:root {
  --bg-primary: #0f0f23;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --text-primary: #e94560;
  --text-secondary: #a0a0a0;
  --accent: #e94560;
  --success: #00d9ff;
  --rest: #4a4a6a;
  --upper: #ff6b6b;
  --lower: #4ecdc4;
  --border: #2a2a4a;
}

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

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

.app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 240px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  z-index: 100;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
}

.week-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.day-nav {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}

.day-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 10px;
  text-decoration: none;
  color: #fff;
  margin-bottom: 6px;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.day-link:hover {
  background: rgba(255,255,255,0.05);
}

.day-link.active {
  background: var(--bg-card);
  border-left-color: var(--accent);
}

.day-link.rest { border-left-color: var(--rest); }
.day-link.upper { border-left-color: var(--upper); }
.day-link.lower { border-left-color: var(--lower); }

.day-label {
  font-weight: 700;
  font-size: 0.9rem;
  min-width: 36px;
}

.day-type {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Content */
.content {
  flex: 1;
  margin-left: 240px;
  min-height: 100vh;
}

.mobile-header {
  display: none;
  padding: 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  align-items: center;
  gap: 12px;
}

.menu-toggle {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
}

.panels {
  padding: 20px;
  max-width: 800px;
}

/* Day Panels */
.day-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.day-panel.active {
  display: block;
}

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

.day-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.day-header h2 {
  font-size: 1.6rem;
  font-weight: 700;
}

.day-header .date {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 1rem;
  margin-left: 8px;
}

.rest-badge {
  background: var(--rest);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.workout-badge {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.workout-badge:contains("Upper") { background: var(--upper); }
.workout-badge:contains("Lower") { background: var(--lower); }

/* Rest Day */
.rest-content {
  background: var(--bg-card);
  padding: 30px;
  border-radius: 16px;
  text-align: center;
}

.rest-content p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin: 10px 0;
}

/* Cardio Banner */
.cardio-banner {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-secondary) 100%);
  border: 1px solid var(--border);
  padding: 16px 20px;
  border-radius: 12px;
  margin-bottom: 20px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Exercise Cards */
.exercise-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
}

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

.exercise-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.exercise-header .weight {
  color: var(--accent);
  font-weight: 700;
}

.exercise-header .target {
  background: var(--bg-secondary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Sets */
.sets {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.set-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  border: 2px solid transparent;
}

.set-checkbox:hover {
  border-color: var(--accent);
}

.set-checkbox input {
  display: none;
}

.set-checkbox span {
  font-size: 0.9rem;
  font-weight: 500;
}

.set-checkbox.checked {
  background: var(--success);
  color: var(--bg-primary);
}

.set-checkbox.checked span {
  text-decoration: line-through;
  opacity: 0.7;
}

/* Complete Button */
.workout-complete {
  margin-top: 24px;
  text-align: center;
}

.complete-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 16px 32px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.complete-btn:hover {
  transform: scale(1.05);
}

.complete-btn.completed {
  background: var(--success);
  color: var(--bg-primary);
}

/* Mobile */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .content {
    margin-left: 0;
  }
  
  .mobile-header {
    display: flex;
  }
  
  .panels {
    padding: 16px;
  }
  
  .day-header h2 {
    font-size: 1.3rem;
  }
  
  .exercise-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .sets {
    justify-content: center;
  }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}