:root {
  --text: #0b0c0e;
  --muted: #555;
  --light: #f5f6f7;
  --max-width: 1400px;
 --accent: #ff7a1a;
  --hero-width: 88vw;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  color: var(--text);
  background: white;
  line-height: 1.55;
}

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

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

/* ---------------- NAVIGATION ---------------- */

.site-header {
  position: relative;
  padding: 1.4rem 2rem;
  border-bottom: 1px solid #e9e9e9;
}

.nav-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-name {
  font-weight: 700;
  font-size: 1.25rem;
}

.hamburger {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 26px;
  height: 3px;
  background: black;
  margin: 5px 0;
  transition: 0.3s;
}

.hamburger:hover span {
  background: var(--accent);
}

/* MENU OVERLAY */

.menu-overlay {
  position: fixed;
  inset: 0;
  background: white;
  display: none;
  flex-direction: column;
  padding: 2.5rem;
  z-index: 9999;
}

.menu-overlay.open {
  display: flex;
}

.close-menu {
  background: none;
  border: none;
  font-size: 3rem;
  align-self: flex-end;
  cursor: pointer;
  line-height: 1;
}

.overlay-nav {
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.overlay-nav a {
  font-size: 1.6rem;
  font-weight: 500;
}

/* ---------------- HERO ---------------- */

.hero {
  padding: 6rem 2rem 5rem;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.hero h1 {
  font-size: clamp(4.5rem, 8vw, 8rem);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 1.5rem;
}

.hero-text h1 {
  position: relative;
}

.hero-text h1::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.5rem;
  width: 90px;        
  height: 5px;        
  background: var(--accent);
  border-radius: 2px;
}


.hero-subtitle {
  font-size: 1.8rem;
  font-weight: 400;
  max-width: 32ch;
  margin-bottom: 1.8rem;
  margin-top: 1.5rem;
}

.hero-affiliation {
  font-size: 1.1rem;
  color: var(--muted);
}

/* HERO IMAGE (TALL ROTMAN STYLE) */
.hero-image img {
  width: 100%;
  height: 100%;
  max-height: 95vh;
  object-fit: cover;
  object-position: center top;
  border-radius: 2px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
}

/* ---------------- SECTIONS ---------------- */

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 6rem 2rem;
  border-top: 2px solid #e0e0e0;
}

.section:first-of-type {
  border-top: none;
}

.section h2 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.section > p {
  font-size: 1.2rem;
  line-height: 1.7;
  max-width: 70ch;
}

.bio p {
  margin-bottom: 1.5rem;
}

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

.cards {
  display: grid;
  gap: 3rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-top: 2.5rem;
}

.card {
  padding: 2rem;
  border-radius: 4px;
  background: #fafafa;
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: white;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

.card h3 {
  margin-top: 0;
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  transition: color 0.3s ease;
}

.card:hover h3 {
  color: var(--accent);
}

.card-summary {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 0;
}

.card-detail {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: all 0.4s ease;
  margin-top: 0;
}

.card:hover .card-detail {
  max-height: 300px;
  opacity: 1;
  margin-top: 1.25rem;
}

.card-detail p {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--muted);
  margin: 0;
}

.contact-links a {
  margin-right: 0.5rem;
}

/* Featured Work Styling */
.featured-work {
  margin-top: 2.5rem;
}

.work-item {
  margin-bottom: 3.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid #e9e9e9;
}

.work-item:last-child {
  border-bottom: none;
  margin-bottom: 2rem;
  padding-bottom: 0;
}

.work-item h3 {
  font-size: 1.6rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.work-item h3 a {
  color: var(--text);
  transition: color 0.2s ease;
}

.work-item h3 a:hover {
  color: var(--accent);
}

.work-citation {
  font-size: 1rem;
  color: var(--muted);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.work-award {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 1rem;
}

.work-description {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.work-media {
  font-size: 0.95rem;
  color: var(--muted);
  margin-top: 1rem;
}

