/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
  --bg-primary: #FAF9F6;       /* Premium Warm Ivory / Alabaster */
  --bg-secondary: #F4F1EC;     /* Warm Clay / Sand */
  --bg-card: #FFFFFF;          /* Pure White for crisp separation */
  --text-primary: #1E1B18;     /* Rich Obsidian / Stone */
  --text-secondary: #5C5854;   /* Balanced Muted Charcoal */
  --accent-purple: #BC4B1F;    /* Premium Terracotta Orange */
  --accent-purple-hover: #A03E18;
  --accent-purple-light: rgba(188, 75, 31, 0.07);
  --accent-copper: #C27A3D;    /* Industrial Warm Copper */
  --accent-copper-light: #FAF5F0;
  
  --border-color: rgba(30, 27, 24, 0.08);
  --border-purple: rgba(113, 75, 103, 0.15);
  --shadow-subtle: 0 4px 20px rgba(30, 27, 24, 0.02);
  --shadow-medium: 0 12px 30px rgba(113, 75, 103, 0.04);
  --shadow-hover: 0 20px 40px rgba(113, 75, 103, 0.08);
  
  --bg-header: rgba(250, 249, 246, 0.85);

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;

  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
}

/* Dark Mode Overrides - Volcanic Basalt, Molten Amber & Blueprint Rose */
html.dark {
  --bg-primary: #0D0C0A;       /* Velvet Volcanic Onyx */
  --bg-secondary: #171512;     /* Warm Basalt Clay Gray */
  --bg-card: #201C19;          /* Charred Terracotta & Timber Card */
  --text-primary: #FAF6F0;     /* Cream Alabaster */
  --accent-purple: #E86A3C;    /* Vibrant Amber Orange for dark mode */
  --accent-purple-hover: #FFA27A;
  --accent-purple-light: rgba(232, 106, 60, 0.15);
  --accent-copper: #E99D4D;    /* Molten Architectural Amber / Gold */
  --accent-copper-light: #321D0E; /* Charred Amber Shadow */
  
  --border-color: rgba(233, 157, 77, 0.08); /* Amber Hairline Outline */
  --border-purple: rgba(220, 167, 200, 0.16);
  --shadow-subtle: 0 4px 24px rgba(0, 0, 0, 0.5);
  --shadow-medium: 0 16px 36px rgba(233, 157, 77, 0.02);
  --shadow-hover: 0 24px 48px rgba(233, 157, 77, 0.06);
  
  --bg-header: rgba(13, 12, 10, 0.82);
}

/* Custom Editorial Blueprint Detailing in Dark Mode */
html.dark .timeline-content,
html.dark .skill-category-card,
html.dark .contribution-card,
html.dark .edu-card {
  position: relative;
  overflow: visible;
  border-radius: 4px;
}

html.dark .timeline-content::before,
html.dark .skill-category-card::before,
html.dark .contribution-card::before,
html.dark .edu-card::before {
  content: '+';
  position: absolute;
  top: -8px;
  left: -4px;
  color: var(--accent-copper);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  opacity: 0.6;
}

html.dark .timeline-content::after,
html.dark .skill-category-card::after,
html.dark .contribution-card::after,
html.dark .edu-card::after {
  content: '+';
  position: absolute;
  bottom: -9px;
  right: -4px;
  color: var(--accent-copper);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  opacity: 0.6;
}

/* ==========================================================================
   RESET & FOUNDATIONS
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* Noise texture overlay */
.noise-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  content: "";
  opacity: 0.035;
  z-index: 9999;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3%3Ffilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Utilities */
.font-mono { font-family: var(--font-mono); }
.italic-serif { font-family: var(--font-serif); font-style: italic; font-weight: 400; }
.text-center { text-align: center; }
.max-w-2xl { max-width: 42rem; }
.max-w-lg { max-width: 32rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
}

