/* ==========================================================================
   PREMIUM DESIGN SYSTEM VARIABLES
   ========================================================================== */
:root {
  /* Refined Slate & Cyan Palette */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;
  
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-tertiary: #64748B;
  
  --accent-color: #0E7490;
  --accent-hover: #0891B2;
  --accent-light: rgba(14, 116, 144, 0.08);
  
  --border-light: #E2E8F0;
  --border-medium: #CBD5E1;
  --border-strong: #94A3B8;
  
  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --font-serif: 'Georgia', 'Times New Roman', serif;
  
  /* Spacing System */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-section: 4.5rem; /* NORMALIZED GAP: Changed from 7rem */
  
  /* Layout & UI */
  --max-width: 1200px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  /* Refined Shadows & Transitions */
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.02);
  --shadow-md: 0 10px 15px -3px rgba(15, 23, 42, 0.06), 0 4px 6px -4px rgba(15, 23, 42, 0.03);
  --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-family: var(--font-main); color: var(--text-primary); line-height: 1.6; font-size: 16px; }
body { background-color: var(--bg-primary); overflow-x: hidden; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
ul { list-style: none; }
img { max-width: 100%; display: block; border-radius: var(--radius-md); }

/* Scroll Progress Indicator */
.scroll-progress { position: fixed; top: 0; left: 0; width: 0%; height: 3px; background-color: var(--accent-color); z-index: 2000; transition: width 0.1s ease-out; }

/* Subtle Technical Backgrounds */
.bg-grid-pattern { position: absolute; inset: 0; background-image: radial-gradient(var(--border-medium) 1px, transparent 1px); background-size: 32px 32px; opacity: 0.25; z-index: -1; pointer-events: none; }

/* Containers */
.container { max-width: var(--max-width); margin: 0 auto; padding-left: var(--space-lg); padding-right: var(--space-lg); position: relative; }
section { padding-top: var(--space-section); padding-bottom: var(--space-section); position: relative; }
section:not(:last-child)::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 100%; max-width: var(--max-width); height: 1px; background: linear-gradient(90deg, transparent, var(--border-light), transparent); }

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */
.section-header { margin-bottom: var(--space-xl); display: flex; flex-direction: column; gap: 0.5rem; }
.section-num { font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600; color: var(--accent-color); letter-spacing: 0.1em; text-transform: uppercase; display: flex; align-items: center; gap: 0.75rem; }
.section-num::before { content: ''; display: inline-block; width: 24px; height: 1px; background-color: var(--accent-color); }
.section-title { font-size: clamp(2rem, 4vw, 2.75rem); font-weight: 800; letter-spacing: -0.03em; color: var(--text-primary); line-height: 1.1; }
.section-subtitle { font-size: 1.125rem; color: var(--text-secondary); max-width: 650px; margin-top: 0.5rem; line-height: 1.6; }

/* ==========================================================================
   BUTTONS & TAGS
   ========================================================================== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.75rem 1.75rem; font-size: 0.95rem; font-weight: 600; border-radius: var(--radius-sm); transition: all var(--transition-normal); cursor: pointer; border: 1px solid transparent; letter-spacing: 0.01em; }
.btn-primary { background-color: var(--text-primary); color: var(--bg-primary); }
.btn-primary:hover { background-color: var(--accent-color); color: var(--bg-primary); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-secondary { background-color: var(--bg-primary); border-color: var(--border-medium); color: var(--text-primary); }
.btn-secondary:hover { border-color: var(--text-primary); transform: translateY(-2px); box-shadow: var(--shadow-sm); background-color: var(--bg-secondary); }

.tag { display: inline-flex; align-items: center; font-size: 0.8rem; font-weight: 600; font-family: var(--font-mono); padding: 0.35rem 0.85rem; background: var(--bg-tertiary); border: 1px solid var(--border-light); border-radius: 20px; color: var(--text-secondary); transition: all var(--transition-fast); }
.tag:hover { border-color: var(--border-strong); color: var(--text-primary); background: var(--bg-primary); transform: translateY(-1px); }
.tech-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
body > header { position: sticky; top: 0; background: rgba(255, 255, 255, 0.75); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); z-index: 1000; transition: all var(--transition-normal); padding: 1.25rem 0; border-bottom: 1px solid transparent; }
body > header.scrolled { padding: 0.75rem 0; border-bottom: 1px solid var(--border-light); box-shadow: 0 4px 20px rgba(15, 23, 42, 0.03); }
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1400px; margin: 0 auto; padding-left: var(--space-lg); padding-right: var(--space-lg); }
.logo { font-size: 1.15rem; font-weight: 800; color: var(--text-primary); letter-spacing: -0.02em; }
.nav-links { display: flex; gap: 2.5rem; align-items: center; }
.nav-links a { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); transition: color var(--transition-fast); position: relative; padding: 0.25rem 0; }
.nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0%; height: 2px; background-color: var(--accent-color); transition: width var(--transition-normal); }
.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: var(--text-primary); }
.nav-links a.active::after { width: 100%; }

