/* ================================================
   BERKAN TÜREL - CYBER SECURITY ANALYST
   Portfolio Website Stylesheet
   ================================================ */

/* ------------------------------------------------
   CSS Custom Properties (Design Tokens)
   ------------------------------------------------ */
:root {
  /* Colors - Dark Theme */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a25;
  --bg-card: #14141e;

  --accent-primary: #00d4aa;
  --accent-primary-dim: rgba(0, 212, 170, 0.1);
  --accent-primary-glow: rgba(0, 212, 170, 0.3);
  --accent-secondary: #0ea5e9;
  --accent-secondary-dim: rgba(14, 165, 233, 0.1);

  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b0;
  --text-muted: #6a6a7a;

  --border-color: #2a2a35;
  --border-subtle: #1f1f2a;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;
}

/* ------------------------------------------------
   CSS Reset & Base Styles
   ------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  cursor: none;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  cursor: none;
}

/* Custom Cursor */
.cursor {
  pointer-events: none;
  position: fixed;
  width: 20px;
  height: 20px;
  border: 2px solid var(--accent-primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.15s, height 0.15s, border-color 0.15s;
  z-index: 9999;
  mix-blend-mode: difference;
}

.cursor-dot {
  pointer-events: none;
  position: fixed;
  width: 6px;
  height: 6px;
  background: var(--accent-primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  z-index: 9999;
  box-shadow:
    0 0 10px var(--accent-primary),
    0 0 20px var(--accent-primary),
    0 0 30px var(--accent-primary-glow);
}

.cursor.hover {
  width: 40px;
  height: 40px;
  border-color: var(--accent-secondary);
}

.cursor-trail {
  pointer-events: none;
  position: fixed;
  width: 8px;
  height: 8px;
  background: var(--accent-primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  z-index: 9998;
  opacity: 0.5;
  filter: blur(2px);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ------------------------------------------------
   Typography
   ------------------------------------------------ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

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

.text-mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* ------------------------------------------------
   Layout
   ------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

section {
  padding: var(--space-2xl) 0;
}

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

.section-header h2 {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-header h2::before {
  content: '';
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-primary));
}

.section-header h2::after {
  content: '';
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), transparent);
}

.section-subtitle {
  color: var(--text-muted);
  margin-top: var(--space-sm);
  font-size: 1rem;
}

/* ------------------------------------------------
   Navigation
   ------------------------------------------------ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-md) 0;
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  transition: var(--transition-base);
}

.nav-logo:hover {
  filter: drop-shadow(0 0 8px var(--accent-primary));
}

.nav-logo .logo-shield {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.nav-logo .logo-shield svg {
  width: 28px;
  height: 28px;
  color: var(--accent-primary);
  filter: drop-shadow(0 0 6px var(--accent-primary-glow));
}

.nav-logo .logo-text {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-primary);
  text-shadow: 0 0 10px var(--accent-primary-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: width var(--transition-base);
}

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

.nav-links a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-base);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
}

/* ------------------------------------------------
   Hero Section
   ------------------------------------------------ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 20%, var(--accent-primary-dim) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, var(--accent-secondary-dim) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-intro {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 1rem;
  margin-bottom: var(--space-sm);
}

.hero-name {
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--space-lg);
}

.hero-tagline {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

.hero-tagline strong {
  color: var(--accent-primary);
  font-weight: 500;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.badge:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.badge svg {
  width: 16px;
  height: 16px;
  color: var(--accent-primary);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* ------------------------------------------------
   Buttons
   ------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.875rem 1.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition-base);
  cursor: pointer;
}

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

.btn-primary:hover {
  background: #00e6b8;
  box-shadow: 0 0 30px var(--accent-primary-glow);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.btn svg {
  width: 18px;
  height: 18px;
}

/* ------------------------------------------------
   About Section
   ------------------------------------------------ */
.about {
  background: var(--bg-secondary);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-text {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.about-text+.about-text {
  margin-top: var(--space-lg);
}

.about-highlight {
  color: var(--text-primary);
  font-weight: 500;
}

/* ------------------------------------------------
   Skills Section
   ------------------------------------------------ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.skill-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  opacity: 0;
  transition: var(--transition-base);
}

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

.skill-card:hover::before {
  opacity: 1;
}

.skill-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-primary-dim);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.5rem;
}

