:root {
  --bg: #1a1a2e;
  --bg-secondary: #16213e;
  --surface: #0f3460;
  --accent: #e94560;
  --accent-green: #00d68f;
  --accent-blue: #3dc2ec;
  --accent-purple: #a855f7;
  --accent-yellow: #f5c542;
  --text: #eaeaea;
  --text-secondary: #8892a4;
  --border-radius: 12px;
}

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

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100%;
  overflow: hidden;
  -webkit-user-select: none;
  user-select: none;
}

/* --- Screens --- */

.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.screen.active {
  display: flex;
}

/* --- Welcome Screen --- */

.welcome-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.welcome-icon {
  color: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.08); opacity: 0.7; }
}

/* --- Button --- */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 16px 48px;
  border-radius: var(--border-radius);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, opacity 0.15s;
  position: relative;
  min-width: 180px;
}

.btn-primary:active {
  transform: scale(0.97);
  opacity: 0.9;
}

.btn-primary:disabled {
  cursor: wait;
  opacity: 0.8;
}

.btn-primary .btn-spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 2.5px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.btn-primary.loading .btn-icon {
  display: none;
}

.btn-primary.loading .btn-spinner {
  display: block;
}

.btn-primary.loading .btn-text {
  opacity: 0.7;
}

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

/* --- Camera Screen --- */

.video-container {
  position: absolute;
  inset: 0;
  background: #000;
  overflow: hidden;
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
}

.video-container canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* --- Switch Camera Button --- */

.btn-switch-cam {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s, opacity 0.2s;
}

.btn-switch-cam:active {
  transform: scale(0.9);
}

.btn-switch-cam.hidden {
  display: none;
}

/* --- Toast --- */

.toast {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(10px);
  color: #fff;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  z-index: 100;
  transition: opacity 0.3s, transform 0.3s;
  white-space: nowrap;
}

.toast.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(-10px);
}

.toast.capture-active {
  border: 1px solid var(--accent-yellow);
}

/* --- Stats Bar --- */

.stats-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-around;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  padding: 10px 16px;
  padding-bottom: max(10px, env(safe-area-inset-bottom));
  z-index: 50;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-label {
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* --- Error Screen --- */

.error-content {
  text-align: center;
  padding: 40px 24px;
  max-width: 360px;
}

.error-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  font-weight: 700;
  margin: 0 auto 20px;
}

.error-content p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.error-content .btn-primary {
  width: auto;
}