*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --yellow: #FFD000; --yellow-dark: #E6BB00;
  --black: #111111; --dark: #1A1A1A; --gray: #333333; --gray-light: #666666;
  --white: #FFFFFF; --bg-light: #F8F8F8; --border: #E5E5E5;
  --transition: 0.3s ease; --shadow: 0 4px 24px rgba(0,0,0,.10); --shadow-lg: 0 8px 40px rgba(0,0,0,.16);
}
html { scroll-behavior: smooth; }
body { font-family: "Inter", sans-serif; color: var(--dark); background: var(--white); overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--yellow); border-radius: 3px; }

/* NAV */
#navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: var(--black); border-bottom: 3px solid var(--yellow); transition: var(--transition); }
#navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.4); }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 72px; }
.nav-logo img { height: 48px; }
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a { color: var(--white); font-weight: 500; font-size: .88rem; padding: 8px 12px; border-radius: 6px; transition: var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--yellow); background: rgba(255,208,0,.1); }
.nav-cta { background: var(--yellow) !important; color: var(--black) !important; font-weight: 700 !important; }
.nav-cta:hover { background: var(--yellow-dark) !important; }

/* ── MEGA MENU ── */
.nav-products-wrap { position: relative; }
.nav-products-wrap > a { display: flex; align-items: center; gap: 5px; }
.nav-products-wrap > a::after { content: ' ▾'; font-size: 0.7rem; opacity: 0.7; transition: transform 0.2s; }
.nav-products-wrap:hover > a::after { transform: rotate(180deg); }

.nav-mega {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  background: #1a1a1a; border: 1px solid rgba(255,208,0,0.2); border-radius: 14px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5); display: flex;
  min-width: 700px; max-height: 480px;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  margin-top: 8px;
  z-index: 9999; overflow: hidden;
}
/* Gap köprüsü: menü ile link arasında transparan alan */
.nav-mega::before {
  content: "";
  position: absolute;
  top: -12px; left: 0; right: 0;
  height: 12px;
  background: transparent;
}
.nav-products-wrap:hover .nav-mega,
.nav-mega:hover {
  opacity: 1; visibility: visible; pointer-events: auto;
  
}

/* Sol: kategori listesi */
.nav-mega-cats {
  width: 220px; flex-shrink: 0;
  background: #111; border-right: 1px solid rgba(255,208,0,0.1);
  overflow-y: auto; padding: 8px 0;
}
.nav-mega-cat-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; cursor: pointer;
  color: #ccc; font-size: 0.82rem; font-weight: 500;
  transition: background 0.15s, color 0.15s;
  border-left: 3px solid transparent;
}
.nav-mega-cat-item:hover, .nav-mega-cat-item.active {
  background: rgba(255,208,0,0.08); color: #FFD000;
  border-left-color: #FFD000;
}
.nav-mega-cat-item i { width: 16px; text-align: center; font-size: 0.75rem; opacity: 0.7; flex-shrink: 0; }
.nav-mega-cat-item span { flex: 1; line-height: 1.3; }
.nav-mega-cat-count { font-size: 0.75rem; background: rgba(255,208,0,0.12); color: #FFD000; padding: 1px 6px; border-radius: 10px; flex-shrink: 0; }

/* Sağ: ürün önizleme */
.nav-mega-products {
  flex: 1; padding: 16px; overflow-y: auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px;
  align-content: start;
}
.nav-mega-product-card {
  background: #222; border: 1px solid rgba(255,255,255,0.06); border-radius: 8px;
  overflow: hidden; cursor: pointer; transition: border-color 0.15s, background 0.15s;
  text-decoration: none; color: inherit; display: block;
}
.nav-mega-product-card:hover { border-color: rgba(255,208,0,0.4); background: #2a2a2a; }
.nav-mega-product-img { width: 100%; height: 80px; object-fit: contain; padding: 8px; background: #1e1e1e; display: block; }
.nav-mega-product-img-placeholder { width: 100%; height: 80px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: rgba(255,208,0,0.3); background: #1e1e1e; }
.nav-mega-product-name { padding: 7px 8px 8px; font-size: 0.72rem; font-weight: 600; color: #ddd; line-height: 1.3; }
.nav-mega-empty { grid-column: 1/-1; text-align: center; padding: 40px 20px; color: rgba(255,255,255,0.3); font-size: 0.85rem; }
.nav-mega-see-all { grid-column: 1/-1; text-align: center; padding: 4px 0 6px; }
.nav-mega-see-all a { color: #FFD000; font-size: 0.78rem; font-weight: 700; text-decoration: none; }
.nav-mega-see-all a:hover { text-decoration: underline; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 26px; height: 2px; background: var(--white); border-radius: 2px; transition: var(--transition); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu { display: none; flex-direction: column; background: var(--black); border-top: 1px solid rgba(255,208,0,.2); padding: 12px 24px 20px; gap: 4px; }
.mobile-menu.open { display: flex; }
.mobile-menu a { color: var(--white); font-weight: 500; padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,.06); transition: var(--transition); }
.mobile-menu a:hover { color: var(--yellow); }

