:root {
  --lacivert: #0E1640;
  --metin: #2B3352;
  --soluk: #5E6684;
  --zemin: #FFFFFF;
  --zemin-2: #F4F6FB;
  --cizgi: #E1E5EF;
  --siber: #19B5D8;
  --yz: #8E6CF0;
  --yazilim: #4C8FF0;
  --kongre: #F0913A;
  --k-lacivert: #0D4A6B;
  --k-turkuaz: #36B9A6;
  --k-zemin: #EAF5F3;
  --sans: 'Archivo', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --kap: 1200px;
  --kenar: clamp(20px, 4vw, 40px);
  --ust-h: 76px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--ust-h); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--zemin); color: var(--metin);
  font-family: var(--sans); font-size: 18px; line-height: 1.6;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--lacivert); }
h1, h2, h3 { color: var(--lacivert); margin: 0; }
em { font-family: var(--serif); font-style: italic; font-weight: 400; }
:focus-visible { outline: 3px solid var(--siber); outline-offset: 3px; border-radius: 2px; }
[hidden] { display: none !important; }

.kap { width: 100%; max-width: var(--kap); margin: 0 auto; padding: 0 var(--kenar); }

.atla { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--lacivert); color: #fff; padding: 10px 16px; }
.atla:focus { left: 8px; }

/* Marka */
.marka { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: var(--lacivert); }
.marka svg { width: 38px; height: 38px; }
.marka span { font-size: 18px; font-weight: 300; font-stretch: 125%; letter-spacing: 0.06em; white-space: nowrap; }
.marka b { font-weight: 800; font-stretch: 112%; letter-spacing: 0.01em; }
.m-hilal { fill: var(--siber); }
.m-u { fill: var(--lacivert); }

/* Üst bar */
.ust {
  position: sticky; top: 0; z-index: 50; height: var(--ust-h);
  background: rgba(255, 255, 255, 0.92); backdrop-filter: saturate(1.4) blur(10px);
  transition: box-shadow .2s;
}
.ust.kaydi { box-shadow: 0 1px 0 var(--cizgi), 0 8px 24px rgba(14, 22, 64, 0.06); }
.ust-ic { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
nav { display: flex; align-items: center; gap: 32px; }
nav a { text-decoration: none; font-weight: 500; font-size: 16px; color: var(--metin); padding: 8px 0; }
nav a:hover { color: var(--lacivert); }
nav .menu-cta { color: #fff; background: var(--lacivert); padding: 10px 20px; border-radius: 999px; font-weight: 600; }
nav .menu-cta:hover { background: #1E2A66; color: #fff; }
.menu-dugme { display: none; }

/* Düğmeler */
.dugme {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px;
  padding: 12px 26px; border-radius: 999px; border: 2px solid transparent;
  font: 600 17px/1 var(--sans); text-decoration: none; cursor: pointer; transition: background .15s, color .15s, border-color .15s;
}
.dugme-dolu { background: var(--lacivert); color: #fff; }
.dugme-dolu:hover { background: #1E2A66; }
.dugme-yalin { color: var(--lacivert); border-color: var(--cizgi); background: transparent; }
.dugme-yalin:hover { border-color: var(--lacivert); }

/* Başlıklar */
.baslik {
  font-size: clamp(34px, 4.4vw, 60px); font-weight: 700; line-height: 1.08; letter-spacing: -0.015em;
  max-width: 18ch; margin-bottom: clamp(36px, 5vw, 64px);
}
.baslik em { font-size: 1.08em; letter-spacing: 0; }

/* Giriş */
.giris { padding: clamp(40px, 7vw, 96px) 0 clamp(40px, 5vw, 64px); border-bottom: 1px solid var(--cizgi); }
.giris-ic { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: center; gap: clamp(32px, 5vw, 72px); }
.giris h1 { font-size: clamp(40px, 6vw, 84px); font-weight: 700; line-height: 1.02; letter-spacing: -0.025em; }
.giris h1 em { font-size: 1.1em; letter-spacing: -0.01em; color: var(--lacivert); }
.giris-alt { font-size: clamp(18px, 1.6vw, 21px); color: var(--soluk); max-width: 46ch; margin: 28px 0 0; }
.butonlar { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

