/* ============================================
   CUSTOM PROPERTIES
   ============================================ */
:root {
  --bg-primary: #0d0d0d;
  --bg-secondary: #141410;
  --bg-card: #1a1a14;
  --bg-card-hover: #22221a;

  --accent-cyan: #d4a024;
  --accent-blue: #e8b84a;
  --accent-purple: #c48820;
  --accent-glow: rgba(212, 160, 36, 0.15);

  --text-primary: #f0ede8;
  --text-secondary: #b0a890;
  --text-muted: #7a7060;

  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;

  --max-width: 1200px;
  --nav-height: 64px;

  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 600ms ease;

  --border-subtle: 1px solid rgba(212, 160, 36, 0.1);
  --border-glow: 1px solid rgba(212, 160, 36, 0.3);
  --shadow-glow: 0 0 30px rgba(212, 160, 36, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: 3px;
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p {
  color: var(--text-secondary);
  max-width: 65ch;
}

.mono {
  font-family: var(--font-mono);
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--space-xl) 0;
  scroll-margin-top: var(--nav-height);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-cyan);
  margin-bottom: var(--space-xs);
}

.section-title {
  margin-bottom: var(--space-lg);
}

.section-hint {
  font-size: 0.9rem;
  color: var(--text-muted, rgba(180, 180, 180, 0.7));
  font-style: italic;
  margin-top: calc(-1 * var(--space-md));
  margin-bottom: var(--space-lg);
}

/* ============================================
   NAVIGATION
   ============================================ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-nav.is-scrolled {
  background: rgba(13, 13, 13, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(212, 160, 36, 0.1);
}

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

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}

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

.nav-link:hover,
.nav-link.is-active {
  color: var(--text-primary);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle.is-open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.is-open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   CANVAS PLACEHOLDERS
   ============================================ */
.canvas-placeholder {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 300px;
  background: radial-gradient(ellipse at center, var(--bg-secondary) 0%, var(--bg-primary) 70%);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.canvas-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 40%, rgba(212, 160, 36, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(180, 140, 30, 0.04) 0%, transparent 50%);
  animation: placeholderPulse 4s ease-in-out infinite alternate;
}

.canvas-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(180, 140, 30, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(180, 140, 30, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.canvas-placeholder.canvas-active::before,
.canvas-placeholder.canvas-active::after {
  display: none;
}

.canvas-placeholder canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-placeholder--full {
  border-radius: 0;
  min-height: 500px;
}

.canvas-placeholder--hero {
  position: absolute;
  inset: 0;
  min-height: auto;
  border-radius: 0;
}

@keyframes placeholderPulse {
  from { opacity: 0.5; }
  to { opacity: 1; }
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0;
  overflow: hidden;
}

.hero .canvas-placeholder--hero {
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  width: 100%;
}

.hero-content--split {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-lg);
  align-items: center;
}

.hero-photo {
  flex-shrink: 0;
}

.hero-photo__img {
  width: 280px;
  height: 340px;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-lg);
  mask-image: radial-gradient(ellipse 85% 80% at center, black 50%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 85% 80% at center, black 50%, transparent 100%);
}

.hero-name {
  font-size: clamp(3rem, 7vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-xs);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: var(--space-md);
}

.hero-tagline {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--text-muted);
  max-width: 50ch;
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.4rem 0.8rem;
  border-radius: 100px;
  background: rgba(212, 160, 36, 0.08);
  border: 1px solid rgba(212, 160, 36, 0.2);
  color: var(--accent-cyan);
  white-space: nowrap;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  border: var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn--primary {
  background: rgba(212, 160, 36, 0.1);
  border-color: rgba(212, 160, 36, 0.3);
  color: var(--accent-cyan);
}

/* ============================================
   RESEARCH SECTION
   ============================================ */
.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.research-strip {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  align-content: flex-start;
  align-self: center;
}

.research-tags .tag {
  font-size: 0.95rem;
  padding: 0.4em 0.9em;
}

.research-themes {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.research-item {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: var(--border-subtle);
  background: rgba(26, 26, 20, 0.5);
  transition: all var(--transition-base);
}

.research-item:hover {
  border-color: rgba(212, 160, 36, 0.2);
  background: rgba(26, 26, 20, 0.7);
  transform: translateX(4px);
}

.research-item h3 {
  margin-bottom: var(--space-xs);
  font-size: 1.1rem;
}

.research-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.research-visual {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-md));
}

.research-visual .canvas-placeholder {
  aspect-ratio: 1;
  min-height: auto;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.project-card {
  display: block;
  border-radius: var(--radius-lg);
  border: var(--border-subtle);
  background: var(--bg-card);
  overflow: hidden;
  transition: all var(--transition-base);
  color: inherit;
}

