html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

/* ==================== DESIGN SYSTEM ==================== */
/* CSS Variables - Tutarlı renk ve boyut sistemi */
:root {
  /* Brand Colors */
  --primary-color: #5928e5;
  --primary-light: #7c4dff;
  --primary-dark: #4a21c7;
  --primary-hover: #6c37f5;
  --secondary-color: #ff644e;
  --secondary-light: #ff7a68;
  --secondary-dark: #e55740;
  
  /* Neutral Colors */
  --white: #ffffff;
  --black: #000000;
  --gray-50: #f8f9fa;
  --gray-100: #f1f3f4;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --gray-900: #212529;
  
  /* Semantic Colors */
  --success-color: #28a745;
  --success-light: #34ce57;
  --success-dark: #218838;
  --danger-color: #dc3545;
  --danger-light: #e4606d;
  --danger-dark: #c82333;
  --warning-color: #ffc107;
  --warning-light: #ffcd39;
  --warning-dark: #e0a800;
  --info-color: #17a2b8;
  --info-light: #3ac2d4;
  --info-dark: #138496;
  
  /* Background Colors */
  --bg-primary: #f5f7ff;
  --bg-secondary: #ffffff;
  --bg-light: #fafbfc;
  --bg-dark: #1a1a1a;
  --bg-gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  
  /* Text Colors */
  --text-primary: #333333;
  --text-secondary: #6c757d;
  --text-muted: #9ca3af;
  --text-light: #ffffff;
  --text-dark: #1a1a1a;
  
  /* Border */
  --border-color: #e0e6ff;
  --border-light: #f1f3f4;
  --border-dark: #dee2e6;
  
  /* Typography */
  --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --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: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --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-base: 1rem;    /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  
  /* Border Radius */
  --radius-sm: 0.375rem;   /* 6px */
  --radius-base: 0.5rem;   /* 8px */
  --radius-md: 0.75rem;    /* 12px */
  --radius-lg: 1rem;       /* 16px */
  --radius-xl: 1.5rem;     /* 24px */
  --radius-full: 9999px;   /* Full circle */
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  --shadow-primary: 0 10px 40px rgba(89, 40, 229, 0.1);
  --shadow-secondary: 0 10px 40px rgba(255, 100, 78, 0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
  --transition-all: all 0.3s ease;
  
  /* Z-Index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ==================== RESET & BASE STYLES ==================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  overflow-x: hidden;
  margin: 0;
  padding: 0;
  width: 100%;
  scroll-behavior: smooth;
}

body { 
  font-family: var(--font-family); 
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  width: 100%;
  max-width: 100%;
  position: relative;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==================== TYPOGRAPHY ==================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  margin-bottom: var(--spacing-base);
  color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-base);
  color: var(--text-secondary);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition-base);
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

small {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ==================== LAYOUT COMPONENTS ==================== */
.container-custom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-base);
}

.section-padding {
  padding: var(--spacing-3xl) 0;
}

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

/* ==================== BUTTON SYSTEM ==================== */
.btn-base {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-all);
  border: none;
  outline: none;
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: var(--bg-gradient);
  color: var(--white);
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(89, 40, 229, 0.3);
  color: var(--white);
  text-decoration: none;
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
  color: var(--white);
  box-shadow: var(--shadow-secondary);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 100, 78, 0.3);
  color: var(--white);
  text-decoration: none;
}

.btn-outline-primary {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-outline-primary:hover {
  background: var(--primary-color);
  color: var(--white);
  text-decoration: none;
}

.btn-outline-secondary {
  background: transparent;
  color: var(--secondary-color);
  border: 2px solid var(--secondary-color);
}

.btn-outline-secondary:hover {
  background: var(--secondary-color);
  color: var(--white);
  text-decoration: none;
}

.btn-success {
  background: linear-gradient(135deg, var(--success-color), var(--success-dark));
  color: var(--white);
  box-shadow: 0 4px 15px rgba(40, 167, 69, 0.2);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(40, 167, 69, 0.3);
  color: var(--white);
  text-decoration: none;
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger-color), var(--danger-dark));
  color: var(--white);
  box-shadow: 0 4px 15px rgba(220, 53, 69, 0.2);
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(220, 53, 69, 0.3);
  color: var(--white);
  text-decoration: none;
}