.nav-actions { display: flex; gap: 1.5rem; align-items: center; }
.nav-actions .icon-link { color: var(--text-secondary); font-size: 0.9rem; font-weight: 600; transition: color var(--transition-fast); }
.nav-actions .icon-link:hover { color: var(--accent-color); }
.hamburger { display: none; background: none; border: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 0.5rem; z-index: 1001; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text-primary); transition: all var(--transition-normal); }

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: var(--space-xl); align-items: center; padding-top: 3rem; padding-bottom: 5rem; border-bottom: none; }
.hero-content { display: flex; flex-direction: column; align-items: flex-start; }
.hero-label { display: inline-flex; align-items: center; font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; color: var(--accent-color); margin-bottom: 1.5rem; text-transform: uppercase; }
.hero-title { font-size: clamp(3rem, 6vw, 4.5rem); font-weight: 800; line-height: 1.05; margin-bottom: 1rem; letter-spacing: -0.04em; color: var(--text-primary); }
.hero-subtitle { font-size: clamp(1.25rem, 2.5vw, 1.75rem); font-weight: 600; color: var(--text-secondary); margin-bottom: 1.5rem; line-height: 1.3; max-width: 550px; letter-spacing: -0.01em; }
.hero-desc { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 2.5rem; max-width: 550px; line-height: 1.7; }
.hero-buttons { display: flex; gap: 1rem; align-items: center; }

.hero-profile-wrapper { position: relative; width: 100%; max-width: 380px; margin: 0 auto; display: flex; align-items: center; justify-content: center; }
.hero-profile-wrapper::after { content: ''; position: absolute; inset: 15px; border-radius: 50%; border: 1px solid var(--border-light); z-index: -1; pointer-events: none; }
.hero-profile-img { width: 100%; height: auto; aspect-ratio: 1/1; border-radius: 50%; object-fit: cover; border: 8px solid var(--bg-primary); box-shadow: var(--shadow-hover); background-color: var(--bg-tertiary); transition: transform var(--transition-slow); }
.hero-profile-wrapper:hover .hero-profile-img { transform: scale(1.02); }

/* ==========================================================================
   GRIDS & EDITORIAL CARDS
   ========================================================================== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-xl); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }

.card { padding: 2.5rem; background: var(--bg-primary); border: 1px solid var(--border-light); border-radius: var(--radius-lg); transition: all var(--transition-normal); display: flex; flex-direction: column; height: 100%; box-shadow: var(--shadow-sm); position: relative; overflow: hidden; }
.card:hover { border-color: var(--border-medium); transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.card-icon { width: 40px; height: 40px; border-radius: var(--radius-sm); background: var(--accent-light); color: var(--accent-color); display: flex; align-items: center; justify-content: center; margin-bottom: 1.5rem; }
.card-icon svg { width: 20px; height: 20px; }
.card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.75rem; color: var(--text-primary); letter-spacing: -0.01em; }
.card p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 2rem; flex-grow: 1; line-height: 1.6; }

/* --- COMPACT SKILLS GRID --- */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.skills-grid .card { padding: 1.5rem; }
.skills-grid .card h3 { font-size: 1.1rem; }
.skills-grid .card p { display: none; } 
.skills-grid .tech-tags { display: flex; flex-direction: column; align-items: flex-start; gap: 0.4rem; margin-top: 1rem; }
.skills-grid .tag { background: transparent; border: none; padding: 0; font-size: 0.9rem; color: var(--text-secondary); }
.skills-grid .tag::before { content: '▹'; color: var(--accent-color); margin-right: 0.5rem; font-weight: 800; }
.skills-grid .tag:hover { color: var(--text-primary); transform: translateX(3px); background: transparent; }

/* ==========================================================================
   PROJECTS & MODAL SYSTEM
   ========================================================================== */
.projects-overview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.project-summary-card { display: flex; flex-direction: column; justify-content: space-between; }
.project-summary-card .btn { margin-top: 1.5rem; align-self: flex-start; }

.project-modal { display: none; position: fixed; inset: 0; background: rgba(15, 23, 42, 0.85); z-index: 3000; overflow-y: auto; padding: 2rem 1rem; backdrop-filter: blur(6px); opacity: 0; transition: opacity var(--transition-normal); }
.project-modal.active { display: block; opacity: 1; }
.modal-content { background: var(--bg-primary); max-width: 1100px; margin: 2rem auto; border-radius: var(--radius-lg); padding: 3rem; position: relative; transform: translateY(20px); transition: transform var(--transition-normal); box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25); }
.project-modal.active .modal-content { transform: translateY(0); }
.close-modal { position: absolute; top: 1.5rem; right: 1.5rem; background: var(--bg-secondary); border: 1px solid var(--border-medium); font-size: 1.5rem; width: 45px; height: 45px; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all var(--transition-fast); color: var(--text-secondary); z-index: 10; }
.close-modal:hover { background: var(--text-primary); color: var(--bg-primary); transform: rotate(90deg); }
body.no-scroll { overflow: hidden; }