/* ==========================================================================
   BUTTONS & INTERACTIVE ELEMENTS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.6rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-primary {
  background-color: var(--accent-purple);
  color: var(--bg-primary);
  border: 1px solid var(--accent-purple);
  box-shadow: 0 4px 12px rgba(113, 75, 103, 0.15);
}

.btn-primary:hover {
  background-color: var(--accent-purple-hover);
  border-color: var(--accent-purple-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(113, 75, 103, 0.25);
}

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

.btn-secondary:hover {
  background-color: var(--accent-purple-light);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background-color: var(--bg-secondary);
  border-color: var(--text-primary);
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition-smooth);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.logo-dot {
  width: 10px;
  height: 10px;
  background-color: var(--accent-purple);
  border-radius: 50%;
}

.logo-text {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--accent-purple);
  margin-left: 6px;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

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

.mobile-logo {
  display: inline;
}

.desktop-logo {
  display: none;
}

.desktop-nav {
  display: none; /* Mobile first */
  align-items: center;
  gap: 2rem;
}

.nav-link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-purple);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.nav-link:hover::after {
  width: 100%;
}
.nav-link:hover {
  color: var(--accent-purple);
}

.nav-btn {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

/* Header Actions Wrapper */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

/* Theme Toggle Button styling */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
  padding: 0;
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
  border-color: var(--text-primary);
}

.theme-toggle svg {
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

/* Toggle Sun/Moon display states */
html.dark .theme-toggle .sun-icon {
  display: block;
  transform: rotate(360deg);
}

html.dark .theme-toggle .moon-icon {
  display: none;
}

body .theme-toggle .sun-icon {
  display: none;
}

body .theme-toggle .moon-icon {
  display: block;
  transform: rotate(0deg);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 16px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1002;
}

.mobile-menu-toggle .bar {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition-smooth);
}

.mobile-menu-toggle.active .bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.active .bar:nth-child(2) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu Overlay Backdrop */
.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Mobile Menu Drawer */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
  max-height: 90vh;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 1001;
  padding: 5rem 2rem 3rem;
  transform: translateY(-100%);
  transition: var(--transition-smooth);
  opacity: 0;
  box-shadow: var(--shadow-medium);
}

.mobile-menu.active {
  transform: translateY(0);
  opacity: 1;
}

/* Close Button inside mobile menu drawer */
.mobile-menu-close {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
  padding: 0;
}

.mobile-menu-close:hover {
  background-color: var(--bg-secondary);
  transform: rotate(90deg);
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}

.mobile-nav-link {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--accent-purple);
}

.mobile-nav-btn {
  width: 100%;
  max-width: 280px;
  margin-top: 1rem;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  padding: 8rem 1.5rem 4rem;
  display: flex;
  align-items: center;
  min-height: 85vh;
  border-bottom: 1px solid var(--border-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.hero-grid > * {
  min-width: 0;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge.certified {
  background-color: var(--accent-purple-light);
  color: var(--accent-purple);
  border: 1px solid var(--border-purple);
}

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

.badge-dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent-purple);
  border-radius: 50%;
  display: inline-block;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.5; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.5; }
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.highlight-text {
  color: var(--accent-purple);
  font-style: italic;
  font-weight: 700;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 600px;
}

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

.btn-secondary {
  display: inline-block;
  background-color: transparent;
  color: var(--text-primary);
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid var(--text-primary);
  transition: var(--transition-smooth);
}

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

.social-icon-link {
  color: var(--text-secondary);
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
}

.social-icon-link:hover {
  color: var(--accent-purple);
  transform: scale(1.1) translateY(-2px);
}

/* Page Load Smooth Animations (Hero) */
.reveal-on-load {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeSlideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.reveal-on-load.delay-1 {
  animation-delay: 0.2s;
}

