:root {
  /* Colors */
  --color-primary: #D32F2F; /* Premium Kurumsal Kırmızı */
  --color-primary-dark: #B71C1C;
  --color-dark: #1A1A1A; /* Architectural off-black */
  --color-darker: #0D0D0D;
  --color-light: #F4F4F4;
  --color-white: #FFFFFF;
  --color-gray: #888888;
  --color-gray-light: #E5E5E5;
  
  /* Typography */
  --font-heading: 'Cinzel', serif;
  --font-body: 'Inter', sans-serif;
  
  /* Transitions */
  --transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

body {
  font-family: var(--font-body);
  color: var(--color-dark);
  background-color: var(--color-white);
  line-height: 1.7;
  font-size: 0.95rem; /* Smaller, elegant base font */
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .logo-text, .hero-subtitle, .subtitle {
  font-family: var(--font-heading);
  font-weight: 400; /* Thinner weights for elegance */
}

a { text-decoration: none; color: inherit; }

.container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 5%;
}

.section-padding { padding: 8rem 0; }
.bg-light { background-color: var(--color-light); }
.bg-dark { background-color: var(--color-darker); color: var(--color-white); }
.bg-dark .section-title { color: var(--color-white); }

/* Typography */
.section-title {
  font-size: 2.4rem;
  color: var(--color-dark);
  margin-bottom: 2rem;
  font-weight: 500;
  letter-spacing: 1px;
  line-height: 1.3;
}
.section-title span { color: var(--color-gray); font-style: italic; font-weight: 300; }
.subtitle {
  color: var(--color-primary);
  font-size: 0.75rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.8rem;
  font-family: var(--font-body);
  font-weight: 600;
}
.text-center { text-align: center; }
.lead-text {
  font-size: 1.1rem;
  color: var(--color-gray);
  max-width: 800px;
  margin: 0 auto 3rem;
  font-weight: 300;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2.5rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: 500;
}
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}
.btn-primary:hover {
  background-color: var(--color-dark);
  color: var(--color-white);
}
.btn-outline {
  border-color: var(--color-dark);
  color: var(--color-dark);
  background: transparent;
}
.btn-outline:hover {
  background-color: var(--color-dark);
  color: var(--color-white);
}
.bg-dark .btn-outline {
  border-color: var(--color-white);
  color: var(--color-white);
}
.bg-dark .btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-dark);
}
.btn-link {
  color: var(--color-primary);
  font-weight: 500;
  border-bottom: 1px solid var(--color-primary);
  padding: 0 0 0.2rem 0;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 1px;
}
.btn-link:hover {
  color: var(--color-dark);
  border-color: var(--color-dark);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0; left: 0; width: 100%;
  z-index: 1000;
  padding: 1.5rem 0;
  transition: var(--transition);
  background-color: transparent;
}
.navbar.scrolled, .navbar.solid-bg {
  background-color: var(--color-darker);
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  display: flex; align-items: center; gap: 0.5rem;
}
.logo-text {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--color-white);
}
.logo-accent { color: var(--color-primary); font-weight: 300;}
.nav-links {
  display: flex;
  gap: 2.2rem;
  align-items: center;
}
.nav-link {
  color: var(--color-white);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  position: relative;
  opacity: 0.8;
  padding-bottom: 0.2rem;
  font-weight: 500;
}
.nav-link:hover, .nav-link.active { opacity: 1; }
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; width: 0; height: 1px;
  background-color: var(--color-primary);
  transition: var(--transition);
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.navbar .btn-outline {
  border-color: rgba(255,255,255,0.3);
  color: var(--color-white);
  padding: 0.6rem 1.5rem;
  font-size: 0.75rem;
}
.navbar .btn-outline:hover { background-color: var(--color-primary); border-color: var(--color-primary); }

/* Hero */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  color: var(--color-white);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  animation: slowZoom 20s infinite alternate;
  z-index: -2;
}
.hero-overlay {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.6);
  z-index: -1;
}
.hero-content {
  position: relative;
  max-width: 800px;
  z-index: 2;
  margin-top: 5rem;
}
.hero-title {
  font-size: 4rem;
  line-height: 1.15;
  margin-bottom: 2rem;
  font-weight: 300;
}
.hero-description {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 3rem;
  font-family: var(--font-body);
  max-width: 600px;
  font-weight: 300;
}

