/* ==========================================================================
   EDUPTIVE — STIL DOSYASI  (v2 — "The Adaptive Mesh")
   --------------------------------------------------------------------------
   Icindekiler
   01  Yazi tipleri
   02  Tasarim degiskenleri
   03  Sifirlama
   04  Tipografi
   05  Duzen
   06  Atmosfer katmanlari
   07  Ust ilerleme cizgisi
   08  Header ve menu
   09  Tasarim sistemi: butonlar, cipler, ikonlar
   10  Tasarim sistemi: kart materyali ve panel
   11  Bolum 1 — Hero
   12  Bolum 2 — Problem
   13  Bolum 3 — Vision
   14  Bolum 4 — Approach
   15  Bolum 5 — Technology
   16  Bolum 6 — Science
   17  Bolum 7 — Validation
   18  Bolum 8 — Founder
   19  Bolum 9 — Contact
   20  Footer
   21  Belirme animasyonlari
   22  Mobil uyum
   23  Hareket azaltma tercihi
   ========================================================================== */


/* ==========================================================================
   01  YAZI TIPLERI
   Font dosyalari assets/fonts/ klasorunde. Bkz. OKUBENI.md
   ========================================================================== */

@font-face {
  font-family: 'Satoshi';
  src: url('../fonts/Satoshi-Variable.woff2') format('woff2-variations');
  font-weight: 300 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('../fonts/JetBrainsMono-Regular.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}


/* ==========================================================================
   02  TASARIM DEGISKENLERI
   Sitenin tum renk ve olculeri burada. Birini degistirin, her yer degissin.
   ========================================================================== */

:root {

  /* --- Zemin: obsidyen --- */
  --void:       #03040A;
  --void-2:     #05070F;

  /* --- Yuzeyler: hepsi seffaf, zemin uzerinde katman olusturur --- */
  --surf-1:     rgba(255,255,255,.024);
  --surf-2:     rgba(255,255,255,.045);
  --surf-3:     rgba(255,255,255,.07);

  /* --- Cizgiler --- */
  --line:       rgba(255,255,255,.075);
  --line-2:     rgba(255,255,255,.14);

  /* --- Metin ---
     text-3 kucuk mono etiketlerde kullanilir. Zemine karsi 5.7:1 kontrast
     verir (WCAG AA esigi 4.5:1). Daha soluk bir tona DUSURMEYIN. */
  --text:       #F2F6FF;
  --text-2:     #A6B4CC;
  --text-3:     #7A88A2;

  /* --- RENK DILI --------------------------------------------------------
     Soguk = sistemin kendisi: mimari, karar motoru, altyapi.
     Sicak = bireyin bulundugu her yer: sistemin bir kisiye cevap verdigi an.
     Sicak renk sayfa yuzeyinin %3'unu asmamalidir. Kurali bozmayin;
     gucunu az kullanilmasindan aliyor.
     -------------------------------------------------------------------- */
  --blue:       #2E6BFF;   /* sistem — ana                     */
  --blue-lo:    #1B4FD8;   /* sistem — derinlik                */
  --cyan:       #22D3EE;   /* sistem — canli/aktif durum       */
  --violet:     #7C5CFF;   /* sistem — atmosferik derinlik     */

  --warm:       #FFA24F;   /* BIREY — ogrenci                  */
  --warm-soft:  #FFC48F;   /* BIREY — hale, yumusak isik       */

  --blue-a12:   rgba(46,107,255,.12);
  --blue-a24:   rgba(46,107,255,.24);
  --cyan-a20:   rgba(34,211,238,.20);
  --warm-a18:   rgba(255,162,79,.18);
  --warm-a30:   rgba(255,162,79,.30);

  /* --- Yazi tipleri --- */
  --font: 'Satoshi', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  /* --- Olculer --- */
  --wrap:    1220px;
  --measure: 660px;
  --r-sm:    10px;
  --r-md:    16px;
  --r-lg:    22px;

  /* --- Dikey ritim --- */
  --pad-sec:  clamp(88px, 9.5vw, 140px);   /* normal bolumler          */
  --pad-hero: clamp(128px, 15vw, 200px);   /* hero — dramatik          */
  --pad-cta:  clamp(140px, 16vw, 220px);   /* final CTA — dramatik     */
  --pad-head: clamp(44px, 5.2vw, 72px);    /* baslik ile icerik arasi  */

  /* --- Hareket: agirbasli, zipmayan egriler --- */
  --e-out:  cubic-bezier(.22,.61,.36,1);
  --e-soft: cubic-bezier(.16,1,.30,1);
  --e-in:   cubic-bezier(.55,.06,.68,.19);

  /* --- JS tarafindan guncellenen degiskenler --- */
  --cx: 50vw;
  --cy: 30vh;
  --vw: 100vw;   /* kaydirma cubugu haric gercek pencere genisligi */
}


/* ==========================================================================
   03  SIFIRLAMA
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;                    /* mobilde yatay kaymayi engeller */
}

body {
  background: var(--void);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.72;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, canvas { display: block; max-width: 100%; }
img { height: auto; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 3000;
  padding: 10px 18px; border-radius: 8px;
  background: var(--blue); color: #fff; font-size: 14px;
  transition: top .25s var(--e-out);
}
.skip-link:focus { top: 16px; }


