:root,
[data-theme="midnight"] {
  --bg-dark: #0f172a;
  --bg-gradient: none;
  --surface-dark: #1e293b;
  --surface-hover: #334155;
  --surface-glass: rgba(30, 41, 59, 0.6);
  --backdrop-blur: none;
  --primary: #0284c7;
  --primary-light: #38bdf8;
  --primary-gradient: linear-gradient(135deg, #0284c7, #38bdf8);
  --ai-gradient: linear-gradient(135deg, #0284c7, #6366f1);
  --accent: #38bdf8;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --dashed-border: #475569;
  --error: #ef4444;
  --success: #10b981;
  --partner-bg: #172554;
  --partner-border: #1e40af;
  --card-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  --modal-bg: #1e293b;
  --input-bg: #0f172a;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --content-max-width: 1200px;
}

[data-theme="glass"] {
  --bg-dark: #090d16;
  --bg-gradient: radial-gradient(circle at top left, #1e1b4b 0%, #0c2340 50%, #030712 100%);
  --surface-dark: rgba(30, 41, 59, 0.7);
  --surface-hover: rgba(51, 65, 85, 0.8);
  --surface-glass: rgba(255, 255, 255, 0.08);
  --backdrop-blur: blur(24px) saturate(180%);
  --primary: #38bdf8;
  --primary-light: #7dd3fc;
  --primary-gradient: linear-gradient(135deg, #0284c7, #38bdf8);
  --ai-gradient: linear-gradient(135deg, #4f46e5, #38bdf8);
  --accent: #38bdf8;
  --text-main: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.7);
  --border-color: rgba(255, 255, 255, 0.16);
  --dashed-border: rgba(255, 255, 255, 0.28);
  --error: #f87171;
  --success: #34d399;
  --partner-bg: rgba(30, 58, 138, 0.6);
  --partner-border: rgba(96, 165, 250, 0.3);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --modal-bg: rgba(15, 23, 42, 0.9);
  --input-bg: rgba(0, 0, 0, 0.4);
}

[data-theme="oled"] {
  --bg-dark: #000000;
  --bg-gradient: none;
  --surface-dark: #0d0d0d;
  --surface-hover: #171717;
  --surface-glass: #111111;
  --backdrop-blur: none;
  --primary: #00f0ff;
  --primary-light: #38bdf8;
  --primary-gradient: linear-gradient(135deg, #0077b6, #00f0ff);
  --ai-gradient: linear-gradient(135deg, #0096c7, #00f0ff);
  --accent: #00f0ff;
  --text-main: #ffffff;
  --text-muted: #a3a3a3;
  --border-color: #262626;
  --dashed-border: #404040;
  --error: #ff3333;
  --success: #00ff88;
  --partner-bg: #081024;
  --partner-border: #1e3a8a;
  --card-shadow: 0 0 15px rgba(0, 240, 255, 0.05);
  --modal-bg: #0d0d0d;
  --input-bg: #000000;
}

[data-theme="emerald"] {
  --bg-dark: #040907;
  --bg-gradient: radial-gradient(circle at top right, #062419 0%, #03120c 60%, #020604 100%);
  --surface-dark: #091a12;
  --surface-hover: #102e21;
  --surface-glass: rgba(16, 185, 129, 0.08);
  --backdrop-blur: none;
  --primary: #10b981;
  --primary-light: #34d399;
  --primary-gradient: linear-gradient(135deg, #059669, #10b981);
  --ai-gradient: linear-gradient(135deg, #047857, #34d399);
  --accent: #4ade80;
  --text-main: #f0fdf4;
  --text-muted: #86efac;
  --border-color: #14422e;
  --dashed-border: #1e6345;
  --error: #fb7185;
  --success: #34d399;
  --partner-bg: #072318;
  --partner-border: #10b981;
  --card-shadow: 0 4px 20px rgba(16, 185, 129, 0.15);
  --modal-bg: #091a12;
  --input-bg: #040907;
}

