/* ==========================================================================
   Theme — Terra
   Layout, structural styles, ruled-line effect, and responsive design.
   Mobile-first: base styles are for mobile, then min-width breakpoints.
   ========================================================================== */


/* ==========================================================================
   1. Box Model & Reset
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

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


/* ==========================================================================
   2. Page Background — Ruled-Line Paper Effect
   ========================================================================== */

body {
  background-color: var(--color-bg);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent,
    transparent 1.6875rem,
    var(--color-rule-faint) 1.6875rem,
    var(--color-rule-faint) 1.75rem
  );
  background-size: 100% 1.75rem;
  margin: 0;
  padding: 0;
}


/* ==========================================================================
   3. Layout — Reading Column
   ========================================================================== */

.site-content {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.25rem;
}


/* ==========================================================================
   4. Header
   ========================================================================== */

.site-header {
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-border-accent);
  margin-bottom: 3rem;
}

.site-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-lg);
  font-weight: var(--weight-bold);
  letter-spacing: 0.02em;
  margin: 0;
  line-height: var(--leading-tight);
}

.site-title a {
  color: var(--color-text);
  text-decoration: none;
}

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


/* ==========================================================================
   5. Footer
   ========================================================================== */

.site-footer {
  padding: 2.5rem 0;
  margin-top: 3rem;
  border-top: 1px solid var(--color-border-accent);
  text-align: center;
}

.site-footer p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}


/* ==========================================================================
   6. Post List (Index / Home)
   ========================================================================== */

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}


.post-item {
  padding-bottom: 2.5rem;
  margin-bottom: 2.5rem;
  border-bottom: none;
  position: relative;
}

.post-item::after {
  content: "◆";
  display: block;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translate(-50%, 50%);
  font-size: 0.5rem;
  color: var(--color-border-accent);
  background: var(--color-bg);
  padding: 0 0.75rem;
}

.post-item::before {
  content: "";
  display: block;
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: var(--color-border-accent);
}

.post-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.post-item:last-child::before,
.post-item:last-child::after {
  display: none;
}

.post-thumbnail {
  display: block;
  margin-bottom: 1.25rem;
  border-radius: 4px;
  overflow: hidden;
}

.post-thumbnail img {
  width: 100%;
  height: auto;
  display: block;
  transition: opacity 0.3s ease;
}

.post-thumbnail:hover img {
  opacity: 0.85;
}

.post-date {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
  display: block;
}

.post-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-snug);
  margin: 0 0 0.5em;
}

.post-title a {
  color: var(--color-text);
  text-decoration: none;
}

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

.post-excerpt {
  position: relative;
  font-size: var(--font-size-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  margin: 0;
  max-height: 30em;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
}

.read-more-wrap {
  text-align: center;
  margin-top: 1.25em;
}

.read-more {
  font-size: var(--font-size-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-link);
  transition: color 0.2s ease;
}

.read-more:hover {
  color: var(--color-link-hover);
}


/* ==========================================================================
   7. Single Post / Page
   ========================================================================== */

.post-header {
  margin-bottom: 2.5rem;
}

.post-header .post-date {
  margin-bottom: 0.5rem;
}

.post-header .post-title {
  font-size: var(--font-size-2xl);
  letter-spacing: var(--tracking-tight);
  line-height: 1.15;
}

.post-content {
  margin-bottom: 3rem;
}

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

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


/* ==========================================================================
   8. Pagination
   ========================================================================== */

.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  font-size: var(--font-size-sm);
}

.pagination a {
  font-weight: var(--weight-medium);
}

.post-navigation {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}

.post-navigation .nav-previous,
.post-navigation .nav-next {
  flex: 1;
}

.post-navigation .nav-next {
  text-align: right;
}


/* ==========================================================================
   9. Gutenberg Block Overrides
   Content authored in the block editor needs some alignment.
   ========================================================================== */

.post-content .alignwide {
  max-width: 1100px;
  margin-left: calc(50% - 550px);
  margin-right: calc(50% - 550px);
}

.post-content .alignfull {
  max-width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
}

.wp-block-image {
  margin: 2em 0;
}

.wp-block-image figcaption {
  margin-top: 0.5em;
  text-align: center;
}

.wp-block-separator {
  border: none;
  border-top: 1px solid var(--color-border-accent);
  margin: 2.5em 0;
}

.wp-block-quote {
  font-family: var(--font-heading);
  font-size: var(--font-size-md);
  font-style: italic;
  line-height: var(--leading-snug);
  margin: 2em 0;
  padding-left: 1.5em;
  border-left: 3px solid var(--color-border-accent);
}

