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

:root {
  --primary: #6C5CE7;
  --primary-light: #A29BFE;
  --primary-dark: #4834D4;
  --accent: #00CEC9;
  --accent-light: #55EFC4;
  --bg: #0F0E17;
  --bg-card: #1A1A2E;
  --bg-input: #16213E;
  --text: #FFFFFE;
  --text-muted: #A7A9BE;
  --danger: #FF6B6B;
  --success: #00B894;
  --warning: #FDCB6E;
  --cell-size: min(13vw, 56px);
  --radius: 12px;
  --radius-sm: 8px;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

#app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  max-width: 500px;
  margin: 0 auto;
}

header {
  text-align: center;
  padding: 12px 0;
  width: 100%;
}

.logo {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: 4px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#view-container {
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: fadeIn 0.3s ease;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  min-height: 48px;
  min-width: 48px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--text);
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(108, 92, 231, 0.6);
}

.btn-secondary {
  background: var(--bg-input);
  color: var(--text);
  border: 2px solid var(--primary);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #00B894);
  color: var(--bg);
  box-shadow: 0 4px 15px rgba(0, 206, 201, 0.4);
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.85rem;
}

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

input[type="text"] {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-input);
  border: 2px solid transparent;
  border-radius: var(--radius);
  color: var(--text);
  font-size: 1.1rem;
  outline: none;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  border-color: var(--primary);
}

input[type="text"]::placeholder {
  color: var(--text-muted);
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-host {
  background: var(--warning);
  color: var(--bg);
}

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

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  color: var(--text);
  padding: 12px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--primary);
  font-size: 0.9rem;
  z-index: 100;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translate(-50%, 20px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.timer {
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  text-align: center;
  padding: 8px 0;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

.shake {
  animation: shake 0.3s ease;
}

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* WebSocket connection indicator */
.ws-indicator {
  position: fixed;
  top: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  z-index: 200;
  transition: opacity 0.3s, transform 0.3s;
}

.ws-indicator.ws-hidden {
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
}

.ws-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.ws-connected {
  background: rgba(0, 184, 148, 0.15);
  color: var(--success);
}

.ws-connected .ws-dot {
  background: var(--success);
}

.ws-disconnected {
  background: rgba(255, 107, 107, 0.15);
  color: var(--danger);
  animation: pulse 1.5s ease infinite;
}

.ws-disconnected .ws-dot {
  background: var(--danger);
}

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