/* ==========================================================================
   James Ahabyona — Academic Personal Site
   Minimal, text-first design in the style of top US econ faculty pages
   (Chetty, Gentzkow, Acemoglu, Jones). White background, dark text,
   a single accent for links, no decorative chrome.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */
:root {
  /* Pure white background, near-black text, single navy accent for links */
  --color-text:       #111111;
  --color-text-muted: #555555;
  --color-link:       #1a365d;     /* Dark navy — used for links and active state */
  --color-link-hover: #0a1d36;
  --color-rule:       #d8d8d8;     /* Hairline rules, calendar-style */
  --color-rule-soft:  #ececec;
  --color-bg:         #ffffff;
  --color-bg-alt:     #f7f7f5;     /* Very faint off-white for table stripes */

  /* Typography — system sans, no decorative serifs */
  --font-sans:   -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter",
                 Helvetica, Arial, sans-serif;
  --font-serif:  Georgia, "Times New Roman", Times, serif;  /* used sparingly */
  --font-mono:   "SF Mono", "JetBrains Mono", Consolas, "Liberation Mono", monospace;

  --fs-sm:   0.9rem;
  --fs-base: 1.0625rem;     /* 17px — more open, more "wide" feeling */
  --fs-md:   1.125rem;      /* 18px */
  --fs-lg:   1.25rem;       /* 20px */
  --fs-xl:   1.5rem;        /* 24px */
  --fs-2xl:  1.875rem;      /* 30px */
  --fs-3xl:  2.5rem;        /* 40px */

  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2.5rem;           /* more breathing room */
  --sp-7: 4rem;             /* larger section gaps */
  --sp-8: 6rem;             /* top/bottom of major sections */
  --sp-9: 8rem;

  --container:        900px;        /* Wider content column */
  --container-narrow: 760px;
  --container-wide:   1100px;
}

/* --------------------------------------------------------------------------
   2. Reset + base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; }

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

p { margin: 0 0 var(--sp-4); }

ul, ol { padding-left: 1.4em; margin: 0 0 var(--sp-4); }
li { margin-bottom: var(--sp-1); }

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 var(--sp-3);
  color: var(--color-text);
}

h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); margin-top: var(--sp-7); }
h3 { font-size: var(--fs-lg); margin-top: var(--sp-5); }
h4 { font-size: var(--fs-base); }

hr {
  border: 0;
  border-top: 1px solid var(--color-rule);
  margin: var(--sp-6) 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--color-bg-alt);
  padding: 1px 4px;
  border-radius: 2px;
}

blockquote {
  margin: var(--sp-4) 0;
  padding: 0 var(--sp-5);
  border-left: 3px solid var(--color-rule);
  color: var(--color-text-muted);
}

.skip-link {
  position: absolute; top: -100px; left: 0;
  background: var(--color-text); color: #fff;
  padding: var(--sp-2) var(--sp-3);
  z-index: 100;
}
.skip-link:focus { top: 0; }

/* --------------------------------------------------------------------------
   3. Layout
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--sp-5);
}
.container--wide { max-width: var(--container-wide); }
.container-narrow { max-width: var(--container-narrow); }

/* --------------------------------------------------------------------------
   4. Header + nav (minimal, text-only, top-of-page)
   -------------------------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-rule);
  padding: var(--sp-6) 0 var(--sp-5);
  margin-bottom: var(--sp-7);
}
.site-header .container {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-5) var(--sp-8);
}

.brand {
  color: var(--color-text);
  font-weight: 600;
  letter-spacing: -0.01em;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  line-height: 1.1;
}
.brand:hover { text-decoration: none; }

.brand-name {
  font-size: var(--fs-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.brand-tag {
  font-size: var(--fs-sm);
  font-weight: 400;
  color: var(--color-text-muted);
  margin-top: 4px;
  letter-spacing: 0;
}
.brand small {
  display: block;
  font-weight: 400;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-top: 2px;
  letter-spacing: 0;
}

.site-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-5);
}
.site-nav a {
  color: var(--color-link);
  font-size: var(--fs-base);
}
.site-nav a.active {
  color: var(--color-text);
  font-weight: 600;
}

.nav-toggle { display: none; }   /* Mobile menu not needed for 5 links */

/* --------------------------------------------------------------------------
   5. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-rule);
  margin-top: var(--sp-8);
  padding: var(--sp-5) 0;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  text-align: center;
}
.site-footer .container { display: flex; flex-direction: column; align-items: center; gap: var(--sp-3); }
.site-footer a { color: var(--color-link); }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: var(--sp-5); justify-content: center; }

