/* ==========================================================================
   PhoneApp Location Tracker - UI Styles
   Dark tech/terminal theme: near-black #0a0c10, panel #11151c, neon green #3dff9a, amber #ffb000
   Fonts: JetBrains Mono for headings/UI, Inter for body
   ========================================================================== */

/* CSS Custom Properties (Design Tokens) */
:root {
  /* Light theme (fallback) */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-elevated: #f1f5f9;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-primary: #3dff9a;
  --color-primary-fg: #0a0c10;
  --color-primary-dim: rgba(61, 255, 154, 0.15);
  --color-accent-amber: #ffb000;
  --color-accent-amber-dim: rgba(255, 176, 0, 0.15);
  --color-danger: #ef4444;
  --color-danger-dim: rgba(239, 68, 68, 0.15);
  --color-success: #3dff9a;
  --color-warning: #ffb000;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --transition-fast: 150ms ease-out;
  --transition-normal: 200ms ease-out;
  --transition-slow: 300ms ease-out;
}

/* Dark theme (default) */
html[data-theme="dark"] {
  --color-bg: #0a0c10;
  --color-surface: #11151c;
  --color-surface-elevated: #1a1f2a;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-border: #1f2937;
  --color-primary: #3dff9a;
  --color-primary-fg: #0a0c10;
  --color-primary-dim: rgba(61, 255, 154, 0.12);
  --color-accent-amber: #ffb000;
  --color-accent-amber-dim: rgba(255, 176, 0, 0.12);
  --color-danger: #f87171;
  --color-danger-dim: rgba(248, 113, 113, 0.12);
  --color-success: #3dff9a;
  --color-warning: #ffb000;
}

html[data-theme="light"] {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-elevated: #f1f5f9;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-primary: #22c55e;
  --color-primary-fg: #ffffff;
  --color-primary-dim: rgba(34, 197, 94, 0.15);
  --color-accent-amber: #f59e0b;
  --color-accent-amber-dim: rgba(245, 158, 11, 0.15);
  --color-danger: #ef4444;
  --color-danger-dim: rgba(239, 68, 68, 0.15);
  --color-success: #22c55e;
  --color-warning: #f59e0b;
}

/* Base styles */
* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'JetBrains Mono', 'IBM Plex Mono', monospace;
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: clamp(1.125rem, 2vw, 1.375rem); }

p {
  margin: 0 0 1em;
  max-width: 65ch;
}

code, kbd, pre, samp {
  font-family: 'JetBrains Mono', 'IBM Plex Mono', monospace;
  font-size: 0.875em;
}

kbd {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.125em 0.375em;
  font-size: 0.75em;
  box-shadow: 0 1px 0 var(--color-border);
}

/* Font loading */
@font-face {
  font-family: 'JetBrains Mono';
  src: url('https://fonts.gstatic.com/s/jetbrainsmono/v23/tDbY2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKk.woff2') format('woff2');
  font-weight: 400 700;
  font-display: swap;
}

@font-face {
  font-family: 'Inter';
  src: url('https://fonts.gstatic.com/s/inter/v18/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuLyfAZ9hiJ-Ek-_EeA.woff2') format('woff2');
  font-weight: 400 500 600;
  font-display: swap;
}

/* Layout */
.app-layout {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

@media (min-width: 1024px) {
  .app-layout {
    grid-template-columns: 320px 1fr;
    grid-template-rows: auto 1fr;
  }
}

/* Header / Top Bar */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  background: rgba(17, 21, 28, 0.9);
}

@media (min-width: 1024px) {
  .top-bar {
    grid-column: 1 / -1;
  }
}

.top-bar__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-text);
}

.top-bar__brand-icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.top-bar__brand-text {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.top-bar__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: 0;
  height: calc(100vh - 64px);
  overflow-y: auto;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (max-width: 1023px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 64px;
    width: 100%;
    height: calc(100vh - 64px);
    max-height: calc(100vh - 64px);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: 90;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  
  .sidebar.is-open {
    transform: translateX(0);
  }
}

.sidebar__section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sidebar__section-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-primary);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-fg);
  border-color: var(--color-primary);
}

.btn--primary:hover:not(:disabled) {
  background: var(--color-primary);
  filter: brightness(1.1);
}

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

.btn--secondary:hover:not(:disabled) {
  background: var(--color-border);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: transparent;
}

.btn--ghost:hover:not(:disabled) {
  background: var(--color-surface-elevated);
  color: var(--color-text);
}

.btn--danger {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}

.btn--danger:hover:not(:disabled) {
  filter: brightness(1.1);
}

.btn--sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
}

.btn--lg {
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
}

.btn--block {
  width: 100%;
}

.btn .icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Inputs */
.input-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.input-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.input {
  width: 100%;
  font-family: inherit;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.625rem 0.875rem;
  transition: all var(--transition-fast);
}

