/* ===========================
   Harsh Thakkar Portfolio
   Dark Mode Professional Design
   =========================== */

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

/* ===========================
   CSS Variables / Design System
   =========================== */
:root {
  /* Colors */
  --bg-primary: #0a0a0b;
  --bg-secondary: #111113;
  --bg-tertiary: #18181b;
  --bg-card: #1c1c1f;
  --bg-card-hover: #232326;
  
  /* Text Colors */
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  
  /* Accent Colors */
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-dark: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.15);
  
  /* Gradient */
  --gradient-accent: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  
  /* Borders */
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-light: rgba(255, 255, 255, 0.12);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --section-padding: 100px 0;
  --container-max: 1200px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

/* ===========================
   Utility Classes
   =========================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ===========================
   Loader
   =========================== */
.loader {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  text-align: center;
}

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 16px;
}

.loader-text {
  color: var(--text-secondary);
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

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

/* ===========================
   Ambient Background
   =========================== */
.ambient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: -1;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.4;
  animation: float 20s infinite ease-in-out;
}

.ambient-orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  top: -200px;
  right: -100px;
  animation-delay: 0s;
}

.ambient-orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, transparent 70%);
  bottom: -100px;
  left: -150px;
  animation-delay: -7s;
}

.ambient-orb-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -14s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(20px, -20px) scale(1.05); }
  50% { transform: translate(-10px, 20px) scale(0.95); }
  75% { transform: translate(-20px, -10px) scale(1.02); }
}

/* ===========================
   Navigation
   =========================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--transition-base);
}

.nav.scrolled {
  padding: 12px 0;
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
}

.logo-text {
  font-size: 24px;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  position: relative;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: calc(100% - 32px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}

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

.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);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    padding: 80px 32px;
    transition: right var(--transition-base);
    border-left: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .nav-link {
    width: 100%;
    padding: 16px;
    font-size: 16px;
    text-align: center;
  }
  
  .nav-link::after {
    bottom: 12px;
  }
}

/* ===========================
   Hero Section
   =========================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  position: relative;
}

.hero-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--accent-glow);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
  margin-bottom: 20px;
}

.hero-greeting {
  display: block;
  font-size: 18px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.hero-name {
  display: block;
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  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-subtitle {
  font-size: 20px;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 16px;
  min-height: 30px;
}

.typing-cursor {
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero-description {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 500px;
  margin-bottom: 32px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-social {
  display: flex;
  gap: 12px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

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

/* Hero Visual */
.hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

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

.hero-image-glow {
  position: absolute;
  inset: -20px;
  background: var(--gradient-accent);
  border-radius: 50%;
  opacity: 0.2;
  filter: blur(40px);
  animation: glow-pulse 4s infinite ease-in-out;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.2; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(1.05); }
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--bg-tertiary);
  position: relative;
  z-index: 1;
}

/* Hero Signature SVG Animation */
.hero-signature-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  padding: 20px;
}

.signature-svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

/* Signature path stroke animation */
.signature-path {
  stroke-dasharray: 1500;
  stroke-dashoffset: 1500;
}

.signature-harsh {
  animation: drawSignatureHarsh 2.2s ease-out forwards;
  animation-delay: 0.3s;
}

.signature-thakkar {
  animation: drawSignatureThakkar 2.5s ease-out forwards;
  animation-delay: 1.8s;
}

@keyframes drawSignatureHarsh {
  0% {
    stroke-dashoffset: 1500;
  }
  100% {
    stroke-dashoffset: 0;
  }
}

@keyframes drawSignatureThakkar {
  0% {
    stroke-dashoffset: 1500;
  }
  100% {
    stroke-dashoffset: 0;
  }
}

/* Tooltip Style */
.tooltip {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.tooltip-text {
  position: absolute;
  bottom: 105%;
  left: 50%;
  transform: translateX(-50%);
  
  background-color: #2f2f2f;      /* dark gray */
  color: #d3d3d3;                 /* light gray text */
  
  padding: 6px 10px;
  border-radius: 999px;           /* circular/rounded rectangle */
  font-size: 12px;
  font-weight: 500;
  
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.tooltip:hover .tooltip-text {
  opacity: 1;
  transform: translateX(-50%) translateY(-4px);
}


.hero-stats {
  display: flex;
  gap: 24px;
  margin-top: 32px;
}

.stat-card {
  text-align: center;
  padding: 20px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--border-color-light);
  transform: translateY(-2px);
}

.stat-number {
  display: block;
  font-size: 32px;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 1px;
  animation: bounce 2s infinite;
}

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

.mouse-wheel {
  width: 4px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll-wheel 2s infinite;
}

@keyframes scroll-wheel {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-8px); }
  60% { transform: translateX(-50%) translateY(-4px); }
}

/* ===========================
   Buttons
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-accent);
  color: white;
  box-shadow: var(--shadow-md), 0 0 20px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(59, 130, 246, 0.4);
}

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

.btn-secondary:hover {
  border-color: var(--border-color-light);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

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

/* ===========================
   Section Styles
   =========================== */
.section {
  padding: var(--section-padding);
  position: relative;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 60px;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===========================
   About Section
   =========================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin: 32px 0;
}

.highlight-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.highlight-item:hover {
  border-color: var(--border-color-light);
  transform: translateX(4px);
}

.highlight-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-md);
  color: var(--accent);
}

.highlight-content h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.highlight-content p {
  font-size: 14px;
  color: var(--text-muted);
}

