/* ==========================================================================
   Muhammad Moeeze Hassan — Portfolio & Academic Homepage
   Design System: Computational Precision & Academic Editorial
   ========================================================================== */

:root {
  /* Fonts */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Newsreader', Georgia, Cambria, serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Dark Theme Palette (Default) */
  --bg-primary: #070a11;
  --bg-secondary: #0d131f;
  --bg-tertiary: #131c2d;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(22, 33, 58, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(56, 189, 248, 0.4);
  --border-glow: rgba(56, 189, 248, 0.15);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-cyan: #38bdf8;
  --accent-cyan-hover: #7dd3fc;
  --accent-cyan-bg: rgba(56, 189, 248, 0.12);

  --accent-amber: #f59e0b;
  --accent-amber-bg: rgba(245, 158, 11, 0.12);

  --accent-emerald: #10b981;
  --accent-emerald-bg: rgba(16, 185, 129, 0.12);

  --header-bg: rgba(7, 10, 17, 0.82);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 0 1px 1px rgba(255, 255, 255, 0.05);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(255, 255, 255, 1);

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-active: rgba(2, 132, 199, 0.5);
  --border-glow: rgba(2, 132, 199, 0.15);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --accent-cyan: #0284c7;
  --accent-cyan-hover: #0369a1;
  --accent-cyan-bg: rgba(2, 132, 199, 0.08);

  --accent-amber: #d97706;
  --accent-amber-bg: rgba(217, 119, 6, 0.08);

  --accent-emerald: #059669;
  --accent-emerald-bg: rgba(5, 150, 105, 0.08);

  --header-bg: rgba(248, 250, 252, 0.85);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08), 0 0 1px 1px rgba(0, 0, 0, 0.05);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Background Atmosphere */
.bg-glow {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  background: 
    radial-gradient(circle at 15% 15%, rgba(56, 189, 248, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 85% 35%, rgba(245, 158, 11, 0.03) 0%, transparent 45%),
    radial-gradient(circle at 50% 85%, rgba(16, 185, 129, 0.03) 0%, transparent 50%);
}

.physics-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;
  z-index: 1;
  opacity: 0.75;
  transition: opacity var(--transition-normal);
}

main, header, footer {
  position: relative;
  z-index: 2;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
}

code, pre {
  font-family: var(--font-mono);
}

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

/* ==========================================================================
   Header & Nav
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-monogram {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-active);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: 0 0 15px var(--border-glow);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.brand-role {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width var(--transition-fast);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--border-active);
  background: var(--bg-tertiary);
}

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

.mobile-toggle {
  display: none;
}

/* ==========================================================================
   Buttons & Badges
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
}

.btn-primary {
  background: var(--accent-cyan);
  color: #070a11;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  background: var(--accent-cyan-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.35);
}

.btn-secondary {
  background: var(--bg-secondary);
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary:hover {
  border-color: var(--border-active);
  background: var(--bg-tertiary);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

.btn-outline:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.btn-ghost {
  background: var(--bg-secondary);
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
  border-color: var(--border-active);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-mono);
  border-radius: var(--radius-full);
}

.badge-primary {
  background: var(--accent-cyan-bg);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.badge-accent {
  background: var(--accent-amber-bg);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.badge-success {
  background: var(--accent-emerald-bg);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  padding: 4.5rem 0 3.5rem;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 3.5rem;
  align-items: center;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  margin-bottom: 1.25rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse 2.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(2.5rem, 4.5vw, 3.6rem);
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  line-height: 1.15;
}

.gradient-text {
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 650px;
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

.hero-lead em {
  color: var(--text-primary);
  font-size: 1.25rem;
}

.hero-affiliations {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  padding: 0.85rem 1.15rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  font-size: 0.825rem;
}

.affiliation-item {
  display: flex;
  flex-direction: column;
}

.affil-org {
  font-weight: 700;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

.affil-desc {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.affiliation-divider {
  color: var(--border-subtle);
  font-weight: 300;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 2.5rem;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
}

.metric-card {
  display: flex;
  flex-direction: column;
}

.metric-val {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.metric-val small {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.metric-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.35;
  margin-top: 0.15rem;
}

/* Avatar Card */
.avatar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.avatar-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-active);
}

.avatar-frame {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000;
  aspect-ratio: 3/4;
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
  display: block;
  filter: contrast(1.05);
}

.avatar-badge {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  background: rgba(7, 10, 17, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-primary);
}

.avatar-caption {
  margin-top: 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.avatar-caption strong {
  font-size: 1.05rem;
}

.avatar-caption span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.social-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-subtle);
}

.social-link {
  width: 2.1rem;
  height: 2.1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-link:hover {
  color: var(--accent-cyan);
  border-color: var(--border-active);
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

/* ==========================================================================
   Section Layouts
   ========================================================================== */

.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-darker {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: 3rem;
  max-width: 720px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
  margin-bottom: 0.85rem;
}

.section-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   Research Thrusts
   ========================================================================== */

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

.thrust-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.thrust-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-active);
  box-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.4), 0 0 20px var(--border-glow);
}

.thrust-icon {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.thrust-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.thrust-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.thrust-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

/* ==========================================================================
   Publications
   ========================================================================== */

.featured-pub-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  margin-bottom: 2.5rem;
  transition: border-color var(--transition-normal);
}

.featured-pub-card:hover {
  border-color: var(--border-active);
}

.pub-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.pub-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.25rem;
  align-items: start;
}

.pub-title {
  font-size: 1.45rem;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

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

.pub-authors {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

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

.pub-authors a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.pub-authors a:hover {
  color: var(--text-primary);
}