.project-content h3 { font-size: 2rem; font-weight: 800; margin-bottom: 1rem; letter-spacing: -0.02em; line-height: 1.2; }
.project-metrics { display: flex; flex-wrap: wrap; gap: 2rem; margin: 2rem 0; padding: 1.5rem; background: var(--bg-primary); border-radius: var(--radius-md); border: 1px solid var(--border-light); box-shadow: var(--shadow-sm); }
.metric { display: flex; flex-direction: column; gap: 0.25rem; }
.metric-val { font-size: 2rem; font-weight: 800; color: var(--text-primary); line-height: 1; letter-spacing: -0.03em; }
.metric-label { font-size: 0.7rem; color: var(--text-secondary); text-transform: uppercase; font-family: var(--font-mono); letter-spacing: 0.05em; font-weight: 600; }

.project-arch-text { font-family: var(--font-mono); font-size: 0.85rem; padding: 2rem; background: var(--bg-tertiary); color: var(--text-primary); border-radius: var(--radius-md); line-height: 1.8; border: 1px solid var(--border-light); margin-bottom: 1.5rem; }
.project-arch-text .comment { color: var(--text-tertiary); margin-bottom: 0.5rem; display: block; }
.engineering-decisions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; margin: 2.5rem 0; }
.decision-card { padding: 1.5rem; background: var(--bg-secondary); border: 1px solid var(--border-light); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
.decision-card h4 { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.5rem; }
.decision-card h4::before { content: '✓'; color: var(--accent-color); font-weight: 800; }
.decision-card p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.5; margin: 0; }
.project-architecture-img { width: 100%; border-radius: var(--radius-md); border: 1px solid var(--border-light); box-shadow: var(--shadow-sm); margin: 2rem 0; object-fit: contain; background: var(--bg-primary); }

.project-dashboards { margin: 3rem 0 1rem; border-top: 1px solid var(--border-light); padding-top: 2rem; }
.project-dashboards h4 { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); margin-bottom: 0.5rem; letter-spacing: -0.01em; }
.project-dashboards > p { color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 1.5rem; }
.dashboard-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.dashboard-main { grid-column: 1 / -1; }
.dashboard-img { width: 100%; height: auto; border-radius: var(--radius-sm); border: 1px solid var(--border-light); box-shadow: var(--shadow-sm); transition: transform var(--transition-normal), box-shadow var(--transition-normal); object-fit: cover; }
.dashboard-img:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); z-index: 10; position: relative; }

/* Elegant CSS Pipeline Visual */
.pipeline-flow { padding: 2rem; background: var(--bg-primary); border: 1px solid var(--border-light); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); display: flex; flex-direction: column; gap: 0; position: relative; }
.pipe-node { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.5rem; background: var(--bg-secondary); border: 1px solid var(--border-medium); border-radius: var(--radius-sm); font-size: 0.85rem; font-weight: 600; font-family: var(--font-mono); color: var(--text-primary); z-index: 2; position: relative; }
.pipe-node.highlight { border-color: var(--accent-color); background: var(--bg-primary); color: var(--accent-color); box-shadow: 0 4px 12px rgba(14, 116, 144, 0.08); }
.pipe-edge { height: 20px; width: 2px; background: var(--border-light); margin: 0 auto; position: relative; z-index: 1; overflow: hidden; }
.pipe-edge::before { content: ''; position: absolute; top: -100%; left: 0; width: 100%; height: 100%; background: var(--accent-color); animation: dataFlow 2s infinite cubic-bezier(0.4, 0, 0.2, 1); }
@keyframes dataFlow { 0% { top: -100%; } 100% { top: 100%; } }

/* ==========================================================================
   ABOUT, TIMELINES & INTERESTS
   ========================================================================== */
.about-content { font-size: 1.1rem; color: var(--text-secondary); line-height: 1.8; }
.about-content p { margin-bottom: 1.5rem; }
.about-content h3 { margin: 2rem 0 1rem; font-size: 1.5rem; color: var(--text-primary); font-weight: 800; letter-spacing: -0.02em; }
.profile-img-wrapper { position: relative; border-radius: var(--radius-lg); padding: 1rem; border: 1px solid var(--border-light); background: var(--bg-primary); box-shadow: var(--shadow-sm); }
.profile-img { width: 100%; border-radius: var(--radius-md); filter: grayscale(15%); transition: filter var(--transition-normal); }
.profile-img-wrapper:hover .profile-img { filter: grayscale(0%); }

