@import url("https://fonts.googleapis.com/css2?family=Merriweather:wght@400;700&family=Open+Sans:wght@400;600;700&display=swap");

:root {
  --bg: #f3f8ff;
  --surface: #ffffff;
  --surface-2: #eaf1fb;
  --text: #242833;
  --muted: #657083;
  --border: rgba(36, 40, 51, 0.14);
  --link: #153f8f;
  --link-hover: #6b2aa3;
  --shadow: 0 10px 28px rgba(20, 30, 50, 0.09);
  --radius: 18px;
  --max: 1120px;
}

body.dark-mode {
  --bg: #15171c;
  --surface: #20232b;
  --surface-2: #2b303a;
  --text: #eef4ff;
  --muted: #b8c0cf;
  --border: rgba(238, 244, 255, 0.14);
  --link: #9ecbff;
  --link-hover: #ffe66d;
  --shadow: 0 10px 28px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Open Sans", Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(21, 63, 143, 0.12), transparent 32rem),
    var(--bg);
}

a {
  color: var(--link);
  font-weight: 700;
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  font-family: "Merriweather", Georgia, serif;
  line-height: 1.2;
  color: var(--text);
}

main {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 5rem;
}

/* Header */

.site-header {
  margin: 1rem auto 0;
  width: min(var(--max), calc(100% - 2rem));
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1rem;
}

.site-title a {
  font-family: "Merriweather", Georgia, serif;
  font-size: clamp(1.3rem, 4vw, 2rem);
  color: var(--text);
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.circleButton,
.menu-toggle,
.button,
.book-actions a,
.experiment-actions a,
.pagination a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text);
  padding: 0.55rem 0.85rem;
  cursor: pointer;
  font-weight: 700;
}

.circleButton {
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
}

.menu-toggle {
  display: none;
}

/* Page shells */

.home-hero,
.home-section,
.writings-index,
.experiments-index,
.about-page,
.writing,
.log,
.experiment-page {
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 3vw, 2rem);
  margin-bottom: 1.5rem;
}

.lede {
  font-size: 1.12rem;
  color: var(--muted);
}

.meta,
.eyebrow {
  color: var(--muted);
  font-size: 0.9rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
}

/* Cards and grids */

.log-list,
.card-grid,
.experiment-grid,
.featured-experiments {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.log-card,
.experiment-card,
.writing-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.log-card:hover,
.experiment-card:hover,
.writing-card:hover {
  transform: translateY(-2px);
}

.log-card h2,
.experiment-card h2,
.writing-card h3 {
  margin-top: 0;
  margin-bottom: 0.6rem;
}

.log-card p,
.experiment-card p {
  color: var(--muted);
}

.experiment-card {
  display: flex;
  flex-direction: column;
}

.experiment-card p {
  flex: 1;
}

.experiment-actions,
.book-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: auto;
  padding-top: 1rem;
}

/* Tags */

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}

.tag-list li {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.65rem;
  color: var(--muted);
  background: var(--surface-2);
}

/* Writing pages */

.writing {
  max-width: 100%;
}

.writing-header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
}

.writing-content {
  font-size: 1.05rem;
}

.writing-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.25rem 0 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.writing-tabs a {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
  padding: 0.35rem 0.7rem;
  color: var(--text);
}

.writing-tabs a:hover {
  color: var(--link-hover);
  text-decoration: none;
}


.writing-section > summary,
.writing-series > summary {
  cursor: pointer;
  font-family: "Merriweather", Georgia, serif;
  font-weight: 700;
}

.writing-section > summary {
  font-size: 1.45rem;
}


.writing-series > summary {
  font-size: 1.05rem;
  color: var(--muted);
}

.series-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.series-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
}

.series-nav a span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 400;
}

.series-nav-next {
  text-align: right;
  align-items: flex-end;
}

/* Book feature */

.book-feature {
  display: grid;
  grid-template-columns: minmax(160px, 260px) 1fr;
  gap: 1.5rem;
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.book-cover {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

/* Pagination and back links */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 2rem auto 0;
  text-align: center;
  color: var(--muted);
  flex-wrap: wrap;
}

.pagination a:hover {
  color: var(--link-hover);
  text-decoration: none;
  transform: translateY(-1px);
}

.back-link {
  margin: 0 0 1rem;
}

.back-link a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--muted);
}

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

/* Log navigation */

.log-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.log-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
}

.log-nav a span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 400;
}

.log-nav-newer {
  text-align: left;
}

.log-nav-older {
  text-align: right;
  align-items: flex-end;
}

/* Footer */

.page-footer {
  width: min(var(--max), calc(100% - 2rem));
  margin: 2rem auto;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.kofi-logo {
  width: auto;
  height: 2.5em;
}

/* Responsive */

@media (max-width: 700px) {
  .log-nav {
    flex-direction: column;
  }

  .log-nav-older {
    align-items: flex-start;
    text-align: left;
  }
}

@media (max-width: 760px) {
  .header-inner {
    position: relative;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 0.75rem);
    right: 0;
    z-index: 10;
    min-width: 220px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1rem;
  }

  .site-nav.open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
  }

  .book-feature {
    grid-template-columns: 1fr;
  }
}

/* Writings index */

.writing-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.25rem 0 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.writing-tabs a {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
  padding: 0.35rem 0.7rem;
  color: var(--text);
}

.writing-tabs a:hover {
  color: var(--link-hover);
  text-decoration: none;
}

.writing-section {
  margin: 1rem 0 0;
  border-top: 1px solid var(--border);
  padding: 0.75rem 0 0;
}

.writing-section > summary,
.writing-series > summary {
  cursor: pointer;
  font-family: "Merriweather", Georgia, serif;
  font-weight: 700;
  margin: 0;
  padding: 0;
  line-height: 1.2;
}

.writing-section > summary {
  font-size: 1.45rem;
}

.writing-series {
  margin: 0.75rem 0 0;
  padding: 0;
}

.writing-series > summary {
  font-size: 1.05rem;
  color: var(--muted);
}

.writing-card-list {
  display: grid;
  gap: 0.75rem;
  margin: 0.75rem 0 0;
  padding: 0;
}

.writing-card {
  margin: 0;
  padding: 1rem;
}

.writing-card h3,
.writing-card p {
  margin-top: 0;
}

.writing-card p:last-child {
  margin-bottom: 0;
}

.log-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.log-header h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
}

.log-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.log-date {
  opacity: 0.9;
}

.log-content {
  line-height: 1.8;
  font-size: 1.05rem;
}

.log-content > *:first-child {
  margin-top: 0;
}

.log-content > *:last-child {
  margin-bottom: 0;
}

.log-content h2,
.log-content h3,
.log-content h4 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.log-content p,
.log-content ul,
.log-content ol,
.log-content blockquote,
.log-content pre {
  margin-bottom: 1.25rem;
}

.log-content blockquote {
  border-left: 3px solid var(--border);
  padding-left: 1rem;
  color: var(--muted);
  font-style: italic;
}

.log-content img {
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius) * 0.75);
  border: 1px solid var(--border);
}

.log-content code {
  background: rgba(255,255,255,0.06);
  padding: 0.15rem 0.35rem;
  border-radius: 0.35rem;
  font-size: 0.95em;
}

.log-content pre {
  overflow-x: auto;
  padding: 1rem;
  border-radius: var(--radius);
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--border);
}