:root {
  --ink: #071d4b;
  --ink-2: #123064;
  --cyan: #09c7f5;
  --violet: #7047ff;
  --paper: #f7f9fd;
  --white: #ffffff;
  --muted: #5d6b84;
  --line: #dce3ee;
  --max: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }

.site-header {
  width: min(calc(100% - 48px), var(--max));
  height: 92px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 20;
}
.brand img { width: 170px; display: block; }
.nav { display: flex; gap: 38px; font-size: 14px; font-weight: 600; }
.nav a { padding: 10px 0; }
.header-cta { padding: 10px 0; }
.nav a, .header-cta, .text-link { position: relative; }
.nav a::after, .text-link::after {
  content: ""; position: absolute; height: 1px; left: 0; right: 100%; bottom: 6px;
  background: currentColor; transition: right .25s ease;
}
.nav a:hover::after, .text-link:hover::after { right: 0; }
.header-cta { justify-self: end; font-size: 14px; font-weight: 700; color: var(--violet); }
.menu-button { display: none; background: none; border: 0; padding: 12px; }
.menu-button span { display: block; width: 24px; height: 2px; background: var(--ink); margin: 5px 0; }

.hero {
  width: min(calc(100% - 48px), var(--max));
  min-height: 710px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  align-items: center;
  gap: 42px;
  padding: 70px 0 76px;
}
.intro { margin: 0 0 24px; font-size: 14px; font-weight: 700; color: var(--violet); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 28px; font-size: clamp(48px, 5.3vw, 80px); line-height: .98; letter-spacing: -.065em; font-weight: 600; }
.hero-text { max-width: 590px; margin-bottom: 38px; font-size: 18px; line-height: 1.72; color: var(--muted); }
.hero-actions { display: flex; align-items: center; gap: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 54px; padding: 0 26px; border-radius: 4px; font-size: 14px; font-weight: 700; }
.button-primary { background: var(--ink); color: var(--white); transition: transform .2s ease, background .2s ease; }
.button-primary:hover { background: var(--violet); transform: translateY(-2px); }
.text-link { font-size: 14px; font-weight: 700; }

.signal-field { position: relative; min-height: 600px; }
.signal-field svg { width: 100%; height: 100%; overflow: visible; }
.orbit { fill: none; stroke: #dbe4f0; stroke-width: 1.5; stroke-dasharray: 6 10; }
.orbit-short { opacity: .7; }
.signal-line { fill: none; stroke: url(#cyanLine); stroke-width: 4; stroke-linecap: round; opacity: .75; }
.node { stroke: var(--paper); stroke-width: 14; }
.core, .node-navy { fill: var(--ink); }
.node-cyan { fill: var(--cyan); }
.node-violet { fill: var(--violet); }
.pulse { fill: white; filter: drop-shadow(0 0 10px var(--cyan)); }
.pulse-one { offset-path: path("M156 306 C250 306 284 177 408 177 S530 128 575 90"); animation: travel 3.4s infinite ease-in-out; }
.pulse-two { offset-path: path("M156 306 C250 306 302 306 422 306 S523 306 593 306"); animation: travel 3.4s .6s infinite ease-in-out; }
.pulse-three { offset-path: path("M156 306 C250 306 284 435 408 435 S530 482 575 522"); animation: travel 3.4s 1.2s infinite ease-in-out; }
@keyframes travel { 0%, 10% { offset-distance: 0; opacity: 0; } 20%, 80% { opacity: 1; } 90%, 100% { offset-distance: 100%; opacity: 0; } }
.signal-copy, .signal-output { position: absolute; z-index: 2; display: flex; flex-direction: column; gap: 4px; }
.signal-copy { top: 48%; left: 0; transform: translateY(-50%); }
.signal-output { right: 0; bottom: 0; text-align: right; }
.signal-copy span, .signal-output span { color: var(--muted); font-size: 12px; }
.signal-copy strong, .signal-output strong { font-size: 14px; }

