:root { 
    --primary-color: #1e3a8a; /* Kurumsal Lacivert */
    --secondary-color: #ea580c; /* Ateş Turuncusu (Enerji/Gaz) */
    --text-color: #334155; 
    --bg-light: #f8fafc; 
    --white: #ffffff; 
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.1); 
    --transition: all 0.3s ease-in-out; 
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { color: var(--text-color); background-color: var(--bg-light); line-height: 1.7; font-size: 16px; }
a { text-decoration: none; color: inherit; transition: var(--transition); }

/* Top Header */
.top-header { background: var(--primary-color); color: var(--white); padding: 12px 5%; display: flex; justify-content: space-between; font-size: 14px; }
.top-header a { color: #fed7aa; font-weight: bold; }

/* Main Header & Navbar */
.main-header { background: var(--white); padding: 20px 5%; display: flex; justify-content: space-between; align-items: center; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; }
.logo { font-size: 30px; font-weight: 900; color: var(--primary-color); letter-spacing: -1px; } 
.logo span { color: var(--secondary-color); }
.nav-links { list-style: none; display: flex; gap: 30px; align-items: center; }
.nav-links li a { font-weight: 700; font-size: 16px; color: var(--primary-color); text-transform: uppercase; } 
.nav-links li a:hover { color: var(--secondary-color); }

/* Dropdown Menü */
.dropdown { position: relative; }
.dropdown-menu { position: absolute; top: 100%; left: 0; background: var(--white); min-width: 250px; box-shadow: 0 15px 30px rgba(0,0,0,0.1); border-radius: 8px; opacity: 0; visibility: hidden; transform: translateY(15px); transition: var(--transition); list-style: none; padding: 10px 0; z-index: 1001; border-top: 4px solid var(--secondary-color); }
.dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu li { border-bottom: 1px solid #f1f5f9; } 
.dropdown-menu li a { display: block; padding: 15px 20px; color: var(--primary-color); font-weight: 600; text-transform: none; } 
.dropdown-menu li a:hover { background: #fff7ed; color: var(--secondary-color); padding-left: 25px; }

/* Hero Slider */
.hero-slider { background: linear-gradient(135deg, rgba(30, 58, 138, 0.9), rgba(15, 23, 42, 0.9)), url('tup-bg.jpg') center/cover; color: var(--white); text-align: center; padding: 130px 5%; display: flex; align-items: center; justify-content: center; min-height: 65vh; border-bottom: 6px solid var(--secondary-color); }
.slider-content { max-width: 800px; margin: 0 auto; } 
.hero-slider h1 { font-size: 56px; font-weight: 900; margin-bottom: 20px; line-height: 1.1; } 
.hero-slider p { font-size: 22px; margin-bottom: 40px; font-weight: 300; color: #cbd5e1; }
.btn-primary { background: var(--secondary-color); color: var(--white); padding: 16px 40px; font-weight: 800; border-radius: 8px; box-shadow: 0 10px 20px rgba(234, 88, 12, 0.3); display: inline-block; font-size: 18px; } 
.btn-primary:hover { background: #c2410c; transform: translateY(-3px); }

/* Bölüm Başlıkları ve Kutular */
.section-title { font-size: 38px; color: var(--primary-color); margin-bottom: 50px; text-align:center; font-weight: 900; }
.why-us-section { background: var(--bg-light); padding: 100px 5%; }
.why-us-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 40px; }
.why-box { background: var(--white); padding: 40px; border-radius: 12px; box-shadow: var(--shadow); border-top: 5px solid var(--secondary-color); transition: var(--transition); } 
.why-box:hover { transform: translateY(-10px); }
.why-box h3 { color: var(--primary-color); margin-bottom: 15px; font-size: 24px; font-weight: 800; }

/* Hizmetler Grid */
.services-section { padding: 100px 5%; background: var(--white); }
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 40px; }
.service-card { background: var(--bg-light); padding: 50px 30px; border-radius: 16px; box-shadow: var(--shadow); text-align: center; border: 1px solid #e2e8f0; transition: var(--transition); display: block; } 
.service-card:hover { transform: translateY(-10px); background: var(--white); border-color: var(--secondary-color); box-shadow: 0 20px 40px rgba(234, 88, 12, 0.15); }
.icon-3d { width: 90px; height: 90px; background: linear-gradient(135deg, var(--secondary-color), #c2410c); border-radius: 50%; margin: 0 auto 25px; display: flex; align-items: center; justify-content: center; color: var(--white); font-size: 36px; box-shadow: 0 10px 20px rgba(234, 88, 12, 0.3); }

