/* ═══════════════════════════════════════════════════════════════
   DR. SULEYMAN YILDIRIM — PREMIUM PERSONAL WEBSITE
   Design System: Executive · AI-Native · Minimal · Impactful
   ═══════════════════════════════════════════════════════════════ */

/* ── DESIGN TOKENS ───────────────────────────────────────────── */
:root {
  /* Color Palette */
  --bg-primary:    #05091a;
  --bg-secondary:  #080e24;
  --bg-surface:    #0c1530;
  --bg-card:       #0f1d3d;
  --bg-card-hover: #132448;

  --accent-cyan:    #00d4ff;
  --accent-blue:    #3b82f6;
  --accent-purple:  #7c3aed;
  --accent-green:   #10b981;
  --accent-amber:   #f59e0b;

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #475569;
  --text-inverse:   #05091a;

  --border-subtle:  rgba(255,255,255,0.06);
  --border-medium:  rgba(255,255,255,0.12);
  --border-accent:  rgba(0,212,255,0.3);

  --glow-cyan:  0 0 40px rgba(0,212,255,0.15);
  --glow-blue:  0 0 40px rgba(59,130,246,0.15);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --section-gap: clamp(80px, 10vw, 140px);
  --container-max: 1200px;
  --container-pad: clamp(20px, 5vw, 60px);

  /* Transitions */
  --t-fast:   0.15s ease;
  --t-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --t-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── RESET ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ── SCROLLBAR ────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-cyan); border-radius: 2px; }

/* ── SELECTION ────────────────────────────────────────────────── */
::selection { background: rgba(0, 212, 255, 0.2); color: var(--text-primary); }

/* ── LAYOUT UTILITIES ─────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.section {
  padding: var(--section-gap) 0;
}

.section-header {
  text-align: center;
  margin-bottom: clamp(48px, 6vw, 80px);
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 16px;
  padding: 6px 14px;
  border: 1px solid rgba(0,212,255,0.25);
  border-radius: 100px;
  background: rgba(0,212,255,0.05);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── NAVIGATION ───────────────────────────────────────────────── */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  transition: all var(--t-smooth);
}

.nav-header.scrolled {
  background: rgba(5, 9, 26, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-initials {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-inverse);
  flex-shrink: 0;
}

.logo-initials.small {
  width: 28px;
  height: 28px;
  font-size: 0.7rem;
  border-radius: 7px;
}

.logo-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 8px;
  transition: all var(--t-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

.nav-link.nav-cta {
  background: rgba(0,212,255,0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(0,212,255,0.2);
}

.nav-link.nav-cta:hover {
  background: rgba(0,212,255,0.2);
  border-color: rgba(0,212,255,0.4);
}

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

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--t-smooth);
}

/* ── HERO ─────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 100px 0 60px;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0,100,200,0.12) 0%, transparent 70%),
              radial-gradient(ellipse 40% 40% at 20% 80%, rgba(0,212,255,0.05) 0%, transparent 60%),
              linear-gradient(to bottom, transparent 60%, var(--bg-primary) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 0 var(--container-pad);
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  padding: 8px 16px;
  border: 1px solid var(--border-medium);
  border-radius: 100px;
  margin-bottom: 32px;
  background: rgba(255,255,255,0.03);
  backdrop-filter: blur(10px);
}

.badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse-dot 2s infinite;
  flex-shrink: 0;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16,185,129,0.4); }
  50% { box-shadow: 0 0 0 6px rgba(16,185,129,0); }
}

.hero-name {
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 900;
  line-height: 1.0;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.accent-dot {
  color: var(--accent-cyan);
}

.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 1.8em;
  font-family: var(--font-mono);
}

.typed-cursor {
  display: inline-block;
  animation: blink 1s infinite;
  color: var(--accent-cyan);
  margin-left: 2px;
}

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

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 48px;
  line-height: 1.75;
}

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

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 48px;
  padding: 28px 40px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-medium);
  border-radius: 20px;
  backdrop-filter: blur(10px);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 32px;
  flex: 1;
  min-width: 100px;
}

.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
}

.stat-value-wrap {
  display: flex;
  align-items: baseline;
  line-height: 1;
}

.stat-plus, .stat-dollar {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-cyan);
  line-height: 1;
}

