:root {
  /* Renkler */
  --color-primary: #000;
  --color-primary-light: #1a1a1a;
  --color-white: #fff;
  --color-white-hover: #e9ecef;
  --color-bg-primary: #f8f9fa;
  --color-bg-secondary: #f1f3f4;
  --color-text-primary: #333;
  --color-text-secondary: #6c757d;
  --color-text-light: #f1f3f4;
  --color-border: #e9ecef;
  --color-border-secondary: rgba(108, 117, 125, 0.3);
  --color-border-hover: rgba(108, 117, 125, 0.5);
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-shadow-heavy: rgba(0, 0, 0, 0.25);

  /* Font Boyutları */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 2rem;        /* 32px */
  --font-size-4xl: 2.5rem;      /* 40px */
  --font-size-5xl: 3rem;        /* 48px */

  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-xs: 0.25rem;         /* 4px */
  --spacing-sm: 0.5rem;          /* 8px */
  --spacing-md: 0.75rem;         /* 12px */
  --spacing-lg: 1rem;            /* 16px */
  --spacing-xl: 1.5rem;          /* 24px */
  --spacing-2xl: 2rem;           /* 32px */
  --spacing-3xl: 3rem;           /* 48px */
  --spacing-4xl: 4rem;           /* 64px */
  --spacing-5xl: 5rem;           /* 80px */

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 2rem;

  /* Button Heights */
  --btn-height-sm: 2.5rem;
  --btn-height-md: 3rem;
  --btn-height-lg: 3.5rem;

  /* Container */
  --container-max-width: 1200px;
  --container-padding-mobile: 1rem;
  --container-padding-tablet: 1.5rem;
  --container-padding-desktop: 2rem;

  /* Header */
  --header-height: 5rem;

  /* Z-index */
  --z-header: 1000;
  --z-overlay: 1;

  /* Font Family */
  --font-family: "Inter", sans-serif;

  /* Line Heights */
  --line-height-tight: 1.1;
  --line-height-normal: 1.6;

  /* Shadows */
  --shadow-sm: 0 4px 6px -1px var(--color-shadow);
  --shadow-lg: 0 25px 50px -12px var(--color-shadow-heavy);

  /* Transitions */
  --transition-hover: 0.15s ease;
}

/* Text Selection */
::selection {
  background: var(--color-primary);
  color: var(--color-white);
}

::-moz-selection {
  background: var(--color-primary);
  color: var(--color-white);
}

/* Smooth scroll */
html {
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-family);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding-mobile);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--container-padding-tablet);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--container-padding-desktop);
  }
}

/* Header */
.header {
  background: var(--color-bg-primary);
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  border-bottom: 1px solid var(--color-border);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-icon {
  background: var(--color-primary);
  color: var(--color-white);
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
}

.logo-text {
  margin-left: var(--spacing-md);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
}

.nav-desktop {
  display: none;
  gap: var(--spacing-2xl);
}

.nav-desktop a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  transition: color var(--transition-hover);
}

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

/* Desktop Dropdown */
.nav-dropdown {
  position: relative;
}

.dropdown-content {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-white);
  min-width: 200px;
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-hover);
  z-index: 1000;
  margin-top: var(--spacing-sm);
}

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

.dropdown-content a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-lg);
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-hover);
}

.dropdown-content a:first-child {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.dropdown-content a:last-child {
  border-bottom: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.dropdown-content a:hover {
  background: var(--color-bg-secondary);
  color: var(--color-primary);
}

.dropdown-content a:first-child:hover {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.dropdown-content a:last-child:hover {
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.desktop-only {
  display: none;
}

.mobile-menu-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hamburger-icon,
.close-icon {
  position: absolute;
  color: var(--color-primary);
  transition: all var(--transition-hover);
}

.hamburger-icon {
  opacity: 1;
  transform: scale(1);
}

.close-icon {
  opacity: 0;
  transform: scale(0.8);
}

/* Active state - show X, hide hamburger */
.mobile-menu-btn.active .hamburger-icon {
  opacity: 0;
  transform: scale(0.8);
}

.mobile-menu-btn.active .close-icon {
  opacity: 1;
  transform: scale(1);
}

/* Hamburger lines animation (optional enhanced version) */
.hamburger-line {
  transition: all var(--transition-hover);
  transform-origin: center;
}

.mobile-menu-btn.active .hamburger-line.top {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .hamburger-line.middle {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-menu-btn.active .hamburger-line.bottom {
  transform: rotate(-45deg) translate(5px, -5px);
}

.nav-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  z-index: 999;
  box-shadow: var(--shadow-lg);
}

.nav-mobile.active {
  display: block;
}

.nav-mobile nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.nav-mobile a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  padding: var(--spacing-sm) 0;
  transition: color var(--transition-hover);
}

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

.mobile-contact-btn {
  margin-top: var(--spacing-sm);
}

/* Mobile Dropdown */
.mobile-dropdown {
  position: relative;
}

.mobile-dropdown-toggle {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-dropdown-toggle::after {
  content: "▼";
  font-size: var(--font-size-xs);
  margin-left: var(--spacing-sm);
  transition: transform var(--transition-hover);
}

