/* ═══════════════════════════════════════════════════════
   YF CODE — CV Portfolio | Design System
   AI & Software Themed | Premium Dark Mode
   ═══════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

/* ── CSS Custom Properties ─────────────────────────── */
:root {
  /* Primary Palette */
  --color-bg-deep: #05080f;
  --color-bg-primary: #0a0e1a;
  --color-bg-secondary: #0d1224;
  --color-bg-card: rgba(13, 18, 36, 0.6);
  --color-bg-glass: rgba(15, 23, 42, 0.45);
  --color-bg-glass-hover: rgba(20, 30, 55, 0.6);

  /* Accent Colors */
  --color-cyan: #06d6a0;
  --color-cyan-glow: rgba(6, 214, 160, 0.3);
  --color-purple: #a855f7;
  --color-purple-glow: rgba(168, 85, 247, 0.3);
  --color-blue: #3b82f6;
  --color-blue-glow: rgba(59, 130, 246, 0.25);
  --color-pink: #ec4899;
  --color-orange: #f97316;
  --color-yellow: #eab308;

  /* Text Colors */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: var(--color-cyan);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  --gradient-card: linear-gradient(135deg, rgba(6, 214, 160, 0.08), rgba(168, 85, 247, 0.08));
  --gradient-border: linear-gradient(135deg, var(--color-cyan), var(--color-purple), var(--color-blue));
  --gradient-hero: linear-gradient(180deg, transparent 0%, var(--color-bg-deep) 100%);

  /* Borders */
  --border-subtle: rgba(148, 163, 184, 0.08);
  --border-glass: rgba(148, 163, 184, 0.12);
  --border-accent: rgba(6, 214, 160, 0.25);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow-cyan: 0 0 30px var(--color-cyan-glow);
  --shadow-glow-purple: 0 0 30px var(--color-purple-glow);

  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --section-padding: clamp(4rem, 8vw, 8rem);
  --container-max: 1200px;
  --container-padding: clamp(1.25rem, 4vw, 3rem);

  /* Transitions */
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 200ms var(--ease-smooth);
  --transition-base: 350ms var(--ease-smooth);
  --transition-slow: 600ms var(--ease-smooth);

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--color-cyan);
  color: var(--color-bg-deep);
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

/* ── Scrollbar ─────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg-deep);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(to bottom, var(--color-cyan), var(--color-purple));
  border-radius: var(--radius-full);
}

/* ── Loading Screen ────────────────────────────────── */
.loader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--color-bg-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 2rem;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-ring {
  width: 60px;
  height: 60px;
  border: 3px solid var(--border-glass);
  border-top-color: var(--color-cyan);
  border-right-color: var(--color-purple);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loader-text {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 3px;
  text-transform: uppercase;
}

.loader-text::after {
  content: '';
  animation: dots 1.5s steps(3) infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes dots {
  0%   { content: ''; }
  33%  { content: '.'; }
  66%  { content: '..'; }
  100% { content: '...'; }
}

/* ── Particle Canvas ───────────────────────────────── */
#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ── Navigation ────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition-base);
  backdrop-filter: blur(0px);
}

.navbar.scrolled {
  background: rgba(5, 8, 15, 0.85);
  backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.65rem 0;
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
}

.nav-logo-img {
  height: 48px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  filter: drop-shadow(0 2px 8px rgba(6, 214, 160, 0.25));
  transition: transform var(--transition-fast), filter var(--transition-fast);
}

.nav-logo:hover .nav-logo-img {
  transform: scale(1.06);
  filter: drop-shadow(0 4px 14px rgba(6, 214, 160, 0.45));
}

.footer-logo-img {
  height: 44px;
  width: auto;
  max-width: 150px;
  object-fit: contain;
  filter: drop-shadow(0 2px 6px rgba(6, 214, 160, 0.2));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--color-bg-glass);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-cyan);
  box-shadow: 0 0 8px var(--color-cyan);
}

.nav-cta {
  padding: 0.55rem 1.5rem;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  color: var(--color-bg-deep) !important;
  font-weight: 600;
  font-size: 0.85rem;
  margin-left: 0.5rem;
  transition: var(--transition-fast);
  box-shadow: 0 0 20px var(--color-cyan-glow);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--color-cyan-glow), 0 4px 15px rgba(0,0,0,0.3);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

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

/* ── Hero Section ──────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(5, 8, 15, 0.3) 0%,
    rgba(5, 8, 15, 0.6) 50%,
    var(--color-bg-deep) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 0 var(--container-padding);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.2rem;
  border-radius: var(--radius-full);
  background: var(--color-bg-glass);
  border: 1px solid var(--border-accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-cyan);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 2rem;
  animation: fadeInDown 0.8s var(--ease-smooth) 0.3s both;
}

.hero-badge .pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-cyan);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--color-cyan-glow); }
  50% { opacity: 0.7; box-shadow: 0 0 0 8px transparent; }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  animation: fadeInUp 0.8s var(--ease-smooth) 0.5s both;
}

