/* whitepapers.xyz — soft serif editorial blog
   Palette
     Paper        #faf8f5
     Ink          #1a1a1a
     Body         #3a3a3a
     Academic     #2c5282
     Highlight    #fff3cd
     Border       #e2ddd5
     Tag BG       #f0ebe3
   Fonts: Cormorant Garamond (display), Lora (body), Inter (meta)
*/

:root {
  --paper: #faf8f5;
  --ink: #1a1a1a;
  --body: #3a3a3a;
  --academic: #2c5282;
  --highlight: #fff3cd;
  --border: #e2ddd5;
  --tag-bg: #f0ebe3;

  --font-display: "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --font-body: "Lora", Georgia, "Times New Roman", serif;
  --font-meta: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  --reading-max: 660px;
  --layout-max: 1000px;
  --side-w: 220px;

  --gap-1: 0.5rem;
  --gap-2: 1rem;
  --gap-3: 1.5rem;
  --gap-4: 2rem;
  --gap-5: 3rem;
  --gap-6: 4rem;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--body);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  font-weight: 400;
}

a {
  color: var(--academic);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease, color 160ms ease;
}
a:hover {
  border-bottom-color: var(--academic);
}

button {
  font: inherit;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 0;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.005em;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }


/* ===== HEADER =================================================== */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(140%) blur(6px);
  -webkit-backdrop-filter: saturate(140%) blur(6px);
}

.header-inner {
  max-width: var(--layout-max);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.4rem;
  color: var(--ink);
  border-bottom: 0;
}
.brand:hover { border-bottom: 0; color: var(--academic); }
.brand-mark {
  display: inline-block;
  color: var(--academic);
  transform: translateY(0.05em);
  font-size: 1.15rem;
}
.brand-name { letter-spacing: -0.01em; }
.brand-dot { color: var(--academic); }

.site-nav {
  display: flex;
  justify-content: center;
  gap: 1.75rem;
  font-family: var(--font-meta);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav-link {
  color: var(--body);
  border-bottom: 0;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.nav-link:hover { color: var(--ink); border-bottom-color: var(--border); }
.nav-link.is-active { color: var(--ink); border-bottom-color: var(--ink); }

.search {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  background: #fff;
  padding: 0.35rem 0.55rem;
  border-radius: 3px;
  width: 260px;
  max-width: 30vw;
  transition: border-color 160ms ease;
}
.search:focus-within { border-color: var(--academic); }
.search input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  font-family: var(--font-meta);
  font-size: 0.78rem;
  color: var(--ink);
  padding: 0.15rem 0.25rem;
}
.search input::placeholder {
  color: #8a8074;
  font-style: italic;
  font-family: var(--font-body);
}
.search button {
  color: #8a8074;
  font-size: 0.95rem;
  padding: 0 0.25rem;
}
.search button:hover { color: var(--academic); }


/* ===== LAYOUT =================================================== */

.layout {
  max-width: var(--layout-max);
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
  display: grid;
  grid-template-columns: var(--side-w) 1fr;
  gap: 3rem;
  align-items: start;
}


/* ===== SIDEBAR ================================================== */

.sidebar {
  position: sticky;
  top: 5rem;
  align-self: start;
  font-family: var(--font-meta);
  font-size: 0.85rem;
  border-right: 1px solid var(--border);
  padding-right: 1.75rem;
}

.side-section {
  margin-bottom: 2.25rem;
}

.side-title {
  font-family: var(--font-meta);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 0.85rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.cat-list, .sort-list, .list-list {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.cat, .sort {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  font-family: var(--font-meta);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--body);
  padding: 0.4rem 0.6rem 0.4rem 0;
  border-left: 2px solid transparent;
  padding-left: 0.7rem;
  margin-left: -0.7rem;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
  border-radius: 0;
}
.cat .cat-count {
  font-size: 0.7rem;
  font-weight: 500;
  color: #8a8074;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}
.cat:hover, .sort:hover {
  color: var(--ink);
  border-left-color: var(--border);
}
.cat.is-active, .sort.is-active {
  color: var(--ink);
  border-left-color: var(--academic);
  background: rgba(44, 82, 130, 0.04);
}
.cat.is-active .cat-count { color: var(--academic); }

.list-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.3rem 0;
  border-bottom: 1px dotted var(--border);
  gap: 0.5rem;
}
.list-list li:last-child { border-bottom: 0; }
.list-list a {
  color: var(--body);
  font-family: var(--font-body);
  font-size: 0.92rem;
  border-bottom: 0;
}
.list-list a:hover { color: var(--academic); }
.list-num {
  font-family: var(--font-meta);
  font-size: 0.7rem;
  color: #8a8074;
  font-variant-numeric: tabular-nums;
}

