/* ── CSS Variables ── */
:root {
  --bg-primary: #fafafa;
  --bg-secondary: #f3f3f3;
  --bg-code: #f0f0f0;
  --bg-code-inline: #ededeb;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --accent: #393939;
  --accent-hover: #111111;
  --accent-soft: rgba(0, 0, 0, 0.04);
  --border: #e0e0e0;
  --border-light: #ebebeb;
  --rule-line: rgba(0, 0, 0, 0.06);
  --selection: rgba(0, 0, 0, 0.1);
  --tag-bg: #efefef;
  --tag-text: #666666;
  --syn-keyword: #a626a4;
  --syn-string: #50a14f;
  --syn-comment: #a0a1a7;
  --syn-function: #4078f2;
  --syn-type: #c18401;
  --syn-number: #d75f00;
  --syn-macro: #6c47b8;
  --content-width: 720px;
  --font-serif: 'Newsreader', 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;1,6..72,400;1,6..72,500&family=JetBrains+Mono:wght@400;500;600&family=Noto+Serif+JP:wght@400;500;600&display=swap');

/* ── Reset & Base ── */
::selection {
  background: var(--selection);
}

body {
  font-family: var(--font-serif);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 17px;
  background-image:
    repeating-linear-gradient(
      to bottom,
      transparent,
      transparent 1.75rem,
      var(--rule-line) 1.75rem,
      var(--rule-line) calc(1.75rem + 1px)
    );
  background-size: 100% calc(1.75rem + 1px);
  background-position: 0 0.875rem;
}

/* ── Global Header (Hatena bar) ── */
#globalheader-container {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
}

/* ── Container ── */
#container {
  max-width: 100%;
  margin: 0 auto;
}

#container-inner {
  max-width: 100%;
}

#content {
  max-width: calc(var(--content-width) + 280px + 3rem);
  margin: 0 auto;
  padding: 0 1.5rem;
}

#content-inner {
  display: flex;
  gap: 3rem;
}

#wrapper {
  display: flex;
  gap: 3rem;
  width: 100%;
}

#main {
  flex: 1;
  max-width: var(--content-width);
  min-width: 0;
}

#main-inner {
  padding: 2rem 0 4rem;
}

/* ── Blog Header ── */
#blog-title {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-primary);
  background-image: none;
}

#blog-title-inner {
  max-width: calc(var(--content-width) + 280px + 3rem);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

#blog-title-content {
  display: block;
  width: 100%;
}

#title {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}

#title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

#blog-description {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.02em;
  margin: 0.4rem 0 0;
  line-height: 1.5;
}

/* ── Navigation ── */
.header-image-enable,
.header-image-only {
  background-size: cover;
}

/* ── Date ── */
.date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  letter-spacing: 0.03em;
  margin-bottom: 0.5rem;
}

.date a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* ── Entry ── */
.entry {
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border-light);
}

.entry:last-child {
  border-bottom: none;
}

.entry-header {
  margin-bottom: 1.5rem;
}

.entry-title {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  font-weight: 600;
  line-height: 1.35;
  margin: 0.3rem 0 0.5rem;
  letter-spacing: -0.02em;
}

.entry-title a,
.entry-title-link {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s;
}

.entry-title a:hover,
.entry-title-link:hover {
  color: var(--accent);
}

/* ── Categories / Tags ── */
.entry-categories,
.categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.entry-category-link,
.archive-category-link {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: all 0.2s;
}

.entry-category-link:hover,
.archive-category-link:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

/* ── Entry Content (Prose) ── */
.entry-content {
  font-size: 1rem;
  line-height: 1.75;
}

.entry-content p {
  margin-bottom: 1.4rem;
}

.entry-content h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  position: relative;
  padding-left: 1rem;
  border: none;
}

.entry-content h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.2em;
  bottom: 0.2em;
  width: 3px;
  background: var(--accent);
  border-radius: 1px;
}