.trust-line { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-line span { padding: 25px 32px; text-align: center; font-size: 13px; color: var(--muted); border-right: 1px solid var(--line); }
.trust-line span:last-child { border: 0; }
.section { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 140px 0; }
.section-heading { display: grid; grid-template-columns: 1fr .8fr; gap: 100px; align-items: end; margin-bottom: 80px; }
h2 { font-size: clamp(40px, 4.6vw, 64px); line-height: 1.04; letter-spacing: -.055em; font-weight: 600; }
.section-heading p, .approach-copy > p { max-width: 550px; margin-bottom: 0; color: var(--muted); line-height: 1.8; }
.service-list { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); }
.service-item { min-height: 400px; padding: 44px 44px 34px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); display: flex; flex-direction: column; }
.service-item:nth-child(2n) { border-right: 0; padding-right: 0; }
.service-item:nth-child(2n+1) { padding-left: 0; }
.service-item:nth-last-child(-n+2) { border-bottom: 0; }
.service-stage { margin: 0 0 22px; font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--violet); }
.service-item h3 { margin: 30px 0 16px; font-size: 23px; }
.service-example { margin: 0 0 18px; padding-left: 15px; border-left: 2px solid var(--line); font-size: 14px; line-height: 1.65; color: var(--muted); }
.service-example span { display: block; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: #8d99ad; margin-bottom: 3px; }
.service-item p { color: var(--muted); line-height: 1.72; }
.service-meta { margin-top: auto; font-size: 12px; color: var(--violet); font-weight: 700; }
.service-icon { width: 68px; height: 56px; position: relative; }
.service-icon span, .service-icon i, .service-icon b { position: absolute; width: 14px; height: 14px; border-radius: 50%; background: var(--ink); }
.service-icon span { left: 0; top: 21px; }
.service-icon i { right: 0; top: 0; background: var(--cyan); }
.service-icon b { right: 0; bottom: 0; background: var(--violet); }
.service-icon::before, .service-icon::after { content: ""; position: absolute; left: 11px; width: 48px; height: 2px; top: 26px; background: var(--ink); transform-origin: left; }
.service-icon::before { transform: rotate(-27deg); }
.service-icon::after { transform: rotate(27deg); }
.service-icon.flow::before { transform: rotate(0); background: var(--cyan); }
.service-icon.flow::after { transform: rotate(0); top: 38px; background: var(--violet); }
.service-icon.software { border: 2px solid var(--ink); width: 65px; height: 48px; }
.service-icon.software span { left: 10px; top: 9px; width: 9px; height: 9px; }
.service-icon.software i { left: 26px; top: 9px; width: 9px; height: 9px; }
.service-icon.software b { left: 42px; top: 9px; width: 9px; height: 9px; }
.service-icon.software::before { left: 9px; top: 29px; width: 43px; transform: none; }
.service-icon.software::after { display: none; }
.service-icon.voice { width: 64px; height: 52px; }
.service-icon.voice::before, .service-icon.voice::after { display: none; }
.service-icon.voice span, .service-icon.voice i, .service-icon.voice b { width: 6px; border-radius: 3px; top: 50%; right: auto; transform: translateY(-50%); }
.service-icon.voice span { left: 4px; height: 18px; background: var(--ink); }
.service-icon.voice i { left: 20px; height: 40px; background: var(--cyan); }
.service-icon.voice b { left: 36px; height: 26px; background: var(--violet); }
.service-icon.voice::after { display: block; content: ""; left: 52px; top: 50%; width: 6px; height: 10px; border-radius: 3px; background: var(--ink); opacity: .35; transform: translateY(-50%); }
.service-icon.data { width: 62px; height: 52px; }
.service-icon.data::before, .service-icon.data::after { display: none; }
.service-icon.data span, .service-icon.data i, .service-icon.data b { width: 13px; border-radius: 2px; top: auto; bottom: 0; }
.service-icon.data span { left: 0; right: auto; height: 26px; background: var(--ink); }
.service-icon.data i { left: 22px; right: auto; height: 46px; background: var(--cyan); }
.service-icon.data b { left: 44px; right: auto; height: 34px; background: var(--violet); }

.approach { width: 100%; max-width: none; padding: 130px max(24px, calc((100vw - var(--max)) / 2)); display: grid; grid-template-columns: .9fr 1.1fr; gap: 110px; background: var(--ink); color: white; }
.approach-copy > p { color: #aebbd0; margin-bottom: 38px; }
.text-link.light { color: var(--cyan); }
.process { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.18); }
.process li { display: grid; grid-template-columns: 55px 1fr; gap: 18px; padding: 27px 0; border-bottom: 1px solid rgba(255,255,255,.18); }
.process li > span { font-size: 12px; color: var(--cyan); }
.process strong { display: block; font-size: 19px; margin-bottom: 7px; }
.process p { margin: 0; color: #aebbd0; line-height: 1.5; font-size: 14px; }