.giris-mark { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 18px; }
.giris-mark svg { width: 100%; max-width: 420px; overflow: visible; }
.seg { fill: none; stroke-width: 16; stroke: #DCE1EC; transition: stroke .5s ease, stroke-width .5s ease; }
.mark-u { fill: var(--lacivert); }
.mark-nokta { fill: var(--lacivert); transition: fill .5s ease; }
.giris-mark[data-aktif=""] .seg[data-alan="siber"],
.giris-mark[data-aktif="siber"] .seg[data-alan="siber"] { stroke: var(--siber); }
.giris-mark[data-aktif=""] .seg[data-alan="yz"],
.giris-mark[data-aktif="yz"] .seg[data-alan="yz"] { stroke: var(--yz); }
.giris-mark[data-aktif=""] .seg[data-alan="yazilim"],
.giris-mark[data-aktif="yazilim"] .seg[data-alan="yazilim"] { stroke: var(--yazilim); }
.giris-mark[data-aktif=""] .seg[data-alan="kongre"],
.giris-mark[data-aktif="kongre"] .seg[data-alan="kongre"] { stroke: var(--kongre); }
.giris-mark[data-aktif="siber"] .mark-nokta { fill: var(--siber); }
.giris-mark[data-aktif="yz"] .mark-nokta { fill: var(--yz); }
.giris-mark[data-aktif="yazilim"] .mark-nokta { fill: var(--yazilim); }
.giris-mark[data-aktif="kongre"] .mark-nokta { fill: var(--kongre); }
.mark-etiket { min-height: 1.6em; font-family: var(--serif); font-style: italic; font-size: 24px; color: var(--soluk); }

.alan-seridi {
  list-style: none; margin-top: clamp(40px, 6vw, 72px); padding-top: 24px; padding-bottom: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px;
  border-top: 1px solid var(--cizgi);
}
.alan-seridi li { display: flex; align-items: center; gap: 12px; font-weight: 600; color: var(--soluk); transition: color .3s; cursor: default; }
.alan-seridi i { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; transition: transform .3s; }
.alan-seridi li[data-alan="siber"] i { background: var(--siber); }
.alan-seridi li[data-alan="yz"] i { background: var(--yz); }
.alan-seridi li[data-alan="yazilim"] i { background: var(--yazilim); }
.alan-seridi li[data-alan="kongre"] i { background: var(--kongre); }
.alan-seridi li.aktif { color: var(--lacivert); }
.alan-seridi li.aktif i { transform: scale(1.5); }

/* Hakkımızda */
.hakkimizda { padding: clamp(64px, 9vw, 128px) 0; }
.denklem {
  display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1.3fr);
  align-items: start; gap: 24px clamp(16px, 2.5vw, 36px);
}
.terim p { margin: 0; color: var(--soluk); }
.terim .kelime { font-family: var(--serif); font-style: italic; font-size: clamp(44px, 5vw, 68px); line-height: 1; color: var(--lacivert); margin-bottom: 14px; }
.sonuc .kelime { font-family: var(--sans); font-style: normal; font-weight: 800; font-size: clamp(32px, 3.6vw, 48px); line-height: 1.15; letter-spacing: -0.02em; }
.sonuc p:not(.kelime) { color: var(--metin); font-weight: 500; font-size: 19px; }
.isaret { font-family: var(--serif); font-size: clamp(44px, 5vw, 68px); line-height: 1; color: #B6BDD0; }

