/* ============================================================
   HRICHIK KHANDAIT — GOD-LEVEL PORTFOLIO v2
   Design System & Styles
   ============================================================ */

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

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Palette – Dark */
  --bg-primary: #06080d;
  --bg-secondary: #0c1117;
  --bg-card: rgba(14, 20, 30, 0.7);
  --bg-card-hover: rgba(20, 28, 42, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-glass: rgba(255, 255, 255, 0.06);
  --text-primary: #f0f2f5;
  --text-secondary: #8892a4;
  --text-muted: #4a5568;

  /* Accent Gradients */
  --accent-1: #6366f1;    /* Indigo */
  --accent-2: #8b5cf6;    /* Violet */
  --accent-3: #a78bfa;    /* Light violet */
  --accent-4: #c084fc;    /* Purple */
  --accent-5: #818cf8;    /* Light indigo */
  --glow-primary: rgba(99, 102, 241, 0.35);
  --glow-secondary: rgba(139, 92, 246, 0.25);
  --gradient-text: linear-gradient(135deg, #818cf8 0%, #c084fc 50%, #f472b6 100%);
  --gradient-accent: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  --gradient-card: linear-gradient(135deg, rgba(99,102,241,0.08) 0%, rgba(139,92,246,0.04) 100%);

  /* Layout */
  --max-width: 1200px;
  --section-padding: 120px;
  --card-radius: 20px;
  --nav-height: 72px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- Light Mode ---------- */
body.light-mode {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fc;
  --bg-card: rgba(255, 255, 255, 1);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.9);
  --border-glass: rgba(99, 102, 241, 0.18);
  --text-primary: #0a0f1e;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --glow-primary: rgba(99, 102, 241, 0.18);
  --glow-secondary: rgba(139, 92, 246, 0.12);
  --gradient-card: linear-gradient(135deg, rgba(99,102,241,0.04) 0%, rgba(139,92,246,0.02) 100%);
  --gradient-text: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #db2777 100%);
}

body.light-mode .noise-overlay {
  opacity: 0.015;
}

body.light-mode .cursor-glow {
  background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
}

body.light-mode .section-divider hr {
  background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.15), transparent);
}

/* Light mode cards get subtle shadows */
body.light-mode .skill-category-card,
body.light-mode .project-card,
body.light-mode .hobby-card,
body.light-mode .more-card,
body.light-mode .timeline-card,
body.light-mode .about-highlight-card {
  box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.04);
  border-color: rgba(99, 102, 241, 0.12);
}

body.light-mode .skill-category-card:hover,
body.light-mode .project-card:hover,
body.light-mode .hobby-card:hover,
body.light-mode .more-card:hover,
body.light-mode .timeline-card:hover,
body.light-mode .about-highlight-card:hover {
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1), 0 8px 30px rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.25);
}

body.light-mode .contact-link {
  background: #f8f9fc;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

body.light-mode .contact-link:hover {
  background: rgba(99, 102, 241, 0.06);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.12);
}

body.light-mode .hero-badge {
  background: #f0f1ff;
  border-color: rgba(99, 102, 241, 0.15);
}

body.light-mode .skill-tag {
  background: #eef0ff;
  border-color: rgba(99, 102, 241, 0.15);
  color: #4338ca;
}

body.light-mode .skill-tag:hover {
  background: #ddd8ff;
  color: #3730a3;
}

body.light-mode .nav-logo-icon {
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.2);
}

body.light-mode .back-to-top {
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.25);
}

body.light-mode .footer {
  background: #f8f9fc;
  border-color: rgba(99, 102, 241, 0.1);
}

body.light-mode .about-image-card {
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

body.light-mode .cert-card {
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

body.light-mode .cert-card:hover {
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.12);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background var(--transition-medium), color var(--transition-medium);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Custom Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent-1), var(--accent-2));
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent-2), var(--accent-4));
}

/* ---------- Selection ---------- */
::selection {
  background: rgba(99, 102, 241, 0.3);
  color: var(--text-primary);
}

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

/* ---------- Noise Overlay ---------- */
.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px;
}