/* ==========================================================================
   04  TIPOGRAFI
   Akiskan olcek: ekran genisligine gore kendiliginden buyur/kucultur.
   ========================================================================== */

/* Punto ust siniri hero metin sutununun genisligine gore belirlendi.
   Daha buyugu "Education Should Adapt" satirini ikiye boler ve baslik
   dort satira tasar. Degistirirseniz .hero-in sutun oranini da ayarlayin. */
h1 {
  font-size: clamp(2.8rem, 5.4vw, 4.4rem);
  font-weight: 600;
  line-height: .98;
  letter-spacing: -.045em;
  color: var(--text);
}
/* Basligin iki satiri: ilki duz beyaz, ikincisi spektrumda erir */
.h1-a, .h1-b { display: block; }
.h1-b {
  background: linear-gradient(96deg, #FFFFFF 0%, #A9C6FF 42%, var(--cyan) 92%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

h2 {
  font-size: clamp(2.1rem, 4.2vw, 3.5rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -.035em;
  color: var(--text);
  text-wrap: balance;
}
/* h1'den KUCUK kalmali; buyurse bolum basligi sayfa basligini bastirir. */
.h2-xl { font-size: clamp(2.2rem, 4.6vw, 3.9rem); line-height: 1.04; letter-spacing: -.042em; }

h3 {
  font-size: 1.22rem; font-weight: 600; line-height: 1.32;
  letter-spacing: -.022em; color: var(--text);
}

.lead {
  font-size: clamp(1.06rem, 1.45vw, 1.32rem);
  line-height: 1.5;
  letter-spacing: -.014em;
  color: var(--text);
  max-width: 34ch;
  text-wrap: pretty;
}
.lead-xl { max-width: 44ch; }
.head-center .lead, .call-in .lead, .vision-in .lead { margin-inline: auto; }

.body { color: var(--text-2); max-width: 62ch; }
.body + .body { margin-top: 1.15em; }

/* Bolum ust etiketi: 01 — PROBLEM */
.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  margin-bottom: 24px;
  font-family: var(--mono);
  font-size: .705rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow i {
  font-style: normal; color: var(--text-3);
  padding-right: 12px; border-right: 1px solid var(--line-2);
}

.mono {
  font-family: var(--mono);
  font-size: .69rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--text-3);
}


/* ==========================================================================
   05  DUZEN
   ========================================================================== */

.wrap { width: min(100% - 44px, var(--wrap)); margin-inline: auto; }

.section { position: relative; padding-block: var(--pad-sec); }

/* Bolum ustundeki iraksama ayraci — logodan tureyen imza motifi */
.section::before {
  content: ""; position: absolute; top: 0; left: 50%;
  width: min(560px, 74%); height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, var(--line-2) 22%, var(--blue-a24) 50%, var(--line-2) 78%, transparent);
  opacity: .8;
}
.section-vision::before, .section-call::before { opacity: .45; }

.section-alt { background:
  radial-gradient(120% 100% at 50% 0%, rgba(255,255,255,.022), transparent 62%); }

.head { margin-bottom: var(--pad-head); max-width: 820px; }
.head-center { margin-inline: auto; text-align: center; }
.head h2 { margin-bottom: 22px; }

.measure { max-width: var(--measure); }
.measure-center { margin-inline: auto; text-align: center; }
.measure-center .body { margin-inline: auto; }

.split {
  display: grid;
  grid-template-columns: minmax(0,1fr) minmax(0,1fr);
  gap: clamp(44px, 5.5vw, 88px);
  align-items: center;
}


/* ==========================================================================
   06  ATMOSFER KATMANLARI
   Hepsi sabit konumlu, tiklama almaz, sadece transform/opacity ile hareket
   eder. Boylece hicbiri yeniden yerlesim (reflow) tetiklemez.
   ========================================================================== */

.atmos { position: fixed; pointer-events: none; }

/* Cok ince izgara — merkeze dogru belirir, kenarlarda kaybolur */
.atmos-grid {
  inset: 0; z-index: -4;
  background-image:
    linear-gradient(rgba(255,255,255,.026) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.026) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(ellipse 78% 62% at 50% 26%, #000 0%, transparent 78%);
          mask-image: radial-gradient(ellipse 78% 62% at 50% 26%, #000 0%, transparent 78%);
  will-change: transform;
}

/* Sayfanin ust tarafindaki tek buyuk isik — scroll ile hafifce kayar */
.atmos-aura {
  top: -420px; left: 50%; z-index: -3;
  width: min(1240px, 165vw); height: min(1000px, 125vh);
  transform: translate3d(-50%, 0, 0);
  background:
    radial-gradient(closest-side, rgba(46,107,255,.26), transparent 70%),
    radial-gradient(closest-side, rgba(124,92,255,.10), transparent 72%);
  filter: blur(40px);
  will-change: transform;
}

