/* ==========================================================================
   BERKE SARPDAĞ - SOFTWARE ENGINEER PORTFOLIO DESIGN SYSTEM
   Dark Theme, Glassmorphism, Neon Glow & Micro-animations
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  /* Color Palette */
  --bg-dark: #070a12;
  --bg-surface: #0d1322;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(26, 36, 62, 0.8);
  --bg-glass: rgba(13, 19, 34, 0.75);
  
  /* Vibrant Accents */
  --cyan-primary: #06b6d4;
  --cyan-glow: rgba(6, 182, 212, 0.35);
  --violet-primary: #8b5cf6;
  --violet-glow: rgba(139, 92, 246, 0.35);
  --emerald-primary: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.35);
  
  /* Text & Borders */
  --text-bright: #f8fafc;
  --text-sub: #cbd5e1;
  --text-muted: #64748b;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(139, 92, 246, 0.25);
  
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Layout & Spacing */
  --container-max: 1200px;
  --header-height: 80px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Global */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-bright);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Background Canvas */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
}

/* Ambient Radial Glows */
.ambient-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(140px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.4;
}

.glow-1 {
  top: -150px;
  left: -100px;
  background: radial-gradient(circle, var(--violet-primary), transparent 70%);
}

.glow-2 {
  top: 40%;
  right: -150px;
  background: radial-gradient(circle, var(--cyan-primary), transparent 70%);
}

.glow-3 {
  bottom: 5%;
  left: 20%;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.3), transparent 70%);
}

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Typography Utilities */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text-bright);
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 0%, var(--cyan-primary) 50%, var(--violet-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
  background: rgba(6, 182, 212, 0.1);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.section-header {
  margin-bottom: 3.5rem;
  text-align: center;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-sub);
  max-width: 650px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* Glassmorphism Card Style */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 12px 40px 0 rgba(139, 92, 246, 0.15);
}

/* Header & Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 100;
  transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal);
}

.navbar.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-bright);
}

.logo-badge {
  background: linear-gradient(135deg, var(--cyan-primary), var(--violet-primary));
  color: #fff;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 0 15px var(--violet-glow);
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-sub);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan-primary), var(--violet-primary));
  transition: width var(--transition-fast);
  border-radius: var(--radius-full);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-bright);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan-primary), var(--violet-primary));
  color: #fff;
  box-shadow: 0 4px 20px var(--violet-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(6, 182, 212, 0.45);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-bright);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-sub);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.45rem 1.1rem;
  font-size: 0.85rem;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  padding-top: calc(var(--header-height) + 4rem);
  padding-bottom: 6rem;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-size: 0.85rem;
  color: var(--emerald-primary);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--emerald-primary);
  box-shadow: 0 0 10px var(--emerald-primary);
  animation: pulse-ring 2s cubic-bezier(0.455, 0.03, 0.515, 0.955) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: clamp(2.8rem, 5.5vw, 4.2rem);
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-sub);
  margin-bottom: 2rem;
  max-width: 600px;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

.stat-item h4 {
  font-size: 1.8rem;
  color: var(--cyan-primary);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Developer Visual Card */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.avatar-wrapper {
  position: relative;
  width: 320px;
  height: 320px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.floating-badge {
  position: absolute;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 10;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.fb-1 {
  top: 10%;
  left: -20px;
  background: rgba(13, 19, 34, 0.9);
  border: 1px solid rgba(6, 182, 212, 0.4);
}

.fb-2 {
  bottom: 10%;
  right: -20px;
  background: rgba(13, 19, 34, 0.9);
  border: 1px solid rgba(139, 92, 246, 0.4);
}

/* Sections Global */
section {
  padding: 6rem 0;
  position: relative;
}

/* About / Bio Section */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.about-card {
  padding: 2.5rem;
}

.about-text p {
  color: var(--text-sub);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.highlight-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--text-bright);
}

.highlight-item i {
  color: var(--cyan-primary);
}

/* Skills Section */
.skills-tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-sub);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover,
.tab-btn.active {
  background: rgba(139, 92, 246, 0.15);
  border-color: var(--violet-primary);
  color: var(--text-bright);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  padding: 1.75rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  transition: all var(--transition-fast);
}

.skill-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--cyan-primary);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.skill-info h4 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.skill-info p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Projects Showcase */
.project-featured {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  padding: 2.5rem;
  margin-bottom: 3rem;
  align-items: center;
}

.project-img-wrapper {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.project-img-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-normal);
}

.project-img-wrapper:hover img {
  transform: scale(1.03);
}

.project-tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: var(--violet-primary);
  font-size: 0.8rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  margin-bottom: 1rem;
}

.project-title {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.project-desc {
  color: var(--text-sub);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.tech-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  color: var(--cyan-primary);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

/* Project Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 8, 16, 0.85);
  backdrop-filter: blur(12px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  width: 90%;
  max-width: 800px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2.5rem;
  position: relative;
  transform: scale(0.95);
  transition: transform var(--transition-fast);
}

.modal-backdrop.open .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-bright);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Architecture Timeline */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--cyan-primary), var(--violet-primary));
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-dot {
  position: absolute;
  left: -2.4rem;
  top: 0.25rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 3px solid var(--cyan-primary);
  box-shadow: 0 0 10px var(--cyan-glow);
}

.timeline-card {
  padding: 1.75rem;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan-primary);
  margin-bottom: 0.5rem;
}

/* Contact & Social Section */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-card {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2rem;
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-bright);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-btn:hover {
  background: rgba(139, 92, 246, 0.12);
  border-color: var(--violet-primary);
  transform: translateX(6px);
}

.social-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.social-info i {
  font-size: 1.5rem;
  color: var(--cyan-primary);
}

/* Notification Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 0.9rem 1.5rem;
  background: rgba(16, 185, 129, 0.9);
  backdrop-filter: blur(10px);
  color: #fff;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  z-index: 2000;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-fast);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

footer a {
  color: var(--cyan-primary);
  text-decoration: none;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid,
  .about-grid,
  .project-featured,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-visual {
    order: -1;
  }

  .avatar-wrapper {
    width: 260px;
    height: 260px;
  }

  .nav-links {
    display: none;
  }
}