/* ═══════════════════════════════════════════
   DESIGN TOKENS & ACADEMIC STYLE SYSTEM
   ═══════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Lora:ital,wght@0,400;0,500;0,600;1,400&family=Fira+Code:wght@400;500&display=swap');

:root {
  --accent:        #8c1d40; /* Prestigious Crimson/Oxblood */
  --accent-light:  #faf0f2; /* Soft rose-water wash */
  --accent-hover:  #5c0d24; /* Deepest burgundy */
  
  --bg:            #fdfcfb; /* Warm ivory paper-like background */
  --bg-card:       #ffffff; /* Clean card white */
  --bg-surface:    #f7f5f2; /* Subtle grey-cream surface */
  
  --text:          #1c1917; /* Warm stone charcoal */
  --text-muted:    #44403c; /* Secondary warm charcoal */
  --text-dim:      #78716c; /* Neutral muted stone */
  
  --border:        #e7e5e4; /* Fine warm hair-line border */
  --border-focus:  #a8a29e;
  
  --radius:        2px; /* Editorial minimal rounding */
  --radius-lg:     4px;
  
  --font-serif:    'Lora', Georgia, serif;
  --font-sans:     'Inter', -apple-system, sans-serif;
  --font-mono:     'Fira Code', monospace;
  
  --transition:    0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h:      72px;
  --max-w:         960px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ═══════════════════════════════════════════
   HEADER NAVIGATION
   ═══════════════════════════════════════════ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 100;
  background: rgba(253, 252, 251, 0.9); /* Warm ivory glassmorphic */
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 30px rgba(140, 29, 64, 0.015);
  transition: background var(--transition), box-shadow var(--transition);
}

.header__container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-link.active {
  color: var(--accent);
}

/* Social icon buttons (mobile drawer) */
.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition),
              background var(--transition), transform var(--transition);
}

.social-icon svg {
  width: 15px;
  height: 15px;
}

.social-icon:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-light);
  transform: translateY(-1.5px);
}

/* ═══════════════════════════════════════════
   MAIN CONTENT & SECTIONS
   ═══════════════════════════════════════════ */
.main-content {
  margin-top: var(--header-h);
  padding: 0 0 80px 0;
}

.section {
  padding: 80px 24px;
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.5vw, 28px);
  font-weight: 600;
  margin-bottom: 40px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 16px;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 0.5px;
  background: var(--border);
}

.accent { color: var(--accent); font-weight: 500; }

/* ═══════════════════════════════════════════
   CARD LAYOUTS (ACADEMIC VARIANT)
   ═══════════════════════════════════════════ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card:not(.about-bio):hover {
  border-color: rgba(140, 29, 64, 0.2);
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(140, 29, 64, 0.04);
}

/* ═══════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.btn:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px rgba(140, 29, 64, 0.15);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--accent);
  color: #ffffff;
}

.btn--primary:hover {
  background: var(--accent-hover);
}

.btn--ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}

.btn--ghost:hover {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

/* ═══════════════════════════════════════════
   HERO SECTION
   ═══════════════════════════════════════════ */
.hero-section {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: center;
  gap: 60px;
  min-height: calc(75vh - var(--header-h));
  padding-top: 40px;
  padding-bottom: 40px;
}

.hero-text {
  max-width: 580px;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 500;
}

.hero-heading {
  font-family: var(--font-serif);
  font-size: clamp(34px, 4.2vw, 48px);
  font-weight: 600;
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--text);
  letter-spacing: -0.5px;
}

.hero-role {
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.hero-affiliations {
  font-size: 14.5px;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 12px;
}

.hero-socials {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  margin-top: 22px;
}

.hero-social-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  transition: color var(--transition);
}

.hero-social-link svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

.hero-social-link:hover {
  color: var(--accent);
}

.hero-social-link--contact {
  color: var(--accent);
  padding-left: 20px;
  border-left: 1px solid var(--border);
}

.hero-social-link--contact:hover {
  color: var(--accent-hover);
}

.hero-photo-container {
  position: relative;
  width: 236px;
  height: 236px;
  display: flex;
  align-items: center;
  justify-content: center;
  justify-self: end;
}

.hero-photo-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px dashed var(--accent);
  opacity: 0.3;
  animation: rotateRing 20s linear infinite;
  pointer-events: none;
  z-index: 1;
}

.hero-photo {
  width: 216px;
  height: 216px;
  border-radius: 50%;
  background: var(--bg);
  border: 4px solid var(--bg);
  box-shadow: 0 8px 24px rgba(140, 29, 64, 0.08), 0 0 0 1px var(--border);
  overflow: hidden;
  position: relative;
  z-index: 2;
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 10%;
  filter: grayscale(10%);
  mix-blend-mode: multiply;
  transition: transform var(--transition), filter var(--transition);
}