.btn-warning {
  background: linear-gradient(135deg, var(--warning-color), var(--warning-dark));
  color: var(--text-dark);
  box-shadow: 0 4px 15px rgba(255, 193, 7, 0.2);
}

.btn-warning:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 193, 7, 0.3);
  color: var(--text-dark);
  text-decoration: none;
}

.btn-info {
  background: linear-gradient(135deg, var(--info-color), var(--info-dark));
  color: var(--white);
  box-shadow: 0 4px 15px rgba(23, 162, 184, 0.2);
}

.btn-info:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(23, 162, 184, 0.3);
  color: var(--white);
  text-decoration: none;
}

.btn-light {
  background: var(--white);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-light:hover {
  background: var(--gray-50);
  color: var(--text-primary);
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-dark {
  background: var(--gray-800);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-dark:hover {
  background: var(--gray-900);
  color: var(--white);
  transform: translateY(-1px);
  text-decoration: none;
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-base);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-base) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ==================== FORM COMPONENTS ==================== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

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

.form-control, .form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-base);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  background-color: var(--white);
  transition: var(--transition-base);
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(89, 40, 229, 0.1);
  outline: none;
}

.form-control:disabled, .form-select:disabled {
  background-color: var(--gray-100);
  color: var(--text-muted);
  cursor: not-allowed;
}

.form-control.is-invalid, .form-select.is-invalid {
  border-color: var(--danger-color);
}

.form-control.is-valid, .form-select.is-valid {
  border-color: var(--success-color);
}

.invalid-feedback {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--danger-color);
}

.valid-feedback {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--success-color);
}

/* ==================== CARD COMPONENTS ==================== */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-base);
  border: none;
  transition: var(--transition-all);
  overflow: hidden;
}

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

.card-header {
  padding: var(--spacing-lg);
  background: var(--gray-50);
  border-bottom: 1px solid var(--border-light);
  font-weight: var(--font-weight-semibold);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-lg);
  background: var(--gray-50);
  border-top: 1px solid var(--border-light);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-base);
}

/* ==================== BADGE COMPONENTS ==================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

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

.badge-success {
  background: var(--success-color);
  color: var(--white);
}

.badge-danger {
  background: var(--danger-color);
  color: var(--white);
}

.badge-warning {
  background: var(--warning-color);
  color: var(--text-dark);
}

.badge-info {
  background: var(--info-color);
  color: var(--white);
}

.badge-light {
  background: var(--gray-200);
  color: var(--text-primary);
}

.badge-dark {
  background: var(--gray-800);
  color: var(--white);
}

/* ==================== NAVIGATION COMPONENTS ==================== */
.navbar-custom {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: var(--transition-base);
  padding: 12px 0;
}

.navbar-brand-custom {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  transition: var(--transition-base);
}

.navbar-brand-custom:hover {
  color: var(--primary-color);
  text-decoration: none;
  transform: translateY(-1px);
}

.brand-logo {
  width: 140px;
  height: 50px;
  border-radius: 10px;
  border: none;
  background: #EDF6FF;
  margin-right: 15px;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  transition: var(--transition-base);
  object-fit: contain;
}

.brand-logo:hover {
  transform: scale(1.05);
}

.brand-text {
  font-weight: 700;
  font-size: 1.4rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  padding: 8px 16px;
  border-radius: 8px;
  transition: var(--transition-base);
  display: flex;
  align-items: center;
  font-size: 0.95rem;
}

.nav-link:hover {
  color: var(--primary-color);
  background: rgba(102, 126, 234, 0.08);
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-link.active {
  color: var(--primary-color);
  background: rgba(102, 126, 234, 0.12);
  font-weight: var(--font-weight-semibold);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: var(--font-weight-medium);
  font-size: 0.9rem;
  text-decoration: none;
  transition: var(--transition-base);
  border: none;
  cursor: pointer;
  gap: 4px;
}

