:root {
  --bg: #f8f8f5;
  --bg-soft: #eef1f4;
  --bg-card: #ffffff;
  --bg-card-alt: #f1f3f5;
  --text: #1f2933;
  --text-dim: #5b6470;
  --accent: #17324d;
  --accent-dark: #0f253b;
  --accent-light: #a66a2c;
  --accent-glow: rgba(23, 50, 77, .12);
  --border: #d6dce3;
  --shadow: 0 22px 60px rgba(31, 41, 51, .1);
  --radius: 14px;
  --radius-sm: 8px;
  --font-serif: 'Literata', Georgia, serif;
  --font-sans: 'IBM Plex Sans', 'Helvetica Neue', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, rgba(111, 127, 149, .12), transparent 32rem),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 42%, #eef1f4 100%);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .85rem 5vw;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 26px rgba(31, 41, 51, .055);
}

.wordmark {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .01em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  min-width: 0;
}

nav a {
  font-size: .9rem;
  font-weight: 700;
  color: var(--text-dim);
  transition: color .18s;
}

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

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr);
  gap: 2rem;
  align-items: center;
  padding: 4rem 0 3rem;
}

.hero-content {
  max-width: 720px;
  min-width: 0;
}

.hero-label {
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--accent);
  margin-bottom: .5rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.75rem, 5.2vw, 4.2rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--text);
  letter-spacing: -.025em;
}

.hero-subtitle {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--accent-dark);
  margin-top: .6rem;
}

.hero-lead {
  margin-top: .75rem;
  max-width: 52ch;
  color: var(--text-dim);
  font-size: 1.05rem;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 1.4rem;
}

.hero-portrait {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: #17212d;
  border: 1px solid rgba(31, 41, 51, .18);
  box-shadow: var(--shadow);
}

.hero-portrait::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 40%;
  background: linear-gradient(180deg, transparent, rgba(15, 37, 59, .84));
  pointer-events: none;
}

.hero-portrait img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center 12%;
}

.hero-portrait figcaption {
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 1;
  color: #fff;
  font-size: .86rem;
  font-weight: 700;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: .62rem 1.15rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: .9rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .18s, background .18s, border-color .18s, color .18s, box-shadow .18s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 10px 24px rgba(23, 50, 77, .16);
}

.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.btn-outline {
  border-color: var(--border);
  color: var(--accent-dark);
  background: rgba(255, 255, 255, .62);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: #ffffff;
}

.btn-sm {
  padding: .4rem .85rem;
  font-size: .82rem;
}

/* Sections */
.section {
  padding: 3rem 0;
}

.section-alt {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, .92), rgba(238, 241, 244, .9)),
    var(--bg-card-alt);
  margin: 0 -1.25rem;
  padding: 3rem calc(1.25rem + 5vw);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

@media (min-width: 1100px) {
  .section-alt {
    margin: 0 calc(-50vw + 550px);
    padding: 3rem calc(50vw - 550px + 1.25rem);
  }
}

.section-header {
  margin-bottom: 1.5rem;
}

h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.015em;
}

.section-sub {
  margin-top: .35rem;
  color: var(--text-dim);
  font-size: .98rem;
}

h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: .4rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 2rem;
}

.about-grid > *,
.current-card,
.book-card,
.pub-item,
.contact-item,
.book-detail-grid > * {
  min-width: 0;
}

.about-text p {
  color: var(--text-dim);
  margin-bottom: .8rem;
}

.about-text em {
  color: var(--accent-dark);
  font-style: normal;
  font-weight: 700;
}

.field-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.field-list li {
  padding: .42rem .76rem;
  border-radius: 999px;
  background: var(--accent-glow);
  border: 1px solid rgba(23, 50, 77, .18);
  color: var(--accent-dark);
  font-size: .84rem;
  font-weight: 700;
}

/* Current Work */
.section-current {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

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

.current-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, .96), rgba(111, 127, 149, .08));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: 0 14px 38px rgba(31, 41, 51, .055);
  transition: border-color .18s, transform .18s, box-shadow .18s;
}

.current-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.current-date {
  display: inline-block;
  margin-bottom: .55rem;
  padding: .18rem .55rem;
  border-radius: 999px;
  background: rgba(166, 106, 44, .1);
  border: 1px solid rgba(166, 106, 44, .2);
  color: var(--accent-light);
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.current-card p {
  font-size: .92rem;
  color: var(--text-dim);
}

/* AI Methods Blog */
.section-methods {
  position: relative;
  border-bottom: 1px solid var(--border);
}

.section-methods::before {
  content: "";
  position: absolute;
  inset: 1.75rem 0 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(23, 50, 77, .26), transparent);
}

.methods-intro {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
  padding: 1.1rem 1.2rem;
  background: rgba(255, 255, 255, .76);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 34px rgba(31, 41, 51, .05);
}