/* Imleci takip eden yumusak isik — sadece masaustunde acilir */
.atmos-cursor {
  top: 0; left: 0; z-index: -2;
  width: 620px; height: 620px; margin: -310px 0 0 -310px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(46,107,255,.11), transparent 68%);
  opacity: 0;
  transform: translate3d(var(--cx), var(--cy), 0);
  transition: opacity .6s var(--e-out);
  will-change: transform;
}
.has-pointer .atmos-cursor { opacity: 1; }

/* Cok hafif film grenligi — dijital duzligi kirar.
   mix-blend-mode KULLANILMIYOR: karisim modlari Android'de ek katman
   birlestirmesi zorlar ve dikdortgen cizim artefaktlarina yol acabiliyor.
   Ayni doku duz dusuk opaklikla elde ediliyor. */
.atmos-grain {
  inset: 0; z-index: -1; opacity: .035;
  background-image: radial-gradient(rgba(255,255,255,.9) .5px, transparent .5px);
  background-size: 3px 3px;
}


/* ==========================================================================
   07  UST ILERLEME CIZGISI
   ========================================================================== */

.progress { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 1200; pointer-events: none; }
.progress span {
  display: block; height: 100%; width: 100%;
  transform: scaleX(0); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  will-change: transform;
}


/* ==========================================================================
   08  HEADER VE MENU
   ========================================================================== */

.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding-block: 20px;
  border-bottom: 1px solid transparent;
  transition: padding .45s var(--e-soft), background .45s var(--e-out), border-color .45s var(--e-out);
}
.header.is-stuck {
  padding-block: 11px;
  background: rgba(3,4,10,.72);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border-bottom-color: var(--line);
}

.header-in { display: flex; align-items: center; justify-content: space-between; gap: 24px; }

/* ONEMLI: backdrop-filter tasiyan bir oge, icindeki position:fixed
   ogeler icin yeni bir referans kutusu yaratir. Menu acikken bu filtreyi
   kaldirmazsak panel tum ekran yerine header'in kutusuna hapsolur. */
body.nav-open .header {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border-bottom-color: transparent;
}

/* --- Logo --- */
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { display: block; line-height: 0; }

.mark .mark-lines path { stroke: var(--blue); transition: stroke .5s var(--e-out), opacity .5s var(--e-out); }
.mark .mark-p3 { opacity: .5; }
.mark .mark-src, .mark .mark-d2 { fill: var(--cyan); }
.mark .mark-d1 { fill: var(--blue); }
.mark .mark-d3 { fill: var(--blue); opacity: .5; transition: opacity .5s var(--e-out); }
.brand:hover .mark .mark-p3, .brand:hover .mark .mark-d3 { opacity: 1; }

.brand-text {
  font-size: 1.22rem; font-weight: 600; letter-spacing: -.04em; color: var(--text);
}

/* --- Menu --- */
.nav { display: flex; gap: 6px; }
.nav a {
  position: relative; display: block;
  padding: 10px 15px; border-radius: 999px;
  font-size: .9rem; color: var(--text-2);
  transition: color .3s var(--e-out), background .3s var(--e-out);
}
.nav a span { position: relative; z-index: 1; }
.nav a:hover { color: var(--text); background: var(--surf-1); }
.nav a.is-active { color: var(--text); }
/* Aktif bolum: altta kucuk bir spektrum noktasi */
.nav a.is-active::after {
  content: ""; position: absolute; left: 50%; bottom: 1px;
  width: 4px; height: 4px; margin-left: -2px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-a20);
}

/* --- Mobil menu butonu --- */
/* z-index: menu paneli acildiginda buton onun USTUNDE kalmali,
   yoksa kapatma carpisi panelin altinda kalir ve gorunmez. */
.nav-toggle {
  display: none; position: relative; z-index: 1100;
  width: 42px; height: 42px; border-radius: 10px;
}
.nav-toggle span {
  position: absolute; left: 11px; width: 20px; height: 1.5px;
  background: var(--text); border-radius: 2px;
  transition: transform .4s var(--e-soft);
}
.nav-toggle span:nth-child(1) { top: 18px; }
.nav-toggle span:nth-child(2) { top: 24px; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { transform: translateY(-3px) rotate(-45deg); }


/* ==========================================================================
   09  TASARIM SISTEMI — BUTONLAR, CIPLER, IKONLAR
   Sitedeki her tiklanabilir oge bu uc kaliptan birini kullanir.
   ========================================================================== */

.btn-row { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 42px; }
.btn-row-center { justify-content: center; }

.btn {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center;
  padding: 15px 30px; border-radius: 999px;
  font-size: .94rem; font-weight: 600; letter-spacing: -.012em;
  border: 1px solid transparent;
  transition: transform .45s var(--e-soft), border-color .35s var(--e-out), background .35s var(--e-out);
  will-change: transform;
}
.btn span { position: relative; z-index: 2; }
/* Uzerine gelince soldan saga gecen isik */
.btn::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(100deg, transparent 20%, rgba(255,255,255,.22) 50%, transparent 80%);
  transform: translateX(-110%);
  transition: transform .8s var(--e-soft);
}
.btn:hover { transform: translateY(-2px); }
.btn:hover::after { transform: translateX(110%); }
.btn:active { transform: translateY(0) scale(.985); transition-duration: .12s; }

