:root {
  --bg-color: #f8fafc;
  --panel-bg: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #e2e8f0;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --badge-bg: #eff6ff;
  --badge-text: #1e40af;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Fixed Top Bar */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--panel-bg);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  padding: 10px 20px;
}

.top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
  flex-wrap: wrap;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-color);
}

.filters {
  display: flex;
  align-items: center;
  gap: 20px;
}

.select-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

select {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
}

select:focus {
  border-color: var(--accent-color);
}

/* Toggle Switch Styling */
.toggle-container {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.toggle-switch {
  display: inline-flex;
  background-color: #e2e8f0;
  padding: 3px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.toggle-btn {
  border: none;
  background: transparent;
  padding: 5px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.toggle-btn.active {
  background-color: var(--panel-bg);
  color: var(--accent-color);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

#navCounter {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 45px;
  text-align: center;
}

.btn {
  padding: 6px 14px;
  border-radius: 6px;
  border: none;
  background-color: var(--accent-color);
  color: #fff;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background-color 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

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

.btn:disabled {
  background-color: #cbd5e1;
  cursor: not-allowed;
}

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

.btn-outline:hover {
  background-color: var(--badge-bg);
}

.info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 8px;
  gap: 10px;
}

.exercise-details h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 12px;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  font-weight: 600;
}

.badge-type {
  background-color: #f0fdf4;
  color: #166534;
}

.badge-sets {
  background-color: #fefce8;
  color: #854d0e;
}

.badge-rest {
  background-color: #fdf2f8;
  color: #9d174d;
}

/* Main Container & Iframe */
.content-container {
  margin-top: 110px;
  flex: 1;
  width: 100%;
  height: calc(100vh - 110px);
  background-color: #fff;
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
}