/* --------------------------------------------------------------------------
   6. Home page (slim, centered)
   -------------------------------------------------------------------------- */
.intro {
  margin-bottom: var(--sp-7);
  text-align: center;
}
.intro h1 {
  font-size: var(--fs-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-2);
}
.intro .name {
  font-weight: 800;
  font-size: var(--fs-3xl);
  letter-spacing: -0.02em;
  color: var(--color-link);
  margin-bottom: var(--sp-2);
}

/* When the name is inside the navy bio panel, it should be white instead of navy */
.intro .bio-panel .name {
  color: #ffffff;
  margin-top: 0;
  margin-bottom: var(--sp-2);
}
.intro .bio-panel .tagline {
  color: rgba(255, 255, 255, 0.85);
  margin-top: 0;
  margin-bottom: var(--sp-5);
}

/* Navy bio panel — full bleed, touches both horizontal margins */
.intro .bio-panel {
  background: var(--color-link);
  color: #ffffff;
  padding: var(--sp-8) var(--sp-6);
  max-width: none;
  border-radius: 0;
  margin: var(--sp-6) 0 0;
  text-align: center;
}
.intro .bio-panel .bio {
  color: #ffffff;
  margin: 0 auto var(--sp-4);
  max-width: 75ch;
  text-align: left;
}
.intro .bio-panel .bio a {
  color: #ffffff;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.5);
}
.intro .bio-panel .bio a:hover {
  text-decoration-color: #ffffff;
}
.intro .bio-panel .quick-links {
  margin: 0;
  color: #ffffff;
}
.intro .bio-panel .quick-links a {
  color: #ffffff;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.5);
}
.intro .bio-panel .quick-links a:hover {
  text-decoration-color: #ffffff;
}
.intro .bio-panel .quick-links li::before {
  color: rgba(255, 255, 255, 0.6);
}
.intro .tagline {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  margin-bottom: var(--sp-4);
  max-width: 60ch;
  margin-left: auto;
  margin-right: auto;
}
.intro .bio {
  max-width: 60ch;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--sp-4);
}
.intro .quick-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--sp-2) var(--sp-5);
  font-size: var(--fs-sm);
}
.intro .quick-links li::before {
  content: "·";
  margin-right: var(--sp-2);
  color: var(--color-text-muted);
}
.intro .quick-links li:first-child::before { content: ""; margin: 0; }

/* News preview on home (last 3 entries) — heading and list both centered */
.news-preview { margin-top: var(--sp-8); }
.news-preview .news-title,
.news-preview h2 {
  font-size: var(--fs-2xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 0 0 var(--sp-5);
  padding: 0;
  border: 0;
  text-align: center;
}
.news-list { list-style: none; padding: 0; margin: 0; }
.news-item {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: var(--sp-4);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--color-rule-soft);
  text-align: left;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}
.news-item:last-child { border-bottom: 0; }
.news-date {
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-sm);
}
.news-item p { margin: 0; }

/* The Economic Misfit section on home */
.misfit {
  margin-top: var(--sp-8);
  padding-top: var(--sp-8);
  border-top: 1px solid var(--color-rule);
}
.misfit .misfit-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-6);
  flex-wrap: wrap;
  text-align: left;
}
.misfit .misfit-logo-link {
  display: block;
  flex: 0 0 auto;
  line-height: 0;
}
.misfit .misfit-logo {
  display: block;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  margin: 0;
}
.misfit .misfit-text {
  flex: 0 1 480px;
  text-align: left;
}
.misfit .section-eyebrow {
  display: block;
  font-size: var(--fs-xs, 0.78rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: var(--sp-2);
}
.misfit .section-title {
  font-size: var(--fs-2xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 var(--sp-3);
  color: var(--color-text);
}
.misfit .section-title a {
  color: var(--color-link);
  border-bottom: 2px solid var(--color-rule);
  padding-bottom: 2px;
}
.misfit .section-title a:hover {
  border-bottom-color: var(--color-link);
  text-decoration: none;
}
.misfit .section-lead {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  max-width: 75ch;
  margin: 0 auto var(--sp-5);
}
.misfit .misfit-body {
  max-width: 60ch;
  margin: 0 auto var(--sp-5);
}
.misfit h3 {
  font-size: var(--fs-base);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text);
  margin: var(--sp-6) 0 var(--sp-3);
}
.misfit p,
.misfit ul {
  max-width: 60ch;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}
.misfit ul {
  padding-left: 1.4em;
  margin-bottom: var(--sp-4);
}
.misfit ul li {
  margin-bottom: var(--sp-2);
}
.misfit ul li strong {
  color: var(--color-text);
}

.more-link {
  display: inline-block;
  margin-top: var(--sp-3);
  font-size: var(--fs-sm);
}

