:root {
  --ease-standard: cubic-bezier(0.4, 0.0, 0.2, 1);
  --font-main: 'Helvetica Neue', 'Arial', sans-serif;
  --black: #1a1a1a;
  --header-height: 140px; 
}

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

body {
  font-family: var(--font-main);
  background: #fff;
  color: var(--black);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

/* ============= HEADER ============= */
#main-header {
  position: fixed;
  top: 0;
  left: 50%; 
  width: max-content;
  height: var(--header-height);
  z-index: 500; 
  padding-top: 0.7rem; 
  display: flex;
  align-items: flex-start; 
  will-change: transform;
  transition: transform 0.8s var(--ease-standard) 0.6s;
  transform: translateX(calc(-50vw + 1.5rem));
}

.nav-track {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  white-space: nowrap;
  transition: gap 0.8s var(--ease-standard) 0.6s;
}

#main-header.state-works { transform: translateX(calc(-50vw + 1.5rem)); }
#main-header.state-about { transform: translateX(-50%); }
#main-header.state-contact { transform: translateX(calc(50vw - 100% - 1.5rem)); }
#main-header.state-detail { transform: translateX(calc(-50vw + 26vw)); }

.nav-item {
  text-decoration: none;
  color: var(--black);
  font-weight: 700;
  line-height: 0.85;
  font-size: 0.8rem; 
  opacity: 0.4;
  transform-origin: top left; 
  transform: scale(1);
  transition: font-size 0.6s var(--ease-standard), opacity 0.4s ease;
}
.nav-item.active {
  font-size: 8rem; 
  opacity: 1;
  letter-spacing: -3px;
}
#main-header.state-detail .nav-item {
  font-size: 0.8rem !important;
  letter-spacing: normal;
  opacity: 1;
}
.nav-item:hover { opacity: 1; }

/* ============= FOOTER ============= */
.site-footer {
  position: fixed;
  bottom: 0.7rem;
  left: 26%; 
  font-weight: 700;
  font-size: 0.8rem;
  color: #000;
  z-index: 600; 
  pointer-events: none;
}

/* ============= WORKS VIEW ============= */
#view-works {
  display: grid;
  /* Grid yapısı korunuyor ama orta kolon fixed olacak */
  grid-template-columns: 25% 15% 60%; 
  height: 100vh;
  padding-top: var(--header-height);
  overflow-y: auto;
  scrollbar-width: none;
  scroll-behavior: smooth;
  padding-left: 0.7rem;
  padding-right: 0.7rem;
  padding-bottom: 50vh; 
  transition: opacity 0.5s ease;
}
#view-works::-webkit-scrollbar { display: none; }

/* SOL KOLON */
.zone-left {
  padding-top: 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr; 
  gap: 0.7rem; 
  align-content: start;
}
.project-number {
  grid-column: 1 / -1; 
  font-size: 2rem; 
  font-weight: 700;
  margin-top: 6rem; 
  margin-bottom: 0.5rem;
}
.project-number:first-child { margin-top: 0; }

/* SAĞ KOLON */
.zone-right {
  padding-top: 1rem; 
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr); 
  gap: 0.7rem;
  align-content: start;
  transition: opacity 0.5s ease;
}
.zone-right.faded { opacity: 0; pointer-events: none; }
.spacer-number {
  grid-column: 1 / -1;
  height: 3rem; 
  margin-top: 6rem;
  margin-bottom: 0.5rem;
}
.spacer-number:first-child { margin-top: 0; }

.work-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  cursor: pointer;
  background-color: #f0f0f0; 
  transition: opacity 0.3s;
}
.work-img:hover { opacity: 0.8; }

/* --- ORTA KOLON (TAMAMEN DEĞİŞTİ - FIXED YAPI) --- */
.zone-middle {
  /* Artık grid akışında değil, ekrana sabitlendi */
  position: fixed; 
  top: 0;
  /* Grid'in 2. kolonu %25'ten başlıyor ve %15 genişliğinde */
  left: 25.7vw; /* Grid boşluklarını telafi etmek için ince ayar */
  width: 15vw;
  height: 100vh;
  
  z-index: 50;
  padding: 0; 
  padding-left: 0.5rem;
  pointer-events: none; /* Boş alanlar tıklamayı engellemesin */
  
  /* Flexbox ile içeriği dikeyde ortala */
  display: flex;
  flex-direction: column;
  justify-content: center; /* Dikey ortalama */
}

.sticky-wrapper {
  /* Sticky yok, transform yok. Sadece bir kutu. */
  position: relative;
  width: 100%;
  
  /* Liste yüksekliği */
  max-height: 60vh;
  
