/* ==========================================================================
   Octopus Mono - Minimalist Typography-First Monochrome Hugo Theme
   Inspired by clean organic line-art aesthetics (#201d1e)
   ========================================================================== */

:root {
  /* Core palette from SVG reference rgb(32,29,30) */
  --ink-primary: #201d1e;
  --ink-secondary: #5a5556;
  --ink-muted: #8b8587;
  --ink-faint: #d5d1d2;
  --paper-bg: #fcfbf9;
  --paper-surface: #f4f2ee;
  --paper-surface-hover: #eae7e2;
  --border-color: #201d1e;
  --border-light: #e4e0de;
  --code-bg: #f0eeea;
  --selection-bg: #201d1e;
  --selection-color: #fcfbf9;
  
  /* Typography scale */
  --font-serif: "Newsreader", "Charis SIL", "Georgia", "Cambria", "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;
  
  --line-height-body: 1.75;
  --line-height-heading: 1.25;
  
  --max-content-width: 720px;
  --max-site-width: 860px;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3.5rem;
  --spacing-2xl: 5rem;
  
  --radius: 0px; /* brutalist crisp corners */
  --transition: 0.15s ease-in-out;

  /* Logo line control (scaled for 80x80 viewBox) */
  --logo-stroke-width: 3.2px;
}

[data-theme="dark"] {
  --ink-primary: #f2f0ee;
  --ink-secondary: #b3adaf;
  --ink-muted: #7e787a;
  --ink-faint: #363234;
  --paper-bg: #151314;
  --paper-surface: #201d1e;
  --paper-surface-hover: #2b2729;
  --border-color: #f2f0ee;
  --border-light: #2e2a2c;
  --code-bg: #1c191a;
  --selection-bg: #f2f0ee;
  --selection-color: #151314;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink-primary: #f2f0ee;
    --ink-secondary: #b3adaf;
    --ink-muted: #7e787a;
    --ink-faint: #363234;
    --paper-bg: #151314;
    --paper-surface: #201d1e;
    --paper-surface-hover: #2b2729;
    --border-color: #f2f0ee;
    --border-light: #2e2a2c;
    --code-bg: #1c191a;
    --selection-bg: #f2f0ee;
    --selection-color: #151314;
  }
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

::selection {
  background-color: var(--selection-bg);
  color: var(--selection-color);
}

html {
  font-size: 17px;
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background-color: var(--paper-bg);
  color: var(--ink-primary);
  font-family: var(--font-serif);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition), color var(--transition);
}

/* Layout */
.site-wrapper {
  width: 100%;
  max-width: var(--max-site-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  padding: var(--spacing-xl) 0;
}

/* Header */
.site-header {
  padding: var(--spacing-xl) 0 var(--spacing-lg) 0;
  border-bottom: 2px solid var(--ink-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.site-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--ink-primary);
}

/* Octopus SVG Logo with dynamic stroke */
.octopus-logo-svg {
  width: 100%;
  height: 100%;
  display: block;
}

.octopus-logo-svg path {
  stroke: currentColor;
  stroke-width: var(--logo-stroke-width);
  transition: stroke-width var(--transition);
}

.site-logo {
  width: 72px;
  height: 72px;
  display: block;
  flex-shrink: 0;
  color: var(--ink-primary);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.site-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.site-tagline {
  font-size: 0.8rem;
  color: var(--ink-secondary);
  font-family: var(--font-sans);
  letter-spacing: 0.04em;
  margin-top: 2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink-secondary);
  letter-spacing: 0.02em;
  padding: var(--spacing-xs) 0;
  position: relative;
  transition: color var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--ink-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--ink-primary);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--ink-faint);
  color: var(--ink-primary);
  width: 34px;
  height: 34px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: border-color var(--transition), background-color var(--transition);
}

.theme-toggle:hover {
  border-color: var(--ink-primary);
  background-color: var(--paper-surface);
}

.theme-toggle svg {
  width: 17px;
  height: 17px;
  stroke: currentColor;
  fill: none;
}

/* Post list */
.section-heading {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.section-heading::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--border-light);
}

.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.post-card {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  position: relative;
  transition: transform var(--transition);
}

.post-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.post-card-title {
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.3;
}

.post-card-title a {
  text-decoration: none;
  color: var(--ink-primary);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.post-card-title a:hover {
  border-bottom-color: var(--ink-primary);
}

.post-card-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
  white-space: nowrap;
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.post-card-summary {
  color: var(--ink-secondary);
  font-size: 0.98rem;
  line-height: 1.6;
  margin-top: var(--spacing-xs);
}

.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.tag-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-secondary);
  background-color: var(--paper-surface);
  padding: 2px 8px;
  text-decoration: none;
  border: 1px solid var(--border-light);
  transition: all var(--transition);
}

.tag-badge:hover {
  background-color: var(--ink-primary);
  color: var(--paper-bg);
  border-color: var(--ink-primary);
}

