/* ===================================================
   BARVA GAZ - Ana CSS Dosyası
   Modern, Kurumsal, Responsive Tasarım
   =================================================== */

/* --- CSS Variables --- */
:root {
  /* Ana marka kırmızısı (aksan) */
  --color-primary:       #B20D24;
  --color-primary-dark:  #8a0a1c;
  --color-primary-light: #d4102c;

  /* Ege mavi paleti */
  --color-aegean:        #0096C7;
  --color-aegean-dark:   #023E8A;
  --color-aegean-deep:   #03045E;
  --color-aegean-light:  #48CAE4;
  --color-aegean-sky:    #90E0EF;
  --color-aegean-mist:   #CAF0F8;

  /* Koyu arka planlar */
  --color-dark:     #03045E;
  --color-dark-alt: #023E8A;

  /* Açık tona */
  --color-light:      #F0F8FF;
  --color-white:      #ffffff;
  --color-gray:       #64748b;
  --color-gray-light: #e2eaf3;
  --color-text:       #1e293b;
  --color-text-light: #475569;

  --font-primary: 'Outfit', 'Poppins', sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  --border-radius: 8px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.12), 0 6px 10px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);

  --transition: all 0.3s ease;
  --transition-fast: all 0.15s ease;
  --transition-slow: all 0.5s ease;

  --header-height: 80px;
  --topbar-height: 40px;
  --container-max: 1280px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background-color: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-primary);
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
}

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* --- Section Styles --- */
.section {
  padding: var(--spacing-3xl) 0;
}

.section-alt {
  background-color: var(--color-light);
}

.section-dark {
  background: linear-gradient(160deg, var(--color-aegean-deep) 0%, var(--color-dark) 100%);
  color: var(--color-white);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-header .subtitle {`n  display: inline-block;`n  color: var(--color-aegean);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-xs);
}

.section-header h2 {
  font-size: var(--font-size-3xl);
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

.section-dark .section-header h2 {
  color: var(--color-white);
}

.section-header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

.section-dark .section-header p {
  color: rgba(255,255,255,0.7);
}

.section-divider {
  width: 60px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 2px;
  margin: var(--spacing-sm) auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.75rem;
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: var(--font-primary);
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(178, 13, 36, 0.4);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-outline-dark {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline-dark:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: var(--font-size-lg);
}

/* ===================================================
   TOP BAR
   =================================================== */
.topbar {
  background: linear-gradient(90deg, var(--color-aegean-dark) 0%, var(--color-aegean) 100%);
  color: rgba(255,255,255,0.92);
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  font-size: var(--font-size-sm);
  position: relative;
  z-index: 1001;
}

.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.topbar-info {
  display: flex;
  gap: var(--spacing-md);
}

.topbar-info a {
  color: rgba(255,255,255,0.9);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-fast);
}

.topbar-info a:hover {
  color: var(--color-aegean-mist);
}

.topbar-info i {
  color: var(--color-aegean-sky);
  font-size: 12px;
}

.topbar-social {
  display: flex;
  gap: var(--spacing-sm);
}

.topbar-social a {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition-fast);
}

.topbar-social a:hover {
  color: white;
  background: rgba(255,255,255,0.15);
}

/* ===================================================
   HEADER & NAVIGATION
   =================================================== */
.header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  height: var(--header-height);
  display: flex;
  align-items: center;
  box-shadow: 0 2px 20px rgba(0, 150, 199, 0.08);
  transition: var(--transition);
  border-bottom: 1px solid rgba(72,202,228,0.2);
}

.header.scrolled {
  box-shadow: 0 4px 30px rgba(2, 62, 138, 0.14);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: rgba(72, 202, 228, 0.3);
  height: 68px;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo img {
  height: 64px;
  width: auto;
  transition: var(--transition);
  filter: drop-shadow(0 2px 10px rgba(0,150,199,0.4));
}

.header.scrolled .logo img {
  height: 52px;
  filter: drop-shadow(0 1px 6px rgba(0,150,199,0.3));
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0.65rem 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-aegean-dark);
  border-radius: var(--border-radius);
  transition: var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.3px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-aegean);
  background: linear-gradient(135deg, rgba(0,150,199,0.08), rgba(72,202,228,0.06));
}

.nav-link.active {
  color: var(--color-aegean);
}

.nav-link i.fa-chevron-down {
  font-size: 9px;
  transition: transform 0.25s ease;
  color: var(--color-aegean-light);
}

.nav-item:hover > .nav-link i.fa-chevron-down {
  transform: rotate(180deg);
}

/* Dropdown */
.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 230px;
  background: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 40px rgba(2,62,138,0.14);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition);
  border-top: 3px solid var(--color-aegean);
  z-index: 999;
  overflow: hidden;
}

.nav-item:hover > .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0.65rem 1.2rem;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  transition: var(--transition-fast);
  border-left: 3px solid transparent;
}

.dropdown-link:hover {
  color: var(--color-aegean);
  background: linear-gradient(90deg, rgba(0,150,199,0.06), transparent);
  border-left-color: var(--color-aegean);
  padding-left: 1.5rem;
}

.dropdown-link i {
  color: var(--color-aegean);
  width: 16px;
  font-size: 12px;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: var(--border-radius);
  transition: var(--transition-fast);
}