.methods-intro p {
  max-width: 76ch;
  color: var(--text-dim);
}

.methods-intro .btn {
  flex: 0 0 auto;
  white-space: nowrap;
}

.method-foundation {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: start;
  margin-bottom: 1.25rem;
  padding: 1.25rem;
  background:
    linear-gradient(135deg, rgba(23, 50, 77, .07), rgba(255, 255, 255, .96)),
    var(--bg-card);
  border: 1px solid rgba(23, 50, 77, .2);
  border-radius: var(--radius);
  box-shadow: 0 16px 42px rgba(31, 41, 51, .065);
}

.method-foundation .method-eyebrow {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.method-foundation h3 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -.01em;
}

.method-foundation p {
  margin-top: .65rem;
  color: var(--text-dim);
}

.method-foundation .method-link {
  margin-top: 0;
  padding-top: .2rem;
  white-space: nowrap;
}

.methods-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.method-post {
  display: flex;
  min-width: 0;
  min-height: 100%;
  flex-direction: column;
  background: linear-gradient(180deg, rgba(255, 255, 255, .99), rgba(241, 243, 245, .82));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: 0 14px 38px rgba(31, 41, 51, .055);
  transition: border-color .18s, transform .18s, box-shadow .18s;
}

.method-post:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.method-eyebrow {
  display: inline-block;
  align-self: flex-start;
  margin-bottom: .65rem;
  padding: .18rem .55rem;
  border-radius: 999px;
  background: rgba(23, 50, 77, .08);
  border: 1px solid rgba(23, 50, 77, .16);
  color: var(--accent);
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.method-post h3 {
  font-family: var(--font-serif);
  font-size: 1.28rem;
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -.01em;
}

.method-post p {
  margin-top: .7rem;
  color: var(--text-dim);
  font-size: .92rem;
}

.method-post strong {
  color: var(--accent-dark);
}

.method-link {
  display: inline-flex;
  align-self: flex-start;
  margin-top: auto;
  padding-top: 1rem;
  color: var(--accent);
  font-size: .9rem;
  font-weight: 700;
}

.method-link:hover {
  color: var(--accent-dark);
}

/* Book Cards */
.pub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.book-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: 0 14px 38px rgba(31, 41, 51, .055);
  transition: border-color .18s, transform .18s, box-shadow .18s;
}

.book-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.book-card .book-meta {
  font-size: .86rem;
  color: var(--accent-light);
  font-weight: 700;
  margin: .3rem 0 .6rem;
}

.book-card p:last-of-type {
  color: var(--text-dim);
  font-size: .92rem;
}

.book-card .cite-buttons {
  display: flex;
  gap: .4rem;
  margin-top: .75rem;
}

/* Cite Buttons */
.cite-btn {
  padding: .3rem .6rem;
  border-radius: var(--radius-sm);
  background: rgba(23, 50, 77, .07);
  border: 1px solid rgba(23, 50, 77, .16);
  color: var(--accent-dark);
  font-size: .78rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .18s, border-color .18s, color .18s;
}

.cite-btn:hover {
  background: rgba(23, 50, 77, .12);
  border-color: var(--accent);
  color: var(--accent);
}

/* Filter Bar */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin-bottom: 1.2rem;
}

.filter-btn {
  padding: .42rem .82rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, .58);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: .84rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .18s;
}

.filter-btn:hover,
.filter-btn.active,
.filter-btn[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.filter-status {
  min-height: 1.4rem;
  margin: -.5rem 0 1rem;
  color: var(--text-dim);
  font-size: .86rem;
}

/* Article List */
.pub-list {
  display: grid;
  gap: .75rem;
}

.pub-item {
  background: rgba(255, 255, 255, .84);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  box-shadow: 0 10px 28px rgba(31, 41, 51, .045);
  transition: border-color .18s, box-shadow .18s;
}

.pub-item:hover {
  border-color: var(--accent);
  box-shadow: 0 14px 38px rgba(31, 41, 51, .075);
}

.pub-item h3 {
  font-size: 1rem;
}

.pub-item .pub-meta {
  font-size: .86rem;
  color: var(--text-dim);
  margin: .25rem 0;
}

.pub-item .pub-badges {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-top: .5rem;
}

.pub-badge {
  display: inline-flex;
  padding: .2rem .5rem;
  border-radius: 999px;
  font-size: .76rem;
  font-weight: 700;
  background: rgba(31, 41, 51, .06);
  color: var(--text-dim);
}

.pub-item .cite-buttons {
  display: flex;
  gap: .35rem;
  margin-top: .6rem;
}

.pub-item .pub-summary {
  font-size: .92rem;
  color: var(--text-dim);
  margin-top: .5rem;
}

/* Featured Article */
.pub-item-featured {
  border-color: rgba(23, 50, 77, .32);
  background: linear-gradient(135deg, rgba(23, 50, 77, .08), rgba(255, 255, 255, .94));
}

.pub-eyebrow {
  font-size: .78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--accent);
  margin-bottom: .25rem;
}

/* Contact Grid */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .85rem;
}

.contact-item {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-decoration: none;
  box-shadow: 0 10px 28px rgba(31, 41, 51, .045);
  transition: border-color .18s, transform .18s, box-shadow .18s;
}

