/* ==========================================================================
   JOEL SINGH - ROBOTICS & AUTOMATION ENGINEERING PORTFOLIO
   Design System & Styling Rules
   Built with CSS3 Variables, Glassmorphism, Responsive Grid, and Dark Tech Aesthetic
   ========================================================================== */

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

/* --- CSS Variables & Design System --- */
:root {
  /* Colors */
  --bg-dark: #0B0F19;
  --bg-darker: #060911;
  --surface-card: #111827;
  --surface-card-hover: #1F2937;
  --surface-glass: rgba(17, 24, 39, 0.75);
  
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-glow: rgba(37, 99, 235, 0.35);
  
  --cyan: #06B6D4;
  --cyan-glow: rgba(6, 182, 212, 0.3);
  
  --accent-amber: #F59E0B;
  --accent-emerald: #10B981;
  --accent-purple: #8B5CF6;
  
  --text-main: #F9FAFB;
  --text-muted: #9CA3AF;
  --text-dim: #6B7280;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(37, 99, 235, 0.4);
  --border-cyan: rgba(6, 182, 212, 0.4);

  /* Typography */
  --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;

  /* Layout & Spacing */
  --container-max: 1240px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  /* Animation & Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

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

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

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darker);
}
::-webkit-scrollbar-thumb {
  background: #1F2937;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* --- Container & Section Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 6rem 0;
  position: relative;
}

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

.section-subtitle {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-full);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.section-title span {
  background: linear-gradient(135deg, var(--text-main) 30%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  max-width: 650px;
  margin: 0.75rem auto 0;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* --- Navigation Bar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.2rem 0;
  transition: var(--transition-normal);
  background: transparent;
}

.navbar.scrolled {
  padding: 0.8rem 0;
  background: var(--surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: 1px;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-size: 1rem;
  box-shadow: 0 0 15px var(--primary-glow);
}

.nav-logo span {
  color: var(--cyan);
}

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

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

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

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

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

.nav-cta {
  padding: 0.5rem 1.2rem;
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid var(--primary);
  color: var(--text-main);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: var(--transition-normal);
}

.nav-cta:hover {
  background: var(--primary);
  box-shadow: 0 0 20px var(--primary-glow);
  transform: translateY(-2px);
}

/* Hamburger Menu Toggle */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 24px;
  flex-direction: column;
  justify-content: space-between;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: var(--transition-normal);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(11px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-11px) rotate(-45deg);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  padding-top: 8rem;
  display: flex;
  align-items: center;
  position: relative;
  background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.12) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #60A5FA;
  margin-bottom: 1.5rem;
}

.hero-badge-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 10px rgba(6, 182, 212, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(6, 182, 212, 0); }
}

.hero-name {
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.8rem;
  letter-spacing: -1px;
}

.hero-title {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: 1.5rem;
  min-height: 2.4rem;
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 1.8rem;
  border-left: 3px solid var(--primary);
  padding-left: 1rem;
  font-style: italic;
}

.hero-interests {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.2rem;
}

.interest-tag {
  padding: 0.35rem 0.85rem;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-main);
  font-weight: 500;
  transition: var(--transition-fast);
}

.interest-tag:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #1D4ED8);
  color: #FFF;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.5);
}

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

.btn-secondary:hover {
  background: var(--surface-card-hover);
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-3px);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-glow);
}

.btn-outline:hover {
  background: rgba(37, 99, 235, 0.1);
  border-color: var(--primary);
  transform: translateY(-3px);
}

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

.social-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 1.1rem;
  transition: var(--transition-normal);
}

.social-icon:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(6, 182, 212, 0.1);
  transform: translateY(-3px);
}

/* Hero Canvas & Visual Column */
.hero-visual {
  position: relative;
  width: 100%;
  height: 460px;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

#heroCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-overlay-hud {
  position: absolute;
  top: 1rem;
  left: 1rem;
  right: 1rem;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.hud-tag {
  background: rgba(11, 15, 25, 0.8);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