.timeline { display: flex; flex-direction: column; gap: 2.5rem; }
.timeline-item { position: relative; padding-left: 2.5rem; border-left: 2px solid var(--border-light); }
.timeline-item::before { content: ''; position: absolute; left: -7px; top: 0.35rem; width: 12px; height: 12px; border-radius: 50%; background: var(--bg-primary); border: 2px solid var(--text-primary); transition: border-color var(--transition-fast); }
.timeline-item:hover::before { border-color: var(--accent-color); background: var(--accent-color); }
.timeline-date { font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600; color: var(--text-tertiary); margin-bottom: 0.5rem; display: block; }
.timeline-title { font-size: 1.25rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.25rem; }
.timeline-subtitle { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 1rem; font-weight: 500; }
.timeline-item p, .timeline-item ul { font-size: 0.95rem; color: var(--text-secondary); }

.interest-list { display: flex; flex-wrap: wrap; gap: 1rem; color: var(--text-primary); font-weight: 600; font-size: 1rem; margin-top: 1rem; }
.interest-list .dot { color: var(--border-medium); font-size: 0.8rem; }

/* ==========================================================================
   CERTIFICATIONS
   ========================================================================== */
.cert-card { display: flex; flex-direction: column; align-items: flex-start; padding: 2.5rem; background: var(--bg-primary); border: 1px solid var(--border-light); border-radius: var(--radius-lg); transition: all var(--transition-normal); height: 100%; box-shadow: var(--shadow-sm); }
.cert-card:hover { border-color: var(--border-medium); transform: translateY(-4px); box-shadow: var(--shadow-md); }
.cert-provider { font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700; color: var(--accent-color); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1rem; }
.cert-card h3 { font-size: 1.25rem; font-weight: 800; margin-bottom: 1rem; line-height: 1.4; color: var(--text-primary); letter-spacing: -0.01em; }
.cert-card p { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 2rem; flex-grow: 1; }

.filter-group { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 3rem; }
.filter-btn { padding: 0.5rem 1.25rem; background: var(--bg-primary); border: 1px solid var(--border-light); border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 600; color: var(--text-secondary); cursor: pointer; transition: all var(--transition-fast); }
.filter-btn:hover { border-color: var(--text-primary); color: var(--text-primary); }
.filter-btn.active { background: var(--text-primary); color: var(--bg-primary); border-color: var(--text-primary); }

/* ==========================================================================
   FOOTER & CONTACT
   ========================================================================== */
footer { padding: 5rem 0 2rem; background: var(--bg-primary); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 4rem; }
.footer-col h4 { font-size: 1.1rem; font-weight: 800; margin-bottom: 1.5rem; color: var(--text-primary); }
.footer-col ul { display: flex; flex-direction: column; gap: 1rem; }
.footer-col a { color: var(--text-secondary); font-size: 0.95rem; font-weight: 500; }
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom { padding-top: 2rem; border-top: 1px solid var(--border-light); display: flex; justify-content: center; align-items: center; color: var(--text-secondary); font-size: 0.85rem; text-align: center; }

/* ==========================================================================
   PDF VIEWER (WIDE)
   ========================================================================== */
.pdf-main-container { width: 95%; max-width: 1600px; margin: 0 auto; padding: 4rem 0; }
.pdf-viewer-container { width: 100%; height: 85vh; min-height: 700px; border: 1px solid var(--border-medium); border-radius: var(--radius-lg); overflow: hidden; margin: 2rem 0; background: var(--bg-secondary); box-shadow: var(--shadow-md); }
.pdf-viewer-container iframe { width: 100%; height: 100%; border: none; display: block; }

/* ==========================================================================
   ANIMATIONS (SCROLL REVEAL)
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity var(--transition-slow), transform var(--transition-slow); will-change: opacity, transform; }
.reveal.active { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 100ms; }
.delay-2 { transition-delay: 200ms; }
.delay-3 { transition-delay: 300ms; }
.delay-4 { transition-delay: 400ms; }

/* ==========================================================================
   RESPONSIVE DESIGN (INCLUDING MOBILE HERO ORDER FIX)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; text-align: center; gap: 3rem; padding-top: 3rem; padding-bottom: 4rem; }
  .hero-profile-wrapper { order: -1; max-width: 320px; margin: 0 auto; }
  .hero-content { order: 2; align-items: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  
  .projects-overview-grid { grid-template-columns: 1fr; }
  .modal-content { padding: 2rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .pdf-viewer-container { height: 80vh; }
}

@media (max-width: 768px) {
  :root { --space-section: 3rem; } /* Compacted normalized mobile gap */
  
  .nav-links, .nav-actions { display: none; }
  .hamburger { display: flex; }
  .nav-container.menu-open .nav-links,
  .nav-container.menu-open .nav-actions { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; width: 100%; background: var(--bg-primary); padding: 2rem; border-bottom: 1px solid var(--border-light); box-shadow: var(--shadow-sm); align-items: flex-start; }
  .nav-container.menu-open .nav-actions { top: calc(100% + 220px); border-top: 1px solid var(--border-light); border-bottom: none; box-shadow: var(--shadow-md); }
  
