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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 30px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

header h1 {
    color: #667eea;
    font-size: 2.5em;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
}

.form-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 30px;
}

#dateForm {
    display: flex;
    gap: 20px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.form-group {
    flex: 1;
    min-width: 200px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-group input[type="date"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input[type="date"]:focus {
    outline: none;
    border-color: #667eea;
}

button[type="submit"] {
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
}

button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

button[type="submit"]:active {
    transform: translateY(0);
}

button[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.loading {
    text-align: center;
    padding: 40px;
}

.loading.hidden {
    display: none;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    background: #fee;
    color: #c33;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    border-left: 4px solid #c33;
}

.error.hidden {
    display: none;
}

.results {
    margin-top: 30px;
}

.results.hidden {
    display: none;
}

.results h2 {
    color: #667eea;
    margin-bottom: 15px;
}

.results-info {
    margin-bottom: 20px;
    padding: 10px;
    background: #f0f0f0;
    border-radius: 6px;
    font-weight: 600;
    color: #555;
}

.missing-info {
    margin-top: 20px;
    margin-bottom: 20px;
    padding: 15px;
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    border-radius: 6px;
}

.missing-info h3 {
    color: #856404;
    margin-bottom: 10px;
    font-size: 1.1em;
}

.missing-numbers {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.missing-number {
    padding: 5px 10px;
    background: #fff;
    border: 1px solid #ffc107;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
    color: #856404;
}

.table-container {
    overflow-x: auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

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

th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
}

td {
    padding: 12px 15px;
    border-bottom: 1px solid #e0e0e0;
}

tbody tr:hover {
    background: #f8f9fa;
}

tbody tr:last-child td {
    border-bottom: none;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header h1 {
        font-size: 1.8em;
    }

    #dateForm {
        flex-direction: column;
    }

    .form-group {
        width: 100%;
    }

    button[type="submit"] {
        width: 100%;
    }

    .table-container {
        font-size: 14px;
    }

    th, td {
        padding: 8px;
    }
}