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-lo) 55%, #1E68E8 100%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.28), 0 18px 40px -22px rgba(46,107,255,.9);
}
.btn-primary:hover { background: linear-gradient(135deg, #3B79FF 0%, #2258E4 55%, #2A74F5 100%); }

.btn-ghost {
  color: var(--text);
  background: rgba(14,18,32,.82);
  border-color: var(--line-2);
}
.btn-ghost:hover { background: rgba(22,28,46,.92); border-color: rgba(255,255,255,.24); }

/* --- Cip: kucuk secim butonu (simulator profilleri) --- */
.chip {
  padding: 7px 14px; border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--mono); font-size: .655rem;
  letter-spacing: .13em; text-transform: uppercase; color: var(--text-3);
  transition: color .3s var(--e-out), border-color .3s var(--e-out), background .3s var(--e-out);
}
.chip:hover { color: var(--text-2); border-color: var(--line-2); }
.chip.is-on {
  color: var(--text); border-color: rgba(46,107,255,.55); background: var(--blue-a12);
}

/* --- Ikon kabi: tum SVG ikonlar ayni kaba oturur --- */
.glyph {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; flex-shrink: 0;
  border-radius: 12px;
  color: var(--cyan);
  background: linear-gradient(160deg, var(--surf-2), var(--surf-1));
  border: 1px solid var(--line);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.07);
  transition: color .4s var(--e-out), border-color .4s var(--e-out), transform .5s var(--e-soft);
}
.glyph svg { width: 20px; height: 20px; }


/* ==========================================================================
   10  TASARIM SISTEMI — KART MATERYALI VE PANEL
   Kutu golgesi yok. Derinlik: ustte ic isik cizgisi, altta genis yumusak
   golge, uzerinde cam. Hover'da ust kenarda spektral sac teli belirir.
   ========================================================================== */

/* NEDEN BURADA backdrop-filter YOK — DOKUNMAYIN
   Kartlar bir <canvas> katmaninin ve arka plan katmanlarinin uzerinde durur.
   backdrop-filter bu kombinasyonda Android Chrome'da ekranin orneklenen
   bolgesini dikdortgen soluk bir blok olarak cizebiliyor.
   Zemin neredeyse duz siyah oldugu icin bulanikligin gorsel katkisi sifira
   yakindi; yerine tam opak bir taban kondu. Gorunum ayni, cizim guvenilir.
   Derinlik hissi ustteki ic isik cizgisi, ince kenar ve alttaki genis
   golgeden geliyor — bulaniklıktan degil.                                  */
.card, .panel {
  position: relative; overflow: hidden;
  isolation: isolate;
  border-radius: var(--r-md);
  background: linear-gradient(180deg, var(--surf-2), var(--surf-1)), #090C16;
  border: 1px solid var(--line);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 30px 60px -40px rgba(0,0,0,.95);
  transition: transform .55s var(--e-soft), border-color .45s var(--e-out), background .45s var(--e-out);
}

/* Spektral sac teli — imza detayi */
.card::before, .panel::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--blue), transparent);
  transform: scaleX(0); transform-origin: 0 50%;
  transition: transform .7s var(--e-soft);
}
.card:hover::before, .panel:hover::before { transform: scaleX(1); }
.card:hover {
  border-color: var(--line-2);
  background: linear-gradient(180deg, var(--surf-3), var(--surf-1)), #090C16;
}

/* Panel: baslikli, ayrilmis bolgeleri olan buyuk kart */
.panel-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 15px 20px; border-bottom: 1px solid var(--line);
}
.panel-live {
  width: 6px; height: 6px; border-radius: 50%; background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan-a20);
  animation: liveBlink 2.4s steps(1) infinite;
}
@keyframes liveBlink { 0%,62% { opacity: 1; } 63%,100% { opacity: .22; } }

.panel-foot {
  padding: 13px 20px; border-top: 1px solid var(--line);
  font-family: var(--mono); font-size: .69rem; letter-spacing: .02em; color: var(--text-3);
}


/* ==========================================================================
   11  BOLUM 1 — HERO
   ========================================================================== */

.hero {
  position: relative; isolation: isolate;
  padding-top: clamp(150px, 17vw, 240px);
  padding-bottom: var(--pad-hero);
  overflow: hidden;
}
.hero::before { display: none; }

/* Fareye duyarli canli ag — hero'nun tam arkasi */
.hero-mesh {
  position: absolute; inset: 0; z-index: -2;
  width: 100%; height: 100%;
}
/* Agin uzerine perde: metnin okunurlugunu garantiler */
.hero-veil {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(72% 58% at 26% 42%, rgba(3,4,10,.92) 0%, rgba(3,4,10,.55) 46%, transparent 78%),
    linear-gradient(180deg, transparent 62%, var(--void) 100%);
}

.hero-in {
  display: grid;
  /* Metin sutunu genis tutuluyor: baslik iki satirda kalsin diye. */
  grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
  gap: clamp(44px, 5vw, 76px);
  align-items: center;
}