.nav-btn-ghost {
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
}

.nav-btn-ghost:hover {
  color: var(--primary-color);
  background: rgba(102, 126, 234, 0.08);
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.nav-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
  color: var(--white);
  text-decoration: none;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: 0.85rem;
  margin-right: 8px;
}

.modern-dropdown {
  border: none;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  padding: 8px 0;
  min-width: 200px;
  margin-top: 8px;
}

.modern-dropdown .dropdown-item {
  padding: 12px 20px;
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  transition: var(--transition-base);
  display: flex;
  align-items: center;
  font-size: 0.9rem;
}

.modern-dropdown .dropdown-item:hover {
  background: rgba(102, 126, 234, 0.08);
  color: var(--primary-color);
}

.modern-dropdown .dropdown-item.text-danger:hover {
  background: rgba(220, 53, 69, 0.08);
  color: var(--danger-color);
}

.modern-dropdown .dropdown-divider {
  margin: 8px 0;
  border-color: rgba(0, 0, 0, 0.08);
}

/* ==================== UTILITY CLASSES ==================== */
.text-gradient {
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.bg-gradient {
  background: var(--bg-gradient);
}

.shadow-custom {
  box-shadow: var(--shadow-lg);
}

.rounded-custom {
  border-radius: var(--radius-lg);
}

.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

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

.animate-fade-in-down {
  animation: fadeInDown 0.6s ease forwards;
}

.animate-slide-in-left {
  animation: slideInLeft 0.6s ease forwards;
}

.animate-slide-in-right {
  animation: slideInRight 0.6s ease forwards;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

/* ==================== RESPONSIVE DESIGN ==================== */
/* Mobile First Approach */
@media (max-width: 575.98px) {
  .container-custom {
    padding: 0 var(--spacing-base);
  }
  
  .section-padding {
    padding: var(--spacing-xl) 0;
  }
  
  .btn-base {
    padding: var(--spacing-sm) var(--spacing-base);
    font-size: var(--font-size-sm);
  }
  
  .card-body {
    padding: var(--spacing-base);
  }
  
  h1 { font-size: var(--font-size-2xl); }
  h2 { font-size: var(--font-size-xl); }
  h3 { font-size: var(--font-size-lg); }
}

@media (min-width: 576px) and (max-width: 767.98px) {
  .container-custom {
    max-width: 540px;
  }
}

@media (min-width: 768px) and (max-width: 991.98px) {
  .container-custom {
    max-width: 720px;
  }
}

@media (min-width: 992px) and (max-width: 1199.98px) {
  .container-custom {
    max-width: 960px;
  }
}

@media (min-width: 1200px) {
  .container-custom {
    max-width: 1140px;
  }
}

/* ==================== SPECIFIC COMPONENT STYLES ==================== */
/* Advertisement Cards */
.ad-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-base);
  border: none;
  transition: var(--transition-all);
  overflow: hidden;
  height: 100%;
}

.ad-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.ad-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.ad-card-body {
  padding: var(--spacing-lg);
}

.ad-card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  line-height: 1.3;
}

.ad-card-price {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.ad-card-location {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
}

.ad-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Search and Filter Components */
.search-container {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-base);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.filter-sidebar {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-base);
  padding: var(--spacing-lg);
}

.filter-group {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.filter-group:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.filter-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-base);
  color: var(--text-primary);
}

/* Price Badge */
.price-badge {
  background: var(--bg-gradient);
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-base);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  box-shadow: var(--shadow-primary);
}

/* Status Badges */
.status-published {
  background: var(--success-color);
  color: var(--white);
}

.status-draft {
  background: var(--warning-color);
  color: var(--text-dark);
}

.status-pending {
  background: var(--info-color);
  color: var(--white);
}

.status-rejected {
  background: var(--danger-color);
  color: var(--white);
}

/* Image Gallery */
.image-gallery {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-base);
}

.gallery-main-image {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.gallery-thumbnails {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-base);
  overflow-x: auto;
}