/* Code Window */
.code-window {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-dots span:nth-child(1) { background: #ef4444; }
.code-dots span:nth-child(2) { background: #eab308; }
.code-dots span:nth-child(3) { background: #22c55e; }

.code-title {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.code-content {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-secondary);
  overflow-x: auto;
}

.code-content code {
  color: var(--accent-light);
}

/* ===========================
   Certificates Section
   =========================== */
.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.certificate-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-base);
  cursor: pointer;
}

.certificate-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.certificate-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}

.certificate-logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: white;
  padding: 4px;
}

.certificate-info {
  flex: 1;
}

.certificate-info h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.3;
}

.certificate-info p {
  font-size: 13px;
  color: var(--text-muted);
}

.certificate-date {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.certificate-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--accent-glow);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-light);
}

/* ===========================
   Skills Section
   =========================== */
.skills-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.skill-tab {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.skill-tab:hover {
  color: var(--text-primary);
  border-color: var(--border-color-light);
}

.skill-tab.active {
  background: var(--gradient-accent);
  color: white;
  border-color: transparent;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}

.skill-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

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

.skill-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-icon img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.skill-name {
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  color: var(--text-secondary);
}

.skill-card:hover .skill-name {
  color: var(--text-primary);
}

/* ===========================
   Projects Section
   =========================== */
.projects-filter {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-color-light);
}

.filter-btn.active {
  background: var(--gradient-accent);
  color: white;
  border-color: transparent;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
}

.blogs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

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

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

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

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  opacity: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 24px;
  gap: 12px;
  transition: opacity var(--transition-base);
}

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

.project-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: var(--accent);
  transform: translateY(-2px);
}

.project-content {
  padding: 24px;
}

.project-category {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-glow);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.project-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.project-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag {
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--text-muted);
}

/* ===========================
   Education Section
   =========================== */
.education-timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-left: 40px;
}

.education-timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}

.education-item {
  position: relative;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  transition: all var(--transition-fast);
}

.education-item:hover {
  border-color: var(--border-color-light);
  transform: translateX(8px);
}

.education-item::before {
  content: '';
  position: absolute;
  left: -33px;
  top: 40px;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  border: 4px solid var(--bg-primary);
}

.education-date {
  display: inline-block;
  padding: 6px 12px;
  background: var(--accent-glow);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.education-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.education-school {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.education-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 3rem;
}

.education-column {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.column-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
  .education-grid {
    grid-template-columns: 1fr;
  }
}

.research-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.research-link:hover .education-item {
  transform: translateY(-4px);
  transition: transform 0.2s ease;
  cursor: pointer;
}

.education-title-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.redirect-icon {
  font-size: 0.85em;
  opacity: 0.7;
}



/* ===========================
   Contact Section
   =========================== */
.social-icon i {
  font-size: 20px;
  color: #1DA1F2; /* Twitter blue */
  transition: transform 0.2s ease;
}

.social-icon i:hover {
  transform: scale(1.1);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 60px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-card {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.contact-card:hover {
  border-color: var(--border-color-light);
  transform: translateX(4px);
}

.contact-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-md);
  color: var(--accent);
}

.contact-details h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
}

.contact-details a,
.contact-details p {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.contact-details a:hover {
  color: var(--accent);
}

.contact-social {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.contact-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.contact-social a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* Contact Form */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 14px;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===========================
   Footer
   =========================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 24px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-brand .logo-text {
  font-size: 28px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  max-width: 250px;
}

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.footer-bottom p {
  font-size: 14px;
  color: var(--text-muted);
}

/* ===========================
   Modal
   =========================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  max-width: 800px;
  max-height: 90vh;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  animation: modal-in 0.3s ease;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  z-index: 10;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.modal-body {
  padding: 32px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

.modal-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.modal-description {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.modal-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.modal-links {
  display: flex;
  gap: 16px;
}

/* ===========================
   Reveal Animations
   =========================== */
.reveal-up,
.reveal-left,
.reveal-right {
  opacity: 0;
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-up {
  transform: translateY(40px);
}

.reveal-left {
  transform: translateX(-40px);
}

.reveal-right {
  transform: translateX(40px);
}

.reveal-up.revealed,
.reveal-left.revealed,
.reveal-right.revealed {
  opacity: 1;
  transform: translate(0);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  
  .hero-content {
    order: 2;
  }
  
  .hero-visual {
    order: 1;
  }
  
  .hero-description {
    margin: 0 auto 32px;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-social {
    justify-content: center;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 80px 0;
  }
  
  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }
  
  .hero-image-wrapper {
    width: 260px;
    height: 260px;
  }
  
  .hero-stats {
    gap: 16px;
  }
  
  .stat-card {
    padding: 16px 24px;
  }
  
  .scroll-indicator {
    display: none;
  }
  
  .section-header {
    margin-bottom: 40px;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 32px;
    text-align: center;
  }
  
  .footer-brand {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px 24px;
  }
  
  .education-timeline {
    padding-left: 32px;
  }
  
  .education-timeline::before {
    left: 11px;
  }
  
  .education-item::before {
    left: -29px;
    width: 12px;
    height: 12px;
    border-width: 3px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .hero-stats {
    flex-direction: column;
    width: 100%;
  }
  
  .stat-card {
    width: 100%;
  }
  
  .skills-tabs,
  .projects-filter {
    gap: 6px;
  }
  
  .skill-tab,
  .filter-btn {
    padding: 8px 14px;
    font-size: 13px;
  }
  
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .contact-form {
    padding: 24px;
  }
}