.hero-title .line {
  display: block;
}

.hero-title .gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.8s var(--ease-smooth) 0.65s both;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
  animation: fadeInUp 0.8s var(--ease-smooth) 0.8s both;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s var(--ease-smooth) 0.95s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 40px var(--color-cyan-glow), 0 8px 25px rgba(0,0,0,0.3);
}

.btn-secondary {
  background: var(--color-bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--color-bg-glass-hover);
  border-color: var(--color-cyan);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

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

.hero-scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  animation: fadeIn 1s var(--ease-smooth) 1.5s both;
}

.scroll-mouse {
  width: 24px;
  height: 38px;
  border: 2px solid var(--border-glass);
  border-radius: 12px;
  position: relative;
}

.scroll-mouse::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--color-cyan);
  border-radius: 3px;
  animation: scroll-anim 2s ease-in-out infinite;
}

@keyframes scroll-anim {
  0%, 100% { opacity: 1; top: 8px; }
  50% { opacity: 0.3; top: 20px; }
}

.scroll-text {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ── Section Styles ────────────────────────────────── */
.section {
  position: relative;
  padding: var(--section-padding) 0;
  z-index: 1;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  background: var(--color-bg-glass);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-cyan);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.section-tag svg {
  width: 14px;
  height: 14px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-title .gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ── About Section ─────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: center;
}

.about-visual {
  position: relative;
}

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-image-wrapper::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: var(--radius-lg);
  background: var(--gradient-border);
  z-index: -1;
  opacity: 0.5;
}

.about-image-wrapper img {
  width: 100%;
  border-radius: var(--radius-lg);
  aspect-ratio: 3/4;
  object-fit: cover;
  object-position: top;
}

.about-float-card {
  position: absolute;
  bottom: -20px;
  right: -20px;
  padding: 1rem 1.5rem;
  background: var(--color-bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.about-float-card .icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.about-float-card .info .label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.about-float-card .info .value {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-cyan);
}

.about-content h3 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.about-text {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.85;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  background: var(--color-bg-glass);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-fast);
}

.highlight-item:hover {
  border-color: var(--color-cyan);
  background: var(--color-bg-glass-hover);
  transform: translateX(4px);
}

.highlight-item .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-cyan);
  flex-shrink: 0;
}

.highlight-item span {
  font-size: 0.9rem;
  font-weight: 500;
}

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

.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── Skills Section ────────────────────────────────── */
.skills-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.5rem;
}

.skill-category {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--color-bg-glass);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.skill-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition-base);
}

.skill-category:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

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

.skill-category-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.skill-category-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.skill-category-icon.ai { background: rgba(6, 214, 160, 0.15); }
.skill-category-icon.dev { background: rgba(59, 130, 246, 0.15); }
.skill-category-icon.data { background: rgba(168, 85, 247, 0.15); }
.skill-category-icon.tools { background: rgba(249, 115, 22, 0.15); }

.skill-category-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
}

.skill-category-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

.skill-tag {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  cursor: default;
}

.skill-tag:hover {
  background: var(--color-bg-glass-hover);
  border-color: var(--color-cyan);
  color: var(--color-cyan);
  transform: scale(1.05);
}

/* ── Experience Section ────────────────────────────── */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 30px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--color-cyan),
    var(--color-purple),
    var(--color-blue),
    transparent
  );
}

.timeline-item {
  position: relative;
  padding-left: 80px;
  margin-bottom: 3rem;
}

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

.timeline-dot {
  position: absolute;
  left: 20px;
  top: 6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-bg-deep);
  border: 3px solid var(--color-cyan);
  z-index: 2;
  box-shadow: 0 0 15px var(--color-cyan-glow);
  transition: var(--transition-fast);
}

.timeline-item:hover .timeline-dot {
  background: var(--color-cyan);
  box-shadow: 0 0 25px var(--color-cyan-glow);
  transform: scale(1.2);
}

.timeline-card {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--color-bg-glass);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
  transition: var(--transition-base);
}

.timeline-card:hover {
  border-color: var(--border-accent);
  transform: translateX(8px);
  box-shadow: var(--shadow-lg);
}

.timeline-date {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(6, 214, 160, 0.1);
  border: 1px solid rgba(6, 214, 160, 0.2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-cyan);
  margin-bottom: 1rem;
}

.timeline-role {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-size: 1rem;
  color: var(--color-purple);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.timeline-location {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.timeline-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.timeline-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.timeline-skill-tag {
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.2);
  font-size: 0.7rem;
  color: var(--color-purple);
  font-weight: 500;
}

/* ── Projects Section ──────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 2rem;
}

.project-card {
  position: relative;
  border-radius: var(--radius-lg);
  background: var(--color-bg-glass);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  transition: var(--transition-base);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(6, 214, 160, 0.08);
}

.project-visual {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.project-visual-bg {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  position: relative;
}

.project-visual-bg.optistock { background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%); }
.project-visual-bg.optifilo { background: linear-gradient(135deg, #0f172a 0%, #1a2744 100%); }
.project-visual-bg.guvenli { background: linear-gradient(135deg, #0f172a 0%, #162032 100%); }
.project-visual-bg.yfhome { background: linear-gradient(135deg, #0f172a 0%, #0d2818 100%); }