.gallery-thumbnail {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: var(--transition-base);
  border: 2px solid transparent;
}

.gallery-thumbnail:hover,
.gallery-thumbnail.active {
  border-color: var(--primary-color);
}

/* Contact Card */
.contact-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-base);
  padding: var(--spacing-lg);
  text-align: center;
}

.contact-avatar {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  object-fit: cover;
  margin: 0 auto var(--spacing-base);
  border: 3px solid var(--primary-color);
}

.contact-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.contact-joined {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-base);
}

/* Loading States */
.skeleton {
  background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

.skeleton-text {
  height: 1em;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
}

.skeleton-image {
  width: 100%;
  height: 200px;
  border-radius: var(--radius-base);
}

/* Alert Components */
.alert {
  padding: var(--spacing-base);
  border-radius: var(--radius-base);
  margin-bottom: var(--spacing-base);
  border: 1px solid transparent;
}

.alert-success {
  background: rgba(40, 167, 69, 0.1);
  color: var(--success-dark);
  border-color: var(--success-light);
}

.alert-danger {
  background: rgba(220, 53, 69, 0.1);
  color: var(--danger-dark);
  border-color: var(--danger-light);
}

.alert-warning {
  background: rgba(255, 193, 7, 0.1);
  color: var(--warning-dark);
  border-color: var(--warning-light);
}

.alert-info {
  background: rgba(23, 162, 184, 0.1);
  color: var(--info-dark);
  border-color: var(--info-light);
}

/* Modal Overrides */
.modal-content {
  border-radius: var(--radius-lg);
  border: none;
  box-shadow: var(--shadow-xl);
}

.modal-header {
  border-bottom: 1px solid var(--border-light);
  padding: var(--spacing-lg);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  border-top: 1px solid var(--border-light);
  padding: var(--spacing-lg);
}

/* Pagination */
.pagination .page-link {
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: var(--spacing-sm) var(--spacing-base);
  margin: 0 var(--spacing-xs);
  border-radius: var(--radius-base);
  transition: var(--transition-base);
}

.pagination .page-link:hover {
  color: var(--primary-color);
  background: rgba(89, 40, 229, 0.05);
  border-color: var(--primary-color);
}

.pagination .page-item.active .page-link {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--white);
}

/* ==================== LEGACY BOOTSTRAP OVERRIDES ==================== */
.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem var(--primary-color);
}

/* ==================== PRINT STYLES ==================== */
@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  .no-print {
    display: none !important;
  }
}

/* ==================== MOBILE RESPONSIVE ENHANCEMENTS ==================== */
/* Mobile Navigation */
@media (max-width: 991.98px) {
  .navbar-custom .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
  }
  
  .navbar-custom {
    padding: 0.5rem 0;
  }
  
  .navbar-brand-custom {
    font-size: var(--font-size-base);
  }
  
  .brand-logo {
    width: 110px;
    height: 40px;
    border-radius: 8px;
    border: none;
    background: #EDF6FF;
    margin-right: 12px;
    box-shadow: 0 3px 12px rgba(102, 126, 234, 0.25);
    transition: var(--transition-base);
    object-fit: contain;
  }
  
  .navbar-toggler {
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    padding: 8px 12px;
    background: var(--white);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
  }
  
  .navbar-toggler:focus {
    box-shadow: 0 0 0 0.25rem rgba(102, 126, 234, 0.25);
    outline: none;
  }
  
  .navbar-toggler:hover {
    background: rgba(102, 126, 234, 0.08);
    transform: scale(1.05);
  }
  
  .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28102, 126, 234, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    width: 24px;
    height: 24px;
  }
  
  .navbar-collapse {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin-top: var(--spacing-base);
    padding: var(--spacing-lg);
  }
  
  .navbar-nav {
    margin-bottom: var(--spacing-lg);
  }
  
  .nav-link {
    padding: var(--spacing-base) 0;
    border-bottom: 1px solid var(--border-light);
  }
  
  .nav-link:last-child {
    border-bottom: none;
  }
  
  .navbar-custom .d-flex {
    flex-direction: column;
    width: 100%;
    gap: var(--spacing-sm);
  }
  
