@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* --- CSS Variables & Design System --- */
:root {
  --primary-dark: #0B192C;       /* Derin Lacivert (Güven ve Kurumsallık) */
  --secondary-dark: #1E3E62;     /* Çelik Mavisi (Yapı ve Güç) */
  --accent-blue: #008DDA;        /* Parlak Elektrik Mavisi (Teknoloji ve Kimya) */
  --accent-orange: #FF8F00;      /* Canlı Turuncu (CTA & Eyleme Çağrı) */
  
  --bg-light: #F8FAFC;           /* Açık Gri Zemin */
  --bg-white: #FFFFFF;
  --text-dark: #0F172A;          /* Koyu Slate Gövde Yazısı */
  --text-light: #64748B;         /* İkincil Yazılar */
  --text-white: #FFFFFF;
  
  --border-light: #E2E8F0;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 25px -5px rgba(11, 25, 44, 0.08), 0 8px 10px -6px rgba(11, 25, 44, 0.08);
  --shadow-lg: 0 20px 40px -10px rgba(11, 25, 44, 0.15);
  
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.4);
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  color: var(--primary-dark);
  font-weight: 700;
  line-height: 1.25;
}

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

ul {
  list-style: none;
}

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

/* --- Utilities --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-padding {
  padding: 100px 0;
}

.text-center {
  text-align: center;
}

.section-title-wrapper {
  max-width: 700px;
  margin: 0 auto 50px auto;
}

.section-subtitle {
  color: var(--accent-blue);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.85rem;
  margin-bottom: 12px;
  display: inline-block;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 20px;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background-color: var(--accent-blue);
  margin: 15px auto 0 auto;
  border-radius: 2px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
  cursor: pointer;
  border: none;
  gap: 10px;
}

.btn-primary {
  background-color: var(--accent-orange);
  color: var(--text-white);
  box-shadow: 0 4px 14px rgba(255, 143, 0, 0.4);
}

.btn-primary:hover {
  background-color: #E27F00;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 143, 0, 0.5);
}

.btn-secondary {
  background-color: var(--secondary-dark);
  color: var(--text-white);
}

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

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--accent-blue);
  color: var(--accent-blue);
  padding: 10px 24px;
}

.btn-outline:hover {
  background-color: var(--accent-blue);
  color: var(--text-white);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent-blue);
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition-fast);
}

.btn-link:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* --- Header & Navigation --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: transparent;
  transition: var(--transition-smooth);
  border-bottom: 1px solid transparent;
}

.header-scrolled {
  background-color: rgba(11, 25, 44, 0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 0;
}

header:not(.header-scrolled) {
  padding: 20px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo Image Styling */
.logo {
  display: flex;
  align-items: center;
}

.logo-img {
  height: 52px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
  transition: var(--transition-smooth);
}

.header-scrolled .logo-img {
  height: 44px;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.85);
  font-weight: 600;
  font-size: 0.95rem;
  position: relative;
  padding: 8px 0;
  font-family: 'Outfit', sans-serif;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-blue);
  transition: var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text-white);
}

.nav-links a:hover::after {
  width: 100%;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 80% 20%, rgba(30, 62, 98, 0.45) 0%, rgba(11, 25, 44, 1) 100%), 
              url('../images/hero.jpg') center/cover no-repeat;
  color: var(--text-white);
  padding-top: 100px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(0deg, rgba(11,25,44,0.85) 0%, rgba(11,25,44,0.4) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 750px;
}

.hero-tag {
  background-color: rgba(0, 141, 218, 0.15);
  border: 1px solid rgba(0, 141, 218, 0.3);
  color: var(--accent-blue);
  display: inline-flex;
  padding: 6px 16px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero h1 {
  font-size: 3.8rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero h1 span {
  color: var(--accent-blue);
  display: block;
}

.hero-desc {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 40px;
  font-weight: 300;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Product Groups Section --- */
.groups-section {
  background-color: var(--bg-light);
}

.groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.group-card {
  position: relative;
  height: 250px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  border: 1px solid var(--border-light);
  transition: var(--transition-smooth);
}

.group-img-wrapper {
  width: 100%;
  height: 100%;
  background-color: var(--primary-dark);
}

.group-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.group-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(11, 25, 44, 0.95) 0%, rgba(11, 25, 44, 0.6) 50%, rgba(11, 25, 44, 0.2) 100%);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: var(--text-white);
  transition: var(--transition-smooth);
  z-index: 2;
}