.skill-card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.skill-tag:hover {
  color: var(--accent-primary);
  background: var(--accent-primary-dim);
}

/* ------------------------------------------------
   Experience Section
   ------------------------------------------------ */
.experience {
  background: var(--bg-secondary);
}

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary), var(--border-color));
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  padding-bottom: var(--space-xl);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: 12px;
  top: 4px;
  width: 18px;
  height: 18px;
  background: var(--bg-primary);
  border: 2px solid var(--accent-primary);
  border-radius: 50%;
  z-index: 1;
}

.timeline-item:hover .timeline-marker {
  background: var(--accent-primary);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: var(--transition-base);
}

.timeline-item:hover .timeline-content {
  border-color: var(--accent-primary);
}

.timeline-header {
  margin-bottom: var(--space-md);
}

.timeline-role {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.timeline-company {
  color: var(--accent-primary);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.timeline-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.timeline-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.timeline-description {
  list-style: none;
}

.timeline-description li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.timeline-description li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
}

/* ------------------------------------------------
   Projects Section
   ------------------------------------------------ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: var(--transition-base);
  display: flex;
  flex-direction: column;
}

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

.project-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-primary-dim), var(--accent-secondary-dim));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.5rem;
}

.project-card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.project-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  flex-grow: 1;
  margin-bottom: var(--space-md);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.project-tag {
  padding: var(--space-xs) var(--space-sm);
  background: var(--accent-primary-dim);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-primary);
  transition: var(--transition-fast);
}

.project-tag:hover {
  border-color: var(--accent-primary);
}

.project-links {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-subtle);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.8rem;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

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

.project-link svg {
  width: 14px;
  height: 14px;
}

.projects-more {
  text-align: center;
  margin-top: var(--space-xl);
}

.projects-more a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--accent-primary);
  font-weight: 500;
  font-size: 1rem;
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--accent-primary);
  border-radius: var(--radius-md);
  transition: var(--transition-base);
}

.projects-more a:hover {
  background: var(--accent-primary-dim);
  box-shadow: 0 0 20px var(--accent-primary-glow);
}

.projects-more a svg {
  width: 20px;
  height: 20px;
}

/* ------------------------------------------------
   Blog Section
   ------------------------------------------------ */
.blog {
  background: var(--bg-secondary);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: var(--transition-base);
  display: block;
}

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

.blog-card-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-primary-dim);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.25rem;
}

.blog-card h3 {
  font-size: 1rem;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
  line-height: 1.4;
}

.blog-card .blog-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.blog-card .blog-lang {
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-secondary);
}

/* ------------------------------------------------
   Contact Section
   ------------------------------------------------ */
.contact {
  text-align: center;
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

.contact-tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: var(--transition-base);
}

.contact-link:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

.contact-link svg {
  width: 20px;
  height: 20px;
}

.contact-cta {
  font-size: 1rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ------------------------------------------------
   Footer
   ------------------------------------------------ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-lg) 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.footer-text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-text a {
  color: var(--accent-primary);
  transition: var(--transition-fast);
}

.footer-text a:hover {
  text-decoration: underline;
}

/* ------------------------------------------------
   Responsive Design
   ------------------------------------------------ */
@media (max-width: 1024px) {
  :root {
    --container-padding: 1.25rem;
  }

  section {
    padding: var(--space-xl) 0;
  }
}

@media (max-width: 768px) {
  .hero {
    min-height: auto;
    padding: 120px 0 var(--space-xl);
  }

  .hero-badges {
    justify-content: flex-start;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .timeline::before {
    left: 16px;
  }

  .timeline-item {
    padding-left: 48px;
  }

  .timeline-marker {
    left: 8px;
  }

  .timeline-meta {
    flex-direction: column;
    gap: var(--space-xs);
  }

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

@media (max-width: 480px) {
  :root {
    --container-padding: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .section-header h2::before,
  .section-header h2::after {
    width: 24px;
  }

  .contact-links {
    flex-direction: column;
  }

  .contact-link {
    width: 100%;
    justify-content: center;
  }
}

/* ------------------------------------------------
   Utility Classes
   ------------------------------------------------ */
.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;
}

/* ------------------------------------------------
   Scroll Animations (Optional Enhancement)
   ------------------------------------------------ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}