  .navbar-custom .nav-btn {
    width: 100%;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
  }
  
  .navbar-custom .dropdown {
    width: 100%;
  }
  
  .navbar-custom .dropdown-toggle {
    width: 100%;
    justify-content: center;
  }
  
  .btn-post-ad {
    width: 100%;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
  }
  
  .user-nav-item {
    width: 100%;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
  }
}

/* Mobile Forms */
@media (max-width: 767.98px) {
  .form-step {
    padding: var(--spacing-base);
    margin-bottom: var(--spacing-lg);
  }
  
  .form-step-header {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }
  
  .step-number {
    margin-right: 0;
    margin-bottom: var(--spacing-sm);
  }
  
  .form-control,
  .form-select {
    font-size: 16px; /* Prevents zoom on iOS */
  }
  
  .btn-base {
    width: 100%;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
  }
  
  .btn-lg {
    padding: var(--spacing-lg) var(--spacing-base);
    font-size: var(--font-size-base);
  }
  
  .ad-actions {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .ad-actions .btn {
    width: 100%;
  }
}

/* Mobile Cards */
@media (max-width: 767.98px) {
  .ad-card {
    margin-bottom: var(--spacing-lg);
  }
  
  .ad-card-body {
    padding: var(--spacing-base);
  }
  
  .ad-card-title {
    font-size: var(--font-size-base);
    line-height: 1.4;
  }
  
  .ad-card-description {
    font-size: var(--font-size-sm);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  
  .ad-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
  }
  
  .stats-cards {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-base);
  }
  
  .stat-card {
    padding: var(--spacing-base);
  }
  
  .stat-number {
    font-size: var(--font-size-xl);
  }
  
  .stat-label {
    font-size: var(--font-size-xs);
  }
}

/* Mobile Filters */
@media (max-width: 767.98px) {
  .filter-sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%;
    height: 100vh;
    z-index: var(--z-modal);
    transition: var(--transition-base);
    overflow-y: auto;
    border-radius: 0;
  }
  
  .filter-sidebar.show {
    left: 0;
  }
  
  .filter-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
  }
  
  .filter-backdrop.show {
    opacity: 1;
    visibility: visible;
  }
  
  .filter-tabs {
    flex-wrap: wrap;
    gap: var(--spacing-xs);
  }
  
  .filter-tab {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
  }
  
  .search-container {
    padding: var(--spacing-base);
  }
  
  .search-input {
    font-size: 16px; /* Prevents zoom on iOS */
  }
}

/* Mobile Gallery */
@media (max-width: 767.98px) {
  .gallery-main-image {
    height: 250px;
  }
  
  .gallery-thumbnails {
    padding: var(--spacing-sm);
    gap: var(--spacing-xs);
  }
  
  .gallery-thumbnail {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
  }
  
  .image-gallery {
    margin-bottom: var(--spacing-lg);
  }
}

/* Mobile Contact Card */
@media (max-width: 767.98px) {
  .contact-card {
    padding: var(--spacing-base);
    margin-bottom: var(--spacing-lg);
  }
  
  .contact-avatar {
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-sm);
  }
  
  .contact-name {
    font-size: var(--font-size-base);
  }
  
  .contact-joined {
    font-size: var(--font-size-xs);
  }
}

/* Mobile Modal */
@media (max-width: 767.98px) {
  .modal-dialog {
    margin: var(--spacing-base);
    max-width: calc(100vw - 2rem);
  }
  
  .modal-content {
    border-radius: var(--radius-base);
  }
  
  .modal-header,
  .modal-body,
  .modal-footer {
    padding: var(--spacing-base);
  }
  
  .modal-title {
    font-size: var(--font-size-lg);
  }
  
  .warning-icon {
    font-size: 2rem;
  }
}

/* Mobile Toast */
@media (max-width: 767.98px) {
  .toast-container {
    position: fixed !important;
    top: var(--spacing-base) !important;
    right: var(--spacing-base) !important;
    left: var(--spacing-base) !important;
    max-width: none;
  }
  
