/* ==========================================================================
   DR. PA PA WIN AUNG - ACADEMIC PORTFOLIO
   Theme: Gallery White & Champagne Platinum (Light Luxury Tech)
   ========================================================================== */

:root {
  /* Surface Foundations */
  --bg-base: #fbfbfd;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-glass: rgba(255, 255, 255, 0.82);
  --bg-subtle: #f4f5f8;

  /* Champagne Platinum Metallic Accents */
  --champagne: #8c7355;        /* Brushed Champagne Platinum */
  --champagne-gold: #a38258;
  --champagne-light: #f6f2ec;
  --champagne-dim: rgba(140, 115, 85, 0.12);
  --champagne-glow: rgba(140, 115, 85, 0.25);

  /* High-Contrast Typography */
  --text-title: #09090b;        /* Jet Pitch Black */
  --text-body: #334155;         /* Deep Slate Charcoal */
  --text-muted: #64748b;        /* Medium Slate Zinc */
  --text-light: #94a3b8;

  /* Hairlines & Borders */
  --border-hairline: rgba(0, 0, 0, 0.08);
  --border-card: rgba(0, 0, 0, 0.06);
  --border-active: rgba(140, 115, 85, 0.45);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.06), 0 2px 6px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 20px 45px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.03);

  /* Precision Geometry */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-base);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-body);
  background-color: var(--bg-base);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* 3D Digital Twin Background Canvas */
#digitalTwinCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.95;
}

/* Subtle Luminous Vignette */
.vignette-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 30%, rgba(251, 251, 253, 0.05) 0%, rgba(251, 251, 253, 0.55) 75%, rgba(251, 251, 253, 0.85) 100%);
  pointer-events: none;
  z-index: 1;
}

.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* Navigation */
.site-nav {
  position: sticky;
  top: 18px;
  z-index: 100;
  margin: 0 auto 28px;
  max-width: 1220px;
  padding: 0 24px;
}

.nav-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-full);
  padding: 10px 24px;
  box-shadow: var(--shadow-md);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-title);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.nav-brand-text {
  white-space: nowrap;
}

.nav-avatar-mini {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--champagne);
  flex-shrink: 0;
}

/* Breadcrumb Navigation (< 1024px) */
.breadcrumb-container {
  display: none; /* Shown under 1024px via media query */
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
}

.breadcrumb-root {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-title);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
  transition: var(--transition);
}

.breadcrumb-root:hover {
  color: var(--champagne-dark);
}

.breadcrumb-name {
  white-space: nowrap;
}

.breadcrumb-divider {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 300;
  user-select: none;
}

.breadcrumb-current-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--champagne);
  border-radius: var(--radius-full);
  padding: 0 14px;
  height: 36px;
  box-sizing: border-box;
  cursor: pointer;
  color: var(--champagne-dark);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.86rem;
  letter-spacing: 0.01em;
  transition: var(--transition);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
  max-width: 180px;
}

.breadcrumb-current-btn:hover,
.breadcrumb-current-btn.open {
  background: var(--champagne-light);
  border-color: var(--champagne-dark);
  transform: translateY(-1px);
}

.breadcrumb-current-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.breadcrumb-chevron {
  flex-shrink: 0;
  transition: transform 0.25s ease;
  color: var(--champagne-dark);
}

.breadcrumb-current-btn.open .breadcrumb-chevron {
  transform: rotate(180deg);
}

/* Nav Options Dropdown (< 1024px) */
.nav-options-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 24px;
  right: 24px;
  max-width: 520px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  border: 1px solid var(--border-hairline);
  border-radius: 20px;
  box-shadow: 0 20px 48px -12px rgba(0, 0, 0, 0.18), 0 0 0 1px rgba(212, 175, 55, 0.12);
  overflow: hidden;
  z-index: 120;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.98);
  transition: opacity 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.22s;
  pointer-events: none;
}

.nav-options-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.dropdown-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-hairline);
  background: rgba(248, 246, 240, 0.6);
}

.dropdown-header-title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--champagne-dark);
}

.dropdown-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0 4px;
  border-radius: 6px;
  transition: var(--transition);
}

.dropdown-close-btn:hover {
  color: var(--text-title);
  background: rgba(0, 0, 0, 0.05);
}

.dropdown-body {
  padding: 10px 14px 16px;
  max-height: calc(85vh - 120px);
  overflow-y: auto;
}

.dropdown-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding: 0;
}

.dropdown-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 14px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-body);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.dropdown-nav-item:hover {
  background: var(--champagne-light);
  color: var(--text-title);
  transform: translateX(3px);
}

