.seo-checker-container {
    max-width: 900px;
    margin: 20px auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

.seo-checker-form {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
    align-items: center;
}

#seo-url {
    flex: 1;
    min-width: 250px;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border 0.3s;
}

#seo-url:focus {
    border-color: #4CAF50;
    outline: none;
}

.seo-btn {
    background-color: #4CAF50;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
    white-space: nowrap;
}

.seo-btn:hover {
    background-color: #45a049;
}

#seo-loading {
    text-align: center;
    font-size: 18px;
    color: #555;
    margin: 20px 0;
}

#seo-loading i {
    margin-right: 8px;
    color: #4CAF50;
}

.seo-report {
    background: #f9f9f9;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.seo-report h3 {
    margin-top: 0;
    color: #333;
    border-bottom: 2px solid #ddd;
    padding-bottom: 10px;
}

.seo-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

.seo-table th {
    text-align: left;
    padding: 12px 8px;
    background-color: #f0f0f0;
    font-weight: 600;
}

.seo-table td {
    padding: 10px 8px;
    border-bottom: 1px solid #e0e0e0;
}

.seo-status-cell {
    text-align: center;
    width: 50px;
}

.seo-icon-good {
    color: #4CAF50;
    font-size: 1.3em;
}

.seo-icon-warning {
    color: #ff9800;
    font-size: 1.3em;
}

.seo-icon-bad {
    color: #f44336;
    font-size: 1.3em;
}

.seo-suggestions {
    background: #fff3e0;
    padding: 15px 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.seo-suggestions h4 {
    margin-top: 0;
    color: #e65100;
}

.seo-suggestions ul {
    margin: 0;
    padding-left: 20px;
}

.seo-suggestions li {
    margin-bottom: 8px;
    color: #333;
}

.seo-error {
    background-color: #ffebee;
    color: #c62828;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #c62828;
    margin: 20px 0;
}

/* Mobile responsive */
@media screen and (max-width: 600px) {
    .seo-checker-form {
        flex-direction: column;
        align-items: stretch;
    }

    .seo-btn {
        width: 100%;
    }

    .seo-table th, .seo-table td {
        font-size: 14px;
        padding: 8px 4px;
    }

    .seo-status-cell {
        width: 30px;
    }
}