.card {
  background-color: var(--md-surface);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(var(--md-outline-rgb), 0.1);
  box-shadow: 0 1px 3px var(--md-shadow);
  border-radius: 24px;
  overflow: hidden;
  margin: 24px 0;
  padding: 24px;
  transition: transform var(--animation-medium) ease, box-shadow var(--animation-medium) ease;
}

.card:hover {
  box-shadow: 0 4px 8px var(--md-shadow);
  transform: translateY(-2px);
  transition: all var(--animation-medium) ease;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 1px;
  margin-bottom: 16px;
  border-radius: 24px;
  overflow: hidden;
  background-color: var(--md-surface-variant);
  padding: 3px;
}

.tab-button {
  border: none;
  background-color: transparent;
  padding: 8px 16px;
  font-family: var(--md-font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--md-on-surface-variant);
  cursor: pointer;
  transition: all 0.2s ease;
  border-radius: 20px;
}

.tab-button.active {
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Feature tag */
.feature-tag {
  display: inline-flex;
  align-items: center;
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
  padding: 6px 12px;
  border-radius: 16px;
  font-size: 14px;
  margin-bottom: 16px;
  gap: 6px;
}

/* Form grid */
.form-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

@media (max-width: 768px) {
  .form-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

/* Material Design 3 Button styles */
.md-button {
  font-family: var(--md-font-body);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.1px;
  text-transform: uppercase;
  padding: 10px 24px;
  border-radius: 100px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--animation-fast) ease;
  position: relative;
  overflow: hidden;
}

.md-button::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  background: rgba(255, 255, 255, 0.5);
  opacity: 0;
  border-radius: 100%;
  transform: scale(1, 1) translate(-50%);
  transform-origin: 50% 50%;
}

.md-button:active::after {
  opacity: 0.4;
  transform: scale(30, 30) translate(-50%);
  transition: transform var(--animation-medium) ease-out, opacity var(--animation-medium) ease-out;
}

.md-button-filled {
  background-color: var(--md-primary);
  color: var(--md-on-primary);
}

.md-button-filled:hover {
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px 1px rgba(0, 0, 0, 0.15);
  filter: brightness(1.05);
}

.md-button-outlined {
  background-color: transparent;
  color: var(--md-primary);
  border: 1px solid var(--md-outline);
}

.md-button-outlined:hover {
  background-color: rgba(103, 80, 164, 0.05);
}

.md-button .material-symbols-outlined {
  font-size: 18px;
}

/* Icon button */
.icon-button {
  background: none;
  border: none;
  color: var(--md-on-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: background-color var(--animation-fast) ease;
}

.icon-button:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Input styles */
.md-textarea, .md-input, .md-select {
  font-family: var(--md-font-body);
  width: 100%;
  padding: 16px;
  border: 1px solid var(--md-outline-variant);
  border-radius: 12px;
  background-color: var(--md-surface);
  color: var(--md-on-surface);
  font-size: 16px;
  transition: border var(--animation-fast) ease, box-shadow var(--animation-fast) ease;
}

.md-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
}

.md-textarea {
  resize: vertical;
  min-height: 120px;
}

.md-textarea:focus, .md-input:focus, .md-select:focus {
  outline: none;
  border-color: var(--md-primary);
  box-shadow: 0 0 0 2px var(--md-primary-container);
}

.input-container {
  position: relative;
  margin-bottom: 24px;
}

.input-label {
  position: absolute;
  top: -8px;
  left: 12px;
  background-color: var(--md-surface);
  padding: 0 4px;
  font-size: 12px;
  color: var(--md-primary);
}

.button-group {
  display: flex;
  gap: 12px;
  margin: 16px 0;
  flex-wrap: wrap;
}

/* Chips */
.chip-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px;
  border: 1px solid var(--md-outline-variant);
  border-radius: 12px;
  background-color: var(--md-surface);
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  background-color: var(--md-surface-variant);
  color: var(--md-on-surface-variant);
  border-radius: 16px;
  font-size: 14px;
  gap: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.chip.selected {
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.chip-close {
  font-size: 16px;
  cursor: pointer;
}

/* User badge */
.user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  background-color: rgba(255, 255, 255, 0.1);
  padding: 4px 10px;
  border-radius: 20px;
}

.user-avatar {
  width: 24px;
  height: 24px;
  background-color: var(--md-surface);
  color: var(--md-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-size: 12px;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: none;
  color: var(--md-on-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: background-color var(--animation-fast) ease;
}

.theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Compound card with flip effect */
.compound-card {
  height: 320px;
  perspective: 1000px;
  cursor: pointer;
}