.dropdown-nav-item.active {
  background: rgba(212, 175, 55, 0.12);
  color: var(--champagne-dark);
  font-weight: 600;
}

.nav-index {
  font-family: 'Space Grotesk', var(--font-mono, monospace);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--champagne-dark);
  background: rgba(212, 175, 55, 0.15);
  padding: 2px 7px;
  border-radius: 6px;
  min-width: 26px;
  text-align: center;
}

.nav-title {
  flex: 1;
}

.nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: transparent;
  transition: var(--transition);
}

.dropdown-nav-item.active .nav-dot {
  background: var(--champagne);
  box-shadow: 0 0 8px var(--champagne);
}

.dropdown-footer {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-hairline);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

.nav-dropdown-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 18, 20, 0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 95;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s ease, visibility 0.22s;
}

.nav-dropdown-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.88rem;
  transition: var(--transition);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-title);
  background-color: var(--champagne-light);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  font-family: inherit;
}

.btn-primary {
  background: #09090b;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
  font-weight: 600;
}

.btn-primary:hover {
  background: #18181b;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.22);
  color: #ffffff;
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-title);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--champagne-light);
  border-color: var(--border-active);
  color: var(--champagne);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

/* Hero Section */
.hero-section {
  padding: 40px 0 60px;
}

.hero-card {
  background: var(--bg-card);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(140, 115, 85, 0.08), transparent 70%);
  pointer-events: none;
}

.hero-avatar-wrap {
  text-align: center;
}

.hero-avatar-ring {
  width: 220px;
  height: 220px;
  margin: 0 auto;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, #09090b, var(--champagne), #e2dbd2);
  box-shadow: var(--shadow-md);
}

.hero-avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: #ffffff;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: #ffffff;
  border: 1px solid var(--border-hairline);
  color: var(--champagne);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-top: 16px;
  box-shadow: var(--shadow-sm);
}

.status-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.hero-title-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.hero-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Technical Monospace Chips */
.pill-tag {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.06em;
  background: #ffffff;
  color: var(--text-title);
  border: 1px solid var(--border-hairline);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.pill-tag-gold {
  background: var(--champagne-light);
  color: var(--champagne-gold);
  border-color: rgba(140, 115, 85, 0.3);
}

.pill-tag-purple {
  background: #f1f5f9;
  color: var(--text-body);
}

.hero-name {
  font-size: 2.9rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-title);
  line-height: 1.15;
}

.hero-korean-name {
  font-size: 1.25rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 8px;
}

.hero-role {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--champagne);
  letter-spacing: -0.01em;
}

.hero-institution {
  font-size: 0.94rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.hero-bio {
  font-size: 1.02rem;
  color: var(--text-body);
  line-height: 1.7;
  margin: 6px 0 12px;
}

.hero-contact-row {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.hero-contact-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--text-muted);
  font-size: 0.88rem;
  text-decoration: none;
  transition: var(--transition);
}

.hero-contact-item:hover {
  color: var(--text-title);
}

/* Metrics Banner */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 32px;
}

.metric-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.metric-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-active);
}

.metric-icon-box {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  background: var(--champagne-light);
  color: var(--champagne);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  border: 1px solid rgba(140, 115, 85, 0.2);
}

.metric-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1.1;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Section Common */
.section {
  padding: 64px 0;
}

.section-header {
  margin-bottom: 36px;
}

.section-pretitle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--champagne);
  margin-bottom: 8px;
  font-family: ui-monospace, monospace;
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-title);
}

.section-subtitle {
  font-size: 0.98rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-top: 6px;
}

/* Research Focus Cards */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.research-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-active);
}

.research-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 10px;
}

.research-card p {
  color: var(--text-body);
  font-size: 0.92rem;
  line-height: 1.65;
  margin-bottom: 18px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  background: var(--bg-subtle);
  color: var(--text-body);
  font-size: 0.76rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-hairline);
  transition: var(--transition);
}

.skill-tag:hover {
  border-color: var(--champagne);
  color: var(--text-title);
}

/* Publications Hub */
.pub-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-sm);
}

.pub-filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pub-tab {
  background: transparent;
  border: none;
  padding: 7px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.pub-tab:hover {
  color: var(--text-title);
  background: var(--champagne-light);
}

.pub-tab.active {
  background: #09090b;
  color: #ffffff;
  font-weight: 700;
}

.pub-search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.02);
}

.pub-search-box input {
  border: none;
  background: transparent;
  font-size: 0.86rem;
  outline: none;
  color: var(--text-title);
  width: 180px;
  font-family: inherit;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pub-card {
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
}