/* Hizmetler */
.hizmetler { background: var(--zemin-2); padding: clamp(64px, 9vw, 128px) 0; }
.gezgin { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(24px, 4vw, 56px); align-items: stretch; }
.gezgin-liste { display: flex; flex-direction: column; }
.gezgin-liste button {
  display: flex; align-items: baseline; gap: 18px; width: 100%; text-align: left; cursor: pointer;
  background: none; border: 0; border-bottom: 1px solid var(--cizgi); padding: 22px 4px;
  font: 600 clamp(24px, 2.6vw, 34px)/1.15 var(--sans); letter-spacing: -0.01em; color: var(--soluk);
  transition: color .2s;
}
.gezgin-liste button:first-child { border-top: 1px solid var(--cizgi); }
.gezgin-liste button:hover { color: var(--lacivert); }
.gezgin-liste button[aria-selected="true"] { color: var(--lacivert); }
.gezgin-liste .no { font-family: var(--serif); font-style: italic; font-weight: 400; font-size: 0.75em; min-width: 1.6em; color: #9AA2BC; }
.gezgin-liste button[aria-selected="true"] .no { color: var(--renk, var(--lacivert)); }
.gezgin-liste [data-alan="siber"] { --renk: var(--siber); }
.gezgin-liste [data-alan="yz"] { --renk: var(--yz); }
.gezgin-liste [data-alan="yazilim"] { --renk: var(--yazilim); }
.gezgin-liste [data-alan="kongre"] { --renk: var(--kongre); }

.gezgin-panel {
  --renk: var(--siber);
  position: relative; overflow: hidden; border-radius: 20px; background: #fff;
  padding: clamp(28px, 4vw, 48px); min-height: 380px;
  display: flex; flex-direction: column; justify-content: flex-end; gap: 14px;
  box-shadow: 0 1px 2px rgba(14, 22, 64, 0.05), 0 18px 48px rgba(14, 22, 64, 0.06);
}
.gezgin-panel[data-alan="yz"] { --renk: var(--yz); }
.gezgin-panel[data-alan="yazilim"] { --renk: var(--yazilim); }
.gezgin-panel[data-alan="kongre"] { --renk: var(--kongre); }
.panel-mark { position: absolute; right: -40px; top: -30px; width: 260px; opacity: 0.95; }
.p-hilal { fill: var(--renk); transition: fill .3s; }
.p-u { fill: var(--lacivert); }
.panel-baslik { font-size: clamp(30px, 3.4vw, 44px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; max-width: 12ch; }
.panel-metin { margin: 0; font-size: 20px; color: var(--soluk); max-width: 34ch; }
.panel-dugme { align-self: flex-start; margin-top: 12px; }
.gezgin-panel.gecis .panel-baslik, .gezgin-panel.gecis .panel-metin { animation: belir .35s ease; }
@keyframes belir { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* Kongrera */
.kongrera { background: var(--k-zemin); padding: clamp(64px, 9vw, 120px) 0; }
.kongrera-ic { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 80px); align-items: center; }
.kongrera-kimlik { display: flex; flex-direction: column; align-items: flex-start; gap: 24px; }
.kongrera-logo {
  width: clamp(120px, 14vw, 180px); aspect-ratio: 1; flex-shrink: 0; border-radius: 50%; background: #fff;
  display: flex; align-items: center; justify-content: center; box-shadow: 0 10px 30px rgba(13, 74, 107, 0.12);
}
.kongrera-logo img { width: 64%; height: auto; }
.urun-imza { margin: 0 0 6px; font-family: var(--serif); font-style: italic; font-size: 22px; color: var(--k-lacivert); }
.kongrera-ad { color: var(--k-lacivert); font-size: clamp(44px, 5.4vw, 72px); font-weight: 800; letter-spacing: 0.01em; line-height: 1; text-transform: uppercase; }
.kongrera-tanim { margin: 10px 0 0; font-size: 19px; color: #3F6375; }
.ozellik { list-style: none; margin: 0 0 32px; padding: 0; }
.ozellik li {
  display: flex; align-items: baseline; justify-content: space-between; gap: 16px;
  padding: 18px 0; border-bottom: 1px solid rgba(13, 74, 107, 0.18);
  font-size: clamp(20px, 2vw, 24px); font-weight: 600; color: var(--k-lacivert);
}
.ozellik li:first-child { border-top: 1px solid rgba(13, 74, 107, 0.18); }
.ozellik li span::before { content: ''; display: inline-block; width: 10px; height: 10px; margin-right: 14px; border-radius: 50%; background: var(--k-turkuaz); vertical-align: 0.12em; }
.ozellik em { font-size: 22px; color: #2C7F73; }
.kongrera-linkler { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; }
.dugme-kongrera { background: var(--k-lacivert); color: #fff; }
.dugme-kongrera:hover { background: #12607F; }
.kongrera-ig { font-weight: 600; color: var(--k-lacivert); }