.reveal-on-load.delay-2 {
  animation-delay: 0.4s;
}

.reveal-on-load.delay-3 {
  animation-delay: 0.6s;
}

.reveal-on-load.delay-4 {
  animation-delay: 0.8s;
}

@keyframes fadeSlideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero Decorative Visual Card */
.hero-visual {
  position: relative;
  width: 100%;
}
@keyframes floatCard {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

.visual-card {
  background-color: var(--bg-card);
  width: 100%;
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
  position: relative;
  z-index: 2;
  animation: floatCard 6s ease-in-out infinite;
}

html.dark .visual-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
}

.card-header {
  background-color: var(--bg-secondary);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}

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

.card-dot.red { background-color: #EF4444; }
.card-dot.yellow { background-color: #F59E0B; }
.card-dot.green { background-color: #10B981; }

.card-title {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  margin-left: 0.5rem;
}

.card-body {
  padding: 1.5rem;
  overflow-x: auto;
  min-height: 300px;
  -webkit-overflow-scrolling: touch;
}

.card-body pre {
  margin: 0;
  white-space: pre;
}

.card-body code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-primary);
}
#typingCursor, #sandboxCursor {
  animation: blink 1s step-end infinite;
  color: var(--text-primary);
}

/* Code Highlighting classes (Light Theme High Contrast) */
.keyword { color: #BC4B1F; font-weight: 600; }
.class-name { color: #7B5282; font-weight: 500; }
.function-name { color: #4B6B94; }
.string { color: #528E8C; }
.decorator { color: #6D7F60; }
.number { color: #C0793E; }

/* Dark Mode Overrides for Code Highlights */
html.dark .card-body code {
  color: #FAF6F0;
}
html.dark #typingCursor, html.dark #sandboxCursor {
  color: #FAF6F0;
}
html.dark .keyword { color: #FFA27A; }
html.dark .class-name { color: #DCA7C8; }
html.dark .function-name { color: #84B1E7; }
html.dark .string { color: #72CAC8; }
html.dark .decorator { color: #9FD087; }
html.dark .number { color: #FFA85A; }

.card-footer {
  background-color: var(--bg-secondary);
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.visual-decoration-glow {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(188, 75, 31, 0.04) 0%, transparent 70%);
  z-index: 1;
  pointer-events: none;
}

/* Stats Bar */
.stats-bar {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 3rem auto;
  max-width: 1200px;
  width: 100%;
  box-shadow: var(--shadow-subtle);
}

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

.stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent-purple);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stats-bar .divider {
  display: none;
  background-color: var(--border-color);
}

/* Media Queries (Responsive Breakpoints for Hero & Stats) */
@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
  }

  .hero-title {
    font-size: 3.5rem;
  }

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

  .stats-bar .divider {
    display: block;
    width: 1px;
    height: 40px;
    background-color: var(--border-color);
  }
}

/* ==========================================================================
   INTERACTIVE ERP SANDBOX
   ========================================================================== */
.interactive-section {
  padding: 5rem 1.5rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.section-container {
  max-width: 1100px;
  margin: 0 auto;
}

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

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-copper);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-sans);
  font-size: 2.2rem;
  letter-spacing: -0.5px;
  margin-bottom: 1rem;
}

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

/* Sandbox UI Shell */
.erp-sandbox-wrapper {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.erp-controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.erp-btn {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1.25rem 3rem 1.25rem 1.25rem; /* Spacious right padding for the arrow */
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: var(--transition-smooth);
  position: relative;
}

.erp-btn::after {
  content: '→';
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%) translateX(0);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: bold;
  color: var(--text-secondary);
  opacity: 0.4;
  transition: var(--transition-smooth);
}

.erp-btn:hover {
  transform: translateX(4px);
  border-color: var(--accent-purple);
}

.erp-btn:hover::after {
  transform: translateY(-50%) translateX(4px);
  opacity: 0.8;
  color: var(--accent-purple);
}