/* HERO */
#hero { min-height: 100vh; background: var(--black); display: flex; align-items: center; position: relative; overflow: hidden; padding-top: 72px; }

/* Hero Slideshow Arka Plan */
/* Hero Slideshow Arka Plan */
.hero-slideshow { position: absolute; inset: 0; width: 100%; height: 100%; background: var(--black); overflow: hidden; z-index: 0; }
.hero-slide { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; transition: opacity 1s ease-in-out; }
.hero-slide.active { opacity: 1; }
.hero-slide img, .hero-slide video { width: 100%; height: 100%; object-fit: cover; object-position: center; display: block; }
/* Karartma overlay — yazıların okunabilirliğini garantiler */
.hero-video-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 1;
  pointer-events: none;
}

.hero-bg-pattern { position: absolute; inset: 0; background-image: repeating-linear-gradient(45deg,transparent,transparent 40px,rgba(255,208,0,.03) 40px,rgba(255,208,0,.03) 80px); z-index: 2; }
.hero-accent { position: absolute; right: -100px; top: 50%; transform: translateY(-50%); width: 600px; height: 600px; background: radial-gradient(circle,rgba(255,208,0,.12) 0%,transparent 70%); pointer-events: none; z-index: 2; }
.hero-container { max-width: 1200px; margin: 0 auto; padding: 80px 24px; position: relative; z-index: 3; display: flex; flex-direction: column; align-items: center; text-align: center; }
.hero-badge { align-self: flex-start; display: inline-flex; align-items: center; justify-content: center; gap: 8px; background: rgba(255,208,0,.15); border: 1px solid rgba(255,208,0,.3); color: var(--yellow); font-size: .82rem; font-weight: 600; padding: 6px 14px; border-radius: 50px; margin-bottom: 28px; text-shadow: 0 4px 16px rgba(0,0,0,1), 0 2px 6px rgba(0,0,0,1), 0 0 10px rgba(0,0,0,0.8); }
.hero-title { font-size: clamp(2rem,4.5vw,3.8rem); font-weight: 900; color: var(--white); line-height: 1.1; margin-bottom: 24px; text-shadow: 0 4px 24px rgba(0,0,0,0.9), 0 2px 6px rgba(0,0,0,1); }
.hero-title span { color: var(--yellow); }
.hero-desc { font-size: clamp(1rem,2vw,1.15rem); color: #fff; max-width: 580px; line-height: 1.7; margin: 0 auto 40px auto; text-align: center; text-shadow: 0 4px 20px rgba(0,0,0,1), 0 2px 8px rgba(0,0,0,1), 0 0 10px rgba(0,0,0,0.9); font-weight: 500; }
.hero-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; justify-content: center; gap: 24px; margin-top: 64px; padding-top: 40px; border-top: 1px solid rgba(255,255,255,.08); flex-wrap: wrap; width: 100%; max-width: 1000px; }
.stat-number { font-size: 2rem; font-weight: 900; color: var(--yellow); text-shadow: 0 4px 20px rgba(0,0,0,1), 0 2px 8px rgba(0,0,0,1), 0 0 10px rgba(0,0,0,0.8); }
.stat-label { font-size: .82rem; color: #fff; margin-top: 4px; text-shadow: 0 4px 16px rgba(0,0,0,1), 0 2px 6px rgba(0,0,0,1), 0 0 8px rgba(0,0,0,0.9); font-weight: 600; }

