/* ===================================================
   Muhammad Akif Naveed — Portfolio Stylesheet
   Design: Premium Dark · Editorial · AI-Focused
   =================================================== */

/* ===== RESET & VARIABLES ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #080a0f;
  --bg-2:      #0c0f16;
  --bg-3:      #111520;
  --surface:   rgba(255,255,255,0.04);
  --surface-b: rgba(255,255,255,0.07);
  --border:    rgba(255,255,255,0.08);
  --border-b:  rgba(255,255,255,0.14);

  --text:      #e8eaf0;
  --text-muted:#8a8fa8;
  --text-dim:  #555a6e;

  --accent:    #5b8bf7;
  --accent-2:  #8b5cf6;
  --accent-glow: rgba(91,139,247,0.18);

  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Mono', monospace;
  --font-serif:   'Instrument Serif', serif;

  --radius:    12px;
  --radius-sm: 6px;
  --transition: 0.28s cubic-bezier(0.4,0,0.2,1);
  --max-w:     1120px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.7;
  font-weight: 300;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: #fff; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-b); border-radius: 2px; }

/* ===== UTILITY ===== */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }
.section { padding: 7rem 0; }

.section-label {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.section-heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 3.5rem;
  color: var(--text);
}
.section-heading em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--text-muted);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 24px var(--accent-glow);
}
.btn-primary:hover { background: #4a7af5; transform: translateY(-1px); box-shadow: 0 0 36px rgba(91,139,247,0.3); }
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-b);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost { background: var(--surface); color: var(--text-muted); }
.btn-ghost:hover { background: var(--surface-b); color: var(--text); }

/* ===== REVEAL ANIMATIONS ===== */
.reveal {
  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.visible { opacity: 1; transform: none; }

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(8,10,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}
.nav-links a {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-muted);
  transition: var(--transition);
}

.nav-mobile {
  display: none;
  flex-direction: column;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 1.2rem 2rem;
  gap: 1rem;
}
.nav-mobile a {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}
.nav-mobile a:hover { color: var(--text); }
.nav-mobile.open { display: flex; }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 7rem 2rem 4rem;
}

#heroCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 5rem;
}

/* Hero Image */
.hero-image-wrap {
  flex-shrink: 0;
  position: relative;
  width: 220px;
  height: 220px;
}
.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--border-b);
  display: block;
}
.hero-initials {
  display: none;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--bg-3);
  border: 2px solid var(--border-b);
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
}
.hero-photo-ring {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  opacity: 0.3;
  animation: ring-pulse 3s ease-in-out infinite;
}
@keyframes ring-pulse {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(1.04); opacity: 0.6; }
}

/* Hero Text */
.hero-text { flex: 1; }

.hero-label {
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.hero-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.hero-heading {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.hero-accent {
  color: var(--accent);
  font-weight: 300;
  margin: 0 0.3rem;
}
.hero-typed { color: var(--accent); }
.hero-cursor {
  display: inline-block;
  width: 2px;
  color: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 0%,100% { opacity:1; } 50% { opacity:0; } }

.hero-sub {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 520px;
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.badge {
  font-size: 0.68rem;
  font-family: var(--font-body);
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: 50px;
  background: var(--surface);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  opacity: 0.4;
}
.hero-scroll-hint span {
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-muted), transparent);
  animation: scroll-down 2s ease-in-out infinite;
}
@keyframes scroll-down {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===== ABOUT ===== */
.about { background: var(--bg-2); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.about-left p {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1.2rem;
  line-height: 1.85;
}

.about-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.stat { display: flex; flex-direction: column; gap: 0.3rem; }
.stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.stat-label { font-size: 0.7rem; color: var(--text-dim); letter-spacing: 0.05em; }

.skills-grid { display: flex; flex-direction: column; gap: 1.5rem; }

.skill-category h4 {
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.skill-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.skill-tags span {
  font-size: 0.72rem;
  font-family: var(--font-body);
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  transition: var(--transition);
}
.skill-tags span:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-glow), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}
.project-card:hover { border-color: var(--border-b); transform: translateY(-3px); }
.project-card:hover::before { opacity: 1; }
.project-card.featured { border-color: rgba(91,139,247,0.2); }

.project-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
}
.project-number {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.6;
}
.project-tag {
  font-size: 0.65rem;
  font-family: var(--font-body);
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.project-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.project-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 1.2rem;
}

.project-tech { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1.5rem; }
.project-tech span {
  font-size: 0.65rem;
  font-family: var(--font-body);
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(91,139,247,0.25);
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
}

.project-links { display: flex; gap: 1rem; align-items: center; }
.project-link {
  font-size: 0.75rem;
  font-family: var(--font-body);
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}
.project-link:hover { color: var(--accent); }
.project-link-live { color: var(--accent); }