.erp-btn.active {
  border-color: var(--accent-purple);
  box-shadow: var(--shadow-medium);
  background-color: var(--accent-purple-light);
}

.erp-btn.active::after {
  transform: translateY(-50%) translateX(4px);
  opacity: 1;
  color: var(--accent-purple);
}

html.dark .erp-btn:hover::after,
html.dark .erp-btn.active::after {
  color: var(--accent-copper);
}

.erp-btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 6px;
  background-color: var(--bg-secondary);
  color: var(--accent-purple);
  transition: var(--transition-fast);
}

.erp-btn.active .erp-btn-icon {
  background-color: var(--accent-purple);
  color: var(--bg-card);
}

.erp-btn-text {
  display: flex;
  flex-direction: column;
}

.erp-btn-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.erp-btn-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Mock Screen & Flow */
.erp-screen {
  background-color: var(--bg-card);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  min-height: auto;
}

.erp-screen .card-body {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

html.dark .erp-screen {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
}


/* ==========================================================================
   EXPERIENCE SECTION & TIMELINE
   ========================================================================== */
.experience-section {
  padding: 6rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.experience-timeline {
  position: relative;
  margin-top: 4rem;
  padding-left: 1.5rem;
}

.experience-timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background-color: var(--border-color);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.experience-timeline.visible::before {
  transform: scaleY(1);
}

.timeline-item {
  position: relative;
  margin-bottom: 3.5rem;
}

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

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-copper);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.timeline-location {
  color: var(--text-secondary);
  font-weight: 400;
}

.timeline-dot {
  position: absolute;
  left: -28px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 3px solid var(--accent-purple);
  transition: var(--transition-smooth);
}

.timeline-item:hover .timeline-dot {
  background-color: var(--accent-purple);
  box-shadow: 0 0 10px rgba(113, 75, 103, 0.4);
}

.timeline-content {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.75rem;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-smooth);
}

.timeline-content:hover {
  transform: translateY(-4px);
  border-color: var(--border-purple);
  box-shadow: var(--shadow-hover);
}

.experience-header {
  margin-bottom: 1.25rem;
}

.role-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 0.25rem;
}

.company-name {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--accent-purple);
}

.experience-summary {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  font-style: italic;
}

.experience-highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.experience-highlights li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.experience-highlights li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-copper);
  font-weight: bold;
}

.highlight-keyword {
  color: var(--text-primary);
  font-weight: 600;
}

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

.tag {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

.tag:hover {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  background-color: var(--accent-purple-light);
}

/* ==========================================================================
   OPEN SOURCE / OCA SECTION
   ========================================================================== */
.contributions-section {
  padding: 6rem 1.5rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.contributions-grid-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  max-width: 1100px;
  margin: 0 auto;
}

.contributions-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.oca-badge-box {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.oca-badge {
  background-color: var(--bg-card);
  border: 1px solid var(--border-purple);
  color: var(--accent-purple);
  padding: 0.4rem 0.8rem;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
}

.contributions-cards {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contribution-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
  border-radius: 6px;
  box-shadow: var(--shadow-subtle);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

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

.contrib-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.github-icon {
  color: var(--accent-purple);
}

.contrib-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

/* ==========================================================================
   TECHNICAL SKILLS MATRIX
   ========================================================================== */
.skills-section {
  padding: 6rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 3.5rem;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.skill-category-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 2rem;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-smooth);
}

.skill-category-card:hover {
  border-color: var(--border-purple);
  box-shadow: var(--shadow-hover);
}

.skill-cat-title {
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.cat-icon {
  font-size: 1.25rem;
}

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

.skill-list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.skill-list li::before {
  content: '▪';
  position: absolute;
  left: 0;
  color: var(--accent-copper);
  font-size: 1rem;
  top: -1px;
}

/* ==========================================================================
   EDUCATION & CERTIFICATIONS
   ========================================================================== */
.education-section {
  padding: 6rem 1.5rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.edu-cert-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
  max-width: 1100px;
  margin: 0 auto;
}