.group-overlay h3 {
  color: var(--text-white);
  font-size: 1.4rem;
  margin-bottom: 6px;
  transition: var(--transition-fast);
}

.group-overlay p {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 12px;
  line-height: 1.4;
  opacity: 0.9;
}

.group-link {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  gap: 6px;
  transform: translateX(-4px);
  transition: var(--transition-smooth);
}

/* Group Card Hover State */
.group-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-blue);
}

.group-card:hover img {
  transform: scale(1.06);
}

.group-card:hover .group-overlay {
  background: linear-gradient(to top, rgba(11, 25, 44, 0.98) 0%, rgba(11, 25, 44, 0.75) 100%);
}

.group-card:hover .group-overlay h3 {
  color: var(--accent-blue);
}

.group-card:hover .group-link {
  transform: translateX(0);
  color: var(--text-white);
}

/* --- Features Section --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  background-color: var(--bg-white);
  padding: 40px 30px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: var(--transition-smooth);
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--accent-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition-smooth);
}

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

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

.feature-icon {
  width: 60px;
  height: 60px;
  background-color: rgba(0, 141, 218, 0.08);
  color: var(--accent-blue);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.95rem;
}

/* --- Zemin Sistemi Seçici (Interactive Selector) --- */
.selector-section {
  background-color: var(--primary-dark);
  color: var(--text-white);
  position: relative;
  overflow: hidden;
}

.selector-section .section-title {
  color: var(--text-white);
}

.selector-wrapper {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-top: 30px;
}

.selector-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 500px;
  margin: 0 auto 40px auto;
}

.selector-controls label {
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
  text-align: center;
}

.styled-select {
  width: 100%;
  padding: 16px 24px;
  font-family: 'Inter', sans-serif;
  font-size: 1.1rem;
  background-color: var(--secondary-dark);
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  color: var(--text-white);
  outline: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.styled-select:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 4px rgba(0, 141, 218, 0.25);
}

/* Result Box Styling */
.system-details-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 40px;
}

.system-title {
  color: var(--text-white);
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.system-desc-main {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.05rem;
  margin-bottom: 40px;
}

/* Stepper Steps */
.system-steps-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 40px;
  position: relative;
}

.system-steps-container::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background-color: rgba(255, 255, 255, 0.1);
  z-index: 1;
}

.system-step {
  display: flex;
  gap: 24px;
  position: relative;
  z-index: 2;
}

.step-num {
  width: 42px;
  height: 42px;
  background-color: var(--secondary-dark);
  border: 2px solid var(--accent-blue);
  color: var(--text-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: 0 0 15px rgba(0, 141, 218, 0.2);
}

.step-details {
  background: rgba(255, 255, 255, 0.03);
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--accent-blue);
  flex-grow: 1;
  box-shadow: var(--shadow-sm);
}

.step-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 8px;
}

.step-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-white);
}

.step-product {
  font-size: 0.95rem;
}

.step-desc {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

.system-marketing-alert {
  background: rgba(0, 141, 218, 0.1);
  border: 1px solid rgba(0, 141, 218, 0.2);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 30px;
}

.system-marketing-alert i {
  font-size: 1.4rem;
  color: var(--accent-blue);
}

.system-marketing-alert p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
}

.system-action {
  text-align: center;
}

/* --- Products Catalog --- */
.products-section {
  background-color: var(--bg-white);
}

.catalog-filters-wrapper {
  margin-bottom: 40px;
}

.search-container {
  max-width: 480px;
  margin: 0 auto 30px auto;
  position: relative;
}

.search-container input {
  width: 100%;
  padding: 16px 20px 16px 48px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border-light);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  box-shadow: var(--shadow-sm);
  outline: none;
  transition: var(--transition-fast);
}

.search-container input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 141, 218, 0.1);
}

.search-container i {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  font-size: 1.1rem;
}

.filters {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  max-width: 1000px;
  margin: 0 auto;
}

.filter-btn {
  background: var(--bg-light);
  border: 1.5px solid var(--border-light);
  padding: 8px 18px;
  border-radius: 50px;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-fast);
  color: var(--text-light);
}

.filter-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.filter-btn.active {
  background-color: var(--accent-blue);
  border-color: var(--accent-blue);
  color: var(--text-white);
  box-shadow: 0 4px 10px rgba(0, 141, 218, 0.25);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 30px;
  min-height: 200px;
}

