/* ==========================================================================
   KNT Yapı Mimarlık — landing.css
   Açılış ekranı. İki iş kolu, iki ayrı kimlik:
   · İnşaat  → koyu, beton ve çelik; şantiye fotoğrafı, vinç çizimi, geniş grotesk
   · Mimarlık → açık, çizim kâğıdı; kemer pencere, altın oran, serif italik
   Ortadaki dikiş (seam) imleçle kayar; --seam değeri landing.js'ten gelir.
   ========================================================================== */

body.is-landing { background: #0b0c0b; }
body.is-landing .to-top,
body.is-landing .scroll-progress { display: none; }

/* ==========================================================================
   Üst menü — mix-blend-mode ile koyu ve açık zeminde kendiliğinden tersine döner
   ========================================================================== */
.lhead {
  position: fixed; inset: 0 0 auto; z-index: 120;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: clamp(16px, 2.2vw, 28px) clamp(20px, 4vw, 64px);
  color: #fff;
  mix-blend-mode: difference;
  pointer-events: none;
}
.lhead > * { pointer-events: auto; }
.js .lhead { opacity: 0; transform: translateY(-16px); }
.is-ready .lhead { opacity: 1; transform: none; transition: opacity 1s var(--ease-out) 1.2s, transform 1.2s var(--ease-out) 1.2s; }

.lhead__logo { display: flex; align-items: center; gap: 12px; color: inherit; }
.lhead__logo svg { width: 62px; height: auto; }
.lhead__logo-text strong {
  display: block; font-family: var(--font-display); font-size: 12.5px; font-weight: 700;
  letter-spacing: .18em; text-transform: uppercase; line-height: 1.2;
}
.lhead__logo-text small {
  display: block; margin-top: 3px; font-size: 9.5px; letter-spacing: .2em;
  text-transform: uppercase; opacity: .6;
}

.lhead__nav { display: flex; gap: clamp(16px, 2.1vw, 36px); }
.lhead__nav a {
  position: relative; padding: 6px 0;
  font-family: var(--font-display); font-size: 13px; font-weight: 600; letter-spacing: .02em;
}
.lhead__nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: right; transition: transform .5s var(--ease-out);
}
.lhead__nav a:hover::after, .lhead__nav a:focus-visible::after { transform: scaleX(1); transform-origin: left; }

.lhead__actions { display: flex; align-items: center; gap: 18px; }
.lhead__phone { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; }
.lhead__phone .i { font-size: 15px; }
.lhead__cta {
  display: inline-flex; align-items: center; gap: 9px; padding: 12px 20px; border-radius: 999px;
  background: #fff; color: #000; font-size: 13px; font-weight: 700;
  transition: transform .45s var(--ease-out);
}
.lhead__cta .i { transition: transform .45s var(--ease-out); }
.lhead__cta:hover .i { transform: rotate(45deg); }

/* ==========================================================================
   Sahne
   ========================================================================== */
.duo {
  --seam: 50;
  --kb: clamp(.78, calc(.78 + (var(--seam) - 36) * .00786), 1);
  --kd: clamp(.78, calc(.78 + (64 - var(--seam)) * .00786), 1);
  --cream: #eee8dc;
  --char: #17150f;
  --gold: #b08850;
  --gold-deep: #7b5a28;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --pad: clamp(20px, 4vw, 64px);
  position: relative; isolation: isolate;
  height: 100vh; height: 100svh; min-height: 600px;
  overflow: hidden;
  background: #0b0c0b; color: #fff;
}

/* ---------------------------------------------------------------- İki taraf
   Her taraf tam genişlikte bir kutu; dikişe göre kaydırılır, içindeki "stage"
   ters yönde kaydırılarak ekran koordinatında sabit kalır. Yalnızca transform. */
.duo__side {
  position: absolute; inset: 0; z-index: 1;
  display: block; overflow: hidden; color: inherit;
  -webkit-tap-highlight-color: transparent;
}
.duo__side--build { transform: translate3d(calc((var(--seam) - 100) * 1%), 0, 0); }
.duo__side--design { transform: translate3d(calc(var(--seam) * 1%), 0, 0); color: var(--char); }
.duo__stage { position: absolute; inset: 0; }
.duo__side--build .duo__stage { transform: translate3d(calc((100 - var(--seam)) * 1%), 0, 0); }
.duo__side--design .duo__stage { transform: translate3d(calc(var(--seam) * -1%), 0, 0); }
.duo__side:focus-visible { outline: none; }
.duo__side:focus-visible .duo__cta { outline: 2px solid var(--accent); outline-offset: 6px; }