/* PAGE HERO (alt sayfalar) */
.page-hero { background: var(--black); padding: 140px 0 80px; position: relative; overflow: hidden; }
.page-hero::after { content: ''; position: absolute; inset: 0; background-image: repeating-linear-gradient(45deg,transparent,transparent 40px,rgba(255,208,0,.03) 40px,rgba(255,208,0,.03) 80px); }
.page-hero .container { position: relative; z-index: 1; }
.page-hero-tag { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background: rgba(255,208,0,.15); border: 1px solid rgba(255,208,0,.3); color: var(--yellow); font-size: .8rem; font-weight: 600; padding: 5px 14px; border-radius: 50px; margin-bottom: 20px; }
.page-hero h1 { font-size: clamp(2rem,5vw,3.5rem); font-weight: 900; color: var(--white); margin-bottom: 16px; }
.page-hero p { font-size: 1.1rem; color: #aaa; max-width: 750px; line-height: 1.7; }

/* BUTTONS */
.btn-primary { display: inline-flex; align-items: center; gap: 10px; background: var(--yellow); color: var(--black); font-weight: 700; font-size: 1rem; padding: 16px 32px; border-radius: 8px; transition: var(--transition); border: 2px solid var(--yellow); }
.btn-primary:hover { background: var(--yellow-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,208,0,.3); }
.btn-outline { display: inline-flex; align-items: center; gap: 10px; background: transparent; color: var(--white); font-weight: 600; font-size: 1rem; padding: 16px 32px; border-radius: 8px; border: 2px solid rgba(255,255,255,.25); transition: var(--transition); }
.btn-outline:hover { border-color: var(--yellow); color: var(--yellow); transform: translateY(-2px); }
.btn-sm { padding: 10px 20px; font-size: .9rem; }

/* SECTION */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-light); }
.dark-section { background: var(--black); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-tag { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background: var(--yellow); color: var(--black); font-size: .78rem; font-weight: 700; padding: 4px 12px; border-radius: 4px; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.section-title { font-size: clamp(1.8rem,4vw,2.8rem); font-weight: 900; color: var(--dark); line-height: 1.2; margin-bottom: 16px; }
.section-title.light { color: var(--white); }
.section-desc { font-size: 1.05rem; color: var(--gray-light); max-width: 560px; line-height: 1.7; }
.section-desc.light { color: #aaa; }
.section-header { margin-bottom: 60px; }
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* SERVICE CARDS */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(300px,1fr)); gap: 24px; }
.service-card { background: var(--white); border: 1px solid var(--border); border-radius: 12px; padding: 36px 28px; transition: var(--transition); position: relative; overflow: hidden; }
.service-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--yellow); transform: scaleX(0); transition: var(--transition); }
.service-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--yellow); }
.service-card:hover::before { transform: scaleX(1); }
.service-card.featured { border-color: var(--yellow); border-width: 2px; }
.service-card.featured::before { transform: scaleX(1); }
.service-icon { width: 60px; height: 60px; background: var(--yellow); border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: var(--black); margin-bottom: 20px; }
.service-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.service-desc { font-size: .93rem; color: var(--gray-light); line-height: 1.7; }
.service-list { margin-top: 16px; display: flex; flex-direction: column; gap: 8px; }
.service-list li { font-size: .88rem; color: var(--gray-light); display: flex; align-items: center; gap: 8px; }
.service-list li::before { content: ''; width: 6px; height: 6px; background: var(--yellow); border-radius: 50%; flex-shrink: 0; }
.featured-badge { display: inline-block; background: var(--yellow); color: var(--black); font-size: .72rem; font-weight: 700; padding: 3px 10px; border-radius: 4px; text-transform: uppercase; letter-spacing: .5px; margin-bottom: 12px; }