.side-meta { padding-top: 0.5rem; }
.colophon {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.85rem;
  color: #6e6457;
  line-height: 1.6;
}


/* ===== CONTENT ================================================== */

.content {
  min-width: 0;
}


/* ----- Featured ------------------------------------------------- */

.featured {
  background: var(--highlight);
  border-left: 3px solid var(--academic);
  padding: 1.5rem 1.75rem 1.65rem;
  margin-bottom: 3rem;
  border-radius: 0 2px 2px 0;
}
.featured-eyebrow {
  font-family: var(--font-meta);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--academic);
  margin-bottom: 0.55rem;
}
.featured-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.45rem, 2.2vw, 1.85rem);
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 0.55rem;
  letter-spacing: -0.01em;
}
.featured-body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--body);
  max-width: 60ch;
  margin-bottom: 0.85rem;
}
.featured-meta {
  font-family: var(--font-meta);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: #6e6457;
}
.featured-link {
  color: var(--academic);
  font-weight: 500;
  border-bottom: 1px solid rgba(44, 82, 130, 0.3);
}
.featured-link:hover { border-bottom-color: var(--academic); }


/* ----- Catalog header ------------------------------------------- */

.catalog-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.5rem;
}
.catalog-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 0.25rem;
}
.catalog-sub {
  font-family: var(--font-meta);
  font-size: 0.78rem;
  color: #6e6457;
  letter-spacing: 0.02em;
}
.catalog-sub span { color: var(--ink); font-weight: 500; }

.view-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
  font-family: var(--font-meta);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.view-btn {
  padding: 0.4rem 0.85rem;
  color: var(--body);
  background: transparent;
  border-right: 1px solid var(--border);
}
.view-btn:last-child { border-right: 0; }
.view-btn.is-active {
  background: var(--ink);
  color: var(--paper);
}


/* ----- Entries (paper cards) ------------------------------------ */

.entries {
  margin-bottom: 2.5rem;
}

.entry {
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 0 1.25rem;
  position: relative;
  transition: background-color 200ms ease;
}
.entry:hover { background-color: rgba(44, 82, 130, 0.02); }
.entry.is-hidden { display: none; }

.entry-meta {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  align-items: flex-start;
  padding-top: 0.4rem;
}
.entry-num {
  font-family: var(--font-meta);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--academic);
  font-variant-numeric: tabular-nums;
}
.entry-year {
  font-family: var(--font-meta);
  font-size: 0.7rem;
  font-weight: 500;
  color: #8a8074;
  letter-spacing: 0.04em;
}

.entry-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.25rem, 1.8vw, 1.5rem);
  line-height: 1.25;
  color: var(--ink);
  margin-bottom: 0.4rem;
  letter-spacing: -0.005em;
}

.entry-authors {
  font-family: var(--font-meta);
  font-weight: 500;
  font-size: 0.82rem;
  color: var(--academic);
  margin-bottom: 0.7rem;
  letter-spacing: 0.01em;
}

.entry-abstract {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--body);
  max-width: 62ch;
  margin-bottom: 0.85rem;
}

.entry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.6rem;
}
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--academic);
  padding: 2px 10px;
  border-radius: 3px;
  font-family: var(--font-meta);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.entry-foot {
  font-family: var(--font-meta);
  font-size: 0.75rem;
  color: #8a8074;
  letter-spacing: 0.02em;
}
.entry-link {
  color: var(--academic);
  font-weight: 500;
  border-bottom: 1px solid transparent;
}
.entry-link:hover { border-bottom-color: var(--academic); }
.entry-link-quiet { color: #6e6457; }
.entry-link-quiet:hover { color: var(--academic); }


/* ----- Dense view ----------------------------------------------- */

.entries.is-dense .entry {
  padding: 0.85rem 0;
  grid-template-columns: 3.5rem 1fr auto;
  align-items: baseline;
}
.entries.is-dense .entry-meta { flex-direction: row; gap: 0.6rem; padding-top: 0; }
.entries.is-dense .entry-abstract,
.entries.is-dense .entry-tags,
.entries.is-dense .entry-authors { display: none; }
.entries.is-dense .entry-title {
  font-size: 1.1rem;
  margin-bottom: 0;
  font-weight: 500;
}
.entries.is-dense .entry-foot {
  font-size: 0.7rem;
  margin: 0;
  white-space: nowrap;
}


