:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #131b2e;
  --bg-card: #1a233a;
  --bg-card-hover: #222d4a;
  --border-color: #2a3656;
  --accent-primary: #38bdf8;
  --accent-secondary: #818cf8;
  --accent-glow: rgba(56, 189, 248, 0.25);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.2);
  --warning: #f59e0b;
  --danger: #ef4444;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --modal-overlay: rgba(0, 0, 0, 0.75);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --border-color: #cbd5e1;
  --accent-primary: #0284c7;
  --accent-secondary: #6366f1;
  --accent-glow: rgba(2, 132, 199, 0.2);
  --success: #059669;
  --success-glow: rgba(5, 150, 105, 0.15);
  --warning: #d97706;
  --danger: #dc2626;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #94a3b8;
  --modal-overlay: rgba(15, 23, 42, 0.6);
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 80px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.app-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 16px 14px;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  box-shadow: var(--shadow-card);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 22px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  color: #ffffff;
  box-shadow: 0 0 15px var(--accent-glow);
}

.app-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.app-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.header-right {
  display: flex;
  gap: 6px;
}

.icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition-fast);
}

.icon-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
}

/* Pre-Workout Collagen Banner */
.preworkout-banner {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(129, 140, 248, 0.15));
  border: 1px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-bottom: 14px;
  animation: pulseGlow 2s infinite ease-in-out;
}

.preworkout-banner.hidden {
  display: none;
}

@keyframes pulseGlow {
  0% { box-shadow: 0 0 8px rgba(56, 189, 248, 0.2); }
  50% { box-shadow: 0 0 18px rgba(56, 189, 248, 0.45); }
  100% { box-shadow: 0 0 8px rgba(56, 189, 248, 0.2); }
}

.preworkout-banner-inner {
  display: flex;
  align-items: center;
  gap: 12px;
}

.preworkout-icon {
  font-size: 1.8rem;
}

.preworkout-info {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.preworkout-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-primary);
}

.preworkout-info strong {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: 0.05em;
}

.preworkout-subtext {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Navigation Tabs */
.nav-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  background: var(--bg-secondary);
  padding: 6px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 16px;
}

.nav-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 4px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.nav-tab .tab-icon {
  font-size: 1.15rem;
}

.nav-tab.active {
  background: var(--bg-card);
  color: var(--accent-primary);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Tab Contents */
.tab-content {
  display: none;
  animation: fadeIn 0.2s ease-out;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Cards & Badges */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-card);
}

.section-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 8px;
}

.section-title-row h2 {
  font-size: 1.1rem;
  font-weight: 700;
}

.section-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.badge {
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 20px;
  font-weight: 700;
  text-transform: uppercase;
}

.badge-accent {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.badge-success {
  background: var(--success-glow);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Day Picker Grid */
.day-picker-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.day-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px 6px;
  text-align: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.day-btn .day-name {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-main);
}

.day-btn .day-focus {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.day-btn.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(129, 140, 248, 0.15));
  border-color: var(--accent-primary);
  box-shadow: 0 0 12px var(--accent-glow);
}

.day-btn.active .day-name {
  color: var(--accent-primary);
}

/* Active Workout Header Card */
.workout-header-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 14px;
}

.workout-title-row-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.workout-title-area h3 {
  font-size: 1.15rem;
  font-weight: 800;
}

.workout-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.workout-quick-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.stat-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px;
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.65rem;
  color: var(--text-subtle);
  text-transform: uppercase;
  font-weight: 700;
}

.stat-val {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--accent-primary);
}

/* Exercise Cards */
.exercise-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 12px;
  transition: var(--transition-fast);
}

.exercise-card.completed {
  border-color: rgba(16, 185, 129, 0.4);
  background: linear-gradient(to bottom, var(--bg-card), rgba(16, 185, 129, 0.05));
}

.ex-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
}

.ex-title-group h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.ex-tags {
  display: flex;
  gap: 6px;
  margin-top: 4px;
  flex-wrap: wrap;
  align-items: center;
}

.tag-badge {
  font-size: 0.65rem;
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.ex-demo-link {
  font-size: 0.68rem;
  color: var(--accent-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  background: rgba(56, 189, 248, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(56, 189, 248, 0.25);
  font-weight: 600;
}

.ex-demo-link:hover {
  text-decoration: underline;
  background: rgba(56, 189, 248, 0.2);
}

.ex-notes {
  font-size: 0.75rem;
  color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.08);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  border-left: 3px solid var(--accent-primary);
}