/* --- About Me Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.about-content p {
  color: var(--text-muted);
  margin-bottom: 1.2rem;
  font-size: 1.05rem;
}

.about-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.about-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
}

.about-pill i {
  color: var(--cyan);
}

/* Stats Section Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.stat-card {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: var(--transition-normal);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--cyan));
}

.stat-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.stat-num {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* --- Skills Section --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.skill-category-card {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition-normal);
}

.skill-category-card:hover {
  border-color: var(--border-glow);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  transform: translateY(-4px);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.category-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid var(--border-glow);
  color: var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.category-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-main);
  font-weight: 500;
  transition: var(--transition-fast);
}

.skill-item:hover {
  background: rgba(6, 182, 212, 0.1);
  border-color: var(--cyan);
  color: var(--cyan);
}

.skill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--cyan);
}

/* --- Projects Section --- */
.filter-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.filter-btn {
  padding: 0.6rem 1.4rem;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-normal);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--primary);
  color: #FFF;
  border-color: var(--primary);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 2.2rem;
}

.project-card {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.project-img-wrap {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: var(--bg-darker);
}

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

.project-card:hover .project-img {
  transform: scale(1.06);
}

.project-badge-tag {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.3rem 0.8rem;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan);
  font-weight: 600;
}

.project-body {
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.2rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: var(--radius-sm);
  color: #93C5FD;
}

.project-highlights-box {
  background: rgba(255, 255, 255, 0.02);
  border-left: 3px solid var(--cyan);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem;
}

.project-highlights-box strong {
  color: var(--text-main);
}

.project-footer {
  margin-top: auto;
  display: flex;
  gap: 0.8rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.project-footer .btn {
  padding: 0.6rem 1rem;
  font-size: 0.85rem;
  flex: 1;
}

/* --- System Architecture Custom CSS Diagrams --- */
.arch-diagram-card {
  background: var(--bg-darker);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.water-tank-diagram {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.tank-visual {
  width: 140px;
  height: 180px;
  border: 3px solid #4B5563;
  border-top: none;
  border-radius: 0 0 12px 12px;
  position: relative;
  background: rgba(255,255,255,0.02);
  overflow: hidden;
}

.tank-water {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 60%;
  background: linear-gradient(180deg, rgba(6, 182, 212, 0.6), rgba(37, 99, 235, 0.8));
  transition: height 1s ease;
}

.tank-level-line {
  position: absolute;
  width: 100%;
  border-bottom: 1.5px dashed;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  padding-right: 4px;
  text-align: right;
}

.level-85 { bottom: 85%; border-color: var(--accent-emerald); color: var(--accent-emerald); }
.level-30 { bottom: 30%; border-color: var(--accent-amber); color: var(--accent-amber); }

.motor-status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.status-dot.active { background-color: var(--accent-emerald); box-shadow: 0 0 10px var(--accent-emerald); }

.workflow-pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin: 1.5rem 0;
}

.pipeline-step {
  padding: 0.5rem 0.85rem;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
}

.pipeline-arrow {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* --- Project Case Study Modal --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(6, 9, 17, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-container {
  background: var(--surface-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  transform: scale(0.92);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.active .modal-container {
  transform: scale(1);
}

.modal-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background: var(--surface-card);
  z-index: 10;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
}

.modal-close-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  transition: var(--transition-fast);
}

.modal-close-btn:hover {
  background: rgba(239, 68, 68, 0.2);
  color: #EF4444;
  border-color: #EF4444;
}

.modal-body {
  padding: 2rem;
  font-size: 0.98rem;
  color: var(--text-muted);
}

.case-study-section {
  margin-bottom: 2rem;
}

.case-study-section h4 {
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.4rem;
}

.case-study-section h4 i {
  color: var(--cyan);
}

.case-study-list {
  list-style: none;
  padding-left: 0.5rem;
}

.case-study-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
}

.case-study-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--cyan);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.metric-box {
  background: var(--bg-darker);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: var(--radius-md);
  text-align: center;
}

