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

:root {
  --bg: #1a1a1e;
  --card: #2c2c30;
  --primary: #f0d078;
  --primary-dark: #d4b45c;
  --on-primary: #2a2000;
  --danger: #ff6b6b;
  --text: #f0ece4;
  --text-secondary: #9a9690;
  --border: #3a3a3e;
  --success: #7ec87e;
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --radius: 12px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding-top: calc(var(--safe-top) + 52px);
  padding-bottom: calc(var(--safe-bottom) + 16px);
  -webkit-user-select: none;
  user-select: none;
}

/* Tab Bar */
.tab-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding-top: var(--safe-top);
  z-index: 100;
}

.tab {
  flex: 1;
  padding: 14px 8px;
  border: none;
  background: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.2s;
}

.tab.active {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
}

/* Pages */
.page {
  display: none;
  padding: 16px;
  max-width: 600px;
  margin: 0 auto;
}

.page.active {
  display: block;
}

.page h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 16px;
}

/* Buttons */
.btn-primary {
  display: block;
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  background: var(--primary);
  color: var(--on-primary);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 12px;
  transition: background 0.2s;
}

.btn-primary:active {
  background: var(--primary-dark);
}

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

.btn-cancel {
  display: block;
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  margin-bottom: 8px;
}

.btn-delete {
  display: block;
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius);
  background: none;
  color: var(--danger);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  margin-top: 8px;
}

/* Exercise Cards */
.exercise-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.exercise-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: transform 0.15s;
}

.exercise-card:active {
  transform: scale(0.98);
}

.exercise-card .play-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 18px;
}

.exercise-card .info {
  flex: 1;
  min-width: 0;
}

.exercise-card .info .name {
  font-size: 17px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.exercise-card .info .detail {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.exercise-card .check-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--success);
  background: none;
  color: var(--success);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}

.exercise-card .check-btn:active,
.exercise-card .check-btn.checked {
  background: var(--success);
  color: white;
}

.exercise-card .edit-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Overdue indicator */
.exercise-card.overdue .detail {
  color: var(--danger);
  font-weight: 500;
}

/* Not-yet-due cards */
.exercise-card.not-due {
  opacity: 0.6;
}

/* Skip button */
.skip-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--text-secondary);
  background: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}

.skip-btn:active,
.skip-btn.checked {
  background: var(--text-secondary);
  color: var(--card);
}

/* Section divider */
.section-divider {
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 12px 0 4px;
}

/* Location filter */
.location-filter {
  display: flex;
  gap: 8px;
  margin-bottom: 4px;
}

.filter-btn {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn.active {
  background: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}

/* Location badge */
.location-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  vertical-align: middle;
  margin-left: 4px;
}

.location-badge.home {
  background: #2e4a30;
  color: #7ec87e;
}

.location-badge.gym {
  background: #2a3a4e;
  color: #6eaadc;
}

.location-badge.both {
  background: #3e2e4a;
  color: #b88ad8;
}

/* Timing badges */
.type-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  vertical-align: middle;
  margin-left: 4px;
}

.type-badge.workout {
  background: #3a2e1e;
  color: #e0a850;
}

.type-badge.stretch {
  background: #1e3a3a;
  color: #50c8b0;
}

/* Body part badges */
.bodypart-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  vertical-align: middle;
  margin-left: 4px;
}

.bodypart-badge.legs {
  background: #2e2a3e;
  color: #a088d8;
}

.bodypart-badge.upper {
  background: #3e2a2a;
  color: #d88888;
}

.bodypart-badge.core {
  background: #2a3e2e;
  color: #88c8a0;
}

/* Select styling */
.modal-form select {
  display: block;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 17px;
  margin-top: 6px;
  background: var(--bg);
  color: var(--text);
  -webkit-appearance: none;
  appearance: none;
}

/* Toggle switch */
.toggle-label {
  display: flex !important;
  align-items: center;
  justify-content: space-between;
  text-transform: none !important;
  font-size: 17px !important;
  font-weight: 500 !important;
  color: var(--text) !important;
  letter-spacing: 0 !important;
}

.toggle-label input[type="checkbox"] {
  display: none;
}

.toggle-switch {
  width: 51px;
  height: 31px;
  background: #4a4a4e;
  border-radius: 16px;
  position: relative;
  flex-shrink: 0;
  transition: background 0.3s;
  cursor: pointer;
}

.toggle-switch::after {
  content: '';
  position: absolute;
  width: 27px;
  height: 27px;
  background: white;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 0.3s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle-label input:checked + .toggle-switch {
  background: var(--primary);
}

.toggle-label input:checked + .toggle-switch::after {
  transform: translateX(20px);
}

/* Paused exercise card */
.exercise-card.paused {
  opacity: 0.5;
}

.paused-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  vertical-align: middle;
  margin-left: 4px;
  background: #4a2a2a;
  color: #ff6b6b;
}

/* Empty state */
.empty-state {
  text-align: center;
  color: var(--text-secondary);
  font-size: 16px;
  margin-top: 40px;
}

/* Modals */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 200;
  animation: fadeIn 0.2s;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-content {
  background: var(--card);
  border-radius: 20px 20px 0 0;
  width: 100%;
  max-width: 600px;
  padding: 24px;
  padding-bottom: calc(24px + var(--safe-bottom));
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-close {
  float: right;
  border: none;
  background: var(--bg);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-form h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}

.modal-form label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.modal-form input[type="text"],
.modal-form input[type="number"] {
  display: block;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 17px;
  margin-top: 6px;
  background: var(--bg);
  color: var(--text);
  -webkit-appearance: none;
}

.modal-form input[type="file"] {
  display: block;
  margin-top: 6px;
  font-size: 15px;
}

.hint {
  display: block;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  text-transform: none;
  letter-spacing: 0;
  margin-top: 4px;
}

.current-video {
  display: block;
  font-size: 13px;
  font-weight: 400;
  color: var(--primary);
  text-transform: none;
  letter-spacing: 0;
  margin-top: 4px;
}

.modal-actions {
  margin-top: 24px;
}

/* Video modal */
#video-modal .modal-content {
  border-radius: 20px 20px 0 0;
  padding: 16px;
  background: #000;
}

#video-player {
  width: 100%;
  max-height: 70vh;
  border-radius: 8px;
}

#video-modal .modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 10;
  background: rgba(255,255,255,0.2);
  color: white;
}

/* Plan tab */
.plan-description {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.plan-output {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  white-space: pre-wrap;
  font-size: 15px;
  line-height: 1.6;
  margin-bottom: 16px;
  min-height: 100px;
  -webkit-user-select: text;
  user-select: text;
}

.data-section {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.data-section h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.data-section .hint {
  display: block;
  margin-top: 8px;
}

.app-version {
  text-align: center;
  color: var(--text-secondary);
  font-size: 12px;
  margin-top: 24px;
  padding-bottom: 16px;
}