/* =========================================================
   saraga.gr — Professional Website Styles
   Design: Dark academia meets modern scientific portfolio
   ========================================================= */

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

:root {
  --c-bg:          #0b0f1a;
  --c-surface:     #111827;
  --c-surface2:    #1a2235;
  --c-border:      rgba(255,255,255,0.08);
  --c-accent:      #4ecdc4;
  --c-accent2:     #a78bfa;
  --c-gold:        #f5c842;
  --c-text:        #e2e8f0;
  --c-text-muted:  #8892a4;
  --c-text-dim:    #4b5768;
  --c-white:       #ffffff;
  --font-sans:     'Inter', system-ui, sans-serif;
  --font-serif:    'Playfair Display', Georgia, serif;
  --radius-sm:     8px;
  --radius-md:     14px;
  --radius-lg:     24px;
  --shadow-card:   0 4px 32px rgba(0,0,0,0.4);
  --shadow-glow:   0 0 40px rgba(78,205,196,0.15);
  --transition:    0.3s cubic-bezier(0.4,0,0.2,1);
}

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

body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--c-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-white); }

img { display: block; max-width: 100%; }

/* --- Utility --- */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: rgba(78,205,196,0.1);
  border: 1px solid rgba(78,205,196,0.25);
  border-radius: 100px;
  padding: 4px 14px;
  margin-bottom: 14px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.2;
}

.section-subtitle {
  margin-top: 14px;
  color: var(--c-text-muted);
  font-size: 1.05rem;
  max-width: 620px;
  margin-inline: auto;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: 0.93rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--c-accent), #2eb8b0);
  color: #0b0f1a;
  box-shadow: 0 4px 20px rgba(78,205,196,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(78,205,196,0.5);
  color: #0b0f1a;
}

.btn-outline {
  background: transparent;
  color: var(--c-text);
  border: 1.5px solid var(--c-border);
}
.btn-outline:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  transform: translateY(-2px);
}

.btn-outline-sm {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  background: transparent;
  color: var(--c-text-muted);
  border: 1.5px solid var(--c-border);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-outline-sm:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.btn-sm {
  padding: 9px 22px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--c-accent), #2eb8b0);
  color: #0b0f1a;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-sm:hover { transform: translateY(-2px); color: #0b0f1a; }

/* ==========================================
   NAVBAR
   ========================================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--transition);
}

.navbar.scrolled {
  padding: 12px 0;
  background: rgba(11,15,26,0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--c-border);
}

.nav-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo-name {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--c-white);
  font-weight: 700;
}
.logo-title {
  font-size: 0.72rem;
  color: var(--c-accent);
  letter-spacing: 0.06em;
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
  list-style: none;
}

.nav-link {
  color: var(--c-text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  transition: all var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--c-white);
  background: rgba(255,255,255,0.06);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ==========================================
   HERO
   ========================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(78,205,196,0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 20% 60%, rgba(167,139,250,0.06) 0%, transparent 50%),
    url('../images/hero-bg.png') center/cover no-repeat;
  z-index: 0;
}

#particle-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 580px;
}

.hero-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: rgba(78,205,196,0.1);
  border: 1px solid rgba(78,205,196,0.3);
  border-radius: 100px;
  padding: 6px 18px;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 6vw, 5.5rem);
  line-height: 1.08;
  color: var(--c-white);
  font-weight: 700;
  margin-bottom: 22px;
}
.hero-title em {
  font-style: italic;
  color: var(--c-accent);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--c-text-muted);
  margin-bottom: 40px;
  line-height: 1.75;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 40px;
}

.stat {
  display: flex;
  flex-direction: column;
  padding: 0 28px;
}
.stat:first-child { padding-left: 0; }

.stat-number {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--c-text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--c-border);
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Portrait */
.hero-portrait-wrap {
  position: absolute;
  right: max(5%, 40px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: clamp(280px, 35vw, 480px);
}

.hero-portrait-ring {
  position: absolute;
  inset: -16px;
  border-radius: 50% 40% 60% 45% / 55% 50% 45% 50%;
  border: 2px solid rgba(78,205,196,0.25);
  animation: morphRing 8s ease-in-out infinite alternate;
}

@keyframes morphRing {
  0%   { border-radius: 50% 40% 60% 45% / 55% 50% 45% 50%; }
  50%  { border-radius: 45% 55% 45% 55% / 40% 60% 40% 55%; }
  100% { border-radius: 60% 40% 50% 55% / 50% 45% 55% 45%; }
}

.hero-portrait {
  width: 100%;
  border-radius: 50% 40% 60% 45% / 55% 50% 45% 50%;
  object-fit: cover;
  filter: drop-shadow(0 20px 60px rgba(78,205,196,0.2));
  animation: morphImg 8s ease-in-out infinite alternate;
}