[data-theme="sunset"] {
  --bg-dark: #120e14;
  --bg-gradient: radial-gradient(circle at top right, #2a111a 0%, #150e18 60%, #0d070f 100%);
  --surface-dark: #1d1622;
  --surface-hover: #2d2235;
  --surface-glass: rgba(249, 115, 22, 0.08);
  --backdrop-blur: none;
  --primary: #f97316;
  --primary-light: #fb923c;
  --primary-gradient: linear-gradient(135deg, #d97706, #f97316);
  --ai-gradient: linear-gradient(135deg, #ea580c, #fbbf24);
  --accent: #f59e0b;
  --text-main: #fff7ed;
  --text-muted: #fdba74;
  --border-color: #3b2a47;
  --dashed-border: #5a3f6d;
  --error: #ef4444;
  --success: #10b981;
  --partner-bg: #29151e;
  --partner-border: #f97316;
  --card-shadow: 0 4px 20px rgba(249, 115, 22, 0.15);
  --modal-bg: #1d1622;
  --input-bg: #120e14;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
  background-color: var(--bg-dark);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  background-size: cover;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
}

header.app-header {
  background-color: var(--surface-dark);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid var(--border-color);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
}

.header-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  box-sizing: border-box;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  user-select: none;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.brand:hover {
  transform: scale(1.03);
}

.brand-logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.25));
}

.brand-text {
  display: flex;
  align-items: baseline;
  font-size: 1.3rem;
  letter-spacing: -0.5px;
  line-height: 1;
}

.brand-name {
  font-weight: 900;
  color: var(--text-main);
}

.brand-suffix {
  font-weight: 800;
  color: var(--primary-light);
  margin-left: 1px;
}

/* Partner Switcher Bar (Turn Taking) */
.partner-bar {
  max-width: var(--content-max-width);
  margin: 12px auto 0 auto;
  padding: 0 20px;
  width: 100%;
  box-sizing: border-box;
}

.partner-bar-inner {
  background: var(--surface-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 6px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  box-sizing: border-box;
  box-shadow: var(--card-shadow);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  overflow-x: auto;
}

.partner-label {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--primary-light);
  text-transform: uppercase;
  white-space: nowrap;
}

.user-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-tab {
  background: var(--surface-glass);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.user-tab:hover {
  background: var(--surface-hover);
  color: var(--text-main);
  border-color: var(--primary-light);
}

.user-tab.active {
  background: var(--primary-gradient);
  color: #ffffff;
  border-color: var(--primary-light);
  font-weight: 800;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.add-partner-btn {
  background: transparent;
  color: var(--primary-light);
  border: 1px dashed var(--dashed-border);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.add-partner-btn:hover {
  border-color: var(--primary-light);
  background: var(--surface-hover);
}

/* Container & Main Layout */
.app-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  width: 100%;
  padding: 16px 20px;
  box-sizing: border-box;
  flex: 1;
}

.app-footer {
  width: 100%;
  background: var(--bg-dark);
  border-top: 1px solid var(--border-color);
  padding: 0;
}

.footer-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 16px 20px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  box-sizing: border-box;
}

/* Screen Views */
.view-panel {
  display: none;
}

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

/* Mockup Split Screen View (2 Columns) */
.workout-split-container {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 16px;
  margin-top: 12px;
  width: 100%;
  box-sizing: border-box;
}

@media (max-width: 768px) {
  .workout-split-container {
    grid-template-columns: 1fr;
  }
}

/* Left Sidebar (Exercises 1..N) */
.exercise-sidebar {
  background-color: var(--surface-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-title {
  font-size: 0.85rem;
  font-weight: 900;
  color: var(--primary-light);
  letter-spacing: 1px;
}

.exercise-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.exercise-item-btn {
  background-color: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  text-align: left;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s;
}