.hamburger:hover {
  background: var(--color-light);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-aegean-dark);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background-color: var(--color-aegean);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background-color: var(--color-aegean);
}

/* ===================================================
   HERO SLIDER
   =================================================== */
.hero-slider {
  position: relative;
  width: 100%;
  height: calc(100vh - var(--header-height) - var(--topbar-height));
  min-height: 500px;
  max-height: 850px;
  overflow: hidden;
  background-color: var(--color-dark);
}

.slides-wrapper {
  display: flex;
  height: 100%;
  transition: transform 0.7s cubic-bezier(0.77, 0, 0.175, 1);
  will-change: transform;
}

.slide {
  position: relative;
  min-width: 100%;
  height: 100%;
  overflow: hidden;
}

.slide-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 8s ease;
}

.slide.active .slide-img {
  transform: scale(1.05);
}

.slide-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(2, 62, 138, 0.72) 0%,
    rgba(0, 150, 199, 0.35) 60%,
    rgba(3, 4, 94, 0.5) 100%
  );
}

.slide-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 var(--spacing-lg);
  color: var(--color-white);
}

.slide-tag {
  display: inline-block;
  background: linear-gradient(90deg, var(--color-aegean), var(--color-aegean-light));
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  padding: 0.35rem 1.2rem;
  border-radius: 20px;
  margin-bottom: var(--spacing-sm);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease 0.2s, transform 0.6s ease 0.2s;
  box-shadow: 0 4px 15px rgba(0,150,199,0.4);
}

.slide-content h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-sm);
  max-width: 800px;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease 0.4s, transform 0.6s ease 0.4s;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.slide-content p {
  font-size: clamp(1rem, 2vw, 1.3rem);
  opacity: 0;
  transform: translateY(20px);
  max-width: 600px;
  transition: opacity 0.6s ease 0.6s, transform 0.6s ease 0.6s;
  color: rgba(255,255,255,0.9);
  margin-bottom: var(--spacing-md);
}

.slide-cta {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  justify-content: center;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease 0.8s, transform 0.6s ease 0.8s;
}

.slide.active .slide-tag,
.slide.active .slide-content h1,
.slide.active .slide-content p,
.slide.active .slide-cta {
  opacity: 1;
  transform: translateY(0);
}

/* Slider Controls */
.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 58px;
  height: 58px;
  background: rgba(0,0,0,0.25);
  color: var(--color-white);
  border: 2px solid rgba(72,202,228,0.55);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  cursor: pointer;
  z-index: 10;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.1);
}

.slider-btn:hover {
  background: var(--color-aegean);
  border-color: var(--color-aegean-light);
  transform: translateY(-50%) scale(1.08);
  box-shadow: 0 6px 25px rgba(0,150,199,0.5), inset 0 1px 0 rgba(255,255,255,0.15);
}

.slider-prev { left: var(--spacing-md); }
.slider-next { right: var(--spacing-md); }

/* Slider Dots */
.slider-dots {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  align-items: center;
  z-index: 10;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  cursor: pointer;
  transition: all 0.4s ease;
  border: 1.5px solid rgba(255,255,255,0.5);
}

.dot.active {
  background: var(--color-aegean-light);
  width: 32px;
  border-radius: 4px;
  border-color: var(--color-aegean-light);
  box-shadow: 0 0 12px rgba(72,202,228,0.7);
}

.dot:hover:not(.active) {
  background: rgba(255,255,255,0.65);
  transform: scale(1.2);
}

/* ===================================================
   STATS SECTION
   =================================================== */
.stats-section {
  background: linear-gradient(135deg, var(--color-aegean-dark) 0%, var(--color-aegean) 60%, var(--color-aegean-light) 100%);
  padding: var(--spacing-xl) 0;
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  left: -100px;
  top: -100px;
  width: 350px;
  height: 350px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
}

.stats-section::after {
  content: '';
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-lg);
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: rgba(255,255,255,0.1);
}

.stat-icon {
  width: 60px;
  height: 60px;
  background: rgba(255,255,255,0.15);
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-sm);
  font-size: 1.4rem;
  color: white;
  transition: var(--transition);
}

.stat-item:hover .stat-icon {
  background: rgba(255,255,255,0.25);
  color: var(--color-white);
  transform: scale(1.1);
}

.stat-number {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stat-number span {
  color: var(--color-aegean-mist);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.75);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===================================================
   SERVICES SECTION
   =================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.service-card {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.service-card-top {
  height: 6px;
  background: linear-gradient(90deg, var(--color-aegean-light), var(--color-aegean-mist));
  transition: var(--transition);
}

.service-card:hover .service-card-top {
  background: linear-gradient(90deg, var(--color-aegean), var(--color-aegean-light));
}

.service-card-body {
  padding: var(--spacing-xl) var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.service-icon-wrap {
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, rgba(0,150,199,0.1), rgba(72,202,228,0.08));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--color-aegean);
  margin-bottom: var(--spacing-md);
  transition: var(--transition);
}

.service-card:hover .service-icon-wrap {
  background: linear-gradient(135deg, var(--color-aegean), var(--color-aegean-light));
  color: var(--color-white);
}

