/* 
 * SiK Radio Configurator - Minimal & Beautiful Redesign
 * A clean, modern interface with subtle depth and elegant interactions
 */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Roboto Mono', monospace;

  /* Light Theme Colors */
  --bg-primary: #fafbfc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f4f6f8;
  --bg-elevated: #ffffff;

  --text-primary: #1a1f36;
  --text-secondary: #697386;
  --text-tertiary: #8792a2;
  --text-inverse: #ffffff;

  --accent-primary: #635bff;
  --accent-primary-hover: #5851ea;
  --accent-primary-subtle: rgba(99, 91, 255, 0.08);
  --accent-primary-muted: rgba(99, 91, 255, 0.15);

  --accent-success: #30d158;
  --accent-success-subtle: rgba(48, 209, 88, 0.1);

  --accent-warning: #ff9f0a;
  --accent-warning-subtle: rgba(255, 159, 10, 0.1);

  --accent-danger: #ff453a;
  --accent-danger-subtle: rgba(255, 69, 58, 0.1);

  --border-primary: rgba(0, 0, 0, 0.08);
  --border-secondary: rgba(0, 0, 0, 0.04);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
      --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.1);
      --shadow-glow: 0 0 40px rgba(99, 91, 255, 0.15);

      /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
      --radius-full: 9999px;

      /* Transitions */
      --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
      --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
      --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
      --transition-bounce: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

      /* Controls */
      --control-height: 38px;
      --control-height-compact: 28px;
}

/* Dark Theme */
:root[data-bs-theme="dark"] {
  --bg-primary: #0a0a0f;
  --bg-secondary: #13131a;
  --bg-tertiary: #1a1a24;
  --bg-elevated: #1e1e2a;

  --text-primary: #f7f8f8;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;
  --text-inverse: #0a0a0f;

  --accent-primary: #818cf8;
  --accent-primary-hover: #a5b4fc;
  --accent-primary-subtle: rgba(129, 140, 248, 0.1);
  --accent-primary-muted: rgba(129, 140, 248, 0.2);

  --accent-success: #4ade80;
  --accent-success-subtle: rgba(74, 222, 128, 0.1);

  --accent-warning: #fbbf24;
  --accent-warning-subtle: rgba(251, 191, 36, 0.1);

  --accent-danger: #f87171;
  --accent-danger-subtle: rgba(248, 113, 113, 0.1);

  --border-primary: rgba(255, 255, 255, 0.1);
  --border-secondary: rgba(255, 255, 255, 0.05);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 60px rgba(129, 140, 248, 0.2);
}

/* ============================================
   Base Styles & Reset
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* ============================================
   App Shell & Layout
   ============================================ */
.app-shell {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Header */
header.container-fluid {
  padding: var(--space-2xl) 0;
  border: none !important;
  background: transparent;
}

.theme-toggle-mini {
  height: var(--control-height-compact);
  padding: 0 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
  gap: 0;
}

.theme-toggle-mini .theme-icon {
  display: none;
  align-items: center;
  justify-content: center;
}

.theme-toggle-mini svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
}

:root[data-bs-theme="light"] .theme-toggle-mini .theme-icon-moon {
  display: inline-flex;
}

:root[data-bs-theme="dark"] .theme-toggle-mini .theme-icon-sun {
  display: inline-flex;
}

.header-flags {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  flex-wrap: wrap;
}

main.container-fluid {
  padding-left: 0;
  padding-right: 0;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

header p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 400px;
}

/* ============================================
   Cards - Glassmorphism Style
   ============================================ */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary) !important;
  border-radius: var(--radius-xl) !important;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-header {
  background: transparent !important;
  border-bottom: 1px solid var(--border-secondary) !important;
  padding: var(--space-lg) var(--space-xl);
}

.card-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin: 0;
}

.card-header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: var(--space-xs) 0 0;
}

.card-body {
  padding: var(--space-xl);
}

/* ============================================
   Header Layout - Three Column
   ============================================ */
.header-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xl);
  align-items: center;
}

.header-left {
  text-align: left;
}

.header-center {
  display: flex;
  justify-content: center;
}

.header-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-md);
}

/* ============================================
   Connection Card - Port Selection
   ============================================ */
.connection-card {
  background: var(--bg-elevated) !important;
  border-radius: var(--radius-lg) !important;
}