/* Centered home page (triggered by body.home on the home page) */
body.home .site-header .container {
  justify-content: center;
  text-align: center;
  flex-direction: row;
  gap: var(--sp-8);
}
body.home .site-header .brand {
  align-items: center;
  display: inline-flex;
  flex-direction: column;
}
body.home .site-nav ul { justify-content: center; gap: var(--sp-5); }

/* --------------------------------------------------------------------------
   7. Page header (for /news/, /about/, /research/, /data-visualizations/, /cv/, /resources/)
   -------------------------------------------------------------------------- */
.page-header { margin-bottom: var(--sp-6); padding-bottom: var(--sp-4); border-bottom: 1px solid var(--color-rule); }
.page-header h1,
.page-header .page-title {
  font-size: var(--fs-2xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 var(--sp-2);
}
.page-header .page-eyebrow {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  margin: 0 0 var(--sp-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.page-header .subtitle,
.page-header .page-subtitle {
  color: var(--color-text-muted);
  font-size: var(--fs-md);
  margin: 0;
  max-width: 75ch;
}
.page-content { padding-bottom: var(--sp-6); }

/* Navy page header variant (set body_class: navy-page on a page) */
body.navy-page .page-header {
  background: var(--color-link);
  color: #ffffff;
  padding: var(--sp-7) 0 var(--sp-7);
  margin: 0 0 var(--sp-6);
  border-bottom: 0;
  border-radius: 0;
}
body.navy-page .page-header .container { text-align: center; }
body.navy-page .page-header .page-title,
body.navy-page .page-header h1 {
  color: #ffffff;
  margin-top: 0;
  font-size: var(--fs-3xl);
}
body.navy-page .page-header .page-eyebrow {
  color: rgba(255, 255, 255, 0.75);
}
body.navy-page .page-header .page-subtitle,
body.navy-page .page-header .subtitle {
  color: rgba(255, 255, 255, 0.85);
  margin: var(--sp-3) auto 0;
}

/* --------------------------------------------------------------------------
   8. Research list (per Chetty/Gentzkow style: year — title — co-authors — links)
   -------------------------------------------------------------------------- */
.research-group { margin-top: var(--sp-6); }
.research-group h2 {
  font-size: var(--fs-lg);
  border-bottom: 1px solid var(--color-rule);
  padding-bottom: var(--sp-2);
  margin-top: 0;
}
.research-item {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: var(--sp-4);
  padding: var(--sp-4) 0;
  border-bottom: 1px solid var(--color-rule-soft);
}
.research-item:last-child { border-bottom: 0; }
.research-item .year {
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-sm);
}
.research-item h3 {
  font-size: var(--fs-base);
  font-weight: 600;
  margin: 0 0 var(--sp-1);
}

/* Home page research section (compact, clickable abstracts) */
.research-preview {
  margin-top: var(--sp-8);
  padding-top: 0;
  border-top: 0;
  text-align: center;
}
.research-preview-title {
  font-size: var(--fs-2xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 0 0 var(--sp-5);
  padding: 0;
  border: 0;
  text-transform: none;
}
.research-preview .research-item {
  text-align: left;
  max-width: 820px;
  margin: 0 auto;
}
.research-preview .paper-title {
  cursor: pointer;
  display: inline;
  border-bottom: 1px dotted var(--color-rule);
  padding-bottom: 1px;
  transition: border-color 0.15s var(--ease);
}
.research-preview .paper-title:hover,
.research-preview .paper-title:focus {
  border-bottom-color: var(--color-link);
  outline: none;
}
.research-preview .paper-title::after {
  content: " +";
  color: var(--color-text-muted);
  font-weight: 400;
  margin-left: 2px;
}
.research-preview .paper-title[aria-expanded="true"]::after {
  content: " −";
}
.research-preview .paper-abstract {
  display: none;
  margin: var(--sp-3) 0 var(--sp-3);
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--color-text);
  padding: var(--sp-3) var(--sp-4);
  border-left: 3px solid var(--color-rule);
  background: var(--color-bg-alt);
  text-align: left;
}
.research-preview .paper-abstract[hidden] {
  display: none;
}
.research-preview .paper-abstract.is-open {
  display: block;
}
.research-preview-cta {
  text-align: center;
  margin-top: var(--sp-6);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--color-rule);
}
.research-preview-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}
.research-preview-cta .btn i {
  font-size: 0.85em;
}

