:root {
  --bg: #05090c; --bg-soft: #0a1218; --bg-card: #0e1a22;
  --border: rgba(255,255,255,0.08); --border-str: rgba(255,255,255,0.14);
  --text: #e7eef3; --text-dim: #8ea0ae; --text-muted: #5c6b76;
  --accent: #0D90C1; --accent-2: #0A4A69; --accent-glow: #22b3e6;
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --container: 1320px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body); background: var(--bg); color: var(--text);
  line-height: 1.6; overflow-x: hidden; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.skip-link { position: absolute; left: -9999px; top: 1rem; z-index: 9999; background: var(--accent); color: white; padding: 8px 16px; border-radius: 4px; font-weight: 600; }
.skip-link:focus { left: 1rem; }
:focus-visible { outline: 2px solid var(--accent-glow); outline-offset: 3px; border-radius: 2px; }

/* Background layers */
.bg-grid { position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image: linear-gradient(rgba(255,255,255,0.022) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 40%, transparent 85%);
}
main, header, footer { position: relative; z-index: 2; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 32px; }

/* Header */
header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); background: rgba(5,9,12,0.7); border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 12px; font-family: var(--font-display); font-size: 22px; font-weight: 500; letter-spacing: -0.02em; }
.logo-mark { width: 34px; height: 34px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); display: grid; place-items: center; font-family: var(--font-mono); font-size: 14px; font-weight: 600; color: white; box-shadow: 0 0 24px rgba(13,144,193,0.35); }
.logo em { font-style: italic; color: var(--accent-glow); }
.nav-links { display: flex; gap: 28px; list-style: none; font-size: 14px; font-weight: 500; }
.nav-links a { color: var(--text-dim); transition: color 0.2s; position: relative; }
.nav-links a:hover { color: var(--text); }
.nav-links a::after { content: ''; position: absolute; bottom: -6px; left: 0; width: 0; height: 1px; background: var(--accent-glow); transition: width 0.3s; }
.nav-links a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 20px; }
.lang-switch { display: flex; border: 1px solid var(--border-str); border-radius: 999px; padding: 3px; font-family: var(--font-mono); font-size: 11px; }
.lang-switch button { background: transparent; border: none; color: var(--text-muted); padding: 6px 12px; border-radius: 999px; cursor: pointer; transition: all 0.2s; }
.lang-switch button.active { background: var(--text); color: var(--bg); }
.cta-btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; background: var(--text); color: var(--bg); border-radius: 999px; font-size: 13px; font-weight: 600; transition: all 0.25s; border: none; cursor: pointer; }
.cta-btn:hover { background: var(--accent-glow); transform: translateY(-1px); }
.cta-btn svg { width: 14px; height: 14px; }

/* HERO with image */
.hero { padding: 140px 0 120px; position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 80px; align-items: center; }
.hero-content { position: relative; z-index: 2; }

.hero-label { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 32px; padding: 6px 14px; border: 1px solid var(--border-str); border-radius: 999px; }
.hero-label .pulse { width: 6px; height: 6px; background: #10e072; border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(16,224,114,0.6); } 70% { box-shadow: 0 0 0 10px rgba(16,224,114,0); } 100% { box-shadow: 0 0 0 0 rgba(16,224,114,0); } }

.hero h1 { font-family: var(--font-display); font-size: clamp(40px, 5.5vw, 78px); line-height: 0.98; letter-spacing: -0.035em; font-weight: 400; margin-bottom: 28px; }
.hero h1 em { font-style: italic; font-weight: 300; background: linear-gradient(180deg, var(--accent-glow), var(--accent)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero h1 .block { display: block; }
.hero-sub { font-size: 18px; color: var(--text-dim); margin-bottom: 40px; line-height: 1.55; max-width: 560px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 64px; }

.hero-visual { position: relative; aspect-ratio: 4/5; border-radius: 8px; overflow: hidden; border: 1px solid var(--border-str); box-shadow: 0 30px 80px rgba(0,0,0,0.6), 0 0 60px rgba(13,144,193,0.15); }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; }
.hero-visual::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(5,9,12,0) 50%, rgba(5,9,12,0.85) 100%), linear-gradient(135deg, rgba(13,144,193,0.18), transparent 60%); pointer-events: none; }
.hero-visual-overlay { position: absolute; bottom: 24px; left: 24px; right: 24px; z-index: 2; display: flex; justify-content: space-between; align-items: end; gap: 16px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim); }
.hero-visual-overlay .coords { padding: 6px 10px; background: rgba(5,9,12,0.7); backdrop-filter: blur(8px); border: 1px solid var(--border-str); border-radius: 4px; }
.hero-visual-overlay .coords strong { color: var(--accent-glow); font-weight: 500; }