/* ---------- Cursor Glow (Custom) ---------- */
.cursor-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-primary) 0%, transparent 70%);
  pointer-events: none;
  z-index: 1;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s;
  will-change: transform;
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 2rem;
  transition: all var(--transition-medium);
}

.navbar.scrolled {
  background: rgba(6, 8, 13, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-glass);
}

body.light-mode .navbar.scrolled {
  background: rgba(250, 251, 255, 0.85);
}

.navbar-inner {
  max-width: var(--max-width);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  box-shadow: 0 4px 15px var(--glow-primary);
  transition: transform var(--transition-spring), box-shadow var(--transition-medium);
}

.nav-logo:hover .nav-logo-icon {
  transform: rotate(-8deg) scale(1.1);
  box-shadow: 0 8px 25px var(--glow-primary);
}

.nav-logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 10px;
  transition: all var(--transition-fast);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transition: all var(--transition-fast);
  transform: translateX(-50%);
}

.nav-links a:hover::after {
  width: 20px;
}

/* Theme Toggle */
.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  border-color: var(--accent-1);
  background: rgba(99, 102, 241, 0.1);
  transform: scale(1.05);
}

/* Mobile Nav Toggle */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

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

.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================================
   SECTIONS – COMMON
   ============================================================ */
.section {
  position: relative;
  z-index: 2;
  padding: var(--section-padding) 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-3);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
}

.section-label::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: calc(var(--nav-height) + 40px);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 80px;
  align-items: center;
  width: 100%;
}

.hero-text {
  max-width: 650px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 100px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  backdrop-filter: blur(10px);
  animation: fadeInUp 0.8s ease forwards;
}

.hero-badge .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.4); }
  50% { opacity: 0.8; box-shadow: 0 0 0 6px rgba(52, 211, 153, 0); }
}

.hero-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(3rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 8px;
  animation: fadeInUp 0.8s ease 0.1s forwards;
  opacity: 0;
}

.hero-name .gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-role {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.15rem;
  color: var(--accent-3);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  animation: fadeInUp 0.8s ease 0.2s forwards;
  opacity: 0;
}

.hero-role .cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent-3);
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 520px;
  animation: fadeInUp 0.8s ease 0.3s forwards;
  opacity: 0;
}

.hero-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  animation: fadeInUp 0.8s ease 0.4s forwards;
  opacity: 0;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--gradient-accent);
  color: #fff;
  border: none;
  border-radius: 14px;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-medium);
  box-shadow: 0 8px 30px var(--glow-primary);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px var(--glow-primary);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  border-radius: 14px;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-medium);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  border-color: var(--accent-1);
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-2px);
}

/* Hero Image */
.hero-image-container {
  position: relative;
  animation: fadeInUp 0.8s ease 0.5s forwards;
  opacity: 0;
}

.hero-image-wrapper {
  width: 320px;
  height: 320px;
  position: relative;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 32px;
  position: relative;
  z-index: 2;
  border: 2px solid var(--border-glass);
}

.hero-image-glow {
  position: absolute;
  inset: -20px;
  border-radius: 50px;
  background: radial-gradient(ellipse at center, var(--glow-primary) 0%, transparent 70%);
  z-index: 1;
  animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.05); }
}

.hero-orbit {
  position: absolute;
  border: 1px dashed var(--border-glass);
  border-radius: 50%;
  z-index: 0;
}

.hero-orbit-1 {
  inset: -40px;
  animation: spin 20s linear infinite;
}
.hero-orbit-2 {
  inset: -80px;
  animation: spin 30s linear infinite reverse;
}
.hero-orbit-3 {
  inset: -120px;
  animation: spin 40s linear infinite;
  opacity: 0.5;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.orbit-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-1);
  box-shadow: 0 0 10px var(--accent-1);
}

.orbit-dot-1 { top: 0; left: 50%; transform: translate(-50%, -50%); }
.orbit-dot-2 { bottom: 20%; right: 0; transform: translate(50%, 50%); }
.orbit-dot-3 { top: 30%; left: 0; transform: translate(-50%, -50%); background: var(--accent-4); box-shadow: 0 0 10px var(--accent-4); }