/* Page Header */
.page-header {
  height: 45vh;
  min-height: 400px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  color: var(--color-white);
  margin-bottom: 0;
  padding-top: 5rem;
}
.page-header-bg {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background-color: #1a1a1a;
  background-size: cover;
  background-position: center;
  z-index: -2;
  transform: scale(1.05);
  filter: grayscale(100%); /* İstenen tüm kırmızı/renkli tonları gri yapar */
  animation: slowZoom 25s infinite alternate;
}
.page-header-overlay {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background: linear-gradient(to top, rgba(20,20,20,0.95) 0%, rgba(20,20,20,0.6) 100%);
  z-index: -1;
  transform: scale(1.05);
  animation: slowZoom 25s infinite alternate; /* Renkli alanın fotoğrafla aynı animasyonu yapması için */
}
.page-title {
  font-size: 3.2rem;
  font-weight: 300;
  animation: fadeUp 1.2s cubic-bezier(0.2, 0.8, 0.2, 1) both;
  animation-delay: 0.2s;
}
.page-header .subtitle {
  animation: fadeUp 1.2s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

/* Split Section (Image Left, Text Right) */
.split-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}
.split-text h3 {
  font-size: 1.8rem;
  font-weight: 400;
  margin-bottom: 1.5rem;
}
.split-text p {
  color: var(--color-gray);
  margin-bottom: 1.5rem;
}
.split-image {
  position: relative;
  height: 600px;
  border-radius: 2px;
  overflow: hidden;
}
.split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}
.split-image:hover img {
  transform: scale(1.05);
}
.split-image::after {
  content: '';
  position: absolute;
  bottom: -20px; right: -20px;
  width: 200px; height: 200px;
  border-right: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  z-index: -1;
}

/* Grids */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }

/* Elegant Cards */
.modern-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-light);
  padding: 3rem 2.5rem;
  transition: var(--transition);
}
.modern-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.06);
  border-color: transparent;
}
.icon-box {
  width: 50px; height: 50px;
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: flex-start;
  font-size: 2rem;
  margin-bottom: 1.5rem;
}
.modern-card h3 { font-size: 1.3rem; margin-bottom: 1rem; font-weight: 500; }
.modern-card p { color: var(--color-gray); font-size: 0.9rem; }

/* Project Cards */
.project-card {
  position: relative;
  display: block;
  overflow: hidden;
  height: 500px;
}
.project-img {
  width: 100%; height: 100%;
  background-size: cover; background-position: center;
  transition: transform 0.8s ease;
}
.project-info {
  position: absolute;
  bottom: 0; left: 0; width: 100%;
  padding: 3rem 2rem;
  background: linear-gradient(to top, rgba(13,13,13,0.95), transparent);
  color: var(--color-white);
}
.project-info h3 { font-size: 1.5rem; margin-bottom: 0.3rem; transform: translateY(15px); transition: var(--transition); font-weight: 400;}
.project-category { color: var(--color-primary); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 2px; }
.project-card:hover .project-img { transform: scale(1.05); }
.project-card:hover .project-info h3 { transform: translateY(0); }

/* Value/Stats Block */
.stats-wrap {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--color-gray-light);
  border-bottom: 1px solid var(--color-gray-light);
  padding: 4rem 0;
}
.stat-box { text-align: center; }
.stat-box h4 { font-size: 3.5rem; color: var(--color-dark); line-height: 1; font-weight: 300; }
.stat-box p { color: var(--color-gray); text-transform: uppercase; letter-spacing: 2px; font-size: 0.75rem; margin-top: 1rem; }

/* Filter Tabs */
.filter-tabs {
  display: flex; justify-content: center; gap: 2rem; margin-bottom: 4rem;
}
.filter-btn {
  background: none; border: none; cursor: pointer;
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px;
  color: var(--color-gray); transition: var(--transition);
  padding-bottom: 0.5rem;
  font-family: var(--font-body);
  font-weight: 500;
}
.filter-btn.active, .filter-btn:hover { color: var(--color-dark); border-bottom: 1px solid var(--color-dark); }

/* Process / Timeline */
.process-step { border-left: 1px solid var(--color-gray-light); padding-left: 2rem; position: relative; margin-bottom: 3rem; }
.process-step::before {
  content: ''; position: absolute; left: -6px; top: 0;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--color-primary);
}
.process-step h4 { font-size: 1.4rem; margin-bottom: 1rem; font-weight: 400;}
.process-step p { color: var(--color-gray); }

/* Team Section Premium */
.team-member {
  background: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
  transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.team-member:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 0 25px 50px rgba(211,47,47,0.18);
}
.team-img-wrap {
  height: 350px;
  overflow: hidden;
}
.team-img-content {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center top;
  transition: transform 0.6s ease;
}
.team-member:hover .team-img-content {
  transform: scale(1.08);
}
.team-info {
  padding: 1.8rem 1rem;
  text-align: center;
  background: #fff;
  border-top: 4px solid var(--color-primary);
}
.team-title { font-size: 1.25rem; font-weight: 500; margin-bottom: 0.3rem; color: var(--color-dark); }
.team-role { color: var(--color-primary); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px; font-weight: 600; }