.js .duo__side--build { clip-path: inset(0 0 0 100%); }
.js .duo__side--design { clip-path: inset(0 100% 0 0); }
.is-ready .duo__side { clip-path: inset(0 0 0 0); transition: clip-path 1.5s var(--ease-io) .3s; }
.is-ready .duo.is-settled .duo__side { clip-path: none; }

/* ==========================================================================
   İNŞAAT — beton, çelik, şantiye
   ========================================================================== */
.duo__media {
  position: absolute; inset: 0; overflow: hidden; background: #111311;
  transform: translate3d(calc((var(--seam) / 2 - 50) * 1%), 0, 0);
}
.duo__img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; object-position: 50% 42%;
  transform: scale(1.06);
  transition: filter 1.1s var(--ease-out), transform 1.8s var(--ease-out);
}
.duo__side--build .duo__img:not(.duo__img--lens) { filter: grayscale(1) contrast(1.14) brightness(.42); }
.duo__tint {
  position: absolute; inset: 0; background: var(--accent);
  mix-blend-mode: color; opacity: .3; transition: opacity 1s var(--ease-out);
}
.duo__img--lens { filter: saturate(1.1) contrast(1.05) brightness(.9); clip-path: circle(0 at 50% 50%); }

/* Işık merceği: imleci izleyen halka + ölçü çentikleri */
.duo__lens {
  position: absolute; left: 0; top: 0; width: 300px; height: 300px; margin: -150px 0 0 -150px;
  border-radius: 50%; border: 1px solid color-mix(in srgb, var(--accent) 80%, transparent);
  transform: translate3d(var(--lx, 50vw), var(--ly, 50vh), 0) scale(var(--ls, 0));
  pointer-events: none;
}
.duo__lens::before, .duo__lens::after, .duo__lens i::before, .duo__lens i::after {
  content: ""; position: absolute; background: var(--accent);
}
.duo__lens::before { left: 50%; top: -9px; width: 1px; height: 18px; }
.duo__lens::after { left: 50%; bottom: -9px; width: 1px; height: 18px; }
.duo__lens i::before { top: 50%; left: -9px; width: 18px; height: 1px; }
.duo__lens i::after { top: 50%; right: -9px; width: 18px; height: 1px; }

.duo__shade {
  position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(to top, rgba(8, 9, 8, .94) 0%, rgba(8, 9, 8, .55) 30%, rgba(8, 9, 8, 0) 58%),
    linear-gradient(to bottom, rgba(8, 9, 8, .72) 0%, rgba(8, 9, 8, 0) 32%);
}
/* Taşıyıcı sistem ızgarası: aks çizgileri + kat hatları */
.duo__grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, .07) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 12.5% 100%, 100% 12.5vh;
  -webkit-mask-image: linear-gradient(to bottom, transparent 4%, #000 26%, #000 72%, transparent 96%);
          mask-image: linear-gradient(to bottom, transparent 4%, #000 26%, #000 72%, transparent 96%);
}

.duo[data-active="a"] .duo__side--build .duo__img:not(.duo__img--lens) { filter: grayscale(.4) contrast(1.08) brightness(.52); }
.duo[data-active="a"] .duo__side--build .duo__img { transform: scale(1.1); }
.duo[data-active="a"] .duo__tint { opacity: .14; }
.duo[data-active="b"] .duo__side--build .duo__img:not(.duo__img--lens) { filter: grayscale(1) contrast(1.1) brightness(.3); }

