/* ===== CSS VARIABLES ===== */
:root {
  --color-primary: #8f6a60;
  --color-primary-hover: #6b5046;
  --color-text: #232426;
  --color-text-light: #4a4b4f;
  --color-text-muted: #777;
  --color-text-dimmed: #666;
  --color-bg: #fbfbfb;
  --color-border: #e5e5e5;
  --color-border-light: #eee;
  --color-border-medium: #d5d5d5;
  --color-border-dark: #d0d0d0;
  --color-code-bg: #f5f5f5;
  
  --font-base: Verdana, Tahoma, Helvetica, Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  
  --spacing-xs: 4px;
  --spacing-sm: 10px;
  --spacing-md: 20px;
  --spacing-lg: 40px;
  --spacing-xl: 60px;
  
  --border-radius-sm: 3px;
  --border-radius-md: 4px;
}

/* ===== SEMANTIC ELEMENTS RESET ===== */
article, section, header, footer, nav, main {
  display: block;
}

/* ===== ACCESSIBILITY ===== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: #000;
  color: #fff;
  padding: 8px;
  text-decoration: none;
  border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
  z-index: 1000;
  font-weight: 600;
}

.skip-link:focus {
  top: 0;
}

/* ===== BASE STYLES ===== */
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-base);
  font-size: 15px;
  line-height: 1.6;
  font-optical-sizing: auto;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* ===== TYPOGRAPHY ===== */
h1 {
  font-family: inherit;
  font-size: 24px;
  font-weight: 600;
  font-optical-sizing: auto;
  margin: 0 0 var(--spacing-lg) 0;
  color: var(--color-text-light);
}

.list-page h1,
.tags-page h1,
.post-title {
  font-size: 22px;
  font-weight: 700;
}

.post-title {
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

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

/* Article headings hierarchy */
.post-content h1 {
  font-size: 22px;
  font-weight: 700;
  margin: var(--spacing-lg) 0 var(--spacing-md) 0;
  color: var(--color-text-light);
}

.post-content h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 30px 0 var(--spacing-md) 0;
  color: var(--color-text-light);
}

.post-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 25px 0 15px 0;
  color: var(--color-text-light);
}

.post-content h4 {
  font-size: 16px;
  font-weight: 600;
  margin: var(--spacing-md) 0 15px 0;
  color: var(--color-text-light);
}

.post-content h5 {
  font-size: 15px;
  font-weight: 600;
  margin: var(--spacing-md) 0 var(--spacing-sm) 0;
  color: var(--color-text-light);
}

.post-content h6 {
  font-size: 14px;
  font-weight: 600;
  margin: 15px 0 var(--spacing-sm) 0;
  color: var(--color-text-light);
}

p {
  margin: 0 0 var(--spacing-md) 0;
  line-height: 1.7;
}

.post-content p {
  line-height: 1.8;
}

/* ===== LINKS ===== */
a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

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

/* ===== LAYOUT CONTAINERS ===== */
.container {
  max-width: 660px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.page-container,
.tags-container {
  display: flex;
  flex-direction: column;
  margin: 0 auto;
  max-width: 620px;
  padding: 0 var(--spacing-md);
}

.post-container {
  max-width: 660px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.content-column {
  width: 100%;
  box-sizing: border-box;
  font-size: 15px;
}

/* ===== SECTIONS ===== */
.section {
  margin-bottom: var(--spacing-lg);
}

.post-header {
  margin-bottom: var(--spacing-lg);
}

.post-content {
  line-height: 1.8;
  font-size: 15px;
  overflow-x: auto;
  overflow-y: visible;
}

/* ===== WORK ITEMS & POSTS ===== */
.works-title {
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--color-text-light);
}

.work-item {
  margin-bottom: 12px;
  line-height: 1.6;
}

.list-page .work-item {
  margin-bottom: var(--spacing-md);
}

.list-page .work-item:last-child {
  border-bottom: none;
}

.work-link {
  display: block;
  text-decoration: none;
  color: var(--color-text-light);
}

.work-title {
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.work-title:hover {
  color: var(--color-primary-hover);
}

.list-page .post-header {
  margin-bottom: var(--spacing-md);
}

.post-item {
  margin-bottom: 80px;
}

.read-more {
  margin-top: var(--spacing-md);
}

.read-more a {
  color: var(--color-primary);
  text-decoration: underline;
  font-weight: 500;
}

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

/* ===== DATES & METADATA ===== */
.year,
.post-date {
  color: var(--color-text-muted);
  font-size: 14px;
}

.post-date {
  margin-bottom: var(--spacing-md);
}

.description {
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
  font-size: 14px;
}