.contact { display: grid; grid-template-columns: 1fr .95fr; gap: 90px; align-items: start; }
.contact h2 { margin-bottom: 44px; }
.contact-link { min-width: 370px; padding: 22px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); display: flex; justify-content: space-between; gap: 30px; font-size: 17px; font-weight: 700; }
.contact-link i { font-style: normal; color: var(--violet); font-size: 22px; transition: transform .2s ease; }
.contact-link:hover i { transform: translate(4px, -4px); }
.site-footer { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 66px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-top-row { display: grid; grid-template-columns: 1.3fr .85fr .85fr; gap: 60px; padding-bottom: 46px; }
.footer-brand img { width: 38px; height: 38px; object-fit: contain; margin-bottom: 18px; display: block; }
.footer-brand p { margin: 0; max-width: 330px; line-height: 1.75; }
.footer-col { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; }
.footer-col h2 { font-size: 12px; font-weight: 700; color: var(--ink); letter-spacing: 0; line-height: 1.4; margin: 0 0 4px; }
.footer-col a { color: var(--muted); padding: 8px 0; transition: color .2s ease; }
.footer-col a:hover { color: var(--violet); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-top: 26px; border-top: 1px solid var(--line); font-size: 12px; }
.footer-bottom p { margin: 0; }
.footer-links { display: flex; align-items: center; gap: 24px; }
.footer-links a { padding: 8px 0; }
.ig-link { display: inline-flex; align-items: center; gap: 9px; transition: color .2s ease; }
.ig-link:hover { color: var(--violet); }
.ig-link svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.ig-link .ig-dot { fill: currentColor; stroke: none; }

:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }
@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; }
  .nav, .header-cta { display: none; }
  .nav.open { display: flex; position: absolute; top: 76px; left: 0; right: 0; padding: 24px; background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; }
  .menu-button { display: block; }
  .hero { grid-template-columns: 1fr; padding-top: 80px; }
  .signal-field { min-height: 500px; }
  .section-heading, .approach, .contact { grid-template-columns: 1fr; gap: 50px; }
  .service-list { grid-template-columns: 1fr; }
  .service-item, .service-item:nth-child(2n), .service-item:nth-child(2n+1) { min-height: 280px; padding: 36px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .service-item:last-child { border-bottom: 0; }
  .contact-link { min-width: 0; }
}
@media (max-width: 600px) {
  .site-header, .hero, .section, footer { width: min(calc(100% - 32px), var(--max)); }
  .site-header { height: 76px; }
  .brand img { width: 142px; }
  .hero { min-height: 0; padding: 62px 0 45px; }
  h1 { font-size: min(12.4vw, 50px); }
  h2 { font-size: min(9.4vw, 40px); }
  .services h2 { font-size: min(8.9vw, 36px); }
  .hero-text { font-size: 16px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 22px; }
  .signal-field { min-height: 350px; margin-top: -30px; }
  .signal-copy { left: -3px; }
  .signal-output { bottom: -8px; }
  .trust-line { grid-template-columns: 1fr 1fr; }
  .trust-line span { padding: 19px 10px; border-bottom: 1px solid var(--line); }
  .section { padding: 92px 0; }
  .section-heading { margin-bottom: 48px; }
  .approach { width: 100%; padding: 92px 16px; }
  .contact-link { font-size: 14px; }
  .footer-top-row { grid-template-columns: 1fr; gap: 36px; padding-bottom: 34px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 14px; font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Skip link */
.skip-link { position: absolute; left: -9999px; top: 0; z-index: 100; padding: 12px 20px; background: var(--ink); color: var(--white); font-size: 14px; font-weight: 700; }
.skip-link:focus { left: 12px; top: 12px; }

/* Iletisim formu */
.contact-form { display: flex; flex-direction: column; gap: 22px; }
.hp-field { position: absolute; left: -9999px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 12px; font-weight: 700; color: var(--muted); letter-spacing: .02em; }
.field input, .field textarea {
  font: inherit; font-size: 16px; color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line); border-radius: 4px;
  padding: 14px 16px; width: 100%;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.field textarea { resize: vertical; min-height: 118px; line-height: 1.6; }
.field input:hover, .field textarea:hover { border-color: #b9c6db; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--violet); box-shadow: 0 0 0 3px rgba(112, 71, 255, .13); }
.field input:user-invalid, .field textarea:user-invalid { border-color: #c2413b; }
.contact-form button { align-self: flex-start; min-width: 168px; }
.contact-form button[disabled] { opacity: .55; pointer-events: none; }
.form-status { margin: 0; font-size: 14px; line-height: 1.6; min-height: 1px; }
.form-status.ok { color: #14764f; font-weight: 700; }
.form-status.err { color: #c2413b; font-weight: 700; }

/* Tesekkur sayfasi */
.thanks { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 150px 0 170px; }
.thanks h1 { font-size: clamp(44px, 5.4vw, 76px); margin-bottom: 26px; }
.thanks p { max-width: 520px; font-size: 18px; line-height: 1.72; color: var(--muted); margin-bottom: 40px; }

