/* Reaksiyon Yazılım & Ar-Ge — tanıtım sitesi
   Renkler ve yazı tipleri önceki (WordPress) siteden: siyah, beyaz, açık gri, #333 metin, sarı vurgu;
   başlıklar Montserrat, metinler Open Sans. */
:root {
  --siyah: #000000;
  --siyah-2: #0b0b0b;
  --beyaz: #ffffff;
  --gri-zemin: #f6f6f6;
  --yazi: #333333;
  --yazi-soluk: #555555;
  --acik-yazi: #ffffff;
  --acik-soluk: #c4c4c4;
  --sari: #fbc02d;
  --sari-koyu: #e5a913;
  --cizgi: #e6e6e6;
  --cizgi-koyu: rgba(255, 255, 255, .12);

  --baslik: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  --govde: "Open Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;

  --kap: 1160px;
  --yumusak: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--beyaz);
  color: var(--yazi);
  font-family: var(--govde);
  font-weight: 300;
  font-size: 17.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--baslik); margin: 0; }
p { margin: 0 0 1em; }
strong { font-weight: 600; }

.kap { width: 100%; max-width: var(--kap); margin: 0 auto; padding: 0 28px; }
@media (max-width: 560px) { .kap { padding: 0 16px; } body { font-size: 16.5px; } }

/* ---------- Üst çubuk ---------- */
.ust {
  position: fixed; inset: 0 0 auto; z-index: 50; color: var(--acik-yazi);
  border-bottom: 1px solid transparent;
  transition: background .35s var(--yumusak), border-color .35s, backdrop-filter .35s;
}
.ust.kaydi {
  background: rgba(0, 0, 0, .86);
  -webkit-backdrop-filter: saturate(140%) blur(12px); backdrop-filter: saturate(140%) blur(12px);
  border-color: var(--cizgi-koyu);
}
.ust-ic { display: flex; align-items: center; justify-content: space-between; height: 74px; }
.marka { text-decoration: none; }
.marka-yazi {
  font-family: var(--baslik); font-weight: 600; font-size: 15px; letter-spacing: 2px;
  text-transform: uppercase; white-space: nowrap;
}
.marka-ve { color: var(--sari); }
.menu { display: flex; align-items: center; gap: 32px; }
.menu a {
  position: relative; text-decoration: none;
  font-family: var(--baslik); font-weight: 500; font-size: 12.5px; letter-spacing: 1.5px; text-transform: uppercase;
  color: rgba(255, 255, 255, .78); transition: color .25s;
}
.menu a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -7px; height: 2px; background: var(--sari);
  transform: scaleX(0); transform-origin: left; transition: transform .35s var(--yumusak);
}
.menu a:hover, .menu a:focus-visible { color: var(--beyaz); }
.menu a:hover::after, .menu a:focus-visible::after { transform: scaleX(1); }
.menu .menu-vurgu { color: var(--siyah); background: var(--sari); padding: 10px 20px; border-radius: 2px; font-weight: 600; }
.menu .menu-vurgu::after { display: none; }
.menu .menu-vurgu:hover, .menu .menu-vurgu:focus-visible { background: var(--beyaz); color: var(--siyah); }
@media (max-width: 820px) { .menu a:not(.menu-vurgu) { display: none; } }
@media (max-width: 420px) { .marka-yazi { font-size: 12.5px; letter-spacing: 1.5px; } .menu .menu-vurgu { padding: 9px 14px; } }