  .hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .hamburger.active span:nth-child(2) { opacity: 0; }
  .hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* Mobile Hero specific constraints */
  .hero { padding-top: 2rem; padding-bottom: 3rem; gap: 2rem; }
  .hero-profile-wrapper { max-width: 240px; margin-bottom: 0.5rem; order: -1; } /* Image First */
  .hero-content { order: 2; }
  
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .engineering-decisions { grid-template-columns: 1fr; gap: 1rem; }
  .dashboard-gallery { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .project-metrics { gap: 1rem; }
  .pdf-viewer-container { min-height: 500px; height: 75vh; }
}

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .pipe-edge::before { animation: none; display: none; }
}

/* ==========================================================================
   BLOG & EDITORIAL STYLES
   ========================================================================== */
.blog-hero { padding: 8rem 0 4rem; text-align: center; border-bottom: none; position: relative; }
.blog-hero-label { font-family: var(--font-mono); font-size: 0.85rem; font-weight: 700; color: var(--accent-color); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1rem; display: block; }
.blog-hero-title { font-size: clamp(2.5rem, 4vw, 3.5rem); font-weight: 800; letter-spacing: -0.03em; color: var(--text-primary); margin-bottom: 1.5rem; line-height: 1.1; }
.blog-hero-subtitle { font-size: 1.15rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; line-height: 1.6; }

.blog-controls-container { border-top: 1px solid var(--border-light); border-bottom: 1px solid var(--border-light); padding: 1rem 0; background: rgba(255, 255, 255, 0.9); position: sticky; top: 68px; z-index: 999; backdrop-filter: blur(8px); }
.blog-controls { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; }
.blog-filters { display: flex; gap: 1.5rem; overflow-x: auto; padding-bottom: 4px; scrollbar-width: none; }
.blog-filters::-webkit-scrollbar { display: none; }
.blog-filter-btn { background: none; border: none; font-size: 0.9rem; font-weight: 600; color: var(--text-secondary); cursor: pointer; transition: color var(--transition-fast); white-space: nowrap; padding: 0.25rem 0; border-bottom: 2px solid transparent; }
.blog-filter-btn:hover { color: var(--text-primary); }
.blog-filter-btn.active { color: var(--text-primary); border-bottom-color: var(--accent-color); }

.blog-actions { display: flex; gap: 1rem; align-items: center; }
.blog-search-wrapper { position: relative; }
.blog-search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-tertiary); font-size: 0.9rem; }
.blog-search { padding: 0.5rem 1rem 0.5rem 2.25rem; font-size: 0.9rem; border: 1px solid var(--border-medium); border-radius: 20px; outline: none; transition: border-color var(--transition-fast); width: 220px; font-family: var(--font-main); }
.blog-search:focus { border-color: var(--accent-color); box-shadow: 0 0 0 3px var(--accent-light); }
.blog-sort { padding: 0.5rem 1rem; font-size: 0.9rem; border: 1px solid var(--border-medium); border-radius: 20px; outline: none; background: var(--bg-primary); cursor: pointer; font-family: var(--font-main); color: var(--text-secondary); }

.featured-article-container { padding: 4rem 0; border-bottom: 1px solid var(--border-light); }
.featured-card { display: flex; flex-direction: column; padding: 4rem; background: var(--bg-primary); border: 1px solid var(--border-medium); border-radius: var(--radius-lg); transition: all var(--transition-normal); box-shadow: var(--shadow-sm); max-width: 1000px; margin: 0 auto; position: relative; overflow: hidden; }
.featured-card::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px; background: var(--accent-color); }
.featured-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--text-primary); }
.featured-card .article-meta { font-size: 0.9rem; margin-bottom: 1.5rem; font-weight: 600; color: var(--text-secondary); }
.featured-card h2 { font-size: 2.25rem; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 1.5rem; color: var(--text-primary); line-height: 1.2; }
.featured-card .article-excerpt { font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 2rem; max-width: 800px; }

.editorial-grid { padding: 5rem 0; min-height: 50vh; }
.editorial-card { display: flex; flex-direction: column; padding: 2.5rem; background: var(--bg-primary); border: 1px solid var(--border-light); border-radius: var(--radius-lg); transition: all var(--transition-normal); height: 100%; box-shadow: var(--shadow-sm); position: relative; overflow: hidden; }
.editorial-card:hover { border-color: var(--border-medium); box-shadow: var(--shadow-md); transform: translateY(-4px); }
.editorial-card h3 { font-size: 1.35rem; font-weight: 800; margin-bottom: 1rem; color: var(--text-primary); line-height: 1.4; letter-spacing: -0.01em; }
.read-more { margin-top: auto; padding-top: 1.5rem; display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; font-weight: 600; color: var(--text-primary); }
.read-more-arrow { transition: transform var(--transition-fast); }
.editorial-card:hover .read-more-arrow { transform: translateX(4px); color: var(--accent-color); }