.stat-dollar {
  font-size: 1.2rem;
}

.stat-label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 6px;
  white-space: nowrap;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: var(--border-medium);
  flex-shrink: 0;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--t-smooth);
}

.btn-primary {
  background: var(--accent-cyan);
  color: var(--text-inverse);
  box-shadow: 0 4px 24px rgba(0,212,255,0.25);
}

.btn-primary:hover {
  background: #22dfff;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,212,255,0.4);
}

.btn-ghost {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-ghost:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  z-index: 2;
  opacity: 0.5;
}

.hero-scroll-indicator span {
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scroll-bounce 2s infinite;
}

@keyframes scroll-bounce {
  0%, 100% { transform: scaleY(1); transform-origin: top; }
  50% { transform: scaleY(0.6); }
}

/* ── ABOUT ────────────────────────────────────────────────────── */
.about-section {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
}

.about-visual {
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: sticky;
  top: 100px;
}

.about-avatar-wrap {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto;
}

.avatar-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
}

.ring-1 {
  inset: -16px;
  border-color: rgba(0,212,255,0.15);
  animation: ring-pulse 4s infinite;
}

.ring-2 {
  inset: -28px;
  border-color: rgba(0,212,255,0.08);
  animation: ring-pulse 4s 1s infinite;
}

.ring-3 {
  inset: -40px;
  border-color: rgba(0,212,255,0.04);
  animation: ring-pulse 4s 2s infinite;
}

@keyframes ring-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.02); }
}

.avatar-inner {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-surface), var(--bg-card));
  border: 2px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glow-cyan);
}

.avatar-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.avatar-initials {
  display: none;
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-credentials {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.credential-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  transition: all var(--t-smooth);
}

.credential-item:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.credential-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.credential-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.credential-sub {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 3px;
}

.about-content { padding-top: 8px; }

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

.about-bio p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-bio p strong {
  color: var(--text-primary);
  font-weight: 600;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  transition: all var(--t-fast);
}

.tag:hover {
  border-color: var(--border-accent);
  color: var(--accent-cyan);
}

/* ── EXPERTISE ────────────────────────────────────────────────── */
.expertise-section {
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

.expertise-section::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59,130,246,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.expertise-card {
  padding: 32px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  transition: all var(--t-smooth);
  position: relative;
  overflow: hidden;
}

.expertise-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  opacity: 0;
  transition: opacity var(--t-smooth);
}

.expertise-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3), var(--glow-cyan);
}

.expertise-card:hover::after {
  opacity: 1;
}

.expertise-icon-wrap {
  margin-bottom: 24px;
}

.expertise-icon {
  width: 48px;
  height: 48px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.15);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  transition: all var(--t-smooth);
}

.expertise-icon svg {
  width: 22px;
  height: 22px;
}

.expertise-card:hover .expertise-icon {
  background: rgba(0,212,255,0.15);
  border-color: rgba(0,212,255,0.4);
  box-shadow: 0 0 20px rgba(0,212,255,0.15);
}

.expertise-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.expertise-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.expertise-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.expertise-tech span {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--accent-cyan);
  padding: 3px 10px;
  background: rgba(0,212,255,0.06);
  border: 1px solid rgba(0,212,255,0.15);
  border-radius: 100px;
}

/* ── TECH STACK ───────────────────────────────────────────────── */
.techstack-section {
  background: var(--bg-secondary);
}

.tech-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
}

.tech-category {}

.tech-cat-title {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}

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

.tech-pill {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  transition: all var(--t-fast);
}

.tech-pill:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
}

/* ── EXPERIENCE ───────────────────────────────────────────────── */
.experience-section {
  background: var(--bg-primary);
}

.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--border-subtle) 80%, transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

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

.timeline-marker {
  position: absolute;
  left: -38px;
  top: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.marker-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--border-medium);
  transition: all var(--t-smooth);
  position: relative;
  z-index: 1;
}

.marker-pulse {
  position: absolute;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid rgba(0,212,255,0.3);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(1.5); opacity: 0; }
}

.timeline-item.current .marker-dot {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0,212,255,0.5);
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 28px 32px;
  transition: all var(--t-smooth);
}

.timeline-item.current .timeline-card {
  border-color: rgba(0,212,255,0.2);
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0,212,255,0.03) 100%);
}