.exercise-item-btn.active {
  background-color: rgba(2, 132, 199, 0.2);
  border-color: var(--primary-light);
  color: #ffffff;
  font-weight: 800;
}

/* Exercise Sidebar & Workout Split Screen */
@media (max-width: 768px) {
  .exercise-sidebar {
    display: flex;
    margin-bottom: 8px;
  }
}

/* Hide Strength Telemetry Bar, Rest Timers & Sidebar/Rows during Cardio Sessions */
body.cardio-active #liveWorkoutTelemetryBar,
body.cardio-active .exercise-column-timer-card,
body.cardio-active .exercise-sidebar,
body.cardio-active .workout-split-container {
  display: none !important;
}

/* Large 2-Row Dedicated Timer at Top of Exercises Column */
.exercise-column-timer-card {
  background: var(--surface-dark);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px 14px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.exercise-column-timer-card.timer-active {
  border-color: var(--success);
  background: var(--surface-dark);
  box-shadow: 0 4px 25px rgba(34, 197, 94, 0.2), inset 0 1px 0 rgba(34, 197, 94, 0.2);
}

.exercise-column-timer-card.timer-overtime {
  border-color: var(--error);
  background: var(--surface-dark);
  box-shadow: 0 4px 25px rgba(239, 68, 68, 0.3), inset 0 1px 0 rgba(239, 68, 68, 0.2);
  animation: timerPulseRed 1.5s infinite;
}

@keyframes timerPulseRed {
  0%, 100% { box-shadow: 0 4px 25px rgba(239, 68, 68, 0.3); }
  50% { box-shadow: 0 4px 35px rgba(239, 68, 68, 0.6); }
}

.column-timer-display-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.column-timer-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
}

.column-timer-icon {
  font-size: 1.35rem;
  flex-shrink: 0;
}

.column-timer-label {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--text-muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  white-space: nowrap;
}

.column-timer-digits {
  font-size: clamp(1.65rem, 4.5vw, 2.15rem);
  font-family: 'JetBrains Mono', monospace, -apple-system, BlinkMacSystemFont;
  font-weight: 900;
  color: var(--primary-light);
  letter-spacing: 0.5px;
  line-height: 1;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  white-space: nowrap;
  flex-shrink: 0;
}

.exercise-column-timer-card.timer-active .column-timer-digits {
  color: var(--success);
  text-shadow: 0 2px 12px rgba(34, 197, 94, 0.4);
}

.exercise-column-timer-card.timer-overtime .column-timer-digits {
  color: var(--error);
  text-shadow: 0 2px 14px rgba(239, 68, 68, 0.5);
}

.column-timer-controls-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  width: 100%;
}

.col-timer-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 9px;
  padding: 10px 12px;
  font-size: 0.96rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease;
  min-height: 44px;
  width: 100%;
}

.col-timer-btn:hover {
  background: var(--surface-hover);
  border-color: var(--primary-light);
  transform: translateY(-1px);
}

.col-timer-btn:active {
  transform: translateY(0);
}

.col-timer-btn-primary {
  background: var(--surface-glass);
  border-color: var(--primary-light);
  color: var(--primary-light);
}

.col-timer-btn-primary:hover {
  background: var(--primary-gradient);
  border-color: var(--primary-light);
  color: #ffffff;
}

.col-timer-btn-danger {
  color: var(--error);
  border-color: rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.08);
}

.col-timer-btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.5);
}

/* Right Detail Column (Mockup Boxes) */
.exercise-detail-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

/* Card Boxes */
.mockup-card {
  background-color: var(--surface-dark);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  padding: 18px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

/* Box 1: Previous Session Results (Dashed Border) */
.card-dashed {
  border: 2px dashed var(--dashed-border);
  background-color: var(--surface-glass);
}

.card-title-muted {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.prev-sets-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.prev-set-chip {
  background-color: var(--bg-dark);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

/* Box 2: TODAY [ADD SET] */
.today-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.today-title {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--primary-light);
  letter-spacing: 0.5px;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background-color 0.2s;
}