/* ---------------------------------------------------------------- Vinç + yükselen yapı */
.duo__crane {
  position: absolute; left: clamp(20px, 4.6vw, 80px); top: 21%;
  width: min(26vw, 430px); max-width: none; height: auto; overflow: visible; pointer-events: none;
  color: rgba(255, 255, 255, .6);
  transform: scale(var(--kb)); transform-origin: 0 0;
  transition: color .8s, opacity .8s;
}
.duo[data-active="a"] .duo__crane { color: rgba(255, 255, 255, .92); }
.duo[data-active="b"] .duo__crane { opacity: .4; }
.duo__crane path, .duo__crane rect { vector-effect: non-scaling-stroke; }
.duo__crane .thin { stroke-width: .8; opacity: .65; }
.duo__crane .fill { fill: currentColor; fill-opacity: .16; }
.duo__crane .dl, .duo__crane .fl { stroke-dasharray: 1; stroke-dashoffset: 1; }
.is-ready .duo__crane .dl { stroke-dashoffset: 0; transition: stroke-dashoffset 1.7s var(--ease-io) calc(1.1s + var(--dd, 0s)); }
.duo__crane .fl { opacity: 0; }
.duo__crane-move { color: var(--accent); opacity: 0; transform: translateX(170px); }
.duo__crane-cable { fill: currentColor; stroke: none; transform-box: fill-box; transform-origin: 50% 0; transform: scaleY(3.03); }
.duo__crane-hook { transform: translateY(203px); }
.duo__crane-load { fill: currentColor; fill-opacity: .35; }
.is-ready .duo__crane-move { opacity: 1; transition: opacity .8s 2.6s; animation: craneX 8s 2.6s infinite; }
.is-ready .duo__crane-cable { animation: craneCable 8s 2.6s infinite; }
.is-ready .duo__crane-hook { animation: craneHook 8s 2.6s infinite; }
.is-ready .duo__crane-load { animation: craneLoad 8s 2.6s infinite; }
.is-ready .duo__crane .fl--2 { animation: floor2 40s linear 2.6s infinite; }
.is-ready .duo__crane .fl--3 { animation: floor3 40s linear 2.6s infinite; }
.is-ready .duo__crane .fl--4 { animation: floor4 40s linear 2.6s infinite; }
.is-ready .duo__crane .fl--5 { animation: floor5 40s linear 2.6s infinite; }

@keyframes craneX {
  0%, 16% { transform: translateX(170px); animation-timing-function: cubic-bezier(.65, 0, .35, 1); }
  45%, 72% { transform: translateX(322px); animation-timing-function: cubic-bezier(.65, 0, .35, 1); }
  92%, 100% { transform: translateX(170px); }
}
@keyframes craneCable {
  0%, 12% { transform: scaleY(3.03); animation-timing-function: cubic-bezier(.45, 0, .25, 1); }
  30%, 45% { transform: scaleY(.6); animation-timing-function: cubic-bezier(.45, 0, .25, 1); }
  60%, 70% { transform: scaleY(1.73); animation-timing-function: cubic-bezier(.45, 0, .25, 1); }
  80%, 92% { transform: scaleY(.6); animation-timing-function: cubic-bezier(.45, 0, .25, 1); }
  100% { transform: scaleY(3.03); }
}
@keyframes craneHook {
  0%, 12% { transform: translateY(203px); animation-timing-function: cubic-bezier(.45, 0, .25, 1); }
  30%, 45% { transform: translateY(-40px); animation-timing-function: cubic-bezier(.45, 0, .25, 1); }
  60%, 70% { transform: translateY(73px); animation-timing-function: cubic-bezier(.45, 0, .25, 1); }
  80%, 92% { transform: translateY(-40px); animation-timing-function: cubic-bezier(.45, 0, .25, 1); }
  100% { transform: translateY(203px); }
}
@keyframes craneLoad { 0%, 70% { opacity: 1; } 71%, 97% { opacity: 0; } 99%, 100% { opacity: 1; } }
@keyframes floor2 { 0%, 12.5% { stroke-dashoffset: 1; opacity: 0; } 13% { opacity: 1; } 16%, 94% { stroke-dashoffset: 0; opacity: 1; } 99%, 100% { stroke-dashoffset: 0; opacity: 0; } }
@keyframes floor3 { 0%, 32.5% { stroke-dashoffset: 1; opacity: 0; } 33% { opacity: 1; } 36%, 94% { stroke-dashoffset: 0; opacity: 1; } 99%, 100% { stroke-dashoffset: 0; opacity: 0; } }
@keyframes floor4 { 0%, 52.5% { stroke-dashoffset: 1; opacity: 0; } 53% { opacity: 1; } 56%, 94% { stroke-dashoffset: 0; opacity: 1; } 99%, 100% { stroke-dashoffset: 0; opacity: 0; } }
@keyframes floor5 { 0%, 72.5% { stroke-dashoffset: 1; opacity: 0; } 73% { opacity: 1; } 76%, 94% { stroke-dashoffset: 0; opacity: 1; } 99%, 100% { stroke-dashoffset: 0; opacity: 0; } }

