/* ============================================================
   COMPONENTS — All reusable UI components
   ============================================================ */

/* ── Divider ─────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: var(--border-width) solid var(--color-text-3);
  opacity: 0.35;
  margin: var(--s-6) 0;
}

.divider--sm  { margin: var(--s-4) 0; }
.divider--lg  { margin: var(--s-8) 0; }

/* Dark mode: lift divider visibility */
html[data-theme="dark"] .divider,
:root:not([data-theme]) .divider {
  opacity: 0.55;
}

/* ── Filter bar  (Projects / Writing / Research) ─────────── */
.filter-bar {
  display: flex;
  gap: var(--s-5);
  margin-bottom: var(--s-6);
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-3);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  padding-bottom: 3px;
  border-bottom: 1.5px solid transparent;
  transition: color var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out);
}

.filter-btn:hover { color: var(--color-text-2); }

.filter-btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  font-weight: 500;
}

/* ── Content list — flat rows ─────────────────────────────── */
.content-list {
  display: flex;
  flex-direction: column;
}

.content-list-item {
  display: grid;
  grid-template-columns: 6.5rem 1fr auto;
  align-items: baseline;
  gap: var(--s-4);
  padding: var(--s-4) 0;
  border-top: var(--border-width) solid var(--color-border);
  text-decoration: none;
  color: var(--color-text-1);
  transition: transform var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out);
}

.content-list-item:last-child {
  border-bottom: var(--border-width) solid var(--color-border);
}

.content-list-item:hover {
  transform: translateX(4px);
}

.content-list-item:hover .item-title {
  color: var(--color-accent);
}

.item-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-3);
  white-space: nowrap;
  line-height: var(--leading-relaxed);
}

.item-title {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  color: var(--color-text-1);
  line-height: var(--leading-snug);
  transition: color var(--t-fast) var(--ease-out);
}

.item-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-3);
  letter-spacing: 0.03em;
  white-space: nowrap;
  line-height: var(--leading-relaxed);
}

/* ── Tags — inline dot-separated ─────────────────────────── */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1);
  margin-top: var(--s-2);
}

.tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-3);
  letter-spacing: 0.03em;
}

.tag + .tag::before {
  content: '·';
  margin-right: var(--s-1);
  color: var(--color-border);
}

/* ── Section header row ──────────────────────────────────── */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--s-4);
}

/* ── Project items ───────────────────────────────────────── */
.project-item {
  padding: var(--s-5) 0;
  border-top: var(--border-width) solid var(--color-border);
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out);
}

.project-item:last-child {
  border-bottom: var(--border-width) solid var(--color-border);
}

.project-item:hover,
.project-item:focus-within {
  transform: translateX(4px);
}

.project-item:hover .project-title,
.project-item:focus-within .project-title {
  color: var(--color-accent);
}

.project-header-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--s-2);
  gap: var(--s-4);
}

.project-title {
  font-family: var(--font-serif);
  font-size: var(--text-md);
  line-height: var(--leading-snug);
  color: var(--color-text-1);
  transition: color var(--t-fast) var(--ease-out);
}

.project-year {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-3);
  white-space: nowrap;
  flex-shrink: 0;
}

.project-desc {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-text-2);
  line-height: var(--leading-normal);
  margin-bottom: var(--s-2);
  max-width: 58ch;
}

.project-links {
  display: flex;
  gap: var(--s-4);
  margin-top: var(--s-3);
  align-items: center;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out);
}

.project-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-link-underline);
}

.project-link svg {
  width: 13px;
  height: 13px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ── Research items ──────────────────────────────────────── */
.research-item {
  padding: var(--s-5) 0;
  border-top: var(--border-width) solid var(--color-border);
}

.research-item:last-child {
  border-bottom: var(--border-width) solid var(--color-border);
}

