/*
 * Nano CMS - frontend default stylesheet (nano.css)
 *
 * Neutral starter, not a design system. Drops in on top of any host
 * site - every selector is scoped under .nano-blog so the host's own
 * chrome (header, nav, footer) is never touched.
 *
 * THEMING CONTRACT
 *   Override any of the custom properties below in a small
 *   theme-custom.css to re-theme the blog without editing this file.
 *   See template.php for how to wire the optional theme file in.
 *
 *     --nano-font-family       Inter (loaded in template.php), system fallback
 *     --nano-font-size-base    Body font size
 *     --nano-line-height       Body line height
 *     --nano-color-text        Primary text color
 *     --nano-color-text-muted  Dates, descriptions, secondary text
 *     --nano-color-bg          Page/card background
 *     --nano-color-border      Card and divider borders
 *     --nano-color-accent      Links and hover highlights
 *     --nano-content-width     Max width of the blog area
 *     --nano-spacing-unit      Base spacing rhythm
 *     --nano-radius            Corner radius on cards, code, images
 *     --nano-card-gap          Vertical space between listing cards
 *     --nano-card-padding      Internal padding on listing cards
 *
 * Includes a prefers-color-scheme: dark override at the bottom.
 */

.nano-blog {
  --nano-font-family: "Inter", system-ui, sans-serif;
  --nano-font-size-base: 1.05rem;
  --nano-line-height: 1.65;
  --nano-color-text: #1a1a1a;
  --nano-color-text-muted: #666;
  --nano-color-bg: #ffffff;
  --nano-color-bg-soft: #f6f8fa;
  --nano-color-border: #e5e5e5;
  --nano-color-border-soft: #efefef;
  --nano-color-accent: #0066cc;
  --nano-color-link-hover: #999999;
  --nano-content-width: 1100px;
  --nano-spacing-unit: 1rem;
  --nano-radius: 6px;
  --nano-card-gap: 1.5rem;
  --nano-card-padding: 1.5rem;

  font-family: var(--nano-font-family);
  font-size: var(--nano-font-size-base);
  line-height: var(--nano-line-height);
  color: var(--nano-color-text);
  background: var(--nano-color-bg);
  max-width: var(--nano-content-width);
  margin: 0 auto;
  padding: calc(var(--nano-spacing-unit) * 2) var(--nano-spacing-unit);
  box-sizing: border-box;
}

.nano-blog *,
.nano-blog *::before,
.nano-blog *::after { box-sizing: inherit; }

/* Headings */
.nano-blog h1,
.nano-blog h2,
.nano-blog h3,
.nano-blog h4 {
  line-height: 1.25;
  margin: calc(var(--nano-spacing-unit) * 1.5) 0 var(--nano-spacing-unit);
  color: var(--nano-color-text);
}
.nano-blog h1 { font-size: 2.5rem; font-weight: 700; line-height: 1.1; letter-spacing: -0.02em; }
.nano-blog h2 { font-size: 1.5rem; }
.nano-blog h3 { font-size: 1.25rem; }
.nano-blog h4 { font-size: 1.1rem; }
.nano-blog > h1:first-child,
.nano-blog-content > *:first-child { margin-top: 0; }

/* Body text */
.nano-blog p,
.nano-blog ul,
.nano-blog ol,
.nano-blog blockquote,
.nano-blog pre,
.nano-blog figure { margin: 0 0 var(--nano-spacing-unit) 0; }
.nano-blog ul,
.nano-blog ol { padding-left: 1.5em; }
.nano-blog li + li { margin-top: 0.25em; }
.nano-blog blockquote {
  border-left: 3px solid var(--nano-color-border);
  padding: 0 var(--nano-spacing-unit);
  color: var(--nano-color-text-muted);
}
.nano-blog a {
  color: var(--nano-color-accent);
  text-decoration: none;
}
.nano-blog a:hover { color: var(--nano-color-link-hover); }
.nano-blog strong { font-weight: 600; }
.nano-blog em { font-style: italic; }
.nano-blog hr {
  border: 0;
  border-top: 1px solid var(--nano-color-border);
  margin: calc(var(--nano-spacing-unit) * 2) 0;
}

/* Code */
.nano-blog code,
.nano-blog pre {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
}
.nano-blog code {
  background: rgba(0, 0, 0, 0.05);
  padding: 0.1em 0.35em;
  border-radius: var(--nano-radius);
}
.nano-blog pre {
  background: rgba(0, 0, 0, 0.05);
  padding: var(--nano-spacing-unit);
  border-radius: var(--nano-radius);
  overflow-x: auto;
}
.nano-blog pre code { background: none; padding: 0; }

/* Images */
.nano-blog img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--nano-radius);
}

/* Listing (index and category archive) */
.nano-blog-list h1 { margin-bottom: calc(var(--nano-spacing-unit) * 2); }

