.scan-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.95);
  z-index: 1000;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}
.scan-modal.active {
  display: flex;
}
.scan-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
}
.scan-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 1px;
}
.scan-close {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  font-size: 20px;
  cursor: pointer;
  transition: all .2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.scan-close:hover {
  border-color: var(--error);
  color: var(--error);
}
.scan-viewport-wrapper {
  width: 100%;
  max-width: 640px;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  position: relative;
}
#scanViewport {
  width: 100%;
  height: 100%;
  min-height: 300px;
  max-height: 480px;
  object-fit: cover;
  border-radius: 12px;
  background: #000;
}
.scan-guide {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 70%;
  aspect-ratio: 17 / 6;
  pointer-events: none;
  z-index: 5;
}
.scan-guide-corner {
  position: absolute;
  width: 20px;
  height: 20px;
  border-color: var(--accent);
  border-style: solid;
  border-width: 0;
  transition: border-color .3s;
}
.scan-guide-corner.tl { top: 0; left: 0; border-top-width: 3px; border-left-width: 3px; border-top-left-radius: 6px; }
.scan-guide-corner.tr { top: 0; right: 0; border-top-width: 3px; border-right-width: 3px; border-top-right-radius: 6px; }
.scan-guide-corner.bl { bottom: 0; left: 0; border-bottom-width: 3px; border-left-width: 3px; border-bottom-left-radius: 6px; }
.scan-guide-corner.br { bottom: 0; right: 0; border-bottom-width: 3px; border-right-width: 3px; border-bottom-right-radius: 6px; }
.scan-guide-line {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  opacity: 0.6;
  box-shadow: 0 0 8px var(--accent);
  animation: scanLine 2s ease-in-out infinite;
}
.scan-guide.success .scan-guide-corner {
  border-color: var(--success);
  box-shadow: 0 0 12px var(--success);
}
.scan-guide.success .scan-guide-line {
  background: var(--success);
  box-shadow: 0 0 12px var(--success);
  animation: none;
  top: auto;
  bottom: 0;
}
@keyframes scanLine {
  0% { top: 0; opacity: 0.6; }
  50% { opacity: 1; }
  100% { top: calc(100% - 2px); opacity: 0.6; }
}
.scan-status {
  margin: 20px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: var(--text-dim);
  min-height: 24px;
  text-align: center;
}
.scan-status.error {
  color: var(--error);
}
.scan-status.success {
  color: var(--success);
}
.scan-status.timeout {
  color: var(--warn);
}
.scan-status.processing {
  color: var(--accent);
}
.scan-tips {
  margin: 0 20px 20px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  max-width: 640px;
  width: calc(100% - 40px);
}
.scan-tips h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.scan-tips ul {
  list-style: none;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.8;
}
.scan-tips li::before {
  content: '•';
  color: var(--accent);
  margin-right: 8px;
}
@media(max-width: 600px) {
  .scan-modal {
    height: 100dvh;
    height: 100vh;
    height: 100svh;
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
  }
  .scan-header {
    padding-top: calc(20px + env(safe-area-inset-top));
    padding-left: calc(20px + env(safe-area-inset-left));
    padding-right: calc(20px + env(safe-area-inset-right));
  }
  #scanViewport {
    min-height: 250px;
    max-height: 400px;
    border-radius: 0;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
  }
  .scan-tips {
    margin: 0 16px 16px;
    margin-bottom: calc(16px + env(safe-area-inset-bottom));
    width: calc(100% - 32px);
    max-height: 20vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .scan-tips ul {
    font-size: 12px;
    line-height: 1.6;
  }
  .scan-tips h4 {
    margin-bottom: 8px;
  }
  .scan-status {
    margin: 12px 0;
    font-size: 13px;
    white-space: pre-line;
  }
}