:root {
  --bg-color: #0f172a;
  --surface-color: #1e293b;
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --accent-color: #10b981;
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  background-image: 
    radial-gradient(circle at top right, #1e3a8a 0%, transparent 40%),
    radial-gradient(circle at bottom left, #064e3b 0%, transparent 40%);
  background-attachment: fixed;
}

.app-container {
  width: 100%;
  max-width: 480px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 32px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

header {
  text-align: center;
  margin-bottom: 8px;
}

h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 14px;
}

.status-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0,0,0,0.2);
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--border-color);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--text-muted);
  transition: all 0.3s ease;
}

.dot.connected {
  background-color: var(--accent-color);
  box-shadow: 0 0 12px var(--accent-color);
}

.dot.buffering {
  background-color: #f59e0b;
  box-shadow: 0 0 12px #f59e0b;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.7; }
  100% { transform: scale(1); opacity: 1; }
}

.recovery-badge {
  font-size: 12px;
  color: #f59e0b;
  background: rgba(245, 158, 11, 0.1);
  padding: 4px 8px;
  border-radius: 12px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.recovery-badge.show {
  opacity: 1;
  visibility: visible;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pairing-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

.text-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text-main);
  font-size: 14px;
}

.text-input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.slider-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--surface-color);
  border-radius: 4px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.btn-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

body.qr-open {
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
}

button {
  flex: 1;
  padding: 14px;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  color: white;
}

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

.btn-connect:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
}

.btn-connect:disabled {
  background-color: var(--surface-color);
  color: var(--text-muted);
  cursor: not-allowed;
  transform: none;
}

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

.btn-connect.secondary:hover {
  background-color: rgba(59, 130, 246, 0.12);
}

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

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

.stats {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.hidden {
  display: none !important;
}

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

.pairing-target {
  text-align: center;
  font-size: 13px;
  color: #f59e0b;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 12px;
  padding: 10px 12px;
}

.pairing-actions {
  margin-top: 4px;
}

.qr-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(2, 6, 23, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.qr-modal-panel {
  width: min(100%, 420px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.65);
}

.qr-modal-panel h2 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.qr-status {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5;
}

.qr-cancel {
  margin-top: 4px;
}

.qr-scanner {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: #000;
  aspect-ratio: 1 / 1;
}

.qr-scanner video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.qr-viewfinder {
  position: absolute;
  inset: 12%;
  border: 2px solid rgba(255, 255, 255, 0.92);
  border-radius: 16px;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.45);
  pointer-events: none;
}

.qr-hint {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px;
  text-align: center;
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
}

.qr-fallback {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.qr-scanning .qr-viewfinder {
  animation: viewfinder-pulse 1.6s ease-in-out infinite;
}

@keyframes viewfinder-pulse {
  0%, 100% { border-color: rgba(255, 255, 255, 0.92); }
  50% { border-color: rgba(59, 130, 246, 0.95); }
}

.device-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: min(50vh, 320px);
  overflow-y: auto;
}

.connect-empty {
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
  padding: 24px 12px;
}

.device-row {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.22);
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.device-row:hover {
  border-color: var(--primary-color);
  background: rgba(59, 130, 246, 0.12);
}

.device-row-title {
  font-size: 15px;
  font-weight: 600;
}

.device-row-meta {
  font-size: 12px;
  color: var(--text-muted);
  word-break: break-all;
}