/* RESET & VARIABLES */
:root {
    --primary: #0f172a;
    --secondary: #3b82f6;
    --accent: #10b981;
    --whatsapp: #25d366;
    --bg-light: #f8fafc;
    --text-main: #334155;
    --text-light: #64748b;
    --white: #ffffff;
    --transition: all 0.3s ease-in-out;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', system-ui, sans-serif; }
html { scroll-behavior: smooth; }
body { color: var(--text-main); background-color: var(--white); line-height: 1.6; }

/* UTILITIES */
.container { width: 90%; max-width: 1200px; margin: 0 auto; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.grid-2-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.grid-3-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.padding-block { padding: 80px 0; }
.text-center { text-align: center; }
.bg-light { background-color: var(--bg-light); }
.mt-4 { margin-top: 40px; }
.align-items-center { align-items: center; }

/* LINKS & BUTTONS */
a { text-decoration: none; color: inherit; transition: var(--transition); }
.seo-link { color: var(--secondary); font-weight: 600; text-decoration: underline; }
.seo-link:hover { color: var(--accent); }

.btn-primary, .btn-secondary, .btn-whatsapp, .btn-whatsapp-large {
    display: inline-block; padding: 12px 24px; border-radius: 8px; font-weight: bold; cursor: pointer; transition: var(--transition);
}
.btn-primary { background: var(--secondary); color: var(--white); }
.btn-primary:hover { background: #2563eb; }
.btn-secondary { background: rgba(255,255,255,0.2); color: var(--white); border: 1px solid var(--white); backdrop-filter: blur(10px); }
.btn-secondary:hover { background: var(--white); color: var(--primary); }
.btn-whatsapp { background: var(--whatsapp); color: var(--white); box-shadow: 0 4px 15px rgba(37,211,102,0.3); }
.btn-whatsapp-large { background: var(--whatsapp); color: var(--white); padding: 16px 32px; font-size: 1.1rem; border-radius: 50px; }
.btn-whatsapp:hover, .btn-whatsapp-large:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(37,211,102,0.4); }

/* HEADER & NAV */
.top-bar { background: var(--primary); color: var(--white); padding: 8px 0; font-size: 0.9rem; }
.language-selector select { background: var(--white); color: var(--primary); border:none; padding:4px 8px; border-radius: 4px; margin-left:10px; cursor:pointer;}
.navbar { padding: 20px 0; position: sticky; top: 0; background: rgba(255,255,255,0.95); z-index: 1000; backdrop-filter: blur(10px); box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
.logo a { font-size: 1.8rem; font-weight: 900; color: var(--primary); }
.logo span { color: var(--secondary); }
.nav-links { list-style: none; display: flex; gap: 30px; align-items: center; }
.nav-links a { font-weight: 500; color: var(--primary); }
.nav-links a:hover { color: var(--secondary); }
.hamburger { display: none; cursor: pointer; flex-direction: column; gap: 5px; }
.hamburger span { width: 25px; height: 3px; background: var(--primary); border-radius: 3px; }

/* HERO SECTION */
.hero-section { position: relative; min-height: 80vh; background: url('images/a (1).webp') center/cover no-repeat; display: flex; align-items: center; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(to right, rgba(15,23,42,0.9), rgba(15,23,42,0.6)); }
.hero-content { position: relative; z-index: 10; color: var(--white); max-width: 800px; }
.hero-content h1 { font-size: 3.5rem; line-height: 1.2; margin-bottom: 20px; }
.hero-content p { font-size: 1.2rem; margin-bottom: 30px; opacity: 0.9; }
.hero-buttons { display: flex; gap: 15px; }

/* SECTIONS & TYPOGRAPHY */
.section-header { margin-bottom: 50px; }
.section-header h2 { font-size: 2.5rem; color: var(--primary); margin-bottom: 15px; }
.section-header p { font-size: 1.1rem; color: var(--text-light); max-width: 600px; margin: 0 auto; }
.about-text h2 { font-size: 2.2rem; color: var(--primary); margin-bottom: 20px; }
.about-text p, .system-details p { margin-bottom: 15px; font-size: 1.05rem; }
.feature-list { list-style: none; margin-top: 20px; }
.feature-list li { margin-bottom: 10px; padding-left: 30px; position: relative; font-weight: 500; }
.feature-list li::before { content: '✓'; position: absolute; left: 0; color: var(--accent); font-weight: bold; }