  .toast {
    width: 100%;
    margin-bottom: var(--spacing-sm);
  }
  
  .toast-header {
    padding: var(--spacing-sm) var(--spacing-base);
  }
  
  .toast-body {
    padding: var(--spacing-base);
    font-size: var(--font-size-sm);
  }
}

/* Mobile Loading */
@media (max-width: 767.98px) {
  .loading-spinner {
    padding: var(--spacing-base);
  }
  
  .loading-text {
    font-size: var(--font-size-sm);
  }
}

/* Mobile Typography */
@media (max-width: 767.98px) {
  h1 { font-size: var(--font-size-2xl); }
  h2 { font-size: var(--font-size-xl); }
  h3 { font-size: var(--font-size-lg); }
  h4 { font-size: var(--font-size-base); }
  h5 { font-size: var(--font-size-sm); }
  h6 { font-size: var(--font-size-xs); }
  
  .text-gradient {
    font-size: var(--font-size-xl) !important;
  }
}

/* Mobile Pagination */
@media (max-width: 767.98px) {
  .pagination {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .pagination .page-link {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    margin: var(--spacing-xs);
  }
}

/* Touch Improvements */
@media (max-width: 767.98px) {
  .btn,
  .nav-link,
  .filter-tab,
  .badge {
    min-height: 44px; /* Apple's recommended touch target size */
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .btn-sm {
    min-height: 36px;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .btn-lg {
    min-height: 56px;
    padding: var(--spacing-base) var(--spacing-lg);
  }
  
  /* Improve clickable areas */
  .ad-card {
    padding: var(--spacing-base);
  }
  
  .ad-card-body {
    padding: var(--spacing-sm);
  }
}

/* Landscape Mobile */
@media (max-width: 767.98px) and (orientation: landscape) {
  .navbar-custom {
    padding: 0.25rem 0;
  }
  
  .page-header {
    margin-bottom: var(--spacing-base);
  }
  
  .stats-cards {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .stat-card {
    padding: var(--spacing-sm);
  }
  
  .form-step {
    padding: var(--spacing-sm);
  }
}

/* Large Mobile Screens */
@media (min-width: 576px) and (max-width: 767.98px) {
  .stats-cards {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .ad-actions {
    flex-direction: row;
    justify-content: space-between;
}

  .ad-actions .btn {
    width: auto;
    flex: 1;
    margin: 0 var(--spacing-xs);
  }
}

/* Tablet Specific */
@media (min-width: 768px) and (max-width: 991.98px) {
  .container-custom {
    max-width: 720px;
  }
  
  .stats-cards {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .ad-card-body {
    padding: var(--spacing-lg);
  }
  
  .form-step {
    padding: var(--spacing-xl);
  }
  
  .filter-sidebar {
    width: 300px;
  }
  
  .gallery-main-image {
    height: 350px;
  }
}

/* Desktop Specific */
@media (min-width: 992px) {
  .container-custom {
    max-width: 960px;
  }
  
  .stats-cards {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .ad-actions {
    justify-content: flex-end;
  }
  
  .filter-sidebar {
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }
}

/* Large Desktop */
@media (min-width: 1200px) {
  .container-custom {
    max-width: 1140px;
  }
  
  .stats-cards {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
  }
  
  .ad-card-body {
    padding: var(--spacing-xl);
  }
  
  .form-step {
    padding: var(--spacing-2xl);
  }
}

/* High DPI Screens */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .brand-logo,
  .icon-primary,
  .contact-avatar {
    transform: translateZ(0); /* Hardware acceleration */
  }
  
  .ad-card:hover {
    transform: translateY(-2px) translateZ(0);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  } 
  
  .animate-fade-in,
  .animate-fade-in-up,
  .animate-fade-in-down,
  .animate-slide-in-left,
  .animate-slide-in-right,
  .animate-pulse {
    animation: none !important;
  }
  