.hero h1 { margin-bottom: 28px; }
.hero .lead { margin-bottom: 24px; }

.badge {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 16px 8px 12px; margin-bottom: 28px;
  border: 1px solid var(--line-2); border-radius: 999px;
  background: rgba(12,16,28,.86);
  font-family: var(--mono); font-size: .665rem;
  letter-spacing: .16em; text-transform: uppercase; color: var(--text-2);
}
.badge-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--cyan);
  box-shadow: 0 0 0 0 var(--cyan-a20);
  animation: badgePulse 2.8s var(--e-out) infinite;
}
@keyframes badgePulse {
  0%   { box-shadow: 0 0 0 0 rgba(34,211,238,.45); }
  70%  { box-shadow: 0 0 0 9px rgba(34,211,238,0); }
  100% { box-shadow: 0 0 0 0 rgba(34,211,238,0); }
}

/* --- Simulator --- */
.sim { padding-bottom: 0; }
.sim-stage { width: 100%; aspect-ratio: 1 / .78; padding: 8px 14px 0; }
.sim-stage svg { width: 100%; height: 100%; overflow: visible; }

.sim-edge  { stroke: rgba(255,255,255,.10); stroke-width: 1; fill: none; }
.sim-node  { fill: #10182B; stroke: rgba(255,255,255,.16); stroke-width: 1;
             transition: fill .55s var(--e-out), stroke .55s var(--e-out); }
/* Ara dugumler sistemin kararidir (soguk).
   Baslangic ve bitis ogrencinin kendisidir (sicak). */
.sim-node.on   { fill: var(--blue); stroke: var(--blue); }
.sim-node.head { fill: var(--warm); stroke: var(--warm); }
.sim-trace { stroke: var(--blue); stroke-width: 2; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.sim-glow  { stroke: var(--cyan); stroke-width: 6; fill: none; opacity: .14; stroke-linecap: round; stroke-linejoin: round; }

.sim-controls { display: flex; gap: 7px; flex-wrap: wrap; padding: 14px 20px 16px; }


/* Hero alt ucu: asagi kaydirma isareti */
.hero-cue {
  position: absolute; left: 50%; bottom: 34px; z-index: 1;
  width: 1px; height: 46px; margin-left: -.5px;
  background: linear-gradient(180deg, transparent, var(--line-2));
  overflow: hidden;
}
.hero-cue span {
  display: block; width: 1px; height: 14px;
  background: var(--cyan);
  animation: cueFall 2.6s var(--e-out) infinite;
}
@keyframes cueFall {
  0%   { transform: translateY(-16px); opacity: 0; }
  40%  { opacity: 1; }
  100% { transform: translateY(46px); opacity: 0; }
}


/* ==========================================================================
   12  BOLUM 2 — PROBLEM
   ========================================================================== */

.same-grid {
  display: grid; grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 12px; margin-top: clamp(48px, 5.5vw, 76px);
}
.same-card {
  display: flex; align-items: center; justify-content: center;
  padding: 38px 20px; text-align: center;
  border-radius: var(--r-sm);
}
.same-card .mono { font-size: .72rem; letter-spacing: .13em; transition: color .4s var(--e-out); }
.same-card:hover .mono { color: var(--text-2); }


/* ==========================================================================
   13  BOLUM 3 — VISION
   Sayfanin en sade ani. Gorsel yok, sadece tipografi ve bosluk.
   ========================================================================== */

.section-vision { padding-block: clamp(120px, 13vw, 190px); }
.vision-in { max-width: 940px; margin-inline: auto; text-align: center; }
.vision-in h2 { margin-bottom: 28px; }
.vision-in .lead { margin-bottom: 44px; }
.vision-in .measure { margin-inline: auto; }
.vision-in .body { margin-inline: auto; }


/* ==========================================================================
   14  BOLUM 4 — APPROACH
   ========================================================================== */

.split-visual { display: flex; justify-content: center; }
.cycle { width: 100%; max-width: 440px; }
.cycle-stage { width: 100%; aspect-ratio: 1 / 1; }
.cycle-stage svg { width: 100%; height: 100%; overflow: visible; }

.cyc-ring  { fill: none; stroke: var(--line); stroke-width: 1; }
.cyc-core  { fill: none; stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 6; }
.cyc-arc   { fill: none; stroke: var(--blue); stroke-width: 1.6; stroke-linecap: round; }
.cyc-dot   { fill: #10182B; stroke: rgba(255,255,255,.18); stroke-width: 1; cursor: pointer;
             transition: fill .5s var(--e-out), stroke .5s var(--e-out); }
.cyc-dot.on { fill: var(--blue); stroke: var(--blue); }
.cyc-txt   { font-family: var(--mono); font-size: 10.5px; fill: var(--text-3);
             cursor: pointer; transition: fill .5s var(--e-out); letter-spacing: .1em; }
.cyc-txt.on { fill: var(--cyan); }
.cyc-trav  { fill: var(--cyan); }
.cyc-label { font-family: var(--font); letter-spacing: -.025em; }

