/**
 * Unified Panel System
 * Shared styles for all panels (Settings, Activity, Satellites)
 * Mobile: Full-page slide-in | Desktop: Floating panels
 */

/* ==========================================================================
   Panel Container
   ========================================================================== */

/* Base panel styles - internal layout only, positioning handled by split-view or mobile.css */
.panel {
  display: none;
  flex-direction: column;
  background: var(--bg);
  overflow: hidden;
}

.panel.visible {
  display: flex;
}

/* Desktop: panels render inside .side-panel-content via split-view.js
   No positioning rules here - just fill the container */
@media (min-width: 1024px) {
  .panel {
    /* Inside side-panel, just fill the space */
    width: 100%;
    height: 100%;
    max-height: 100%;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: var(--bg);
  }
  
  .panel.visible {
    display: flex;
    animation: panel-fade-in 0.2s ease-out;
  }
}

@keyframes panel-fade-in {
  from {
    opacity: 0;
    transform: scale(0.97);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Mobile: Full-page slide-in (< 1024px breakpoint to match split-view) */
@media (max-width: 1023px) {
  .panel {
    position: fixed !important;
    inset: 0 !important;
    width: 100% !important;
    height: 100% !important;
    max-width: 100% !important;
    max-height: 100% !important;
    border-radius: 0 !important;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--bg) !important;
    z-index: var(--z-sticky) !important;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }

  .panel.visible {
    display: flex !important;
    flex-direction: column;
    transform: translateX(0);
  }
}

/* ==========================================================================
   Panel Header
   ========================================================================== */

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 1;
  flex-shrink: 0;
}

.panel-title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.panel-close {
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: var(--text-xl);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: color 0.2s, background 0.2s;
}

.panel-close:hover {
  color: var(--text);
  background: var(--white-10);
}

.panel-close:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ==========================================================================
   Panel Content
   ========================================================================== */

.panel-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) var(--space-5);
  -webkit-overflow-scrolling: touch;
}

/* Scrollbar styling for panel content */
.panel-content::-webkit-scrollbar {
  width: 6px;
}

.panel-content::-webkit-scrollbar-track {
  background: transparent;
}

.panel-content::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.panel-content::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================================================
   Panel Row (Settings-style rows)
   ========================================================================== */

.panel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border);
}

.panel-row:last-child {
  border-bottom: none;
}

.panel-row-info {
  flex: 1;
  min-width: 0; /* Allow text truncation */
}

.panel-row-label {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--text);
}

.panel-row-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

@media (max-width: 768px) {
  .panel-row {
    padding: var(--space-4) var(--space-5);
    min-height: 60px;
    margin: 0 calc(-1 * var(--space-5)); /* Extend to edges */
  }
}

/* ==========================================================================
   Panel Tabs
   ========================================================================== */

.panel-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  padding: 0 var(--space-4);
  flex-shrink: 0;
}

.panel-tab {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  min-height: 44px; /* Touch-friendly */
}

.panel-tab:hover {
  color: var(--text);
  background: var(--white-05);
}

.panel-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.panel-tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

/* ==========================================================================
   Panel List Items (Satellites-style)
   ========================================================================== */

.panel-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-1) 0;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.2s;
  border: 1px solid transparent;
  min-height: 44px; /* Touch-friendly */
}

.panel-item:hover {
  background: var(--white-05);
}

.panel-item.active {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--accent);
}

.panel-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.panel-item-icon {
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.panel-item-name {
  flex: 1;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text);
  min-width: 0; /* Allow text truncation */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.panel-item-badge {
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-input);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.panel-item-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  flex-shrink: 0;
}

.panel-item-status.offline {
  background: var(--text-muted);
}

.panel-item-status.error {
  background: var(--error);
}

/* ==========================================================================
   Panel Actions (bottom area)
   ========================================================================== */

.panel-actions {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
}

.panel-btn {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--accent);
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  min-height: 44px; /* Touch-friendly */
}

.panel-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.panel-btn:active {
  transform: translateY(0);
}

.panel-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.panel-btn.secondary:hover {
  background: var(--white-05);
  border-color: var(--text-muted);
}

.panel-btn + .panel-btn {
  margin-top: var(--space-2);
}

/* Inline action buttons */
.panel-actions-inline {
  display: flex;
  gap: var(--space-2);
}

.panel-actions-inline .panel-btn {
  flex: 1;
}

/* ==========================================================================
   Panel Empty State
   ========================================================================== */

.panel-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  text-align: center;
  color: var(--text-muted);
}

.panel-empty-icon {
  font-size: 2rem;
  margin-bottom: var(--space-3);
  opacity: 0.5;
}

.panel-empty-text {
  font-size: var(--text-sm);
}

/* ==========================================================================
   Panel Loading State
   ========================================================================== */

.panel-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}

.panel-loading::after {
  content: '';
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: panel-spin 0.8s linear infinite;
}

@keyframes panel-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ==========================================================================
   Panel Section Headers
   ========================================================================== */

.panel-section {
  margin-top: var(--space-6);
}

.panel-section:first-child {
  margin-top: 0;
}

.panel-section-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
  padding: 0 var(--space-1);
}

/* ==========================================================================
   Panel Divider
   ========================================================================== */

.panel-divider {
  height: 1px;
  background: var(--border);
  margin: var(--space-4) 0;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

/* Tablet adjustments (still mobile behavior until 1024px) */
@media (min-width: 481px) and (max-width: 1023px) {
  .panel-content {
    padding: var(--space-5) var(--space-6);
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .panel {
    transition: none;
  }

  .panel-btn {
    transition: none;
  }

  .panel-loading::after {
    animation: none;
  }
}