:root {
  /* Clean Palette - Light Mode Default */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  
  --bg: #f9fafb; /* Gray 50 */
  --sidebar-bg: #f3f4f6; /* Gray 100 */
  --surface: #ffffff;
  --surface-hover: #f3f4f6;
  --border: #e5e7eb;
  
  --text: #111827;
  --text-muted: #6b7280;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --radius: 6px;
  --transition: all 0.15s ease-in-out;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-light: rgba(59, 130, 246, 0.15);

    --bg: #111827;
    --sidebar-bg: #1f2937;
    --surface: #1f2937;
    --surface-hover: #374151;
    --border: #374151;
    
    --text: #f9fafb;
    --text-muted: #9ca3af;
  }
}

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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  margin: 0;
  display: flex;
}

/* Scrollbars */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Full Width App Container */
.app-container {
  width: 100%;
  min-height: 100vh;
  background: var(--surface);
  display: flex;
}

.sidebar {
  width: 280px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 32px 24px;
  gap: 32px;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px;
}
.logo img { width: 32px; height: 32px; border-radius: 6px; }
.logo span { font-weight: 700; font-size: 18px; color: var(--text); letter-spacing: -0.02em; }

.nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.nav-item {
  padding: 10px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
  font-size: 15px;
  color: var(--text-muted);
  transition: var(--transition);
}
.nav-item svg {
  width: 20px;
  height: 20px;
}
.nav-item:hover {
  background: var(--surface-hover);
  color: var(--text);
}
.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 48px 80px 100px;
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.content-section { display: none; }
.content-section.active {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.section-header h1 { font-size: 28px; font-weight: 600; margin-bottom: 8px; color: var(--text); letter-spacing: -0.01em; }
.section-header p.subtitle { color: var(--text-muted); font-size: 16px; }

/* Settings Layout Pattern */
.card {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.setting-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.setting-row:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.setting-row.column {
  flex-direction: column;
  gap: 16px;
}

.setting-info {
  flex: 1;
  padding-right: 48px;
  display: flex;
  gap: 16px;
}

.setting-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.setting-icon svg {
  width: 20px;
  height: 20px;
}

.setting-text-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 2px;
}

.setting-text-group label {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
  cursor: pointer;
}

.setting-text-group .help-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
}

.setting-control {
  flex-shrink: 0;
  width: 280px;
  display: flex;
  gap: 8px;
}

.setting-row.column .setting-control {
  width: 100%;
}

select, input[type="text"], input[type="number"], textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  outline: none;
  transition: var(--transition);
}
select:focus, input:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Custom Checkbox as Control */
.checkbox-wrap {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  cursor: pointer;
  padding: 8px 0;
}
.checkbox-wrap input {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--primary);
  margin-top: 2px;
  flex-shrink: 0;
}
.checkbox-wrap .setting-text-group label {
  font-size: 15px;
  font-weight: 600;
}

.checkbox-subgroup {
  margin-left: 56px;
  padding-left: 20px;
  border-left: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 16px;
}

/* Footer Actions */
.footer-actions {
  position: fixed;
  bottom: 0; left: 280px; right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 20px 80px;
  display: flex;
  justify-content: flex-end;
  z-index: 100;
}

.btn {
  padding: 10px 20px;
  border-radius: var(--radius);
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  font-size: 15px;
  border: 1px solid transparent;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

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

#status {
  position: fixed;
  top: 32px; left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  z-index: 1000;
  box-shadow: var(--shadow);
}
#status.show { opacity: 1; }

#workspace-list {
  height: 200px;
  padding: 4px;
}
#workspace-list option {
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 14px;
}
.workspace-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}