/* ============================================================
   Design tokens — Roberto Foa
   Editorial / academic aesthetic. Ivory surfaces, deep ink text,
   restrained "Cambridge blue" accent. Serif display + humanist body.
   ============================================================ */

:root, [data-theme='light'] {
  /* Surfaces — warm ivory (paper) */
  --color-bg: #f4efe6;
  --color-surface: #f8f4ec;
  --color-surface-2: #fbf8f1;
  --color-surface-offset: #ebe4d6;
  --color-divider: #d9d1bf;
  --color-border: #c9c0aa;

  /* Text — deep ink */
  --color-text: #1c1a17;
  --color-text-muted: #6a6355;
  --color-text-faint: #9c9483;
  --color-text-inverse: #f8f4ec;

  /* Accent — deep Cambridge-adjacent ink blue */
  --color-primary: #1e3a5f;
  --color-primary-hover: #14294a;
  --color-primary-active: #0d1c34;
  --color-primary-highlight: #d8dde6;

  /* Second accent — burgundy for scholarly citations */
  --color-accent-2: #7a2b2b;

  /* Radius */
  --radius-sm: 2px;
  --radius-md: 3px;
  --radius-lg: 6px;

  /* Transitions */
  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows — very subtle */
  --shadow-sm: 0 1px 2px rgba(28, 26, 23, 0.05);
  --shadow-md: 0 4px 16px rgba(28, 26, 23, 0.08);
  --shadow-lg: 0 12px 32px rgba(28, 26, 23, 0.12);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fluid type scale */
  --text-xs:   clamp(0.75rem, 0.7rem + 0.15vw, 0.8125rem);
  --text-sm:   clamp(0.8125rem, 0.78rem + 0.2vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-md:   clamp(1.0625rem, 1rem + 0.35vw, 1.1875rem);
  --text-lg:   clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --text-xl:   clamp(1.5rem, 1.25rem + 1.1vw, 2.125rem);
  --text-2xl:  clamp(2rem, 1.4rem + 2.4vw, 3.25rem);
  --text-hero: clamp(2.5rem, 1.6rem + 3.6vw, 4.75rem);

  /* Fonts */
  --font-display: 'EB Garamond', 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-body: 'Source Serif 4', 'EB Garamond', Georgia, serif;
  --font-ui: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #16171a;
  --color-surface: #1b1c20;
  --color-surface-2: #202126;
  --color-surface-offset: #24252a;
  --color-divider: #2b2c31;
  --color-border: #3a3b41;
  --color-text: #d9d4c8;
  --color-text-muted: #8a8578;
  --color-text-faint: #5e5a51;
  --color-text-inverse: #16171a;
  --color-primary: #8fb3d9;
  --color-primary-hover: #a9c4e0;
  --color-primary-active: #c3d5e8;
  --color-primary-highlight: #253244;
  --color-accent-2: #c78585;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #16171a;
    --color-surface: #1b1c20;
    --color-surface-2: #202126;
    --color-surface-offset: #24252a;
    --color-divider: #2b2c31;
    --color-border: #3a3b41;
    --color-text: #d9d4c8;
    --color-text-muted: #8a8578;
    --color-text-faint: #5e5a51;
    --color-text-inverse: #16171a;
    --color-primary: #8fb3d9;
    --color-primary-hover: #a9c4e0;
    --color-primary-active: #c3d5e8;
    --color-primary-highlight: #253244;
    --color-accent-2: #c78585;
  }
}

body {
  font-family: var(--font-body);
  font-feature-settings: 'kern' 1, 'liga' 1, 'onum' 1;
}

/* Numbers use old-style figures for body, lining for UI */
.ui, nav, header, .meta, time, .badge {
  font-feature-settings: 'kern' 1, 'liga' 1, 'lnum' 1, 'tnum' 1;
}

/* ============================================================
   Layout containers
   ============================================================ */
.wrap {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}
.wrap--narrow { max-width: var(--content-narrow); }
.wrap--default { max-width: var(--content-default); }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 92%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-divider);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 1rem;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--color-text);
}
.brand__mark {
  width: 1.4rem;
  height: 1.4rem;
  align-self: center;
  color: var(--color-primary);
  flex-shrink: 0;
}
.brand__sub {
  color: var(--color-text-muted);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: none;
}
@media (min-width: 640px) { .brand__sub { display: inline; } }