.pub-card:hover {
  border-color: var(--border-active);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.pub-card.highlight {
  border-left: 3px solid var(--champagne-gold);
}

.pub-meta-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.pub-badge-type {
  font-family: ui-monospace, monospace;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
}

.badge-scie {
  background: var(--champagne-light);
  color: var(--champagne);
  border: 1px solid rgba(140, 115, 85, 0.3);
}

.badge-kci {
  background: #eff6ff;
  color: #1d4ed8;
  border: 1px solid #bfdbfe;
}

.badge-conf {
  background: #f8fafc;
  color: var(--text-title);
  border: 1px solid var(--border-hairline);
}

.badge-first-author {
  background: #09090b;
  color: #ffffff;
  font-weight: 700;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.pub-year {
  font-size: 0.82rem;
  font-family: ui-monospace, monospace;
  color: var(--text-muted);
}

.pub-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.4;
  margin-bottom: 6px;
}

.pub-authors {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.author-highlight {
  color: var(--text-title);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--champagne);
  text-underline-offset: 3px;
}

.pub-venue {
  font-size: 0.88rem;
  font-style: italic;
  color: var(--text-body);
  margin-bottom: 14px;
}

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

/* Patents Showcase */
.patents-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.patent-card {
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.patent-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-active);
}

.patent-card.featured {
  border-top: 3px solid var(--champagne-gold);
}

.patent-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: ui-monospace, monospace;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  width: fit-content;
}

.status-registered {
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
}

.status-pending {
  background: #fffbeb;
  color: #d97706;
  border: 1px solid #fde68a;
}

.status-award {
  background: var(--champagne-light);
  color: var(--champagne-gold);
  border: 1px solid rgba(140, 115, 85, 0.35);
}

.patent-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.45;
  margin-bottom: 10px;
}

.patent-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: ui-monospace, monospace;
  margin-bottom: 12px;
}

.patent-desc {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 18px;
}

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

.award-item {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.award-item:hover {
  border-color: var(--border-active);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.award-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--champagne-light);
  color: var(--champagne);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  border: 1px solid rgba(140, 115, 85, 0.2);
  flex-shrink: 0;
}

.award-content h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 4px;
}

.award-org {
  font-size: 0.82rem;
  color: var(--champagne);
  font-weight: 600;
  margin-bottom: 6px;
}

.award-desc {
  font-size: 0.86rem;
  color: var(--text-body);
  line-height: 1.5;
}

/* Timeline */
.timeline-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

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

.timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--champagne), rgba(0, 0, 0, 0.08));
}

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

.timeline-dot {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ffffff;
  border: 2px solid #09090b;
  box-shadow: 0 0 0 4px var(--champagne-light);
}

.timeline-time {
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--champagne);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.timeline-role {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 4px;
}

.timeline-org {
  font-size: 0.92rem;
  color: var(--text-body);
  font-weight: 500;
  margin-bottom: 8px;
}

.timeline-details {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.timeline-details ul {
  padding-left: 18px;
  margin-top: 6px;
}

/* Skills */
.skills-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.skill-category {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.skill-cat-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skill-row {
  margin-bottom: 14px;
}

.skill-row:last-child {
  margin-bottom: 0;
}

.skill-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-title);
  margin-bottom: 6px;
}

.skill-bar-track {
  width: 100%;
  height: 6px;
  background: var(--bg-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, #09090b, var(--champagne));
  transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Videos / Portfolio */
.videos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.video-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-active);
}

.video-thumb {
  height: 190px;
  background: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-hairline);
}

.video-poster-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 1;
  transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1), filter 0.35s ease;
  background-color: #f1f5f9;
}

.video-card:hover .video-poster-img {
  transform: scale(1.06);
  filter: brightness(1.03);
}

.video-card-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 3;
  padding: 4px 10px;
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: rgba(15, 23, 42, 0.78);
  color: #f8fafc;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  pointer-events: none;
}

.video-thumb-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(9, 9, 11, 0.35) 0%, rgba(9, 9, 11, 0.05) 60%);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.25s ease;
  z-index: 2;
}

.video-card:hover .video-thumb-overlay {
  background: linear-gradient(to top, rgba(9, 9, 11, 0.5) 0%, rgba(9, 9, 11, 0.15) 60%);
}

.video-play-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  color: #09090b;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
  transition: var(--transition);
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.video-card:hover .video-play-btn {
  transform: scale(1.14);
  background: #09090b;
  color: #ffffff;
}

.video-info {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.video-cat {
  font-family: ui-monospace, monospace;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--champagne);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.video-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 6px;
}