.mobile-dropdown.active .mobile-dropdown-toggle::after {
  transform: rotate(180deg);
}

.mobile-dropdown-content {
  display: none;
  padding-left: var(--spacing-lg);
  margin-top: var(--spacing-sm);
}

.mobile-dropdown.active .mobile-dropdown-content {
  display: block;
}

.mobile-dropdown-content a {
  display: block;
  padding: var(--spacing-xs) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  opacity: 0.8;
}

/* Buttons */
.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-family: inherit;
  white-space: nowrap;
  height: var(--btn-height-md);
  transition: all var(--transition-hover);
}

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

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

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-light);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-primary);
  border: 1px solid var(--color-white);
}

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

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 1px solid var(--color-white);
}

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

.btn-service {
  background: var(--color-white);
  color: var(--color-primary);
  width: 100%;
  margin-top: var(--spacing-xl);
  font-weight: var(--font-weight-semibold);
}

.btn-service:hover {
  background: var(--color-white-hover);
}



.btn-full {
  width: 100%;
}

/* Form Elementleri */
.form-row {
  display: grid;
  gap: var(--spacing-md);
  grid-template-columns: 1fr;
  margin-bottom: calc(var(--spacing-md) *2 );
}

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

.form-group:last-child {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-xl);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  color: var(--color-primary);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: all var(--transition-hover);
}

.form-group select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23000000' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right var(--spacing-lg) center;
  background-repeat: no-repeat;
  background-size: 1rem;
  padding-right: var(--spacing-3xl);
  appearance: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-secondary);
}

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

/* Footer */
.footer {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
  padding: var(--spacing-4xl) 0;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-3xl);
  position: relative;
  z-index: var(--z-overlay);
  
  /* Mobile: Stacked layout */
  grid-template-areas:
    "brand"
    "pages"
    "services";
}

.footer-section ul li a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-hover);
}

.footer-section ul li a:hover {
  color: var(--color-white-hover);
}

.footer-logo {
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: center;
}

.footer-section:nth-child(1) { /* Sayfalar */
  grid-area: pages;
}

.footer-section:nth-child(2) { /* Hizmetler */
  grid-area: services;
}

.footer-brand {
  grid-area: brand;
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.footer-brand .logo-icon {
  background: var(--color-white);
  color: var(--color-primary);
}

.footer-brand .logo-text {
  color: var(--color-white);
}

.footer-brand p {
  color: var(--color-text-light);
  line-height: var(--line-height-normal);
  margin-bottom: var(--spacing-lg);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-social-link {
  color: var(--color-text-light);
  transition: color var(--transition-hover);
  text-decoration: none;
}

.footer-social-link:hover {
  color: var(--color-white);
}

.footer-section h4 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: color var(--transition-hover);
}

.footer-section li:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid var(--color-text-secondary);
  padding-top: var(--spacing-xl);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  z-index: var(--z-overlay);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  background: var(--color-white);
  color: var(--color-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition-hover);
}

.social-link:hover {
  background: var(--color-white-hover);
}

.copyright {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--color-text-light);
  font-size: var(--font-size-base);
}

.copyright svg {
  color: var(--color-primary);
}

/* Loading states */
.btn.loading {
  position: relative;
  color: transparent;
}

.btn.loading::after {
  content: "";
  position: absolute;
  width: var(--spacing-2xl);
  height: var(--spacing-2xl);
  top: 50%;
  left: 50%;
  margin-left: -var(--spacing-xl);
  margin-top: -var(--spacing-xl);
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .service-card,
  .blog-card,
  .contact-card {
    border-width: var(--spacing-sm);
  }
}

/* Custom Scrollbar Design */
::-webkit-scrollbar {
  width: 14px;
  height: 14px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-bg-secondary);
  transition: all var(--transition-hover);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
  border-color: var(--color-border);
  transform: scale(1.05);
}

::-webkit-scrollbar-thumb:active {
  background: var(--color-primary);
  transform: scale(0.95);
}

::-webkit-scrollbar-corner {
  background: var(--color-bg-secondary);
}

/* Firefox Scrollbar */
html {
  scrollbar-width: auto;
  scrollbar-color: var(--color-primary) var(--color-bg-secondary);
}

/* Responsive Header ve Footer */
@media (min-width: 640px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
  }
  
  .form-group {
    margin-bottom: var(--spacing-lg);
  }

  .footer-bottom {
    justify-content: center;
  }
}

@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }

  .desktop-only {
    display: inline-flex;
  }

  .mobile-menu-btn {
    display: none;
  }

  .footer-content {
    grid-template-columns: repeat(6, 1fr);
    grid-template-areas: "pages services . . brand brand";
    gap: var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .footer-content {
    grid-template-columns: repeat(6, 1fr);
    grid-template-areas: "pages services . . brand brand";
    gap: var(--spacing-xl);
  }
}