:root {
  --color-primary: #0b2a4a;
  --color-accent: #c8102e;
  --color-text: #1f2933;
  --color-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6f8;
  --container: 1200px;

  /* Beyaz zeminli bölümlerin sıcak paleti (hero tonlarından) */
  --warm-bg: #ffffff;
  --warm-surface: #fffaf3;
  --warm-border: rgba(194, 110, 20, 0.18);
  --gold: #b45309; /* hero altınının beyaz zeminde okunur koyu tonu */
  --gold-light: #f5c26b;
  --ember: #f97316;
  --text-warm: #1c140d;
  --text-warm-muted: #6b5d4f;
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 16px;
}

/* Header hero'nun üstünde şeffaf durur ve onunla birlikte kayar */
.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  color: #fff;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo { display: flex; align-items: center; }
.logo img { height: 47px; width: auto; }
.site-header nav { display: flex; gap: 24px; margin-left: auto; }
.site-header nav a:hover { color: var(--color-accent); }

.lang-switch {
  display: flex;
  margin-left: 32px;
  border: 1px solid currentColor;
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch button {
  padding: 4px 12px;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.2s, background 0.2s;
}
.lang-switch button:hover { opacity: 1; }
.lang-switch button[aria-pressed="true"] {
  opacity: 1;
  background: rgba(255, 255, 255, 0.2);
}

.hero {
  position: relative;
  height: 100vh;
  height: 100svh;
  min-height: 520px;
  overflow: hidden;
  background: #000;
  color: #fff;
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
.hero-content {
  position: relative;
  z-index: 1;
  height: 100%;
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.hero-title {
  margin: 0 0 24px;
  font-family: "Montserrat", system-ui, sans-serif;
  /* Montserrat geniş bir font; MÜHENDİSLİK mobilde taşmasın diye boyut biraz küçük */
  font-size: clamp(2.25rem, 8vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.02em;
}
.hero-line {
  display: block;
  color: #fff;
}
/* İkinci satır arka plandaki sıcak tonlarla uyumlu altın rengi */
.hero-line-2 { color: #f5c26b; }
.hero-subtitle {
  max-width: 48rem;
  margin: 0;
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 300;
  line-height: 1.6;
  color: rgba(255, 237, 213, 0.9);
}
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { opacity: 0; animation: fade-in-up 0.8s ease-out forwards; }
.delay-200 { animation-delay: 0.2s; }
.delay-400 { animation-delay: 0.4s; }
.delay-600 { animation-delay: 0.6s; }

@media (prefers-reduced-motion: reduce) {
  .fade-in-up { opacity: 1; animation: none; }
}

/* Tanıtım: istatistikler ve kayan fotoğraf şeridi */
.intro {
  padding: 120px 0 96px;
  background: var(--warm-bg);
  color: var(--text-warm);
}
.intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 72px;
  align-items: center;
}
/* Kayan şerit sütunu genişletmesin */
.intro-grid > * { min-width: 0; }

.intro-tag {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--warm-border);
  border-radius: 999px;
  background: var(--warm-surface);
  color: var(--gold);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.intro-title {
  margin: 24px 0;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: clamp(2.2rem, 4.4vw, 3.6rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
}
.intro-title span { display: block; }
.intro-highlight {
  background: linear-gradient(90deg, #ea580c, var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.intro-lead {
  max-width: 560px;
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-warm-muted);
}

/* İstatistikler: sağdan sola sonsuz kayan şerit */
.intro-stats {
  margin: 40px 0;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
}
.stats-track {
  display: flex;
  width: max-content;
  margin: 0;
  animation: marquee-left 22s linear infinite;
}
.intro-stats:hover .stats-track { animation-play-state: paused; }
@keyframes marquee-left {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.intro-stat {
  display: flex;
  flex-direction: column-reverse; /* sayı üstte, etiket altta */
  justify-content: flex-end; /* etiket iki satıra taşsa da sayılar aynı hizada */
  gap: 6px;
  width: 240px;
  padding: 24px 32px;
}
.intro-stat dd {
  margin: 0;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: clamp(1.7rem, 2.6vw, 2.3rem);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.intro-stat dt {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-warm-muted);
}