.btn { display: inline-flex; align-items: center; gap: 10px; padding: 16px 28px; border-radius: 999px; font-size: 14px; font-weight: 600; transition: all 0.25s; cursor: pointer; border: 1px solid transparent; }
.btn-primary { background: var(--accent); color: white; box-shadow: 0 8px 32px rgba(13,144,193,0.35); }
.btn-primary:hover { background: var(--accent-glow); transform: translateY(-2px); }
.btn-ghost { border-color: var(--border-str); color: var(--text); }
.btn-ghost:hover { border-color: var(--text); background: rgba(255,255,255,0.03); }
.btn svg { width: 16px; height: 16px; }

.hero-metrics { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--border); padding-top: 32px; max-width: 720px; }
.metric { padding-right: 24px; border-right: 1px solid var(--border); }
.metric:last-child { border-right: none; }
.metric-num { font-family: var(--font-display); font-size: 42px; font-weight: 400; letter-spacing: -0.03em; line-height: 1; margin-bottom: 6px; display: flex; align-items: baseline; gap: 2px; }
.metric-num .plus { color: var(--accent-glow); font-size: 26px; }
.metric-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); line-height: 1.3; }

/* Sections */
section { padding: 120px 0; position: relative; }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 64px; gap: 48px; flex-wrap: wrap; }
.section-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent-glow); margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.section-label::before { content: ''; width: 24px; height: 1px; background: var(--accent-glow); }
.section-title { font-family: var(--font-display); font-size: clamp(36px, 5vw, 60px); font-weight: 400; letter-spacing: -0.03em; line-height: 1.05; max-width: 760px; }
.section-title em { font-style: italic; color: var(--text-dim); font-weight: 300; }
.section-desc { font-size: 16px; color: var(--text-dim); max-width: 400px; line-height: 1.6; }

/* SECTION BANNER (large strip image between sections) */
.section-banner { position: relative; height: 320px; overflow: hidden; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-banner img { width: 100%; height: 100%; object-fit: cover; opacity: 0.5; transform: scale(1.05); transition: transform 8s ease, opacity 0.6s ease; }
.section-banner:hover img { transform: scale(1.0); opacity: 0.7; }
.section-banner::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, var(--bg) 0%, rgba(5,9,12,0.4) 50%, var(--bg) 100%); pointer-events: none; }
.banner-content { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 16px; text-align: center; padding: 24px; z-index: 2; }
.banner-content .label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.25em; text-transform: uppercase; color: var(--accent-glow); }
.banner-content h3 { font-family: var(--font-display); font-size: clamp(28px, 4vw, 48px); font-weight: 400; letter-spacing: -0.03em; line-height: 1.1; max-width: 800px; }
.banner-content h3 em { font-style: italic; color: var(--text-dim); }

/* SERVICE CARDS WITH IMAGES (used for both CBS & BT) */
.svc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.svc-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; transition: all 0.4s ease; display: flex; flex-direction: column; cursor: pointer; }
.svc-card:hover { transform: translateY(-4px); border-color: var(--border-str); box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 30px rgba(13,144,193,0.1); }
.svc-card:hover .svc-img img { transform: scale(1.08); }
.svc-card:hover .svc-arrow { color: var(--accent-glow); transform: translate(4px, -4px); }

.svc-img { aspect-ratio: 16/10; overflow: hidden; position: relative; background: var(--bg-soft); }
.svc-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; opacity: 0.85; }
.svc-img::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 50%, rgba(14,26,34,0.7) 100%), linear-gradient(135deg, rgba(13,144,193,0.15), transparent); pointer-events: none; }
.svc-img-tag { position: absolute; top: 16px; left: 16px; z-index: 2; padding: 5px 11px; background: rgba(5,9,12,0.75); backdrop-filter: blur(8px); border: 1px solid var(--border-str); border-radius: 999px; font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent-glow); }

.svc-body { padding: 28px; flex: 1; display: flex; flex-direction: column; }
.svc-head-row { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 16px; }
.svc-num { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); letter-spacing: 0.1em; }
.svc-arrow { color: var(--text-muted); transition: all 0.3s; }