/* ==========================================================================
   MİMARLIK — çizim kâğıdı, kemer, altın oran
   ========================================================================== */
.duo__paper {
  position: absolute; inset: 0; background-color: var(--cream);
  background-image:
    radial-gradient(90% 70% at 72% 38%, rgba(255, 255, 255, .6), transparent 70%),
    linear-gradient(rgba(23, 21, 15, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 21, 15, .07) 1px, transparent 1px),
    linear-gradient(rgba(23, 21, 15, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 21, 15, .035) 1px, transparent 1px);
  background-size: 100% 100%, 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  transition: background-color 1s var(--ease-out);
}
.duo[data-active="a"] .duo__paper { background-color: #e2dbcd; }

/* Görünen alanın ortasını izleyen katman (kemer + spiral) */
.duo__center {
  --aw: clamp(150px, min(14vw, 21vh), 300px);
  --base: 58%;
  position: absolute; inset: 0; pointer-events: none;
  transform: translate3d(calc(var(--seam) / 2 * 1%), 0, 0);
}
.duo__arch {
  position: absolute; left: 50%; top: var(--base);
  width: var(--aw); height: calc(var(--aw) * 1.5);
  margin: calc(var(--aw) * -1.5) 0 0 calc(var(--aw) / -2);
  transform: scale(var(--kd)); transform-origin: 50% 100%;
}
.duo__arch-win {
  position: absolute; inset: 0; overflow: hidden;
  border-radius: 999px 999px 0 0; background: #d8cfbf;
  box-shadow: 0 50px 90px -50px rgba(23, 21, 15, .55);
}
.duo__arch-win img {
  width: 100%; height: 100%; object-fit: cover; object-position: 50% 62%;
  filter: sepia(.45) saturate(.7) contrast(1.02) brightness(1.03);
  transform: scale(1.1);
  transition: filter 1.1s var(--ease-out), transform 1.8s var(--ease-out);
}
.duo[data-active="b"] .duo__arch-win img { filter: none; transform: scale(1.02); }
.js .duo__arch-win { clip-path: inset(100% 0 0 0); }
.is-ready .duo__arch-win { clip-path: inset(0 0 0 0); transition: clip-path 1.7s var(--ease-io) 1.35s; }

.duo__arch-lines {
  position: absolute; left: -22%; top: -13.333%; width: 144%; height: 126.667%; max-width: none;
  overflow: visible; stroke: var(--char); stroke-width: 1;
}
.duo__arch-lines path, .duo__arch-lines circle { vector-effect: non-scaling-stroke; }
.duo__arch-lines .dl { stroke-dasharray: 1; stroke-dashoffset: 1; opacity: .7; }
.duo__arch-lines .dl--main { stroke: var(--gold); stroke-width: 1.6; opacity: 1; }
.duo__arch-lines .dash { stroke-dasharray: 5 5; opacity: 0; }
.is-ready .duo__arch-lines .dl { stroke-dashoffset: 0; transition: stroke-dashoffset 1.6s var(--ease-io) calc(1.2s + var(--dd, 0s)); }
.is-ready .duo__arch-lines .dash { opacity: .5; transition: opacity 1s 2s; }
.duo__dim { font-family: var(--mono); font-size: 10.5px; letter-spacing: .06em; fill: var(--char); stroke: none; opacity: 0; }
.is-ready .duo__dim { opacity: .75; transition: opacity 1s 2.3s; }
.duo__radius { stroke: var(--gold); opacity: 0; transform-box: fill-box; transform-origin: 0% 50%; }
.duo__radius circle { fill: var(--gold); stroke: none; }
.is-ready .duo__radius { opacity: 1; transition: opacity 1s 2.4s; animation: duoRadius 9s cubic-bezier(.65, 0, .35, 1) 2.4s infinite alternate; }
@keyframes duoRadius { from { transform: rotate(0deg); } to { transform: rotate(-180deg); } }