.column-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.column-icon {
  font-size: 1.5rem;
}

.column-title {
  font-size: 1.6rem;
  letter-spacing: -0.5px;
}

.edu-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2rem;
  border-radius: 6px;
  box-shadow: var(--shadow-subtle);
}

.edu-date {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-copper);
  display: block;
  margin-bottom: 0.75rem;
}

.edu-degree {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.35;
}

.edu-institution {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  color: var(--accent-purple);
  margin-bottom: 0.25rem;
}

.edu-location {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-smooth);
}

.cert-item:hover {
  border-color: var(--border-purple);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.cert-badge-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--accent-purple-light);
  border: 2px solid var(--accent-purple);
  color: var(--accent-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: bold;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.cert-issuer {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.cert-name {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-section {
  padding: 6rem 1.5rem;
  background-color: var(--bg-primary);
}

.contact-card-box {
  max-width: 800px;
  margin: 0 auto;
}

.contact-inner {
  background-color: var(--bg-card);
  border: 1px solid var(--border-purple);
  border-radius: 8px;
  padding: 2.5rem 1.5rem;
  box-shadow: var(--shadow-medium);
  text-align: center;
}

.contact-title {
  font-size: 1.8rem;
  letter-spacing: -0.5px;
  margin-top: 1rem;
  margin-bottom: 1rem;
}

.contact-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.5;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2.5rem;
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition-fast);
}

.contact-item:hover {
  color: var(--accent-purple);
}

.contact-icon-wrapper {
  color: var(--accent-purple);
  display: flex;
  align-items: center;
  justify-content: center;
}

.social-links-footer {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.social-btn {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.social-btn:hover {
  color: var(--accent-purple);
}

.social-btn .arrow-up {
  font-size: 0.7rem;
  transition: var(--transition-fast);
}

.social-btn:hover .arrow-up {
  transform: translate(2px, -2px);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.main-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 1.5rem;
  text-align: center;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-details {
  opacity: 0.7;
}

/* ==========================================================================
   MEDIA QUERIES (RESPONSIVE GRID)
   ========================================================================== */
@media (max-width: 767px) {
  /* Mobile WCAG 44px Tap Target Compliance */
  .theme-toggle {
    width: 44px !important;
    height: 44px !important;
  }
  
  .mobile-menu-toggle {
    width: 44px !important;
    height: 44px !important;
    padding: 14px 10px !important; /* Visual burger remains 24x16, tap area expands to 44px */
  }
  
  .mobile-menu-close {
    width: 44px !important;
    height: 44px !important;
    top: 1rem !important;
    right: 1rem !important;
  }

  /* Optimized Mobile Card Paddings & Spacing */
  .timeline-content,
  .contribution-card,
  .edu-card {
    padding: 1.25rem !important;
  }
  
  .timeline-date {
    margin-bottom: 1.25rem !important;
  }

  /* Mobile ERP control vertical stack (inspired by Monaspace) */
  .erp-controls {
    flex-direction: column !important;
    gap: 0.75rem;
  }
  
  .erp-btn {
    width: 100% !important;
    padding: 1rem 1.25rem !important;
    gap: 1rem !important;
  }
  
  .erp-btn-desc {
    display: block !important; /* Show description on mobile */
    font-size: 0.75rem !important;
    margin-top: 0.15rem;
  }
  
  .erp-btn-title {
    font-size: 0.9rem !important;
  }
  
  .erp-btn-icon {
    width: 38px !important;
    height: 38px !important;
  }
  
  .interactive-section {
    padding: 3rem 0.75rem !important; /* Reduce section lateral padding to expand the terminal block */
  }
  
  /* Section padding improvements */
  .hero-section {
    padding-top: 5.5rem;
    padding-bottom: 2.5rem;
    min-height: auto;
  }
  