.category-Data-Engineering { color: var(--accent-color); font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.05em; text-transform: uppercase; }
.category-Thoughts { color: var(--text-tertiary); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; font-size: 0.75rem; }
.category-Poetry { color: var(--text-secondary); font-family: var(--font-serif); font-style: italic; font-size: 0.95rem; }

.blog-empty-state { text-align: center; padding: 6rem 0; color: var(--text-secondary); }
.blog-empty-state h3 { font-size: 1.5rem; color: var(--text-primary); margin-bottom: 0.5rem; font-weight: 800; }

.article-page-header { position: static; background: transparent; backdrop-filter: none; -webkit-backdrop-filter: none; z-index: auto; padding: 6rem 0 3rem; text-align: center; border-bottom: 1px solid var(--border-light); margin-bottom: 4rem; }
.article-page-category { font-family: var(--font-mono); font-size: 0.85rem; font-weight: 700; color: var(--accent-color); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1.5rem; display: inline-block; }
.article-page-title { font-size: clamp(2rem, 4vw, 3.5rem); font-weight: 800; color: var(--text-primary); letter-spacing: -0.03em; line-height: 1.15; max-width: 800px; margin: 0 auto 1.5rem; }
.article-page-meta { font-size: 0.95rem; color: var(--text-tertiary); font-weight: 500; }

.article-body { max-width: 720px; margin: 0 auto; padding-bottom: 4rem; font-size: 1.1rem; color: var(--text-primary); line-height: 1.8; }
.article-body p { margin-bottom: 1.75rem; color: var(--text-secondary); }
.article-body h2 { font-size: 1.75rem; font-weight: 800; margin: 3rem 0 1.25rem; color: var(--text-primary); letter-spacing: -0.01em; }
.article-body h3 { font-size: 1.35rem; font-weight: 700; margin: 2rem 0 1rem; }
.article-body ul, .article-body ol { margin: 0 0 2rem 2rem; color: var(--text-secondary); }
.article-body li { margin-bottom: 0.75rem; }
.article-body blockquote { border-left: 4px solid var(--accent-color); padding-left: 1.5rem; margin: 2rem 0; font-size: 1.25rem; font-style: italic; color: var(--text-primary); }
.article-body pre { background: var(--text-primary); color: var(--bg-secondary); padding: 1.5rem; border-radius: var(--radius-md); overflow-x: auto; margin: 2rem 0; font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.6; }
.article-body code { background: var(--bg-secondary); padding: 0.2em 0.4em; border-radius: 4px; font-size: 0.9em; font-family: var(--font-mono); color: var(--accent-color); }
.article-body pre code { background: transparent; padding: 0; color: inherit; }

.poetry-body { max-width: 600px; text-align: left; font-family: var(--font-serif); font-size: 1.25rem; line-height: 2; padding-left: 10%; }
.poetry-body p { margin-bottom: 2rem; color: var(--text-primary); white-space: pre-wrap; }

.related-articles { background: var(--bg-secondary); padding: 6rem 0; border-top: 1px solid var(--border-light); }
.related-header { font-size: 1.5rem; font-weight: 800; margin-bottom: 2rem; text-align: center; letter-spacing: -0.01em; }

@media (max-width: 768px) {
  .blog-controls { flex-direction: column; align-items: flex-start; }
  .blog-actions { width: 100%; justify-content: space-between; }
  .blog-search { width: 100%; }
  .featured-card { padding: 2rem; }
  .featured-card h2 { font-size: 1.75rem; }
  .article-page-title { font-size: 2rem; }
  .poetry-body { padding-left: 0; text-align: center; }
}

/* ==========================================================================
   INTERACTIVE PIPELINE VISUALIZATION
   ========================================================================== */
.interactive-pipeline { margin: 3rem 0; padding: 2.5rem; background: var(--bg-secondary); border: 1px solid var(--border-light); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.pipeline-header-block { margin-bottom: 2rem; }
.pipeline-header-block h4 { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); letter-spacing: -0.01em; margin-bottom: 0.5rem; }
.pipeline-header-block p { color: var(--text-secondary); font-size: 1.05rem; }

.pipeline-controls { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; margin-bottom: 2rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border-light); }
.view-toggle { display: flex; background: var(--bg-primary); border: 1px solid var(--border-medium); border-radius: var(--radius-sm); overflow: hidden; }
.toggle-btn { padding: 0.5rem 1rem; font-size: 0.85rem; font-weight: 600; border: none; background: transparent; color: var(--text-secondary); cursor: pointer; transition: all var(--transition-fast); font-family: var(--font-main); }
.toggle-btn.active { background: var(--text-primary); color: var(--bg-primary); }