.intro-actions { display: flex; flex-wrap: wrap; gap: 16px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  border-radius: 12px;
  border: 0; /* <button> olarak kullanıldığında varsayılan kenarlık çıkmasın */
  font-family: inherit;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.3s, box-shadow 0.3s, background 0.3s, border-color 0.3s;
}
.btn svg { width: 18px; height: 18px; transition: transform 0.3s; }
.btn:hover { transform: translateY(-2px); }
.btn:hover svg { transform: translateX(4px); }
.btn-primary {
  background: linear-gradient(90deg, #ea580c, #d97706);
  color: #fff;
  box-shadow: 0 12px 24px -12px rgba(234, 88, 12, 0.6);
}
.btn-primary:hover { box-shadow: 0 18px 32px -12px rgba(234, 88, 12, 0.7); }
.btn-outline {
  border: 1px solid var(--warm-border);
  background: var(--warm-surface);
  color: var(--text-warm);
}
.btn-outline:hover { border-color: var(--gold); }

/* Sağ taraf: iki sütun, zıt yönlere sonsuz kayan fotoğraflar */
.intro-visual { position: relative; }
.intro-slider {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  height: 600px;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(to bottom, transparent, #000 12%, #000 88%, transparent);
}
.marquee { overflow: hidden; }
.marquee-track {
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: marquee-up 40s linear infinite;
}
.marquee-down .marquee-track { animation-name: marquee-down; animation-duration: 46s; }
.intro-slider:hover .marquee-track { animation-play-state: paused; }
.marquee-track img {
  width: 100%;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  border-radius: 16px;
}
/* İçerik JS ile iki kez yazılır; yarısı kadar kayınca başa sarar (+ yarım boşluk) */
@keyframes marquee-up {
  from { transform: translateY(0); }
  to { transform: translateY(calc(-50% - 8px)); }
}
@keyframes marquee-down {
  from { transform: translateY(calc(-50% - 8px)); }
  to { transform: translateY(0); }
}

.intro-card {
  position: absolute;
  left: -40px;
  right: 40px;
  bottom: 32px;
  padding: 28px 32px;
  border: 1px solid var(--warm-border);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  box-shadow: 0 30px 60px -24px rgba(60, 30, 5, 0.35);
}
.intro-card-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ember);
}
.intro-card h3 {
  margin: 10px 0 8px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 1.3rem;
  font-weight: 800;
  line-height: 1.3;
}
.intro-card p { margin: 0; font-size: 0.95rem; line-height: 1.6; color: var(--text-warm-muted); }

@media (max-width: 960px) {
  .intro { padding: 88px 0 72px; }
  .intro-grid { grid-template-columns: 1fr; gap: 56px; }
  .intro-slider { height: 460px; }
  .intro-card { left: 16px; right: 16px; bottom: 16px; }
}
@media (max-width: 600px) {
  .intro-stat { width: 200px; padding: 20px 24px; }
  .intro-actions .btn { flex: 1 1 100%; justify-content: center; }
  .intro-card { padding: 22px 24px; }
}
@media (prefers-reduced-motion: reduce) {
  .marquee-track,
  .stats-track { animation: none; }
  .btn, .btn svg { transition: none; }
}

/* Hakkımızda: beyaz zemin, vurgular hero'nun sıcak tonlarından */
.about {
  position: relative;
  padding: 128px 0 120px;
  overflow: hidden;
  background: var(--warm-bg);
  color: var(--text-warm);
}

/* Arka planda yavaşça dolaşan sıcak ışık hüzmeleri */
.about-glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  animation: glow-drift 18s ease-in-out infinite alternate;
}
.about-glow-1 {
  width: 760px;
  height: 760px;
  top: -260px;
  left: -280px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.08), transparent 70%);
}
.about-glow-2 {
  width: 680px;
  height: 680px;
  bottom: -240px;
  right: -240px;
  background: radial-gradient(circle, rgba(245, 194, 107, 0.14), transparent 70%);
  animation-duration: 22s;
  animation-direction: alternate-reverse;
}
@keyframes glow-drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(80px, 60px) scale(1.15); }
}