/* Sets Table */
.sets-table-wrapper {
  margin-bottom: 10px;
}

.sets-header {
  display: grid;
  grid-template-columns: 32px 1fr 1fr 1fr 42px;
  gap: 6px;
  font-size: 0.65rem;
  color: var(--text-subtle);
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 6px;
  text-align: center;
}

.set-row {
  display: grid;
  grid-template-columns: 32px 1fr 1fr 1fr 42px;
  gap: 6px;
  align-items: center;
  margin-bottom: 6px;
}

.set-num-badge {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  font-size: 0.72rem;
  font-weight: 700;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

.set-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  height: 34px;
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 0.82rem;
  font-weight: 600;
  width: 100%;
}

.set-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.set-check-btn {
  height: 34px;
  width: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-subtle);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.set-check-btn.checked {
  background: var(--success);
  color: #ffffff;
  border-color: var(--success);
  box-shadow: 0 0 10px var(--success-glow);
}

/* Pain Slider */
.pain-score-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  gap: 8px;
}

.pain-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.pain-slider {
  flex-grow: 1;
  accent-color: var(--accent-primary);
  height: 6px;
}

.pain-val-badge {
  font-size: 0.72rem;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 10px;
  min-width: 30px;
  text-align: center;
}

.pain-safe { background: rgba(16, 185, 129, 0.2); color: var(--success); }
.pain-warn { background: rgba(245, 158, 11, 0.2); color: var(--warning); }
.pain-danger { background: rgba(239, 68, 68, 0.2); color: var(--danger); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: inherit;
  font-weight: 700;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
  padding: 10px 16px;
  font-size: 0.85rem;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #ffffff;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1, #0284c7);
}

.btn-glow {
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

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

.btn-outline:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
}

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

.btn-danger-outline {
  background: transparent;
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.btn-small {
  padding: 5px 10px;
  font-size: 0.72rem;
}

.btn-large {
  padding: 14px 18px;
  font-size: 0.95rem;
}

.workout-footer-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

/* Floating Timer Widget */
.floating-timer-widget {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--accent-primary);
  border-radius: 40px;
  padding: 6px 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 15px var(--accent-glow);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: var(--transition-fast);
}

.floating-timer-widget.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 20px);
}

.timer-widget-inner {
  display: flex;
  align-items: center;
  gap: 10px;
}

.timer-progress-ring {
  position: relative;
  width: 38px;
  height: 38px;
}

.circular-chart {
  display: block;
  max-width: 100%;
  max-height: 100%;
}

.circle-bg {
  fill: none;
  stroke: var(--border-color);
  stroke-width: 3.8;
}

.circle {
  fill: none;
  stroke-width: 3.8;
  stroke: var(--accent-primary);
  stroke-linecap: round;
  transition: stroke-dasharray 0.3s ease;
}

.timer-number {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--text-main);
}

.timer-info {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.timer-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-weight: 600;
}

.timer-controls-mini {
  display: flex;
  gap: 4px;
}

.timer-mini-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.68rem;
  cursor: pointer;
}

/* Supplements Timeline */
.supplements-timeline {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.supp-phase-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px;
}

.supp-phase-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.supp-phase-icon {
  font-size: 1.1rem;
}

.supp-phase-title {
  font-size: 0.88rem;
  font-weight: 700;
}

.supp-phase-time {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-left: auto;
}

.supp-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  margin-bottom: 6px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.supp-item.taken {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.08);
}

.supp-details h5 {
  font-size: 0.82rem;
  font-weight: 700;
}

.supp-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.supp-check-box {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: transparent;
  font-size: 0.8rem;
  font-weight: 800;
}

.supp-item.taken .supp-check-box {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

/* History & Analytics */
.stats-overview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.metric-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px 8px;
  text-align: center;
}

.metric-num {
  display: block;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent-primary);
}

.metric-title {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 600;
}

.history-entry-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  margin-bottom: 8px;
}

.history-entry-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.history-title {
  font-size: 0.85rem;
  font-weight: 700;
}

.history-date {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.history-metrics {
  display: flex;
  gap: 12px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.history-metrics strong {
  color: var(--accent-primary);
}

/* Modal Overlay & Forms */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--modal-overlay);
  backdrop-filter: blur(4px);
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeIn 0.2s ease-out;
}

.modal-overlay.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 18px;
  box-shadow: var(--shadow-card);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-main);
}

.form-input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: inherit;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}

/* Toast */
.app-toast {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--accent-primary);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  z-index: 4000;
  transition: var(--transition-fast);
}

.app-toast.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -20px);
}