:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --ink: #12203a;
  --accent: #1c7c54;
  --muted: #5f6b7a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: radial-gradient(circle at top left, #dce8ff, var(--bg) 45%);
  color: var(--ink);
}

.app {
  max-width: 780px;
  margin: 0 auto;
  padding: 24px 16px 32px;
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 4px;
}

.lang-select-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-select-wrap label {
  color: var(--muted);
  font-size: 0.9rem;
}

#langSelect {
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid #dce3ef;
  background: var(--card);
  color: var(--ink);
  font-size: 0.95rem;
  cursor: pointer;
}

h1 {
  margin: 0;
}

.hint {
  color: var(--muted);
  margin-bottom: 16px;
}

.actions {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

button {
  border: 0;
  padding: 10px 14px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

#startBtn {
  background: var(--accent);
  color: #fff;
}

#stopBtn {
  background: #e4e7ec;
  color: #2e3642;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.scanner-card,
.result-card {
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(10, 22, 44, 0.08);
  padding: 14px;
}

.scanner-card {
  margin-bottom: 14px;
}

#reader {
  position: relative;
  width: 100%;
  min-height: 280px;
  overflow: hidden;
}

#scanOverlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 5;
}

.overlay-box {
  position: absolute;
  border: 2px dashed rgba(255, 255, 255, 0.85);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.25) inset;
}

.overlay-box::after {
  content: attr(data-label);
  position: absolute;
  top: -18px;
  left: 0;
  font-size: 11px;
  line-height: 1;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  padding: 2px 4px;
  border-radius: 4px;
}

.overlay-qr {
  border-color: #00d084;
}

.overlay-scan {
  border-color: #4ea8ff;
}

.overlay-hit {
  border-color: #ffb020;
}

.result-card h2 {
  margin: 4px 0 8px;
}

#status {
  margin: 0 0 10px;
  color: var(--muted);
}

#decodedText {
  margin: 0;
  padding: 12px;
  min-height: 72px;
  background: #f7f9fc;
  border: 1px solid #dce3ef;
  border-radius: 8px;
  white-space: pre-wrap;
  word-break: break-word;
}

@media (max-width: 640px) {
  .actions {
    flex-direction: column;
  }
}