.about .container { position: relative; }
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-tag {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--gold);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
/* Etiketin önündeki altın çizgi görünür olunca uzar */
.about-tag::before {
  content: "";
  width: 48px;
  height: 2px;
  background: linear-gradient(to right, var(--ember), var(--gold));
  transform-origin: left;
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.3s;
}
.js .about-tag:not(.is-visible)::before { transform: scaleX(0); }

.about-title {
  margin: 20px 0 32px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: clamp(2rem, 3.6vw, 3rem);
  font-weight: 800;
  line-height: 1.12;
  color: var(--text-warm);
}
.about-content > p {
  margin: 0 0 22px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-warm-muted);
}
.about-content strong { color: var(--gold); font-weight: 600; }

/* Fotoğraf kolajı */
.about-media {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 540px;
  width: 100%;
  justify-self: end;
}
.about-photo {
  position: absolute;
  margin: 0;
  overflow: hidden;
  border-radius: 20px;
  box-shadow: 0 30px 60px -24px rgba(60, 30, 5, 0.45);
}
.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* Soğuk tonlu fotoğrafları sahnenin sıcak paletine yaklaştır */
  filter: sepia(0.35) saturate(0.85) contrast(1.05) brightness(0.9);
  transition: transform 1.4s cubic-bezier(0.22, 1, 0.36, 1), filter 0.6s;
}
.about-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(249, 115, 22, 0.14), rgba(28, 20, 13, 0.25));
  pointer-events: none;
}
.about-photo:hover img { transform: scale(1.06); filter: sepia(0.15) saturate(1) brightness(1); }
.about-photo-main { top: 0; right: 0; width: 76%; height: 74%; }
/* Bu fotoğraf zaten sıcak tonlu; filtre yerine orijinal renkleri */
.about-photo-main img,
.about-photo-main:hover img { filter: none; }
.about-photo-main::after { opacity: 0.4; }
.about-photo-small {
  bottom: 0;
  left: 0;
  width: 52%;
  height: 50%;
  border: 6px solid var(--warm-bg);
}

/* Alıntı ve misyon kartları */
.about-cards {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 24px;
  margin-top: 96px;
}
.about-cards > .reveal { display: flex; }
.about-card {
  flex: 1;
  position: relative;
  margin: 0;
  padding: 36px;
  border: 1px solid var(--warm-border);
  border-radius: 20px;
  background: var(--warm-surface);
  transition: transform 0.4s, border-color 0.4s, box-shadow 0.4s;
}
.about-card:hover {
  transform: translateY(-4px);
  border-color: rgba(194, 110, 20, 0.4);
  box-shadow: 0 24px 48px -24px rgba(180, 83, 9, 0.3);
}
.about-card-icon { width: 28px; height: 28px; flex-shrink: 0; color: var(--gold); }
/* Alıntı kartı hero'nun koyu sıcak tonlarını taşır */
.about-quote {
  border-color: transparent;
  background: linear-gradient(145deg, #2a1a0e, #140d08);
}
.about-quote .about-card-icon { color: var(--gold-light); }
.about-quote p {
  margin: 20px 0 0;
  font-size: 1.15rem;
  font-style: italic;
  line-height: 1.6;
  color: #fff;
}
.mission-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-warm);
}
.mission p { margin: 0; font-size: 1rem; line-height: 1.8; color: var(--text-warm-muted); }

/* Kaydırınca beliren öğeler (JS kapalıysa hepsi baştan görünür) */
.js .reveal {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: calc(var(--d, 0) * 0.12s);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

/* Fotoğraflar perde açılır gibi ortaya çıkar */
.js .reveal-photo {
  clip-path: inset(100% 0 0 0 round 20px);
  transition: clip-path 1.2s cubic-bezier(0.77, 0, 0.18, 1);
  transition-delay: calc(var(--d, 0) * 0.12s);
}
.js .reveal-photo img { transform: scale(1.2); }
.js .reveal-photo.is-visible { clip-path: inset(0 0 0 0 round 20px); }
.js .reveal-photo.is-visible img { transform: scale(1); }
.js .reveal-photo.is-visible:hover img { transform: scale(1.06); }