/* PRODUCTS */
.products-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap: 20px; }
.product-card { background: #1E1E1E; border: 1px solid #2A2A2A; border-radius: 12px; overflow: hidden; transition: var(--transition); }
.product-card:hover { border-color: var(--yellow); transform: translateY(-4px); box-shadow: 0 12px 32px rgba(255,208,0,.15); }
.product-img { height: 180px; background: linear-gradient(135deg,#2A2A2A 0%,#333 100%); display: flex; align-items: center; justify-content: center; font-size: 3rem; position: relative; }
.product-img::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: var(--yellow); opacity: 0; transition: var(--transition); }
.product-card:hover .product-img::after { opacity: 1; }
.product-info { padding: 20px; }
.product-name { font-size: 1rem; font-weight: 700; color: var(--white); margin-bottom: 6px; }
.product-sub { font-size: .84rem; color: #777; }
.product-tag { display: inline-block; background: rgba(255,208,0,.15); color: var(--yellow); font-size: .75rem; font-weight: 600; padding: 3px 10px; border-radius: 4px; margin-top: 10px; }

/* ABOUT */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-visual-box { background: var(--black); border-radius: 16px; padding: 48px; position: relative; overflow: hidden; }
.about-visual-box::before { content: ''; position: absolute; top: -40px; right: -40px; width: 200px; height: 200px; background: radial-gradient(circle,rgba(255,208,0,.2) 0%,transparent 70%); }
.about-logo-display { text-align: center; position: relative; z-index: 1; }
.about-logo-display img { max-width: 280px; margin: 0 auto 24px; border-radius: 8px; }
.about-quote { color: #888; font-style: italic; font-size: .95rem; border-top: 1px solid #2A2A2A; padding-top: 20px; }
.about-badge { background: var(--yellow); color: var(--black); font-weight: 900; font-size: 1.1rem; padding: 16px 20px; border-radius: 12px; text-align: center; line-height: 1.3; display: inline-block; margin-top: 20px; }
.about-text { font-size: 1.05rem; color: var(--gray-light); line-height: 1.8; margin-bottom: 24px; }
.about-features { display: flex; flex-direction: column; gap: 16px; }
.about-feature { display: flex; gap: 16px; align-items: flex-start; }
.about-feature-icon { width: 40px; height: 40px; min-width: 40px; background: var(--yellow); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 1rem; color: var(--black); }
.about-feature-text h4 { font-size: .95rem; font-weight: 700; margin-bottom: 2px; }
.about-feature-text p { font-size: .87rem; color: var(--gray-light); }

/* TESIS */
.tesis-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.tesis-card { background: #1A1A1A; border: 1px solid #2A2A2A; border-radius: 16px; padding: 40px 32px; position: relative; overflow: hidden; }
.tesis-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--yellow); }
.tesis-number { font-size: 4rem; font-weight: 900; color: rgba(255,208,0,.1); position: absolute; top: 16px; right: 24px; line-height: 1; }
.tesis-icon { font-size: 2.5rem; margin-bottom: 20px; }
.tesis-title { font-size: 1.3rem; font-weight: 800; color: var(--white); margin-bottom: 12px; }
.tesis-desc { font-size: .93rem; color: #777; line-height: 1.7; margin-bottom: 16px; }
.tesis-addr { font-size: .85rem; color: #999; display: flex; align-items: flex-start; gap: 8px; }
.tesis-addr i { color: var(--yellow); margin-top: 2px; flex-shrink: 0; }

/* WHY */
.why-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(200px,1fr)); gap: 2px; }
.why-item { background: #161616; padding: 40px 28px; text-align: center; transition: var(--transition); position: relative; }
.why-item::after { content: ''; position: absolute; bottom: 0; left: 10%; right: 10%; height: 2px; background: var(--yellow); transform: scaleX(0); transition: var(--transition); }
.why-item:hover { background: #1E1E1E; }
.why-item:hover::after { transform: scaleX(1); }
.why-icon { font-size: 2.2rem; color: var(--yellow); margin-bottom: 16px; }
.why-title { font-size: 1rem; font-weight: 700; color: var(--white); margin-bottom: 8px; }
.why-desc { font-size: .87rem; color: #666; line-height: 1.6; }