.pub-meta-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 1.25rem;
}

.meta-journal {
  color: var(--accent-amber);
  font-weight: 600;
}

.meta-dot {
  color: var(--border-subtle);
}

.pub-abstract {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.pub-links-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.pub-figure-wrapper {
  display: flex;
  flex-direction: column;
}

.figure-frame {
  position: relative;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.pub-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.figure-frame:hover .pub-img {
  transform: scale(1.03);
}

.figure-overlay {
  padding: 0.5rem 0.75rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-align: center;
}

/* BibTeX Dropdown */
.bibtex-block {
  display: none;
  margin-top: 1.25rem;
  background: #000;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem;
  overflow-x: auto;
}

.bibtex-block.open {
  display: block;
}

.bibtex-block pre {
  margin: 0;
  font-size: 0.75rem;
  color: #38bdf8;
  line-height: 1.5;
}

/* Conference List */
.conf-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.conf-item {
  display: flex;
  gap: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
}

.conf-icon {
  font-size: 1.5rem;
}

.conf-body {
  flex-grow: 1;
}

.conf-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.conf-title {
  font-size: 1rem;
  line-height: 1.35;
}

.conf-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--accent-amber-bg);
  color: var(--accent-amber);
  white-space: nowrap;
}

.conf-authors {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 0.5rem;
}

.conf-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.conf-link {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.conf-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Engineering Projects
   ========================================================================== */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.filter-btn.active {
  background: var(--accent-cyan-bg);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  font-weight: 600;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-active);
  box-shadow: 0 16px 35px -10px rgba(0, 0, 0, 0.4), 0 0 15px var(--border-glow);
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.proj-icon {
  font-size: 1.5rem;
}

.card-badges {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.lang-badge {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.lang-badge.python { color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.25); }
.lang-badge.ts { color: #60a5fa; border: 1px solid rgba(96, 165, 250, 0.25); }
.lang-badge.kotlin { color: #c084fc; border: 1px solid rgba(192, 132, 252, 0.25); }
.lang-badge.c { color: #f43f5e; border: 1px solid rgba(244, 63, 94, 0.25); }
.lang-badge.acpi { color: #fbbf24; border: 1px solid rgba(251, 191, 36, 0.25); }
.lang-badge.matlab { color: #fb923c; border: 1px solid rgba(251, 146, 60, 0.25); }
.lang-badge.robotics { color: #34d399; border: 1px solid rgba(52, 211, 153, 0.25); }

.star-badge {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.highlight-star {
  background: var(--accent-amber-bg);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
  font-weight: 700;
}

.proj-title {
  font-size: 1.15rem;
  margin-bottom: 0.65rem;
  line-height: 1.35;
}

.proj-title a:hover {
  color: var(--accent-cyan);
}

.proj-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.proj-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.meta-tag {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-muted);
}

.proj-foot {
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.78rem;
}

.proj-link {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.proj-link:hover {
  text-decoration: underline;
}

.proj-status {
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Academic Trajectory & Timeline
   ========================================================================== */

.timeline {
  position: relative;
  max-width: 820px;
  margin-left: 1.5rem;
  border-left: 2px solid var(--border-subtle);
  padding-left: 2rem;
  margin-bottom: 3.5rem;
}

.timeline-item {
  position: relative;
  margin-bottom: 2.75rem;
}

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

.timeline-marker {
  position: absolute;
  top: 0.25rem;
  left: calc(-2rem - 6px);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 0.35rem;
}

.timeline-role {
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.65rem;
}

.timeline-bullets {
  padding-left: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.timeline-bullets li {
  margin-bottom: 0.35rem;
}

/* Awards Box */
.awards-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--card-shadow);
}

.awards-title {
  font-size: 1.2rem;
  margin-bottom: 1.25rem;
}

.awards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.award-chip {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.85rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.award-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-amber);
  background: var(--accent-amber-bg);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
}

.award-chip div {
  display: flex;
  flex-direction: column;
}

.award-chip strong {
  font-size: 0.85rem;
  color: var(--text-primary);
}

.award-chip span {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Skills Matrix
   ========================================================================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
}

.skill-cat-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  color: var(--accent-cyan);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.skill-pill-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skill-pill-list li {
  font-size: 0.825rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 1rem;
}

.skill-pill-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-size: 0.75rem;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact-container {
  max-width: 860px;
}

.contact-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--card-shadow);
  text-align: center;
}

.contact-title {
  font-size: 2.2rem;
  margin-bottom: 0.85rem;
}

.contact-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.contact-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  text-align: left;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  transition: all var(--transition-fast);
}

.contact-card:hover {
  border-color: var(--border-active);
  background: var(--bg-tertiary);
}

.contact-card-icon {
  font-size: 1.4rem;
}

.contact-card-info {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.contact-card-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.contact-card-val {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-all;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-primary);
  font-size: 0.825rem;
  color: var(--text-muted);
}

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

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-copy {
  color: var(--text-secondary);
}

.footer-host {
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.back-to-top:hover {
  color: var(--accent-cyan);
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--accent-cyan);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-family: var(--font-mono);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-normal);
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .avatar-card {
    max-width: 300px;
    margin: 0 auto;
  }

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .thrust-cards {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .awards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .pub-figure-wrapper {
    max-width: 360px;
  }
}

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

  .mobile-toggle {
    display: inline-flex;
  }

  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1.5rem;
    gap: 1rem;
    backdrop-filter: blur(16px);
  }

  .conf-list {
    grid-template-columns: 1fr;
  }

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

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

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

  .contact-links-grid {
    grid-template-columns: 1fr;
  }

  .contact-box {
    padding: 2rem 1.25rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1.25rem;
    text-align: center;
  }

  .timeline {
    margin-left: 0.5rem;
    padding-left: 1.25rem;
  }

  .timeline-marker {
    left: calc(-1.25rem - 6px);
  }
}