@media (max-width: 960px) {
  .about { padding: 96px 0 88px; }
  .about-grid { grid-template-columns: 1fr; gap: 64px; }
  .about-media { justify-self: center; }
  .about-cards { grid-template-columns: 1fr; margin-top: 64px; }
}
@media (max-width: 600px) {
  .about-card { padding: 28px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .about-glow { animation: none; }
  .js .reveal,
  .js .reveal-photo,
  .js .reveal-photo img,
  .about-tag::before {
    opacity: 1;
    transform: none;
    clip-path: none;
    transition: none;
  }
}

/* Faaliyet alanları: tıklayınca dönen kartlar */
.sectors {
  padding: 112px 0 128px;
  background: var(--warm-bg);
  color: var(--text-warm);
}
.section-head {
  max-width: 720px;
  margin: 0 auto 64px;
  text-align: center;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--gold);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.section-tag::before,
.section-tag::after {
  content: "";
  width: 32px;
  height: 2px;
  background: linear-gradient(to right, var(--ember), var(--gold));
}
.section-title {
  margin: 18px 0 16px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.12;
}
.section-lead {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-warm-muted);
}

.sectors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.sector-card {
  position: relative;
  perspective: 1600px;
}
.sector-inner {
  display: grid;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}
.sector-card.is-flipped .sector-inner { transform: rotateY(180deg); }

/* Ön ve arka yüz aynı hücrede üst üste; kart yüksekliği uzun olana göre */
.sector-face {
  grid-area: 1 / 1;
  position: relative;
  min-height: 520px;
  overflow: hidden;
  border-radius: 24px;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.sector-front {
  display: flex;
  align-items: flex-end;
  box-shadow: 0 30px 60px -28px rgba(60, 30, 5, 0.5);
}
.sector-front img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}
.sector-front::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(20, 12, 6, 0.9) 0%, rgba(20, 12, 6, 0.35) 45%, rgba(20, 12, 6, 0) 70%);
}
.sector-card:hover .sector-front img { transform: scale(1.06); }
.sector-front-content {
  position: relative;
  z-index: 1;
  padding: 32px;
  color: #fff;
}
.sector-num {
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--gold-light);
}
.sector-front h3 {
  margin: 8px 0 18px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.25;
}

.sector-hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
}
.sector-hint svg { width: 16px; height: 16px; transition: transform 0.6s; }
.sector-card:hover .sector-hint svg { transform: rotate(-180deg); }
.sector-front .sector-hint {
  padding: 8px 14px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(6px);
}

.sector-back {
  display: flex;
  flex-direction: column;
  padding: 40px 36px 32px;
  border: 1px solid var(--warm-border);
  background: var(--warm-surface);
  transform: rotateY(180deg);
}
.sector-icon {
  display: grid;
  place-items: center;
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: linear-gradient(145deg, rgba(249, 115, 22, 0.14), rgba(245, 194, 107, 0.2));
  color: var(--gold);
}
.sector-icon svg { width: 28px; height: 28px; }
.sector-back h3 {
  margin: 28px 0 14px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.3;
}
.sector-back p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-warm-muted);
}
.sector-list {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--warm-border);
  list-style: none;
  font-size: 0.95rem;
  font-weight: 600;
}
.sector-list li { display: flex; align-items: flex-start; gap: 10px; }
.sector-check { width: 18px; height: 18px; flex-shrink: 0; margin-top: 2px; color: var(--ember); }
.sector-back .sector-hint { margin-top: auto; padding-top: 24px; color: var(--gold); }

/* Kartın tamamı tıklanabilir; klavyeyle de çalışır */
.sector-toggle {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  border: 0;
  border-radius: 24px;
  background: transparent;
  cursor: pointer;
}
.sector-toggle:focus-visible { outline: 3px solid var(--ember); outline-offset: 4px; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 1024px) {
  .sectors-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
  .sectors { padding: 88px 0 96px; }
  .sectors-grid { grid-template-columns: 1fr; }
  .sector-face { min-height: 460px; }
  .sector-back { padding: 32px 28px 28px; }
}
@media (prefers-reduced-motion: reduce) {
  .sector-inner,
  .sector-front img,
  .sector-hint svg { transition: none; }
}