/* QUICK CARDS (ana sayfa) */
.quick-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); gap: 20px; }
.quick-card { background: #1A1A1A; border: 1px solid #2A2A2A; border-radius: 14px; padding: 32px 24px; transition: var(--transition); display: flex; flex-direction: column; gap: 16px; }
.quick-card:hover { border-color: var(--yellow); transform: translateY(-4px); box-shadow: 0 12px 32px rgba(255,208,0,.15); }
.quick-card-icon { font-size: 2.2rem; }
.quick-card-title { font-size: 1.05rem; font-weight: 700; color: var(--white); }
.quick-card-desc { font-size: .88rem; color: #777; line-height: 1.6; flex: 1; }
.quick-card-link { display: inline-flex; align-items: center; gap: 6px; color: var(--yellow); font-size: .88rem; font-weight: 600; transition: var(--transition); }
.quick-card-link:hover { gap: 10px; }

/* CONTACT */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; align-items: start; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 28px; }
.contact-icon { width: 44px; height: 44px; min-width: 44px; background: var(--yellow); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1rem; color: var(--black); }
.contact-item h4 { font-size: .82rem; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; color: var(--gray-light); margin-bottom: 4px; }
.contact-item p, .contact-item a { font-size: .97rem; font-weight: 600; color: var(--dark); line-height: 1.5; }
.contact-item a:hover { color: var(--yellow-dark); }
.contact-form { background: var(--bg-light); border-radius: 16px; padding: 40px; border: 1px solid var(--border); }
.form-title { font-size: 1.3rem; font-weight: 700; margin-bottom: 28px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: .87rem; font-weight: 600; margin-bottom: 8px; color: var(--gray); }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 14px 16px; border: 1.5px solid var(--border); border-radius: 8px; font-family: inherit; font-size: .95rem; background: var(--white); color: var(--dark); transition: var(--transition); outline: none; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { border-color: var(--yellow); box-shadow: 0 0 0 3px rgba(255,208,0,.15); }
.form-group textarea { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.btn-form { width: 100%; background: var(--yellow); color: var(--black); border: none; padding: 16px; border-radius: 8px; font-size: 1rem; font-weight: 700; font-family: inherit; cursor: pointer; transition: var(--transition); display: flex; align-items: center; justify-content: center; gap: 10px; }
.btn-form:hover { background: var(--yellow-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,208,0,.3); }
.success-msg { display: none; background: #d4edda; color: #155724; border: 1px solid #c3e6cb; border-radius: 8px; padding: 14px 18px; margin-top: 16px; font-weight: 600; font-size: .95rem; text-align: center; }
.success-msg.show { display: block; }

/* MAP */
.map-wrap { border-radius: 16px; overflow: hidden; border: 2px solid #2A2A2A; margin-top: 40px; }
.map-wrap iframe { width: 100%; height: 320px; border: none; display: block; }

/* FOOTER */
footer { background: var(--black); border-top: 3px solid var(--yellow); padding: 60px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand img { height: 44px; margin-bottom: 16px; border-radius: 4px; }
.footer-brand p { font-size: .9rem; color: #777; line-height: 1.7; }
.footer-col h4 { color: var(--yellow); font-size: 1.05rem; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 20px; }
.footer-col ul { display: flex; flex-direction: column; gap: 14px; }
.footer-col ul li a { color: #888; font-size: 1.05rem; transition: var(--transition); }
.footer-col ul li a:hover { color: var(--yellow); padding-left: 4px; }
.footer-bottom { border-top: 1px solid #222; padding-top: 28px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: .85rem; color: #555; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 36px; height: 36px; background: #1E1E1E; border: 1px solid #333; border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #777; font-size: .9rem; transition: var(--transition); }
.footer-social a:hover { background: var(--yellow); color: var(--black); border-color: var(--yellow); }

/* FLOATING */
.whatsapp-float { position: fixed; bottom: 28px; right: 28px; z-index: 999; background:#25D366; color:#fff; width: 58px; height: 58px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; box-shadow: 0 4px 20px rgba(37,211,102,.4); transition: var(--transition); }
.whatsapp-float:hover { transform: scale(1.1); }
.wa-tooltip { position: absolute; right: 70px; background: var(--black); color: white; padding: 8px 14px; border-radius: 8px; font-size: .85rem; font-weight: 600; white-space: nowrap; opacity: 0; pointer-events: none; transition: var(--transition); }
.whatsapp-float:hover .wa-tooltip { opacity: 1; }
#scrollTop { position: fixed; bottom: 28px; right: 100px; z-index: 998; background: var(--yellow); color: var(--black); width: 44px; height: 44px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1rem; cursor: pointer; opacity: 0; pointer-events: none; transition: var(--transition); border: none; }
#scrollTop.visible { opacity: 1; pointer-events: auto; }
#scrollTop:hover { background: var(--yellow-dark); transform: translateY(-2px); }

