/* ============================================
   DÜVENCIOĞLU ÇELİK - KURUMSAL TASARIM SİSTEMİ
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
  /* Color Palette - Industrial & Premium */
  --color-primary: #1a1a1a;
  --color-secondary: #2d2d2d;
  --color-accent: #d4af37;
  --color-steel-blue: #4a90e2;
  --color-industrial-red: #c41e3a;
  --color-white: #ffffff;
  --color-light-gray: #f5f5f5;
  --color-medium-gray: #9e9e9e;
  --color-dark-gray: #424242;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Borders & Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 40px rgba(212, 175, 55, 0.3);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

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

body {
  font-family: var(--font-primary);
  color: var(--color-primary);
  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);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark-gray);
}

.lead-text {
  font-size: 1.25rem;
  line-height: 1.8;
  color: var(--color-dark-gray);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo {
  width: 50px;
  height: 50px;
  transition: transform var(--transition-normal);
}

.logo:hover {
  transform: scale(1.05) rotate(5deg);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

.nav-link {
  position: relative;
  font-weight: 500;
  color: var(--color-dark-gray);
  padding: var(--spacing-xs) var(--spacing-sm);
  transition: var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-steel-blue));
  transition: transform var(--transition-normal);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 50%, #1a1a1a 100%);
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(212, 175, 55, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(74, 144, 226, 0.1) 0%, transparent 50%);
  animation: gradientShift 10s ease infinite;
}

@keyframes gradientShift {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.7;
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: var(--spacing-md);
  animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-logo {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--spacing-md);
  filter: drop-shadow(var(--shadow-glow));
  animation: float 3s ease-in-out infinite;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.05em;
}

.hero-description {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.cta-button {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, var(--color-accent), var(--color-steel-blue));
  color: var(--color-white);
  font-weight: 600;
  font-size: 1.1rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.cta-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s;
}

.cta-button:hover::before {
  left: 100%;
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(212, 175, 55, 0.4);
}

/* ============================================
   SECTION STYLES
   ============================================ */

.section {
  padding: var(--spacing-xl) var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

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

.section-title {
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-sm);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-steel-blue));
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--color-medium-gray);
  max-width: 700px;
  margin: var(--spacing-md) auto 0;
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.about-image img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.about-content {
  padding: var(--spacing-md);
}

.feature-list {
  margin-top: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.feature-item {
  padding-left: var(--spacing-md);
  border-left: 4px solid var(--color-accent);
}

.feature-item h3 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
}

/* ============================================
   SERVICES SECTION
   ============================================ */

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

.service-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.service-row.reverse {
  direction: rtl;
}

.service-row.reverse>* {
  direction: ltr;
}

.service-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
}

.service-image img:hover {
  transform: scale(1.02);
}

.service-content {
  padding: var(--spacing-md);
}

.service-content h3 {
  font-size: 1.8rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.service-features {
  list-style: none;
  margin-top: var(--spacing-md);
}

.service-features li {
  padding: var(--spacing-xs) 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-dark-gray);
}

.service-features li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.project-item {
  padding: var(--spacing-md);
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--color-accent);
  transition: all var(--transition-normal);
}

.project-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.project-item h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   BLOG SECTION
   ============================================ */

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

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.blog-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

.blog-image {
  width: 100%;
  height: 250px;
  overflow: hidden;
}

.blog-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.blog-card:hover .blog-image img {
  transform: scale(1.1);
}

.blog-content {
  padding: var(--spacing-md);
}

.blog-date {
  display: inline-block;
  font-size: 0.9rem;
  color: var(--color-medium-gray);
  margin-bottom: var(--spacing-xs);
}

.blog-content h3 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.blog-content p {
  color: var(--color-dark-gray);
  margin-bottom: var(--spacing-sm);
}

.blog-link {
  color: var(--color-accent);
  font-weight: 600;
  transition: var(--transition-fast);
}

.blog-link:hover {
  color: var(--color-steel-blue);
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.contact-form {
  background: var(--color-white);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--color-light-gray);
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

.submit-button {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: linear-gradient(135deg, var(--color-accent), var(--color-steel-blue));
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.submit-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.info-item {
  padding: var(--spacing-md);
  background: var(--color-light-gray);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-accent);
}

.info-item h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.info-item p {
  color: var(--color-dark-gray);
  margin: 0;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  text-align: center;
}

.footer-logo {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--spacing-sm);
  filter: brightness(0) invert(1);
}

.footer p {
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--spacing-sm);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: var(--spacing-md);
    transition: left var(--transition-normal);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.active {
    left: 0;
  }

  .menu-toggle {
    display: flex;
  }

  .about-container,
  .service-row,
  .contact-container {
    grid-template-columns: 1fr;
  }

  .service-row.reverse {
    direction: ltr;
  }

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

/* ============================================
   UTILITY CLASSES
   ============================================ */

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

.hidden {
  display: none;
}

.fade-in {
  animation: fadeInUp 0.6s ease;
}