.product-card {
  background-color: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
  transition: var(--transition-smooth);
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-blue);
}

.product-card-img-wrapper {
  width: 100%;
  height: 180px;
  background-color: var(--bg-white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-bottom: 20px;
  padding: 12px;
  border: 1px solid var(--border-light);
}

.product-card-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform var(--transition-smooth);
}

.product-card:hover .product-card-img {
  transform: scale(1.06);
}

.product-badge {
  background-color: rgba(0, 141, 218, 0.08);
  color: var(--accent-blue);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.product-code {
  font-size: 1.5rem;
  color: var(--primary-dark);
  font-weight: 800;
  margin-bottom: 4px;
}

.product-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--secondary-dark);
  margin-bottom: 16px;
  min-height: 48px; /* Alignment */
}

.product-desc {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 24px;
  flex-grow: 1;
}

.no-products {
  grid-column: 1 / -1;
  text-align: center;
  padding: 50px 0;
  color: var(--text-light);
  font-size: 1.1rem;
}

/* --- About & R&D Section --- */
.about-section {
  background-color: var(--bg-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-img-box {
  position: relative;
}

/* YENİ EKLENDİ - Video Oynatıcı Çerçevesi */
.about-video-wrapper {
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--border-light);
  background-color: var(--primary-dark);
  position: relative;
}

.about-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-badge-card {
  position: absolute;
  bottom: -24px;
  right: -24px;
  background-color: var(--accent-blue);
  color: var(--text-white);
  padding: 30px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-width: 220px;
  text-align: center;
}

.about-badge-card .num {
  font-family: 'Outfit', sans-serif;
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 6px;
}

.about-badge-card .text {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.about-content h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.about-text {
  color: var(--text-light);
  margin-bottom: 30px;
}

.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.about-feat-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary-dark);
}

.about-feat-item i {
  color: var(--accent-orange);
  font-size: 1.1rem;
  margin-top: 4px;
}

/* --- Contact & Request Section --- */
.contact-section {
  background: linear-gradient(135deg, #0B192C 0%, #1E3E62 100%);
  color: var(--text-white);
}

.contact-section .section-title {
  color: var(--text-white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: stretch;
}

.contact-info-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-intro {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.05rem;
  margin-bottom: 40px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 30px;
  margin-bottom: 40px;
}

.contact-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.contact-item-icon {
  width: 50px;
  height: 50px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--accent-blue);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item-text h4 {
  color: var(--text-white);
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.contact-item-text p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

.contact-map-placeholder {
  height: 180px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  background-color: var(--secondary-dark);
}

.contact-map-placeholder .map-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(11, 25, 44, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-white);
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  gap: 8px;
}

/* Contact Form Card */
.contact-form-card {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
}

.contact-form-card h3 {
  color: var(--text-white);
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.contact-form-card p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
  margin-bottom: 30px;
}

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group-full {
  grid-column: 1 / -1;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1.5px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  color: var(--text-white);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent-blue);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 3px rgba(0, 141, 218, 0.25);
}

.form-group select option {
  background-color: var(--primary-dark);
  color: var(--text-white);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Success Form State */
.success-box {
  text-align: center;
  padding: 30px 10px;
}

.success-icon {
  font-size: 4rem;
  color: var(--accent-orange);
  margin-bottom: 20px;
  display: block;
}

.success-box h3 {
  margin-bottom: 12px;
}

.success-box p {
  margin-bottom: 24px;
  color: rgba(255, 255, 255, 0.8);
}

/* --- YENİ EKLENDİ: ÜRÜN DETAY SAYFASI STILLERI (urun.html) --- */
.detail-page {
  background-color: var(--bg-light);
}

.detail-nav-back {
  margin-bottom: 30px;
}

.detail-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 40px;
  align-items: start;
  margin-bottom: 50px;
}

/* Sidebar Column (Resim ve Paylaşım) */
.detail-col-sidebar {
  position: sticky;
  top: 110px;
}

.detail-image-card {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 30px 24px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.detail-badge {
  background-color: rgba(0, 141, 218, 0.08);
  color: var(--accent-blue);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 24px;
  display: inline-block;
}

.detail-img-box {
  width: 100%;
  height: 250px;
  background-color: var(--bg-white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 10px;
  margin-bottom: 30px;
}

