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

/* CSS Variables for Premium Theme */
:root {
  --font-primary: 'Plus Jakarta Sans', sans-serif;
  --font-display: 'Outfit', sans-serif;

  /* Color Palette - Elegant Light Mode */
  --bg-primary: #F0F2F5;
  /* HSL 220, 20%, 95% - Background color */
  --bg-secondary: #FFFFFF;
  /* Pure White for card panels & sections */
  --bg-tertiary: #E2E7EE;
  /* HSL 220, 15%, 90% - For inputs and tracks */

  --color-primary: #3366CC;
  /* HSL 220, 60%, 50% - Primary blue */
  --color-primary-light: #5C8AE6;
  /* Lighter primary */
  --color-primary-glow: rgba(51, 102, 204, 0.08);

  --color-secondary: #33A6B8;
  /* HSL 190, 70%, 40% - Accent color */
  --color-secondary-light: #3CBED2;

  --text-primary: #1A202C;
  /* Dark slate primary text */
  --text-secondary: #4A5568;
  /* Muted slate text */
  --text-muted: #718096;
  /* Light slate text */

  --border-color: rgba(51, 102, 204, 0.1);
  --border-color-hover: rgba(51, 102, 204, 0.25);

  /* Layout & Animations */
  --max-width: 1100px;
  --header-height: 80px;
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;

  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
}

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

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Custom Selection & Scrollbar */
::selection {
  background-color: var(--color-primary-glow);
  color: var(--color-primary-light);
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
  border: 2px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

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

p {
  color: var(--text-secondary);
  font-size: 1rem;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Section Header */
.section {
  padding: 8rem 0;
  position: relative;
}

.section-header {
  margin-bottom: 4rem;
  max-width: 600px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
}

.section-subtitle {
  margin-top: 1rem;
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

header.scrolled {
  height: 70px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 4px 20px rgba(51, 102, 204, 0.04);
}

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

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary) 30%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.logo::after {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  background-color: var(--color-secondary);
  border-radius: 50%;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 0.5rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: var(--transition-smooth);
}

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

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

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.mobile-nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-smooth);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--header-height);
  overflow: hidden;
  background-color: var(--bg-primary);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
  width: 100%;
}

.hero-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-right {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-intro {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 2rem;
}

.hero-pulse {
  width: 8px;
  height: 8px;
  background-color: var(--color-secondary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

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

.hero-description {
  font-size: clamp(1.05rem, 1.8vw, 1.15rem);
  color: var(--text-secondary);
  margin-bottom: 3rem;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
}

/* Interactive Data Pipeline Flow */
.pipeline-container {
  width: 100%;
  max-width: 440px;
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--border-radius-lg);
  padding: 2.2rem 2rem;
  box-shadow: 
    0 15px 35px rgba(51, 102, 204, 0.03),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

.pipeline-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.pipeline-flow {
  display: flex;
  flex-direction: column;
  gap: 2.2rem;
  position: relative;
  z-index: 2;
}

.pipeline-node {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  position: relative;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(51, 102, 204, 0.08);
  border-left: 4px solid var(--node-color);
  border-radius: var(--border-radius-md);
  padding: 0.9rem 1.25rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.015);
}

.pipeline-node:hover {
  transform: translateY(-4px);
  box-shadow: 
    0 12px 24px var(--node-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  border-color: var(--node-color);
  background: #FFFFFF;
}

/* Stagger even nodes slightly right, recalculates connect paths automatically */
.pipeline-node:nth-child(even) {
  transform: translateX(18px);
}

.pipeline-node:nth-child(even):hover {
  transform: translateX(18px) translateY(-4px);
}

.node-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 2px solid var(--node-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--node-color);
  z-index: 3;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-sizing: border-box;
  position: relative;
  flex-shrink: 0;
}

/* Subtle pulsating animation for node icons */
.node-icon::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 1px solid var(--node-color);
  animation: nodePing 2s cubic-bezier(0.16, 1, 0.3, 1) infinite;
  opacity: 0;
}

@keyframes nodePing {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.4); opacity: 0; }
}

.pipeline-node:hover .node-icon {
  background-color: var(--node-color);
  color: #FFFFFF;
  transform: scale(1.08);
  box-shadow: 0 0 15px var(--node-color);
}

.node-content {
  display: flex;
  flex-direction: column;
}

.node-tag {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--node-color);
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.node-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin: 0.1rem 0;
}

.node-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.2;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 2rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border: 1px solid var(--color-primary);
  box-shadow: 0 4px 14px rgba(51, 102, 204, 0.2);
}

.btn-primary:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(51, 102, 204, 0.3);
}