.svc-card h3 { font-family: var(--font-display); font-size: 24px; font-weight: 400; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 12px; }
.svc-card p { color: var(--text-dim); font-size: 14px; line-height: 1.6; margin-bottom: 20px; flex: 1; }
.svc-stack { display: flex; flex-wrap: wrap; gap: 6px; padding-top: 16px; border-top: 1px solid var(--border); }
.svc-stack span { font-family: var(--font-mono); font-size: 10px; color: var(--text-muted); padding: 3px 8px; background: rgba(255,255,255,0.03); border-radius: 4px; }

/* CBS section subtle accent */
.geo-section { background: radial-gradient(ellipse at 50% 0%, rgba(13,144,193,0.06), transparent 60%); }
.it-section { background: radial-gradient(ellipse at 50% 0%, rgba(10,74,105,0.08), transparent 60%); }

/* About */
.about-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-img { position: relative; aspect-ratio: 4/5; border-radius: 12px; overflow: hidden; border: 1px solid var(--border-str); box-shadow: 0 20px 60px rgba(0,0,0,0.5); }
.about-img img { width: 100%; height: 100%; object-fit: cover; }
.about-img::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(5,9,12,0.1) 0%, rgba(5,9,12,0.7) 100%); pointer-events: none; }
.about-img-stamp { position: absolute; bottom: 24px; left: 24px; right: 24px; z-index: 2; padding: 18px; border: 1px solid var(--border-str); background: rgba(5,9,12,0.72); backdrop-filter: blur(12px); border-radius: 8px; }
.about-img-stamp .yr { font-family: var(--font-display); font-size: 36px; font-weight: 400; letter-spacing: -0.02em; line-height: 1; color: var(--accent-glow); margin-bottom: 4px; }
.about-img-stamp .lbl { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-dim); }

.about-text h2 { font-family: var(--font-display); font-size: clamp(36px, 4.5vw, 56px); font-weight: 400; letter-spacing: -0.03em; line-height: 1.05; margin-bottom: 32px; }
.about-text h2 em { font-style: italic; color: var(--accent-glow); }
.about-text p { color: var(--text-dim); font-size: 17px; line-height: 1.7; margin-bottom: 20px; }
.about-points { list-style: none; margin-top: 32px; display: grid; gap: 16px; }
.about-points li { display: flex; gap: 16px; padding: 16px 0; border-top: 1px solid var(--border); }
.about-points li:last-child { border-bottom: 1px solid var(--border); }
.about-points .dot { width: 6px; height: 6px; background: var(--accent-glow); border-radius: 50%; margin-top: 10px; flex-shrink: 0; }
.about-points strong { font-weight: 500; display: block; margin-bottom: 4px; }
.about-points span { color: var(--text-dim); font-size: 14px; }

/* Process */
.process-list { display: grid; margin-top: 48px; list-style: none; padding: 0; }
.process-item { display: grid; grid-template-columns: 80px 1fr 2fr 160px; gap: 40px; padding: 36px 0; border-top: 1px solid var(--border); align-items: center; transition: background 0.3s; }
.process-item:last-child { border-bottom: 1px solid var(--border); }
.process-item:hover { background: linear-gradient(90deg, transparent, var(--bg-soft) 50%, transparent); }
.process-num { font-family: var(--font-mono); font-size: 13px; color: var(--text-muted); letter-spacing: 0.1em; }
.process-title { font-family: var(--font-display); font-size: 28px; font-weight: 400; letter-spacing: -0.02em; margin: 0; }
.process-desc { color: var(--text-dim); font-size: 15px; line-height: 1.55; margin: 0; }
.process-tag { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent-glow); text-align: right; }

/* FAQ */
.faq-list { margin-top: 48px; }
.faq-item { border-top: 1px solid var(--border); padding: 28px 0; }
.faq-item:last-child { border-bottom: 1px solid var(--border); }
.faq-q { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; cursor: pointer; width: 100%; background: transparent; border: none; color: var(--text); text-align: left; font-family: var(--font-display); font-size: 22px; font-weight: 400; letter-spacing: -0.01em; padding: 0; }
.faq-q::after { content: '+'; font-family: var(--font-mono); font-size: 24px; color: var(--accent-glow); font-weight: 300; transition: transform 0.3s; flex-shrink: 0; }
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease; color: var(--text-dim); font-size: 15px; line-height: 1.7; padding-right: 48px; }
.faq-item.open .faq-a { max-height: 500px; padding-top: 16px; }

/* References */
.ref-marquee-wrap { overflow: hidden; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 36px 0; margin-top: 48px; mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent); }
.ref-marquee { display: flex; gap: 80px; animation: scroll 40s linear infinite; width: max-content; }
@keyframes scroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
.ref-item { font-family: var(--font-display); font-size: 26px; color: var(--text-muted); letter-spacing: -0.02em; white-space: nowrap; transition: color 0.3s; display: flex; align-items: center; gap: 80px; }
.ref-item::after { content: '◆'; font-size: 8px; color: var(--accent-glow); }
.ref-item:hover { color: var(--text); }