.project-card:hover {
  border-color: rgba(212, 160, 36, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), var(--shadow-glow);
}

.project-card__canvas {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.project-card__canvas .canvas-placeholder {
  min-height: auto;
  height: 100%;
  border-radius: 0;
}

.project-card__content {
  padding: var(--space-md);
}

.project-card__title {
  font-size: 1.2rem;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.project-card__subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-card__tags .tag {
  font-size: 0.7rem;
  padding: 0.3rem 0.6rem;
}

.projects-more {
  display: flex;
  justify-content: center;
  margin-top: var(--space-lg);
}

.projects-grid--uniform {
  grid-template-columns: repeat(3, 1fr);
}

.projects-grid--uniform .project-card:first-child {
  grid-column: auto;
}

.project-card--static {
  cursor: default;
}

.project-card--static:hover {
  border-color: var(--border-color, rgba(255, 255, 255, 0.08));
  transform: none;
  box-shadow: none;
}

.project-card__result {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
  margin-bottom: var(--space-sm);
  line-height: 1.55;
}

.project-card__result strong {
  color: var(--text-primary);
  font-weight: 600;
}

.project-card__code {
  display: inline-block;
  margin-top: var(--space-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent, #5a94c4);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.project-card__code:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  .projects-grid--uniform {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   PUBLICATIONS SECTION
   ============================================ */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.pub-card {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: var(--border-subtle);
  background: rgba(26, 26, 20, 0.3);
  transition: all var(--transition-base);
}

.pub-card:hover {
  border-color: rgba(212, 160, 36, 0.2);
  background: rgba(26, 26, 20, 0.5);
}

.pub-card__venue {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}

.pub-card__status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.pub-card__title {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.pub-card__authors {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pub-card__links {
  margin-top: var(--space-xs);
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.pub-card__links a {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent, #5a94c4);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.pub-card__links a:hover {
  text-decoration: underline;
}

/* ============================================
   TIMELINE SECTION
   ============================================ */
.timeline-container {
  position: relative;
  overflow-x: auto;
  padding: var(--space-lg) 0;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.timeline-container::-webkit-scrollbar {
  display: none;
}

.timeline-track {
  display: flex;
  gap: 0;
  min-width: max-content;
  position: relative;
  padding: 0 var(--space-md);
}

.timeline-track::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(212, 160, 36, 0.3), rgba(232, 184, 74, 0.3), transparent);
  transform: translateY(-50%);
}

.timeline-node {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 250px;
  padding: var(--space-md);
  text-align: center;
}

.timeline-node__dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-cyan);
  position: relative;
  z-index: 1;
  margin-bottom: var(--space-sm);
  transition: all var(--transition-base);
}

.timeline-node:hover .timeline-node__dot {
  background: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(212, 160, 36, 0.4);
}

.timeline-node__year {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.4rem;
}

.timeline-node__label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 200px;
  line-height: 1.5;
}

.timeline-node__org {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  padding: var(--space-lg) 0;
  border-top: var(--border-subtle);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-links {
  display: flex;
  gap: var(--space-md);
}

.footer-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================
   PROJECT DETAIL PAGES
   ============================================ */
.project-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-md);
  background: rgba(13, 13, 13, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-subtle);
}

.back-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.project-nav__title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.project-hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: flex-end;
  padding-top: var(--nav-height);
}

.project-hero .canvas-placeholder--full {
  position: absolute;
  inset: 0;
  min-height: auto;
}

.project-hero__overlay {
  position: relative;
  z-index: 1;
  padding: var(--space-lg) var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  background: linear-gradient(to top, var(--bg-primary) 0%, transparent 100%);
}

.project-hero__overlay h1 {
  margin-bottom: var(--space-xs);
}

.project-hero__tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.project-section {
  padding: var(--space-xl) 0;
}

.project-section__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  align-items: center;
}

.project-section__text h2 {
  margin-bottom: var(--space-sm);
}

.project-section__text p {
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
  line-height: 1.8;
}

.project-section__visual .canvas-placeholder {
  aspect-ratio: 4/3;
  min-height: auto;
}

.section-video {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: contain;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
}

.pipeline-diagram {
  width: 100%;
  height: auto;
  max-width: 520px;
  margin: 0 auto;
  display: block;
}

.results-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

/* Equation card */
.equation-card {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.equation-card__inner {
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.equation-card__canvas .canvas-placeholder {
  aspect-ratio: 1;
  min-height: auto;
}

.equation-card__content h2 {
  margin-bottom: var(--space-md);
}

.equation-card__note {
  margin-top: var(--space-md);
  font-size: 0.72rem;
  line-height: 1.4;
  color: var(--text-muted);
  opacity: 0.65;
  font-style: italic;
  letter-spacing: 0.01em;
}

