@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* Light theme */
  --bg-color: #f3f4f6;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --card-bg: #ffffff;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --border-color: #e5e7eb;
  
  --primary: #10b981;
  --primary-hover: #059669;
  --primary-light: #d1fae5;
  --primary-dark: #047857;
  
  --accent: #3b82f6;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --danger-hover: #dc2626;

  --btn-bg: #e5e7eb;
  --btn-hover: #d1d5db;

  --modal-bg: rgba(0, 0, 0, 0.5);
  
  --split-btn-bg: #d1fae5;
  --split-btn-hover: #a7f3d0;
  --split-btn-text: #065f46;
  
  --partial-bg: #fef3c7;
  --partial-border: #f59e0b;
  --partial-text: #92400e;
}

[data-theme='dark'] {
  --bg-color: #111827;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --card-bg: #1f2937;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --border-color: #374151;
  
  --primary: #10b981;
  --primary-hover: #34d399;
  --primary-light: #064e3b;
  --primary-dark: #059669;

  --btn-bg: #374151;
  --btn-hover: #4b5563;

  --modal-bg: rgba(0, 0, 0, 0.7);
  
  --split-btn-bg: #065f46;
  --split-btn-hover: #064e3b;
  --split-btn-text: #d1fae5;
  
  --partial-bg: #78350f;
  --partial-border: #d97706;
  --partial-text: #fef3c7;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.icon-btn {
  background: var(--card-bg);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--card-shadow);
  color: var(--text-primary);
  font-size: 1.2rem;
  transition: transform 0.1s, background-color 0.2s;
}

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

.logo-container {
  text-align: center;
  margin-bottom: 2rem;
}

.logo-circle {
  background-color: var(--primary);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-size: 2.5rem;
  color: white;
  position: relative;
  box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.4);
}

.logo-emoji {
  position: absolute;
  bottom: -5px;
  right: -5px;
  background: var(--card-bg);
  border-radius: 50%;
  padding: 4px;
  font-size: 1.2rem;
  box-shadow: var(--card-shadow);
}

.title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.025em;
  margin-bottom: 0.25rem;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.byline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* Cards */
.card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 1rem;
  transition: background-color 0.3s;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.card-title {
  font-weight: 600;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Toggles and Controls */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--btn-bg);
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(22px);
}

/* Segmented Control */
.segmented-control {
  display: flex;
  background-color: var(--btn-bg);
  border-radius: 0.75rem;
  padding: 0.25rem;
  margin-bottom: 0.5rem;
}

.segment-btn {
  flex: 1;
  text-align: center;
  padding: 0.5rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
}

.segment-btn.active {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.mode-description {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* Custom Split Inputs */
.split-inputs {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  align-items: center;
}

.split-input-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.split-input-group label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

@media (max-width: 480px) {
  .split-inputs {
    flex-direction: column;
    gap: 0.75rem;
  }
  .split-input-group {
    flex-direction: row;
    width: 100%;
    justify-content: space-between;
  }
  .split-input-group label {
    font-size: 1rem;
    margin-bottom: 0;
    width: 80px;
    text-align: left;
  }
  .stepper-group {
    width: 140px !important;
  }
}

.stepper-group {
  display: flex;
  align-items: center;
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  background-color: var(--bg-color);
  overflow: hidden;
}

.stepper-btn {
  background: var(--btn-bg);
  color: var(--text-primary);
  border: none;
  width: 32px;
  height: 36px;
  flex-shrink: 0;
  font-weight: bold;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s;
}

.stepper-btn:hover {
  background: var(--btn-hover);
}

.stepper-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.split-input-group input {
  flex: 1;
  min-width: 0;
  width: 100%;
  height: 36px;
  padding: 0;
  border: none;
  background-color: transparent;
  color: var(--text-primary);
  text-align: center;
  font-weight: 600;
  -moz-appearance: textfield; /* Hide default spinner in FF */
}

/* Hide default spinner in Webkit */
.split-input-group input::-webkit-outer-spin-button,
.split-input-group input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.split-input-group input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.split-summary {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 600;
  background: var(--primary-light);
  padding: 0.5rem;
  border-radius: 0.5rem;
}

/* Primary Buttons */
.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border: none;
  padding: 1rem;
  border-radius: 0.75rem;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.2s;
  box-shadow: 0 4px 6px -1px rgba(16, 185, 129, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary:active {
  transform: translateY(2px);
  box-shadow: 0 2px 4px -1px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
  width: 100%;
  background-color: var(--btn-bg);
  color: var(--text-primary);
  border: none;
  padding: 1rem;
  border-radius: 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