/* Altın oran spirali — gözü kemerin merkezine oturur */
.duo__spiral {
  position: absolute; width: calc(var(--aw) * 3.2); max-width: none; height: auto; overflow: visible;
  left: calc(50% - var(--aw) * 3.2 * .7237);
  top: calc(var(--base) - var(--aw) - var(--aw) * 1.978 * .724);
  transform: scale(var(--kd)); transform-origin: 72.37% 72.4%;
}
.duo__spiral path { vector-effect: non-scaling-stroke; stroke-dasharray: 1; stroke-dashoffset: 1; }
.duo__spiral-grid { stroke: rgba(23, 21, 15, .16); stroke-width: 1; }
.duo__spiral-curve { stroke: var(--gold); stroke-width: 1.3; opacity: .8; }
.is-ready .duo__spiral-grid { stroke-dashoffset: 0; transition: stroke-dashoffset 2.6s var(--ease-io) 1.3s; }
.is-ready .duo__spiral-curve { stroke-dashoffset: 0; transition: stroke-dashoffset 3.4s var(--ease-io) 1.7s; }
.duo[data-active="b"] .duo__spiral-curve { opacity: 1; }

/* ==========================================================================
   İçerik blokları (başlık · liste · buton)
   ========================================================================== */
.duo__content {
  position: absolute; z-index: 3; bottom: clamp(58px, 9vh, 100px);
  display: flex; flex-direction: column; align-items: flex-start;
  width: min(34vw, 560px);
}
.duo__side--build .duo__content { left: var(--pad); }
.duo__content--end { right: var(--pad); align-items: flex-end; text-align: right; }

.duo__index {
  display: inline-flex; align-items: center; gap: 12px;
  margin-bottom: clamp(8px, 1.6vh, 18px);
  font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: .18em; text-transform: uppercase;
}
.duo__index b { font-weight: 500; color: var(--accent); }
.duo__side--design .duo__index b { color: var(--gold-deep); }
.duo__stripes { width: 34px; height: 8px; background: repeating-linear-gradient(-45deg, var(--accent) 0 3px, transparent 3px 7px); }
.duo__compass { position: relative; width: 15px; height: 15px; border: 1px solid currentColor; border-radius: 50%; }
.duo__compass::before { content: ""; position: absolute; left: 50%; top: 1px; bottom: 50%; width: 1px; background: var(--gold-deep); transform-origin: 50% 100%; animation: spin 12s linear infinite; }

.duo__title { margin: 0; font-weight: 400; line-height: .86; }
.duo__title-in { display: inline-block; white-space: nowrap; }

.duo__title--build {
  font-family: var(--font-display); font-stretch: 125%; font-weight: 800;
  font-size: min(6.3vw, 10.5vh); letter-spacing: -.035em; text-transform: uppercase;
}
.duo__title--build .duo__title-in {
  overflow: hidden; padding: .16em .04em .1em 0; margin: -.16em -.04em -.1em 0;
  transform: scale(var(--kb)); transform-origin: 0 100%;
}
.duo__ch { display: inline-block; }
.js .duo__ch { transform: translate3d(0, 115%, 0); }
.is-ready .duo__ch { transform: none; transition: transform 1.1s var(--ease-out) calc(1.05s + var(--c, 0) * .06s); }

.duo__title--design {
  font-family: var(--font-serif); font-style: italic; font-weight: 400;
  font-size: min(11.5vw, 18vh); letter-spacing: -.025em; color: var(--char);
}
.duo__title--design .duo__title-in {
  padding: .08em .14em .12em .1em; margin: -.08em -.14em -.12em -.1em;
  transform: scale(var(--kd)); transform-origin: 100% 100%;
}
.js .duo__title--design .duo__title-in { clip-path: inset(0 100% 0 0); }
.is-ready .duo__title--design .duo__title-in { clip-path: inset(0 0 0 0); transition: clip-path 1.5s var(--ease-io) 1.15s; }