.metric-val {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cyan);
}

.metric-lbl {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* --- Experience Section --- */
.timeline {
  position: relative;
  max-width: 850px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary), var(--cyan), transparent);
}

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

.timeline-dot {
  position: absolute;
  left: 19px;
  top: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 3px solid var(--cyan);
  box-shadow: 0 0 15px var(--cyan);
}

.timeline-card {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition-normal);
}

.timeline-card:hover {
  border-color: var(--border-glow);
  transform: translateX(5px);
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.role-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.company-name {
  color: var(--cyan);
  font-weight: 600;
}

.duration-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.3rem 0.75rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-muted);
}

/* --- Certifications Gallery --- */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.cert-card {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.cert-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.35);
}

.cert-preview-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--bg-darker);
  border-bottom: 1px solid var(--border-color);
}

.cert-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.cert-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.cert-issuer {
  color: var(--cyan);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.cert-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.cert-footer {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* --- Achievements Section --- */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.achievement-card {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: var(--transition-normal);
}

.achievement-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-amber);
  box-shadow: 0 15px 30px rgba(245, 158, 11, 0.15);
}

.achievement-badge-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--accent-amber);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.achievement-rank {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.3rem;
}

.achievement-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.achievement-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* --- Education Section --- */
.education-card {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2.5rem;
  align-items: center;
}

.edu-left {
  text-align: center;
  border-right: 1fr solid var(--border-color);
  padding-right: 2rem;
}

.edu-cgpa-box {
  display: inline-block;
  padding: 1rem 1.5rem;
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

.edu-cgpa-val {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--cyan);
}

.edu-cgpa-lbl {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Resume Section --- */
.resume-banner {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15), rgba(6, 182, 212, 0.15));
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.resume-banner h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.resume-banner p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 3.5rem;
}

.contact-info-card {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.2rem 1.5rem;
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 1.2rem;
  transition: var(--transition-normal);
}

.contact-info-card:hover {
  border-color: var(--cyan);
  transform: translateX(5px);
}

.contact-info-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background: rgba(6, 182, 212, 0.1);
  color: var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.contact-form-wrap {
  background: var(--surface-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.85rem 1.1rem;
  background: var(--bg-darker);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 15px var(--primary-glow);
}

.form-input.invalid, .form-textarea.invalid {
  border-color: #EF4444;
}

.form-textarea {
  resize: vertical;
  min-height: 130px;
}

/* Toast Feedback */
.toast-notification {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  background: var(--surface-card);
  border: 1px solid var(--accent-emerald);
  border-radius: var(--radius-md);
  color: var(--text-main);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 0.8rem;
  z-index: 3000;
  transform: translateY(100px);
  opacity: 0;
  transition: var(--transition-normal);
}

.toast-notification.active {
  transform: translateY(0);
  opacity: 1;
}

/* Back To Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #FFF;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 5px 20px var(--primary-glow);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  background: var(--primary-hover);
}

/* --- Footer --- */
.footer {
  background: var(--bg-darker);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 2rem;
  text-align: center;
  color: var(--text-muted);
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.footer-quote {
  font-style: italic;
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

/* --- Responsive Media Queries --- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    height: 380px;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .education-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .edu-left {
    border-right: none;
    padding-right: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--surface-card);
    flex-direction: column;
    justify-content: center;
    gap: 1.8rem;
    padding: 2rem;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.7);
    transition: right 0.3s ease;
    z-index: 1000;
  }
  .nav-menu.active {
    right: 0;
  }
  .hero-name {
    font-size: 2.8rem;
  }
  .hero-title {
    font-size: 1.4rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  .timeline::before {
    left: 15px;
  }
  .timeline-item {
    padding-left: 45px;
  }
  .timeline-dot {
    left: 4px;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .certs-grid {
    grid-template-columns: 1fr;
  }
}