.compound-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transform-style: preserve-3d;
  box-shadow: 0 1px 3px var(--md-shadow);
  border-radius: 24px;
}

.compound-card:hover .compound-card-inner {
  box-shadow: 0 4px 8px var(--md-shadow);
}

.compound-card.flipped .compound-card-inner {
  transform: rotateY(180deg);
}

.compound-front, .compound-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 24px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.compound-front {
  background-color: var(--md-surface);
  color: var(--md-on-surface);
  border: 1px solid var(--md-outline-variant);
}

.compound-back {
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 24px;
  border: 1px solid var(--md-primary);
}

.compound-image {
  flex: 1;
  background-color: white;
  padding: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color var(--animation-medium) ease;
}

.compound-image img {
  max-width: 100%;
  max-height: 200px;
}

.compound-hint {
  background-color: var(--md-surface-variant);
  color: var(--md-on-surface-variant);
  padding: 12px;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background-color var(--animation-medium) ease, color var(--animation-medium) ease;
}

.compound-name {
  font-family: var(--md-font-display);
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 16px;
  word-break: break-word;
  line-height: 1.3;
}

/* Badge for flip instructions */
.flip-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 4px var(--md-shadow);
  z-index: 1;
}

/* Settings subtitle */
.settings-subtitle {
  font-size: 18px;
  margin: 24px 0 16px;
  color: var(--md-on-surface);
  font-weight: 500;
}

/* Loading spinner */
.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--md-primary);
  animation: rotate 1s linear infinite;
}

/* FAB */
.fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--md-primary);
  color: var(--md-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 5px var(--md-shadow);
  cursor: pointer;
  transition: all var(--animation-fast) ease;
  border: none;
  z-index: 90;
}

.fab:hover {
  box-shadow: 0 6px 10px var(--md-shadow);
  transform: translateY(-2px);
}

/* Snackbar */
.snackbar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: #323232;
  color: white;
  padding: 16px 24px;
  border-radius: 4px;
  z-index: 1000;
  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.2);
  font-size: 14px;
  visibility: hidden;
  opacity: 0;
  transition: all 0.3s;
}

.snackbar.show {
  visibility: visible;
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
  backdrop-filter: blur(4px);
}

.modal-content {
  background-color: var(--md-surface);
  padding: 24px;
  border-radius: 24px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid var(--md-outline-variant);
}

.modal-title {
  font-size: 24px;
  margin-bottom: 16px;
  color: var(--md-on-surface);
  font-weight: 600;
}

.modal-close {
  color: var(--md-on-surface-variant);
  float: right;
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
  transition: color var(--animation-fast) ease;
}

.modal-close:hover {
  color: var(--md-primary);
}

.modal-body {
  margin-bottom: 20px;
}

.code-block {
  background-color: var(--md-surface-variant);
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  font-family: var(--md-font-code);
  font-size: 14px;
  color: var(--md-on-surface-variant);
  line-height: 1.5;
}

/* Quiz styles */
.quiz-image {
  background-color: white;
  padding: 16px;
  border-radius: 8px;
  margin: 20px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
}

.quiz-image img {
  max-width: 100%;
  max-height: 200px;
}

.quiz-result {
  margin-top: 16px;
  padding: 12px;
  border-radius: 8px;
  font-weight: 500;
}

.quiz-result.correct {
  background-color: rgba(46, 125, 50, 0.1);
  color: var(--md-success);
  border: 1px solid var(--md-success);
}

.quiz-result.incorrect {
  background-color: rgba(179, 38, 30, 0.1);
  color: var(--md-error);
  border: 1px solid var(--md-error);
}

.quiz-streak {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background-color: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 14px;
  font-weight: 500;
  margin: 0 0 16px 0;
}

/* Theme selector styles */
.theme-selector {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--md-outline-variant);
  border-radius: 12px;
  background-color: var(--md-surface);
}

.theme-chips {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
}

.theme-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border-radius: 12px;
  background-color: var(--md-surface-variant);
  color: var(--md-on-surface-variant);
  cursor: pointer;
  transition: all var(--animation-fast) ease;
  border: 2px solid transparent;
}

.theme-chip:hover {
  background-color: var(--md-surface-1);
}

.theme-chip.selected {
  background-color: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-color: var(--md-primary);
}

.theme-chip .material-symbols-outlined {
  font-size: 20px;
}

/* Custom functional group input */
.custom-group-input {
  display: flex;
  gap: 8px;
  align-items: center;
}

.custom-group-input .md-input {
  flex: 1;
}

.custom-group-input .md-button {
  height: 48px;
  padding: 0 16px;
}