/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  --bg-primary: #080808;
  --bg-secondary: #111111;
  --bg-card: rgba(18, 18, 18, 0.7);
  --bg-card-hover: rgba(28, 28, 28, 0.85);
  --accent: #c0c0c0;
  --accent-bright: #ffffff;
  --accent-dim: #888888;
  --accent-subtle: #444444;
  --accent-tag: #a0a0a0;
  --accent-gradient: linear-gradient(135deg, #d0d0d0, #888888);
  --accent-gradient-hot: linear-gradient(135deg, #ffffff, #999999);
  --text-primary: #f0f0f0;
  --text-secondary: #999999;
  --text-muted: #555555;
  --border-glow: rgba(255, 255, 255, 0.06);
  --border-glow-hover: rgba(255, 255, 255, 0.15);
  --glow-soft: 0 0 40px rgba(255, 255, 255, 0.06);
  --glow-hover: 0 0 30px rgba(255, 255, 255, 0.08), 0 0 60px rgba(255, 255, 255, 0.03);
  --font-en: 'Space Grotesk', sans-serif;
  --font-kr: 'Noto Sans KR', sans-serif;
  --nav-height: 70px;
  --container-max: 1100px;
  --transition-fast: 0.2s ease;
  --transition-med: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-en);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
}

body.kr {
  font-family: var(--font-kr);
}

::selection {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-bright);
}

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

/* ============================================
   Full-page 3D Background Canvas
   ============================================ */
#bgCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ============================================
   Node Labels (3D projected orbit labels)
   ============================================ */
#nodeLabels { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; overflow: hidden; }
.node-label { position: absolute; font-family: var(--font-en); font-size: 0.6rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent-dim); white-space: nowrap; opacity: 0; transition: opacity 0.6s ease; transform: translate(-50%, -50%); text-shadow: 0 0 8px rgba(0, 0, 0, 0.8); }
.node-label.visible { opacity: 0.7; }

/* ============================================
   Hero Ambient Glow Overlay
   ============================================ */
.hero-glow {
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 140%;
  height: 60%;
  background: radial-gradient(
    ellipse 70% 50% at 50% 0%,
    rgba(180, 200, 240, 0.07) 0%,
    rgba(140, 160, 210, 0.03) 35%,
    transparent 70%
  );
  z-index: 1;
  pointer-events: none;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

.section {
  padding: 120px 0;
  position: relative;
  z-index: 2;
  background: rgba(8, 8, 8, 0.55);
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 60px;
  text-align: center;
  position: relative;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.section-title::before {
  content: '';
  display: none;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 1px;
  background: var(--accent-gradient);
  margin: 16px auto 0;
}

.subsection-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-family: var(--font-en);
}

.subsection-title::before {
  content: '>';
  margin-right: 8px;
  opacity: 0.4;
}

/* ============================================
   Holographic Card Base
   ============================================ */
.holo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-med);
}

.holo-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.02),
    transparent
  );
  transition: left 0.6s ease;
  pointer-events: none;
}

.holo-card:hover::before {
  left: 100%;
}

.holo-card:hover {
  border-color: var(--border-glow-hover);
  background: var(--bg-card-hover);
}

/* ============================================
   Navigation
   ============================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(8, 8, 8, 0.2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  z-index: 1000;
  transition: all var(--transition-med);
}

#navbar.scrolled {
  background: rgba(8, 8, 8, 0.5);
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

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

.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.05em;
  font-family: var(--font-en);
}

.logo-bracket {
  color: var(--accent-dim);
  font-weight: 300;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: all var(--transition-fast);
  position: relative;
  font-family: var(--font-en);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-bright);
  transition: width var(--transition-med);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after {
  width: 100%;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

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

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  padding: 6px 14px;
  cursor: pointer;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  transition: all var(--transition-fast);
}

.lang-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.lang-option {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.lang-option.active {
  color: var(--accent-bright);
}

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

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  position: relative;
  overflow: hidden;
  padding: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 24px;
}

.hero-greeting {
  font-size: 0.9rem;
  color: #c8c8c8;
  font-weight: 500;
  margin-bottom: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

/* Glitch effect for name */
.hero-name {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 12px;
  color: var(--text-primary);
  position: relative;
}


.hero-title-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 16px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(0.85rem, 1.8vw, 1rem);
  color: #d0d0d0;
  font-weight: 400;
  letter-spacing: 0.05em;
}

.hero-tagline {
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  color: #f0f0f0;
  font-weight: 400;
  line-height: 1.6;
  margin-bottom: 36px;
}

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

.hero-cta {
  display: inline-block;
  padding: 14px 36px;
  background: var(--text-primary);
  border: none;
  border-radius: 8px;
  color: #080808;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: all var(--transition-med);
}