.service-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
}

.service-card p {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  flex: 1;
  margin-bottom: var(--spacing-md);
}

/* ===================================================
   ABOUT SECTION
   =================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about-image-wrap {
  position: relative;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
}

.about-image-wrap img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  border-radius: var(--border-radius-xl);
  transition: transform 0.5s ease;
}

.about-image-wrap:hover img {
  transform: scale(1.03);
}

.about-image-badge {
  position: absolute;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  text-align: center;
  backdrop-filter: blur(4px);
  box-shadow: 0 8px 32px rgba(178, 13, 36, 0.4);
}

.about-image-badge .badge-num {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
}

.about-image-badge .badge-text {
  font-size: 0.75rem;
  opacity: 0.9;
  font-weight: 500;
}

.about-content .subtitle {
  display: inline-block;
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-xs);
}

.about-content h2 {
  font-size: var(--font-size-3xl);
  color: var(--color-dark);
  margin-bottom: var(--spacing-md);
  line-height: 1.25;
}

.about-content p {
  color: var(--color-text-light);
  font-size: var(--font-size-base);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
  margin: var(--spacing-lg) 0;
}

.about-feature {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.about-feature i {
  color: var(--color-primary);
  margin-top: 3px;
  font-size: 14px;
}

.about-feature span {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-weight: 500;
}

/* ===================================================
   WHY US SECTION
   =================================================== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.why-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.why-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.why-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(178, 13, 36, 0.3);
  transform: translateY(-4px);
}

.why-card:hover::before {
  transform: scaleX(1);
}

.why-card-icon {
  width: 56px;
  height: 56px;
  background: rgba(178, 13, 36, 0.15);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  transition: var(--transition);
}

.why-card:hover .why-card-icon {
  background: var(--color-primary);
  color: var(--color-white);
}

.why-card h3 {
  font-size: var(--font-size-lg);
  color: var(--color-white);
  margin-bottom: var(--spacing-xs);
}

.why-card p {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
}

/* ===================================================
   CTA BANNER
   =================================================== */
.cta-banner {
  background: linear-gradient(135deg, var(--color-aegean-dark) 0%, var(--color-aegean) 60%, var(--color-aegean-light) 100%);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
  padding: var(--spacing-3xl) 0;
}

.cta-text h2 {
  font-size: var(--font-size-3xl);
  color: var(--color-white);
  margin-bottom: var(--spacing-xs);
}

.cta-text p {
  color: rgba(255,255,255,0.85);
  font-size: var(--font-size-lg);
}

.cta-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-shrink: 0;
  flex-wrap: wrap;
}

/* ===================================================
   FOOTER
   =================================================== */
.footer {
  background: linear-gradient(180deg, var(--color-aegean-deep) 0%, #020318 100%);
  color: rgba(255,255,255,0.75);
  padding-top: var(--spacing-3xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr;
  gap: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
}

.footer-about .footer-logo img {
  height: 72px;
  margin-bottom: var(--spacing-md);
  filter: drop-shadow(0 2px 12px rgba(0,150,199,0.4));
  opacity: 1;
}

.footer-about p {
  font-size: var(--font-size-sm);
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
  margin-bottom: var(--spacing-md);
}

.footer-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  position: relative;
  padding-bottom: 10px;
}

.footer-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-aegean), var(--color-aegean-light));
  border-radius: 2px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary);
  padding-left: 4px;
}

.footer-links a i {
  color: var(--color-primary);
  font-size: 10px;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.footer-contact-item i {
  color: var(--color-primary);
  margin-top: 3px;
  font-size: 14px;
  flex-shrink: 0;
}

.footer-contact-item span, 
.footer-contact-item a {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
}

.footer-contact-item a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: var(--spacing-md) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.4);
}

.footer-bottom a {
  color: var(--color-primary);
}

/* ===================================================
   PAGE HEADER / BREADCRUMB
   =================================================== */


.page-header {
  background: linear-gradient(135deg, var(--color-aegean-dark) 0%, var(--color-aegean) 60%, var(--color-aegean-light) 100%);
  padding: var(--spacing-3xl) 0;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  left: -60px; bottom: -60px;
  width: 300px; height: 300px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
}

.page-header::after {
  content: '';
  position: absolute;
  right: -80px;
  top: -80px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(178, 13, 36, 0.08);
}

.page-header-content {
  position: relative;
  z-index: 1;
}

.page-header h1 {
  font-size: var(--font-size-4xl);
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.5);
}

.breadcrumb a {
  color: rgba(255,255,255,0.6);
  transition: var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--color-aegean-mist);
}

.breadcrumb i {
  font-size: 10px;
}

.breadcrumb span {
  color: var(--color-aegean-sky);
}

/* ===================================================
   GAS CARDS (Endüstriyel Gazlar)
   =================================================== */
.gas-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.gas-card {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--color-gray-light);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.gas-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 12px 40px rgba(178, 13, 36, 0.12);
  transform: translateY(-6px);
}

.gas-card-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto var(--spacing-md);
  transition: var(--transition);
}

.gas-card:hover .gas-card-icon {
  transform: scale(1.1) rotate(5deg);
}

.gas-card h3 {
  font-size: var(--font-size-lg);
  color: var(--color-dark);
  margin-bottom: var(--spacing-xs);
}