.btn-primary:hover {
  background-color: #0369a1;
}

.btn-outlined {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
}

.today-sets-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.set-row-item {
  background-color: var(--bg-dark);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.05rem;
  font-weight: 700;
}

.set-row-item .del-btn {
  color: var(--error);
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  padding: 2px 8px;
}

/* Box 3: Progress Graph */
.graph-container {
  width: 100%;
  height: 180px;
  margin-top: 8px;
  position: relative;
}

.chart-tooltip {
  position: absolute;
  background: #1e293b;
  border: 1px solid var(--primary-light);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--text-main);
  box-shadow: 0 10px 25px rgba(0,0,0,0.6);
  pointer-events: none;
  display: none;
  z-index: 100;
  white-space: nowrap;
  transition: opacity 0.15s ease;
}

canvas#progressChart {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-sm);
}

/* Box 4: STATS */
.stats-title {
  font-size: 1rem;
  font-weight: 900;
  color: var(--primary-light);
  margin-bottom: 8px;
}

.stat-line {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 4px;
}

/* Modal Dialogs */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

/* Full-Screen Opaque Login Screen (No background elements visible) */
#loginModal.modal-overlay {
  background: var(--bg-dark);
  z-index: 999999;
}

#loginModal .modal-content {
  background: var(--surface-dark);
  border: 1px solid var(--border-color);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
}

/* Staging Environment Indicators & Watermark */
body.is-staging-env {
  border-top: 3px solid #f59e0b;
}

.staging-watermark-badge {
  position: fixed;
  bottom: 18px;
  right: 18px;
  background: rgba(245, 158, 11, 0.2);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.5);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  z-index: 9999999;
  pointer-events: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

.staging-header-pill {
  background: rgba(245, 158, 11, 0.16);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.45);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 6px;
  margin-left: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  vertical-align: middle;
}

.modal-content {
  background-color: var(--modal-bg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  box-sizing: border-box;
  margin: auto;
  box-shadow: var(--card-shadow);
}

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

.modal-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
}

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

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.form-control:focus {
  border-color: var(--primary);
}

/* Custom Select & Option Dynamic Theme Styling */
select.form-control,
select {
  background-color: var(--input-bg) !important;
  color: var(--text-main) !important;
  border: 1px solid var(--border-color) !important;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2338bdf8'%3e%3cpath d='M7 10l5 5 5-5z'/%3e%3c/svg%3e") !important;
  background-repeat: no-repeat !important;
  background-position: right 12px center !important;
  background-size: 18px 18px !important;
  padding-right: 36px !important;
  cursor: pointer;
}

select option {
  background-color: var(--surface-dark) !important;
  color: var(--text-main) !important;
  padding: 10px 14px;
  font-weight: 600;
}

select option:hover,
select option:focus,
select option:active,
select option:checked {
  background-color: var(--primary) !important;
  color: #ffffff !important;
}

/* Theme Picker Swatches & Cards */
.theme-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 10px;
}

.theme-card-btn {
  background: var(--surface-dark);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: left;
  transition: all 0.2s ease;
  position: relative;
}

.theme-card-btn:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.theme-card-btn.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary), var(--card-shadow);
}

.theme-card-preview {
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.theme-preview-bg {
  flex: 2;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-preview-accent {
  flex: 1;
}

.theme-card-name {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-main);
}

.theme-card-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Footer Controls */
footer.app-footer {
  border-top: 1px solid var(--border-color);
  padding: 12px 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  background: var(--surface-dark);
}

/* --- MOBILE RESPONSIVE & SIDE-SCROLL ELIMINATION --- */
html, body {
  overflow-x: hidden;
  max-width: 100vw;
  width: 100%;
}

.header-nav-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 10px 12px;
  }

  .header-nav-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: flex-start;
  }