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

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
  gap: 20px;
  flex-wrap: wrap;
}

.timeline-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}

.timeline-company {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.timeline-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  flex-shrink: 0;
}

.timeline-period {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  font-family: var(--font-mono);
  padding: 4px 12px;
  background: var(--bg-surface);
  border-radius: 100px;
  border: 1px solid var(--border-subtle);
}

.current-badge {
  background: rgba(0,212,255,0.08) !important;
  color: var(--accent-cyan) !important;
  border-color: rgba(0,212,255,0.2) !important;
}

.timeline-location {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.timeline-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.timeline-achievements {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.timeline-achievements li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.achievement-icon {
  color: var(--accent-cyan);
  font-size: 0.7rem;
  margin-top: 5px;
  flex-shrink: 0;
  font-weight: 700;
}

.timeline-achievements strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ── PROJECTS ─────────────────────────────────────────────────── */
.projects-section {
  background: var(--bg-secondary);
  position: relative;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 28px 28px 24px;
  transition: all var(--t-smooth);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.project-card .project-accent {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  opacity: 0;
  transition: opacity var(--t-smooth);
}

.project-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.35), var(--glow-cyan);
}

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

.project-card.featured {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0,60,120,0.3) 100%);
  border-color: rgba(0,212,255,0.15);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.project-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.project-tag {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
}

.tag-ml     { background: rgba(59,130,246,0.12); color: #60a5fa; border: 1px solid rgba(59,130,246,0.2); }
.tag-opt    { background: rgba(124,58,237,0.12); color: #a78bfa; border: 1px solid rgba(124,58,237,0.2); }
.tag-prod   { background: rgba(16,185,129,0.12); color: #34d399; border: 1px solid rgba(16,185,129,0.2); }
.tag-rt     { background: rgba(245,158,11,0.12); color: #fbbf24; border: 1px solid rgba(245,158,11,0.2); }
.tag-hc     { background: rgba(239,68,68,0.12);  color: #f87171; border: 1px solid rgba(239,68,68,0.2); }
.tag-retail { background: rgba(20,184,166,0.12); color: #2dd4bf; border: 1px solid rgba(20,184,166,0.2); }
.tag-mmm    { background: rgba(168,85,247,0.12); color: #c084fc; border: 1px solid rgba(168,85,247,0.2); }
.tag-strat  { background: rgba(251,191,36,0.12); color: #fde047; border: 1px solid rgba(251,191,36,0.2); }
.tag-ts     { background: rgba(6,182,212,0.12);  color: #22d3ee; border: 1px solid rgba(6,182,212,0.2); }

.project-impact {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  white-space: nowrap;
  flex-shrink: 0;
}

.project-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.project-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

.project-tech span {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 3px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
}

/* ── LEADERSHIP ───────────────────────────────────────────────── */
.leadership-section {
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

.leadership-section::before {
  content: '';
  position: absolute;
  top: 50%;
  right: -200px;
  transform: translateY(-50%);
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124,58,237,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.leadership-grid {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
}

.leadership-text {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 40px;
}

.leadership-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.leadership-pillars {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.pillar {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.pillar-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.pillar h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pillar p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.vision-card {
  padding: 32px;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(124,58,237,0.08) 100%);
  border: 1px solid rgba(124,58,237,0.2);
  border-radius: 20px;
  margin-bottom: 24px;
  position: relative;
}

.vision-card::before {
  content: '"';
  position: absolute;
  top: -10px;
  left: 24px;
  font-size: 6rem;
  line-height: 1;
  color: var(--accent-purple);
  opacity: 0.3;
  font-family: Georgia, serif;
}

.vision-quote {
  font-size: 1rem;
  color: var(--text-primary);
  line-height: 1.75;
  font-style: italic;
  font-weight: 400;
  margin-bottom: 16px;
}

.vision-author {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-purple);
  letter-spacing: 0.05em;
}

.awards-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.award-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  transition: all var(--t-fast);
}

.award-item:hover {
  border-color: rgba(245,158,11,0.2);
  background: var(--bg-card-hover);
}

.award-year {
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-amber);
  width: 36px;
  flex-shrink: 0;
}

.award-name {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ── RESEARCH ─────────────────────────────────────────────────── */
.research-section {
  background: var(--bg-secondary);
}