/* ---------- Giriş ---------- */
.giris {
  position: relative; min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center; overflow: hidden;
  background: var(--siyah); color: var(--acik-yazi);
}
.giris-arka {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(56rem 36rem at 88% 12%, rgba(251, 192, 45, .13), transparent 62%),
    radial-gradient(46rem 32rem at 0% 100%, rgba(255, 255, 255, .06), transparent 62%);
}
.giris-arka::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: calc(100% / 12) 100%;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
          mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
}
.giris-arka::after {
  content: "R"; position: absolute; right: -4vw; bottom: -13vw;
  font-family: var(--baslik); font-weight: 800; font-size: 58vw; line-height: 1;
  /* Kontur yerine silik dolgu: değişken yazı tipinin iç konturları görünmesin */
  color: rgba(251, 192, 45, .06);
}
.giris-ic { position: relative; padding-top: 120px; padding-bottom: 120px; }
.ust-baslik {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--baslik); font-weight: 600; font-size: 12.5px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--sari);
}
.ust-baslik::before { content: ""; width: 40px; height: 2px; background: var(--sari); }
.giris h1 {
  max-width: 16ch; margin: 22px 0 28px;
  font-weight: 800; font-size: clamp(2.5rem, 6.2vw, 4.9rem); line-height: 1.08; letter-spacing: -.02em;
}
.giris h1 em { font-style: normal; color: var(--sari); }
.giris-metin { max-width: 54ch; font-size: clamp(1.02rem, 1.6vw, 1.15rem); color: var(--acik-soluk); }
.dugmeler { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 40px; }
.dugme {
  display: inline-flex; align-items: center; padding: 16px 28px; border-radius: 2px; text-decoration: none;
  font-family: var(--baslik); font-weight: 600; font-size: 12.5px; letter-spacing: 1.5px; text-transform: uppercase;
  transition: background .3s var(--yumusak), color .3s, border-color .3s, transform .3s var(--yumusak);
}
.dugme:hover { transform: translateY(-1px); }
.dugme-dolu { background: var(--sari); color: var(--siyah); }
.dugme-dolu:hover, .dugme-dolu:focus-visible { background: var(--beyaz); }
.dugme-cizgi { border: 1px solid rgba(255, 255, 255, .35); color: var(--beyaz); }
.dugme-cizgi:hover, .dugme-cizgi:focus-visible { border-color: var(--sari); color: var(--sari); }
.asagi {
  position: absolute; left: 50%; bottom: 34px; width: 24px; height: 40px; margin-left: -12px;
  border: 1px solid rgba(255, 255, 255, .3); border-radius: 14px;
}
.asagi span {
  position: absolute; left: 50%; top: 8px; width: 2px; height: 8px; margin-left: -1px; border-radius: 2px;
  background: var(--sari); animation: kaydir 2.2s var(--yumusak) infinite;
}
@keyframes kaydir { 0% { opacity: 0; transform: translateY(0); } 30% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }
@media (max-height: 640px) { .asagi { display: none; } }

/* ---------- Bölümler ---------- */
.bolum { padding: clamp(84px, 11vw, 140px) 0; }
.bolum-koyu { background: var(--siyah); color: var(--acik-yazi); }
.bolum-gri { background: var(--gri-zemin); }
.etiket {
  display: flex; align-items: center; gap: 12px; margin-bottom: 20px;
  font-family: var(--baslik); font-weight: 600; font-size: 13px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--yazi);
}
.etiket::before { content: ""; width: 30px; height: 2px; background: var(--sari); }
.bolum-koyu .etiket { color: var(--sari); }
h2 { font-weight: 300; font-size: clamp(2rem, 3.8vw, 2.75rem); line-height: 1.2; letter-spacing: -.01em; }
.ince { color: var(--yazi-soluk); margin-top: 22px; max-width: 46ch; }
.bolum-koyu .ince { color: var(--acik-soluk); }
.bolum-bas { max-width: 720px; margin-bottom: clamp(46px, 6vw, 70px); }

.iki-sutun { display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(40px, 8vw, 120px); align-items: start; }
@media (min-width: 861px) { .iki-sutun > :first-child { position: sticky; top: 130px; } }
@media (max-width: 860px) { .iki-sutun { grid-template-columns: 1fr; } }
.metin p { color: var(--yazi); }
.metin p:first-child {
  font-family: var(--baslik); font-weight: 300; font-size: 1.32em; line-height: 1.55; color: var(--yazi);
  padding-left: 22px; border-left: 2px solid var(--sari);
}