/* Ürün ve hizmet kataloğu */
.catalog {
  padding: 112px 0 128px;
  background: var(--warm-bg);
  color: var(--text-warm);
}
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.catalog-card {
  position: relative;
  padding: 36px 32px;
  overflow: hidden;
  border: 1px solid var(--warm-border);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 20px 40px -32px rgba(60, 30, 5, 0.35);
}
/* Beliriş animasyonu ile üzerine gelme efektleri birlikte çalışsın */
.js .catalog-card.reveal {
  transition:
    opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.9s cubic-bezier(0.22, 1, 0.36, 1),
    translate 0.4s,
    box-shadow 0.4s,
    border-color 0.4s;
  transition-delay: calc(var(--d, 0) * 0.12s), calc(var(--d, 0) * 0.12s), 0s, 0s, 0s;
}
/* Üzerine gelince üstte kehribar çizgi uzar, kart hafifçe yükselir */
.catalog-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ember), var(--gold-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.catalog-card:hover::before { transform: scaleX(1); }
.catalog-card:hover {
  translate: 0 -6px;
  border-color: rgba(194, 110, 20, 0.35);
  box-shadow: 0 28px 48px -28px rgba(180, 83, 9, 0.35);
}
.catalog-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 24px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 1.2rem;
  font-weight: 800;
  line-height: 1.3;
}
.catalog-icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(145deg, rgba(249, 115, 22, 0.14), rgba(245, 194, 107, 0.2));
  color: var(--gold);
  transition: transform 0.4s;
}
.catalog-icon svg { width: 24px; height: 24px; }
.catalog-card:hover .catalog-icon { transform: rotate(-8deg) scale(1.08); }
.catalog-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.98rem;
  color: var(--text-warm-muted);
}
.catalog-list li {
  position: relative;
  padding-left: 20px;
}
.catalog-list li::before {
  content: "";
  position: absolute;
  top: 0.6em;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ember);
}

@media (max-width: 1024px) {
  .catalog-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
  .catalog { padding: 88px 0 96px; }
  .catalog-grid { grid-template-columns: 1fr; }
  .catalog-card { padding: 28px 24px; }
}
@media (prefers-reduced-motion: reduce) {
  .js .catalog-card.reveal,
  .catalog-card::before,
  .catalog-icon { transition: none; }
}

/* Saha ve proje uygulamaları: 3B dönen fotoğraf halkası */
.projects {
  padding: 112px 0 96px;
  overflow: hidden; /* halka ekrandan geniş; yatay kaydırma çıkmasın */
  background: var(--warm-bg);
  color: var(--text-warm);
}
.ring {
  --card: clamp(140px, 38vw, 280px);
  --radius: clamp(220px, 58vw, 470px);
  position: relative;
  height: clamp(300px, 52vw, 460px);
  perspective: 2000px;
  cursor: grab;
  touch-action: pan-y; /* dikey kaydırma sayfaya, yatay sürükleme halkaya */
  user-select: none;
  -webkit-user-select: none;
}
.ring.is-dragging { cursor: grabbing; }
.ring-stage {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  will-change: transform;
}
.ring-card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--card);
  aspect-ratio: 1;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 18px;
  background: var(--warm-surface);
  box-shadow: 0 30px 50px -24px rgba(60, 30, 5, 0.55);
  cursor: pointer;
}
.ring-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.ring-card:hover img { transform: scale(1.06); }
.ring-card:focus-visible { outline: 3px solid var(--ember); outline-offset: 4px; }

.ring-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 24px 16px 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-warm-muted);
  text-align: center;
}
.ring-hint svg { width: 20px; height: 20px; flex-shrink: 0; color: var(--gold); }

/* Büyük görünüm */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
  background: rgba(14, 10, 7, 0.94);
  animation: lightbox-in 0.3s ease-out;
}
.lightbox[hidden] { display: none; }
@keyframes lightbox-in {
  from { opacity: 0; }
  to { opacity: 1; }
}
.lightbox-figure { margin: 0; text-align: center; }
.lightbox-img {
  display: block;
  max-width: min(1200px, calc(100vw - 180px));
  max-height: calc(100vh - 120px);
  border-radius: 14px;
  box-shadow: 0 40px 80px -20px rgba(0, 0, 0, 0.8);
  animation: lightbox-zoom 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes lightbox-zoom {
  from { opacity: 0; transform: scale(0.94); }
  to { opacity: 1; transform: none; }
}
.lightbox-caption {
  margin-top: 14px;
  font-size: 0.9rem;
  color: rgba(255, 237, 213, 0.75);
}
.lightbox-btn {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.lightbox-btn:hover { background: rgba(249, 115, 22, 0.35); border-color: var(--ember); }
.lightbox-btn:focus-visible { outline: 3px solid var(--ember); outline-offset: 3px; }
.lightbox-btn svg { width: 22px; height: 22px; }
.lightbox-close { position: absolute; top: 20px; right: 20px; }