/* İletişim */
.iletisim { padding: clamp(64px, 9vw, 128px) 0; }
.iletisim-ic { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 96px); }
.iletisim-sol p { margin: 0; color: var(--soluk); max-width: 40ch; }
.kanallar { margin: 36px 0 0; display: grid; grid-template-columns: auto 1fr; gap: 10px 24px; }
.kanallar dt { font-weight: 600; color: var(--lacivert); }
.kanallar dd { margin: 0; }
.form { display: flex; flex-direction: column; gap: 20px; background: var(--zemin-2); border-radius: 20px; padding: clamp(24px, 4vw, 40px); }
.alan { display: flex; flex-direction: column; gap: 8px; }
label { font-weight: 600; font-size: 16px; color: var(--lacivert); }
.ops { font-weight: 400; color: var(--soluk); }
input, select, textarea {
  width: 100%; font: 400 17px/1.4 var(--sans); color: var(--lacivert); background: #fff;
  border: 1.5px solid #CDD3E2; border-radius: 10px; padding: 13px 14px;
}
textarea { resize: vertical; min-height: 150px; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--lacivert); box-shadow: 0 0 0 3px rgba(25, 181, 216, 0.3); }
[aria-invalid="true"] { border-color: #B42318; }
.hata { color: #B42318; font-size: 15px; font-weight: 600; }
.form .dugme { align-self: flex-start; }
.form-not { margin: 0; font-size: 15px; color: var(--soluk); min-height: 1.4em; }

/* Alt bilgi */
.alt { background: var(--lacivert); color: #C9D0E0; padding: 40px 0; }
.alt-ic { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 32px; }
.alt p { margin: 0; font-size: 15px; }
.marka-acik { color: #fff; }
.marka-acik .m-u { fill: #fff; }
.alt-linkler { display: flex; gap: 22px; }
.alt-linkler a { color: #fff; }

/* Duyarlı */
@media (max-width: 900px) {
  .giris-ic, .gezgin, .kongrera-ic, .iletisim-ic { grid-template-columns: 1fr; }
  .giris-mark { order: -1; }
  .giris-mark svg { max-width: 220px; }
  .alan-seridi { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .denklem { grid-template-columns: 1fr; }
  .isaret { font-size: 40px; }
  .gezgin-panel { min-height: 320px; }
}
@media (max-width: 720px) {
  .menu-dugme {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 6px;
    width: 48px; height: 48px; padding: 12px; background: none; border: 0; cursor: pointer;
  }
  .menu-dugme span { display: block; height: 2px; background: var(--lacivert); transition: transform .2s; }
  .menu-dugme[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-dugme[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }
  nav {
    display: none; position: absolute; left: 0; right: 0; top: var(--ust-h);
    flex-direction: column; align-items: stretch; gap: 0; background: #fff;
    padding: 8px var(--kenar) 20px; box-shadow: 0 12px 24px rgba(14, 22, 64, 0.08);
  }
  nav.acik { display: flex; }
  nav a { padding: 14px 0; border-bottom: 1px solid var(--cizgi); font-size: 18px; }
  nav .menu-cta { margin-top: 14px; text-align: center; border-bottom: 0; }
  .marka span { font-size: 16px; }
  .panel-mark { width: 180px; right: -30px; top: -24px; }
  .kongrera-kimlik { flex-direction: column; align-items: flex-start; }
  .form .dugme { align-self: stretch; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}