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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.2em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

header p {
    font-size: 1.1em;
    opacity: 0.9;
}

.card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.card h2 {
    color: #333;
    margin-bottom: 20px;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.coin-select {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 2px solid #ddd;
    border-radius: 8px;
    margin-bottom: 20px;
    cursor: pointer;
}

.coin-info {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 10px;
    margin-top: 15px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.info-grid div {
    padding: 8px;
    background: white;
    border-radius: 6px;
}

.btn {
    padding: 12px 30px;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin: 10px;
    transition: transform 0.2s;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
}

.btn-record {
    background: #dc3545;
    color: white;
}

.btn-test {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

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

.status {
    margin-top: 15px;
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
}

.result {
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    text-align: center;
}

.result.authentic {
    background: #d4edda;
    border: 2px solid #28a745;
    color: #155724;
}

.result.fake {
    background: #f8d7da;
    border: 2px solid #dc3545;
    color: #721c24;
}

.hidden {
    display: none;
}

canvas {
    max-width: 100%;
    margin-top: 20px;
    background: #fafafa;
    border-radius: 8px;
}

.peaks-info {
    margin-top: 15px;
    padding: 12px;
    background: #e7f3ff;
    border-radius: 8px;
    font-family: monospace;
    font-size: 14px;
}

.tolerance-control {
    text-align: center;
    padding: 10px;
}

.tolerance-control input {
    width: 80%;
    margin: 10px 0;
}

.help-text {
    font-size: 12px;
    color: #666;
    margin-top: 10px;
    text-align: center;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    .card {
        padding: 18px;
    }
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    header h1 {
        font-size: 1.6em;
    }
}