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  
  /* Maskeleme */
  mask-image: linear-gradient(to bottom, transparent 0%, black 15%, black 85%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 15%, black 85%, transparent 100%);
  
  pointer-events: auto; /* Liste tıklanabilir */
}
.sticky-wrapper::-webkit-scrollbar { display: none; }

#project-titles-list {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  position: relative;
  
  /* İÇ BOŞLUK: */
  /* Maskeleme alanından kurtarmak için */
  padding-top: 10rem; 
  padding-bottom: 10rem;
}

/* BACK BUTTON */
.back-btn {
  position: absolute;
  /* padding-top içinde, başlığın üstünde */
  top: 7rem; 
  left: 0;
  
  color: #000;
  opacity: 1;
  font-weight: 700;
  cursor: pointer;
  z-index: 9999;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: opacity 0.3s;
  pointer-events: auto;
}
.back-btn:hover { opacity: 0.6; }

/* LISTE ELEMANLARI */
.title-item {
  font-size: 0.8rem;
  font-weight: 600;
  color: #bbb;
  cursor: pointer;
  transition: all 0.3s;
  text-transform: uppercase;
  width: fit-content;
  position: relative;
  padding: 1px 0;
}
.title-item:hover, .title-item.active { color: #000; }
.title-item.active::after {
  content: ' ▶';
  font-size: 0.5rem;
  position: absolute;
  right: -15px; top: 3px;
  opacity: 1;
}

.list-section-header {
  font-size: 0.7rem;
  font-weight: 700;
  color: #000;
  margin-top: 2rem; 
  margin-bottom: 0.5rem;
  padding-bottom: 0.2rem;
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 1; 
  pointer-events: none;
}
.list-section-header:first-child { margin-top: 0; }
.list-section-header .line {
  flex-grow: 0.5;
  height: 1px;
  background: #000;
  opacity: 0.2;
}

/* Diğer sayfalar */
#view-about, #view-contact {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 400; background: #fff; 
  display: flex; justify-content: center; align-items: center;
  opacity: 0; visibility: hidden; transition: opacity 0.5s ease, visibility 0.5s;
  overflow-y: auto;
}
#view-about.active, #view-contact.active { opacity: 1; visibility: visible; }
.about-container { width: 100%; max-width: 1600px; height: 100%; display: flex; flex-direction: column; justify-content: center; padding: 140px 3rem 3rem 3rem; transform: scale(0.95); transition: transform 0.8s var(--ease-standard); }
#view-about.active .about-container { transform: scale(1); }
.about-grid { display: grid; grid-template-columns: 1.2fr 2fr 1.5fr; gap: 4rem; margin-bottom: auto; }
.about-grid h3 { font-size: 0.75rem; color: #999; margin-bottom: 1.5rem; letter-spacing: 0.5px; text-transform: uppercase; }
.col-bio p { font-size: 1.1rem; line-height: 1.4; font-weight: 600; max-width: 400px; }
.client-list { list-style: none; }
.client-list li { font-size: 1.1rem; line-height: 1.5; margin-bottom: 0.8rem; font-weight: 500; color: #555; }
.client-list li span { font-weight: 700; color: #000; }
.col-awards { display: flex; gap: 3rem; }
.award-group ul { list-style: none; }
.award-group li { font-size: 0.9rem; font-weight: 700; margin-bottom: 0.5rem; display: flex; justify-content: space-between; min-width: 120px; }
.award-group li span { color: #999; }
.about-footer-row { display: flex; justify-content: space-between; align-items: flex-end; margin-top: 5rem; font-size: 0.85rem; font-weight: 700; }
.socials { color: #999; margin-left: 10px; }
#about-content, #contact-content { text-align: center; max-width: 800px; padding: 2rem; transform: scale(0.95); transition: transform 0.8s var(--ease-standard); }

/* DETAY PANELİ */
#project-detail-panel {
  position: fixed; top: 0; right: 0; height: 100%; width: 60%; 
  background: #fff; z-index: 200; overflow-y: auto;
  padding: 160px 2rem 4rem 2rem; 
  opacity: 0; pointer-events: none; transform: translateX(50px); 
  transition: opacity 0.5s ease, transform 0.6s var(--ease-standard);
}
#project-detail-panel.active { opacity: 1; pointer-events: auto; transform: translateX(0); }
#project-detail-panel img { max-width: 100%; height: auto; display: block; margin-bottom: 2rem; }
#project-detail-panel h1 { font-size: 3rem; margin-bottom: 1rem; }
#project-detail-panel p { font-size: 1rem; line-height: 1.6; margin-bottom: 2rem; }
.hidden-grid { opacity: 0; pointer-events: none; transition: opacity 0.4s; }
.view { opacity: 0; visibility: hidden; transition: opacity 0.5s; }
.view.active { opacity: 1; visibility: visible; }