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

.btn-danger {
  width: 100%;
  background-color: var(--danger-light);
  color: var(--danger);
  border: none;
  padding: 1rem;
  border-radius: 0.75rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

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

/* Workout Screen Elements */
.timer-bar {
  position: sticky;
  top: 0;
  background-color: #111827; /* Always dark for contrast */
  color: white;
  padding: 1rem;
  border-radius: 0 0 1rem 1rem;
  margin: -1.5rem -1rem 1rem -1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.timer-display {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: monospace;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timer-display .dot {
  color: var(--primary);
  font-size: 1rem;
}

.timer-pause {
  background-color: #f59e0b; /* Amber */
  color: white;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.overall-progress-container {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background-color: var(--btn-bg);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--primary);
  transition: width 0.3s ease-out;
}

/* Split Button Card */
.split-card {
  background-color: var(--split-btn-bg);
  border: 2px solid var(--primary);
  color: var(--split-btn-text);
  transition: all 0.3s;
}

.split-card.partial {
  background-color: var(--partial-bg);
  border-color: var(--partial-border);
  color: var(--partial-text);
}

.split-card-header {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.split-card-details {
  font-size: 0.9rem;
  margin-bottom: 1rem;
  opacity: 0.9;
}

.btn-complete-split {
  width: 100%;
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 1rem;
  border-radius: 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 6px -1px rgba(16, 185, 129, 0.4);
  transition: transform 0.1s, background-color 0.3s;
}

.split-card.partial .btn-complete-split {
  background-color: var(--partial-border);
  box-shadow: 0 4px 6px -1px rgba(245, 158, 11, 0.4);
}

.btn-complete-split:active {
  transform: scale(0.98);
}

.btn-undo-split {
  width: 100%;
  background: transparent;
  color: var(--primary-dark);
  border: none;
  padding: 0.5rem;
  margin-top: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
}

/* Exercise Cards */
.exercise-card {
  display: flex;
  flex-direction: column;
}

.exercise-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.exercise-title-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.exercise-icon {
  font-size: 1.5rem;
}

.exercise-name {
  font-weight: 700;
  font-size: 1.1rem;
}

.exercise-remaining {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.exercise-count {
  text-align: right;
}

.exercise-current {
  font-size: 1.5rem;
  font-weight: 800;
}

.exercise-total {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.exercise-progress-bg {
  width: 100%;
  height: 10px;
  background-color: var(--btn-bg);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.exercise-progress-fill {
  height: 100%;
  background-color: var(--primary);
  transition: width 0.3s ease-out;
}

.rep-buttons {
  display: flex;
  gap: 0.5rem;
}

.btn-rep {
  flex: 1;
  background-color: var(--split-btn-bg);
  color: var(--split-btn-text);
  border: none;
  padding: 0.75rem 0;
  border-radius: 0.5rem;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

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

.btn-undo {
  background-color: var(--btn-bg);
  color: var(--text-secondary);
  border: none;
  width: 40px;
  border-radius: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
}

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

.btn-undo:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Checkbox Cards (Runs) */
.checkbox-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.checkbox-btn {
  width: 40px;
  height: 40px;
  border-radius: 0.5rem;
  background-color: var(--btn-bg);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: transparent;
  transition: all 0.2s;
  font-size: 1.2rem;
}

.checkbox-card.completed .checkbox-btn {
  background-color: var(--primary);
  color: white;
}

.checkbox-card.completed .exercise-name {
  color: var(--text-secondary);
  text-decoration: line-through;
}

/* Workout Actions */
.workout-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--modal-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

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

.modal-content {
  background-color: var(--bg-color);
  border-radius: 1rem;
  padding: 1.5rem;
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  transform: translateY(20px);
  transition: transform 0.3s;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 800;
}

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

/* History List */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.history-item {
  background-color: var(--card-bg);
  padding: 1rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.history-item-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.history-item-stats {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
}

.history-item-badge {
  background-color: var(--primary-light);
  color: var(--primary-dark);
  padding: 0.2rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.empty-state {
  text-align: center;
  color: var(--text-secondary);
  padding: 2rem 0;
}

/* Completion Screen */
.completion-content {
  text-align: center;
}

.completion-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.completion-time {
  font-size: 3rem;
  font-weight: 800;
  font-family: monospace;
  color: var(--primary);
  margin: 1.5rem 0;
}

.completion-stats {
  display: flex;
  justify-content: space-around;
  margin-bottom: 2rem;
  background-color: var(--card-bg);
  padding: 1rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
}

.stat-box {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Animations */
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.pulse {
  animation: pulse 0.3s ease-in-out;
}

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