.connection-card .card-body {
  padding: var(--space-sm) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.connection-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--border-secondary);
}

.connection-status .status-label {
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
}

.connection-status .status-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.connection-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.connection-row .form-select {
  width: auto;
  min-width: 90px;
}

/* ============================================
   Status Card - Elegant Indicator
   ============================================ */
.status-card {
  background: var(--bg-elevated) !important;
  border-radius: var(--radius-lg) !important;
  padding: 0;
  min-width: 180px;
  overflow: hidden;
  position: relative;
  text-align: center;
}

.status-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--text-tertiary);
  transition: background var(--transition-base);
}

.status-card.connected::before {
  background: var(--accent-success);
}

.status-card .card-body {
  padding: var(--space-md) var(--space-lg);
}

.status-card .status-label {
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: 2px;
}

.status-card .status-value {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}

.status-card .status-detail {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  margin-top: 2px;
}

/* ============================================
   Buttons - Refined & Minimal
   ============================================ */
.btn {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.875rem;
  height: var(--control-height);
  padding: 0 1.25rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::after {
  opacity: 0.1;
}

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

.btn-primary {
  background: var(--accent-primary);
  color: white;
  box-shadow: 0 2px 8px rgba(99, 91, 255, 0.25);
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  box-shadow: 0 4px 16px rgba(99, 91, 255, 0.35);
}

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

.btn-outline-secondary:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-primary);
}

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

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

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

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

.btn-sm {
  height: var(--control-height);
  padding: 0 1rem;
  font-size: 0.8125rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn:disabled::after {
  display: none;
}

/* ============================================
   Form Controls - Clean & Modern
   ============================================ */
.form-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.form-control,
.form-select {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
  outline: none;
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-subtle);
}

.form-control::placeholder {
  color: var(--text-tertiary);
}

.form-control[readonly] {
  cursor: default;
  background: var(--bg-tertiary);
}

input.form-control,
input.form-control-sm {
  height: var(--control-height);
  padding: 0 1rem;
  line-height: calc(var(--control-height) - 2px);
}

.form-select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23697386' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 12px;
  padding-right: 2.5rem;
}

select.form-select:not([size]):not([multiple]),
select.form-select-sm:not([size]):not([multiple]) {
  height: var(--control-height);
  min-height: var(--control-height);
  padding-top: 0;
  padding-bottom: 0;
  line-height: calc(var(--control-height) - 2px);
}

.form-text {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: var(--space-sm);
}

/* ============================================
   Collapsible Cards
   ============================================ */
.collapsible-card .card-header.collapsible-header {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  transition: background var(--transition-fast);
}

.collapsible-header:hover {
  background: var(--bg-tertiary);
}

.collapsible-header .collapse-icon {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  transition: transform var(--transition-fast);
}

.collapsible-header[aria-expanded="true"] .collapse-icon {
  transform: rotate(90deg);
}

.collapsible-header h2 {
  margin: 0;
}

/* ============================================
   Configuration Layout
   ============================================ */
.config-layout {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.config-list-section {
  display: flex;
  flex-direction: column;
}

.config-list-section .form-select {
  min-height: 80px;
}

.config-actions-section {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.config-btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.config-btn-group .btn {
  min-width: 70px;
}

@media (max-width: 992px) {
  .config-layout {
    grid-template-columns: 1fr 1fr;
  }

  .config-actions-section {
    grid-column: span 2;
  }
}

@media (max-width: 576px) {
  .config-layout {
    grid-template-columns: 1fr;
  }

  .config-actions-section {
    grid-column: span 1;
  }
}

/* ============================================
   Utility Section
   ============================================ */
.utility-section h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ============================================
   Info Grid - Radio Information Display
   ============================================ */
.info-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.info-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
}

.info-item h3 {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-xs);
}

.info-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  background: transparent;
  border: none;
  padding: 0;
}

/* Legacy app-block (keep for backward compatibility) */
.app-block {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-secondary) !important;
  border-radius: var(--radius-md) !important;
  padding: var(--space-md) !important;
  color: var(--text-secondary);
  min-height: 100px;
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
}

/* ============================================
   Parameters Table - Clean Data Display
   ============================================ */
.table {
  --bs-table-bg: transparent;
  --bs-table-hover-bg: var(--accent-primary-subtle);
  margin: 0;
  border-collapse: separate;
  border-spacing: 0;
}