.projects-more {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
}
.projects-more p {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1.2rem;
}
.more-repos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}
.more-repos a {
  font-size: 0.72rem;
  font-family: var(--font-body);
  color: var(--text-muted);
  text-decoration: none;
  background: var(--bg-3);
  border: 1px solid var(--border);
  padding: 0.35rem 0.85rem;
  border-radius: 50px;
  transition: var(--transition);
}
.more-repos a:hover { border-color: var(--accent); color: var(--accent); }

/* ===== RESEARCH ===== */
.research { background: var(--bg-2); }

.research-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3rem;
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 3rem;
  align-items: start;
  position: relative;
  overflow: hidden;
}
.research-card::after {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(139,92,246,0.12), transparent 70%);
  pointer-events: none;
}

.research-card-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}
.research-icon {
  width: 80px;
  height: 80px;
  color: var(--accent-2);
  opacity: 0.7;
}
.research-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  font-family: var(--font-body);
  color: #4ade80;
  letter-spacing: 0.05em;
}
.status-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #4ade80;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { opacity: 1; } 50% { opacity: 0.3; }
}

.research-card-right h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  line-height: 1.3;
}
.research-card-right p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 2rem;
}

.research-tech-row { display: flex; flex-direction: column; gap: 1.2rem; }
.research-tech-group {}
.research-tech-label {
  display: block;
  font-size: 0.65rem;
  font-family: var(--font-body);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}
.research-tech-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.research-tech-tags span {
  font-size: 0.68rem;
  color: var(--text-muted);
  background: var(--bg-3);
  border: 1px solid var(--border);
  padding: 0.25rem 0.65rem;
  border-radius: 50px;
}

/* ===== TIMELINE ===== */
.timeline-section {}

.timeline {
  position: relative;
  padding-left: 3rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0.9rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), var(--border), var(--accent));
  opacity: 0.3;
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: -3rem;
  top: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-3);
  border: 1px solid var(--border-b);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.timeline-marker span {
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-muted);
}

.timeline-item-active .timeline-marker {
  background: var(--accent-glow);
  border-color: var(--accent);
}
.timeline-item-active .timeline-marker span { color: var(--accent); }

.timeline-body {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  flex: 1;
  transition: var(--transition);
}
.timeline-body:hover { border-color: var(--border-b); }
.timeline-item-active .timeline-body { border-color: rgba(91,139,247,0.25); }

.timeline-meta {
  font-size: 0.65rem;
  font-family: var(--font-body);
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.timeline-body h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.75rem;
}
.timeline-body p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}
.timeline-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.timeline-tags span {
  font-size: 0.65rem;
  font-family: var(--font-body);
  color: var(--text-dim);
  background: var(--bg-3);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
}

/* ===== CERTIFICATIONS ===== */
.certs-section { background: var(--bg-2); }

.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.cert-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0;
}
.cert-card:hover { border-color: var(--border-b); transform: translateY(-2px); }

.cert-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
}
.cert-icon {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(91,139,247,0.3);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}
.cert-badge-status {
  font-size: 0.65rem;
  font-family: var(--font-body);
  color: #4ade80;
  background: rgba(74,222,128,0.1);
  border: 1px solid rgba(74,222,128,0.25);
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
}

.cert-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.3rem;
}
.cert-issuer { font-size: 0.72rem; color: var(--accent); margin-bottom: 0.75rem; letter-spacing: 0.03em; }
.cert-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.75; margin-bottom: 1.2rem; }
.cert-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 1.5rem; align-content: flex-start; }
.cert-tags span {
  font-size: 0.65rem;
  color: var(--text-dim);
  background: var(--bg-3);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
  white-space: nowrap;
}
.cert-preview-btn {
  align-self: flex-start;
  font-size: 0.73rem;
  font-family: var(--font-body);
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(91,139,247,0.3);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
}
.cert-preview-btn:hover { background: rgba(91,139,247,0.25); }

/* ===== ACHIEVEMENTS ===== */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.achievement-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
}
.achievement-card:hover { border-color: var(--border-b); transform: translateY(-2px); }

.achievement-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  line-height: 1;
}
.achievement-rank {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.4rem;
}
.achievement-card h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}
.achievement-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 1.2rem;
  flex: 1;
}
.achievement-img-btn {
  font-size: 0.7rem;
  font-family: var(--font-body);
  color: var(--text-dim);
  background: var(--bg-3);
  border: 1px solid var(--border);
  padding: 0.4rem 0.85rem;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
}
.achievement-img-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Leadership */
.leadership-grid { margin-top: 1rem; }
.leadership-grid h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.leadership-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.leadership-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition);
}
.leadership-card:hover { border-color: var(--border-b); }
.leadership-tag {
  font-size: 0.62rem;
  font-family: var(--font-body);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 0.5rem;
}
.leadership-card h4 {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
  line-height: 1.3;
}
.leadership-card p { font-size: 0.78rem; color: var(--text-muted); line-height: 1.7; }

