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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #ffffff;
    min-height: 100vh;
    overflow: hidden;
}

.title {
    position: fixed;
    top: 20px;
    left: 20px;
    font-size: 24px;
    font-weight: 600;
    color: #ffffff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    z-index: 10;
}

.instructions {
    position: fixed;
    top: 70px;
    left: 20px;
    background: rgba(0, 0, 0, 0.75);
    padding: 15px;
    border-radius: 8px;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.instruction-title {
    font-size: 16px;
    font-weight: 600;
    color: #ffcc00;
    margin-bottom: 10px;
    border-bottom: 1px solid rgba(255, 204, 0, 0.3);
    padding-bottom: 5px;
}

.instruction-item {
    font-size: 13px;
    color: #ffffff;
    margin: 6px 0;
    line-height: 1.4;
}

.log-display {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: #00ff00;
    padding: 15px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    min-width: 200px;
    max-width: 300px;
    max-height: 400px;
    overflow-y: auto;
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    line-height: 1.5;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

#webcam {
    display: none;
}

#canvas {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
    background: #000;
}

.error-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 50, 50, 0.9);
    color: #ffffff;
    padding: 20px 40px;
    border-radius: 8px;
    font-size: 16px;
    text-align: center;
    max-width: 80%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.error-message.hidden {
    display: none;
}

.start-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.start-overlay.hidden {
    display: none;
}

.start-button {
    padding: 20px 40px;
    font-size: 20px;
    font-weight: 600;
    color: #ffffff;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
}

.start-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(102, 126, 234, 0.6);
}

.start-button:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}