.cycle-read { margin-top: 16px; text-align: center; font-size: .68rem; min-height: 1.6em; }


/* ==========================================================================
   15  BOLUM 5 — TECHNOLOGY
   ========================================================================== */

.layers { display: grid; gap: 10px; }

.layer {
  position: relative;
  display: grid; grid-template-columns: 54px 44px minmax(0,1fr);
  align-items: start; gap: 18px;
  padding: 26px 28px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  transition: background .45s var(--e-out), border-color .45s var(--e-out), transform .5s var(--e-soft);
}
.layer:hover {
  background: var(--surf-1); border-color: var(--line);
  transform: translateX(5px);
}
.layer:hover .glyph { color: var(--text); border-color: rgba(46,107,255,.4); transform: scale(1.05); }

.layer-no { padding-top: 13px; font-size: .68rem; }
.layer-body h3 { margin-bottom: 9px; }
.layer-body p { color: var(--text-2); max-width: 60ch; font-size: .925rem; line-height: 1.68; }

/* --- Telemetri paneli: SAYFANIN TEK TAM GENISLIK ANI ---------------------
   Sayfanin tamami 1220px'lik bir kap icindedir. Burada, "en cok veriye sahip
   olan biziz" iddiasinin tam durdugu yerde, o kap bilerek kirilir. Veri
   ekranin iki kenarindan tasar.
   --vw degiskenini main.js gunceller (kaydirma cubugu haric gercek genislik).
   ----------------------------------------------------------------------- */
.stream {
  margin-top: clamp(44px, 5vw, 68px);
  margin-inline: calc((100% - var(--vw)) / 2);
  border-inline: 0;
  border-radius: 0;
}
/* Baslik ve dipnot, sayfanin geri kalaniyla ayni hizada kalir */
.stream .panel-head, .stream .panel-foot {
  padding-inline: max(22px, calc((var(--vw) - var(--wrap)) / 2));
}
/* Veri akisi kenarlarda erir: cercevenin disina tasiyor hissi */
.stream-body {
  display: grid; grid-template-columns: minmax(0,1.3fr) minmax(0,1fr);
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 4%, #000 96%, transparent 100%);
          mask-image: linear-gradient(90deg, transparent 0, #000 4%, #000 96%, transparent 100%);
}

.stream-log {
  padding: 18px 22px 18px max(22px, calc((var(--vw) - var(--wrap)) / 2));
  height: 210px; overflow: hidden;
  border-right: 1px solid var(--line);
  font-family: var(--mono); font-size: .705rem; line-height: 2.05;
  color: var(--text-3);
}
.stream-log b { color: var(--warm); font-weight: 400; }
.stream-log i { color: var(--text-2); font-style: normal; }
.stream-line { opacity: 0; transform: translateY(7px); animation: lineIn .55s var(--e-soft) forwards; }
@keyframes lineIn { to { opacity: 1; transform: none; } }

.stream-wave { padding: 18px max(22px, calc((var(--vw) - var(--wrap)) / 2)) 18px 22px; height: 210px; }
.stream-wave canvas { width: 100%; height: 100%; }


/* ==========================================================================
   16  BOLUM 6 — SCIENCE
   Kart degil sutun: ince dikey ayraclarla bolunmus bes kolon.
   ========================================================================== */

.pillars {
  display: grid; grid-template-columns: repeat(5, minmax(0,1fr));
  margin-top: clamp(48px, 5.5vw, 80px);
  border-top: 1px solid var(--line);
}
.pillar {
  padding: 34px 22px 6px; border-right: 1px solid var(--line);
  transition: background .45s var(--e-out);
}
.pillar:first-child { padding-left: 0; }
.pillar:last-child  { border-right: 0; padding-right: 0; }
.pillar:hover .glyph { color: var(--text); border-color: rgba(46,107,255,.4); }
.pillar .glyph { margin-bottom: 20px; }
.pillar h3 { margin-bottom: 11px; }
.pillar p { font-size: .895rem; line-height: 1.64; color: var(--text-2); }


/* ==========================================================================
   17  BOLUM 7 — VALIDATION
   ========================================================================== */

.timeline {
  position: relative;
  display: grid; grid-template-columns: repeat(6, minmax(0,1fr));
  margin-top: clamp(56px, 6.5vw, 92px);
}
.timeline::before {
  content: ""; position: absolute; top: 7px; left: 8.33%; right: 8.33%; height: 1px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--blue) 42%, var(--line-2) 46%, var(--line-2) 100%);
}
.tl-step { position: relative; text-align: center; }
.tl-dot {
  position: relative; z-index: 2; display: block;
  width: 15px; height: 15px; margin: 0 auto 18px;
  border-radius: 50%; background: var(--void); border: 1px solid var(--line-2);
}
.tl-step.is-done .tl-dot { background: var(--cyan); border-color: var(--cyan); }
.tl-step.is-active .tl-dot {
  background: var(--blue); border-color: var(--blue);
  animation: tlRing 2.6s var(--e-out) infinite;
}
@keyframes tlRing {
  0%   { box-shadow: 0 0 0 0 rgba(46,107,255,.5); }
  70%  { box-shadow: 0 0 0 13px rgba(46,107,255,0); }
  100% { box-shadow: 0 0 0 0 rgba(46,107,255,0); }
}
.tl-label { display: block; padding-inline: 5px; font-size: .68rem; letter-spacing: .12em; }
.tl-step.is-done .tl-label, .tl-step.is-active .tl-label { color: var(--text); }
.tl-step.is-next .tl-label { color: var(--text-3); }