/* ===== CONTACT ===== */
.contact-section { background: var(--bg-2); }

.contact-sub {
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.8;
  margin-bottom: 3rem;
  margin-top: -2rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.contact-card:hover { border-color: var(--accent); transform: translateY(-2px); background: var(--accent-glow); }
.contact-icon {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--accent);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  border: 1px solid rgba(91,139,247,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
}
.contact-label {
  font-size: 0.65rem;
  font-family: var(--font-body);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.contact-value {
  font-size: 0.78rem;
  color: var(--text-muted);
  word-break: break-all;
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-name {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
}
.footer-copy { font-size: 0.72rem; color: var(--text-dim); }
.footer-gh {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-gh:hover { color: var(--accent); }

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(12px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}
.modal-overlay.open { display: flex; }

.modal-box {
  background: var(--bg-2);
  border: 1px solid var(--border-b);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 1rem; right: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 32px; height: 32px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.8rem;
  transition: var(--transition);
}
.modal-close:hover { color: var(--text); border-color: var(--border-b); }
.modal-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
  padding-right: 2rem;
}
.modal-img { width: 100%; border-radius: var(--radius-sm); display: block; }
.modal-placeholder {
  padding: 3rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.82rem;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px dashed var(--border-b);
  line-height: 2;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-content { gap: 3rem; }
  .hero-image-wrap { width: 180px; height: 180px; }
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .projects-grid { grid-template-columns: 1fr; }
  .certs-grid { grid-template-columns: 1fr; }
  .achievements-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .research-card { grid-template-columns: 120px 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  .hero-content { flex-direction: column; text-align: center; padding: 0 1rem; gap: 2rem; }
  .hero-label { justify-content: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-badges { justify-content: center; }

  .section { padding: 5rem 0; }
  .section-heading { font-size: clamp(1.8rem, 6vw, 2.5rem); }

  .research-card { grid-template-columns: 1fr; }
  .research-card-left { flex-direction: row; justify-content: flex-start; }

  .achievements-grid { grid-template-columns: 1fr; }
  .leadership-cards { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }

  .timeline { padding-left: 2.5rem; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .contact-grid { grid-template-columns: 1fr; }
  .about-stats { gap: 1.5rem; }
  .hero-cta { flex-direction: column; align-items: center; }
  .hero-cta .btn { width: 100%; justify-content: center; }
}


/* ===== RESEARCH REFERENCE BLOCK ===== */
.research-reference {
  margin-top: 1.8rem;
  border-top: 1px solid var(--border);
  padding-top: 1.2rem;
}

.research-ref-label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.65rem;
  font-family: var(--font-body);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.85rem;
}
.research-ref-icon { font-size: 0.8rem; }

.research-ref-body {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.research-ref-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.research-ref-name {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}
.research-ref-affil {
  font-size: 0.72rem;
  font-family: var(--font-body);
  color: var(--text-muted);
  line-height: 1.5;
}

.research-ref-email {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.73rem;
  font-family: var(--font-body);
  color: var(--accent);
  text-decoration: none;
  background: var(--accent-glow);
  border: 1px solid rgba(91,139,247,0.25);
  padding: 0.45rem 0.9rem;
  border-radius: 50px;
  transition: var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}
.research-ref-email:hover {
  background: rgba(91,139,247,0.2);
  box-shadow: 0 0 14px var(--accent-glow);
  transform: translateY(-1px);
}
.research-ref-email-icon { font-style: normal; }

/* ===== CREDENTIAL VERIFY BUTTON (green — Credsverse/Certifier) ===== */
.cert-verify-cred {
  background: #166534 !important;
  border-color: rgba(22,101,52,0.6) !important;
  color: #bbf7d0 !important;
}
.cert-verify-cred:hover {
  background: #15803d !important;
  box-shadow: 0 0 16px rgba(22,163,74,0.3) !important;
}
.cert-verify-cred-icon {
  font-size: 0.75rem;
  font-weight: 800;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #4ade80;
  color: #14532d;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  line-height: 1;
}

/* Stack cert-actions buttons on small screens */
@media (max-width: 480px) {
  .cert-actions { gap: 0.6rem; }
  .cert-verify-btn { font-size: 0.68rem; padding: 0.45rem 0.8rem; }
  .research-ref-body { flex-direction: column; align-items: flex-start; }
}
.cert-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: auto;
}

/* LinkedIn verify button */
.cert-verify-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: flex-start;
  font-size: 0.73rem;
  font-family: var(--font-body);
  color: #fff;
  background: #0a66c2;
  border: 1px solid rgba(10,102,194,0.5);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
}
.cert-verify-btn:hover {
  background: #0958a8;
  box-shadow: 0 0 16px rgba(10,102,194,0.35);
  transform: translateY(-1px);
}
.cert-verify-li-icon {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.7rem;
  background: #fff;
  color: #0a66c2;
  width: 18px;
  height: 18px;
  border-radius: 3px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* PNY issuer note (no public verification system exists) */
.cert-verify-note {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
}
.cert-verify-icon {
  font-size: 0.8rem;
  flex-shrink: 0;
  margin-top: 0.05rem;
}
.cert-verify-text {
  font-size: 0.68rem;
  font-family: var(--font-body);
  color: var(--text-dim);
  line-height: 1.6;
}