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

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

/* About / Stats Grid */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.about-text strong {
  color: var(--text-primary);
}

.stats-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: var(--border-radius-md);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  box-shadow: 0 10px 30px rgba(51, 102, 204, 0.04);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Timeline/Experience Section */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20px;
  width: 2px;
  height: 100%;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 4rem;
}

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

.timeline-dot {
  position: absolute;
  left: 11px;
  top: 5px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 3px solid var(--color-primary);
  z-index: 2;
  transition: var(--transition-smooth);
}

.timeline-item:hover .timeline-dot {
  background-color: var(--color-primary);
  box-shadow: 0 0 15px rgba(51, 102, 204, 0.4);
  transform: scale(1.2);
}

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

.timeline-title h3 {
  font-size: 1.35rem;
  font-weight: 700;
}

.timeline-company {
  font-size: 1.05rem;
  color: var(--color-secondary);
  font-weight: 600;
  margin-top: 0.25rem;
}

.timeline-date {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 600;
  background: var(--bg-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  border: 1px solid var(--border-color);
}

.timeline-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 2rem;
  border-radius: var(--border-radius-md);
  box-shadow: 0 4px 20px rgba(51, 102, 204, 0.03);
  transition: var(--transition-smooth);
}

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

.timeline-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.timeline-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.timeline-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

/* Skills Section */
.skills-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  overflow-x: auto;
}

.skills-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
  white-space: nowrap;
}

.skills-tab-btn.active {
  color: var(--color-primary);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: var(--border-radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: var(--transition-smooth);
}

.skill-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(51, 102, 204, 0.05);
}

.skill-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.skill-level {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-bar {
  flex-grow: 1;
  height: 6px;
  background-color: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: 3px;
  width: 0;
  /* Animated via JS */
  transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 20px rgba(51, 102, 204, 0.03);
}

.project-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(51, 102, 204, 0.08);
}

.project-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.project-icon {
  width: 48px;
  height: 48px;
  background-color: var(--bg-primary);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  border: 1px solid var(--border-color);
  font-size: 1.25rem;
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-link {
  color: var(--text-secondary);
  font-size: 1.2rem;
}

.project-link:hover {
  color: var(--color-secondary);
}

.project-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.project-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  flex-grow: 1;
}

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

.project-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-primary-glow);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
}

/* Certifications Section */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.cert-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
  border-radius: var(--border-radius-md);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.cert-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(51, 102, 204, 0.04);
}

.cert-issuer {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.cert-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.cert-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 1rem;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
}

.cert-id {
  font-family: monospace;
}

/* Contact Section */
.contact-section-center {
  text-align: center;
}

.contact-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 4rem;
  width: 100%;
}

.contact-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 2.5rem 2rem;
  border-radius: var(--border-radius-md);
  box-shadow: 0 4px 20px rgba(51, 102, 204, 0.03);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
  transition: var(--transition-smooth);
}

.contact-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(51, 102, 204, 0.06);
}

.contact-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 1.35rem;
  flex-shrink: 0;
  transition: var(--transition-smooth);
}

.contact-card:hover .contact-icon {
  background-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 0 12px rgba(51, 102, 204, 0.25);
}

.contact-details h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.contact-details p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.contact-details a {
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

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


/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 4rem 0;
  background-color: var(--bg-secondary);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

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

.footer-socials {
  display: flex;
  gap: 1.5rem;
}

.footer-social-link {
  color: var(--text-secondary);
  font-size: 1.2rem;
  transition: var(--transition-fast);
}

.footer-social-link:hover {
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* Scroll-Reveal Animation Utility */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Keyframes */
@keyframes pulse {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(51, 166, 184, 0.4);
  }

  70% {
    transform: scale(1);
    box-shadow: 0 0 0 6px rgba(51, 166, 184, 0);
  }

  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(51, 166, 184, 0);
  }
}

/* AI & Spatial Playground Sandbox Styles */
.playground-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.playground-tab-btn {
  background: transparent;
  border: none;
  font-family: var(--font-primary);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem 1.25rem;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
}

.playground-tab-btn.active {
  color: var(--color-primary);
  background-color: var(--color-primary-glow);
  box-shadow: inset 0 0 0 1px rgba(51, 102, 204, 0.15);
}

.playground-pane {
  display: none;
}

.playground-pane.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.sandbox-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.sandbox-controls {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: 0 4px 20px rgba(51, 102, 204, 0.02);
}

.sandbox-controls h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

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

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.sandbox-select {
  padding: 0.75rem 1rem;
  font-family: var(--font-primary);
  font-size: 0.95rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.sandbox-select:hover, .sandbox-select:focus {
  border-color: var(--color-primary-light);
}

