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

  body {
    font-family: "Arial", sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
  }

  .container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 30px;
    max-width: 700px;
    width: 100%;
  }

  h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 28px;
  }

  .step-container {
    display: none;
  }

  .step-container.active {
    display: block;
  }

  .camera-container {
    position: relative;
    width: 100%;
    max-width: 640px;
    margin: 0 auto 20px;
    border-radius: 15px;
    overflow: hidden;
    background: #000;
  }

  #videoElement {
    width: 100%;
    height: auto;
    display: block;
    transform: scaleX(-1);
  }

  #captureCanvas {
    display: none;
  }

  #overlayCanvas {
    display: block;
    max-width: 100%;
    height: auto;
  }

  .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
  }

  .face-guide-oval {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 260px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
    transition: all 0.3s ease;
  }

  .face-guide-oval.aligned {
    border-color: #4caf50;
    border-width: 4px;
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.5);
  }

  .face-guide-oval.detecting {
    border-color: #ffc107;
    animation: pulse 1.5s ease-in-out infinite;
  }

  @keyframes pulse {
    0%,
    100% {
      opacity: 0.5;
      transform: translate(-50%, -50%) scale(1);
    }
    50% {
      opacity: 1;
      transform: translate(-50%, -50%) scale(1.05);
    }
  }

  .alignment-status {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 14px;
    text-align: center;
    min-width: 250px;
    font-weight: 600;
    letter-spacing: 0.5px;
    z-index: 10;
  }

  .alignment-status.aligned {
    background: linear-gradient(135deg, #4caf50, #66bb6a);
    animation: glow 0.5s ease;
  }

  .alignment-status.misaligned {
    background: linear-gradient(135deg, #f44336, #ef5350);
  }

  .alignment-status.capturing {
    background: linear-gradient(135deg, #2196f3, #42a5f5);
  }

  @keyframes glow {
    0% {
      box-shadow: 0 0 5px rgba(76, 175, 80, 0.5);
    }
    50% {
      box-shadow: 0 0 20px rgba(76, 175, 80, 0.8);
    }
    100% {
      box-shadow: 0 0 5px rgba(76, 175, 80, 0.5);
    }
  }

  .progress-container {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    display: none;
    background: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border-radius: 15px;
    z-index: 10;
  }

  .progress-container.active {
    display: block;
    animation: slideUp 0.3s ease;
  }

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

  .progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 10px;
  }

  .progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4caf50, #8bc34a, #cddc39);
    border-radius: 10px;
    width: 0%;
    transition: width 0.1s linear;
    box-shadow: 0 0 10px rgba(76, 175, 80, 0.7);
  }

  .progress-text {
    text-align: center;
    color: white;
    font-size: 13px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
  }

  .countdown {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 72px;
    font-weight: bold;
    color: white;
    text-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    display: none;
    animation: countdownPulse 1s ease;
    z-index: 10;
  }

  @keyframes countdownPulse {
    0% {
      transform: translate(-50%, -50%) scale(1.5);
      opacity: 0;
    }
    50% {
      transform: translate(-50%, -50%) scale(1);
      opacity: 1;
    }
    100% {
      transform: translate(-50%, -50%) scale(0.9);
      opacity: 0.8;
    }
  }

  .result-container {
    text-align: center;
    animation: fadeIn 0.5s ease;
  }

  @keyframes fadeIn {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }

  .result-container img,
  .result-container canvas {
    max-width: 100%;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 20px;
    display: block;
    margin-left: auto;
    margin-right: auto;
  }

  .controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 20px;
  }

  button {
    padding: 12px 30px;
    font-size: 16px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  }

  .start-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
  }

  .start-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
  }

  .retake-btn {
    background: linear-gradient(135deg, #f44336, #e91e63);
    color: white;
  }

  .download-btn {
    background: linear-gradient(135deg, #4caf50, #66bb6a);
    color: white;
  }

  .instructions {
    background: linear-gradient(135deg, #f5f5f5, #e8e8e8);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    border-left: 4px solid #667eea;
  }

  .instructions h3 {
    color: #333;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .instructions ul {
    list-style: none;
    padding: 0;
  }

  .instructions li {
    padding: 8px 0;
    color: #555;
    position: relative;
    padding-left: 30px;
    line-height: 1.5;
  }

  .instructions li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4caf50;
    font-weight: bold;
    font-size: 18px;
  }

  .error-message {
    background: linear-gradient(135deg, #ff5252, #ff6b6b);
    color: white;
    padding: 15px;
    border-radius: 10px;
    margin-top: 20px;
    display: none;
    animation: shake 0.5s ease;
  }

  @keyframes shake {
    0%,
    100% {
      transform: translateX(0);
    }
    25% {
      transform: translateX(-10px);
    }
    75% {
      transform: translateX(10px);
    }
  }

  .frame-selector {
    display: flex;
    gap: 15px;
    margin: 20px 0;
    justify-content: center;
    flex-wrap: wrap;
  }

  .frame-option {
    width: 120px;
    padding: 10px;
    border: 3px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    background: #f5f5f5;
  }

