* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: 3.5rem; /* space for fixed nav */
  background: var(--color-bg);
  color: var(--color-text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

a {
  color: var(--color-primary);
}

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

img {
  max-width: 100%;
  display: block;
}

/* --- Fixed top nav --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0 1.5rem;
  background: var(--color-primary);
  z-index: 10;
}

.site-nav .brand {
  color: #fff;
  font-weight: bold;
  text-decoration: none;
}

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

.site-nav a {
  color: #fff;
  text-decoration: none;
}

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

/* Checkbox-hack toggle: hidden checkbox + label, no JS. Hamburger only
   shows up under the media query below; desktop keeps the plain row. */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  margin-left: auto;
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

@media (max-width: 640px) {
  .nav-toggle-label {
    display: block;
  }

  .site-nav ul {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 3.5rem;
    left: 0;
    right: 0;
    padding: 0.5rem 0;
    background: var(--color-primary);
  }

  .site-nav ul li {
    padding: 0.5rem 1.5rem;
  }

  .nav-toggle:checked ~ ul {
    display: flex;
  }
}

/* --- Scrollable content container --- */
.site-content {
  flex: 1 0 auto;       /* grows to fill the viewport, pushing the footer down */
  width: 100%;
  max-width: 60rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

/* --- Footer --- */
.site-footer {
  flex-shrink: 0;        /* stays pinned at the bottom on short pages */
  padding: 1.5rem;
  text-align: center;
  color: var(--color-primary-light);
  font-size: 0.9rem;
}

/* --- Home page banner + books --- */
.banner {
  margin-bottom: 2rem;
}

.books-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

@media (max-width: 640px) {
  .books-row {
    grid-template-columns: 1fr;
  }
}

.book-panel {
  border: 1px solid var(--color-primary-light);
  border-radius: 0.5rem;
  padding: 1rem;
}

.book-panel .label {
  color: var(--color-accent);
  font-weight: bold;
  font-size: 0.85rem;
}

/* --- Blog panels (100% width) --- */
.blog-panel {
  width: 100%;
  border-bottom: 1px solid var(--color-primary-light);
  padding: 1.5rem 0;
}

/* Tag view: date + content-type badge on one line (mirrors
   .project-card-meta), since a tag page mixes blog/projects/marbles. */
.blog-panel-meta {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
}

.blog-panel-type {
  color: var(--color-primary-light);
  font-size: 0.9rem;
  text-transform: capitalize;
}

.blog-panel-date {
  color: var(--color-primary-light);
  font-size: 0.9rem;
}

/* List panels (marbles/projects/books): image sits beside the text,
   sized to 40% of the panel, text taking the rest. */
.project-card-body,
.book-panel-body {
  display: grid;
  grid-template-columns: 40% 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* Blog preview panel: image at 30%. */
.blog-panel-body {
  display: grid;
  grid-template-columns: 30% 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* Blog post detail page: image at 45%. */
.blog-post-header {
  display: grid;
  grid-template-columns: 45% 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* Projects detail page: image and description side by side, image at 30%. */
.project-post-header {
  display: grid;
  grid-template-columns: 30% 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 640px) {
  .blog-panel-body,
  .blog-post-header,
  .project-card-body,
  .book-panel-body,
  .project-post-header {
    grid-template-columns: 1fr;
  }
}

.blog-panel-tags,
.blog-post-tags,
.project-card-tags,
.project-post-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 0.75rem 0 0;
}

.blog-panel-tags li a,
.blog-post-tags li a,
.project-card-tags li a,
.project-post-tags li a {
  display: inline-block;
  background: var(--color-primary-light);
  color: #fff;
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  font-size: 0.8rem;
  text-decoration: none;
}

.pagination {
  display: flex;
  justify-content: space-between;
  margin-top: 1.5rem;
}

/* --- Project grid (2-up, collapsing to 1-up) --- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

@media (max-width: 640px) {
  .project-grid {
    grid-template-columns: 1fr;
  }
}

.project-card {
  border: 1px solid var(--color-primary-light);
  border-radius: 0.5rem;
  padding: 1rem;
}

.project-card-meta,
.project-post-meta {
  display: flex;
  gap: 0.75rem;
  color: var(--color-primary-light);
  font-size: 0.9rem;
}

.project-card-category,
.project-post-category {
  text-transform: capitalize;
  color: var(--color-accent);
}

/* --- Under construction / not found --- */
.under-construction,
.not-found {
  text-align: center;
  padding: 3rem 0;
}

/* --- Marble post detail page (mirrors the old site's layout) --- */
.marble-post-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.marble-post-byline {
  color: var(--color-primary-light);
  font-size: 0.9rem;
}

.marble-post-summary {
  display: grid;
  grid-template-columns: 1fr 1fr; /* details left, image right */
  gap: 1.5rem;
  align-items: start;
  margin-bottom: 1.5rem;
}

@media (max-width: 640px) {
  .marble-post-summary {
    grid-template-columns: 1fr;
  }
}

.marble-post-video {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.marble-post-video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}