.entry-content h3 {
  font-size: 1.1rem;
  font-weight: 500;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  border: none;
}

.entry-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.entry-content h5 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.entry-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(57, 57, 57, 0.3);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.2s;
}

.entry-content a:hover {
  text-decoration-color: var(--accent);
}

.entry-content a.keyword {
  text-decoration: none;
  color: var(--text-primary);
  border-bottom: 1px dotted var(--border);
  transition: border-color 0.2s;
}

.entry-content a.keyword:hover {
  border-bottom-color: var(--text-secondary);
}

.entry-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

.entry-content em {
  font-style: italic;
}

.entry-content ul,
.entry-content ol {
  margin-bottom: 1.4rem;
  padding-left: 1.5rem;
}

.entry-content li {
  margin-bottom: 0.4rem;
}

.entry-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--accent-soft);
  color: var(--text-secondary);
  font-style: italic;
  border-radius: 0 3px 3px 0;
}

.entry-content blockquote p:last-child {
  margin-bottom: 0;
}

.entry-content hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 2.5rem 0;
}

.entry-content img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.entry-content th,
.entry-content td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  text-align: left;
}

.entry-content th {
  background: var(--bg-secondary);
  font-weight: 600;
}

/* ── Table of Contents ── */
.entry-content .table-of-contents {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 1.25rem 1.5rem 1.25rem 2.5rem;
  margin: 1.5rem 0;
  font-size: 0.9rem;
  line-height: 1.8;
}

.entry-content .table-of-contents a {
  color: var(--text-secondary);
  text-decoration: none;
}

.entry-content .table-of-contents a:hover {
  color: var(--accent);
}

/* ── Code ── */
code {
  font-family: var(--font-mono);
  font-size: 0.82em;
}

.entry-content code {
  background: var(--bg-code-inline);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-size: 0.82em;
  color: var(--text-primary);
}

pre,
.entry-content pre {
  background: var(--bg-code);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  line-height: 1.6;
  position: relative;
}

pre code,
.entry-content pre code {
  background: none;
  padding: 0;
  font-size: 0.78rem;
  line-height: 1.6;
  border-radius: 0;
}

/* Language label */
pre.code[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-tertiary);
  padding: 0.3rem 0.6rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  opacity: 0.7;
}

/* Scrollbar */
pre::-webkit-scrollbar {
  height: 4px;
}

pre::-webkit-scrollbar-track {
  background: transparent;
}

pre::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* ── Hatena Syntax Highlighting ── */
.synComment   { color: var(--syn-comment); font-style: italic; }
.synConstant  { color: var(--syn-string); }
.synIdentifier{ color: var(--syn-function); }
.synStatement { color: var(--syn-keyword); font-weight: 500; }
.synPreProc   { color: var(--syn-macro); }
.synType      { color: var(--syn-type); }
.synSpecial   { color: var(--syn-number); }

/* ── Entry Footer ── */
.entry-footer {
  margin-top: 2rem;
}

.entry-footer-section {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

.entry-footer-section a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.2s;
}

.entry-footer-section a:hover {
  color: var(--accent);
}

/* Social buttons */
.social-buttons {
  margin-top: 1rem;
}

/* ── Continue Reading ── */
.entry-see-more {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: color 0.2s;
}

.entry-see-more:hover {
  color: var(--accent-hover);
}

.entry-see-more::after {
  content: ' →';
  display: inline-block;
  transition: transform 0.2s;
}

.entry-see-more:hover::after {
  transform: translateX(3px);
}

/* ── Pager (Prev / Next) ── */
.pager {
  display: flex;
  justify-content: space-between;
  margin: 3rem 0 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-light);
}

.pager a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.pager-prev a::before {
  content: '← ';
}