/* ----- Pagination ----------------------------------------------- */

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0 0;
  margin-bottom: 4rem;
  border-top: 1px solid var(--border);
}
.page-link {
  font-family: var(--font-meta);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--academic);
  letter-spacing: 0.02em;
  border-bottom: 0;
}
.page-link[aria-disabled="true"] {
  color: #b6ad9e;
  pointer-events: none;
}
.page-numbers {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
}
.page-num {
  font-family: var(--font-meta);
  font-size: 0.8rem;
  color: var(--academic);
  border-bottom: 0;
  font-variant-numeric: tabular-nums;
}
.page-num:hover { color: var(--ink); }
.page-num.is-active {
  color: var(--ink);
  font-weight: 600;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 1px;
}
.page-ellipsis { color: #8a8074; font-family: var(--font-meta); font-size: 0.8rem; }


/* ----- Reading sample ------------------------------------------- */

.reading {
  max-width: var(--reading-max);
  margin: 4rem auto 0;
  padding: 2.25rem 0 1rem;
  border-top: 3px double var(--border);
  font-family: var(--font-body);
  line-height: 1.85;
}
.reading-eyebrow {
  font-family: var(--font-meta);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--academic);
  margin-bottom: 0.85rem;
}
.reading-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.85rem, 3.2vw, 2.6rem);
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}
.reading-byline {
  font-family: var(--font-meta);
  font-size: 0.78rem;
  font-weight: 500;
  color: #6e6457;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
}
.reading-lede {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 500;
  font-style: italic;
  line-height: 1.45;
  color: var(--ink);
  margin: 0 0 1.5rem;
  padding-left: 1.1rem;
  border-left: 2px solid var(--academic);
  max-width: 50ch;
}
.reading p {
  margin-bottom: 1.25rem;
  color: var(--body);
}
.reading p:first-of-type::first-letter {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 3.4rem;
  line-height: 0.95;
  float: left;
  margin: 0.35rem 0.55rem 0 0;
  color: var(--ink);
}
.reading em { color: var(--ink); }
.reading-foot {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-meta);
  font-size: 0.82rem;
}
.reading-link {
  color: var(--academic);
  font-weight: 500;
  border-bottom: 1px solid rgba(44, 82, 130, 0.3);
}
.reading-link:hover { border-bottom-color: var(--academic); }


/* ===== FOOTER =================================================== */

.site-footer {
  border-top: 1px solid var(--border);
  background: #f4efe6;
  margin-top: 4rem;
}
.footer-inner {
  max-width: var(--layout-max);
  margin: 0 auto;
  padding: 3rem 2rem 1.25rem;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 2.5rem;
}
.foot-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.65rem;
}
.foot-text {
  font-family: var(--font-body);
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--body);
}
.foot-text-small { font-size: 0.82rem; color: #6e6457; font-style: italic; }
.foot-list {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-family: var(--font-meta);
  font-size: 0.82rem;
}
.foot-list a { color: var(--body); border-bottom: 0; }
.foot-list a:hover { color: var(--academic); }
.foot-bottom {
  max-width: var(--layout-max);
  margin: 0 auto;
  padding: 1.5rem 2rem 2.5rem;
  font-family: var(--font-meta);
  font-size: 0.72rem;
  color: #8a8074;
  letter-spacing: 0.06em;
  border-top: 1px solid var(--border);
}


/* ===== RESPONSIVE =============================================== */

@media (max-width: 880px) {
  .header-inner {
    grid-template-columns: auto 1fr;
    gap: 1rem;
  }
  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 1.25rem;
    padding-top: 0.4rem;
    border-top: 1px solid var(--border);
  }
  .search {
    width: 100%;
    max-width: none;
  }
  .layout {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem 1.5rem 3rem;
  }
  .sidebar {
    position: relative;
    top: 0;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    padding-right: 0;
    padding-bottom: 1.5rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem 2rem;
  }
  .side-section { margin-bottom: 1rem; }
  .side-meta { grid-column: 1 / -1; }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2.5rem 1.5rem 1rem;
  }
  .foot-bottom { padding: 1rem 1.5rem 2rem; }
}

@media (max-width: 540px) {
  .header-inner { padding: 0.85rem 1.25rem; }
  .layout { padding: 1.5rem 1.25rem 2.5rem; }
  .sidebar { grid-template-columns: 1fr; }
  .entry { grid-template-columns: 1fr; }
  .entry-meta { flex-direction: row; gap: 0.6rem; padding-top: 0; margin-bottom: 0.4rem; }
  .catalog-head { flex-direction: column; align-items: flex-start; }
  .featured { padding: 1.25rem 1.25rem 1.4rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .pagination { flex-wrap: wrap; gap: 0.75rem; }
}


/* ===== REDUCED MOTION =========================================== */

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}