@media (max-width: 680px) {
  .projects { padding: 88px 0 72px; }
  .lightbox { padding: 16px; }
  .lightbox-img { max-width: calc(100vw - 32px); max-height: calc(100vh - 180px); }
  /* Telefonda oklar fotoğrafın altında */
  .lightbox-prev,
  .lightbox-next { position: absolute; bottom: 24px; }
  .lightbox-prev { left: calc(50% - 64px); }
  .lightbox-next { right: calc(50% - 64px); }
}
@media (prefers-reduced-motion: reduce) {
  .ring-card img { transition: none; }
  .lightbox,
  .lightbox-img { animation: none; }
}

/* Konum: Google Haritalar ve adres kartı */
.location {
  padding: 112px 0 128px;
  background: var(--warm-bg);
  color: var(--text-warm);
}
.map-wrap {
  position: relative;
  height: clamp(420px, 48vw, 540px);
  overflow: hidden;
  border: 1px solid var(--warm-border);
  border-radius: 24px;
  background: var(--warm-surface);
  box-shadow: 0 40px 70px -40px rgba(60, 30, 5, 0.45);
}
.map-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}
.map-card {
  position: absolute;
  left: 24px;
  bottom: 24px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  max-width: 420px;
  padding: 24px;
  border: 1px solid var(--warm-border);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 24px 48px -20px rgba(60, 30, 5, 0.4);
}
.map-card-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(145deg, rgba(249, 115, 22, 0.14), rgba(245, 194, 107, 0.2));
  color: var(--gold);
}
.map-card-icon svg { width: 24px; height: 24px; }
.map-card-label {
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 1.05rem;
  font-weight: 800;
}
.map-card address {
  margin-top: 4px;
  font-style: normal;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--text-warm-muted);
}
.map-card-actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.btn-sm { padding: 10px 16px; border-radius: 10px; font-size: 0.9rem; }
.btn-sm svg { width: 16px; height: 16px; }
.btn-sm:hover svg { transform: none; }

@media (max-width: 680px) {
  .location { padding: 88px 0 96px; }
  /* Telefonda kart haritanın altına iner, harita kapanmaz */
  .map-wrap { height: auto; }
  .map-frame { height: 360px; }
  .map-card {
    position: static;
    max-width: none;
    border: 0;
    border-top: 1px solid var(--warm-border);
    border-radius: 0;
    box-shadow: none;
    backdrop-filter: none;
  }
  .map-card-actions .btn { flex: 1 1 auto; justify-content: center; }
}

/* İletişim: bilgiler ve proje formu */
.contact {
  padding: 112px 0 128px;
  background: var(--warm-bg);
  color: var(--text-warm);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 72px;
  align-items: start;
}
.contact-grid > * { min-width: 0; }
.contact-tag::after { display: none; } /* sola hizalı başlıkta tek çizgi */
.contact-info .section-lead { max-width: 460px; }

.contact-list {
  display: grid;
  gap: 24px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}
.contact-item { display: flex; align-items: center; gap: 18px; }
.contact-icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(145deg, rgba(249, 115, 22, 0.14), rgba(245, 194, 107, 0.2));
  color: var(--gold);
  transition: transform 0.3s;
}
.contact-icon svg { width: 24px; height: 24px; }
.contact-item:hover .contact-icon { transform: scale(1.08) rotate(-6deg); }
.contact-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-warm-muted);
}
.contact-value {
  display: block;
  margin-top: 2px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 1.2rem;
  font-weight: 800;
  overflow-wrap: anywhere;
  transition: color 0.2s;
}
.contact-value:hover { color: var(--gold); }
.contact-sub { display: block; font-size: 0.92rem; color: var(--text-warm-muted); }