.wp-block-pullquote {
  font-family: var(--font-heading);
  font-size: var(--font-size-lg);
  font-style: italic;
  line-height: var(--leading-snug);
  text-align: center;
  padding: 1.5em 0;
  margin: 2em 0;
  border-top: 2px solid var(--color-border-accent);
  border-bottom: 2px solid var(--color-border-accent);
  border-left: none;
}

.wp-block-pullquote blockquote {
  border: none;
  padding: 0;
  margin: 0;
}

.wp-block-code {
  font-size: var(--font-size-sm);
  background: var(--color-surface-code);
  border-radius: 4px;
  padding: 1.25em 1.5em;
}


/* ==========================================================================
   10. 404 Page
   ========================================================================== */

.error-404 {
  text-align: center;
  padding: 4rem 0;
}

.error-404 h1 {
  margin-bottom: 0.5em;
}

.error-404 p {
  color: var(--color-text-secondary);
  margin-bottom: 2em;
}

.search-form {
  display: flex;
  gap: 0.5rem;
  max-width: 400px;
  margin: 0 auto;
}

.search-form .search-field {
  flex: 1;
  padding: 0.6em 1em;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text);
}

.search-form .search-field:focus {
  outline: none;
  border-color: var(--color-border-accent);
}

.search-form .search-submit {
  padding: 0.6em 1.25em;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: var(--weight-medium);
  background: var(--color-text);
  color: var(--color-bg);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.search-form .search-submit:hover {
  background: var(--color-link);
}


/* ==========================================================================
   11. Table of Contents (desktop only, opt-in per post)
   Hidden by default (mobile-first). Shown at --bp-xl.
   ========================================================================== */

.toc {
  display: none;
}


/* ==========================================================================
   12. Responsive — Larger Phones / Landscape (480px) --bp-sm
   ========================================================================== */

@media (min-width: 30rem) {
}


/* ==========================================================================
   13. Responsive — Tablet Portrait (768px) --bp-md
   ========================================================================== */

@media (min-width: 48rem) {
  .site-content {
    padding: 0 2rem;
  }

  body {
    background-image: repeating-linear-gradient(
      to bottom,
      transparent,
      transparent 1.9375rem,
      var(--color-rule-faint) 1.9375rem,
      var(--color-rule-faint) 2rem
    );
    background-size: 100% 2rem;
  }

  .site-header {
    padding: 2.5rem 0;
  }
}


/* ==========================================================================
   14. Responsive — Tablet Landscape (1024px) --bp-lg
   ========================================================================== */

@media (min-width: 64rem) {
  body {
    /* Ruled lines become even more subtle on larger screens */
    background-image: repeating-linear-gradient(
      to bottom,
      transparent,
      transparent 1.9375rem,
      rgba(155, 184, 211, 0.08) 1.9375rem,
      rgba(155, 184, 211, 0.08) 2rem
    );
  }

  .site-header {
    padding: 3rem 0;
    margin-bottom: 4rem;
  }

  .site-footer {
    margin-top: 4rem;
  }
}


/* ==========================================================================
   15. Responsive — Desktop (1280px) --bp-xl
   ========================================================================== */

@media (min-width: 80rem) {
  /* --- Table of Contents --- */
  .toc {
    display: block;
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    left: calc(50% - 410px - 14rem);
    width: 12rem;
    max-height: 70vh;
    overflow-y: auto;
    z-index: 10;
  }

  .toc-inner {
    padding: 1rem 0;
  }

  .toc-title {
    font-family: var(--font-body);
    font-size: var(--font-size-xs);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--color-text-secondary);
    margin: 0 0 0.75em;
  }

  .toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .toc-item {
    position: relative;
    display: flex;
    align-items: baseline;
    gap: 0.4em;
    padding: 0.15em 0;
    transition: all 0.3s ease;
  }

  .toc-item--sub {
    padding-left: 1em;
  }

  .toc-link {
    font-family: var(--font-body);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-decoration: none;
    line-height: var(--leading-snug);
    transition: color 0.3s ease;
  }

  .toc-link:hover {
    color: var(--color-text);
  }

  .toc-diamond {
    flex-shrink: 0;
    font-size: 0.5em;
    color: var(--color-rule);
    opacity: 0;
    transition: opacity 0.4s ease, color 0.4s ease;
  }

  .toc-item.is-active .toc-diamond {
    opacity: 1;
    color: var(--color-rule-dark);
  }

  .toc-item.is-active .toc-link {
    color: var(--color-text);
    font-weight: var(--weight-medium);
  }

  /* Subtle scrollbar for TOC overflow */
  .toc::-webkit-scrollbar {
    width: 3px;
  }

  .toc::-webkit-scrollbar-thumb {
    background: var(--color-rule-faint);
    border-radius: 3px;
  }
}


/* ==========================================================================
   16. Responsive — Large Desktop (1440px) --bp-2xl
   ========================================================================== */

@media (min-width: 90rem) {
}