  .hero-title {
    font-size: 1.85rem;
    line-height: 1.2;
    overflow-wrap: break-word;
  }
  
  .hero-subtitle {
    font-size: 0.95rem;
    line-height: 1.5;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .contact-inner {
    padding: 2rem 1.25rem;
  }
}

@media (min-width: 576px) {
  .hero-cta-group {
    flex-direction: row;
  }
}

@media (min-width: 768px) {
  /* Header navigation */
  .desktop-nav {
    display: flex;
  }
  .mobile-logo {
    display: none;
  }
  .desktop-logo {
    display: inline;
  }
  .mobile-menu-toggle {
    display: none;
  }
  
  /* Hero typography */
  .hero-title {
    font-size: 4rem;
  }
  .hero-subtitle {
    font-size: 1.25rem;
  }

  /* Experience layout */
  .experience-timeline {
    padding-left: 0;
  }
  .experience-timeline::before {
    left: 200px;
  }
  .timeline-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 3rem;
  }
  .timeline-date {
    text-align: right;
    align-items: flex-end;
    margin-bottom: 0;
    padding-right: 1.5rem;
  }
  .timeline-dot {
    left: 194px;
    top: 6px;
  }

  /* Interactive sandbox */
  .erp-sandbox-wrapper {
    flex-direction: row;
    align-items: stretch;
  }
  .erp-controls {
    width: 320px;
    flex-shrink: 0;
  }
  .erp-screen {
    flex-grow: 1;
  }

  /* Split layout for education / certifications */
  .edu-cert-split {
    grid-template-columns: 1fr 1fr;
  }

  /* Skills grid */
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contributions grid layout */
  .contributions-grid-layout {
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
  }

  .contact-inner {
    padding: 4rem;
  }
  .contact-title {
    font-size: 2.2rem;
  }
}

@media (min-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ==========================================================================
   PREMIUM ADDONS & UTILITIES
   ========================================================================== */

/* Scroll Progress Indicator Bar */
.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background-color: var(--accent-purple);
  width: 0%;
  z-index: 1003;
  transition: width 0.1s ease-out;
}

html.dark .scroll-progress {
  background-color: var(--accent-copper);
}

/* Skills Search Bar Filter */
.skills-filter-wrapper {
  margin-bottom: 2.5rem;
  padding: 0 1.5rem;
}

.skills-search-input {
  width: 100%;
  max-width: 500px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.9rem 1.25rem;
  border-radius: 4px;
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition-smooth);
}

.skills-search-input:focus {
  border-color: var(--accent-purple);
  box-shadow: 0 0 15px rgba(113, 75, 103, 0.1);
}

html.dark .skills-search-input:focus {
  border-color: var(--accent-copper);
  box-shadow: 0 0 15px rgba(233, 157, 77, 0.1);
}

/* Dimming/filtering state for skills */
.skill-list li {
  transition: opacity 0.3s ease, transform 0.3s ease, color 0.3s ease;
}

.skill-list li.dimmed {
  opacity: 0.25;
  transform: scale(0.95);
}

.skill-list li.highlighted {
  color: var(--accent-purple) !important;
  font-weight: 600;
}

html.dark .skill-list li.highlighted {
  color: var(--accent-copper) !important;
}

/* Floating Back-to-Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px) scale(0.9);
  transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s ease;
  box-shadow: var(--shadow-subtle);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  background-color: var(--bg-secondary);
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  transform: translateY(-3px);
}

html.dark .back-to-top:hover {
  border-color: var(--accent-copper);
  color: var(--accent-copper);
  box-shadow: 0 0 15px rgba(233, 157, 77, 0.2);
}

/* Elite Accessibility Support: Respect system preference for reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }
  
  *,
  *::before,
  *::after {
    animation-delay: -1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    background-attachment: initial !important;
    scroll-behavior: auto !important;
    transition-duration: 0s !important;
    transition-delay: 0s !important;
  }
}