.nav {
  display: none;
  gap: 1.75rem;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
}
@media (min-width: 820px) { .nav { display: flex; } }

.nav a {
  text-decoration: none;
  color: var(--color-text-muted);
  position: relative;
  padding-block: 0.35rem;
}
.nav a:hover { color: var(--color-text); }
.nav a.is-active { color: var(--color-text); }
.nav a.is-active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: var(--color-primary);
}

.theme-toggle {
  color: var(--color-text-muted);
  padding: 0.4rem;
  border-radius: var(--radius-md);
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }

/* Mobile nav */
.nav-mobile-toggle {
  display: inline-flex;
  color: var(--color-text-muted);
  padding: 0.4rem;
}
@media (min-width: 820px) { .nav-mobile-toggle { display: none; } }

.nav-mobile {
  display: none;
  border-top: 1px solid var(--color-divider);
  padding-block: 1rem;
  gap: 0.25rem;
  flex-direction: column;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
}
.nav-mobile.is-open { display: flex; }
.nav-mobile a {
  text-decoration: none;
  color: var(--color-text-muted);
  padding: 0.6rem 0;
}
.nav-mobile a:hover { color: var(--color-text); }

/* ============================================================
   Sections
   ============================================================ */
section {
  padding-block: clamp(3rem, 7vw, 6rem);
}
section + section {
  border-top: 1px solid var(--color-divider);
}

.section-eyebrow {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}

.section-lede {
  font-family: var(--font-body);
  font-size: var(--text-md);
  color: var(--color-text-muted);
  max-width: 62ch;
  line-height: 1.65;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  position: relative;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
@media (min-width: 900px) {
  .hero__grid {
    grid-template-columns: 1.35fr 1fr;
    align-items: start;
  }
}

.hero__eyebrow {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.hero__eyebrow::before {
  content: '';
  display: inline-block;
  width: 1.5rem;
  height: 1px;
  background: var(--color-primary);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 1.4rem + 3vw, 4rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.05;
  color: var(--color-text);
  margin-bottom: 1.5rem;
}
.hero__title em {
  font-style: italic;
  color: var(--color-primary);
  font-weight: 400;
}

.hero__lede {
  font-family: var(--font-body);
  font-size: var(--text-md);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 46ch;
  margin-bottom: 2rem;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}
.hero__meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.hero__meta .dot {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--color-primary);
}

.hero__portrait {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: 2px;
  box-shadow: var(--shadow-md);
  max-width: 340px;
  justify-self: end;
}
@media (max-width: 899px) {
  .hero__portrait { max-width: 260px; justify-self: start; }
}
.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  filter: saturate(0.95) contrast(1.02);
}
.hero__portrait::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 60%, rgba(28,26,23,0.15) 100%);
  pointer-events: none;
}

.hero__portrait-caption {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  right: 1rem;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: rgba(248, 244, 236, 0.85);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ============================================================
   About / Introduction — two-column editorial
   ============================================================ */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 4rem);
}
@media (min-width: 820px) {
  .intro-grid {
    grid-template-columns: 1fr 2fr;
  }
}

.intro-sidebar {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
}
.intro-sidebar dt {
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 1.75rem;
}
.intro-sidebar dt:first-of-type { margin-top: 0; }
.intro-sidebar dd {
  color: var(--color-text);
  margin-top: 0.4rem;
  line-height: 1.5;
}
.intro-sidebar dd a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.intro-sidebar dd a:hover {
  border-bottom-color: currentColor;
}

.intro-body p {
  font-family: var(--font-body);
  font-size: var(--text-md);
  line-height: 1.75;
  color: var(--color-text);
  max-width: 62ch;
  margin-bottom: 1.25rem;
}
.intro-body p:last-child { margin-bottom: 0; }
.intro-body a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--color-primary-highlight);
  transition: border-color var(--transition-interactive);
}
.intro-body a:hover { border-bottom-color: var(--color-primary); }

/* Drop cap */
.dropcap::first-letter {
  font-family: var(--font-display);
  float: left;
  font-size: 4.2em;
  line-height: 0.85;
  padding: 0.05em 0.1em 0 0;
  color: var(--color-primary);
  font-weight: 500;
}