/* Shared grid for both category cards (homepage) and article cards
 * (category archive). Column count is set inline by index.php from
 * the cards_per_row config value (3 or 4). */
.nano-blog-grid {
  display: grid;
  grid-template-columns: repeat(var(--nano-cards-per-row, 3), 1fr);
  gap: var(--nano-card-gap);
}
@media (max-width: 900px) {
  .nano-blog-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .nano-blog-grid { grid-template-columns: 1fr; }
}

.nano-blog-card {
  border: 1px solid var(--nano-color-border);
  border-radius: var(--nano-radius);
  background: var(--nano-color-bg);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.nano-blog-card:hover {
  box-shadow: 0 12px 28px rgba(0,0,0,0.12), 0 4px 10px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.nano-blog-card a {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: inherit;
}
.nano-blog-card img {
  display: block;
  width: 100%;
  aspect-ratio: var(--nano-thumb-aspect, 3 / 2);
  object-fit: cover;
  object-position: 50% 35%;
  border-radius: var(--nano-radius) var(--nano-radius) 0 0;
}
.nano-blog-card-text {
  padding: var(--nano-card-padding);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.nano-blog-card h2 {
  margin: 0 0 0.5em 0;
  font-size: 1.25rem;
  line-height: 1.3;
}
.nano-blog-card a:hover h2 { color: var(--nano-color-link-hover); }
.nano-blog-card time {
  display: block;
  color: var(--nano-color-text-muted);
  font-size: 0.8125rem;
  margin-bottom: 0.5em;
  letter-spacing: 0.01em;
}
.nano-blog-card p {
  margin: 0;
  color: var(--nano-color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.55;
}

/* Single post */
.nano-blog-post header { margin-bottom: calc(var(--nano-spacing-unit) * 2); }
.nano-blog-post h1 { margin: 0 0 0.5em 0; }
.nano-blog-post time {
  color: var(--nano-color-text-muted);
  font-size: 0.875em;
}
.nano-blog-category {
  margin: 0.5em 0 0 0;
  color: var(--nano-color-text-muted);
  font-size: 0.875em;
}
.nano-blog-category a { color: inherit; }
.nano-blog-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.75rem 0;
  padding: 0.85rem 1.25rem;
  font-size: 0.875rem;
  color: var(--nano-color-text-muted);
  background: var(--nano-color-bg-soft);
  border: 1px solid var(--nano-color-border);
  border-radius: var(--nano-radius);
}
.nano-blog-breadcrumb a {
  color: var(--nano-color-text-muted);
  text-decoration: none;
}
.nano-blog-breadcrumb a:hover { color: var(--nano-color-text); text-decoration: underline; }
.nano-blog-breadcrumb span[aria-hidden] { margin: 0; color: var(--nano-color-border); opacity: 1; }

/* Section sub-nav: an "All" link plus one per category, shown above each page's heading. */
.nano-blog-subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.75rem 0;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--nano-color-border);
}
.nano-blog-subnav a {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--nano-color-border);
  border-radius: var(--nano-radius);
  background: var(--nano-color-bg-soft);
  color: var(--nano-color-text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
}
.nano-blog-subnav a:hover {
  color: var(--nano-color-text);
  border-color: var(--nano-color-accent);
}
.nano-blog-subnav a.is-active {
  color: #fff;
  background: var(--nano-color-accent);
  border-color: var(--nano-color-accent);
}
@media (max-width: 600px) {
  .nano-blog-subnav { flex-wrap: nowrap; overflow-x: auto; }
}

/* Category page header: banner image + description, side by side on wide
   screens with the image on the left (or right) - ported from Cart's
   category header. */
.nano-blog-category-header { display: grid; grid-template-columns: 1fr; gap: 1.5rem; margin-bottom: 2rem; padding-bottom: 2rem; border-bottom: 1px solid var(--nano-color-border); }
.nano-blog-category-banner { margin: 0; border: 1px solid var(--nano-color-border); border-radius: var(--nano-radius); box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08); overflow: hidden; }
.nano-blog-category-banner img { display: block; width: 100%; height: auto; }
.nano-blog-category-description { color: var(--nano-color-text); align-self: start; }
.nano-blog-category-description p:first-child { margin-top: 0; }
.nano-blog-category-description p:last-child { margin-bottom: 0; }
@media (min-width: 768px) {
  .nano-blog-category-header.has-banner { grid-template-columns: 320px 1fr; gap: 2rem; }
  .nano-blog-category-header.has-banner.nano-blog-image-right .nano-blog-category-banner { order: 2; }
}

/* Single-post lead image: full image at natural size (capped to the content
   column), no fixed-height box and no crop - mirrors Cart's gallery-main. */
.nano-blog-figure { margin: 0 0 calc(var(--nano-spacing-unit) * 1.5) 0; }
.nano-blog-figure img { max-width: 100%; height: auto; display: block; border: 1px solid var(--nano-color-border); box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08); }