.detail-img-box img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.detail-share-box {
  width: 100%;
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
}

.detail-share-box h4 {
  font-size: 0.95rem;
  margin-bottom: 12px;
  color: var(--secondary-dark);
}

.share-actions {
  display: flex;
  gap: 12px;
  width: 100%;
}

.share-actions button,
.share-actions a {
  flex-grow: 1;
  padding: 10px 12px;
  font-size: 0.85rem;
  font-weight: 600;
}

/* Content Column (Başlık, Şartname, Hesaplayıcı, SSS) */
.detail-header {
  margin-bottom: 40px;
}

.detail-code {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1.1;
  margin-bottom: 6px;
}

.detail-title {
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--secondary-dark);
  margin-bottom: 20px;
}

.detail-desc {
  font-size: 1.05rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* Specs Table */
.detail-technical-specs {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  margin-bottom: 40px;
}

.detail-technical-specs h3,
.detail-calculator h3,
.detail-features-areas h3,
.detail-faq h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.detail-technical-specs h3 i,
.detail-calculator h3 i,
.detail-features-areas h3 i,
.detail-faq h3 i {
  color: var(--accent-blue);
}

.specs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.spec-item {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  border-bottom: 1px solid var(--bg-light);
}

.spec-item .label {
  font-size: 0.85rem;
  color: var(--text-light);
  font-weight: 500;
  margin-bottom: 4px;
}

.spec-item .value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary-dark);
}

/* Calculator Card */
.detail-calculator {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  margin-bottom: 40px;
}

.calc-intro {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.calc-row {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  align-items: center;
}

.calc-input-wrapper {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.calc-input-wrapper label {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--secondary-dark);
}

.input-with-unit {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-unit input {
  width: 100%;
  padding: 14px 44px 14px 16px;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-family: 'Inter', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  outline: none;
  transition: var(--transition-fast);
  color: var(--primary-dark);
}

.input-with-unit input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(0, 141, 218, 0.1);
}

.input-with-unit .unit {
  position: absolute;
  right: 16px;
  font-weight: 700;
  color: var(--text-light);
  font-size: 0.95rem;
}

.calc-result-container {
  min-height: 120px;
  border-left: 2px solid var(--border-light);
  padding-left: 40px;
}

.calc-placeholder {
  height: 100%;
  display: flex;
  align-items: center;
  color: var(--text-light);
  font-style: italic;
  font-size: 0.95rem;
}

/* Calculator Dynamic Results */
.calc-results {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.calc-total-box {
  background-color: rgba(0, 141, 218, 0.06);
  border: 1px solid rgba(0, 141, 218, 0.15);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.calc-total-box .title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--secondary-dark);
}

.calc-total-box .value {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.8rem;
  color: var(--accent-blue);
}

.calc-breakdown {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-comp-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-light);
}

.calc-comp-item:last-child {
  border-bottom: none;
}

.calc-comp-item.note {
  border-bottom: none;
  color: var(--text-light);
  padding-top: 12px;
}

/* Features and Areas Grid */
.detail-features-areas {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  margin-bottom: 40px;
}

.detail-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 15px;
}

.detail-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-dark);
  font-weight: 500;
}

.detail-list li i {
  margin-top: 4px;
  font-size: 1.05rem;
}

/* FAQs and Accordion */
.detail-faq {
  background-color: var(--bg-white);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  margin-bottom: 50px;
}

.faq-intro {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--bg-light);
  transition: var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--accent-blue);
}

.faq-trigger {
  width: 100%;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--primary-dark);
  text-align: left;
  cursor: pointer;
  outline: none;
}

.faq-trigger i {
  font-size: 1rem;
  color: var(--text-light);
  transition: transform var(--transition-fast);
}

.faq-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-content {
  padding: 0 24px 20px 24px;
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
  border-top: 1px solid transparent;
}

.faq-trigger[aria-expanded="true"] {
  color: var(--accent-blue);
}

/* Detail Inquiry Form Card */
.detail-inquiry-card {
  background: linear-gradient(135deg, #0B192C 0%, #1E3E62 100%);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
}

.inquiry-header {
  margin-bottom: 30px;
}

.inquiry-header h3 {
  color: var(--text-white);
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.inquiry-header p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

.inquiry-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  color: var(--text-white);
}

.inquiry-form label {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 600;
  font-size: 0.85rem;
}

.inquiry-form input,
.inquiry-form textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1.5px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  color: var(--text-white);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-fast);
}