/* CTA Banner & Footer */
.cta-banner { background: linear-gradient(135deg, var(--primary-color), #0f172a); color: var(--white); padding: 70px 5%; text-align: center; margin: 60px 0; border-radius: 16px; box-shadow: var(--shadow); border-bottom: 5px solid var(--secondary-color); } 
.cta-banner h2 { font-size: 38px; margin-bottom: 20px; font-weight: 900; } 
.cta-btn { background: var(--secondary-color); color: var(--white); padding: 18px 45px; font-weight: bold; border-radius: 8px; display: inline-block; font-size: 20px; box-shadow: 0 10px 20px rgba(234, 88, 12, 0.4); } 
.cta-btn:hover { background: var(--white); color: var(--primary-color); }

.main-footer { background: var(--primary-color); color: #cbd5e1; padding: 80px 5% 20px; margin-top: 60px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 50px; margin-bottom: 50px; } 
.footer-col h3 { color: var(--white); margin-bottom: 25px; font-size: 24px; font-weight: 800; border-bottom: 2px solid var(--secondary-color); padding-bottom: 10px; display: inline-block; } 
.footer-col ul { list-style: none; } 
.footer-col ul li { margin-bottom: 15px; } 
.footer-col ul li a:hover { color: var(--secondary-color); padding-left: 8px; }
.footer-bottom { text-align: center; border-top: 1px solid #334155; padding-top: 25px; font-size: 15px; }

/* Sabit Butonlar */
.floating-btn { position: fixed; bottom: 30px; right: 30px; background: var(--secondary-color); color: var(--white); width: 65px; height: 65px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 28px; box-shadow: 0 10px 25px rgba(234, 88, 12, 0.5); z-index: 1000; transition: var(--transition); }
.floating-btn:hover { transform: scale(1.1) translateY(-5px); background: var(--primary-color); }
.whatsapp-btn { position: fixed; bottom: 30px; left: 30px; background: #25D366; color: var(--white); width: 65px; height: 65px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 34px; box-shadow: 0 10px 25px rgba(37, 211, 102, 0.4); z-index: 1000; transition: var(--transition); text-decoration: none; }
.whatsapp-btn:hover { transform: scale(1.1) translateY(-5px); background: #128C7E; }

/* Alt Sayfalar İçin Düzenlemeler */
.page-header { background: linear-gradient(135deg, var(--primary-color), #0f172a); color: var(--white); padding: 80px 5%; text-align: center; border-bottom: 6px solid var(--secondary-color); }
.page-header h1 { font-size: 46px; margin-bottom: 15px; font-weight: 900; }
.content-section { padding: 80px 5%; max-width: 1100px; margin: 0 auto; } 
.content-text { font-size: 18px; color: #475569; margin-bottom: 25px; line-height: 1.8; text-align: justify; }
.content-text strong { color: var(--primary-color); font-weight: 700; }

/* Formlar ve Harita (İletişim Sayfası) */
.contact-container { display: flex; flex-wrap: wrap; gap: 50px; } 
.contact-form { flex: 1; min-width: 320px; background: var(--white); padding: 40px; border-radius: 16px; box-shadow: var(--shadow); border: 1px solid #e2e8f0; }
.contact-form input, .contact-form textarea { width: 100%; padding: 18px; margin-bottom: 25px; border: 1px solid #cbd5e1; border-radius: 8px; font-size: 16px; background: #f8fafc; transition: var(--transition); } 
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--secondary-color); background: var(--white); box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.2); }
.contact-form button { background: var(--secondary-color); color: var(--white); border: none; padding: 20px 30px; font-weight: 800; border-radius: 8px; cursor: pointer; width: 100%; font-size: 20px; transition: var(--transition); }
.contact-form button:hover { background: var(--primary-color); transform: translateY(-3px); box-shadow: 0 10px 20px rgba(30, 58, 138, 0.3); }
.contact-info-box { flex: 1; min-width: 320px; } 
.map-responsive { overflow: hidden; padding-bottom: 60%; position: relative; height: 0; border-radius: 16px; box-shadow: var(--shadow); } 
.map-responsive iframe { left: 0; top: 0; height: 100%; width: 100%; position: absolute; border: 0; }