.gas-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
  flex: 1;
  margin-bottom: var(--spacing-md);
}

/* Gas icon color themes */
.gas-oksijen .gas-card-icon { background: rgba(14, 165, 233, 0.1); color: #0ea5e9; }
.gas-azot .gas-card-icon { background: rgba(99, 102, 241, 0.1); color: #6366f1; }
.gas-argon .gas-card-icon { background: rgba(16, 185, 129, 0.1); color: #10b981; }
.gas-karbondioksit .gas-card-icon { background: rgba(245, 158, 11, 0.1); color: #f59e0b; }
.gas-asetilen .gas-card-icon { background: rgba(239, 68, 68, 0.1); color: #ef4444; }
.gas-hidrojen .gas-card-icon { background: rgba(236, 72, 153, 0.1); color: #ec4899; }
.gas-helyum .gas-card-icon { background: rgba(14, 165, 233, 0.12); color: #38bdf8; }

/* ===================================================
   CONTACT PAGE
   =================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.contact-info-card {
  background: var(--color-dark-alt);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  color: var(--color-white);
}

.contact-info-card h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-xs);
}

.contact-info-card > p {
  color: rgba(255,255,255,0.6);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xl);
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.contact-item {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.contact-item-icon {
  width: 48px;
  height: 48px;
  background: rgba(178, 13, 36, 0.15);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-item-text h4 {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.5);
  font-weight: 400;
  margin-bottom: 2px;
}

.contact-item-text p,
.contact-item-text a {
  font-size: var(--font-size-base);
  color: var(--color-white);
  font-weight: 500;
}

.contact-item-text a:hover {
  color: var(--color-primary);
}

.map-embed {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  margin-top: var(--spacing-md);
}

.map-embed iframe {
  width: 100%;
  height: 220px;
  border: none;
  display: block;
}

/* Contact Form */
.contact-form-card {
  background: var(--color-white);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-gray-light);
}

.contact-form-card h3 {
  font-size: var(--font-size-2xl);
  color: var(--color-dark);
  margin-bottom: var(--spacing-xs);
}

.contact-form-card > p {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xl);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 2px solid var(--color-gray-light);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  color: var(--color-text);
  background: var(--color-white);
  transition: var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(178, 13, 36, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

/* ===================================================
   ABOUT / VIZYON PAGE CONTENT
   =================================================== */
.content-section {
  padding: var(--spacing-3xl) 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.content-image {
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.content-image img {
  width: 100%;
  height: 450px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.content-image:hover img {
  transform: scale(1.03);
}

.content-text h2 {
  font-size: var(--font-size-3xl);
  color: var(--color-dark);
  margin-bottom: var(--spacing-md);
}

.content-text p {
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-base);
}

.content-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: var(--spacing-md) 0;
}

.content-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.content-list li i {
  color: var(--color-primary);
  margin-top: 3px;
  flex-shrink: 0;
}

/* Vizyon-Misyon Cards */
.vm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.vm-card {
  background: var(--color-white);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border-top: 5px solid var(--color-primary);
  transition: var(--transition);
}

.vm-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.vm-card-icon {
  width: 64px;
  height: 64px;
  background: rgba(178, 13, 36, 0.08);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.vm-card h3 {
  font-size: var(--font-size-xl);
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

.vm-card p {
  color: var(--color-text-light);
  line-height: 1.8;
  font-size: var(--font-size-sm);
}

.vm-card ul {
  margin-top: var(--spacing-sm);
}

.vm-card ul li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.vm-card ul li i {
  color: var(--color-primary);
  margin-top: 3px;
  font-size: 11px;
}

/* ===================================================
   ANIMATIONS
   =================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-fade-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-fade-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-fade-up.animated,
.animate-fade-left.animated,
.animate-fade-right.animated {
  opacity: 1;
  transform: translate(0);
}

.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }

/* ===================================================
   UTILITY CLASSES
   =================================================== */
.text-primary { color: var(--color-primary); }
.text-center { text-align: center; }
.text-white { color: var(--color-white); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.d-flex { display: flex; }
.align-center { align-items: center; }
.gap-sm { gap: var(--spacing-sm); }

/* ===================================================
   RESPONSIVE BREAKPOINTS
   =================================================== */

/* 1200px */
@media (max-width: 1200px) {
  :root {
    --container-max: 960px;
  }

  .gas-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-grid {
    gap: var(--spacing-2xl);
  }
}

/* 992px */
@media (max-width: 992px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.6rem;
  }

  .hamburger {
    display: flex;
  }

  .nav {
    position: fixed;
    top: calc(var(--topbar-height) + var(--header-height));
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    padding: var(--spacing-lg);
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform 0.35s ease;
    z-index: 999;
    border-top: 2px solid var(--color-gray-light);
  }

  .nav.open {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    justify-content: space-between;
    padding: 0.9rem var(--spacing-sm);
    border-bottom: 1px solid var(--color-gray-light);
    border-radius: 0;
  }

  .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    border-top: none;
    display: none;
    background: var(--color-light);
    border-radius: 0;
    padding: var(--spacing-xs) 0;
  }

  .dropdown.mobile-open {
    display: block;
  }

  .dropdown-link {
    padding-left: var(--spacing-xl);
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-image-wrap img {
    height: 350px;
  }