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 48px;
  animation: fadeInUp 0.8s ease 0.5s forwards;
  opacity: 0;
}

.hero-stat {
  text-align: left;
}

.hero-stat-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.hero-stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.9;
}

.about-text p + p {
  margin-top: 1.2rem;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}

.about-highlight-card {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  transition: all var(--transition-medium);
  backdrop-filter: blur(10px);
}

.about-highlight-card:hover {
  border-color: var(--accent-1);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--glow-secondary);
}

.about-highlight-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.about-highlight-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.about-highlight-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* About Image */
.about-image-section {
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-image-card {
  width: 380px;
  height: 450px;
  border-radius: 24px;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--border-glass);
  background: var(--bg-card);
}

.about-image-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.about-image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(6, 8, 13, 0.9) 100%);
}

.about-image-info {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
}

.about-image-info h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  color: #fff;
}

.about-image-info p {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
}

/* ============================================================
   EDUCATION – TIMELINE
   ============================================================ */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 48px auto 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-1), var(--accent-4), transparent);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-left: 72px;
  padding-bottom: 48px;
}

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

.timeline-dot {
  position: absolute;
  left: 15px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent-1);
  z-index: 2;
  transition: all var(--transition-medium);
}

.timeline-item:hover .timeline-dot {
  background: var(--accent-1);
  box-shadow: 0 0 20px var(--glow-primary);
  transform: scale(1.2);
}

.timeline-card {
  padding: 24px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius);
  transition: all var(--transition-medium);
  backdrop-filter: blur(10px);
}

.timeline-card:hover {
  border-color: var(--accent-1);
  background: var(--bg-card-hover);
  transform: translateX(8px);
  box-shadow: 0 8px 30px var(--glow-secondary);
}

.timeline-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent-3);
  font-weight: 500;
  margin-bottom: 8px;
}

.timeline-degree {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-school {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.timeline-location {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ============================================================
   SKILLS SECTION
   ============================================================ */
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.skill-category-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius);
  transition: all var(--transition-medium);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

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

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

.skill-category-card:hover {
  border-color: var(--accent-1);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--glow-secondary);
}

.skill-category-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
  box-shadow: 0 4px 15px var(--glow-primary);
}

.skill-category-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  padding: 6px 14px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent-3);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--accent-1);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.project-card {
  position: relative;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius);
  transition: all var(--transition-medium);
  backdrop-filter: blur(10px);
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-medium);
  border-radius: var(--card-radius);
}

.project-card:hover {
  border-color: var(--accent-1);
  transform: translateY(-8px);
  box-shadow: 0 20px 60px var(--glow-secondary);
}

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

.project-card > * {
  position: relative;
  z-index: 2;
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.project-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  transition: all var(--transition-medium);
}

.project-card:hover .project-icon {
  background: var(--gradient-accent);
  border-color: transparent;
  box-shadow: 0 4px 15px var(--glow-primary);
}

.project-link-icon {
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.project-card:hover .project-link-icon {
  color: var(--accent-3);
  transform: translate(2px, -2px);
}

.project-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.project-stack {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent-3);
  margin-bottom: 16px;
  line-height: 1.5;
}

.project-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
}

.project-description li {
  margin-bottom: 6px;
  padding-left: 4px;
  list-style: none;
  position: relative;
}

.project-description li::before {
  content: '▸';
  color: var(--accent-3);
  position: absolute;
  left: -14px;
}

/* ============================================================
   HOBBIES
   ============================================================ */
.hobbies-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
  max-width: 600px;
}

.hobby-card {
  padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius);
  text-align: center;
  transition: all var(--transition-medium);
  cursor: default;
  backdrop-filter: blur(10px);
}

.hobby-card:hover {
  border-color: var(--accent-1);
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 12px 40px var(--glow-secondary);
  background: var(--bg-card-hover);
}

.hobby-emoji {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
  transition: transform var(--transition-spring);
}

.hobby-card:hover .hobby-emoji {
  transform: scale(1.2) rotate(-5deg);
}

.hobby-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ============================================================
   CERTIFICATES – MARQUEE
   ============================================================ */
.certificates-section {
  padding: var(--section-padding) 0;
  position: relative;
  z-index: 2;
  overflow: hidden;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