/* ==========================================================================
   18  BOLUM 8 — FOUNDER
   ========================================================================== */

.founder {
  display: grid; grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
  gap: clamp(44px, 5.5vw, 84px); align-items: center;
}
.founder-photo { position: relative; }
.founder-photo::before {
  content: ""; position: absolute; inset: -12%;
  background: radial-gradient(closest-side, rgba(46,107,255,.26), transparent 70%);
  filter: blur(26px);
}
.founder-photo img {
  position: relative;
  width: 100%; aspect-ratio: 9 / 10; object-fit: cover; object-position: 50% 22%;
  border-radius: var(--r-lg); border: 1px solid var(--line-2);
}
.founder-name {
  font-size: 1.3rem; font-weight: 600; letter-spacing: -.028em;
  color: var(--text); margin-bottom: 14px;
}
.fcards {
  display: grid; grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 10px; margin-top: 40px;
}
.fcard { padding: 22px 20px; border-radius: var(--r-sm); }
.fcard strong {
  display: block; margin-bottom: 6px;
  font-size: .98rem; font-weight: 600; letter-spacing: -.02em; color: var(--text);
}
.fcard .mono { font-size: .645rem; letter-spacing: .12em; }


/* ==========================================================================
   19  BOLUM 9 — CONTACT
   Sayfanin en yogun isik ani.
   ========================================================================== */

.section-call { position: relative; overflow: hidden; padding-block: var(--pad-cta); }

.call-aura {
  position: absolute; left: 50%; top: 42%; z-index: 0;
  width: min(1000px, 130vw); height: min(760px, 100vh);
  transform: translate3d(-50%, -50%, 0);
  background:
    radial-gradient(closest-side, rgba(46,107,255,.22), transparent 68%),
    radial-gradient(closest-side, rgba(34,211,238,.09), transparent 70%);
  filter: blur(46px);
}
.call-mark {
  position: absolute; left: 50%; top: 50%; z-index: 0;
  transform: translate3d(-50%, -50%, 0);
  opacity: .045;
  -webkit-mask-image: radial-gradient(closest-side, #000 28%, transparent 76%);
          mask-image: radial-gradient(closest-side, #000 28%, transparent 76%);
}
.call-mark .mark { width: min(820px, 140vw); height: auto; }

.call-in { position: relative; z-index: 1; text-align: center; max-width: 1000px; }
.call-in h2 { margin-bottom: 28px; }
.call-in .lead { margin-bottom: 26px; }
.call-in .body { margin-inline: auto; }


/* ==========================================================================
   20  FOOTER
   ========================================================================== */

.footer { position: relative; padding-top: 82px; border-top: 1px solid var(--line); }

.footer-top {
  display: grid; grid-template-columns: minmax(0,1.5fr) minmax(0,1fr) minmax(0,1fr);
  gap: 44px; padding-bottom: 66px;
}
.footer-id p { margin-top: 16px; max-width: 28ch; font-size: .93rem; color: var(--text-3); }

.footer-col { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; }
.footer-col-head { margin-bottom: 10px; }
/* padding + negatif margin: gorsel ritim aynı kalir ama dokunma alani
   26px'ten 44px'e cikar. Telefonda parmakla isabet ettirmek kolaylasir. */
.footer-col a {
  position: relative; font-size: .93rem; color: var(--text-2);
  padding-block: 9px; margin-block: -4px;
  transition: color .3s var(--e-out), transform .4s var(--e-soft);
}
.footer-col a:hover { color: var(--text); transform: translateX(3px); }
.footer-loc { font-size: .93rem; color: var(--text-3); }

/* Devasa konturlu kelime markasi */
.footer-wordmark {
  display: flex; justify-content: center;
  padding-bottom: 8px; overflow: hidden;
  -webkit-mask-image: linear-gradient(180deg, #000 8%, transparent 92%);
          mask-image: linear-gradient(180deg, #000 8%, transparent 92%);
}
.footer-wordmark span {
  font-size: clamp(4.4rem, 17.5vw, 15rem);
  font-weight: 700; line-height: .84; letter-spacing: -.055em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255,255,255,.11);
  user-select: none;
}

.footer-base { padding-block: 24px; border-top: 1px solid var(--line); text-align: center; }
.footer-base .mono { font-size: .66rem; letter-spacing: .12em; }


/* ==========================================================================
   21  BELIRME ANIMASYONLARI
   .reveal sinifini main.js yonetir.
   ========================================================================== */

.js .reveal {
  opacity: 0;
  transform: translate3d(0, 26px, 0);
  transition: opacity .9s var(--e-soft), transform .9s var(--e-soft);
  will-change: opacity, transform;
}
.js .reveal.is-in { opacity: 1; transform: none; will-change: auto; }