  .services-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .cta-content {
    flex-direction: column;
    text-align: center;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .content-grid {
    grid-template-columns: 1fr;
  }

  .vm-grid {
    grid-template-columns: 1fr;
  }

  .gas-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .why-grid {
    grid-template-columns: 1fr;
  }
}

/* 768px */
@media (max-width: 768px) {
  .topbar-info {
    flex-direction: column;
    gap: 2px;
    font-size: 11px;
  }

  .topbar {
    height: auto;
    padding: 6px 0;
  }

  .topbar-social {
    display: none;
  }

  .hero-slider {
    min-height: 400px;
    max-height: 600px;
    height: calc(100vh - 120px);
  }

  .slider-btn {
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .about-features {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-xs);
    text-align: center;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .content-image img {
    height: 300px;
  }
}

/* 576px */
@media (max-width: 576px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-item:not(:last-child)::after {
    display: none;
  }

  .gas-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-header h1 {
    font-size: var(--font-size-2xl);
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-slider {
    min-height: 350px;
  }

  .slide-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .slide-cta .btn {
    width: auto;
  }
}

/* ===================================================
   MEGA MENU — Görsel Dropdown
   =================================================== */
.nav-item.has-mega {
  position: static;
}

.mega-menu {
  position: fixed;
  top: calc(var(--topbar-height) + var(--header-height));
  left: 0;
  right: 0;
  width: 100%;
  background: var(--color-white);
  border-top: 3px solid var(--color-aegean);
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
  z-index: 998;
  padding: 2rem 0;
}

.header.scrolled ~ * .mega-menu,
.has-mega:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-item.has-mega:hover > .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-menu-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.mega-gas-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.2rem 1rem;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  color: var(--color-text);
  position: relative;
  overflow: hidden;
  border: 2px solid transparent;
}

.mega-gas-card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.3s ease;
  border-radius: inherit;
}

.mega-gas-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.mega-gas-card:hover::before {
  opacity: 0.08;
}

/* Her gaz rengi */
.mega-gas-card.gas-oksijen { --gas-color: #2196F3; }
.mega-gas-card.gas-azot    { --gas-color: #607D8B; }
.mega-gas-card.gas-argon   { --gas-color: #9C27B0; }
.mega-gas-card.gas-co2     { --gas-color: #4CAF50; }
.mega-gas-card.gas-asetilen{ --gas-color: #FF9800; }
.mega-gas-card.gas-hidrojen{ --gas-color: #00BCD4; }
.mega-gas-card.gas-helyum  { --gas-color: #E91E63; }

.mega-gas-card::before { background: var(--gas-color); }
.mega-gas-card:hover { border-color: var(--gas-color); }

/* Animasyonlu molekül ikonu */
.mega-gas-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
  position: relative;
  background: color-mix(in srgb, var(--gas-color) 12%, transparent);
  transition: var(--transition);
}

.mega-gas-card:hover .mega-gas-icon {
  background: color-mix(in srgb, var(--gas-color) 20%, transparent);
  animation: iconPulse 1s ease infinite;
}

/* Bubble animasyonu ikonun arkasında */
.mega-gas-icon::before,
.mega-gas-icon::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  background: var(--gas-color);
  opacity: 0;
  transition: var(--transition);
}

.mega-gas-card:hover .mega-gas-icon::before {
  width: 10px; height: 10px;
  top: -4px; right: -2px;
  opacity: 0.5;
  animation: bubble1 1.5s ease infinite;
}

.mega-gas-card:hover .mega-gas-icon::after {
  width: 6px; height: 6px;
  bottom: -2px; left: -4px;
  opacity: 0.4;
  animation: bubble2 1.8s ease infinite 0.3s;
}

@keyframes bubble1 {
  0%   { transform: translateY(0) scale(1); opacity: 0.5; }
  100% { transform: translateY(-18px) scale(0); opacity: 0; }
}
@keyframes bubble2 {
  0%   { transform: translateY(0) scale(1); opacity: 0.4; }
  100% { transform: translateY(-14px) scale(0); opacity: 0; }
}
@keyframes iconPulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.08); }
}

.mega-gas-icon i {
  font-size: 1.6rem;
  color: var(--gas-color);
}

.mega-gas-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 0.3rem;
}

.mega-gas-card p {
  font-size: 0.75rem;
  color: var(--color-text-light);
  line-height: 1.4;
}

/* Kimyasal sembol badge */
.gas-symbol {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 0.65rem;
  font-weight: 800;
  color: var(--gas-color);
  background: color-mix(in srgb, var(--gas-color) 10%, transparent);
  padding: 2px 6px;
  border-radius: 6px;
  letter-spacing: 0.5px;
}

/* ===================================================
   HERO — Floating Bubbles Animasyon
   =================================================== */
.hero-bubbles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.bubble {
  position: absolute;
  bottom: -60px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  animation: floatUp linear infinite;
}