  .loading::after {
    animation: none !important;
  }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-light: #3d3d3d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #888888;
    --border-color: #444444;
    --border-light: #555555;
    --gray-50: #2d2d2d;
    --gray-100: #3d3d3d;
    --gray-200: #4d4d4d;
    --white: #2d2d2d;
  }
  
  .card,
  .ad-card,
  .filter-sidebar,
  .search-container,
  .modal-content {
    background: var(--bg-secondary);
    border-color: var(--border-color);
  }
  
  .navbar-custom {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
  }
  
  .toast {
    background: var(--bg-secondary);
    border-color: var(--border-color);
  }
  
  .loading-overlay {
    background: rgba(26, 26, 26, 0.95);
  }
}

/* Print Styles */
@media print {
  .navbar-custom,
  .filter-sidebar,
  .btn-post-ad,
  .ad-actions,
  .toast-container,
  .loading-overlay {
    display: none !important;
  }
  
  .ad-card,
  .contact-card {
    border: 1px solid #000;
    break-inside: avoid;
    margin-bottom: 20px;
  }
  
  .ad-card-title {
    font-size: 18px;
    font-weight: bold;
  }
  
  .ad-price {
    font-size: 16px;
    font-weight: bold;
  }
  
  .container-custom {
    max-width: none;
    padding: 0;
  }
}

/* Accessibility Improvements */
@media (prefers-contrast: high) {
  .btn-primary {
    background: #000;
    color: #fff;
    border: 2px solid #000;
  }
  
  .btn-outline-primary {
    border-width: 2px;
  }
  
  .form-control:focus,
  .form-select:focus {
    border-width: 2px;
    box-shadow: 0 0 0 2px rgba(89, 40, 229, 0.5);
  }
  
  .nav-link:focus,
  .btn:focus {
    outline: 2px solid #000;
    outline-offset: 2px;
  }
}

/* Focus Styles for Keyboard Navigation */
.btn:focus,
.nav-link:focus,
.form-control:focus,
.form-select:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.btn:focus:not(:focus-visible) {
  outline: none;
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: var(--white);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-base);
  z-index: var(--z-tooltip);
}

.skip-link:focus {
  top: 6px;
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==================== MODERN SHARED COMPONENTS ==================== */
/* Ortak Modern Stil Bileşenleri - Tüm sayfalar için tutarlılık */

.modern-page-container {
    background: linear-gradient(135deg, #f8faff 0%, #e6f3ff 100%);
    min-height: 100vh;
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: #2d3748;
    -webkit-font-smoothing: antialiased;
}

.modern-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(224, 230, 255, 0.6);
    transition: all 0.3s ease;
    padding: 2rem;
}

.modern-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1);
}

.modern-card-header {
    background: rgba(89, 40, 229, 0.02);
    border-bottom: 1px solid rgba(224, 230, 255, 0.6);
    border-radius: 24px 24px 0 0;
    padding: 1.5rem 2rem;
    margin: -2rem -2rem 2rem -2rem;
}

.modern-button {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border: none;
    border-radius: 12px;
    color: white;
    font-weight: 500;
    padding: 0.75rem 2rem;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.modern-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(89, 40, 229, 0.3);
    color: white;
}

.modern-input {
    background: rgba(248, 250, 255, 0.8);
    border: 2px solid rgba(224, 230, 255, 0.6);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    font-size: 1rem;
    width: 100%;
}

.modern-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(89, 40, 229, 0.1);
    background: white;
    outline: none;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

/* Global Modern Form Styling */
.modern-form .form-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.modern-form .form-control {
    background: rgba(248, 250, 255, 0.8);
    border: 2px solid rgba(224, 230, 255, 0.6);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.modern-form .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(89, 40, 229, 0.1);
    background: white;
}

/* Modern Table Styling */
.modern-table {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(224, 230, 255, 0.6);
}

.modern-table thead {
    background: rgba(89, 40, 229, 0.03);
}

/* Modern Alert Styling */
.modern-alert {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    border: 1px solid rgba(224, 230, 255, 0.6);
    padding: 1rem 1.5rem;
}

/* Responsive Modern Grid */
.modern-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}