/* Footer */
.footer {
  background: #0A0A0A;
  color: rgba(255,255,255,0.6);
  padding: 6rem 0 2rem;
  font-size: 0.85rem;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 4rem;
  margin-bottom: 5rem;
}
.footer h4 { color: var(--color-white); font-size: 1rem; margin-bottom: 1.5rem; letter-spacing: 1px; font-weight: 400; font-family: var(--font-heading); }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 0.8rem; }
.footer ul a { transition: var(--transition); }
.footer ul a:hover { color: var(--color-primary); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 2rem; text-align: center; }

@keyframes slowZoom { from { transform: scale(1); } to { transform: scale(1.1); } }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(50px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Contact Section Premium */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  box-shadow: 0 40px 80px rgba(0,0,0,0.06);
  border-radius: 2px;
  overflow: hidden;
  margin-top: -5rem;
  position: relative;
  z-index: 10;
  background: var(--color-white);
}
.contact-form-container {
  padding: 6rem 5rem;
  background: var(--color-white);
}
.contact-form-container h3 {
  font-size: 2rem;
  font-family: var(--font-heading);
  margin-bottom: 3rem;
  font-weight: 300;
  color: var(--color-dark);
  letter-spacing: 1px;
}
.form-group {
  margin-bottom: 2.5rem;
}
.form-control {
  width: 100%;
  padding: 1rem 0;
  border: none;
  border-bottom: 1px solid var(--color-gray-light);
  background-color: transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-dark);
  transition: var(--transition);
}
.form-control:focus {
  outline: none;
  border-bottom-color: var(--color-primary);
  box-shadow: 0 2px 0 0 rgba(188, 163, 127, 0.1);
}
.form-control::placeholder {
  color: var(--color-gray);
  font-weight: 400;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 1.5px;
}
textarea.form-control {
  min-height: 120px;
  resize: vertical;
}
.contact-map {
  width: 100%;
  height: 100%;
  min-height: 600px;
}
.contact-map iframe {
  width: 100%;
  height: 100%;
  border: none;
  filter: grayscale(80%) contrast(1.1) opacity(0.9);
}

/* Responsive Framework */
@media(max-width: 1200px) {
  .hero-title { font-size: 3.5rem; }
  .container { padding: 0 4%; }
}

@media(max-width: 992px) {
  .contact-grid { grid-template-columns: 1fr; margin-top: -2rem; }
  .contact-form-container { padding: 3rem 2rem; }
  .contact-map { min-height: 400px; }
  .hero-title { font-size: 2.8rem; }
  
  /* Tablet Grid Fixes */
  .split-content { grid-template-columns: 1fr; gap: 3rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  
  .split-image { height: 400px; }
  .stats-wrap { flex-direction: column; gap: 3rem; text-align: center; }
  .footer-top { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
  
  /* Mobile Hamburger Menu */
  .mobile-toggle { display: block !important; }
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 300px; height: 100vh;
    background: var(--color-darker);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: right 0.4s ease;
    z-index: 1000;
  }
  .nav-links.active { right: 0; box-shadow: -5px 0 20px rgba(0,0,0,0.5); }
  .nav-links .nav-link { font-size: 1.1rem; margin-bottom: 2rem; }
}

@media(max-width: 768px) {
  /* Mobile Grid Restrict */
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section-padding { padding: 4rem 0; }
  
  .hero-title { font-size: 2.2rem; }
  .page-title { font-size: 2.2rem; }
  .section-title { font-size: 1.8rem; }
  
  .footer-top { grid-template-columns: 1fr; }
  .filter-tabs { flex-wrap: wrap; gap: 1rem; }
  .team-img-wrap { height: 300px; }
  .hero { min-height: 500px; }
  .page-header { min-height: 300px; padding-top: 6rem; }
}

/* Scroll Reveal Animations */
.reveal {
  opacity: 0;
  transform: translateY(45px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}
.grid-2 .reveal:nth-child(1), .grid-3 .reveal:nth-child(1), .grid-4 .reveal:nth-child(1) { transition-delay: 0.05s; }
.grid-2 .reveal:nth-child(2), .grid-3 .reveal:nth-child(2), .grid-4 .reveal:nth-child(2) { transition-delay: 0.15s; }
.grid-3 .reveal:nth-child(3), .grid-4 .reveal:nth-child(3) { transition-delay: 0.25s; }
.grid-4 .reveal:nth-child(4) { transition-delay: 0.35s; }
.grid-4 .reveal:nth-child(5) { transition-delay: 0.45s; }
.grid-4 .reveal:nth-child(6) { transition-delay: 0.55s; }