:root {
  /* Colors - Light Theme (Default) */
  --color-primary: #22C55E;
  --color-primary-hover: #16A34A;
  --color-background: #FAFAFA;
  --color-card: #FFFFFF;
  --color-border: #E5E7EB;
  --color-danger: #EF4444;
  --color-danger-hover: #DC2626;
  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-shadow: rgba(0, 0, 0, 0.08);

  /* Fonts */
  --font-primary: 'Space Grotesk', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Border Radius */
  --radius-input: 12px;
  --radius-button: 12px;
  --radius-card: 18px;
  --radius-dialog: 20px;
  
  /* Transitions */
  --transition-fast: 200ms ease;
}

[data-theme="dark"] {
  --color-primary: #22C55E;
  --color-primary-hover: #16A34A;
  --color-background: #09090B;
  --color-card: #18181B;
  --color-border: #27272A;
  --color-text: #FFFFFF;
  --color-text-secondary: #A1A1AA;
  --color-shadow: rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* Layout */
.header {
  position: sticky;
  top: 0;
  height: 72px;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  z-index: 10;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.header-container {
  max-width: 720px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 18px;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.main-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Cards */
.card {
  background-color: var(--color-card);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: 0 8px 32px var(--color-shadow);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

/* Inputs */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.input-group label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

input[type="text"] {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-input);
  border: 1px solid var(--color-border);
  background-color: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: 16px;
  outline: none;
  transition: border-color var(--transition-fast);
}

#secret-input {
  text-transform: uppercase;
}

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

/* Buttons */
.actions {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 24px;
  border-radius: var(--radius-button);
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.btn:active {
  transform: scale(0.98);
}

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

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

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

.btn-danger-outline {
  background-color: transparent;
  color: var(--color-danger);
  border: 1px solid var(--color-danger);
}

.btn-danger-outline:hover {
  background-color: var(--color-danger);
  color: #FFF;
}

.icon-button {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background-color: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.icon-button:hover {
  background-color: var(--color-border);
  color: var(--color-text);
}

/* Generate Section / OTP Result */
.hidden {
  display: none !important;
}

.otp-result-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  margin-top: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.otp-display {
  display: flex;
  align-items: center;
  gap: 16px;
}

.otp-value {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

/* Countdown Ring */
.countdown-wrapper {
  position: relative;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.countdown-ring {
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 6;
}

.ring-progress {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 6;
  stroke-dasharray: 100;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear;
  stroke-linecap: round;
}

.countdown-text {
  position: absolute;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

/* Saved Accounts Section */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.vault-actions {
  display: flex;
  gap: 8px;
}

.search-box {
  position: relative;
  margin-bottom: 24px;
}

.search-box .search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-secondary);
  width: 18px;
  height: 18px;
}

.search-box input {
  padding-left: 44px;
}

.accounts-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.account-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-card);
  padding: 24px;
  border-radius: var(--radius-card);
  box-shadow: 0 4px 12px var(--color-shadow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  cursor: default;
}

.account-item:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 24px var(--color-shadow);
}

.account-info {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
}

.account-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--color-background);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  overflow: hidden;
}

.brand-img {
  width: 24px;
  height: 24px;
}

.brand-fallback {
  font-size: 20px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.account-details h3 {
  font-size: 16px;
  margin-bottom: 2px;
}

.account-details p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.account-otp {
  display: flex;
  align-items: center;
  gap: 24px;
}

.account-otp-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 2px;
  font-variant-numeric: tabular-nums;
}

.account-actions {
  display: flex;
  gap: 8px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.account-item:hover .account-actions {
  opacity: 1;
}

@media (max-width: 768px) {
  .account-item {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }
  .account-otp {
    justify-content: space-between;
  }
  .account-actions {
    opacity: 1;
    justify-content: flex-end;
  }
  .card {
    padding: 24px;
  }
  .otp-value {
    font-size: 42px;
  }
}

/* Extra small devices (phones, 480px and down) */
@media (max-width: 480px) {
  .card {
    padding: 20px;
  }
  .actions {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
  .otp-value {
    font-size: 32px;
  }
  .otp-display {
    gap: 8px;
  }
  .account-otp-value {
    font-size: 24px;
  }
  .modal-content {
    padding: 24px 20px;
  }
  .modal-footer {
    flex-direction: column-reverse;
  }
  .modal-footer .btn {
    width: 100%;
  }
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 64px 0;
  color: var(--color-text-secondary);
  text-align: center;
  gap: 16px;
}

.empty-state .empty-icon {
  width: 48px;
  height: 48px;
  opacity: 0.5;
}

/* Footer */
.footer {
  text-align: center;
  padding: 48px 16px;
  color: var(--color-text-secondary);
  font-size: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.footer-icon {
  width: 24px;
  height: 24px;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 480px;
  z-index: 51;
  padding: 32px;
  border-radius: var(--radius-dialog);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.modal-body {
  margin-bottom: 32px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background-color: var(--color-text);
  color: var(--color-background);
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  animation: slideUp 0.3s ease forwards;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toast.fade-out {
  animation: fadeOut 0.3s ease forwards;
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

@media (max-width: 768px) {
  .card {
    padding: 24px;
  }
  .otp-value {
    font-size: 42px;
  }
}