:root {
  --primary: #ffffff;
  --secondary: #f8f9fa;
  --accent: #007bff;
  --text: #000000;
  --text-light: #6c757d;
  --bg: #ffffff;
  --bg-light: #f8f9fa;
  --bg-card: #ffffff;
  --border: #dee2e6;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
  --radius: 8px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition: all 0.3s ease;
}

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

[data-theme="dark"] {
  --primary: #000000;
  --secondary: #1a1a1a;
  --accent: #007bff;
  --text: #ffffff;
  --text-light: #6c757d;
  --bg: #000000;
  --bg-light: #1a1a1a;
  --bg-card: #1a1a1a;
  --border: #333333;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  transition: var(--transition);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: white;
  cursor: pointer;
  transition: none !important;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn:hover {
  background: #0056b3;
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

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

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: none !important;
  height: 100%;
}

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

.input {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text);
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: none !important;
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

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

.badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  background: var(--accent);
  color: white;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.grid {
  display: grid;
  gap: 24px;
}

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

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

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

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

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

.justify-between {
  justify-content: space-between;
}

.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.gap-8 { gap: 32px; }

.text-center { text-align: center; }
.text-sm { font-size: 14px; }
.text-lg { font-size: 18px; }
.text-xl { font-size: 20px; }
.text-2xl { font-size: 24px; }
.text-3xl { font-size: 30px; }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-primary { color: var(--text); }
.text-secondary { color: var(--text-light); }

.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mb-8 { margin-bottom: 32px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }

.hidden { display: none; }

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: #000000;
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 999;
}

[data-theme="light"] .header {
  background: #000000;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  text-decoration: none;
  transition: none !important;
}

.brand:hover {
  color: #ffffff;
}

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

.nav-link {
  color: #6c757d;
  text-decoration: none;
  font-weight: 500;
  transition: none !important;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-link:hover {
  color: #ffffff;
}

.nav-link:focus {
  color: #ffffff;
  outline: none;
}

.nav-link.active {
  color: #ffffff;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle-btn {
  width: 44px;
  height: 32px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 2px solid var(--border);
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  z-index: 1000;
}

.theme-toggle-btn::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  background: var(--accent);
  border-radius: 50%;
  transition: transform 0.3s ease;
  z-index: 1;
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  transform: scale(1.05);
}

[data-theme="light"] .theme-toggle-btn::before {
  transform: translateX(12px);
}

[data-theme="dark"] .theme-toggle-btn::before {
  transform: translateX(0);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
  position: relative;
  width: 40px;
  height: 40px;
  justify-content: center;
  align-items: center;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: #ffffff;
  transition: all 0.3s ease;
  border-radius: 2px;
  display: block;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(-20px);
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

@media (max-width: 768px) {
  /* MOBİL HEADER - SIFIRDAN YAZILDI */
  .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 60px;
    background: #000000;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.3);
  }
  
  .container {
    max-width: 100%;
    padding: 0 15px;
    margin: 0;
  }
  
  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    width: 100%;
  }
  
  .brand {
    font-size: 1.3rem;
    font-weight: 700;
    color: #ffffff;
    text-decoration: none;
    z-index: 1001;
    flex-shrink: 0;
  }
  
  .nav-controls {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
    align-items: center;
    gap: 12px;
    z-index: 1001;
  }
  
  .nav-toggle {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1002;
  }
  
  .nav-toggle span {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    width: 24px;
    height: 3px;
    background: #ffffff !important;
    border-radius: 2px;
    transition: all 0.3s ease;
    margin: 2px 0;
  }
  
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
  
  .theme-toggle-btn {
    width: 36px;
    height: 22px;
    border-radius: 11px;
    background: #333333;
    border: 2px solid #555555;
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
  }
  
  .theme-toggle-btn::before {
    content: '';
    position: absolute;
    top: 1px;
    left: 1px;
    width: 16px;
    height: 16px;
    background: #ffffff;
    border-radius: 50%;
    transition: transform 0.3s ease;
  }
  
  [data-theme="light"] .theme-toggle-btn::before {
    transform: translateX(14px);
  }
  
  .nav-menu {
    display: none !important;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.98);
    backdrop-filter: blur(15px);
    z-index: 999;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0;
  }
  
  .nav-menu.active {
    display: flex !important;
  }
  
  .nav-link {
    display: block;
    padding: 18px 35px;
    margin: 8px 0;
    color: #ffffff;
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    text-align: center;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: all 0.3s ease;
    min-width: 180px;
  }
  
  .nav-link:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(255, 255, 255, 0.1);
  }
  
  /* GENEL MOBİL STİLLER */
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 40px 0;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 12px;
  }
  
  .card {
    padding: 20px;
  }
}