.pager-next a::after {
  content: ' →';
}

/* ── Archive Page ── */
.archive-entries {
  margin: 1rem 0;
}

.archive-entry {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
}

.archive-entry:last-child {
  border-bottom: none;
}

.archive-entry .entry-title {
  font-size: 1.35rem;
  margin: 0.3rem 0 0.4rem;
}

.archive-entry .entry-thumb-link {
  display: none;
}

.entry-description {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-top: 0.5rem;
}

/* ── Breadcrumb ── */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  padding: 0.75rem 0;
}

.breadcrumb a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.breadcrumb-gt {
  margin: 0 0.3rem;
  opacity: 0.4;
}

/* ── Sidebar ── */
#box2 {
  width: 260px;
  flex-shrink: 0;
}

#box2-inner {
  padding: 2rem 0 4rem;
}

.hatena-module {
  margin-bottom: 2rem;
}

.hatena-module-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

.hatena-module-title a {
  color: var(--text-tertiary);
  text-decoration: none;
}

.hatena-module-body {
  font-size: 0.88rem;
}

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

.hatena-urllist li {
  margin-bottom: 0.6rem;
}

.hatena-urllist a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.2s;
}

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

.hatena-urllist .urllist-date-link {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-tertiary);
  display: block;
  margin-top: 0.1rem;
}

/* Search box */
.hatena-module-search-box .search-form {
  display: flex;
}

.hatena-module-search-box .search-module-input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-right: none;
  border-radius: 3px 0 0 3px;
  background: var(--bg-primary);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s;
}

.hatena-module-search-box .search-module-input:focus {
  border-color: var(--accent);
}

.hatena-module-search-box .search-module-button {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 0 3px 3px 0;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.hatena-module-search-box .search-module-button:hover {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

/* Profile */
.hatena-module-profile .profile-icon {
  border-radius: 50%;
  width: 48px;
  height: 48px;
}

.hatena-module-profile .id {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  display: block;
  margin: 0.5rem 0 0.25rem;
}

.hatena-module-profile .id a {
  color: var(--text-primary);
  text-decoration: none;
}

.hatena-module-profile .profile-description {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Subscribe button */
.btn-subscribe,
.reader-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-block;
  margin-top: 0.5rem;
}

.btn-subscribe:hover,
.reader-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Comment Section ── */
.comment-box {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.leave-comment-title {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  padding: 0.5rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  transition: all 0.2s;
  margin-bottom: 1rem;
}

.leave-comment-title:hover {
  color: var(--accent-hover);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.comment-content {
  margin-top: 1.5rem;
}

.comment-content .comment {
  list-style: none;
  padding: 0;
}

.comment-content .comment li {
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.9rem;
  line-height: 1.65;
}

.comment-user-name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.comment-user-name a {
  color: var(--text-primary);
  text-decoration: none;
}

/* ── Hatena Star ── */
.hatena-star-container {
  margin-top: 0.5rem;
}

/* ── Footer ── */
#footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

#footer-inner {
  max-width: calc(var(--content-width) + 280px + 3rem);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.footer-address {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-tertiary);
  font-style: normal;
}

.footer-address a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.2s;
}

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

#footer .services {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-tertiary);
  margin-top: 0.3rem;
}

#footer .services a {
  color: var(--text-tertiary);
  text-decoration: none;
}

/* ── Responsive ── */
@media (max-width: 860px) {
  #content-inner,
  #wrapper {
    flex-direction: column;
    gap: 0;
  }

  #box2 {
    width: 100%;
    border-top: 1px solid var(--border);
  }

  #box2-inner {
    padding: 2rem 0;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  #blog-title-inner,
  #content,
  #footer-inner {
    padding: 0 1rem;
  }

  #blog-title-content {
    flex-direction: column;
    gap: 0.3rem;
  }

  .entry-title {
    font-size: 1.5rem;
  }

  pre,
  .entry-content pre {
    padding: 1rem;
    margin-left: -0.5rem;
    margin-right: -0.5rem;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
}