.research-title {
  font-family: var(--font-serif);
  font-size: var(--text-md);
  line-height: var(--leading-snug);
  color: var(--color-text-1);
  margin-bottom: var(--s-2);
  transition: color var(--t-fast) var(--ease-out);
}

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

.research-venue {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--text-sm);
  color: var(--color-text-2);
  margin-bottom: var(--s-2);
}

.research-status {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.status--published { color: var(--color-accent); }
.status--review    { color: var(--color-text-2); }
.status--wip       { color: var(--color-text-3); }

/* ── Book list ───────────────────────────────────────────── */
.book-list { display: flex; flex-direction: column; }

.book-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--s-4);
  padding: var(--s-4) 0;
  border-top: var(--border-width) solid var(--color-border);
  align-items: start;
}

.book-item:last-child {
  border-bottom: var(--border-width) solid var(--color-border);
}

.book-cover {
  width: 44px;
  height: 60px;
  background-color: var(--color-border);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface);
}

.book-cover-placeholder svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-text-3);
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.book-title {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  color: var(--color-text-1);
  line-height: var(--leading-snug);
  margin-bottom: 2px;
}

.book-author {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-3);
  margin-bottom: var(--s-2);
}

.book-note {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--text-sm);
  color: var(--color-text-2);
  line-height: var(--leading-normal);
}

.book-rating {
  font-size: 10px;
  color: var(--color-accent);
  margin-top: var(--s-1);
  letter-spacing: 1px;
}

/* ── Collection items (papers, blogs, tools) ──────────────── */
.collection-item {
  padding: var(--s-4) 0;
  border-top: var(--border-width) solid var(--color-border);
}

.collection-item:last-child {
  border-bottom: var(--border-width) solid var(--color-border);
}

.collection-item-title {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  color: var(--color-text-1);
  margin-bottom: var(--s-1);
  transition: color var(--t-fast) var(--ease-out);
}

.collection-item-title a:hover { color: var(--color-accent); }

.collection-item-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-3);
  margin-bottom: var(--s-1);
}

.collection-item-note {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: var(--text-sm);
  color: var(--color-text-2);
}

/* ── Sub-nav (Collection page) ───────────────────────────── */
.sub-nav {
  display: flex;
  gap: var(--s-5);
  flex-wrap: wrap;
  border-bottom: var(--border-width) solid var(--color-border);
  margin-bottom: var(--s-6);
  padding-bottom: var(--s-1);
}

.sub-nav-btn {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-3);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0 0 var(--s-3);
  margin-bottom: -1px;
  border-bottom: 2px solid transparent;
  transition: color var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out);
}

.sub-nav-btn:hover { color: var(--color-text-1); }

.sub-nav-btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  font-weight: 500;
}

/* ── Links page rows ─────────────────────────────────────── */
.links-list { display: flex; flex-direction: column; }

.link-row {
  display: grid;
  grid-template-columns: 20px 130px 1fr 16px;
  align-items: center;
  gap: var(--s-4);
  padding: var(--s-4) 0;
  border-top: var(--border-width) solid var(--color-border);
  text-decoration: none;
  color: var(--color-text-1);
  transition: transform var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out);
}

.link-row:last-child {
  border-bottom: var(--border-width) solid var(--color-border);
}

.link-row:hover {
  transform: translateX(4px);
}

.link-row:hover .link-row__name {
  color: var(--color-accent);
}

.link-row__icon {
  color: var(--color-text-3);
  display: flex;
  align-items: center;
}

.link-row__icon svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.link-row__name {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--t-fast) var(--ease-out);
}

.link-row__url {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.link-row__ext {
  color: var(--color-text-3);
  opacity: 0;
  transition: opacity var(--t-fast) var(--ease-out);
  display: flex;
  align-items: center;
}

.link-row:hover .link-row__ext { opacity: 1; }

.link-row__ext svg {
  width: 11px;
  height: 11px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
}

/* ── Uses items ──────────────────────────────────────────── */
.uses-section { margin-bottom: var(--s-8); }