/* Hizmet kartları */
.kartlar { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 860px) { .kartlar { grid-template-columns: 1fr; } }
.kart {
  position: relative; padding: clamp(30px, 4vw, 48px); background: var(--beyaz);
  border: 1px solid var(--cizgi); border-top: 3px solid var(--sari);
  box-shadow: 0 1px 2px rgba(0, 0, 0, .04);
  transition: box-shadow .4s var(--yumusak), transform .4s var(--yumusak);
}
.kart:hover { transform: translateY(-3px); box-shadow: 0 18px 40px -22px rgba(0, 0, 0, .28); }
.kart-no { font-family: var(--baslik); font-weight: 700; font-size: 14px; letter-spacing: 2px; color: var(--sari-koyu); }
.kart h3 { font-weight: 400; font-size: clamp(1.45rem, 2.3vw, 1.85rem); line-height: 1.25; margin: 16px 0 20px; color: var(--yazi); }
.kart p { color: var(--yazi-soluk); }
.kart p:last-child { margin-bottom: 0; }

/* Ödüller */
.oduller { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--cizgi); }
.oduller li {
  display: flex; justify-content: space-between; align-items: baseline; gap: 24px;
  padding: 22px 0; border-bottom: 1px solid var(--cizgi);
}
.oduller strong { font-family: var(--baslik); font-weight: 600; font-size: 1.08rem; line-height: 1.4; color: var(--yazi); }
.oduller span {
  flex: none; display: inline-flex; align-items: center; gap: 10px; white-space: nowrap;
  font-family: var(--baslik); font-weight: 500; font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--yazi-soluk);
}
.oduller span::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--sari); }
@media (max-width: 560px) {
  .oduller li { flex-direction: column; gap: 6px; }
  .oduller span { white-space: normal; }
}

/* İletişim */
.iletisim { position: relative; overflow: hidden; }
.iletisim::before {
  content: ""; position: absolute; right: -20rem; bottom: -30rem; width: 60rem; height: 60rem; pointer-events: none;
  background: radial-gradient(closest-side, rgba(251, 192, 45, .10), transparent);
}
.iletisim .kap { position: relative; }
.iletisim-kutular { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 860px) { .iletisim-kutular { grid-template-columns: 1fr; } }
.iletisim-kutu {
  display: flex; flex-direction: column; gap: 6px; padding: 30px 30px 32px; text-decoration: none;
  border: 1px solid var(--cizgi-koyu); transition: border-color .35s var(--yumusak), background .35s;
}
a.iletisim-kutu:hover, a.iletisim-kutu:focus-visible { border-color: var(--sari); background: rgba(255, 255, 255, .03); }
.iletisim-kutu svg {
  width: 26px; height: 26px; margin-bottom: 18px;
  fill: none; stroke: var(--sari); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
}
.kutu-ad { font-family: var(--baslik); font-weight: 600; font-size: 12px; letter-spacing: 2px; text-transform: uppercase; color: var(--acik-soluk); }
.kutu-deger { font-family: var(--baslik); font-weight: 400; font-size: 1.25rem; color: var(--beyaz); overflow-wrap: anywhere; }

/* Alt bilgi */
.alt { background: var(--siyah); color: var(--acik-soluk); border-top: 1px solid var(--cizgi-koyu); font-size: 14px; }
.alt-ic { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 14px; padding-top: 28px; padding-bottom: 28px; }
.marka-kucuk { font-family: var(--baslik); font-weight: 600; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; color: var(--beyaz); }

/* Belirme: yalnız JavaScript çalışıyorsa gizlenir; çalışmazsa içerik doğrudan görünür */
.js .belir { opacity: 0; transform: translateY(18px); transition: opacity .9s var(--yumusak), transform .9s var(--yumusak); }
.js .belir.gorundu { opacity: 1; transform: none; }

:focus-visible { outline: 2px solid var(--sari); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .belir { opacity: 1; transform: none; transition: none; }
  .asagi span { animation: none; }
  .kart, .dugme { transition: none; }
}