@keyframes morphImg {
  0%   { border-radius: 50% 40% 60% 45% / 55% 50% 45% 50%; }
  50%  { border-radius: 45% 55% 45% 55% / 40% 60% 40% 55%; }
  100% { border-radius: 60% 40% 50% 55% / 50% 45% 55% 45%; }
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  justify-content: center;
}
.scroll-arrow {
  display: block;
  width: 22px;
  height: 22px;
  border-right: 2px solid var(--c-accent);
  border-bottom: 2px solid var(--c-accent);
  transform: rotate(45deg);
  animation: bounce 1.6s ease-in-out infinite;
  opacity: 0.6;
}
@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: 0.6; }
  50%       { transform: rotate(45deg) translateY(6px); opacity: 1; }
}

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

.about-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 56px;
  align-items: start;
}

.about-lead {
  font-size: 1.15rem;
  color: var(--c-text);
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-text p {
  color: var(--c-text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
}

.about-memberships {
  margin-top: 32px;
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
}

.about-memberships h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  margin-bottom: 14px;
  font-weight: 600;
}

.about-memberships ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.about-memberships li {
  font-size: 0.9rem;
  color: var(--c-text-muted);
  padding-left: 20px;
  position: relative;
}
.about-memberships li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--c-accent);
}

.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition);
}
.card:hover { border-color: rgba(78,205,196,0.3); }

.card-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}
.card-icon { font-size: 1rem; }

.timeline-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.timeline-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.tl-year {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--c-accent);
  background: rgba(78,205,196,0.1);
  border-radius: 6px;
  padding: 4px 8px;
  white-space: nowrap;
  margin-top: 2px;
}

.tl-content {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  line-height: 1.5;
}
.tl-content strong { color: var(--c-text); }
.tl-content small { color: var(--c-text-dim); font-size: 0.8rem; }

.affiliation-card p {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}
.card-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--c-accent);
}

/* ==========================================
   RESEARCH
   ========================================== */
.research {
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-surface) 100%);
}

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

.research-card {
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(24px);
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(78,205,196,0.04) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.research-card:hover {
  border-color: rgba(78,205,196,0.35);
  transform: translateY(-4px);
  box-shadow:  0 12px 40px rgba(0,0,0,0.3), var(--shadow-glow);
}
.research-card:hover::before { opacity: 1; }

.research-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.rc-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  background: rgba(78,205,196,0.1);
  border: 1px solid rgba(78,205,196,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--c-accent);
  transition: all var(--transition);
}
.research-card:hover .rc-icon {
  background: rgba(78,205,196,0.2);
  transform: scale(1.05);
}
.rc-icon svg { width: 28px; height: 28px; }

.research-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 10px;
  line-height: 1.35;
}

.research-card p {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

.rc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.rc-tags span {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--c-accent);
  background: rgba(78,205,196,0.08);
  border: 1px solid rgba(78,205,196,0.2);
  border-radius: 100px;
  padding: 3px 10px;
  letter-spacing: 0.04em;
}

/* ==========================================
   PROJECTS
   ========================================== */
.projects { background: var(--c-surface); }

.projects-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.project-item {
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 26px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.project-item:hover {
  border-color: rgba(78,205,196,0.3);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.project-item.featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(78,205,196,0.06) 0%, var(--c-surface2) 60%);
  border-color: rgba(78,205,196,0.2);
  padding: 32px;
}

.pi-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.pi-badge {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gold);
  background: rgba(245,200,66,0.1);
  border: 1px solid rgba(245,200,66,0.25);
  border-radius: 100px;
  padding: 3px 10px;
}

.pi-year {
  font-size: 0.8rem;
  color: var(--c-text-dim);
  font-weight: 500;
}

.pi-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 4px;
}

.project-item:not(.featured) .pi-title {
  font-size: 1.1rem;
}

.pi-full {
  font-size: 0.82rem;
  color: var(--c-accent);
  font-weight: 500;
  margin-bottom: 10px;
  font-style: italic;
}

.pi-desc {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  line-height: 1.65;
}

/* ==========================================
   PUBLICATIONS
   ========================================== */
.publications {
  background: linear-gradient(180deg, var(--c-surface) 0%, var(--c-bg) 100%);
}

.pub-highlights {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 40px;
}

.pub-card {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  transition: all var(--transition);
}

.pub-card:hover {
  border-color: rgba(167,139,250,0.35);
  transform: translateX(4px);
  box-shadow: var(--shadow-card);
}