.certificates-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  margin-bottom: 48px;
}

/* ---------- Achievements ---------- */
.achievements-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  max-width: var(--max-width);
  margin: 0 auto 56px auto;
  padding: 0 2rem;
}

.achievement-card {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius);
  transition: all var(--transition-medium);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.achievement-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-accent);
  opacity: 0.8;
}

.achievement-card:hover {
  border-color: var(--accent-1);
  transform: translateY(-5px);
  box-shadow: 0 12px 30px var(--glow-secondary);
  background: var(--bg-card-hover);
}

.achievement-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-3);
  margin-bottom: 14px;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.achievement-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.achievement-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.cert-marquee {
  display: flex;
  gap: 24px;
  animation: marquee 120s linear infinite;
  width: max-content;
  padding: 10px 0;
}

.cert-marquee:hover {
  animation-play-state: paused;
}

@keyframes marquee {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.cert-card {
  width: 300px;
  flex-shrink: 0;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-glass);
  background: var(--bg-card);
  transition: all var(--transition-medium);
}

.cert-card:hover {
  border-color: var(--accent-1);
  transform: scale(1.03);
  box-shadow: 0 12px 40px var(--glow-secondary);
}

.cert-card img {
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================================
   MORE LINKS
   ============================================================ */
.more-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
  max-width: 600px;
}

.more-card {
  padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius);
  text-align: center;
  transition: all var(--transition-medium);
  cursor: pointer;
  backdrop-filter: blur(10px);
  text-decoration: none;
  color: var(--text-primary);
  display: block;
}

.more-card:hover {
  border-color: var(--accent-1);
  transform: translateY(-6px);
  box-shadow: 0 12px 40px var(--glow-secondary);
  background: var(--bg-card-hover);
}

.more-card .hobby-emoji {
  transition: transform var(--transition-spring);
}

.more-card:hover .hobby-emoji {
  transform: scale(1.2);
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-title-big {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

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

.contact-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 48px;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.contact-link {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--text-secondary);
  transition: all var(--transition-medium);
  backdrop-filter: blur(10px);
}

.contact-link:hover {
  border-color: var(--accent-1);
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-3);
  transform: translateY(-4px);
  box-shadow: 0 8px 25px var(--glow-secondary);
}

.contact-link svg {
  width: 24px;
  height: 24px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 48px 2rem 40px;
  border-top: 1px solid var(--border-glass);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer a {
  color: var(--accent-3);
  text-decoration: none;
}

/* ---------- Visitor Counter ---------- */
.visitor-counter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.visitor-counter-icon {
  display: flex;
  align-items: center;
  gap: 4px;
}

.visitor-counter-icon svg {
  width: 16px;
  height: 16px;
  color: var(--accent-3);
}

.visitor-count-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-3);
  background: rgba(99, 102, 241, 0.08);
  padding: 4px 12px;
  border-radius: 8px;
  border: 1px solid rgba(99, 102, 241, 0.15);
  letter-spacing: 0.1em;
  min-width: 60px;
  text-align: center;
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--gradient-accent);
  color: #fff;
  border: none;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  font-size: 1.2rem;
  transition: all var(--transition-medium);
  box-shadow: 0 4px 20px var(--glow-primary);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--glow-primary);
}

.back-to-top.visible {
  display: flex;
}

/* ============================================================
   ANIMATIONS – GSAP Helpers
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ============================================================
   SECTION DIVIDERS
   ============================================================ */
.section-divider {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-divider hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-glass), transparent);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* --- TV / Ultra-wide (1920px+) --- */
@media (min-width: 1920px) {
  :root {
    --max-width: 1400px;
    --section-padding: 140px;
  }

  html {
    font-size: 18px;
  }

  .hero-image-wrapper {
    width: 380px;
    height: 380px;
  }

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

/* --- Large displays (2560px+) --- */
@media (min-width: 2560px) {
  :root {
    --max-width: 1600px;
    --section-padding: 160px;
  }

  html {
    font-size: 20px;
  }
}

/* --- Tablet / small laptop --- */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 60px;
    text-align: center;
  }