  .frame-option:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  }

  .frame-option.selected {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
  }

  .frame-preview {
    width: 100%;
    height: 40px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
  }

  .adjustment-controls {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 20px;
    margin-top: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  }

  .slider-group {
    margin-bottom: 20px;
  }

  .slider-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-weight: 600;
  }

  .slider-value {
    color: #667eea;
    font-weight: bold;
    background: rgba(102, 126, 234, 0.1);
    padding: 3px 10px;
    border-radius: 12px;
  }

  input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
  }

  input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
  }

  input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
    border: none;
  }

  .measurements-panel {
    background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
    border-radius: 15px;
    padding: 20px;
    margin: 20px 0;
  }

  .measurement-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: white;
    border-radius: 10px;
    margin-bottom: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  }

  .measurement-label {
    font-weight: 600;
    color: #333;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
  }

  .measurement-value {
    font-size: 1.1em;
    font-weight: bold;
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    padding: 5px 15px;
    border-radius: 20px;
  }

  .measurement-section {
    margin-bottom: 20px;
  }

  .measurement-section-title {
    font-weight: bold;
    color: #667eea;
    margin-bottom: 10px;
    font-size: 15px;
    padding-left: 12px;
  }

  @media (max-width: 768px) {
    body {
      padding: 0;
      align-items: flex-start;
    }

    .container {
      padding: 15px;
      border-radius: 0;
      max-width: 100%;
      min-height: 100vh;
      box-shadow: none;
    }

    h1 {
      font-size: 20px;
      margin-bottom: 15px;
    }

    .instructions {
      padding: 15px;
      margin-bottom: 15px;
    }

    .instructions h3 {
      font-size: 16px;
      margin-bottom: 10px;
    }

    .instructions li {
      font-size: 13px;
      padding: 6px 0;
      padding-left: 25px;
    }

    .camera-container {
      border-radius: 10px;
      margin-bottom: 15px;
    }

    .face-guide-oval {
      width: 160px;
      height: 220px;
    }

    .alignment-status {
      top: 10px;
      font-size: 12px;
      padding: 10px 20px;
      min-width: 200px;
      max-width: 90%;
    }

    .progress-container {
      bottom: 20px;
      width: 90%;
      padding: 12px;
    }

    .progress-text {
      font-size: 11px;
    }

    .countdown {
      font-size: 56px;
    }

    .controls {
      flex-direction: column;
      gap: 10px;
    }

    button {
      width: 100%;
      padding: 14px 20px;
      font-size: 14px;
    }

    .frame-selector {
      gap: 10px;
      margin: 15px 0;
    }

    .frame-option {
      width: 90px;
      padding: 8px;
    }

    .frame-preview {
      height: 35px;
      margin-bottom: 5px;
    }

    .frame-option div:last-child {
      font-size: 12px;
    }

    .adjustment-controls {
      padding: 15px;
      margin-top: 15px;
    }

    .slider-group {
      margin-bottom: 15px;
    }

    .slider-label {
      font-size: 13px;
      margin-bottom: 6px;
    }

    .slider-value {
      font-size: 13px;
      padding: 2px 8px;
    }

    .measurements-panel {
      padding: 15px;
      margin: 15px 0;
    }

    .measurements-panel h3 {
      font-size: 16px;
      margin: 0 0 10px 0;
    }

    .measurement-row {
      padding: 10px;
      margin-bottom: 8px;
    }

    .measurement-label {
      font-size: 13px;
    }

    .measurement-value {
      font-size: 1em;
      padding: 4px 12px;
    }

    .error-message {
      font-size: 13px;
      padding: 12px;
      margin-top: 15px;
    }

    h2 {
      font-size: 18px !important;
      margin-bottom: 15px !important;
    }

    .measurement-section-title {
      font-size: 13px;
    }
  }

  @media (max-width: 480px) {
    h1 {
      font-size: 18px;
    }

    .face-guide-oval {
      width: 140px;
      height: 200px;
    }

    .alignment-status {
      font-size: 11px;
      padding: 8px 16px;
    }

    .frame-option {
      width: 80px;
    }
  }

  @media (max-width: 768px) and (orientation: landscape) {
    .container {
      padding: 10px;
    }

    .instructions {
      padding: 10px;
      margin-bottom: 10px;
    }

    .instructions li {
      font-size: 12px;
      padding: 4px 0;
    }

    .face-guide-oval {
      width: 120px;
      height: 180px;
    }

    .camera-container {
      margin-bottom: 10px;
    }

    .controls {
      flex-direction: row;
      justify-content: center;
    }

    button {
      width: auto;
      padding: 10px 20px;
    }
    #distance-box {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(20, 20, 20, 0.85);
  color: white;
  padding: 15px 20px;
  border-radius: 12px;
  font-family: sans-serif;
  width: 120px;
  text-align: left;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  backdrop-filter: blur(4px);
}

#distance-box .label {
  font-size: 14px;
  opacity: 0.7;
}

#distance-box #distance-value {
  font-size: 28px;
  font-weight: 700;
  margin: 5px 0;
}

#distance-box .target {
  font-size: 12px;
  opacity: 0.6;
}

  }