.hero-cta:hover {
  background: #ffffff;
  transform: translateY(-2px);
  color: #080808;
  box-shadow: 0 4px 30px rgba(255, 255, 255, 0.15);
}

.hero-cta-ghost {
  display: inline-block;
  padding: 14px 36px;
  border: 1px solid var(--border-glow-hover);
  border-radius: 8px;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: all var(--transition-med);
}

.hero-cta-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--accent-bright);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  opacity: 0;
  animation: fadeInUp 1s 2.5s forwards;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 1px solid var(--accent-dim);
  border-bottom: 1px solid var(--accent-dim);
  transform: rotate(45deg);
  animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: 1; }
  50% { transform: rotate(45deg) translateY(8px); opacity: 0.4; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateX(-50%) translateY(20px); }
  to { opacity: 0.6; transform: translateX(-50%) translateY(0); }
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 60px;
  align-items: start;
}

/* Photo with HUD corners */
.photo-frame {
  width: 220px;
  height: 220px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.03), transparent 70%);
  border-radius: 16px;
  overflow: visible;
}

.photo-img {
  width: 180px;
  height: 180px;
  border-radius: 12px;
  object-fit: cover;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.08));
}


.about-bio {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 36px;
  border-left: 2px solid rgba(255, 255, 255, 0.08);
  padding-left: 20px;
}

.about-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.fact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.fact-item:hover {
  border-color: rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
}

.fact-icon-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-dim);
  flex-shrink: 0;
  margin-top: 10px;
}

.fact-item strong {
  display: block;
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 2px;
  font-family: var(--font-en);
}

.fact-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.fact-item a {
  color: var(--accent);
}

/* ============================================
   Experience Timeline
   ============================================ */
.timeline {
  position: relative;
  padding-left: 48px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-dim), var(--accent-subtle), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 24px;
}

.timeline-marker {
  position: absolute;
  left: -48px;
  top: 22px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 1px solid var(--accent-dim);
  z-index: 1;
  transition: all var(--transition-med);
}

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

/* Active marker ping for current role */
.marker-ping {
  position: absolute;
  top: -4px;
  left: -4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  animation: ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes ping {
  75%, 100% { transform: scale(2); opacity: 0; }
}

.timeline-card {
  padding: 24px 28px;
}

.timeline-period {
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.08em;
  font-family: monospace;
}

.timeline-role {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 6px 0 4px;
  letter-spacing: -0.01em;
}

.timeline-company {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   Publications — Compact List
   ============================================ */
.pub-list {
  margin-bottom: 48px;
}

.pub-item {
  padding: 16px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

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

.pub-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 4px;
}

.pub-title a {
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

.pub-authors {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 4px;
}

.pub-venue-line {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.78rem;
}

.pub-venue {
  color: var(--accent-dim);
  font-style: italic;
}

.pub-year {
  color: var(--text-muted);
  font-family: monospace;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
}

.pub-dot {
  color: var(--text-muted);
  font-size: 0.5rem;
  line-height: 1;
}

.pub-link {
  color: var(--accent-dim);
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-en);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition-fast);
}

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

.pub-cite {
  color: var(--text-muted);
  font-size: 0.7rem;
  font-family: monospace;
  letter-spacing: 0.03em;
}

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

.project-card {
  padding: 28px;
  display: block;
  color: var(--text-primary);
}

.project-card:hover {
  transform: translateY(-4px);
  color: var(--text-primary);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.project-icon-svg {
  color: var(--accent-dim);
  opacity: 0.6;
}

.project-lang {
  font-size: 0.7rem;
  color: var(--accent-tag);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 3px 12px;
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-en);
}

.project-name {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.project-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   Seminars
   ============================================ */
.seminars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.seminar-card {
  padding: 28px;
  display: block;
  color: var(--text-primary);
  transition: all var(--transition-med);
}

.seminar-card:hover {
  transform: translateY(-4px);
  color: var(--text-primary);
}

.seminar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.seminar-host {
  font-size: 0.7rem;
  color: var(--accent-tag);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 3px 12px;
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-en);
}

.seminar-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: monospace;
  letter-spacing: 0.05em;
}

.seminar-name {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.seminar-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.seminar-footer {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.seminar-icon {
  color: var(--accent-dim);
  opacity: 0.5;
}

.seminar-file {
  font-size: 0.65rem;
  color: var(--accent-dim);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--font-en);
  opacity: 0.6;
}

/* ============================================
   Education
   ============================================ */
.edu-timeline {
  position: relative;
  padding-left: 48px;
  max-width: 600px;
  margin: 0 auto;
}

.edu-timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-dim), var(--accent-subtle), transparent);
}