.table thead th {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
}

.table tbody td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-secondary);
  color: var(--text-primary);
  vertical-align: middle;
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.app-table-wrapper .table {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.parameter-row {
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.parameter-row:hover {
  background: var(--accent-primary-subtle);
}

.parameter-row.editing {
  background: var(--accent-primary-muted);
}

.parameter-row.unsaved {
  outline: 3px solid var(--accent-warning);
  outline-offset: -3px;
}

.parameter-row:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: -2px;
}

.parameter-row .value-display {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.param-name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.param-description {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
  line-height: 1.5;
}

.value-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  background: var(--accent-primary-subtle);
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.unsaved-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-warning);
  border: 1px solid var(--accent-warning);
  background: var(--accent-warning-subtle);
}

.parameter-row.editing .value-chip {
  background: var(--accent-primary-muted);
}

.value-hint {
  display: block;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

.edit-hint {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: var(--space-sm);
}

.parameter-value-cell {
  vertical-align: top;
}

.param-input {
  min-width: 160px;
  font-family: var(--font-mono);
}

.parameter-editor {
  display: none;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-secondary);
}

.parameter-row.editing .parameter-editor {
  display: flex;
}

.edit-hint::before {
  content: "→";
  opacity: 0.6;
}

.parameter-row.editing .edit-hint {
  display: none;
}

.parameter-editor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* ============================================
   Utility Tiles - Interactive Cards
   ============================================ */
.utility-tile {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-secondary) !important;
  border-radius: var(--radius-lg) !important;
  padding: var(--space-xl) !important;
  transition: all var(--transition-base);
}

.utility-tile:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary) !important;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.utility-tile h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.utility-tile p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.raw-input-row {
  display: flex;
  gap: var(--space-sm);
}

.raw-input-row input {
  flex: 1;
}

.raw-input-row .btn {
  flex-shrink: 0;
}

/* ============================================
   Activity Log - Floating Panel
   ============================================ */
.activity-log {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  width: min(380px, calc(100vw - 2rem));
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: 1090;
  overflow: hidden;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.activity-log.collapsed .activity-log-body {
  display: none;
}

.activity-log-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-secondary);
  background: var(--bg-tertiary);
}

.activity-log-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.activity-log-actions {
  display: flex;
  gap: var(--space-xs);
}

.activity-log-actions .btn {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.activity-log-actions .btn:hover {
  color: var(--accent-primary);
}

.activity-log-body {
  max-height: 200px;
  overflow-y: auto;
  padding: var(--space-md);
  background: var(--bg-secondary);
}

.activity-log-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.log-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  padding-left: var(--space-sm);
  border-left: 2px solid transparent;
}

.log-time {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.log-message {
  color: var(--text-secondary);
  flex: 1;
}

.log-info {
  border-color: var(--accent-primary);
}

.log-success {
  border-color: var(--accent-success);
}

.log-success .log-message {
  color: var(--accent-success);
}

.log-warning {
  border-color: var(--accent-warning);
}

.log-warning .log-message {
  color: var(--accent-warning);
}

.log-error {
  border-color: var(--accent-danger);
}

.log-error .log-message {
  color: var(--accent-danger);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-wrapper {
  z-index: 1100;
  pointer-events: none;
}

#toast {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 200px;
  padding: 0.875rem 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  opacity: 0;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  pointer-events: auto;
}

#toast.visible {
  opacity: 1;
  transform: translateY(0);
}

#toast[data-variant="error"] {
  background: var(--accent-danger);
  border-color: var(--accent-danger);
  color: white;
}

#toast[data-variant="success"] {
  background: var(--accent-success);
  border-color: var(--accent-success);
  color: white;
}

/* ============================================
   Global Loading Overlay
   ============================================ */
#global-loading {
  position: fixed;
  inset: 0;
  background: rgba(250, 251, 252, 0.85);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  z-index: 1200;
  color: var(--text-primary);
  font-weight: 500;
  transition: opacity var(--transition-base);
}

:root[data-bs-theme="dark"] #global-loading {
  background: rgba(10, 10, 15, 0.85);
}

#global-loading.d-none {
  display: none !important;
}

.spinner-border {
  width: 1.5rem;
  height: 1.5rem;
  border-width: 2px;
  border-color: var(--accent-primary);
  border-right-color: transparent;
}

