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

body {
    font-family: 'HelveticaNeue', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: #f1f1f1;
    min-height: 100vh;
    padding: 20px;
    color: #000000;
}

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

header {
    text-align: center;
    background: #ffffff;
    color: #ff1a57;
    margin-bottom: 30px;
    padding: 30px 20px;
    border-radius: 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2em;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1.1em;
    color: #000000;
    opacity: 0.8;
}

.card {
    background: white;
    border-radius: 4px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-left: 4px solid #ff1a57;
}

.card h2 {
    font-size: 1.3em;
    margin-bottom: 15px;
    color: #000000;
    font-weight: 700;
}

.scan-description {
    font-size: 0.9em;
    color: #666;
    margin-bottom: 15px;
    text-align: center;
}

/* Upload Section */
.upload-section {
    text-align: center;
}

input[type="file"] {
    display: none;
}

.upload-btn {
    display: inline-block;
    background: #ff1a57;
    color: white;
    padding: 15px 30px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.upload-btn:hover {
    background: #e6174e;
    box-shadow: 0 2px 8px rgba(255, 26, 87, 0.3);
}

.btn-clear {
    display: inline-block;
    background: #6c757d;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.2s ease;
    margin-top: 10px;
}

.btn-clear:hover {
    background: #5a6268;
    box-shadow: 0 2px 8px rgba(108, 117, 125, 0.3);
}

.status-message {
    margin-top: 15px;
    padding: 10px;
    border-radius: 8px;
    font-weight: 500;
}

.status-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Scanner Section */
.scanner-controls {
    margin-bottom: 15px;
    text-align: center;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 4px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    margin: 5px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: #ff1a57;
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: #e6174e;
    box-shadow: 0 2px 8px rgba(255, 26, 87, 0.3);
}

.btn-secondary {
    background: #0091da;
    color: white;
}

.btn-secondary:hover {
    background: #007ab8;
    box-shadow: 0 2px 8px rgba(0, 145, 218, 0.3);
}

.scanner-container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    border-radius: 10px;
    overflow: hidden;
}

#reader {
    border: 3px solid #ff1a57;
    border-radius: 4px;
}

#reader video {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Manual Entry */
.manual-entry {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

#manualInput {
    flex: 1;
    min-width: 200px;
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 4px;
    font-size: 1em;
    transition: border-color 0.2s ease;
}

#manualInput:focus {
    outline: none;
    border-color: #ff1a57;
}

#manualInput:disabled {
    background: #f5f5f5;
    cursor: not-allowed;
}

/* Results Section */
.results-card {
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-success {
    background: #d4edda;
    border-left: 5px solid #28a745;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 15px;
}

.result-error {
    background: #f8d7da;
    border-left: 5px solid #dc3545;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 15px;
}

.result-icon {
    font-size: 3em;
    text-align: center;
    margin-bottom: 15px;
}

.result-text {
    font-size: 1.2em;
    font-weight: 600;
    margin-bottom: 10px;
    text-align: center;
}

.result-serial {
    font-family: 'Courier New', monospace;
    font-size: 1.5em;
    font-weight: bold;
    text-align: center;
    padding: 15px;
    background: rgba(0,0,0,0.05);
    border-radius: 8px;
    margin-top: 10px;
}

/* Serial Numbers List */
.serial-count {
    background: #fff0f5;
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 15px;
    font-weight: 600;
    color: #ff1a57;
    text-align: center;
}

.serial-list {
    max-height: 300px;
    overflow-y: auto;
    background: #f8f9fa;
    border-radius: 4px;
    padding: 15px;
}

.serial-item {
    padding: 10px;
    background: white;
    margin-bottom: 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    border-left: 3px solid #ff1a57;
}

/* Scan History */
.history-count {
    background: #fff9e6;
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 15px;
    font-weight: 600;
    color: #333;
    text-align: center;
    line-height: 1.6;
}

.history-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.btn-history {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.2s ease;
    background: #0091da;
    color: white;
}

.btn-history:hover {
    background: #007ab8;
    box-shadow: 0 2px 8px rgba(0, 145, 218, 0.3);
}

.btn-history-clear {
    background: #6c757d;
}

.btn-history-clear:hover {
    background: #5a6268;
    box-shadow: 0 2px 8px rgba(108, 117, 125, 0.3);
}

.history-list {
    max-height: 400px;
    overflow-y: auto;
    background: #f8f9fa;
    border-radius: 4px;
    padding: 15px;
}

.history-item {
    padding: 12px;
    background: white;
    margin-bottom: 10px;
    border-radius: 4px;
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 10px;
    align-items: center;
    font-size: 0.95em;
}

.history-item-found {
    border-left: 4px solid #28a745;
}

.history-item-not-found {
    border-left: 4px solid #dc3545;
}

.history-serial {
    font-family: 'Courier New', monospace;
    font-weight: bold;
    color: #333;
}

.history-status {
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
    white-space: nowrap;
}

.history-item-found .history-status {
    color: #28a745;
    background: #d4edda;
}

.history-item-not-found .history-status {
    color: #dc3545;
    background: #f8d7da;
}

.history-date {
    font-size: 0.85em;
    color: #666;
    white-space: nowrap;
}

@media (max-width: 600px) {
    .history-item {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .history-status,
    .history-date {
        font-size: 0.9em;
    }
}

/* Responsive Design */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 1.5em;
    }

    .card {
        padding: 20px;
    }

    .card h2 {
        font-size: 1.1em;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9em;
    }

    .manual-entry {
        flex-direction: column;
    }

    #manualInput {
        width: 100%;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 26, 87, 0.3);
    border-radius: 50%;
    border-top-color: #ff1a57;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}