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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 10px;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    color: white;
}

header h1 {
    font-size: 24px;
    font-weight: 600;
}

main {
    padding-bottom: 30px;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card h2 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #667eea;
}

.card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: #667eea;
}

.card p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-sheet {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    margin-bottom: 10px;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: #f1f3f4;
    color: #333;
}

.btn-secondary:hover {
    background: #e8eaed;
}

.btn-sheet {
    background: white;
    color: #333;
    border: 2px solid #e8eaed;
    text-align: left;
    padding: 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.btn-sheet:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.btn-sheet span {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Camera */
.camera-container {
    position: relative;
    overflow: hidden;
    padding: 0;
}

#video {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px 12px 0 0;
}

#video canvas,
#video video {
    width: 100% !important;
    height: auto !important;
    display: block;
    border-radius: 12px 12px 0 0;
}

.status-text {
    text-align: center;
    padding: 15px;
    background: #f8f9ff;
    color: #667eea;
    font-weight: 500;
}

/* Input Group */
.input-group {
    display: flex;
    gap: 10px;
}

.input-group input {
    flex: 1;
    padding: 12px;
    border: 2px solid #e8eaed;
    border-radius: 8px;
    font-size: 16px;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
}

.input-group .btn-primary {
    flex: 0 0 auto;
    width: auto;
    margin-bottom: 0;
}

/* Recent Scans */
.recent-scans {
    max-height: 300px;
    overflow-y: auto;
}

.scan-item {
    padding: 12px;
    background: #f8f9ff;
    border-radius: 8px;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.scan-item.success {
    background: #d4edda;
    border-left: 4px solid #28a745;
}

.scan-item.error {
    background: #f8d7da;
    border-left: 4px solid #dc3545;
}

.scan-code {
    font-weight: 600;
    font-size: 16px;
    color: #333;
}

.scan-time {
    font-size: 12px;
    color: #666;
}

/* Status Message */
.status-message {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    padding: 15px 25px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: none;
    z-index: 1000;
    max-width: 90%;
    text-align: center;
}

.status-message.show {
    display: block;
    animation: slideUp 0.3s ease;
}

.status-message.success {
    background: #28a745;
    color: white;
}

.status-message.error {
    background: #dc3545;
    color: white;
}

@keyframes slideUp {
    from {
        transform: translateX(-50%) translateY(100px);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

/* Info Text */
.info-text {
    color: #667eea;
    font-weight: 500;
    margin-bottom: 15px;
}

/* Sheets List */
#sheetsList {
    margin-bottom: 15px;
    max-height: 400px;
    overflow-y: auto;
}

/* Loading State */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Mobile Optimizations */
@media (max-width: 480px) {
    header h1 {
        font-size: 20px;
    }
    
    .card {
        padding: 15px;
    }
    
    .btn-primary, .btn-secondary {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* Dark areas for camera scanning */
.drawingBuffer {
    position: absolute;
    top: 0;
    left: 0;
}

/* Detection Overlay */
.detection-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(40, 167, 69, 0.95);
    color: white;
    padding: 20px 30px;
    border-radius: 12px;
    font-size: 24px;
    font-weight: bold;
    text-align: center;
    display: none;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: pulse 0.5s ease-in-out;
}

.detection-overlay.show {
    display: block;
}

.detection-overlay.invalid {
    background: rgba(255, 193, 7, 0.95);
}

/* Live read panel */
.live-read {
    display: block;
    background: #fffbe6;
    border: 1px solid #ffe58f;
    color: #614700;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 12px;
}

/* Modal for prompting additional info */
.modal {
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}
.modal-content {
    background: white;
    padding: 18px;
    border-radius: 10px;
    width: 90%;
    max-width: 420px;
}
.modal-content input {
    width: 100%;
    padding: 10px;
    margin-top: 6px;
    margin-bottom: 8px;
    border-radius: 6px;
    border: 1px solid #e8eaed;
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.05);
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
}