.list-page .description {
  margin-top: 5px;
  line-height: 1.5;
}

.post-description {
  font-style: italic;
  color: var(--color-text-dimmed);
  margin-bottom: 30px;
  font-size: 17px;
}

/* ===== NAVIGATION ===== */
.back-link {
  display: inline-block;
  margin-bottom: 30px;
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

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

.post-container .back-link {
  margin: var(--spacing-lg) 0;
}

.horizontal-menu {
  display: flex;
  gap: 15px;
  margin: var(--spacing-md) 0 var(--spacing-lg);
}

.horizontal-menu a {
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.post-navigation {
  display: flex;
  justify-content: space-between;
  margin: var(--spacing-md) 0;
  font-size: 16px;
}

.prev-post,
.next-post {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.prev-post:hover,
.next-post:hover {
  color: var(--color-primary-hover);
}

/* ===== IMAGES ===== */
.profile-photo-wrapper {
  margin-bottom: var(--spacing-md);
}

.profile-photo {
  width: 100px;
  height: auto;
  border-radius: 50%;
  float: left;
  margin-right: var(--spacing-md);
}

.post-content img {
  display: block;
  margin: 1.5em auto;
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius-md);
}

.post-content img + em {
  display: block;
  text-align: center;
  font-size: 0.9em;
  color: var(--color-text-muted);
  margin-top: -1em;
  margin-bottom: 1.5em;
}

.footer-image {
  margin-top: 30px;
  text-align: left;
}

.footer-image img {
  width: 60px;
  height: auto;
  opacity: 0.7;
}

/* ===== CODE BLOCKS ===== */
pre {
  background-color: var(--color-code-bg);
  padding: 16px;
  border-radius: var(--border-radius-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

code {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
}

pre code {
  display: block;
  white-space: pre !important;
  word-wrap: normal !important;
  word-break: normal;
  overflow-x: auto;
}

p code,
li code,
h1 code,
h2 code,
h3 code,
h4 code,
h5 code,
h6 code {
  background-color: var(--color-code-bg);
  padding: 3px 5px;
  border-radius: var(--border-radius-sm);
  font-size: 0.9em;
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* ===== MATH & SPECIAL CONTENT ===== */
.post-content mjx-container[display="true"] {
  display: block;
  text-align: center;
  margin: 1em 0;
  overflow-x: auto !important;
  overflow-y: visible !important;
  max-width: 100% !important;
  width: 100% !important;
  box-sizing: border-box;
  padding: 1em 0;
  min-height: unset;
}

.post-content mjx-container[display="true"] mjx-math {
  min-width: 0 !important;
  max-width: 100% !important;
  overflow-x: auto !important;
  overflow-y: visible !important;
  white-space: pre;
  box-sizing: border-box;
  min-height: unset;
}

blockquote {
  font-style: italic;
  border-left: 2px solid var(--color-border-medium);
  padding-left: var(--spacing-sm);
  margin-left: var(--spacing-md);
}

.post-content em {
  color: var(--color-text-dimmed);
}

/* ===== CONTACT & FOOTER ===== */
.contact {
  margin-top: 50px;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.comments {
  margin-top: 0;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border-dark);
}

.footnotes hr {
  color: var(--color-border-dark);
  border-top: none;
  margin-bottom: var(--spacing-md);
}

.footnotes {
  font-size: 13px;
}

.footnotes ol {
  padding-left: var(--spacing-md);
}

/* ===== TAGS PAGE ===== */
.tag-list {
  margin-bottom: var(--spacing-lg);
}

.tag-list ul {
  margin: 0;
}

.tags {
  font-size: 14px;
}

/* ===== 404 PAGE ===== */
.not-found-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 70vh;
  max-width: 620px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
  color: var(--color-text-light);
}

.not-found-title {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 30px 0;
  color: var(--color-text-light);
}

.not-found-message {
  font-size: 15px;
  line-height: 1.6;
  margin-bottom: 30px;
}

/* ===== PAGINATION ===== */
.pagination {
  margin-bottom: 80px;
  text-align: center;
}

.pagination-links {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  margin: 0;
}

.pagination-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  padding: var(--spacing-sm) 0;
}

.pagination-link:hover {
  color: var(--color-primary-hover);
}

.pagination-info {
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  h1 {
    font-size: 22px;
  }
  
  .post-content h2 {
    font-size: 18px;
  }
  
  .post-content h3 {
    font-size: 16px;
  }
  
  .post-content h4 {
    font-size: 15px;
  }
  
  .pagination-links {
    flex-direction: column;
    gap: 15px;
  }
  
  .pagination-info {
    order: -1;
  }
}

@media (max-width: 992px) {
  .page-container {
    flex-direction: column;
  }

  .content-column {
    width: 100%;
    padding-right: 0;
    margin: 0 auto;
  }
}