.bubble:nth-child(1)  { width:20px; height:20px; left:5%;  animation-duration:8s;  animation-delay:0s;   }
.bubble:nth-child(2)  { width:35px; height:35px; left:12%; animation-duration:11s; animation-delay:1.5s; }
.bubble:nth-child(3)  { width:14px; height:14px; left:22%; animation-duration:7s;  animation-delay:3s;   }
.bubble:nth-child(4)  { width:50px; height:50px; left:35%; animation-duration:14s; animation-delay:0.5s; }
.bubble:nth-child(5)  { width:18px; height:18px; left:50%; animation-duration:9s;  animation-delay:2s;   }
.bubble:nth-child(6)  { width:28px; height:28px; left:62%; animation-duration:12s; animation-delay:4s;   }
.bubble:nth-child(7)  { width:12px; height:12px; left:72%; animation-duration:6s;  animation-delay:1s;   }
.bubble:nth-child(8)  { width:40px; height:40px; left:82%; animation-duration:13s; animation-delay:3.5s; }
.bubble:nth-child(9)  { width:22px; height:22px; left:90%; animation-duration:10s; animation-delay:0.8s; }
.bubble:nth-child(10) { width:16px; height:16px; left:96%; animation-duration:8s;  animation-delay:2.5s; }

@keyframes floatUp {
  0%   { transform: translateY(0) rotate(0deg);   opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 0.6; }
  100% { transform: translateY(-110vh) rotate(360deg); opacity: 0; }
}

/* ===================================================
   GAZ KARTLARI — Yeni Tasarım (Flip + Renkli)
   =================================================== */
.gas-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* Flip card wrapper */
.gas-flip-card {
  perspective: 1000px;
  height: 280px;
  cursor: pointer;
}

.gas-flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.65s cubic-bezier(0.4, 0.2, 0.2, 1);
  transform-style: preserve-3d;
}

.gas-flip-card:hover .gas-flip-inner,
.gas-flip-card.flipped .gas-flip-inner {
  transform: rotateY(180deg);
}

.gas-flip-front,
.gas-flip-back {
  position: absolute;
  inset: 0;
  border-radius: var(--border-radius-lg);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  text-align: center;
  overflow: hidden;
}

/* ÖN YÜZ */
.gas-flip-front {
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-gray-light);
  transition: box-shadow 0.3s;
}

.gas-flip-card:hover .gas-flip-front {
  box-shadow: var(--shadow-xl);
}

/* Her gazın rengi */
.gas-flip-card[data-gas="oksijen"]     { --gas-col: #2196F3; --gas-bg: #E3F2FD; }
.gas-flip-card[data-gas="azot"]        { --gas-col: #607D8B; --gas-bg: #ECEFF1; }
.gas-flip-card[data-gas="argon"]       { --gas-col: #9C27B0; --gas-bg: #F3E5F5; }
.gas-flip-card[data-gas="karbondioksit"] { --gas-col: #4CAF50; --gas-bg: #E8F5E9; }
.gas-flip-card[data-gas="asetilen"]    { --gas-col: #FF9800; --gas-bg: #FFF3E0; }
.gas-flip-card[data-gas="hidrojen"]    { --gas-col: #00BCD4; --gas-bg: #E0F7FA; }
.gas-flip-card[data-gas="helyum"]      { --gas-col: #E91E63; --gas-bg: #FCE4EC; }

/* Animasyonlu molekül halka */
.gas-molecule {
  position: relative;
  width: 90px;
  height: 90px;
  margin-bottom: 1rem;
}

.gas-molecule-core {
  position: absolute;
  inset: 50%;
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gas-col);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.3rem;
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--gas-col) 40%, transparent);
  animation: moleculePulse 2.5s ease-in-out infinite;
}

@keyframes moleculePulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--gas-col) 40%, transparent); }
  50%       { box-shadow: 0 0 0 12px color-mix(in srgb, var(--gas-col) 0%, transparent); }
}

.gas-molecule-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid color-mix(in srgb, var(--gas-col) 30%, transparent);
  animation: moleculeOrbit 4s linear infinite;
}

.gas-molecule-ring::after {
  content: '';
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gas-col);
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
}

.gas-molecule-ring.ring2 {
  inset: 8px;
  animation-direction: reverse;
  animation-duration: 6s;
  border-color: color-mix(in srgb, var(--gas-col) 20%, transparent);
}

@keyframes moleculeOrbit {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.gas-flip-front h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 0.4rem;
}

.gas-chem-symbol {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--gas-col);
  background: var(--gas-bg);
  padding: 2px 10px;
  border-radius: 20px;
  margin-bottom: 0.6rem;
}

.gas-flip-front p {
  font-size: 0.8rem;
  color: var(--color-text-light);
  line-height: 1.4;
}

/* Hover hint */
.flip-hint {
  position: absolute;
  bottom: 10px;
  right: 10px;
  font-size: 0.65rem;
  color: var(--color-gray);
  display: flex;
  align-items: center;
  gap: 3px;
  opacity: 0;
  transition: opacity 0.3s 0.5s;
}

.gas-flip-card:hover .flip-hint { opacity: 1; }

/* ARKA YÜZ */
.gas-flip-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--gas-col), color-mix(in srgb, var(--gas-col) 70%, black));
  color: white;
  gap: 0.6rem;
}

.gas-flip-back h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.gas-flip-back ul {
  text-align: left;
  width: 100%;
}

.gas-flip-back ul li {
  font-size: 0.8rem;
  padding: 0.25rem 0;
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0.9;
}