/* Grup icindeki kartlar sirayla belirir (gecikmeyi JS verir) */
.same-grid .reveal.is-in,
.pillars   .reveal.is-in,
.fcards    .reveal.is-in,
.hero-text .reveal.is-in,
.layers    .reveal.is-in { transition-delay: var(--d, 0ms); }


/* ==========================================================================
   22  MOBIL UYUM
   ========================================================================== */

@media (max-width: 1080px) {
  .hero-in, .split, .founder { grid-template-columns: minmax(0,1fr); }
  .hero-visual, .founder-photo { width: 100%; max-width: 500px; margin-inline: auto; }

  /* Kurucu bolumunde portre once gelir. */
  .founder-photo { order: -1; }

  /* Hero'da METIN once gelir.
     Simulator yukarida olursa baslik ilk ekranin altina dusuyor ve
     telefonla gelen ziyaretci ne yaptigimizi okumadan kaydirmak zorunda
     kaliyor. Simulatoru basligin hemen ardina aliyoruz.
     Geri almak isterseniz: .hero-visual{order:-1} yeter. */
  .hero-visual { order: 0; }
  .lead { max-width: 46ch; }
  .pillars { grid-template-columns: repeat(2, minmax(0,1fr)); border-top: 0; gap: 10px; }
  .pillar {
    border-right: 0; border: 1px solid var(--line);
    border-radius: var(--r-sm); padding: 28px 22px 22px;
  }
  .pillar:first-child, .pillar:last-child { padding-inline: 22px; }
  .footer-top { grid-template-columns: minmax(0,1fr) minmax(0,1fr); }
  .footer-id { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }

  /* Kucuk ekranda izgara daha genis ve daha soluk: dar alanda
     desen olarak degil, doku olarak okunur. */
  .atmos-grid { background-size: 104px 104px; opacity: .42; }

  /* Mobilde hero agi statik cizilir; perdeyi biraz guclendirerek
     metnin arkasinin her koşulda sakin kalmasini garanti ediyoruz. */
  .hero-veil { background:
    radial-gradient(90% 62% at 50% 46%, rgba(3,4,10,.90) 0%, rgba(3,4,10,.62) 52%, transparent 84%),
    linear-gradient(180deg, transparent 58%, var(--void) 100%); }
  .wrap { width: min(100% - 34px, var(--wrap)); }

  /* Menu tam ekran panele donusur */
  .nav-toggle { display: block; }
  .nav {
    position: fixed; inset: 0; z-index: 900;
    flex-direction: column; align-items: center; gap: 6px;
    /* safe center: ekran kisa oldugunda ustteki baglantilar kirpilmaz */
    justify-content: center;
    justify-content: safe center;
    padding: 90px 22px 44px;
    overflow-y: auto;
    background: #03040A;
    opacity: 0; visibility: hidden;
    transition: opacity .4s var(--e-out), visibility .4s;
  }
  .nav.is-open { opacity: 1; visibility: visible; }
  .nav a { font-size: 1.5rem; font-weight: 600; letter-spacing: -.03em; padding: 12px 22px; }
  .nav a.is-active::after { display: none; }

  .hero { padding-top: 128px; }
  .hero-cue { display: none; }

  .same-grid { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; }
  .same-card { padding: 28px 14px; }

  .pillars { grid-template-columns: minmax(0,1fr); }

  .layer { grid-template-columns: 44px minmax(0,1fr); gap: 14px 16px; padding: 22px 20px; }
  .layer-no { padding-top: 12px; }
  .layer .glyph { grid-row: 1; }
  .layer-body { grid-column: 1 / -1; }
  .layer:hover { transform: none; }

  .stream-body { grid-template-columns: minmax(0,1fr); }
  .stream-log {
    border-right: 0; border-bottom: 1px solid var(--line);
    height: 172px; padding: 15px 18px;
  }
  .stream-wave { height: 120px; padding: 15px 18px; }
  .stream .panel-head, .stream .panel-foot { padding-inline: 18px; }

  .timeline { grid-template-columns: minmax(0,1fr); gap: 20px; }
  .timeline::before {
    top: 6px; bottom: 6px; left: 7px; right: auto; width: 1px; height: auto;
    background: linear-gradient(180deg, var(--cyan) 0%, var(--blue) 42%, var(--line-2) 46%, var(--line-2) 100%);
  }
  .tl-step { display: flex; align-items: center; gap: 15px; text-align: left; }
  .tl-dot { margin: 0; flex-shrink: 0; }
  .tl-label { padding-inline: 0; }

  .fcards { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-top { grid-template-columns: minmax(0,1fr); gap: 36px; }
  .btn-row .btn { flex: 1 1 auto; }
}

@media (max-width: 420px) {
  .same-grid, .fcards { grid-template-columns: minmax(0,1fr); }
}


/* ==========================================================================
   23  HAREKET AZALTMA TERCIHI
   Isletim sisteminde "hareketi azalt" acikken her sey durur.
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .atmos-cursor, .hero-cue { display: none; }
}