.input::placeholder {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-dim);
}

.input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.input--error:focus {
  box-shadow: 0 0 0 3px var(--color-danger-dim);
}

.input-error {
  font-size: 0.75rem;
  color: var(--color-danger);
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.card--elevated {
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.card-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

/* Connection Status Indicator */
.connection-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
}

.connection-status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-muted);
  transition: background var(--transition-fast);
}

.connection-status--connected .connection-status__dot {
  background: var(--color-success);
  box-shadow: 0 0 8px var(--color-success);
  animation: pulse 2s ease-in-out infinite;
}

.connection-status--connecting .connection-status__dot {
  background: var(--color-warning);
  animation: blink 1s ease-in-out infinite;
}

.connection-status--disconnected .connection-status__dot {
  background: var(--color-danger);
}

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

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* Floor Selector */
.floor-selector {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.floor-selector__label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.floor-selector__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.375rem;
}

.floor-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.floor-btn:hover:not(:disabled) {
  background: var(--color-border);
  color: var(--color-text);
  border-color: var(--color-primary);
}

.floor-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-primary);
}

.floor-btn--active {
  background: var(--color-primary);
  color: var(--color-primary-fg);
  border-color: var(--color-primary);
}

.floor-btn--has-users {
  position: relative;
}

.floor-btn--has-users::after {
  content: '';
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 6px var(--color-success);
}

.floor-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* User List */
.user-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 300px;
  overflow-y: auto;
}

.user-list__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.user-list__empty-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 0.75rem;
  opacity: 0.5;
}

.user-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.user-item:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
}

.user-item--current {
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
}

.user-item__avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary-dim);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.user-item__info {
  flex: 1;
  min-width: 0;
}

.user-item__name {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-item__meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.user-item__floor {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.125rem 0.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.625rem;
  font-weight: 600;
}

.user-item__status {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.user-item__status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-text-muted);
}

.user-item__status-dot--active {
  background: var(--color-success);
  box-shadow: 0 0 6px var(--color-success);
}

.user-item__status-dot--idle {
  background: var(--color-warning);
}

/* Share Panel */
.share-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.share-panel__link {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.share-panel__link-input {
  display: flex;
  gap: 0.5rem;
}

.share-panel__link-input .input {
  flex: 1;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
}

.share-panel__actions {
  display: flex;
  gap: 0.5rem;
}

/* QR Code */
.qr-code {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.qr-code__canvas {
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.qr-code__label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slideIn 0.3s ease-out;
  max-width: 360px;
}

.toast--success {
  border-left: 3px solid var(--color-success);
}

.toast--error {
  border-left: 3px solid var(--color-danger);
}

.toast--warning {
  border-left: 3px solid var(--color-warning);
}

.toast--info {
  border-left: 3px solid var(--color-primary);
}

.toast__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.toast--success .toast__icon { color: var(--color-success); }
.toast--error .toast__icon { color: var(--color-danger); }
.toast--warning .toast__icon { color: var(--color-warning); }
.toast--info .toast__icon { color: var(--color-primary); }

.toast__message {
  flex: 1;
  font-size: 0.875rem;
  color: var(--color-text);
}

.toast__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.toast__close:hover {
  background: var(--color-surface-elevated);
  color: var(--color-text);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Session Info */
.session-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.session-info__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.875rem;
}

.session-info__label {
  color: var(--color-text-muted);
}

.session-info__value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--color-text);
  word-break: break-all;
}

/* Main Content Area */
.main-content {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 0;
}

@media (min-width: 1024px) {
  .main-content {
    height: calc(100vh - 64px);
  }
}

.viewport-3d {
  width: 100%;
  height: 100%;
  min-height: 500px;
  background: var(--color-bg);
}

@media (max-width: 1023px) {
  .viewport-3d {
    min-height: calc(100vh - 64px);
  }
}

/* Mobile Sidebar Toggle */
.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background: var(--color-surface-elevated);
}

@media (min-width: 1024px) {
  .sidebar-toggle {
    display: none;
  }
}

/* Backdrop for mobile sidebar */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 80;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

@media (max-width: 1023px) {
  .sidebar-backdrop.is-visible {
    display: block;
    opacity: 1;
  }
}

/* Footer */
.footer {
  padding: 1rem 1.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

@media (min-width: 1024px) {
  .footer {
    grid-column: 1 / -1;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

::-webkit-scrollbar-track {
  background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

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

/* Focus visible polyfill */
:focus:not(:focus-visible) {
  outline: none;
}

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

.text-mono {
  font-family: 'JetBrains Mono', monospace;
}

.text-muted {
  color: var(--color-text-muted);
}

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

.text-danger {
  color: var(--color-danger);
}

.text-warning {
  color: var(--color-warning);
}

.text-success {
  color: var(--color-success);
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }

.w-full { width: 100%; }

.rounded-full { border-radius: 9999px; }

.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; }