.sandbox-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  outline: none;
}

.sandbox-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.sandbox-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.console-box {
  background-color: #111827;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 0.5rem;
}

.console-header {
  background-color: #1F2937;
  padding: 0.5rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: monospace;
  font-size: 0.75rem;
  color: #9CA3AF;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.console-dot {
  width: 8px;
  height: 8px;
  background-color: #10B981;
  border-radius: 50%;
  animation: blink 1.5s infinite;
}

.console-output {
  padding: 1rem;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.8rem;
  color: #34D399;
  height: 120px;
  overflow-y: auto;
  line-height: 1.5;
  white-space: pre-wrap;
}

.sandbox-visualization {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 2.2rem;
  box-shadow: 0 10px 30px rgba(51, 102, 204, 0.03);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.vis-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.vis-header h3 {
  font-size: 1.25rem;
}

.status-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  letter-spacing: 0.05em;
}

.status-tag.idle {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.status-tag.running {
  background-color: var(--color-primary-glow);
  color: var(--color-primary);
  animation: pulseTag 1.5s infinite;
}

.status-tag.success {
  background-color: rgba(16, 185, 129, 0.08);
  color: #10B981;
}

@keyframes pulseTag {
  0% { opacity: 0.6; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

.vis-area {
  position: relative;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  background-color: #0B0F19;
  height: 440px;
  border: 1px solid rgba(51, 102, 204, 0.15);
}

.sandbox-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.output-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(11, 15, 25, 0.95);
  z-index: 10;
}

.output-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* Spatial specific styles */
.vis-legend {
  display: flex;
  gap: 1rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.legend-dot.road-dot {
  background-color: rgba(51, 102, 204, 0.5);
  box-shadow: 0 0 5px rgba(51, 102, 204, 0.5);
}

.legend-dot.charger-dot {
  background-color: #EAB308;
  box-shadow: 0 0 8px #EAB308;
}

.spatial-map-area {
  cursor: crosshair;
}

.map-helper-text {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #9CA3AF;
  padding: 0.5rem 1rem;
  border-radius: 100px;
  font-size: 0.8rem;
  pointer-events: none;
  z-index: 5;
}

.stats-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  width: 100%;
}

.panel-stat {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 1rem 0.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.panel-stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.panel-stat-val {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
}

.active-toggle.active {
  background-color: var(--color-secondary);
  color: white;
  border-color: var(--color-secondary);
  box-shadow: 0 4px 10px rgba(51, 166, 184, 0.2);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* Responsive Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3.5rem;
    text-align: center;
  }

  .hero-left {
    align-items: center;
  }

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

  .hero-intro {
    margin-left: auto;
    margin-right: auto;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .stats-card {
    flex-direction: row;
    justify-content: space-around;
  }

  .sandbox-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .vis-area {
    height: 380px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 6rem 0;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-secondary);
    flex-direction: column;
    align-items: center;
    padding: 4rem 2rem;
    transition: var(--transition-smooth);
    z-index: 999;
    border-top: 1px solid var(--border-color);
    overflow-y: auto;
  }

  .nav-links.active {
    left: 0;
  }

  header.scrolled .nav-links {
    top: 70px;
    height: calc(100vh - 70px);
  }

  .mobile-nav-toggle {
    display: flex;
  }

  /* Hamburger menu animation when active */
  .mobile-nav-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .mobile-nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-nav-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .stats-card {
    flex-direction: column;
    gap: 1.5rem;
  }

  .timeline::before {
    left: 15px;
  }

  .timeline-dot {
    left: 6px;
  }

  .timeline-item {
    padding-left: 40px;
  }

  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .timeline-date {
    margin-top: 0.5rem;
  }

  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }

  .contact-cards-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1.25rem;
  }

  .section {
    padding: 4rem 0;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .pipeline-container {
    padding: 1.5rem 1.25rem;
  }

  .pipeline-node:nth-child(even) {
    transform: translateX(8px);
  }

  .pipeline-node:nth-child(even):hover {
    transform: translateX(8px) translateY(-4px);
  }

  .project-card {
    padding: 1.75rem 1.25rem;
  }

  .stats-card {
    padding: 1.75rem 1.25rem;
  }

  .timeline-content {
    padding: 1.5rem 1.25rem;
  }

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

  .contact-card {
    padding: 1.75rem 1.25rem;
  }

  .vis-area {
    height: 320px;
  }

  .playground-tabs {
    gap: 0.5rem;
    overflow-x: auto;
  }

  .playground-tab-btn {
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
  }

  .sandbox-controls {
    padding: 1.25rem;
  }

  .stats-panel {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}