  .header-nav-actions .btn-outlined {
    padding: 6px 10px !important;
    font-size: 0.78rem !important;
    flex: 1 1 auto;
    text-align: center;
  }

  .partner-bar-inner {
    padding: 8px 12px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .workout-header-row {
    flex-direction: column;
    align-items: stretch !important;
    gap: 12px;
  }

  .workout-header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .workout-header-actions button {
    flex: 1;
    padding: 8px 8px !important;
    font-size: 0.78rem !important;
    text-align: center;
  }

  .modal-content {
    max-width: calc(100vw - 20px) !important;
    padding: 16px 12px !important;
  }

  .form-control.set-w-input,
  .form-control.set-r-input {
    width: 65px !important;
    padding: 4px 6px !important;
    font-size: 0.8rem !important;
  }
}

/* Screen Edge Red Alert Flash Overlay */
@keyframes edgeRedFlash {
  0%, 100% {
    box-shadow: inset 0 0 0 0 rgba(239, 68, 68, 0);
  }
  20%, 80% {
    box-shadow: inset 0 0 60px 25px rgba(239, 68, 68, 0.85);
  }
  50% {
    box-shadow: inset 0 0 100px 45px rgba(239, 68, 68, 1);
  }
}

.screen-edge-flash-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999999;
  animation: edgeRedFlash 1s ease-in-out 3;
}

/* Touch-Friendly Sizing for 15" Touch Screen / Desktop Mode */
.touch-btn-large {
  min-height: 52px !important;
  padding: 12px 24px !important;
  font-size: 1.15rem !important;
  font-weight: 800 !important;
  border-radius: var(--radius-md) !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 8px !important;
  cursor: pointer;
  touch-action: manipulation;
}

.touch-btn-submit {
  min-height: 52px !important;
  font-size: 1.1rem !important;
  font-weight: 800 !important;
  padding: 12px 20px !important;
  touch-action: manipulation;
}

.quick-check-set-btn {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 1.25rem;
  font-weight: 900;
  min-width: 52px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 3px 10px rgba(16, 185, 129, 0.35);
  touch-action: manipulation;
}
.quick-check-set-btn:active {
  transform: scale(0.92);
}

.planned-set-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px dashed rgba(56, 189, 248, 0.4);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.planned-set-row:hover {
  background: rgba(56, 189, 248, 0.08);
  border-color: var(--primary-light);
}

.reorder-arrow-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 4px;
  padding: 3px 8px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.15s ease;
}
.reorder-arrow-btn:hover {
  background: rgba(56, 189, 248, 0.2);
  color: var(--primary-light);
}
.reorder-arrow-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Rest Timer Badges */
.rest-timer-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 14px;
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.5px;
  border: 1px solid transparent;
}
.rest-timer-green {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.4);
}
.rest-timer-red {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.6);
  animation: pulseRed 1s infinite alternate;
}
@keyframes pulseRed {
  from { opacity: 0.85; transform: scale(1); }
  to { opacity: 1; transform: scale(1.03); }
}

/* --- EXERCISE GUIDE & MUSCLE HEATMAP (GARMIN CONNECT STYLE) --- */
.muscle-heatmap-container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  gap: 12px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 10px;
}

.muscle-heatmap-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.muscle-heatmap-figure-label {
  font-size: 0.74rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
}

.muscle-svg {
  width: 120px;
  height: 225px;
  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.5));
}

.body-silhouette {
  fill: #1e293b;
  stroke: #475569;
  stroke-width: 1.2;
}

.muscle-group {
  fill: #334155;
  stroke: #1e293b;
  stroke-width: 0.8;
  transition: all 0.35s ease;
}

.muscle-group.primary {
  fill: #ef4444 !important;
  stroke: #fca5a5 !important;
  stroke-width: 1.2 !important;
  filter: drop-shadow(0 0 5px rgba(239, 68, 68, 0.85));
}