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.research-areas h3,
.publications h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}

.research-area-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.research-area-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.ra-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: rgba(59,130,246,0.08);
  border: 1px solid rgba(59,130,246,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-blue);
  flex-shrink: 0;
}

.ra-icon svg { width: 18px; height: 18px; }

.research-area-item h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.research-area-item p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.pub-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  transition: all var(--t-fast);
}

.pub-item:hover {
  border-color: var(--border-medium);
  background: var(--bg-card-hover);
}

.pub-type {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 6px;
  white-space: nowrap;
  margin-top: 2px;
  flex-shrink: 0;
}

.pub-item.journal .pub-type  { background: rgba(16,185,129,0.1); color: #34d399; border: 1px solid rgba(16,185,129,0.2); }
.pub-item.conference .pub-type { background: rgba(59,130,246,0.1); color: #60a5fa; border: 1px solid rgba(59,130,246,0.2); }
.pub-item:not(.journal):not(.conference) .pub-type { background: rgba(124,58,237,0.1); color: #a78bfa; border: 1px solid rgba(124,58,237,0.2); }

.pub-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 5px;
}

.pub-venue {
  font-size: 0.78rem;
  color: var(--accent-cyan);
  margin-bottom: 3px;
}

.pub-authors {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── CONTACT ──────────────────────────────────────────────────── */
.contact-section {
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

.contact-section::before {
  content: '';
  position: absolute;
  top: 0; left: 50%; transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse at center top, rgba(0,212,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.contact-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.contact-title {
  max-width: 700px;
  margin: 0 auto 20px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 48px 0 32px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 28px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  transition: all var(--t-smooth);
  cursor: pointer;
}

.contact-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--glow-cyan);
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.contact-icon svg { width: 20px; height: 20px; }

.contact-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.contact-value {
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-align: center;
  word-break: break-all;
  transition: color var(--t-fast);
}

.contact-card:hover .contact-value {
  color: var(--text-primary);
}

.contact-availability {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 10px 20px;
  background: rgba(16,185,129,0.05);
  border: 1px solid rgba(16,185,129,0.15);
  border-radius: 100px;
}

.avail-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse-dot 2s infinite;
  flex-shrink: 0;
}

/* ── FOOTER ───────────────────────────────────────────────────── */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer-links a {
  font-size: 0.78rem;
  color: var(--text-muted);
  transition: color var(--t-fast);
}

.footer-links a:hover { color: var(--accent-cyan); }

/* ── SCROLL ANIMATIONS ────────────────────────────────────────── */
.reveal,
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.is-visible,
.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Hero delay classes (handled in JS, but CSS fallback) */
.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.30s; }
.delay-3 { transition-delay: 0.45s; }
.delay-4 { transition-delay: 0.60s; }
.delay-5 { transition-delay: 0.75s; }

/* ── RESPONSIVE ───────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .expertise-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid  { grid-template-columns: repeat(2, 1fr); }
  .project-card.featured { grid-column: span 2; }
  .leadership-grid { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-visual { position: static; }
  .research-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; max-width: 360px; }
}

@media (max-width: 720px) {
  .expertise-grid { grid-template-columns: 1fr; }
  .projects-grid  { grid-template-columns: 1fr; }
  .project-card.featured { grid-column: span 1; }
  .hero-stats { padding: 20px 16px; }
  .stat-item { padding: 0 16px; }
  .stat-divider { height: 32px; }

  .nav-links {
    display: none;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: rgba(5,9,26,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid var(--border-subtle);
  }
  .nav-links.open { display: flex; }
  .nav-link { text-align: center; padding: 12px; }
  .nav-toggle { display: flex; }

  .timeline { padding-left: 24px; }
  .timeline-marker { left: -30px; }

  .about-avatar-wrap { width: 150px; height: 150px; }
  .avatar-inner { width: 150px; height: 150px; }
  .ring-1 { inset: -10px; }
  .ring-2 { inset: -18px; }
  .ring-3 { inset: -26px; }
}

@media (max-width: 480px) {
  .stat-divider { display: none; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-item { padding: 0; flex-direction: row; gap: 12px; align-items: center; justify-content: center; }
  .stat-label { margin-top: 0; }
  .timeline-header { flex-direction: column; }
  .timeline-meta { align-items: flex-start; }
}