Basit Hazır Site Promptu (Tek Sayfalık)

Create a one-page landing website as a single index.php file that can run directly on a standard shared hosting environment (PHP 7.4+). All HTML, CSS, JavaScript, and PHP must be contained in this single file. Do not use frameworks, CDNs, or external files. The website language must be Turkish. Use the following company information directly in the content: Şirket Adı: #sirket_adi. Sektör: #sektor. Hizmetler: #hizmetler. İletişim: Telefon #iletisim_telefonu, E-posta #e_posta. WhatsApp Numarası: #whatsapp_numarasi. Renk Tercihi: Koyu mavi ana renk, açık arka plan tonları, WhatsApp yeşili vurgulu. The page should have a soft modern visual style and a professional corporate tone. Structure the page clearly with a hero section at the top that includes a main headline, a short descriptive text, and a call-to-action button. Below the hero, include a short introduction/about section explaining the company and its experience. Add a services section where each service is presented clearly and simply. Include a section explaining why customers should choose the company. Add a strong call-to-action section encouraging users to contact via WhatsApp. Finish the page with a footer that includes company name and contact information. Add a fixed floating WhatsApp button at the bottom-right corner of the screen on all devices. The button must open https://wa.me/#whatsapp_numarasi when clicked. Use simple hover animation for the button. Ensure the layout is responsive and works on mobile and desktop. Output a complete, working index.php file.