:root {
  /* Renk paletini mavi tonlardan yeşil tonlarına değiştirdim */
  --color-background: #0a1f1a;
  --color-surface: #1a2f28;
  --color-primary: #10b981;
  --color-primary-hover: #059669;
  --color-accent: #34d399;
  --color-text: #e2f4f0;
  --color-text-secondary: #9cb3a8;
  --color-border: #2d4d42;
  --radius: 0.5rem;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
}

.hero .subtitle {
  font-size: 1.5rem;
  color: var(--color-accent);
  font-weight: 500;
}

.hero .description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.6;
}

.cta-button {
  display: inline-block;
  padding: 1rem 2rem;
  background-color: var(--color-primary);
  color: white;
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
  transition: all 0.3s ease;
  width: fit-content;
}

.cta-button:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
}

/* Section Styles */
section {
  padding: 6rem 0;
  border-bottom: 1px solid var(--color-border);
}

section h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text);
}

section .section-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 3rem;
  max-width: 700px;
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.skill-card {
  background-color: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.skill-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

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

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.skill-tag {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--color-accent);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

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

.project-card {
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.project-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.project-content {
  padding: 1.5rem;
}

.project-content h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.project-content p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.project-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

/* Contact Section */
.contact-content {
  max-width: 600px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border: 1px solid var(--color-border);
}

.contact-details h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--color-text);
}

.contact-details a {
  color: var(--color-primary);
  text-decoration: none;
}

.contact-details a:hover {
  text-decoration: underline;
}

/* Social Links */
.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.social-link {
  width: 44px;
  height: 44px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
}

.social-link:hover {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* Footer */
footer {
  padding: 3rem 0;
  text-align: center;
  color: var(--color-text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .hero .subtitle {
    font-size: 1.25rem;
  }

  .nav-links {
    gap: 1rem;
  }

  section h2 {
    font-size: 2rem;
  }

  .skills-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }
}