.uses-list { display: flex; flex-direction: column; }

.uses-row {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: var(--s-4);
  padding: var(--s-3) 0;
  border-top: var(--border-width) solid var(--color-border);
  align-items: baseline;
}

.uses-row:last-child {
  border-bottom: var(--border-width) solid var(--color-border);
}

.uses-row__name {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-1);
}

.uses-row__desc {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-text-2);
}

/* ── Metadata strip (About) ──────────────────────────────── */
.meta-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-5) var(--s-6);
  padding: var(--s-5) 0;
  border-top: var(--border-width) solid var(--color-border);
  border-bottom: var(--border-width) solid var(--color-border);
  margin: var(--s-6) 0;
}

.meta-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-3);
  display: block;
  margin-bottom: var(--s-1);
}

.meta-value {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-text-1);
  line-height: var(--leading-normal);
}

/* ── Contact items ───────────────────────────────────────── */
.contact-list { display: flex; flex-direction: column; }

.contact-row {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-4) 0;
  border-top: var(--border-width) solid var(--color-border);
}

.contact-row:last-child {
  border-bottom: var(--border-width) solid var(--color-border);
}

.contact-row__icon {
  color: var(--color-text-3);
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.contact-row__icon svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.contact-row__text {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-1);
}

.contact-row__text a {
  color: var(--color-accent);
  transition: color var(--t-fast) var(--ease-out);
}

.contact-row__text a:hover { color: var(--color-accent-h); }

/* ── Illustrations ───────────────────────────────────────── */
.illustration {
  opacity: 0.8;
}

.illustration svg {
  stroke: var(--color-text-1);
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  overflow: visible;
}

/* ── Page-with-illustration grid ────────────────────────── */
.layout-with-illus {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: var(--s-8);
  align-items: start;
}

@media (max-width: 820px) {
  .layout-with-illus {
    grid-template-columns: 1fr;
  }
  .layout-with-illus .illustration {
    display: none;
  }
}

/* ── Responsive Uses grid ────────────────────────────────── */
@media (max-width: 540px) {
  .uses-row {
    grid-template-columns: 1fr;
    gap: var(--s-1);
  }

  .link-row {
    grid-template-columns: 20px 1fr 14px;
  }

  .link-row__url {
    display: none;
  }

  .meta-strip {
    grid-template-columns: 1fr;
  }

  .content-list-item {
    grid-template-columns: 5rem 1fr;
  }

  .item-tag {
    display: none;
  }
}

/* ── Theme swatches (ink tablet picker) ─────────────────── */
.theme-swatches {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-swatch {
  position: relative;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1.5px solid var(--swatch-border, #ccc);
  background-color: var(--swatch-color, #ccc);
  cursor: pointer;
  padding: 0;
  transition: transform var(--t-fast) var(--ease-out),
              outline-offset var(--t-fast) var(--ease-out);
  outline: 2px solid transparent;
  outline-offset: 0px;
}

/* Expand touch target to WCAG 2.1 AAA conformant 44px on mobile/touch screens */
.theme-swatch::after {
  content: "";
  position: absolute;
  top: -14px;
  left: -14px;
  right: -14px;
  bottom: -14px;
}

.theme-swatch:hover {
  transform: scale(1.35);
}

.theme-swatch:focus-visible {
  outline: 2px solid var(--color-text-1);
  outline-offset: 3px;
}

.theme-swatch.active {
  outline: 2px solid var(--color-text-1);
  outline-offset: 2.5px;
  transform: none;
}

@media (max-width: 1023px) {
  .theme-swatches {
    position: fixed;
    top: auto;
    bottom: 16px;
    right: 16px;
    z-index: 1000;
    background-color: var(--color-surface);
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: 30px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }
}

/* ── Inline RSS Links ────────────────────────────────────── */
.page-title-row {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  margin-bottom: var(--s-2);
}

