:root {
  /* Elite Dark Mode Palette */
  --bg-base: #0f1115;
  --bg-panel: rgba(22, 25, 31, 0.45);
  --bg-panel-solid: #16191f;
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Status Colors */
  --accent-emerald: #10b981;
  --accent-crimson: #ef4444;
  --accent-blue: #3b82f6;
  --accent-gold: #fbbf24;
  --accent-purple: #8b5cf6;
  
  /* Typography */
  --font-headings: 'Outfit', sans-serif;
  --font-numbers: 'Inter', sans-serif;
  
  /* Spacing & Radii */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

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

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-numbers);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  margin: 0;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
  padding: 2rem;
}

h1, h2, h3, h4, .outfit {
  font-family: var(--font-headings);
}

.glass-panel {
  background: var(--bg-panel);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.glass-panel:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.4);
  border-color: rgba(255, 255, 255, 0.12);
}

.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Form Elements */
input[type="number"], input[type="text"] {
  background: rgba(0,0,0,0.2);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-numbers);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  width: 100%;
  transition: border-color 0.2s;
}

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

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

.input-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

/* Progress Bars */
.progress-container {
  width: 100%;
  height: 8px;
  background: rgba(0,0,0,0.3);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-filler {
  height: 100%;
  background: var(--accent-emerald);
  transition: width 0.5s ease-out;
}

/* Checkboxes */
.checkbox-list {
  list-style: none;
}
.checkbox-list li {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.checkbox-list input[type="checkbox"] {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 4px;
  background: rgba(0,0,0,0.2);
  cursor: pointer;
  position: relative;
}
.checkbox-list input[type="checkbox"]:checked {
  background: var(--accent-emerald);
  border-color: var(--accent-emerald);
}
.checkbox-list input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  color: white;
  font-size: 14px;
  left: 3px;
  top: -1px;
}
.checkbox-list label {
  font-size: 0.95rem;
  color: var(--text-primary);
  cursor: pointer;
}

/* Alerts */
.alert-box {
  padding: 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  border-left: 4px solid transparent;
  display: none; /* hidden by default */
}
.alert-box.visible {
  display: flex;
  animation: slideIn 0.3s ease-out;
}
.alert-box.warning {
  background: rgba(239, 68, 68, 0.1);
  border-left-color: var(--accent-crimson);
}
.alert-box.info {
  background: rgba(59, 130, 246, 0.1);
  border-left-color: var(--accent-blue);
}
.alert-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.alert-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

/* Range Sliders */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  background: transparent;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 16px;
  width: 16px;
  border-radius: 50%;
  background: var(--accent-blue);
  cursor: pointer;
  margin-top: -6px;
}
input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 4px;
  cursor: pointer;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
}

.badge {
  background: rgba(255,255,255,0.1);
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge.optimal { background: rgba(16, 185, 129, 0.2); color: var(--accent-emerald); }
.badge.warning { background: rgba(239, 68, 68, 0.2); color: var(--accent-crimson); }

/* Tabs Navigation */
.tabs-nav {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-headings);
  font-size: 1rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--bg-panel);
  border-color: var(--border-color);
  color: var(--accent-blue);
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.tab-content {
  display: none !important;
  animation: fadeIn 0.3s ease-out;
}

/* Override default grid display for active tab */
.tab-content.active {
  display: grid !important;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Modals & Workouts */
.btn-workout {
  transform: translateY(0);
}

.btn-workout:not(.draft):hover {
  transform: translateY(-4px) !important;
  box-shadow: 0 8px 16px rgba(16, 185, 129, 0.3) !important;
}

.btn-workout.draft {
  opacity: 0.6;
}

#modal-workout[style*="display: flex"] {
  animation: fadeInModal 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeInModal {
  from { opacity: 0; backdrop-filter: blur(0px); }
  to { opacity: 1; backdrop-filter: blur(8px); }
}

.modal-content {
  animation: slideUpModal 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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