/* IMAGES & CARDS */
.image-wrapper img, .band-img { width: 100%; border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); object-fit: cover; }
.image-wrapper { position: relative; overflow: hidden; border-radius: 12px; }
.image-wrapper::after { content: ''; position: absolute; inset: 0; box-shadow: inset 0 0 20px rgba(0,0,0,0.1); pointer-events: none; }
.gallery-band img { width: 100%; height: 300px; object-fit: cover; border-radius: 12px; transition: var(--transition); }
.gallery-band img:hover { transform: scale(1.03); }

.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; margin-top: 40px; }
.card { background: var(--white); padding: 30px; border-radius: 12px; box-shadow: 0 5px 20px rgba(0,0,0,0.05); transition: var(--transition); border-top: 4px solid var(--secondary); }
.card:hover { transform: translateY(-5px); box-shadow: 0 10px 25px rgba(0,0,0,0.1); }
.card h4 { color: var(--primary); margin-bottom: 15px; font-size: 1.2rem; }

/* MERAK EDİLENLER GRID */
.points-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 25px; }
.point-item { background: var(--white); padding: 25px; border-radius: 8px; border-left: 4px solid var(--accent); box-shadow: 0 4px 15px rgba(0,0,0,0.03); }
.point-item h3 { font-size: 1.1rem; margin-bottom: 10px; color: var(--primary); }
.point-item p { font-size: 0.95rem; color: var(--text-light); }

/* CTA BANNERS */
.cta-banner { background: var(--primary); color: var(--white); padding: 60px 0; border-radius: 12px; margin: 40px auto; width: 95%; max-width: 1300px; }
.cta-banner h3 { font-size: 2rem; margin-bottom: 10px; }
.alternate-cta { background: linear-gradient(135deg, var(--secondary), #1e40af); }

/* ACCORDION (FAQ) */
.accordion-container { max-width: 800px; margin: 0 auto; }
.accordion-item { background: var(--white); margin-bottom: 15px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.05); overflow: hidden; }
.accordion-header { width: 100%; padding: 20px; text-align: left; background: none; border: none; font-size: 1.1rem; font-weight: 600; color: var(--primary); cursor: pointer; display: flex; justify-content: space-between; align-items: center; transition: var(--transition); }
.accordion-header:hover { background: var(--bg-light); }
.accordion-header::after { content: '+'; font-size: 1.5rem; transition: var(--transition); }
.accordion-header.active::after { content: '−'; transform: rotate(180deg); }
.accordion-content { padding: 0 20px; max-height: 0; overflow: hidden; transition: max-height 0.4s ease-out; background: var(--white); }
.accordion-content p { padding-bottom: 20px; color: var(--text-light); }

/* FOOTER */
.main-footer { background: #020617; color: #cbd5e1; padding: 60px 0 20px; }
.footer-info h3 { color: var(--white); font-size: 1.5rem; margin-bottom: 15px; }
.contact-list { list-style: none; margin-top: 20px; }
.contact-list li { margin-bottom: 10px; }
.footer-cta h4 { color: var(--white); font-size: 1.3rem; margin-bottom: 10px; }
.footer-cta p { margin-bottom: 20px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 40px; padding-top: 20px; font-size: 0.9rem; }

/* ANIMATIONS (Reveal on Scroll) */
.reveal { opacity: 0; transform: translateY(50px); transition: all 0.8s ease-out; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* RESPONSIVE DESIGN */
@media (max-width: 992px) {
    .grid-2-cols { grid-template-columns: 1fr; }
    .reverse-mobile { flex-direction: column-reverse; display: flex; }
    .hero-content h1 { font-size: 2.8rem; }
    .cta-content { flex-direction: column; text-align: center; gap: 20px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; position: absolute; top: 100%; left: 0; width: 100%; background: var(--white); flex-direction: column; padding: 20px; box-shadow: 0 10px 10px rgba(0,0,0,0.1); }
    .nav-links.active { display: flex; }
    .hamburger { display: flex; }
    .top-bar .flex-between { flex-direction: column; gap: 10px; }
    .footer-content { flex-direction: column; gap: 40px; text-align: center; }
    .footer-bottom .flex-between { flex-direction: column; gap: 15px; }
}