.duo__list {
  display: flex; flex-wrap: wrap; gap: 6px 0; margin-top: clamp(12px, 2vh, 22px);
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; line-height: 1.4;
}
.duo__content--end .duo__list { justify-content: flex-end; }
.duo__list span { opacity: .82; }
.duo__list span + span::before { content: "/"; margin: 0 10px; opacity: .45; }

.duo__cta {
  display: inline-flex; align-items: center; gap: 14px; margin-top: clamp(16px, 2.8vh, 30px);
  transition: background-color .5s, color .5s, border-color .5s, gap .5s var(--ease-out);
}
.duo__cta i { display: grid; place-items: center; transition: transform .6s var(--ease-out), background-color .5s, color .5s; }

/* İnşaat butonu: pahlı köşe, endüstriyel */
.duo__side--build .duo__cta {
  padding: 12px 12px 12px 20px; background: var(--accent); color: #0b0c0b;
  font-family: var(--font-display); font-stretch: 112%; font-size: 12.5px; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}
.duo__side--build .duo__cta i { width: 28px; height: 28px; background: #0b0c0b; color: var(--accent); font-size: 15px; }
.duo[data-active="a"] .duo__side--build .duo__cta { gap: 22px; }
.duo[data-active="a"] .duo__side--build .duo__cta i { transform: translateX(2px); }

/* Mimarlık butonu: ince çizgili hap, serif italik */
.duo__side--design .duo__cta {
  padding: 8px 8px 8px 22px; border: 1px solid rgba(23, 21, 15, .32); border-radius: 999px;
  font-family: var(--font-serif); font-style: italic; font-size: 20px; line-height: 1.2;
}
.duo__side--design .duo__cta i { width: 36px; height: 36px; border-radius: 50%; background: var(--char); color: var(--cream); font-size: 15px; }
.duo[data-active="b"] .duo__side--design .duo__cta { background: var(--char); color: var(--cream); border-color: var(--char); gap: 22px; }
.duo[data-active="b"] .duo__side--design .duo__cta i { background: var(--gold); color: var(--char); transform: rotate(-45deg); }

/* ==========================================================================
   Orta dikiş + amblem
   ========================================================================== */
.duo__seam {
  position: absolute; inset: 0; z-index: 5; pointer-events: none;
  transform: translate3d(calc((var(--seam) - 50) * 1%), 0, 0);
}
.duo__seam-line {
  position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; margin-left: -.5px;
  background: linear-gradient(to bottom, transparent, var(--gold) 14%, var(--gold) 86%, transparent);
  opacity: .9; transform-origin: 50% 0;
}
.js .duo__seam-line { transform: scaleY(0); }
.is-ready .duo__seam-line { transform: none; transition: transform 1.3s var(--ease-io) .05s; }

.duo__emblem { position: absolute; left: 50%; top: 50%; width: 138px; height: 138px; margin: -69px 0 0 -69px; }
.duo__emblem::before {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  background: radial-gradient(circle at 50% 35%, #1a1c1a, #0b0c0b 70%);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .12), 0 30px 60px -18px rgba(0, 0, 0, .65);
}
/* dış halka: sol yarısı inşaat, sağ yarısı mimarlık rengi */
.duo__emblem::after {
  content: ""; position: absolute; inset: -8px; border-radius: 50%; padding: 1.5px;
  background: conic-gradient(from 180deg, var(--build) 0 50%, var(--design) 50% 100%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
}
.duo__ring { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; animation: spin 28s linear infinite; }
.duo__ring text { font-family: var(--font-display); font-size: 12.5px; font-weight: 700; letter-spacing: 1px; fill: rgba(255, 255, 255, .78); }
.duo__core { position: absolute; inset: 31%; z-index: 1; display: grid; place-items: center; }
.duo__logo { width: 100%; height: auto; color: #fff; overflow: visible; }
.duo__logo path { fill: currentColor; }
.duo__arrow {
  position: absolute; top: 50%; display: grid; place-items: center; width: 28px; height: 28px; margin-top: -14px;
  font-size: 17px; opacity: .45; transition: opacity .5s, transform .7s var(--ease-out);
}
.duo__arrow--a { right: calc(100% + 16px); color: #fff; }
.duo__arrow--b { left: calc(100% + 16px); color: var(--char); }
.duo[data-active="a"] .duo__arrow--a { opacity: 1; transform: translateX(-8px); }
.duo[data-active="b"] .duo__arrow--b { opacity: 1; transform: translateX(8px); }
.js .duo__emblem { opacity: 0; transform: scale(.4) rotate(-120deg); }
.is-ready .duo__emblem { opacity: 1; transform: none; transition: opacity .6s 1s, transform 1.4s var(--ease-back) 1s; }
.duo.is-choosing .duo__emblem { opacity: 0; transform: scale(.6); transition: opacity .4s, transform .6s var(--ease-out); }