.ref-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); margin-top: 48px; list-style: none; padding: 0; border-radius: 4px; overflow: hidden; }
.ref-cell { background: var(--bg); padding: 36px 20px; text-align: center; font-family: var(--font-mono); font-size: 12px; color: var(--text-dim); min-height: 110px; display: flex; align-items: center; justify-content: center; line-height: 1.4; transition: all 0.3s; }
.ref-cell:hover { background: var(--bg-card); color: var(--text); }

/* CTA */
.cta-block { position: relative; border-radius: 12px; padding: 80px 64px; overflow: hidden; text-align: center; min-height: 420px; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.cta-bg { position: absolute; inset: 0; z-index: 0; }
.cta-bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.35; }
.cta-bg::after { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at center, rgba(5,9,12,0.5) 0%, rgba(5,9,12,0.92) 100%); }
.cta-block > * { position: relative; z-index: 1; }
.cta-block h2 { font-family: var(--font-display); font-size: clamp(36px, 5vw, 64px); font-weight: 400; letter-spacing: -0.035em; line-height: 1.02; margin-bottom: 24px; }
.cta-block h2 em { font-style: italic; color: var(--accent-glow); }
.cta-block p { color: var(--text-dim); font-size: 18px; max-width: 540px; margin: 0 auto 40px; line-height: 1.55; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 80px; margin-top: 64px; }
.contact-info dl { display: grid; }
.contact-info dt { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-muted); padding-top: 24px; padding-bottom: 8px; border-top: 1px solid var(--border); }
.contact-info dd { font-size: 22px; font-weight: 300; font-family: var(--font-display); padding-bottom: 24px; }
.contact-info dd a:hover { color: var(--accent-glow); }
.contact-info dd:last-child { border-bottom: 1px solid var(--border); }

.contact-form { display: grid; gap: 20px; }
.form-group { display: grid; gap: 8px; }
.form-group label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-muted); }
.form-group input, .form-group textarea { background: transparent; border: none; border-bottom: 1px solid var(--border-str); padding: 10px 0; color: var(--text); font-size: 16px; font-family: var(--font-body); transition: border-color 0.2s; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-bottom-color: var(--accent-glow); }
.form-group textarea { resize: vertical; min-height: 80px; }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 64px 0 32px; margin-top: 60px; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; padding-bottom: 48px; border-bottom: 1px solid var(--border); }
.footer-brand p { color: var(--text-dim); font-size: 14px; margin-top: 20px; max-width: 320px; }
.footer-col h4 { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 20px; font-weight: 500; }
.footer-col ul { list-style: none; display: grid; gap: 12px; }
.footer-col a { color: var(--text-dim); font-size: 14px; transition: color 0.2s; }
.footer-col a:hover { color: var(--text); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 32px; font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); flex-wrap: wrap; gap: 16px; }

/* Reveal */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.8s, transform 0.8s; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1100px) {
  .svc-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 960px) {
  .nav-links { display: none; }
  .hero { padding: 110px 0 60px; }
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { aspect-ratio: 16/10; max-height: 400px; }
  .hero-metrics { grid-template-columns: repeat(2, 1fr); gap: 24px 0; }
  .metric { padding: 16px; padding-right: 16px; border-right: none; border-bottom: 1px solid var(--border); }
  .metric:nth-child(odd) { border-right: 1px solid var(--border); }
  .svc-grid { grid-template-columns: 1fr; }
  .about-inner { grid-template-columns: 1fr; gap: 48px; }
  .about-img { aspect-ratio: 16/10; max-height: 400px; }
  .process-item { grid-template-columns: 1fr; gap: 12px; padding: 24px 0; }
  .process-tag { text-align: left; }
  .ref-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .cta-block { padding: 48px 24px; }
  section { padding: 72px 0; }
  .container { padding: 0 20px; }
  .faq-q { font-size: 18px; }
  .section-banner { height: 220px; }
}
@media (max-width: 560px) {
  .hero-metrics { grid-template-columns: 1fr; }
  .metric:nth-child(odd) { border-right: none; }
  .ref-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .ref-marquee { animation: none; }
}

/* Logo image (gerçek E-Sistem logosu) */
.logo-img img {
  height: 36px;
  width: auto;
  display: block;
}
@media (max-width: 560px) {
  .logo-img img { height: 30px; }
}