.media-label {
  font-weight: 500;
  color: var(--text);
}

.work-media a {
  color: var(--muted);
  text-decoration: underline;
  transition: color 0.2s ease;
}

.work-media a:hover {
  color: var(--accent);
}

.work-footer {
  margin-top: 2.5rem;
  font-size: 1.05rem;
}

.work-footer a {
  color: var(--accent);
  font-weight: 500;
  transition: opacity 0.2s ease;
}

.work-footer a:hover {
  opacity: 0.8;
}

/* ---------------- FOOTER ---------------- */

.site-footer {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid #eee;
}

/* ---------------- PAGE HEADER (for subpages) ---------------- */

.page-header {
  padding: 4rem 2rem 3rem;
  border-bottom: 2px solid #e0e0e0;
}

.page-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-header h1 {
  font-size: clamp(3rem, 5vw, 4.5rem);
  font-weight: 700;
  margin: 0;
}

.page-subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  margin-top: 1rem;
}

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

/* ---------------- ARTICLES PAGE ---------------- */

.articles-list {
  max-width: 900px;
}

.article-item {
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid #e9e9e9;
}

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

.article-item h3 {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 0.75rem 0;
}

.article-meta {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.article-award {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.article-links {
  font-size: 0.95rem;
}

.article-links a {
  color: var(--muted);
  text-decoration: underline;
  transition: color 0.2s ease;
}

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

/* ---------------- WORKING PAPERS PAGE ---------------- */

.working-papers-list {
  max-width: 900px;
}

.paper-item {
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid #e9e9e9;
}

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

.paper-item h3 {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 0.75rem 0;
}

.paper-item h3 a {
  color: var(--text);
  transition: color 0.2s ease;
}

.paper-item h3 a:hover {
  color: var(--accent);
}

.paper-meta {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------------- CONTACT PAGE ---------------- */

.contact-page {
  max-width: 800px;
}

.contact-content {
  display: grid;
  gap: 3rem;
}

.contact-section h2 {
  font-size: 1.6rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

.contact-section p {
  font-size: 1.1rem;
  line-height: 1.7;
  margin: 0;
}

.contact-section a {
  color: var(--accent);
  font-weight: 500;
  transition: opacity 0.2s ease;
}

.contact-section a:hover {
  opacity: 0.8;
}

.profile-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.profile-links li {
  margin-bottom: 0.75rem;
}

.profile-links a {
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 500;
  text-decoration: underline;
  transition: opacity 0.2s ease;
}

.profile-links a:hover {
  opacity: 0.8;
}

/* ---------------- BOOKS PAGE ---------------- */

.book-showcase {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.book-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 5rem;
  align-items: start;
}

.book-cover img {
  width: 100%;
  max-width: 450px;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.book-details h2 {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-top: 0;
  margin-bottom: 1.5rem;
}

.book-meta {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--muted);
  margin-bottom: 2rem;
}

.book-meta strong {
  color: var(--text);
  font-weight: 600;
}

.book-description {
  margin-bottom: 2.5rem;
}

.book-description p {
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.book-links h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.review-links {
  list-style: none;
  padding: 0;
  margin-bottom: 2rem;
}

.review-links li {
  margin-bottom: 0.5rem;
}

.review-links a {
  font-size: 1.05rem;
  color: var(--muted);
  text-decoration: underline;
  transition: color 0.2s ease;
}

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

.buy-link {
  margin-top: 2rem;
}

.cta-button {
  display: inline-block;
  padding: 0.9rem 1.8rem;
  background: var(--accent);
  color: white !important;
  font-weight: 600;
  font-size: 1.05rem;
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.cta-button:hover {
  background: #e66d15;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 122, 26, 0.3);
}

/* Responsive for books page */
@media (max-width: 900px) {
  .book-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .book-cover img {
    max-width: 350px;
  }
}

/* ---------------- RESPONSIVE ---------------- */

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-image img {
    max-height: 70vh;
  }
}