.gas-flip-back ul li::before {
  content: '✓';
  font-weight: 700;
  color: rgba(255,255,255,0.7);
  flex-shrink: 0;
}

.gas-flip-back .btn-back {
  margin-top: 0.5rem;
  padding: 0.4rem 1.2rem;
  border: 2px solid rgba(255,255,255,0.7);
  border-radius: 20px;
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-fast);
}

.gas-flip-back .btn-back:hover {
  background: rgba(255,255,255,0.2);
}

/* Kimyasal formül dekoratif */
.gas-formula-bg {
  position: absolute;
  bottom: -10px;
  right: -5px;
  font-size: 4rem;
  font-weight: 900;
  opacity: 0.08;
  color: white;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

/* ===================================================
   HİZMET KARTLARI — 3D Hover Lift
   =================================================== */
.service-card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-card:hover {
  transform: translateY(-8px) rotateX(2deg);
  box-shadow: 0 20px 50px rgba(0,0,0,0.12);
}

.service-icon-wrap {
  transition: transform 0.4s ease;
}

.service-card:hover .service-icon-wrap {
  transform: scale(1.15) rotate(-5deg);
}

/* ===================================================
   NEDEN BİZ — Glow Hover
   =================================================== */
.why-card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.why-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 15px 40px rgba(178,13,36,0.15);
}

.why-card-icon {
  transition: transform 0.4s ease, background 0.3s;
}

.why-card:hover .why-card-icon {
  transform: scale(1.1);
  background: var(--color-primary);
  color: white;
}

/* ===================================================
   CTA BANNER — Pulse Glow
   =================================================== */
.cta-banner {
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  top: -200px;
  right: -100px;
  animation: ctaPulse 6s ease-in-out infinite;
}

.cta-banner::after {
  content: '';
  position: absolute;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
  bottom: -100px;
  left: 5%;
  animation: ctaPulse 8s ease-in-out infinite 2s;
}

@keyframes ctaPulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.15); }
}

/* ===================================================
   MOBİL BOTTOM NAV
   =================================================== */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--color-white);
  box-shadow: 0 -4px 24px rgba(0,0,0,0.12);
  z-index: 999;
  align-items: center;
  justify-content: space-around;
  border-top: 1px solid var(--color-gray-light);
}

.mob-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 16px;
  color: var(--color-gray);
  text-decoration: none;
  font-size: 0.65rem;
  font-weight: 500;
  transition: var(--transition-fast);
  border-radius: var(--border-radius);
  flex: 1;
}

.mob-nav-item i {
  font-size: 1.3rem;
  transition: var(--transition-fast);
}

.mob-nav-item.active,
.mob-nav-item:hover {
  color: var(--color-primary);
}

.mob-nav-item.active i {
  animation: mobNavBounce 0.3s ease;
}

@keyframes mobNavBounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-4px); }
}

/* Mobilde body altına padding */
@media (max-width: 768px) {
  .mobile-bottom-nav { display: flex; }
  body { padding-bottom: 64px; }
  .footer { padding-bottom: calc(var(--spacing-xl) + 64px); }
}

/* ===================================================
   SHIMMER BUTON ANİMASYONU
   =================================================== */
.btn-primary {
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255,255,255,0.25),
    transparent
  );
  transform: skewX(-20deg);
  animation: btnShimmer 3s ease-in-out infinite 2s;
}

@keyframes btnShimmer {
  0%   { left: -100%; }
  40%, 100% { left: 150%; }
}

/* ===================================================
   SAYFA GEÇİŞ ANİMASYONU
   =================================================== */
.page-transition {
  animation: pageFadeIn 0.5s ease forwards;
}

@keyframes pageFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===================================================
   MEGA MENU — Responsive
   =================================================== */
@media (max-width: 1200px) {
  .mega-menu-inner { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 992px) {
  .mega-menu { display: none; }
  .gas-grid  { grid-template-columns: repeat(2, 1fr); }
  .gas-flip-card { height: 260px; }
}

@media (max-width: 576px) {
  .gas-grid { grid-template-columns: repeat(2, 1fr); }
  .gas-flip-card { height: 240px; }
}






/* ===================================================
   SLIDER PROGRESS BAR + ENHANCED ANIMATIONS
   =================================================== */

/* Slide geçişi sırasında içerik için blur efekti */
.slide-content h1 {
  text-shadow:
    0 2px 20px rgba(0,0,0,0.5),
    0 0 40px rgba(0,150,199,0.3);
}

/* Slider altta progress bar */
.slider-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-aegean-light), var(--color-primary));
  z-index: 15;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px rgba(72,202,228,0.8);
}

/* Slide numaratörü */
.slide-counter {
  position: absolute;
  bottom: calc(var(--spacing-md) + 10px);
  right: var(--spacing-lg);
  color: rgba(255,255,255,0.7);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 1px;
  z-index: 15;
  font-family: var(--font-primary);
}

.slide-counter .current {
  color: var(--color-aegean-light);
  font-size: 1.2rem;
  font-weight: 700;
}



/* Slide içerik - soldan giren animasyon */
@keyframes slideInFromLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInFromBottom {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