.pub-year {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-accent2);
  min-width: 48px;
  padding-top: 2px;
}

.pub-content h4 {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 6px;
  line-height: 1.45;
}

.pub-meta {
  font-size: 0.82rem;
  color: var(--c-accent);
  margin-bottom: 8px;
}

.pub-abstract {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  line-height: 1.65;
}

.pub-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  padding-top: 8px;
}

/* ==========================================
   TALKS
   ========================================== */
.talks { background: var(--c-bg); }

.talks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.talk-card {
  display: block;
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.talk-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.talk-card:hover {
  border-color: rgba(78,205,196,0.3);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}
.talk-card:hover::after { transform: scaleX(1); }

.talk-date {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.talk-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 10px;
  line-height: 1.45;
}

.talk-card p {
  font-size: 0.85rem;
  color: var(--c-text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
}

.talk-cta {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--c-accent);
}

/* YouTube feature bar */
.youtube-feature {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 20px 28px;
}

.yt-icon svg {
  width: 44px; height: 44px;
  border-radius: 10px;
}

.yt-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.yt-text strong {
  font-size: 0.92rem;
  color: var(--c-white);
}
.yt-text span {
  font-size: 0.82rem;
  color: var(--c-text-muted);
}

/* ==========================================
   CONTACT
   ========================================== */
.contact {
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-surface) 100%);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.contact-lead {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  margin-bottom: 32px;
  line-height: 1.75;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 36px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  font-size: 0.9rem;
  color: var(--c-text-muted);
  line-height: 1.6;
}
.contact-item strong { color: var(--c-text); display: block; margin-bottom: 2px; }

.ci-icon {
  font-size: 1.2rem;
  line-height: 1;
  margin-top: 2px;
}

.contact-profiles h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-text-dim);
  margin-bottom: 14px;
  font-weight: 600;
}

.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.profile-btn {
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--c-text-muted);
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  transition: all var(--transition);
}
.profile-btn:hover {
  color: var(--c-accent);
  border-color: rgba(78,205,196,0.4);
}

.contact-map-wrap {
  display: flex;
  align-items: stretch;
}

.map-placeholder {
  flex: 1;
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 60px 40px;
  text-align: center;
  min-height: 280px;
  background-image:
    radial-gradient(circle at 50% 50%, rgba(78,205,196,0.06) 0%, transparent 70%),
    linear-gradient(135deg, var(--c-surface2) 60%, rgba(78,205,196,0.04) 100%);
}

.map-pin { font-size: 2.5rem; }

.map-placeholder p {
  color: var(--c-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.footer-name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1rem;
  color: var(--c-white);
}
.footer-tagline {
  font-size: 0.78rem;
  color: var(--c-text-dim);
}

.footer-nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.footer-nav a {
  font-size: 0.82rem;
  color: var(--c-text-dim);
  padding: 5px 10px;
  border-radius: 6px;
  transition: all var(--transition);
}
.footer-nav a:hover { color: var(--c-text); background: rgba(255,255,255,0.05); }

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

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 1024px) {
  .research-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .about-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .about-sidebar .card { margin-bottom: 0; }

  .hero-portrait-wrap {
    position: relative;
    right: auto; top: auto;
    transform: none;
    width: 260px;
    margin: 0 auto;
    order: -1;
  }
  .hero {
    flex-direction: column;
    text-align: center;
    padding: 120px 24px 60px;
  }
  .hero-stats { justify-content: center; }
  .hero-actions { justify-content: center; }
  .hero-content { max-width: 100%; }
}

@media (max-width: 768px) {
  .section { padding: 70px 0; }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(11,15,26,0.97);
    backdrop-filter: blur(20px);
    padding: 20px;
    gap: 6px;
    border-bottom: 1px solid var(--c-border);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .research-grid { grid-template-columns: 1fr; }
  .projects-list { grid-template-columns: 1fr; }
  .project-item.featured { grid-column: 1; }
  .talks-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .about-sidebar { grid-template-columns: 1fr; }

  .hero-stats {
    flex-wrap: wrap;
    gap: 20px;
  }
  .stat-divider { display: none; }
  .stat { padding: 0; }

  .footer-inner { flex-direction: column; text-align: center; }
  .footer-nav { justify-content: center; }

  .pub-card { flex-direction: column; gap: 10px; }
  .pub-year { min-width: auto; }

  .youtube-feature { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2.8rem; }
  .hero-portrait-wrap { width: 200px; }
}

/* ==========================================
   ANIMATIONS
   ========================================== */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb { background: var(--c-surface2); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-text-dim); }

/* Selection */
::selection {
  background: rgba(78,205,196,0.25);
  color: var(--c-white);
}