.contact-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.contact-item strong {
  display: block;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--accent);
  margin-bottom: .25rem;
}

.contact-item span {
  color: var(--text-dim);
  font-size: .92rem;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-dim);
  font-size: .86rem;
  border-top: 1px solid var(--border);
}

/* Citation Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(31, 41, 51, .46);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow);
}

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

.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.5rem;
  cursor: pointer;
  padding: .25rem;
}

.modal-close:hover,
.modal-close:focus-visible {
  color: var(--text);
}

.modal-tabs {
  display: flex;
  gap: .5rem;
  margin-bottom: 1rem;
}

.modal-tab {
  padding: .35rem .7rem;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: .82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .18s;
}

.modal-tab.active,
.modal-tab[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.cite-block {
  background: #f1f3f5;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-size: .82rem;
  line-height: 1.5;
  color: var(--text-dim);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin-bottom: 1rem;
  max-height: 300px;
  overflow-y: auto;
  font-family: 'SF Mono', Consolas, monospace;
}

/* Book Detail Pages */
.back-link {
  display: inline-block;
  font-size: .9rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1.5rem;
  transition: color .18s;
}

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

.book-detail {
  padding-top: 2rem;
}

.book-detail-header {
  margin-bottom: 2rem;
}

.book-detail-header h1 {
  font-size: clamp(1.9rem, 4vw, 2.9rem);
}

.book-detail-meta {
  font-size: 1rem;
  color: var(--accent-light);
  font-weight: 700;
  margin-top: .5rem;
}

.book-detail-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.book-detail-body h2 {
  font-size: 1.25rem;
  margin: 1.5rem 0 .75rem;
  color: var(--text);
}

.book-detail-body h2:first-child {
  margin-top: 0;
}

.book-detail-body p {
  color: var(--text-dim);
  margin-bottom: .8rem;
  line-height: 1.7;
}

.book-detail-sidebar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: sticky;
  top: 5rem;
  box-shadow: 0 14px 38px rgba(31, 41, 51, .055);
}

.book-meta-list {
  display: grid;
  gap: .6rem;
  margin-bottom: 1.5rem;
}

.book-meta-list dt {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--accent);
}

.book-meta-list dd {
  font-size: .92rem;
  color: var(--text-dim);
  margin-bottom: .3rem;
}

.book-detail-links {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.book-detail-links .btn {
  justify-content: center;
  text-align: center;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding: .75rem 1rem;
  margin: 1rem 0;
  background: rgba(23, 50, 77, .06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

blockquote .bq-source {
  display: block;
  margin-top: .35rem;
  font-size: .82rem;
  color: var(--text-dim);
}

/* Hero Quote */
.hero-quote {
  border-left: 3px solid var(--accent);
  padding: .65rem 1rem;
  margin-top: 1rem;
  font-style: italic;
  color: var(--text-dim);
  font-size: .98rem;
  max-width: 52ch;
  background: rgba(23, 50, 77, .06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Project Cards */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: 0 14px 38px rgba(31, 41, 51, .055);
  transition: border-color .18s, box-shadow .18s;
}

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

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: .3rem;
}

.project-publisher {
  font-size: .85rem;
  color: var(--accent-light);
  font-weight: 700;
  margin-bottom: .5rem;
}

.project-card p:last-child {
  color: var(--text-dim);
  font-size: .92rem;
}

.project-status {
  display: inline-block;
  padding: .2rem .55rem;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  background: rgba(23, 50, 77, .1);
  color: var(--accent);
  border: 1px solid rgba(23, 50, 77, .18);
  margin-bottom: .5rem;
}

/* Filter Divider */
.filter-divider {
  width: 1px;
  background: var(--border);
  margin: 0 .3rem;
  align-self: stretch;
}

/* Scholar Link */
.scholar-link {
  text-align: center;
  margin-top: 1.5rem;
}

/* Responsive */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-portrait {
    max-width: 380px;
  }

  .about-grid,
  .current-grid,
  .methods-grid,
  .pub-grid,
  .project-grid,
  .book-detail-grid {
    grid-template-columns: 1fr;
  }

  .methods-intro {
    flex-direction: column;
  }

  .method-foundation {
    grid-template-columns: 1fr;
  }

  .method-foundation .method-link {
    white-space: normal;
  }

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

@media (max-width: 600px) {
  .site-header {
    flex-direction: column;
    align-items: stretch;
    gap: .5rem;
    padding: .85rem 1rem;
  }

  .wordmark {
    text-align: center;
  }

  nav {
    width: 100%;
    justify-content: center;
    column-gap: .5rem;
    row-gap: .35rem;
  }

  nav a {
    font-size: .82rem;
  }

  main {
    padding: 0 1rem;
  }

  .hero {
    padding: 2.5rem 0 2rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

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

  .hero-portrait {
    max-width: none;
  }

  .section-alt {
    padding: 2rem 1rem;
    margin: 0 -1rem;
  }

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