/* Slide tag'e shimmer efekti */
.slide.active .slide-tag {
  background: linear-gradient(
    90deg,
    var(--color-aegean-dark) 0%,
    var(--color-aegean) 25%,
    var(--color-aegean-light) 50%,
    var(--color-aegean) 75%,
    var(--color-aegean-dark) 100%
  );
  background-size: 200% auto;
  animation: shimmer 3s linear infinite;
  box-shadow: 0 4px 20px rgba(0,150,199,0.5);
  letter-spacing: 3px;
}

/* Slide h1 için parlama efekti */
.slide.active .slide-content h1 {
  animation: slideInFromBottom 0.7s ease 0.4s both;
}

/* Slide tag için soldan giriş */
.slide.active .slide-tag {
  animation: slideInFromLeft 0.6s ease 0.2s both, shimmer 3s linear 0.8s infinite;
}

/* Hero section bottom dekoratif çizgi */
.hero-slider::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-aegean-light), var(--color-primary), var(--color-aegean-light), transparent);
  z-index: 20;
}

/* Cinematic vignette kenarları */
.hero-slider::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 50%, rgba(3,4,94,0.6) 100%);
  z-index: 5;
  pointer-events: none;
}


/* ===================================================
   SCROLL TO TOP BUTTON
   =================================================== */
.scroll-top-btn {
  position: fixed;
  bottom: calc(var(--spacing-lg) + 70px); /* mobile nav üstünde */
  right: var(--spacing-md);
  width: 46px;
  height: 46px;
  background: linear-gradient(135deg, var(--color-aegean), var(--color-aegean-dark));
  color: white;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  cursor: pointer;
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background 0.2s ease;
  box-shadow: 0 4px 20px rgba(2,62,138,0.4);
}

.scroll-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  box-shadow: 0 6px 25px rgba(178,13,36,0.4);
  transform: translateY(-2px);
}

@media (min-width: 993px) {
  .scroll-top-btn {
    bottom: var(--spacing-lg);
  }
}

/* ===================================================
   CTA PHONE BUTTON CLASS
   =================================================== */
.btn-glass {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 2px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(4px);
  transition: var(--transition);
}

.btn-glass:hover {
  background: rgba(255,255,255,0.25);
  border-color: rgba(255,255,255,0.5);
}

/* ===================================================
   NAV ACTIVE UNDERLINE ANIMATION
   =================================================== */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--color-aegean);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s ease;
  border-radius: 2px;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

/* ===================================================
   WHY-GRID RESPONSIVE
   =================================================== */
@media (max-width: 1100px) {
  .why-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .why-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================================
   WHY CARD ENHANCED (4-col layout)
   =================================================== */
.why-card {
  text-align: center;
}

.why-card-icon {
  margin: 0 auto var(--spacing-md);
  border-radius: 50%;
  width: 64px;
  height: 64px;
}

.why-card h3 {
  font-size: var(--font-size-base);
}

.why-card p {
  font-size: 0.82rem;
}


/* ===================================================
   TOPBAR ENHANCEMENT
   =================================================== */
.topbar {
  border-bottom: 1px solid rgba(72,202,228,0.15);
}

/* ===================================================
   SECTION HEADER GRADIENT TEXT
   =================================================== */
.section-header h2 {
  background: linear-gradient(135deg, var(--color-aegean-deep), var(--color-aegean-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-dark .section-header h2 {
  background: linear-gradient(135deg, var(--color-white), var(--color-aegean-sky));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===================================================
   SMOOTH PAGE LOAD ANIMATION
   =================================================== */
body {
  animation: pageLoad 0.4s ease;
}

@keyframes pageLoad {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}


/* ===================================================
   WHATSAPP FLOATING BUTTON
   =================================================== */
.whatsapp-float {
  position: fixed;
  bottom: calc(var(--spacing-lg) + 70px);
  left: var(--spacing-md);
  width: 52px;
  height: 52px;
  background: #25D366;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  cursor: pointer;
  z-index: 998;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(37,211,102,0.45);
  transition: var(--transition);
  animation: whatsappPulse 2s ease infinite;
}

.whatsapp-float:hover {
  background: #128C7E;
  transform: scale(1.08);
  box-shadow: 0 6px 25px rgba(37,211,102,0.55);
  color: white;
}

@keyframes whatsappPulse {
  0%, 100% { box-shadow: 0 4px 20px rgba(37,211,102,0.45); }
  50% { box-shadow: 0 4px 30px rgba(37,211,102,0.65); }
}

@media (min-width: 993px) {
  .whatsapp-float {
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
  }
}


/* ===================================================
   FORM SECURITY STYLES
   =================================================== */
.btn-submit-form {
  width: 100%;
  justify-content: center;
  font-size: 1rem;
  padding: 0.9rem;
  position: relative;
  overflow: hidden;
}

.btn-submit-form:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-submit-form.sending {
  pointer-events: none;
}

.btn-submit-form.sending::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid white;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-left: 8px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Form input güvenlik - invalid state */
input:invalid:not(:placeholder-shown),
textarea:invalid:not(:placeholder-shown) {
  border-color: var(--color-primary) !important;
  box-shadow: 0 0 0 3px rgba(178,13,36,0.1);
}

input:valid:not(:placeholder-shown),
textarea:valid:not(:placeholder-shown) {
  border-color: #22c55e;
}