.rss-link-inline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-3);
  transition: color var(--t-fast) var(--ease-out);
  padding: 4px;
}

.rss-link-inline:hover {
  color: var(--color-accent);
}

.rss-icon-inline {
  width: 18px;
  height: 18px;
}

/* ============================================================
   DARK MODE — Lifted border states (:hover / :focus-visible)
   Borders brighten on interaction for better affordance.
   ============================================================ */
html[data-theme="dark"] .content-list-item:hover,
html[data-theme="dark"] .content-list-item:focus-visible,
html[data-theme="dark"] .project-item:hover,
html[data-theme="dark"] .project-item:focus-visible,
html[data-theme="dark"] .link-row:hover,
html[data-theme="dark"] .link-row:focus-visible,
html[data-theme="dark"] .uses-row:hover,
html[data-theme="dark"] .uses-row:focus-visible,
html[data-theme="dark"] .book-item:hover,
html[data-theme="dark"] .book-item:focus-visible,
html[data-theme="dark"] .collection-item:hover,
html[data-theme="dark"] .collection-item:focus-visible,
html[data-theme="dark"] .contact-row:hover,
html[data-theme="dark"] .contact-row:focus-visible,
html[data-theme="dark"] .research-item:hover,
html[data-theme="dark"] .research-item:focus-visible {
  border-color: #444444;
}

/* Same for prefers-color-scheme auto dark */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .content-list-item:hover,
  :root:not([data-theme]) .content-list-item:focus-visible,
  :root:not([data-theme]) .project-item:hover,
  :root:not([data-theme]) .project-item:focus-visible,
  :root:not([data-theme]) .link-row:hover,
  :root:not([data-theme]) .link-row:focus-visible,
  :root:not([data-theme]) .uses-row:hover,
  :root:not([data-theme]) .uses-row:focus-visible,
  :root:not([data-theme]) .book-item:hover,
  :root:not([data-theme]) .book-item:focus-visible,
  :root:not([data-theme]) .collection-item:hover,
  :root:not([data-theme]) .collection-item:focus-visible,
  :root:not([data-theme]) .contact-row:hover,
  :root:not([data-theme]) .contact-row:focus-visible,
  :root:not([data-theme]) .research-item:hover,
  :root:not([data-theme]) .research-item:focus-visible {
    border-color: #444444;
  }
}

/* Dark mode: gallery card wrapper border lift */
html[data-theme="dark"] .gallery-item__wrapper,
:root:not([data-theme]) .gallery-item__wrapper {
  border-color: #333333;
}

/* Dark mode: sidebar & panel borders slightly brighter */
html[data-theme="dark"] .sidebar,
html[data-theme="dark"] .right-panel,
html[data-theme="dark"] .mobile-header,
html[data-theme="dark"] .sidebar__footer,
html[data-theme="dark"] .sidebar__divider {
  border-color: #2e2e2e;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .sidebar,
  :root:not([data-theme]) .right-panel,
  :root:not([data-theme]) .mobile-header,
  :root:not([data-theme]) .sidebar__footer,
  :root:not([data-theme]) .sidebar__divider {
    border-color: #2e2e2e;
  }
}

/* Dark mode: meta-strip border lift */
html[data-theme="dark"] .meta-strip {
  border-color: #333333;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .meta-strip {
    border-color: #333333;
  }
}

/* Dark mode: sub-nav bottom border lift */
html[data-theme="dark"] .sub-nav {
  border-bottom-color: #333333;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .sub-nav {
    border-bottom-color: #333333;
  }
}

/* Dark mode: focus-visible outline for keyboard nav */
html[data-theme="dark"] a:focus-visible,
html[data-theme="dark"] button:focus-visible {
  outline: 1px solid #555555;
  outline-offset: 2px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) a:focus-visible,
  :root:not([data-theme]) button:focus-visible {
    outline: 1px solid #555555;
    outline-offset: 2px;
  }
}