.inquiry-form input:focus,
.inquiry-form textarea:focus {
  border-color: var(--accent-blue);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 3px rgba(0, 141, 218, 0.25);
}

/* --- Details Modal (Legacy) --- */
.modal {
  display: none;
  position: fixed;
  z-index: 1100;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(11, 25, 44, 0.6);
  backdrop-filter: blur(8px);
}

.modal-content {
  background-color: var(--bg-white);
  margin: 80px auto;
  padding: 40px;
  border-radius: var(--radius-lg);
  max-width: 900px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  position: relative;
  animation: modalOpen var(--transition-smooth);
}

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

.modal-close {
  position: absolute;
  right: 24px;
  top: 24px;
  font-size: 1.8rem;
  color: var(--text-light);
  cursor: pointer;
  transition: var(--transition-fast);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--bg-light);
}

.modal-close:hover {
  color: var(--primary-dark);
  background: var(--border-light);
}

.modal-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  margin-top: 15px;
}

.modal-badge {
  background-color: rgba(0, 141, 218, 0.08);
  color: var(--accent-blue);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 12px;
}

.modal-product-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 6px;
}

.modal-product-subtitle {
  font-size: 1.2rem;
  color: var(--secondary-dark);
  font-weight: 600;
  margin-bottom: 24px;
}

/* Modal Product Image */
.modal-product-img-container {
  width: 100%;
  max-width: 250px;
  height: 200px;
  background-color: var(--bg-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  margin-bottom: 24px;
  border: 1px solid var(--border-light);
}

.modal-product-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.modal-product-desc {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 30px;
}

.modal-features-section h4,
.modal-usage-section h4 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--bg-light);
  padding-bottom: 8px;
}

.modal-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-dark);
}

.modal-list li i {
  margin-top: 3px;
}

/* Tech Specs Card in Modal */
.tech-card {
  background-color: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 30px;
}

.tech-card h4 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tech-spec-item {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.9rem;
}

.tech-spec-item:last-child {
  border-bottom: none;
}

.tech-spec-item strong {
  color: var(--secondary-dark);
}

.tech-spec-item span {
  color: var(--text-dark);
  font-weight: 500;
  text-align: right;
  max-width: 60%;
}

/* --- Footer --- */
footer {
  background-color: var(--primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 80px 0 30px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-logo {
  color: var(--text-white);
  font-family: 'Outfit', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.footer-logo span {
  color: var(--accent-blue);
}

.footer-about p {
  font-size: 0.95rem;
  line-height: 1.6;
}

.footer-col h4 {
  color: var(--text-white);
  font-size: 1.1rem;
  margin-bottom: 24px;
  position: relative;
}

.footer-col h4::after {
  content: '';
  display: block;
  width: 30px;
  height: 2px;
  background-color: var(--accent-blue);
  margin-top: 8px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--text-white);
  transform: translateX(4px);
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-contact-list li {
  display: flex;
  gap: 12px;
  font-size: 0.95rem;
  align-items: flex-start;
}

.footer-contact-list i {
  color: var(--accent-blue);
  margin-top: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.85rem;
}

/* --- Fade In Anim --- */
.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

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

/* --- Responsive Adjustments --- */
@media (max-width: 992px) {
  h1 {
    font-size: 2.8rem !important;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .about-img-box {
    max-width: 500px;
    margin: 0 auto;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-grid {
    grid-template-columns: 1.5fr 1fr;
    gap: 30px;
  }
  
  .detail-grid {
    grid-template-columns: 1fr;
  }
  
  .detail-col-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* Can expand to mobile menu or keep simple */
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .hero {
    min-height: auto;
    padding: 150px 0 100px 0;
  }
  
  .system-step {
    flex-direction: column;
    gap: 12px;
  }
  
  .system-steps-container::before {
    display: none;
  }
  
  .step-num {
    margin: 0 auto;
  }
  
  .step-details {
    border-left: none;
    border-top: 4px solid var(--accent-blue);
  }
  
  .contact-form,
  .inquiry-form {
    grid-template-columns: 1fr;
  }
  
  .modal-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .specs-grid,
  .calc-row,
  .detail-features-areas {
    grid-template-columns: 1fr;
  }
  
  .calc-result-container {
    border-left: none;
    border-top: 2px solid var(--border-light);
    padding-left: 0;
    padding-top: 24px;
  }
}