.contact-form {
  display: grid;
  gap: 20px;
  padding: 40px;
  border: 1px solid var(--warm-border);
  border-radius: 24px;
  background: var(--warm-surface);
  box-shadow: 0 40px 70px -48px rgba(60, 30, 5, 0.45);
}
.contact-form-title {
  margin: 0 0 4px;
  font-family: "Montserrat", system-ui, sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-field { display: grid; gap: 8px; }
.form-field label { font-size: 0.88rem; font-weight: 700; }
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--warm-border);
  border-radius: 12px;
  background: #fff;
  color: var(--text-warm);
  font: inherit;
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-field textarea { resize: vertical; min-height: 130px; }
.form-field ::placeholder { color: #a8998a; }
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--ember);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.15);
}
/* Yalnızca kullanıcı dokunduktan sonra hatalı alanları göster */
.form-field input:user-invalid,
.form-field textarea:user-invalid { border-color: #dc2626; }
.contact-submit { justify-content: center; width: 100%; margin-top: 4px; font-size: 1.05rem; }
.contact-status {
  margin: 0;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(22, 163, 74, 0.08);
  color: #15803d;
  font-size: 0.92rem;
  line-height: 1.6;
}

@media (max-width: 960px) {
  .contact-grid { grid-template-columns: 1fr; gap: 56px; }
}
@media (max-width: 600px) {
  .contact { padding: 88px 0 96px; }
  .contact-form { padding: 28px 22px; }
  .form-row { grid-template-columns: 1fr; }
  .contact-value { font-size: 1.1rem; }
}

.site-footer {
  padding: 32px 0;
  border-top: 1px solid rgba(194, 110, 20, 0.15);
  background: #fff;
  color: #6b5d4f;
  font-size: 0.9rem;
}

.nav-toggle { display: none; }

/* Telefon: sabit başlık, hamburger menü, daha sıkı bölüm boşlukları */
@media (max-width: 720px) {
  .site-header {
    position: fixed;
    transition: background 0.3s, box-shadow 0.3s;
  }
  .site-header.is-scrolled,
  .site-header.is-open {
    background: rgba(28, 20, 13, 0.94);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.5);
  }
  .site-header .container { height: 64px; }
  .logo img { height: 40px; }

  .lang-switch { margin-left: auto; }
  .lang-switch button { padding: 8px 14px; }

  .nav-toggle {
    display: grid;
    align-content: center;
    justify-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    margin: 0 -8px 0 8px;
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
  }
  .nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    border-radius: 2px;
    background: currentColor;
    transition: transform 0.3s, opacity 0.2s;
  }
  .site-header.is-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .site-header.is-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .site-header.is-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav-toggle:focus-visible { outline: 2px solid var(--gold-light); outline-offset: 2px; }

  .site-header nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 4px 16px 20px;
    background: rgba(28, 20, 13, 0.97);
    box-shadow: 0 24px 40px -16px rgba(0, 0, 0, 0.6);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.25s, transform 0.25s, visibility 0s 0.25s;
  }
  .site-header.is-open nav {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: opacity 0.25s, transform 0.25s;
  }
  .site-header nav a {
    padding: 16px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-family: "Montserrat", system-ui, sans-serif;
    font-size: 1.1rem;
    font-weight: 800;
  }
  .site-header nav a:last-child { border-bottom: 0; }
  .site-header nav a:hover,
  .site-header nav a:active { color: var(--gold-light); }

  /* Bölümler arası boşluklar telefonda daha kısa */
  .intro { padding: 64px 0 56px; }
  .about { padding: 72px 0 64px; }
  .sectors,
  .catalog,
  .location,
  .contact { padding: 72px 0; }
  .projects { padding: 72px 0 56px; }
  .section-head { margin-bottom: 40px; }
  .about-grid { gap: 48px; }
  .about-cards { margin-top: 48px; }

  /* Tanıtım kartı fotoğrafları örtmesin; şeridin altına biraz binsin */
  .intro-slider { height: 400px; }
  .intro-card {
    position: relative;
    left: auto;
    right: auto;
    bottom: auto;
    margin: -72px 12px 0;
  }
}
@media (max-width: 720px) and (prefers-reduced-motion: reduce) {
  .site-header,
  .site-header nav,
  .nav-toggle span { transition: none; }
}