/* ============================================
   Footer - Minimal & Clean
   ============================================ */
footer {
  padding: var(--space-2xl) 0;
  margin-top: var(--space-xl);
  text-align: center;
  border-top: 1px solid var(--border-secondary);
  background: transparent;
}

footer p {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin: 0;
  line-height: 2;
}

footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

footer a:hover {
  color: var(--accent-primary);
}

/* ============================================
   Theme Toggle Button
   ============================================ */
#theme-toggle {
  min-width: auto;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 500;
}

#theme-toggle [data-theme-label] {
  display: inline;
}

#theme-toggle::before {
  display: none;
}

/* ============================================
   Debug Mode Banner
   ============================================ */
.debug-banner {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  height: var(--control-height-compact);
  padding: 0 var(--space-md);
  background: var(--accent-warning-subtle);
  border: 1px solid var(--accent-warning);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent-warning);
}

.debug-banner.d-none {
  display: none !important;
}

.debug-link {
  color: var(--accent-warning);
  text-decoration: underline;
  font-weight: 600;
}

.debug-link:hover {
  color: var(--text-primary);
}

/* Demo Mode Link in Footer */
.demo-link {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.demo-link:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

/* ============================================
   Table States
   ============================================ */
.table tbody tr.updating {
  opacity: 0.5;
  pointer-events: none;
}

.table tbody tr.success {
  background: var(--accent-success-subtle);
}

.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-tertiary);
}

/* ============================================
   Configurations Section
   ============================================ */
#config-select {
  min-height: 120px;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 992px) {
  .header-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    text-align: center;
  }

  .header-left {
    text-align: center;
  }

  .header-right {
    justify-content: center;
    flex-wrap: wrap;
  }

  .connection-row {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .app-shell {
    padding: 0 var(--space-md);
  }

  header.container-fluid {
    padding: var(--space-xl) 0;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .card-body {
    padding: var(--space-lg);
  }

  .card-header {
    padding: var(--space-md) var(--space-lg);
  }

  .status-card {
    min-width: 100%;
  }
}

@media (max-width: 576px) {
  .activity-log {
    left: var(--space-md);
    right: var(--space-md);
    bottom: var(--space-md);
    width: auto;
  }

  .toast-wrapper {
    left: var(--space-md);
    right: var(--space-md);
    transform: none;
    width: auto;
  }

  #toast {
    width: 100%;
    justify-content: center;
  }

  .table thead th,
  .table tbody td {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.8125rem;
  }

  .param-name {
    font-size: 0.8125rem;
  }

  .param-description {
    font-size: 0.75rem;
  }

  #theme-toggle {
    min-width: auto;
  }

  .table-responsive {
    border-radius: var(--radius-md);
    border: 1px solid var(--border-primary);
  }
}

/* ============================================
   Focus & Accessibility
   ============================================ */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.btn:focus-visible {
  box-shadow: 0 0 0 3px var(--accent-primary-muted);
}

.form-control:focus,
.form-select:focus {
  box-shadow: 0 0 0 3px var(--accent-primary-subtle);
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

/* Button loading state */
.btn.loading {
  pointer-events: none;
  opacity: 0.8;
}

.btn.loading .spinner-border {
  width: 1rem;
  height: 1rem;
  margin-right: var(--space-sm);
}

/* Smooth scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ============================================
   Bootstrap Overrides
   ============================================ */
.row.g-3 {
  --bs-gutter-x: var(--space-lg);
  --bs-gutter-y: var(--space-lg);
}

.row.g-4 {
  --bs-gutter-x: var(--space-xl);
  --bs-gutter-y: var(--space-xl);
}

.gap-2 {
  gap: var(--space-sm) !important;
}

.gap-3 {
  gap: var(--space-md) !important;
}

.border-secondary-subtle {
  border-color: var(--border-primary) !important;
}

.text-secondary {
  color: var(--text-secondary) !important;
}

.bg-body {
  background-color: var(--bg-primary) !important;
}

.text-body {
  color: var(--text-primary) !important;
}

/* Status Card Theme Consistency */
.status-card {
  background-color: var(--bg-elevated);
  border-color: var(--border-primary);
}

/* Heading Colors */
h1,
h2,
h3,
h4,
h5,
h6,
.h1,
.h2,
.h3,
.h4,
.h5,
.h6 {
  color: var(--text-primary);
}

/* Parameter Input Styling */
.param-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-subtle);
}