/* ANIMATIONS */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity .6s ease, transform .6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up-delay-1 { transition-delay: .1s; }
.fade-up-delay-2 { transition-delay: .2s; }
.fade-up-delay-3 { transition-delay: .3s; }
.fade-up-delay-4 { transition-delay: .4s; }

/* RESPONSIVE */
@media (max-width:900px) { .about-grid,.tesis-grid,.contact-grid { grid-template-columns: 1fr; gap: 40px; } .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width:680px) { .nav-links { display: none; } .hamburger { display: flex; } .hero-stats { gap: 28px; } .form-row { grid-template-columns: 1fr; } .footer-grid { grid-template-columns: 1fr; } }
@media (max-width:480px) { .section { padding: 72px 0; } .contact-form { padding: 24px; } }
/* Language Switcher */
.lang-switch a { color: #888; text-decoration: none; transition: var(--transition); }
.lang-switch a:hover { color: var(--yellow); }
.lang-switch a.active-lang { color: var(--yellow); font-weight: 700; }
.site-popup-overlay { position: fixed; inset: 0; z-index: 99999; background: rgba(0,0,0,0.8); display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: all 0.3s; }
.site-popup-overlay.show { opacity: 1; visibility: visible; }
.site-popup-modal { background: transparent; text-align: center; max-width: 750px; width: 90%; position: relative; }
.popup-anim-fade { opacity: 0; transition: all 0.4s; } .site-popup-overlay.show .popup-anim-fade { opacity: 1; }
.popup-anim-fade-scale { opacity: 0; transform: scale(0.8); transition: all 0.4s; } .site-popup-overlay.show .popup-anim-fade-scale { opacity: 1; transform: scale(1); }
.popup-anim-slide { opacity: 0; transform: translateY(-50px); transition: all 0.4s; } .site-popup-overlay.show .popup-anim-slide { opacity: 1; transform: translateY(0); }
.site-popup-modal .popup-badge { background: #dc2626; color: white; border-radius: 50px; display: inline-block; padding: 8px 20px; font-size: 1.2rem; font-weight: bold; margin-bottom: 15px; }
.site-popup-modal .popup-title { color: white; font-size: 1.5rem; font-weight: 700; margin-bottom: 5px; }
.site-popup-modal .popup-desc { color: #ccc; font-size: 0.9rem; margin-bottom: 20px; }
.site-popup-modal .popup-img-wrap { display: inline-block; background: white; padding: 10px; border-radius: 10px; margin-bottom: 20px; }
.site-popup-modal .popup-img-wrap img { max-width: 100%; max-height: 75vh; object-fit: contain; margin: 0 auto; display: block; }
.site-popup-modal .popup-btn { background: #dc2626; color: white; border: none; padding: 10px 30px; border-radius: 5px; cursor: pointer; font-weight: bold; transition: 0.3s; }
.site-popup-modal .popup-btn:hover { background: #b91c1c; }