@media (max-width: 900px) {
  .contact { grid-template-columns: 1fr; gap: 54px; }
  .contact h2 { margin-bottom: 34px; }
}
@media (max-width: 600px) {
  .thanks { width: min(calc(100% - 32px), var(--max)); padding: 96px 0 110px; }
  .thanks h1 { font-size: 44px; }
  .contact-form button { align-self: stretch; }
}

/* ============ Kullanim senaryolari ============ */
.case-list { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.case-list li { padding: 40px 40px 42px; border-right: 1px solid var(--line); }
.case-list li:last-child { border-right: 0; padding-right: 0; }
.case-list li:first-child { padding-left: 0; }
.case-no { display: block; margin-bottom: 26px; font-size: 12px; font-weight: 700; letter-spacing: .08em; color: var(--violet); }
.case-list h3 { margin: 0 0 14px; font-size: 21px; line-height: 1.3; }
.case-list p { margin: 0; color: var(--muted); line-height: 1.75; }

/* ============ Veri ve guven ============ */
.trust-points { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 70px; border-top: 1px solid var(--line); }
.trust-points li { position: relative; padding: 26px 0 26px 30px; border-bottom: 1px solid var(--line); color: var(--muted); line-height: 1.7; }
.trust-points li::before { content: ""; position: absolute; left: 0; top: 33px; width: 9px; height: 9px; border-radius: 50%; background: var(--cyan); }
.trust-points li:nth-last-child(-n+2) { border-bottom: 0; }

/* ============ Neden OSBTech ============ */
.why h2 { margin-bottom: 64px; }
.why-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 44px; }
.why-list article { padding-top: 26px; border-top: 2px solid var(--ink); }
.why-list h3 { margin: 0 0 20px; font-size: 19px; line-height: 1.35; }
.why-common, .why-ours { margin: 0 0 12px; line-height: 1.7; font-size: 15px; }
.why-common { color: #8d99ad; }
.why-ours { color: var(--ink); font-weight: 600; margin-bottom: 0; }

/* ============ Hakkinda ============ */
.about { max-width: 860px; }
.about h2 { margin-bottom: 30px; }
.about > p { font-size: 19px; line-height: 1.75; color: var(--muted); margin-bottom: 14px; }
.about-legal { font-size: 14px; color: #8d99ad; margin-bottom: 0; }

/* ============ Iletisim eklemeleri ============ */
.contact-text { margin: 30px 0 0; max-width: 430px; color: var(--muted); line-height: 1.75; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.field-opt { font-weight: 400; color: #8d99ad; letter-spacing: 0; }
.field select {
  font: inherit; font-size: 16px; color: var(--ink); background: var(--white);
  border: 1px solid var(--line); border-radius: 4px; padding: 14px 44px 14px 16px; width: 100%;
  appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%235d6b84' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 16px center; background-size: 12px 8px;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.field select:hover { border-color: #b9c6db; }
.field select:focus { outline: none; border-color: var(--violet); box-shadow: 0 0 0 3px rgba(112, 71, 255, .13); }
.field input[aria-invalid="true"], .field textarea[aria-invalid="true"], .field select[aria-invalid="true"] { border-color: #b5352f; }
.field-error { margin: 7px 0 0; font-size: 13px; font-weight: 600; color: #b5352f; }
.field-error::before { content: "! "; font-weight: 700; }
.form-privacy { margin: 4px 0 0; font-size: 13px; line-height: 1.65; color: #8d99ad; max-width: 430px; }
.form-privacy a { text-decoration: underline; }

/* ============ Mobil ve orta genislikler ============ */
@media (max-width: 1100px) {
  .why-list { grid-template-columns: repeat(2, 1fr); gap: 40px 44px; }
  .case-list { grid-template-columns: 1fr; }
  .case-list li { padding: 34px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .case-list li:last-child { border-bottom: 0; }
  .footer-top-row { grid-template-columns: 1fr 1fr; gap: 44px; }
}
@media (max-width: 900px) {
  .trust-points { grid-template-columns: 1fr; gap: 0; }
  .trust-points li:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }
  .trust-points li:last-child { border-bottom: 0; }
  .contact-text { max-width: none; }
  .ig-link { padding: 13px 0; }
  .footer-col a { padding: 13px 0; }
  .footer-links .footer-top { padding: 13px 0; }
  .text-link { padding: 14px 0; }
}
@media (max-width: 600px) {
  .why-list { grid-template-columns: 1fr; gap: 34px; }
  .why h2 { margin-bottom: 44px; }
  .about > p { font-size: 17px; }
  .field-row { grid-template-columns: 1fr; gap: 22px; }
  .case-list h3 { font-size: 19px; }
  .site-footer { width: min(calc(100% - 32px), var(--max)); padding-top: 52px; }
}