  border-radius: 16px;
  padding: 2rem;
  backdrop-filter: blur(10px);
  border: 1px solid var(--input-border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.validation-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.validation-header i {
  font-size: 1.5rem;
  color: var(--primary);
}

.validation-header h2 {
  margin: 0;
  font-size: 1.5rem;
  background: linear-gradient(to right, var(--primary), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.validation-input-group {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.validation-input-group input {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 0.8rem 1.2rem;
  color: var(--text-light);
  font-size: 1.1rem;
  font-family: "Roboto Mono", monospace;
  letter-spacing: 1px;
  transition: all 0.3s ease;
}

.validation-input-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.1);
}

.validate-btn {
  background: linear-gradient(135deg, var(--primary), var(--accent-2));
  color: var(--text-dark);
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.validate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.2);
}

.validation-result {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  border-radius: 8px;
  animation: fadeIn 0.3s ease-out;
}

.validation-result.valid {
  background: rgba(78, 216, 96, 0.1);
  border: 1px solid rgba(78, 216, 96, 0.2);
}

.validation-result.invalid {
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.2);
}

.result-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.validation-result.valid .result-icon {
  background: rgba(78, 216, 96, 0.2);
}

.validation-result.invalid .result-icon {
  background: rgba(255, 107, 107, 0.2);
}

.validation-result.valid .result-icon i {
  color: rgb(78, 216, 96);
}

.validation-result.invalid .result-icon i {
  color: rgb(255, 107, 107);
}

.result-message {
  font-size: 1rem;
  color: var(--text-light);
}

@media (max-width: 600px) {
  .validation-input-group {
    flex-direction: column;
  }

  .validate-btn {
    width: 100%;
    justify-content: center;
  }
}