/* POPUP CSS */
.site-popup-overlay { position: fixed; inset: 0; z-index: 99999; background: rgba(0,0,0,0.8); display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: all 0.3s; }
.site-popup-overlay.show { opacity: 1; visibility: visible; }
.site-popup-modal { background: transparent; text-align: center; max-width: 750px; width: 90%; position: relative; }
.popup-anim-fade { opacity: 0; transition: all 0.4s; } .site-popup-overlay.show .popup-anim-fade { opacity: 1; }
.popup-anim-fade-scale { opacity: 0; transform: scale(0.8); transition: all 0.4s; } .site-popup-overlay.show .popup-anim-fade-scale { opacity: 1; transform: scale(1); }
.popup-anim-slide { opacity: 0; transform: translateY(-50px); transition: all 0.4s; } .site-popup-overlay.show .popup-anim-slide { opacity: 1; transform: translateY(0); }
.site-popup-modal .popup-badge { background: #dc2626; color: white; border-radius: 50px; display: inline-block; padding: 8px 20px; font-size: 1.2rem; font-weight: bold; margin-bottom: 15px; }
.site-popup-modal .popup-title { color: white; font-size: 1.5rem; font-weight: 700; margin-bottom: 5px; }
.site-popup-modal .popup-desc { color: #ccc; font-size: 0.9rem; margin-bottom: 20px; }
.site-popup-modal .popup-img-wrap { display: inline-block; background: white; padding: 10px; border-radius: 10px; margin-bottom: 20px; }
.site-popup-modal .popup-img-wrap img { max-width: 100%; max-height: 75vh; object-fit: contain; margin: 0 auto; display: block; }
.site-popup-modal .popup-btn { background: #dc2626; color: white; border: none; padding: 10px 30px; border-radius: 5px; cursor: pointer; font-weight: bold; transition: 0.3s; }
.site-popup-modal .popup-btn:hover { background: #b91c1c; }
/* Yüzen Popup Trigger */
.popup-trigger-float {
  position: fixed;
  bottom: 100px;
  right: 28px;
  width: 120px;
  height: 165px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  z-index: 998; /* just below popup overlay */
  cursor: pointer;
  overflow: hidden;
  border: 2px solid var(--yellow);
  transition: transform 0.3s;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--black);
}
.popup-trigger-float:hover {
  transform: scale(1.05) translateY(-5px);
}
.popup-trigger-float img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.popup-trigger-label {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background: var(--yellow);
  color: var(--black);
  font-size: 0.75rem;
  font-weight: 800;
  text-align: center;
  padding: 6px 2px;
  text-transform: uppercase;
  z-index: 2;
}
.mobile-menu.open { display: flex !important; max-height: calc(100vh - 80px); overflow-y: auto; }
.hamburger { -webkit-tap-highlight-color: transparent; touch-action: manipulation; position: relative; z-index: 1001; }

/* Mobil tasma duzeltmeleri */
html { overflow-x: hidden; max-width: 100%; }
img, video, iframe { max-width: 100%; }
.about-grid > *, .tesis-grid > *, .why-grid > *, .contact-grid > *, .footer-grid > * { min-width: 0; }
@media (max-width:680px) {
  #about-vision-mission-grid { grid-template-columns: 1fr !important; gap: 16px !important; }
  .why-grid { grid-template-columns: 1fr 1fr; }
  h1, h2, h3, p, a { overflow-wrap: anywhere; }
  .container { padding-left: 20px; padding-right: 20px; }
  .nav-container { padding: 0 16px; }
  .lang-switch { margin-right: 8px !important; }
}

/* Veri yuklenene kadar sayfayi gizle (eski/varsayilan icerik gorunmesin). 3 sn sonra guvenlik icin otomatik acilir. */
html:not(.data-ready) body { opacity: 0; animation: alumetReveal .3s ease 3s forwards; }
html.data-ready body { opacity: 1; transition: opacity .25s ease; }
@keyframes alumetReveal { to { opacity: 1; } }

/* Yukleme ekrani: beyaz yerine koyu zemin + kucuk animasyon */
html:not(.data-ready) { background: #0c0c0c; }
html:not(.data-ready)::before {
  content: ""; position: fixed; top: 50%; left: 50%; width: 42px; height: 42px; margin: -21px 0 0 -21px;
  border: 4px solid rgba(255,208,0,.25); border-top-color: #ffd000; border-radius: 50%;
  animation: alumetSpin .8s linear infinite; z-index: 99999;
}
@keyframes alumetSpin { to { transform: rotate(360deg); } }

/* Mobilde resmi belge kutusu ve yuzen butonlar kucuk olsun */
@media (max-width:680px) {
  .popup-trigger-float { width: 70px; height: 98px; right: 14px; bottom: 80px; border-radius: 6px; border-width: 2px; box-shadow: 0 3px 10px rgba(0,0,0,0.35); }
  .popup-trigger-float:hover { transform: none; }
  .popup-trigger-label { font-size: 0.5rem; padding: 3px 1px; letter-spacing: 0; }
  .whatsapp-float { width: 50px; height: 50px; font-size: 1.4rem; right: 14px; bottom: 16px; }
  #scrollTop { width: 38px; height: 38px; right: 74px; bottom: 20px; }
  .wa-tooltip { display: none; }
}