.hero-photo-container:hover .hero-photo {
  transform: scale(1.02);
  box-shadow: 0 12px 32px rgba(140, 29, 64, 0.12), 0 0 0 1px var(--accent);
}

.hero-photo-container:hover .hero-photo img {
  filter: grayscale(0%);
  transform: scale(1.03);
}

.hero-photo-container:hover .hero-photo-ring {
  border-style: solid;
  opacity: 0.6;
}

@keyframes rotateRing {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ═══════════════════════════════════════════
   ABOUT & CHRONOLOGICAL ACADEMIC NEWS
   ═══════════════════════════════════════════ */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: start;
}

.about-bio {
  border: none;
  padding: 0;
}

.about-bio p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 14.5px;
  line-height: 1.7;
}

.about-bio p:last-child {
  margin-bottom: 0;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 20px;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 2px;
  font-size: 11.5px;
  font-weight: 500;
  border: 1px solid transparent;
}

/* News Feed Container */
.news-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.news-container h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 8px;
}

.news-feed {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: 380px;
  overflow-y: auto;
  padding-right: 8px;
}

/* Custom Scrollbar for News Feed */
.news-feed::-webkit-scrollbar { width: 4px; }
.news-feed::-webkit-scrollbar-track { background: transparent; }
.news-feed::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.news-item {
  display: flex;
  gap: 12px;
  font-size: 13.5px;
  line-height: 1.5;
  align-items: start;
  transition: transform var(--transition), background-color var(--transition);
  padding: 6px 8px;
  margin-left: -8px;
  margin-right: -8px;
  border-radius: var(--radius);
}

.news-item:hover {
  transform: translateX(4px);
  background-color: var(--accent-light);
}

/* Interests List & Headings */
.interests-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text);
}

.interests-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
}

.interests-item {
  display: flex;
  gap: 8px;
  align-items: start;
}

.interests-item span {
  line-height: 1.5;
}

.sub-section-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  margin: 56px 0 20px;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.news-date {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--accent);
  font-weight: 500;
  min-width: 72px;
  flex-shrink: 0;
  text-transform: uppercase;
}

.news-text {
  color: var(--text-muted);
}

.news-text strong {
  color: var(--text);
}

/* ═══════════════════════════════════════════
   TECHNICAL EXPERTISE GRID
   ═══════════════════════════════════════════ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.skill-group__title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  padding: 4px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 12.5px;
  color: var(--text-muted);
  transition: transform var(--transition), border-color var(--transition), color var(--transition), background var(--transition), box-shadow var(--transition);
}

.pill:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(140, 29, 64, 0.05);
}

/* ═══════════════════════════════════════════
   SCHOLARLY PUBLICATIONS & PREPRINTS (CV STYLE)
   ═══════════════════════════════════════════ */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.pub-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  margin-left: -20px;
  margin-right: -20px;
  border-bottom: 1px solid var(--border);
  border-left: 3px solid transparent;
  border-radius: var(--radius);
  transition: border-left-color var(--transition), padding-left var(--transition), background var(--transition);
}

.pub-item:last-child {
  border-bottom: none;
}

.pub-item:hover {
  border-left-color: var(--accent);
  background: var(--accent-light);
  padding-left: 28px;
}

.pub-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.pub-type {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent);
  background: var(--accent-light);
  padding: 1px 6px;
  border-radius: 2px;
}

.pub-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  transition: color var(--transition);
}

.pub-title:hover {
  color: var(--accent);
}

.pub-authors {
  font-size: 14px;
  color: var(--text-muted);
}

.pub-authors strong {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

.pub-venue {
  font-size: 13.5px;
  color: var(--text-dim);
  font-style: italic;
}

.pub-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
  background: var(--bg-surface);
  border-left: 2px solid var(--border);
  padding: 10px 14px;
  margin: 4px 0;
  transition: border-color var(--transition), background var(--transition);
}

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

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.pub-link-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  border: 1px dashed var(--border);
  padding: 2px 8px;
  border-radius: 2px;
  transition: transform var(--transition), color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.pub-link-badge:hover {
  color: #ffffff;
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(140, 29, 64, 0.1);
}

/* ═══════════════════════════════════════════
   COMPACT SOFTWARE & SYSTEMS GRID
   ═══════════════════════════════════════════ */
.software-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.software-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.software-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.software-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.software-links {
  display: flex;
  gap: 8px;
}

.software-link {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  transition: color var(--transition);
}

.software-link:hover {
  color: var(--accent);
}

.software-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.55;
  flex: 1;
}

/* ═══════════════════════════════════════════
   VERTICAL TIMELINE (Experience & Education)
   ═══════════════════════════════════════════ */
.timeline {
  position: relative;
  padding-left: 20px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
}

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

.timeline-dot {
  position: absolute;
  left: -24px; top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.timeline-item:hover .timeline-dot {
  transform: scale(1.3);
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(140, 29, 64, 0.15);
}