@media (max-width: 768px) {

  /* 1. HEADER & İSİM */
  #main-header {
    height: auto;
    width: auto;
    top: 1.5rem;
    right: 1.5rem;
    left: auto;
    transform: none !important;
    padding: 0;
    justify-content: flex-end;
    background: transparent;
    pointer-events: auto;
  }
  
  .nav-track { gap: 15px; }
  .nav-item { font-size: 0.85rem !important; opacity: 0.5; font-weight: 600; }
  .nav-item.active { opacity: 1; letter-spacing: normal; font-size: 0.85rem !important; }

  .site-footer {
    top: 1.5rem;
    left: 1.5rem;
    bottom: auto;
    font-size: 1rem;
    font-weight: 700;
    z-index: 600;
    display: block !important;
  }

  /* 2. ANA YAPI (WORKS) - FIX BURADA */
  #view-works {
    display: flex;
    flex-direction: row;
    padding: 0;
    padding-top: 0;
    /* vh yerine dvh kullanıyoruz. Tarayıcı çubuklarını hesaba katar. */
    height: 100dvh; 
    height: 100vh; /* Fallback */
    overflow: hidden; /* Dışarı taşmayı engelle */
    
    /* Android'de "pull-to-refresh" yaylanmasını engeller */
    overscroll-behavior: none; 
  }

  /* SOL ALAN (Resimler) */
  .zone-left {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    
    /* GÜNCELLEME BURADA: */
    /* Üstten %45 boşluk (İlk resim ortada başlasın) */
    padding-top: 45vh; 
    
    /* Alttan %55 boşluk (Son resim ekranın ortasını rahatça geçebilsin) */
    padding-bottom: 55vh; 
    
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch; 
    overscroll-behavior-y: contain;
  }
  .zone-left::-webkit-scrollbar { display: none; }

  /* MENÜ (SAĞ ALT) */
  .zone-middle {
    position: fixed !important; 
    bottom: 2rem; /* Alttan biraz pay bırak */
    /* Samsung Internet'te alt bar varsa 2rem yukarıda kalsın */
    bottom: calc(2rem + env(safe-area-inset-bottom)); 
    right: 1.5rem;
    top: auto; left: auto;
    width: auto;
    height: auto;
    z-index: 999;
    padding: 0;
    pointer-events: none;
    display: flex;
    justify-content: flex-end;
    background: transparent;
  }

  .sticky-wrapper {
    position: relative;
    top: auto;
    height: auto;
    overflow: visible;
    mask-image: none;
    -webkit-mask-image: none;
  }

  /* Diğer stiller aynen kalabilir */
  #project-titles-list {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.3rem;
    padding: 0;
  }

  .title-item {
    font-size: 0.75rem;
    color: #aaa;
    text-transform: uppercase;
    pointer-events: auto; 
    text-align: right;
    transition: color 0.3s;
  }
  .title-item.active {
    color: #000;
    font-weight: 700;
    font-size: 0.75rem;
  }
  .title-item.active::after { display: none; }

  .zone-right { display: none; }
  .list-section-header { display: none; } 
  #project-titles-list .back-btn { display: none !important; }

  .mobile-back-btn {
    display: block;
    margin-bottom: 2rem;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    color: #000;
    opacity: 0.6;
  }

  .mobile-project-wrapper {
    margin-bottom: 4rem;
    position: relative;
  }
  
  .project-number {
    font-size: 0.9rem;
    font-weight: 700;
    color: #000;
    margin-bottom: 0.5rem;
    display: block;
  }

  .work-img {
    width: 100%; 
    max-width: 400px;
    height: auto;
    object-fit: cover;
    display: block;
  }

  /* ABOUT DÜZELTME */
  #view-about {
    /* dvh kullanımı önemli */
    height: 100dvh; 
    padding: 100px 1.5rem 2rem 1.5rem !important;
    overflow-y: auto;
    display: block;
    -webkit-overflow-scrolling: touch;
  }
  /* ... about container stilleri ... */
  #view-about .about-container { padding: 0 !important; width: 100% !important; display: block !important; }
  #view-about .about-grid { display: flex !important; flex-direction: column !important; gap: 3rem !important; grid-template-columns: 1fr !important; }
  #view-about .col-bio, #view-about .col-clients, #view-about .col-awards { width: 100% !important; max-width: 100% !important; }
  .col-bio p { font-size: 1.1rem; line-height: 1.5; }
  .about-footer-row { flex-direction: column; align-items: flex-start; margin-top: 3rem; gap: 1rem; padding-bottom: 2rem; }
}