.edu-item {
  position: relative;
  margin-bottom: 24px;
}

.edu-marker {
  position: absolute;
  left: -48px;
  top: 18px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 1px solid var(--accent-subtle);
}

.edu-card {
  padding: 24px 28px;
}

.edu-period {
  font-size: 0.75rem;
  color: var(--accent-dim);
  font-weight: 500;
  font-family: monospace;
  letter-spacing: 0.05em;
}

.edu-degree {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 6px 0 4px;
}

.edu-school {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.edu-detail {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ============================================
   Contact
   ============================================ */
#contact {
  text-align: center;
}

.contact-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
}

.contact-btn:hover {
  color: var(--accent-bright);
}

.contact-icon {
  font-size: 1.1rem;
}

.contact-icon-svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ============================================
   Footer
   ============================================ */
#footer {
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  position: relative;
  z-index: 2;
  background: rgba(8, 8, 8, 0.6);
}

#footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ============================================
   Publication Link Icons
   ============================================ */
.pub-link-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 8px;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  vertical-align: middle;
}

.pub-link-icon:hover {
  color: var(--accent-bright);
}

.pub-link-icon svg {
  width: 14px;
  height: 14px;
}

.scholar-link {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color .2s;
}
.scholar-link:hover {
  color: var(--accent);
}

/* ============================================
   Alternating Timeline (Experience & Seminars)
   ============================================ */
.alt-timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.alt-timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-dim), var(--accent-subtle), transparent);
}

.alt-year-label {
  position: relative;
  text-align: center;
  margin-bottom: 16px;
  z-index: 1;
}

.alt-year-label span {
  display: inline-block;
  background: var(--bg-primary);
  padding: 4px 16px;
  font-family: monospace;
  font-size: 0.75rem;
  color: var(--accent-dim);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  letter-spacing: 0.05em;
}

.alt-item {
  position: relative;
  display: flex;
  margin-bottom: 16px;
  width: 100%;
}

.alt-item::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 1px solid var(--accent-dim);
  transform: translateX(-50%);
  z-index: 1;
  transition: all var(--transition-med);
}

.alt-item:hover::before {
  background: var(--accent);
  border-color: var(--accent);
}

.alt-item.active::before {
  background: var(--accent);
  border-color: var(--accent);
}

.alt-item.active::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 14px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  transform: translateX(-50%);
  animation: ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
  z-index: 1;
}

.alt-item.alt-left {
  justify-content: flex-start;
}

.alt-item.alt-left .alt-card {
  text-align: right;
}

.alt-item.alt-right {
  justify-content: flex-end;
}

.alt-card {
  width: calc(50% - 32px);
  padding: 20px 24px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  transition: all var(--transition-med);
}

.alt-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
}

.alt-period {
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.08em;
  font-family: monospace;
}

.alt-role {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 4px 0 2px;
  letter-spacing: -0.01em;
}

.alt-company {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.alt-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Seminar timeline cards */
.alt-sem-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 4px;
}

.alt-sem-host {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(8, 8, 8, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    padding: 40px;
    transition: right var(--transition-med);
    border-left: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    font-size: 1rem;
  }

  .section {
    padding: 80px 0;
  }

  .section-title {
    font-size: 1.6rem;
    margin-bottom: 40px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }

  .about-photo {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .photo-frame {
    width: 180px;
    height: 180px;
  }

  .photo-img {
    width: 140px;
    height: 140px;
  }

  .about-bio {
    text-align: left;
  }

  .about-facts {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .timeline {
    padding-left: 32px;
  }

  .timeline-marker {
    left: -32px;
    width: 14px;
    height: 14px;
  }

  .timeline-card {
    padding: 20px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .seminars-grid {
    grid-template-columns: 1fr;
  }

  .alt-timeline::before {
    left: 8px;
  }

  .alt-year-label {
    text-align: left;
    padding-left: 28px;
  }

  .alt-item {
    justify-content: flex-start !important;
    padding-left: 36px;
  }

  .alt-item::before {
    left: 8px;
    transform: translateX(-50%);
  }

  .alt-item.active::after {
    left: 8px;
    transform: translateX(-50%);
  }

  .alt-item.alt-left .alt-card,
  .alt-item.alt-right .alt-card {
    text-align: left;
  }

  .alt-card {
    width: 100%;
  }

  .edu-timeline {
    padding-left: 32px;
  }

  .edu-marker {
    left: -32px;
    width: 14px;
    height: 14px;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .hero-name {
    font-size: 2.4rem;
  }

  .hero-title {
    font-size: 0.8rem;
  }

  .hero-tagline {
    font-size: 0.95rem;
  }

  .timeline-card {
    padding: 16px;
  }

  .pub-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .pub-if {
    float: none;
  }
}