.muscle-group.secondary {
  fill: #f59e0b !important;
  stroke: #fde68a !important;
  stroke-width: 1.2 !important;
  filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.75));
}

.muscle-legend-badge-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(239, 68, 68, 0.14);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #fca5a5;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 800;
}

.muscle-legend-badge-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(245, 158, 11, 0.14);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fde047;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 800;
}

.guide-step-card {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.guide-step-title {
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--primary-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.guide-step-content {
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--text-main);
}

/* Activity Logging & Cardio Styling */
.activity-chip {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.activity-chip:hover {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
}

.activity-chip.active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.25), rgba(2, 132, 199, 0.25));
  border-color: #10b981;
  color: #34d399;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.25);
}

.cardio-session-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
  padding: 2px 7px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 700;
}

.dur-preset-btn, .dist-preset-btn, .cal-preset-btn, .dur-set-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.dur-preset-btn:hover, .dist-preset-btn:hover, .cal-preset-btn:hover, .dur-set-btn:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--primary-light);
  color: var(--text-main);
}

/* Gym Equipment Inventory & Scanner Styles */
.equipment-category-box {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 14px;
}

.equipment-cat-header {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.equipment-checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}

.eq-check-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.eq-check-label:hover {
  background: rgba(168, 85, 247, 0.08);
  border-color: rgba(168, 85, 247, 0.3);
}

.eq-check-label input[type="checkbox"] {
  accent-color: #a855f7;
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.plate-stepper-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
}

.plate-stepper-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.plate-label {
  font-size: 0.78rem;
  font-weight: 800;
  color: #38bdf8;
}

.stepper-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-stepper {
  width: 26px;
  height: 26px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-main);
  font-weight: 900;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease;
}

.btn-stepper:hover {
  background: rgba(56, 189, 248, 0.25);
  color: #38bdf8;
}

.plate-qty-input {
  width: 44px;
  text-align: center;
  font-weight: 800;
  font-size: 0.9rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 4px;
  padding: 3px 0;
}

.gym-exercise-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 240px;
  overflow-y: auto;
  padding: 6px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.gym-exercise-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: #38bdf8;
  padding: 3px 8px;
  border-radius: 14px;
  font-size: 0.76rem;
  font-weight: 700;
}

.gym-exercise-tag .rm-tag-btn {
  cursor: pointer;
  color: #ef4444;
  font-weight: 900;
  font-size: 0.85rem;
  line-height: 1;
  border: none;
  background: none;
  padding: 0 2px;
}

.gym-exercise-tag .rm-tag-btn:hover {
  color: #f87171;
}

.gym-photo-preview-thumb {
  position: relative;
  width: 72px;
  height: 72px;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.gym-photo-preview-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.gym-photo-preview-thumb .del-thumb-btn {
  position: absolute;
  top: 2px;
  right: 2px;
  background: rgba(0, 0, 0, 0.7);
  color: #ef4444;
  border: none;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.gym-profile-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  transition: border-color 0.2s ease;
}

.gym-profile-card.active-gym {
  border-color: #10b981;
  background: rgba(16, 185, 129, 0.04);
}

/* ==========================================================
   MODERN APP REDESIGN: NAVIGATION, PROFILE HUB & SUB-TABS
   ========================================================== */

/* Top Navigation Bar (Desktop & Tablet) */
.main-nav-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-glass);
  padding: 4px 8px;
  border-radius: 24px;
  border: 1px solid var(--border-color);
}

.main-nav-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 18px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  user-select: none;
}

.main-nav-item:hover {
  color: var(--text-main);
  background: var(--surface-hover);
}

.main-nav-item.active {
  color: #ffffff;
  background: var(--primary-gradient);
  border-color: var(--primary-light);
  box-shadow: var(--card-shadow);
}