  .hero-text {
    max-width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-description {
    max-width: 520px;
  }

  .hero-image-container {
    order: -1;
  }

  .hero-image-wrapper {
    width: 260px;
    height: 260px;
  }

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

  .about-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image-section {
    order: -1;
  }

  .about-image-card {
    width: 100%;
    max-width: 380px;
    height: 350px;
  }

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

/* --- Tablet portrait --- */
@media (max-width: 768px) {
  :root {
    --section-padding: 80px;
    --nav-height: 64px;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 12px;
    z-index: 999;
  }

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

  .nav-links a {
    font-size: 1.2rem;
    padding: 12px 24px;
  }

  .nav-hamburger {
    display: flex;
  }

  .hero-name {
    font-size: clamp(2.2rem, 10vw, 3.5rem);
  }

  .hero-role {
    font-size: 0.95rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

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

  .hero-stats {
    gap: 32px;
    flex-wrap: wrap;
  }

  .hero-image-wrapper {
    width: 200px;
    height: 200px;
  }

  .hero-orbit-3 { display: none; }

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

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

  .achievements-container {
    padding: 0 1rem;
    margin-bottom: 36px;
  }

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

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

  .section-title {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
  }

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

  .timeline-item {
    padding-left: 52px;
  }

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

  .contact-links {
    gap: 12px;
  }

  .visitor-counter {
    flex-direction: column;
    gap: 8px;
  }
}

/* --- Small phones --- */
@media (max-width: 480px) {
  :root {
    --section-padding: 60px;
  }

  .section {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hobbies-grid,
  .more-grid {
    grid-template-columns: 1fr;
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
    align-items: center;
  }

  .hero-image-wrapper {
    width: 160px;
    height: 160px;
  }

  .hero-orbit-2 { display: none; }

  .about-image-card {
    height: 280px;
  }

  .contact-title-big {
    font-size: 1.8rem;
  }
}

/* --- Landscape phones --- */
@media (max-height: 500px) and (orientation: landscape) {
  :root {
    --section-padding: 60px;
    --nav-height: 56px;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + 20px);
    padding-bottom: 40px;
  }

  .hero-image-wrapper {
    width: 150px;
    height: 150px;
  }
}

/* --- Touch device optimizations --- */
@media (hover: none) and (pointer: coarse) {
  .cursor-glow {
    display: none !important;
  }

  .project-card:hover {
    transform: none !important;
  }

  .btn-primary:hover,
  .btn-secondary:hover,
  .contact-link:hover {
    transform: none;
  }
}

/* --- Reduced motion preference --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .cert-marquee {
    animation: none !important;
  }

  .hero-orbit {
    animation: none !important;
  }
}

/* ============================================================
   RESUME SECTION
   ============================================================ */
.resume-actions {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-top: 32px;
  flex-wrap: wrap;
}

.resume-viewer {
  margin-top: 32px;
  border-radius: var(--card-radius);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  background: var(--bg-card);
  animation: fadeInUp 0.4s ease forwards;
}

.resume-viewer iframe {
  background: #fff;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Certificate Modal Lightbox ---------- */
.cert-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(6, 8, 13, 0.95);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-medium);
  backdrop-filter: blur(12px);
}

.cert-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.cert-modal-close {
  position: absolute;
  top: 32px;
  left: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
  padding: 12px 20px;
  border-radius: 30px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
  z-index: 10001;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.cert-modal-close:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-1);
  transform: translateX(-4px);
  color: var(--accent-3);
  box-shadow: 0 4px 25px var(--glow-primary);
}

.cert-modal-content {
  max-width: 90%;
  max-height: 80%;
  border-radius: var(--card-radius);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  transform: scale(0.95);
  transition: transform var(--transition-medium);
}

.cert-modal.active .cert-modal-content {
  transform: scale(1);
}

.cert-modal-content img {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100vh;
  display: block;
  object-fit: contain;
}

@media (max-width: 768px) {
  .cert-modal-close {
    top: 20px;
    left: 20px;
    padding: 10px 16px;
    font-size: 0.8rem;
  }
}