.pipeline-layout { display: flex; flex-direction: column; gap: 2rem; }
.pipeline-progress { font-family: var(--font-mono); font-size: 0.8rem; font-weight: 700; color: var(--accent-color); text-transform: uppercase; letter-spacing: 0.05em; }

/* Desktop: Horizontal Track */
.pipeline-track { display: flex; align-items: center; justify-content: space-between; position: relative; margin-bottom: 1rem; }
.pipeline-track::before { content: ''; position: absolute; top: 50%; left: 0; right: 0; height: 2px; background: var(--border-medium); z-index: 1; transform: translateY(-50%); }

.pipeline-node-wrapper { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.pipeline-node { width: 24px; height: 24px; border-radius: 50%; background: var(--bg-primary); border: 3px solid var(--border-medium); transition: all var(--transition-normal); display: flex; align-items: center; justify-content: center; }
.pipeline-node.active { border-color: var(--accent-color); background: var(--bg-primary); box-shadow: 0 0 0 4px var(--accent-light); }
.pipeline-node.completed { background: var(--accent-color); border-color: var(--accent-color); }
.pipeline-node-label { font-size: 0.75rem; font-weight: 600; color: var(--text-secondary); font-family: var(--font-mono); position: absolute; top: 30px; white-space: nowrap; text-align: center; opacity: 0.5; transition: opacity var(--transition-fast); }
.pipeline-node.active ~ .pipeline-node-label, .pipeline-node.completed ~ .pipeline-node-label { opacity: 1; color: var(--text-primary); }

/* Moving Data Packet */
.data-packet { position: absolute; top: 50%; left: 0; width: 10px; height: 10px; background: var(--accent-color); border-radius: 50%; transform: translate(-50%, -50%); z-index: 3; opacity: 0; transition: left 1.2s cubic-bezier(0.4, 0, 0.2, 1), top 1.2s cubic-bezier(0.4, 0, 0.2, 1); box-shadow: 0 0 10px var(--accent-color); pointer-events: none; }
.data-packet.active { opacity: 1; }

/* Info Panel */
.pipeline-info-panel { background: var(--bg-primary); padding: 2rem; border-radius: var(--radius-md); border: 1px solid var(--border-light); min-height: 220px; transition: all var(--transition-normal); box-shadow: var(--shadow-sm); }
.pipeline-info-title { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); margin-bottom: 0.5rem; letter-spacing: -0.01em; }
.pipeline-info-tech { display: inline-block; font-family: var(--font-mono); font-size: 0.8rem; background: var(--bg-tertiary); padding: 0.25rem 0.75rem; border-radius: 20px; color: var(--accent-color); font-weight: 600; margin-bottom: 1rem; border: 1px solid var(--border-light); }
.pipeline-info-desc { font-size: 1.05rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 1.5rem; }

/* Dynamic Visual Elements inside Panel */
.visual-data-list { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.visual-data-card { font-size: 0.85rem; font-weight: 600; padding: 0.4rem 0.8rem; background: var(--bg-secondary); border: 1px solid var(--border-medium); border-radius: var(--radius-sm); color: var(--text-primary); animation: slideIn 0.3s ease-out forwards; opacity: 0; transform: translateY(10px); }
.visual-check-list { display: flex; flex-direction: column; gap: 0.5rem; }
.visual-check-item { font-size: 0.95rem; color: var(--text-secondary); display: flex; align-items: center; gap: 0.5rem; animation: slideIn 0.3s ease-out forwards; opacity: 0; transform: translateX(-10px); }
.visual-check-item::before { content: '✓'; color: var(--accent-color); font-weight: 800; }
.panel-img { max-width: 100%; height: auto; border-radius: var(--radius-sm); border: 1px solid var(--border-light); margin-top: 1rem; animation: fadeIn 0.5s ease-out; }

/* Final State Summary */
.pipeline-final-state { background: var(--bg-primary); padding: 3rem 2rem; border-radius: var(--radius-md); border: 1px solid var(--border-light); text-align: center; animation: fadeIn 0.5s ease-out; }
.pipeline-final-state h3 { font-size: 2rem; font-weight: 800; color: var(--text-primary); margin-bottom: 1.5rem; letter-spacing: -0.02em; }
.final-metrics-grid { display: flex; justify-content: center; flex-wrap: wrap; gap: 2rem; margin-bottom: 2.5rem; }
.final-flow { font-family: var(--font-mono); font-size: 0.9rem; font-weight: 600; color: var(--text-secondary); display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 2.5rem; padding: 1rem; background: var(--bg-secondary); border-radius: var(--radius-sm); }
.final-flow span { color: var(--text-primary); }