/* Mobile Bottom Navigation Bar */
.bottom-nav-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface-dark);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border-top: 1px solid var(--border-color);
  padding: 8px 12px calc(8px + env(safe-area-inset-bottom, 0px)) 12px;
  z-index: 999;
  justify-content: space-around;
  align-items: center;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
  background: none;
  border: none;
  cursor: pointer;
  transition: all 0.18s ease;
  min-width: 64px;
}

.bottom-nav-item .nav-icon {
  font-size: 1.25rem;
  line-height: 1;
  transition: transform 0.18s ease;
}

.bottom-nav-item:hover .nav-icon {
  transform: translateY(-2px);
}

.bottom-nav-item.active {
  color: var(--primary-light);
}

.bottom-nav-item.active .nav-icon {
  transform: scale(1.15);
  filter: drop-shadow(0 0 8px var(--primary-light));
}

@media (max-width: 768px) {
  .main-nav-bar {
    display: none;
  }
  .bottom-nav-bar {
    display: flex;
  }
  body {
    padding-bottom: calc(68px + env(safe-area-inset-bottom, 0px));
  }
}

/* Profile & Hub Sub-Tabs Segmented Bar */
.hub-subnav-container {
  background: var(--surface-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 6px 8px;
  margin-bottom: 20px;
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  box-shadow: var(--card-shadow);
}

.hub-subnav-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding: 2px;
  scrollbar-width: none;
}

.hub-subnav-bar::-webkit-scrollbar {
  display: none;
}

.hub-subnav-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

.hub-subnav-btn:hover {
  background: var(--surface-hover);
  color: var(--text-main);
  border-color: var(--border-color);
}

.hub-subnav-btn.active {
  color: #ffffff;
  background: var(--primary-gradient);
  border-color: var(--primary-light);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hub-tab-pane {
  display: none;
  animation: fadeInPane 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

.hub-tab-pane.active {
  display: block;
}

@keyframes fadeInPane {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* History / Calendar View Mode Switch */
.history-mode-switch {
  display: inline-flex;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 3px;
  gap: 4px;
}

.history-mode-btn {
  padding: 5px 12px;
  border-radius: 16px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
}

.history-mode-btn.active {
  background: var(--surface-hover);
  border-color: var(--primary-light);
  color: var(--primary-light);
}

/* Profile Hub Hero Header */
.hub-hero-card {
  background: var(--surface-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: 16px;
  box-shadow: var(--card-shadow);
}

/* --- BLUETOOTH HEART RATE TELEMETRY --- */
@keyframes heartBeat {
  0% { transform: scale(1); }
  14% { transform: scale(1.28); }
  28% { transform: scale(1); }
  42% { transform: scale(1.18); }
  70% { transform: scale(1); }
}

.hr-pulsing-icon {
  display: inline-block;
  animation: heartBeat 1.1s infinite cubic-bezier(0.215, 0.61, 0.355, 1);
  transform-origin: center;
}

.hr-zone-pill {
  font-size: 0.72rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.hr-zone-1 { background: rgba(148, 163, 184, 0.2); color: #94a3b8; border: 1px solid rgba(148, 163, 184, 0.4); } /* Warmup */
.hr-zone-2 { background: rgba(56, 189, 248, 0.2); color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.4); }  /* Fat Burn */
.hr-zone-3 { background: rgba(34, 197, 94, 0.2); color: #22c55e; border: 1px solid rgba(34, 197, 94, 0.4); }   /* Aerobic */
.hr-zone-4 { background: rgba(245, 158, 11, 0.2); color: #f59e0b; border: 1px solid rgba(245, 158, 11, 0.4); } /* Threshold */
.hr-zone-5 { background: rgba(239, 68, 68, 0.25); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.5); }  /* Maximum / Peak */

.hr-telemetry-gauge {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  margin: 0 auto 16px auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(239,68,68,0.15) 0%, rgba(15,23,42,0.8) 70%);
  border: 3px solid rgba(239, 68, 68, 0.4);
  box-shadow: 0 0 24px rgba(239, 68, 68, 0.2);
  transition: all 0.3s ease;
}