.timeline-content {
  border: none;
  padding: 0 0 0 12px;
  background: transparent;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform var(--transition);
}

.timeline-item:hover .timeline-content {
  transform: translateX(4px);
}

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

.timeline-role {
  font-family: var(--font-serif);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--text);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

.timeline-org {
  font-size: 13.5px;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 4px;
}

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

.timeline-desc {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.timeline-tags .tag {
  font-size: 11px;
  padding: 2px 8px;
  background: var(--bg-surface);
  color: var(--text-muted);
  border: none;
}

/* ═══════════════════════════════════════════
   CONTACT & SCHOLARLY INQUIRIES
   ═══════════════════════════════════════════ */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: start;
}

.contact-intro {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.65;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.contact-item:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  transform: translateX(2px);
}

.contact-icon {
  font-size: 18px;
  color: var(--accent);
  font-family: var(--font-serif);
  font-weight: 600;
  width: 24px;
  text-align: center;
}

.contact-label {
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  color: var(--text-dim);
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.contact-value {
  display: block;
  font-size: 13.5px;
  color: var(--text);
  font-weight: 500;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text);
  background: var(--bg-card);
  outline: none;
  transition: border-color var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(140, 29, 64, 0.08);
}

/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */
.footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13.5px;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  transition: color var(--transition);
}

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

/* ═══════════════════════════════════════════
   MOBILE HEADER & OVERLAY DRAWER
   ═══════════════════════════════════════════ */
.mobile-header {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 64px;
  padding: 0 20px;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 200;
}

.mobile-header .header__logo {
  font-size: 19px;
}

.hamburger {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  transition: all var(--transition);
}

.hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.25);
  z-index: 99;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.sidebar-backdrop.is-open {
  display: block;
}

/* Desktop layout setting for hidden sidebar menu by default */
.sidebar {
  display: none;
}

/* ═══════════════════════════════════════════
   REVEAL & ENTRANCE ANIMATIONS
   ═══════════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1), transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.hero-stagger {
  opacity: 0;
  transform: translateY(8px);
  animation: heroEntrance 0.7s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.hero-stagger:nth-child(1) { animation-delay: 0.05s; }
.hero-stagger:nth-child(2) { animation-delay: 0.1s; }
.hero-stagger:nth-child(3) { animation-delay: 0.15s; }
.hero-stagger:nth-child(4) { animation-delay: 0.2s; }

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

/* ═══════════════════════════════════════════
   RESPONSIVE MEDIA QUERIES
   ═══════════════════════════════════════════ */
@media (max-width: 900px) {
  .hero-social-link--contact {
    padding-left: 0;
    border-left: none;
  }
}

@media (max-width: 1024px) {
  .section {
    padding: 60px 24px;
  }
  .hero-section {
    gap: 40px;
  }
  .pub-item {
    gap: 10px;
  }
}

@media (max-width: 768px) {
  .header {
    display: none;
  }
  
  .mobile-header {
    display: flex;
  }
  
  .main-content {
    margin-top: 64px;
  }
  
  .sidebar {
    display: flex;
    position: fixed;
    top: 64px; right: 0; bottom: 0;
    width: 280px;
    background: var(--bg-card);
    border-left: 1px solid var(--border);
    box-shadow: -10px 0 30px rgba(15, 23, 42, 0.04);
    z-index: 150;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-direction: column;
    padding: 32px 24px;
    gap: 32px;
  }
  
  .sidebar.is-open {
    transform: translateX(0);
  }
  
  .sidebar__links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  
  .sidebar__links .nav-link {
    font-size: 16px;
    padding: 8px 0;
    display: block;
  }
  
  .sidebar__socials {
    display: flex;
    gap: 12px;
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding-top: 24px;
  }
  
  /* Sections stack responsive */
  .hero-section {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
    padding-top: 20px;
    gap: 32px;
    min-height: auto;
  }
  
  .hero-text {
    order: 2;
  }
  
  .hero-photo-container {
    order: 1;
    justify-self: center;
    width: 190px;
    height: 190px;
  }
  
  .hero-photo {
    width: 170px;
    height: 170px;
  }
  
  .hero-cta {
    justify-content: center;
  }

  .hero-socials {
    justify-content: center;
    gap: 10px 16px;
  }

  .hero-social-link--contact {
    padding-left: 0;
    border-left: none;
    width: 100%;
    justify-content: center;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .software-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer {
    flex-direction: column;
    gap: 16px;
    text-align: center;
    padding: 32px 24px;
  }
}

@media (max-width: 480px) {
  .hero-heading {
    font-size: 30px;
  }
  
  .hero-cta {
    flex-direction: column;
    gap: 12px;
    width: 100%;
  }
  
  .hero-cta .btn {
    width: 100%;
  }
}