.equation-block {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-cyan);
  background: rgba(212, 160, 36, 0.05);
  border: 1px solid rgba(212, 160, 36, 0.1);
  border-radius: var(--radius-sm);
  padding: var(--space-sm);
  margin-bottom: var(--space-sm);
  overflow-x: auto;
}

/* Results section */
.results-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.results-container h2 {
  margin-bottom: var(--space-md);
}

.results-comparison .canvas-placeholder {
  aspect-ratio: 2/1;
  min-height: auto;
  margin-bottom: var(--space-md);
}

.steering-figure {
  margin: var(--space-md) 0 var(--space-lg);
}

.steering-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  align-items: center;
}

.steering-col-label {
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  color: var(--text-secondary, #b0a890);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.steering-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
}

.steering-figure--plot {
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.steering-plot {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
  padding: var(--space-sm);
}

.steering-figure figcaption {
  margin-top: var(--space-sm);
  text-align: center;
  font-size: 0.85rem;
  line-height: 1.5;
}

.slider-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.slider-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.slider-group label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  min-width: 120px;
}

.slider-group input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(212, 160, 36, 0.2);
  border-radius: 2px;
  outline: none;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(212, 160, 36, 0.4);
}

/* Impact section */
.impact-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.impact-container h2 {
  margin-bottom: var(--space-md);
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-sm);
}

.impact-item {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  border: var(--border-subtle);
  background: rgba(26, 26, 20, 0.3);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Links section */
.links-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.links-container h2 {
  margin-bottom: var(--space-md);
}

.link-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.link-card {
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-sm);
  border: var(--border-subtle);
  background: rgba(26, 26, 20, 0.3);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  transition: all var(--transition-base);
}

.link-card:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
}

.link-card--disabled {
  opacity: 0.55;
  font-style: italic;
  cursor: default;
}

.link-card--disabled:hover {
  border-color: var(--border-subtle, rgba(255,255,255,0.1));
  color: var(--text-secondary);
  box-shadow: none;
}

/* ============================================
   SECTION REVEAL ANIMATIONS
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.reveal-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal-children.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

.reveal-children.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-children.is-visible > *:nth-child(2) { transition-delay: 100ms; }
.reveal-children.is-visible > *:nth-child(3) { transition-delay: 200ms; }
.reveal-children.is-visible > *:nth-child(4) { transition-delay: 300ms; }
.reveal-children.is-visible > *:nth-child(5) { transition-delay: 400ms; }

/* ============================================
   RESPONSIVE — TABLET (1024px)
   ============================================ */
@media (max-width: 1024px) {
  .research-grid {
    grid-template-columns: 1fr;
  }

  .research-visual {
    position: relative;
    top: auto;
  }

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

  .equation-card__inner {
    grid-template-columns: 1fr;
  }

  .project-section__grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   RESPONSIVE — TABLET PORTRAIT (768px)
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(13, 13, 13, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
  }

  .nav-links.is-open {
    opacity: 1;
    pointer-events: all;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-link {
    font-size: 1.2rem;
  }

  .hero-content--split {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-photo {
    order: -1;
    justify-self: center;
  }

  .hero-photo__img {
    width: 200px;
    height: 240px;
  }

  .hero-tags {
    justify-content: center;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-name {
    font-size: clamp(2.2rem, 8vw, 3.5rem);
  }

  .timeline-node {
    min-width: 200px;
  }

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

/* ============================================
   RESPONSIVE — MOBILE (480px)
   ============================================ */
@media (max-width: 480px) {
  :root {
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 5rem;
  }

  .canvas-placeholder {
    min-height: 200px;
  }

  .hero-buttons {
    flex-direction: column;
  }

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

  .project-card__canvas {
    aspect-ratio: 3/2;
  }

  .timeline-node {
    min-width: 160px;
  }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .canvas-placeholder::before {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .reveal-children > * {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .project-card:hover {
    transform: none;
  }

  .btn:hover {
    transform: none;
  }
}

/* ============================================
   THEMED FIGURE (recolor white-bg media)
   ============================================ */
.results-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glow);
}

.results-figure figcaption {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  max-width: 60ch;
}

.themed-figure {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  display: block;
  filter: invert(0.92) hue-rotate(180deg) saturate(1.1) sepia(0.35) hue-rotate(-15deg) brightness(0.95);
  mix-blend-mode: screen;
}

.orbit-figure {
  margin: 0;
}

.orbit-figure__caption {
  text-align: center;
  margin-top: var(--space-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
}

.orbit-figure__hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: normal;
  margin-left: 0.4em;
}

.three-body-svg,
.invariants-svg {
  width: 100%;
  height: auto;
  max-height: 360px;
  display: block;
  background: var(--bg-card);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  box-shadow: var(--shadow-glow);
}