/* "Abstract" button + abstract panel (research page) */
.abstract-toggle {
  display: inline-block;
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-link);
  background: transparent;
  border: 1px solid var(--color-link);
  padding: 3px 10px;
  border-radius: 2px;
  cursor: pointer;
  margin: var(--sp-2) 0;
  transition: background 0.15s var(--ease), color 0.15s var(--ease);
}
.abstract-toggle:hover,
.abstract-toggle:focus {
  background: var(--color-link);
  color: #ffffff;
  outline: none;
}
.abstract-toggle.is-open {
  background: var(--color-link);
  color: #ffffff;
}
.research-item .paper-abstract {
  display: none;
  margin: var(--sp-2) 0 var(--sp-3);
  font-size: var(--fs-sm);
  line-height: 1.65;
  color: var(--color-text);
  padding: var(--sp-3) var(--sp-4);
  border-left: 3px solid var(--color-link);
  background: var(--color-bg-alt);
}
.research-item .paper-abstract[hidden] {
  display: none;
}
.research-item .paper-abstract.is-open {
  display: block;
}

/* Stage pill (Working Paper / Work in Progress / Publication) */
.stage {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-rule);
  padding: 2px 8px;
  border-radius: 2px;
  margin-bottom: var(--sp-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.stage--working {
  color: #ffffff;
  background: var(--color-link);
  border-color: var(--color-link);
}
.stage--progress {
  color: var(--color-link);
  background: rgba(26, 54, 93, 0.08);
  border-color: var(--color-link);
}
.stage--published {
  color: #2f7a4f;
  background: rgba(47, 122, 79, 0.08);
  border-color: #2f7a4f;
}
.research-item .coauthors {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  margin: 0 0 var(--sp-2);
}
.research-item .paper-links {
  font-size: var(--fs-sm);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-4);
}
.research-item .paper-links a::before {
  content: "[";
  color: var(--color-text-muted);
  margin-right: 2px;
}
.research-item .paper-links a::after {
  content: "]";
  color: var(--color-text-muted);
  margin-left: 2px;
}
.research-item .status {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-rule);
  padding: 1px 6px;
  border-radius: 2px;
  margin-bottom: var(--sp-1);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* --------------------------------------------------------------------------
   9. About page
   -------------------------------------------------------------------------- */
.about-block { margin-bottom: var(--sp-6); }
.about-block h2 {
  font-size: var(--fs-lg);
  border-bottom: 1px solid var(--color-rule);
  padding-bottom: var(--sp-2);
  margin-top: 0;
  margin-bottom: var(--sp-3);
}
.about-block .entry {
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--color-rule-soft);
}
.about-block .entry:last-child { border-bottom: 0; }
.about-block .entry h3 {
  font-size: var(--fs-base);
  font-weight: 600;
  margin: 0 0 2px;
}
.about-block .entry .meta {
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  margin: 0;
}

/* --------------------------------------------------------------------------
   10. Data visualizations
   -------------------------------------------------------------------------- */
.viz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--sp-5);
  margin-top: var(--sp-4);
}
.viz-card { margin: 0; }
.viz-card img {
  width: 100%;
  border: 1px solid var(--color-rule);
  display: block;
}
.viz-card h3 {
  font-size: var(--fs-base);
  margin: var(--sp-2) 0 var(--sp-1);
}
.viz-card .meta {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin: 0;
}
.coming-soon {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  font-style: italic;
  text-align: center;
  padding: var(--sp-6) 0;
  border: 1px dashed var(--color-rule);
  border-radius: 2px;
  margin: var(--sp-4) 0;
}

/* --------------------------------------------------------------------------
   11. Resources
   -------------------------------------------------------------------------- */
.resources h2 {
  font-size: var(--fs-lg);
  border-bottom: 1px solid var(--color-rule);
  padding-bottom: var(--sp-2);
  margin-top: var(--sp-6);
}
.resources ul { list-style: disc; }

/* --------------------------------------------------------------------------
   12. CV page
   -------------------------------------------------------------------------- */
.cv-embed {
  width: 100%;
  height: 80vh;
  border: 1px solid var(--color-rule);
  margin-top: var(--sp-4);
}
.cv-actions { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin: var(--sp-4) 0; }

/* --------------------------------------------------------------------------
   13. Buttons (used on CV and a few other spots — minimal, link-style)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 6px 12px;
  font-size: var(--fs-sm);
  border: 1px solid var(--color-link);
  color: var(--color-link);
  background: transparent;
  border-radius: 2px;
}
.btn:hover { background: var(--color-link); color: #fff; text-decoration: none; }
.btn-primary { background: var(--color-link); color: #fff; }
.btn-primary:hover { background: var(--color-link-hover); }

/* --------------------------------------------------------------------------
   14. Mobile
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .news-item { padding: var(--sp-2) 0; }
  .research-item { grid-template-columns: 1fr; gap: var(--sp-1); }
  .research-item .year { font-size: 0.8rem; }
  .site-nav ul { gap: var(--sp-4); }
  .intro h1 { font-size: var(--fs-2xl); }
  .site-footer .container { flex-direction: column; gap: var(--sp-3); }
}