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease-smooth);
}

.project-card:hover .project-img {
  transform: scale(1.05);
}

.project-visual-bg .project-icon-large {
  font-size: 4rem;
  opacity: 0.6;
  z-index: 1;
}

.project-visual-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--color-bg-glass) 0%, transparent 60%);
}

.project-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  background: var(--color-bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-glass);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-cyan);
  letter-spacing: 1px;
  text-transform: uppercase;
  z-index: 2;
}

.project-content {
  padding: 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.project-subtitle {
  font-size: 0.85rem;
  color: var(--color-purple);
  font-weight: 500;
  margin-bottom: 1rem;
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.project-tech-tag {
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(6, 214, 160, 0.08);
  border: 1px solid rgba(6, 214, 160, 0.15);
  font-size: 0.72rem;
  color: var(--color-cyan);
  font-weight: 500;
}

.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-cyan);
  transition: var(--transition-fast);
}

.project-link:hover {
  gap: 0.7rem;
}

.project-link svg {
  width: 16px;
  height: 16px;
}

.project-award {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(234, 179, 8, 0.12);
  border: 1px solid rgba(234, 179, 8, 0.25);
  font-size: 0.7rem;
  color: var(--color-yellow);
  font-weight: 600;
}

/* ── Education Section ─────────────────────────────── */
.education-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.education-card {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--color-bg-glass);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.education-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease-smooth);
}

.education-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.education-card:hover::before {
  transform: scaleX(1);
}

.education-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.education-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.education-info {
  flex: 1;
}

.education-school {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.education-degree {
  font-size: 0.9rem;
  color: var(--color-purple);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.education-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.education-focus {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.education-focus-tag {
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  font-size: 0.72rem;
  color: var(--color-blue);
  font-weight: 500;
}

/* ── Contact Section ───────────────────────────────── */
.contact-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.contact-card {
  padding: 2rem;
  border-radius: var(--radius-lg);
  background: var(--color-bg-glass);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
  text-align: center;
  transition: var(--transition-base);
  cursor: pointer;
}

.contact-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-5px) scale(1.02);
  box-shadow: var(--shadow-glow-cyan);
}

.contact-card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin: 0 auto 1rem;
}

.contact-card-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.contact-card-value {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.contact-card-wide {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.75rem;
  padding: 1.5rem 2.5rem;
  text-align: left;
}

.contact-card-wide .contact-card-icon {
  margin: 0;
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  font-size: 1.5rem;
}

.contact-card-wide .contact-card-wide-info {
  display: flex;
  flex-direction: column;
}

.contact-card-wide .contact-card-title {
  margin-bottom: 0.2rem;
  font-size: 1rem;
}

.contact-card-wide .contact-card-value {
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .contact-card-wide {
    grid-column: auto;
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
    padding: 2rem;
  }
  .contact-card-wide .contact-card-icon {
    margin: 0 auto 0.75rem;
  }
}

.contact-cta {
  text-align: center;
  padding: 3rem;
  border-radius: var(--radius-xl);
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.contact-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, var(--color-cyan-glow), transparent 70%);
  opacity: 0.15;
}

.contact-cta h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1rem;
  position: relative;
}

.contact-cta p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  position: relative;
}

.contact-cta .btn {
  position: relative;
}

/* ── Footer ────────────────────────────────────────── */
.footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border-subtle);
  position: relative;
  z-index: 1;
}

.footer-content {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-brand .nav-logo-icon {
  width: 32px;
  height: 32px;
  font-size: 0.7rem;
}

.footer-brand span {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-link {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-cyan);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.footer-copy .heart {
  color: var(--color-pink);
}

/* ── Scroll Reveal Animations ──────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.reveal-scale.revealed {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delays */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }

/* ── Keyframe Animations ──────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ── Glitch Text Effect ───────────────────────────── */
.glitch {
  position: relative;
}

/* ── Typing Effect ─────────────────────────────────── */
.typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1.1em;
  background: var(--color-cyan);
  margin-left: 4px;
  animation: blink-cursor 0.8s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ── Magnetic Effect for Buttons ───────────────────── */
.magnetic {
  transition: transform 0.3s var(--ease-smooth);
}

/* ── Grid Pattern Overlay ──────────────────────────── */
.grid-pattern {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: 
    linear-gradient(rgba(148, 163, 184, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .about-visual {
    max-width: 400px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(5, 8, 15, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    z-index: 999;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-link {
    font-size: 1.2rem;
    padding: 0.75rem 1.5rem;
  }

  .nav-cta {
    font-size: 1rem;
    padding: 0.75rem 2rem;
    margin-left: 0;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .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);
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 3.5rem);
  }

  .about-highlights {
    grid-template-columns: 1fr;
  }

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

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

  .education-cards {
    grid-template-columns: 1fr;
  }

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

  .timeline-item {
    padding-left: 55px;
  }

  .timeline-dot {
    left: 8px;
    width: 18px;
    height: 18px;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

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

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

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

  .contact-grid {
    grid-template-columns: 1fr;
  }

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

  .stat-number {
    font-size: 1.5rem;
  }
}