/* ============================================================
   Institution cards (Sephira + CFD)
   ============================================================ */
.institutions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 820px) {
  .institutions { grid-template-columns: 1fr 1fr; }
}

.inst-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}
.inst-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3rem; height: 3px;
  background: var(--color-primary);
}

.inst-card__eyebrow {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.inst-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.005em;
  margin-block: 0.25rem 0.5rem;
}
.inst-card__role {
  font-family: var(--font-body);
  font-style: italic;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.inst-card__body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
}
.inst-card__body p + p { margin-top: 0.75rem; }
.inst-card__meta {
  border-top: 1px solid var(--color-divider);
  padding-top: 1rem;
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}
.inst-card__link {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
}
.inst-card__link:hover { border-bottom-color: currentColor; }
.inst-card__link svg { width: 0.85em; height: 0.85em; }

/* ============================================================
   Featured writing
   ============================================================ */
.featured {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.featured__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem 2rem;
  padding-block: 1.75rem;
  border-top: 1px solid var(--color-divider);
  text-decoration: none;
  color: inherit;
  align-items: baseline;
  transition: background var(--transition-interactive);
}
@media (min-width: 720px) {
  .featured__item {
    grid-template-columns: 8rem 1fr auto;
    padding-inline: 0.5rem;
  }
}
.featured__item:last-child { border-bottom: 1px solid var(--color-divider); }
.featured__item:hover {
  background: color-mix(in oklab, var(--color-surface) 60%, transparent);
}

.featured__date {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.featured__title {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 500;
  line-height: 1.35;
  color: var(--color-text);
}
.featured__title em {
  font-style: italic;
  color: var(--color-text-muted);
  font-weight: 400;
}

.featured__venue {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ============================================================
   Media strip (press logos as text)
   ============================================================ */
.press {
  background: var(--color-surface-2);
}
.press__list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.5rem;
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-md);
  color: var(--color-text-muted);
  justify-content: center;
  align-items: center;
}
.press__list span {
  position: relative;
  padding-inline: 0.5rem;
}

/* ============================================================
   Publications page
   ============================================================ */
.page-header {
  padding-block: clamp(3rem, 7vw, 5rem);
  border-bottom: 1px solid var(--color-divider);
}
.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.page-header__lede {
  font-family: var(--font-body);
  font-size: var(--text-md);
  color: var(--color-text-muted);
  max-width: 62ch;
}

.pubs-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-block: 2rem 3rem;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
}
.pubs-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: all var(--transition-interactive);
}
.pubs-nav a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.pub-group {
  margin-bottom: 3rem;
  scroll-margin-top: 6rem;
}
.pub-group__title {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-primary);
  margin-bottom: 1.25rem;
}

.pub {
  padding-block: 1.35rem;
  border-bottom: 1px solid var(--color-divider);
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 0 1.5rem;
  align-items: baseline;
}
.pub__year {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  font-variant-numeric: lining-nums tabular-nums;
}
.pub__body { max-width: none; }
.pub__title {
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}
.pub__title a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-interactive), color var(--transition-interactive);
}
.pub__title a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.pub__meta {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.55;
}
.pub__meta em { color: var(--color-text); font-style: italic; }
.pub__coauthors { color: var(--color-text-muted); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-divider);
  padding-block: clamp(2.5rem, 5vw, 4rem);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
@media (min-width: 720px) {
  .site-footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 3rem;
  }
}
.site-footer__brand {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: 0.5rem;
}
.site-footer__desc {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 42ch;
  line-height: 1.6;
}
.site-footer h4 {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: 1rem;
}
.site-footer ul { list-style: none; }
.site-footer li {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  margin-bottom: 0.5rem;
}
.site-footer a {
  color: var(--color-text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-interactive), border-color var(--transition-interactive);
}
.site-footer a:hover {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}
.site-footer__bottom {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
}

/* ============================================================
   Pull quote
   ============================================================ */
.pullquote {
  border-left: 3px solid var(--color-primary);
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin-block: 1.5rem;
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--color-text);
  line-height: 1.45;
  max-width: 46ch;
}
.pullquote cite {
  display: block;
  font-family: var(--font-ui);
  font-style: normal;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 0.6rem;
}

/* ============================================================
   Utility
   ============================================================ */
.hidden { display: none; }
.text-primary { color: var(--color-primary); }