/* Homepage hero article + section headings. */
.nano-blog-section { margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--nano-color-border-soft); }
.nano-blog-section-title { font-size: 1.75rem; font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 1.25rem; color: var(--nano-color-text); }
.nano-blog-hero { display: block; color: inherit; text-decoration: none; border: 1px solid var(--nano-color-border); border-radius: var(--nano-radius); overflow: hidden; box-shadow: 0 1px 2px rgba(0,0,0,0.04); transition: box-shadow 0.25s ease, transform 0.25s ease; margin-bottom: calc(var(--nano-spacing-unit) * 2); }
.nano-blog-hero:hover { box-shadow: 0 12px 28px rgba(0,0,0,0.12), 0 4px 10px rgba(0,0,0,0.06); transform: translateY(-2px); }
.nano-blog-hero img { width: 100%; aspect-ratio: var(--nano-thumb-aspect, 3 / 2); object-fit: cover; object-position: 50% 35%; display: block; }
.nano-blog-hero-body { padding: calc(var(--nano-card-padding) * 1.25); background: var(--nano-color-bg-soft); }
.nano-blog-hero-body h2 { margin: 0 0 0.25em; font-size: 1.6rem; }
.nano-blog-hero-body time { color: var(--nano-color-text-muted); font-size: 0.8125rem; }
.nano-blog-hero-body p { color: var(--nano-color-text-muted); margin: 0.5em 0 0; }
@media (min-width: 700px) {
  .nano-blog-hero.has-image { display: grid; grid-template-columns: 1.4fr 1fr; }
  .nano-blog-hero.has-image img { height: 100%; aspect-ratio: auto; }
  .nano-blog-hero-body { display: flex; flex-direction: column; justify-content: center; }
}
.nano-blog-hero { margin: 0 0 calc(var(--nano-spacing-unit) * 2) 0; }
.nano-blog-draft-banner {
  background: #fff8c4;
  color: #5a4500;
  border: 1px solid #e6d484;
  padding: 0.5em var(--nano-spacing-unit);
  border-radius: var(--nano-radius);
  font-weight: 600;
  font-size: 0.875em;
  letter-spacing: 0.05em;
  margin-top: var(--nano-spacing-unit);
}

/* Category card (homepage). Visual treatment matches .nano-blog-card. */
.nano-blog-category-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 9rem;
  border: 1px solid var(--nano-color-border);
  border-radius: var(--nano-radius);
  background: var(--nano-color-bg);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
  color: inherit;
  overflow: hidden;
}
.nano-blog-category-card:hover {
  box-shadow: 0 12px 28px rgba(0,0,0,0.12), 0 4px 10px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.nano-blog-category-card img {
  display: block;
  width: 100%;
  aspect-ratio: var(--nano-thumb-aspect, 3 / 2);
  object-fit: cover;
  object-position: 50% 35%;
  border-radius: var(--nano-radius) var(--nano-radius) 0 0;
}
.nano-blog-category-card-text {
  padding: calc(var(--nano-card-padding) * 1.25) var(--nano-card-padding);
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.nano-blog-category-card h2 {
  margin: 0 0 0.5em 0;
  font-size: 1.375rem;
  line-height: 1.25;
}
.nano-blog-category-card:hover h2 { color: var(--nano-color-link-hover); }
.nano-blog-category-count {
  margin: 0;
  color: var(--nano-color-text-muted);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

/* Pagination */
.nano-blog-pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--nano-spacing-unit);
  margin-top: calc(var(--nano-spacing-unit) * 2);
}
.nano-blog-pagination span {
  color: var(--nano-color-text-muted);
  font-size: 0.875em;
}
.nano-blog-pagination a {
  color: var(--nano-color-accent);
  text-decoration: none;
}
.nano-blog-pagination a:hover { color: var(--nano-color-link-hover); }

/* Video shortcode (responsive 16:9) */
.nano-blog-video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin: 0 0 var(--nano-spacing-unit) 0;
  border-radius: var(--nano-radius);
  overflow: hidden;
}
.nano-blog-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Footer attribution (rendered iff the site is unlicensed; see licence.php) */
.nano-blog-footer {
  margin-top: calc(var(--nano-spacing-unit) * 2);
  padding-top: var(--nano-spacing-unit);
  border-top: 1px solid var(--nano-color-border);
  font-size: 0.8125rem;
  color: var(--nano-color-text-muted);
  text-align: center;
}
.nano-blog-footer a {
  color: var(--nano-color-text-muted);
  text-decoration: underline;
  text-decoration-color: var(--nano-color-border);
  text-underline-offset: 0.15em;
}
.nano-blog-footer a:hover { color: var(--nano-color-accent); }

/* Dark mode */
@media (prefers-color-scheme: dark) {
  .nano-blog {
    --nano-color-text: #e8e8e8;
    --nano-color-text-muted: #999;
    --nano-color-bg: #121212;
    --nano-color-bg-soft: #1c1c1c;
    --nano-color-border: #2a2a2a;
    --nano-color-border-soft: #232323;
    --nano-color-accent: #5aa8ff;
  }
  .nano-blog code,
  .nano-blog pre { background: rgba(255, 255, 255, 0.06); }
  .nano-blog-draft-banner {
    background: #3d3520;
    color: #fde88a;
    border-color: #5a4f30;
  }
}