/* ==========================================================================
   Ortak başlık ve alt şerit — iki zeminde de okunur (difference)
   ========================================================================== */
.duo__head {
  position: absolute; left: 50%; top: clamp(88px, 12.5vh, 132px); z-index: 7;
  width: min(620px, 44vw); transform: translateX(-50%);
  text-align: center; color: #fff; mix-blend-mode: difference; pointer-events: none;
}
.duo__eyebrow {
  margin: 0 0 12px; font-family: var(--mono); font-size: 10.5px; font-weight: 500;
  letter-spacing: .22em; text-transform: uppercase; opacity: .72;
}
.duo__headline { margin: 0; font-size: clamp(22px, 2.35vw, 38px); font-weight: 400; line-height: 1.12; letter-spacing: -.01em; }
.duo__hl--0, .duo__hl--2 { font-family: var(--font-display); font-stretch: 116%; font-weight: 700; letter-spacing: -.025em; }
.duo__hl--1 { font-family: var(--font-serif); font-style: italic; font-size: 1.2em; line-height: .9; }
.duo__intro { max-width: 440px; margin: 14px auto 0; font-size: 12.5px; line-height: 1.7; opacity: .66; }

.duo__bar {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 7;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 0 var(--pad) clamp(14px, 2.4vh, 24px);
  font-family: var(--mono); font-size: 10px; letter-spacing: .16em; text-transform: uppercase;
  color: #fff; mix-blend-mode: difference; pointer-events: none;
}
.duo__bar > span { opacity: .62; }
.duo__bar-sep { margin: 0 10px; opacity: .5; }
.duo__hint { display: inline-flex; align-items: center; gap: 14px; opacity: .85 !important; }
.duo__hint i { font-style: normal; animation: hintL 2.4s var(--ease-io) infinite; }
.duo__hint i:last-child { animation-name: hintR; }
@keyframes hintL { 50% { transform: translateX(-5px); } }
@keyframes hintR { 50% { transform: translateX(5px); } }

/* Giriş animasyonu (yazılar) */
.js .duo [data-intro] { opacity: 0; transform: translate3d(0, 16px, 0); }
.is-ready .duo [data-intro] { opacity: 1; transform: none; transition: opacity 1s var(--ease-out) var(--id, 1.4s), transform 1.2s var(--ease-out) var(--id, 1.4s); }
.duo__index { --id: 1.25s; }
.duo__list { --id: 1.5s; }
.duo__cta { --id: 1.65s; }
.duo__eyebrow { --id: 1.35s; }
.duo__headline { --id: 1.5s; }
.duo__intro { --id: 1.7s; }
.duo__bar { --id: 1.9s; }
.is-ready .duo .duo__cta[data-intro] { transition: opacity 1s var(--ease-out) var(--id), transform 1.2s var(--ease-out) var(--id), background-color .5s, color .5s, border-color .5s, gap .5s var(--ease-out); }

/* Seçim anı: seçilen taraf tüm ekranı kaplar */
.duo.is-choosing .duo__head, .duo.is-choosing .duo__bar { opacity: 0; transition: opacity .4s; }

/* JS/önyükleyici takılırsa içerik gizli kalmasın */
.js:not(.is-ready) .duo [data-intro], .js:not(.is-ready) .duo__ch, .js:not(.is-ready) .duo__emblem,
.js:not(.is-ready) .duo__seam-line, .js:not(.is-ready) .duo__arch-win, .js:not(.is-ready) .duo__title--design .duo__title-in {
  animation: duoFailsafe .01s 7s forwards;
}
.js:not(.is-ready) .duo__side { animation: duoFailsafeClip .01s 7s forwards; }
@keyframes duoFailsafe { to { opacity: 1; transform: none; clip-path: none; } }
@keyframes duoFailsafeClip { to { clip-path: none; } }