/* Post card video */
.post-card-video {
  max-width: 480px;
  margin-top: var(--spacing-sm);
  border: 1px solid var(--border-light);
  margin: 0 auto;
}

.post-card-video video {
  width: 100%;
  height: auto;
  display: block;
}

/* Post card expand */
.post-card-toggle-btn {
  margin-top: var(--spacing-sm);
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: none;
  border: none;
  padding: var(--spacing-xs) 0;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color var(--transition);
}

.post-card-toggle-btn:hover {
  color: var(--ink-primary);
}

.toggle-arrow {
  display: inline-block;
  font-size: 0.7rem;
  transition: transform 0.3s ease;
}

.post-card.expanded .toggle-arrow {
  transform: rotate(180deg);
}

.post-card-full-content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}

.post-card.expanded .post-card-full-content {
  grid-template-rows: 1fr;
  margin-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

.post-card-full-inner {
  overflow: hidden;
}

.post-card.expanded .post-card-full-inner {
  padding-top: var(--spacing-md);
}

.post-card-full-inner {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink-secondary);
}

.post-card-full-inner > * + * {
  margin-top: 1.2em;
}

/* Single Post Typography */
.article-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.article-title {
  font-size: 2.5rem;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-md);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--ink-secondary);
}

.meta-divider {
  color: var(--ink-faint);
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  max-width: var(--max-content-width);
}

.article-content > * + * {
  margin-top: 1.5em;
}

.article-content h2 {
  font-family: var(--font-sans);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: var(--line-height-heading);
  margin-top: 2.2em;
  margin-bottom: 0.6em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border-light);
}

.article-content h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: var(--line-height-heading);
  margin-top: 1.8em;
  margin-bottom: 0.5em;
}

.article-content p {
  margin-bottom: 1.4em;
}

.article-content a {
  color: var(--ink-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: opacity var(--transition);
}

.article-content a:hover {
  opacity: 0.7;
}

.article-content blockquote {
  border-left: 3px solid var(--ink-primary);
  padding: var(--spacing-sm) 0 var(--spacing-sm) var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--ink-secondary);
  background: var(--paper-surface);
}

.article-content blockquote p {
  margin-bottom: 0;
}

.article-content ul,
.article-content ol {
  padding-left: var(--spacing-lg);
  margin-bottom: 1.4em;
}

.article-content li {
  margin-bottom: 0.4em;
}

.article-content hr {
  border: none;
  border-top: 1px dashed var(--ink-faint);
  margin: var(--spacing-xl) 0;
}

.article-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-lg) auto;
  border: 1px solid var(--border-light);
}

/* Code & Pre */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 2px;
  color: var(--ink-primary);
}

pre {
  background-color: var(--code-bg);
  padding: var(--spacing-md) var(--spacing-lg);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
  border: 1px solid var(--border-light);
  margin: var(--spacing-lg) 0;
}

pre code {
  background-color: transparent;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  font-size: 0.95rem;
}

th, td {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-light);
  text-align: left;
}

th {
  background-color: var(--paper-surface);
  font-family: var(--font-sans);
  font-weight: 600;
}

/* Post Navigation / Footer */
.article-footer {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 2px solid var(--ink-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.post-nav {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-top: var(--spacing-lg);
  gap: var(--spacing-md);
}

.post-nav-item {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--ink-primary);
  max-width: 48%;
}

.post-nav-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
  text-transform: uppercase;
}

.post-nav-title {
  font-size: 0.95rem;
  font-weight: 600;
}

.post-nav-item.next {
  text-align: right;
  margin-left: auto;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.pagination a {
  color: var(--ink-primary);
  text-decoration: none;
  border: 1px solid var(--border-light);
  padding: var(--spacing-xs) var(--spacing-md);
  transition: all var(--transition);
}

.pagination a:hover {
  background-color: var(--ink-primary);
  color: var(--paper-bg);
}

.pagination .disabled {
  color: var(--ink-muted);
  border-color: var(--ink-faint);
  pointer-events: none;
}

/* Tag Cloud / Taxonomy List */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.tag-cloud-item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--ink-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  transition: all var(--transition);
}

.tag-cloud-item:hover {
  background-color: var(--ink-primary);
  color: var(--paper-bg);
}

.tag-cloud-count {
  font-size: 0.75rem;
  opacity: 0.65;
}

/* Donate Block */
.donate-block {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.donate-label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
}

/* Site Footer */
.site-footer {
  margin-top: auto;
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.site-footer a {
  color: var(--ink-secondary);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--ink-primary);
  text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 640px) {
  html {
    font-size: 16px;
  }
  
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .site-nav {
    width: 100%;
    justify-content: space-between;
  }
  
  .site-logo {
    width: 56px;
    height: 56px;
  }

  .nav-links {
    gap: var(--spacing-md);
  }
  
  .post-card-header {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .article-title {
    font-size: 2rem;
  }
  
  .site-footer {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
}