.video-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
}

/* Video & PDF Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 24px;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 900px;
  width: 100%;
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
  position: relative;
  transform: translateY(20px) scale(0.96);
  transition: transform 0.3s ease;
}

.modal-backdrop.active .modal-dialog {
  transform: translateY(0) scale(1);
}

.modal-header {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-hairline);
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-title);
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 4px;
  border-radius: 50%;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--text-title);
  background: var(--bg-subtle);
}

.modal-body {
  padding: 0;
  background: #000000;
}

.modal-video-player {
  width: 100%;
  max-height: 520px;
  display: block;
}

/* Contact Modal Styles */
.contact-modal-dialog {
  max-width: 480px;
  background: #ffffff;
}

.contact-modal-body {
  padding: 24px;
  background: #ffffff;
}

.contact-modal-intro {
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 16px;
}

.contact-modal-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.contact-modal-korean {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}

.contact-modal-affil {
  font-size: 0.85rem;
  color: var(--text-body);
  line-height: 1.45;
}

.contact-card-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.contact-card-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  transition: var(--transition);
}

.contact-card-item:hover {
  border-color: var(--champagne-gold);
  background: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.contact-card-info {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.contact-card-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--champagne-gold);
  flex-shrink: 0;
}

.contact-card-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.contact-card-val {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-title);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.contact-card-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.btn-copy {
  padding: 5px 10px;
  font-size: 0.76rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
  background: #ffffff;
  color: var(--text-title);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
}

.btn-copy:hover {
  border-color: var(--champagne-gold);
  color: var(--champagne-gold);
}

.btn-copy.btn-action-link {
  background: #f8fafc;
}

.btn-copy.btn-action-link:hover {
  background: var(--champagne-light);
  border-color: var(--champagne-gold);
  color: var(--champagne-gold);
}

.btn-copy.copied {
  background: #10b981;
  color: #ffffff;
  border-color: #10b981;
}

.contact-modal-profiles {
  display: flex;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-hairline);
  flex-wrap: wrap;
}

.contact-profile-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-body);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  transition: var(--transition);
}

.contact-profile-link:hover {
  color: var(--champagne-gold);
  border-color: var(--champagne-gold);
  background: #ffffff;
}

/* Toast */
.toast-msg {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #09090b;
  color: #ffffff;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  font-weight: 600;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast-msg.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Clean Minimal Footer */
.site-footer {
  padding: 56px 0 40px;
  border-top: 1px solid var(--border-hairline);
  margin-top: 80px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.86rem;
  letter-spacing: 0.02em;
}

/* Responsive Navigation Breakpoints (Strict 1024px) */
@media (min-width: 1024px) {
  .nav-brand {
    display: flex !important;
  }
  .nav-links {
    display: flex !important;
  }
  .nav-actions {
    display: flex !important;
  }
  .breadcrumb-container {
    display: none !important;
  }
  .nav-options-dropdown {
    display: none !important;
  }
  .nav-dropdown-backdrop {
    display: none !important;
  }
}

@media (max-width: 1023.98px) {
  .site-nav {
    top: 18px;
    margin-bottom: 28px;
    padding: 0 24px;
  }
  .nav-pill {
    padding: 10px 24px;
    min-height: 54px;
    gap: 12px;
  }
  .nav-brand {
    display: none !important;
  }
  .nav-links {
    display: none !important;
  }
  .nav-actions {
    display: none !important; /* Hamburger and Contact buttons removed under 1024px */
  }
  .breadcrumb-container {
    display: flex !important;
    width: 100%;
  }
  .hero-card {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 32px;
  }
  .hero-avatar-wrap {
    margin: 0 auto;
  }
  .hero-title-area {
    align-items: center;
  }
  .hero-institution, .hero-contact-row {
    justify-content: center;
  }
  .patents-grid, .videos-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .timeline-cols, .skills-container {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-card {
    padding: 28px 20px;
  }
  .hero-name {
    font-size: 2.1rem;
  }
  .research-grid, .patents-grid, .videos-grid, .awards-grid {
    grid-template-columns: 1fr;
  }
  .metrics-row {
    grid-template-columns: 1fr;
  }
  .pub-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .pub-search-box input {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .site-nav {
    padding: 0 16px;
  }
  .nav-pill {
    padding: 10px 18px;
    min-height: 54px;
    gap: 8px;
  }
  .breadcrumb-name {
    max-width: 125px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.88rem;
  }
  .breadcrumb-current-btn {
    max-width: 120px;
    font-size: 0.84rem;
  }
  .nav-contact-btn {
    display: none !important; /* Kept inside Navigation Options dropdown for compact header */
  }
}