/* Tek panel kullanılırsa */
.duo--single .duo__side, .duo--single .duo__stage, .duo--single .duo__media { transform: none; }

/* ==========================================================================
   Duyarlı tasarım
   ========================================================================== */
@media (max-width: 1180px) {
  .lhead__nav { display: none; }
}
@media (min-width: 900px) and (max-height: 760px) {
  .duo__intro { display: none; }
  .duo__head { top: 84px; }
  .duo__center { --base: 60%; }
}

/* Tablet dikey ve telefon: taraflar alt alta */
@media (max-width: 899px) {
  .duo { height: auto; min-height: 100vh; min-height: 100svh; display: flex; flex-direction: column; }
  .duo__side, .duo__side--build, .duo__side--design { position: relative; inset: auto; transform: none; clip-path: none !important; }
  .duo__stage, .duo__side--build .duo__stage, .duo__side--design .duo__stage, .duo__media, .duo__center { transform: none; }
  .duo__side--build { order: 1; flex: 1 0 auto; min-height: 56svh; min-height: max(56svh, 430px); }
  .duo__seam { order: 2; position: relative; inset: auto; height: 0; transform: none; }
  .duo__side--design { order: 3; flex: 1 0 auto; min-height: 44svh; min-height: max(44svh, 390px); }
  .js .duo__side--build, .js .duo__side--design { clip-path: none; }

  .duo__seam-line { left: 0; right: 0; top: 0; bottom: auto; width: auto; height: 1px; margin: 0; background: linear-gradient(90deg, transparent, var(--gold) 12%, var(--gold) 88%, transparent); transform-origin: 0 50%; }
  .js .duo__seam-line { transform: scaleX(0); }
  .duo__emblem { top: 0; left: auto; right: 20px; width: 92px; height: 92px; margin: -46px 0 0; }
  .duo__emblem::after { inset: -6px; background: conic-gradient(from -90deg, var(--build) 0 50%, var(--design) 50% 100%); }
  .duo__ring text { font-size: 13.5px; }
  .duo__arrow { display: none; }

  .lhead, .duo__head { mix-blend-mode: normal; }
  .duo__head { top: 78px; left: 20px; right: 20px; width: auto; transform: none; text-align: left; }
  .duo__eyebrow { font-size: 9.5px; margin-bottom: 8px; }
  .duo__headline { font-size: clamp(20px, 5.4vw, 28px); }
  .duo__intro { display: none; }

  .duo__crane { left: auto; right: -4vw; top: auto; bottom: 36%; width: 62vw; transform: none; opacity: .75; }
  .duo__content { left: 20px !important; right: 20px; bottom: 30px; width: auto; }
  .duo__content--end { left: 20px; right: 20px !important; bottom: 28px; }
  .duo__title--build { font-size: 13.5vw; }
  .duo__title--build .duo__title-in, .duo__title--design .duo__title-in { transform: none; }
  .duo__title--design { font-size: 22vw; }
  .duo__list { font-size: 10px; }

  .duo__center { --aw: min(30vw, 150px); }
  .duo__arch { left: 44px; top: 34px; margin: 0; transform: none; transform-origin: 0 0; }
  .duo__spiral { left: calc(44px + var(--aw) / 2 - var(--aw) * 3.2 * .7237); top: calc(34px + var(--aw) / 2 - var(--aw) * 1.978 * .724); transform: none; opacity: .6; }

  .duo__bar { display: none; }
}
@media (max-width: 480px) {
  .lhead { padding: 14px 18px; }
  .lhead__logo svg { width: 48px; }
  .lhead__logo-text { display: none; }
  .lhead__phone span { display: none; }
  .lhead__cta { padding: 10px 16px; font-size: 12px; }
  .duo__side--build .duo__cta { font-size: 11.5px; }
  .duo__side--design .duo__cta { font-size: 18px; }
}

/* ==========================================================================
   Azaltılmış hareket
   ========================================================================== */
.reduced-motion .duo *, .reduced-motion .duo *::before, .reduced-motion .duo *::after,
.reduced-motion .lhead { animation: none !important; transition: none !important; }
.reduced-motion .duo__crane .fl { opacity: 1; stroke-dashoffset: 0; }