:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #0f3460;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --accent: #4a6fa5;
  --accent-light: #6b8cbe;
  --accent-dark: #3a5a8a;
  --danger: #e74c3c;
  --danger-dark: #c0392b;
  --success: #27ae60;
  --border-radius: 12px;
  --transition: 0.2s ease;
}

[data-theme="green"] {
  --accent: #2d6a4f;
  --accent-light: #40916c;
  --accent-dark: #1b4332;
  --bg-card: #1b4332;
}

[data-theme="red"] {
  --accent: #9b2226;
  --accent-light: #bb3e42;
  --accent-dark: #7a1a1d;
  --bg-card: #5c1a1b;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

#app {
  max-width: 600px;
  margin: 0 auto;
  min-height: 100vh;
}

.page {
  display: none;
  min-height: 100vh;
}

.page.active {
  display: block;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background-color: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.app-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.icon-btn:active {
  transform: scale(0.95);
}

/* Workout List */
.workout-list {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.workout-card {
  background-color: var(--bg-card);
  border-radius: var(--border-radius);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.workout-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.workout-card:active {
  transform: translateY(0);
}

.workout-card-icon {
  width: 48px;
  height: 48px;
  background-color: var(--accent);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.workout-card-icon svg {
  width: 28px;
  height: 28px;
  color: var(--text-primary);
}

.workout-card-info {
  flex: 1;
  min-width: 0;
}

.workout-card-name {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.workout-card-details {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

.card-action-btn {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 10px;
  border-radius: 8px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-action-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.card-action-btn.delete:hover {
  background: var(--danger);
}

/* Empty State */
.empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  text-align: center;
}

.empty-state.visible {
  display: flex;
}

.empty-state p {
  margin-top: 16px;
  font-size: 1.1rem;
}

.empty-state .hint {
  font-size: 0.9rem;
  margin-top: 8px;
  opacity: 0.7;
}

/* Buttons */
.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  background-color: var(--bg-card);
  color: var(--text-primary);
}

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

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

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

.action-btn.danger {
  background-color: var(--danger);
}

.action-btn.danger:hover {
  background-color: var(--danger-dark);
}

.small-btn {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  background-color: var(--accent);
  color: var(--text-primary);
}

.small-btn:hover {
  background-color: var(--accent-light);
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 24px;
  max-width: 400px;
  width: 100%;
  text-align: center;
}

.modal-content h3 {
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.modal-content p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.modal-actions.import-actions {
  flex-direction: column;
}

.modal-actions.import-actions .action-btn {
  width: 100%;
  justify-content: center;
}

/* Form Elements */
input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: var(--transition);
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

input[type="color"] {
  width: 50px;
  height: 40px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: none;
}

label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 3px;
}

/* Utility */
.hidden {
  display: none !important;
}

@media (max-width: 480px) {
  .app-header {
    padding: 12px 16px;
  }
  
  .workout-list {
    padding: 16px;
  }
  
  .workout-card {
    padding: 14px 16px;
  }
}