@keyframes slideIn { to { opacity: 1; transform: translate(0, 0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* Mobile: Vertical Flow */
@media (max-width: 768px) {
  .pipeline-controls { flex-direction: column; align-items: flex-start; }
  .pipeline-layout { flex-direction: row; }
  .pipeline-track { flex-direction: column; align-items: center; min-width: 60px; height: 100%; margin-bottom: 0; padding-top: 10px; }
  .pipeline-track::before { top: 0; bottom: 0; left: 50%; right: auto; width: 2px; height: 100%; transform: translateX(-50%); }
  .pipeline-node-wrapper { flex-direction: row; width: 100%; justify-content: center; margin-bottom: 2rem; }
  .pipeline-node-label { display: none; } /* Hide labels on mobile to save space, relies on info panel */
  .data-packet { transition: top 1.2s cubic-bezier(0.4, 0, 0.2, 1); }
  .pipeline-info-panel { flex-grow: 1; display: flex; flex-direction: column; justify-content: center; min-height: 350px; }
}

@media (prefers-reduced-motion: reduce) {
  .data-packet { display: none !important; }
  .visual-data-card, .visual-check-item, .panel-img { animation: none !important; opacity: 1 !important; transform: none !important; }
}

/* ==========================================================================
   PROJECT GRID & LABELS
   ========================================================================== */
/* Update the existing projects grid to a 2x2 layout */
.projects-overview-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.project-type-label { font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700; color: var(--accent-color); text-transform: uppercase; letter-spacing: 0.05em; display: block; margin-bottom: 0.5rem; }

/* ==========================================================================
   FULL SCREEN PDF VIEWER
   ========================================================================== */
.pdf-main-container { width: 95vw; max-width: none; margin: 0 auto; padding: 2rem 0; display: flex; flex-direction: column; align-items: center; }
.pdf-header-actions { display: flex; gap: 1rem; justify-content: center; margin-bottom: 1.5rem; width: 100%; flex-wrap: wrap; }
.pdf-viewer-container { width: 100%; height: 88vh; min-height: 600px; border: 1px solid var(--border-medium); border-radius: var(--radius-lg); overflow: hidden; background: var(--bg-secondary); box-shadow: var(--shadow-md); }
.pdf-viewer-container iframe { width: 100%; height: 100%; border: none; display: block; }

/* ==========================================================================
   SENTINEL AI SIMULATOR (Vertical Flow)
   ========================================================================== */
.sentinel-sim-container { background: var(--bg-secondary); padding: 2.5rem; border-radius: var(--radius-lg); border: 1px solid var(--border-light); margin: 2rem 0; box-shadow: var(--shadow-sm); }
.sentinel-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.5rem; border-bottom: 1px solid var(--border-medium); padding-bottom: 1.5rem; }
.sentinel-header h4 { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); letter-spacing: -0.01em; margin-bottom: 0.25rem; }
.sentinel-header p { color: var(--text-secondary); font-size: 1.05rem; }

.sentinel-flow { display: flex; flex-direction: column; position: relative; }
.sentinel-step { display: flex; align-items: flex-start; gap: 1.5rem; margin-bottom: 0; padding-bottom: 2.5rem; position: relative; opacity: 0.4; transition: opacity 0.4s ease, transform 0.4s ease; transform: translateX(-10px); }
.sentinel-step::after { content: ''; position: absolute; left: 23px; top: 48px; bottom: 0; width: 2px; background: var(--border-medium); z-index: 1; }
.sentinel-step:last-child { padding-bottom: 0; }
.sentinel-step:last-child::after { display: none; }

.sentinel-step.active, .sentinel-step.completed { opacity: 1; transform: translateX(0); }
.sentinel-icon { width: 48px; height: 48px; min-width: 48px; border-radius: 50%; background: var(--bg-primary); border: 2px solid var(--border-strong); display: flex; align-items: center; justify-content: center; font-weight: 700; z-index: 2; position: relative; font-family: var(--font-mono); font-size: 1.1rem; color: var(--text-secondary); transition: all 0.3s ease; }
.sentinel-step.active .sentinel-icon { background: var(--accent-color); color: var(--bg-primary); border-color: var(--accent-color); box-shadow: 0 0 15px rgba(14, 116, 144, 0.3); }
.sentinel-step.completed .sentinel-icon { background: var(--text-primary); color: var(--bg-primary); border-color: var(--text-primary); }

.sentinel-content { padding-top: 0.5rem; }
.sentinel-title { font-size: 1.15rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.25rem; display: flex; align-items: center; gap: 0.75rem; }
.sentinel-tech { font-family: var(--font-mono); font-size: 0.75rem; padding: 0.2rem 0.6rem; background: var(--bg-tertiary); border: 1px solid var(--border-light); border-radius: 20px; color: var(--accent-color); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.sentinel-desc { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; margin-top: 0.5rem; }

@media (max-width: 768px) {
  .projects-overview-grid { grid-template-columns: 1fr; }
  .pdf-viewer-container { height: 80vh; min-height: 500px; }
  .sentinel-sim-container { padding: 1.5rem; }
  .sentinel-step { gap: 1rem; }
}