/* ============================================================
   MAIN STYLESHEET — Custom Jekyll Theme
   ============================================================ */

/* -- Fonts -------------------------------------------------- */
/* Cormorant Garamond: display/headings (elegant serif)        */
/* DM Sans: body (modern, clean)                               */

/* -- Design Tokens ------------------------------------------ */
:root {
  /* Color Palette */
  --color-bg:           #FAFAF8;
  --color-surface:      #FFFFFF;
  --color-ink:          #1A1A18;
  --color-ink-muted:    #6B6B65;
  --color-ink-faint:    #9E9E96;
  --color-border:       #E8E8E2;
  --color-accent:       #C8A97A;       /* warm gold */
  --color-accent-dark:  #9E7E52;
  --color-tag-bg:       #F0EFE8;
  --color-tag-hover:    #E5E3D8;
  --color-code-bg:      #F4F3EE;
  --color-code-border:  #E0DED6;

  /* Typography */
  --font-display:       'Cormorant Garamond', Georgia, serif;
  --font-body:          'DM Sans', 'Helvetica Neue', sans-serif;
  --font-mono:          'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --container-max:      1200px;
  --container-narrow:   680px;
  --container-wide:     1100px;

  /* UI */
  --radius:             4px;
  --transition:         200ms ease;
  --header-height:      64px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.75;
  color: var(--color-ink);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* -- Layout Containers ------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-xl);
}
.container--narrow { max-width: var(--container-narrow); }
.container--wide   { max-width: var(--container-wide); }

/* -- Header ------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled {
  box-shadow: 0 1px 24px rgba(0,0,0,0.06);
}
.header-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

.site-logo-text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  transition: color var(--transition);
}
.site-logo:hover .site-logo-text { color: var(--color-accent-dark); }

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}
.nav-link {
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  position: relative;
  transition: color var(--transition);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1px;
  background: var(--color-accent);
  transition: width var(--transition);
}
.nav-link:hover,
.nav-link--active { color: var(--color-ink); }
.nav-link:hover::after,
.nav-link--active::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}
.nav-toggle-bar {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--color-ink);
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* -- Hero -------------------------------------------------- */
.home-hero {
  position: relative;
  padding: var(--space-3xl) var(--space-xl) var(--space-2xl);
  max-width: var(--container-max);
  margin-inline: auto;
  overflow: hidden;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 560px;
}
.hero-eyebrow {
  display: block;
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin-bottom: var(--space-lg);
}
.hero-tagline {
  font-size: 1.125rem;
  font-weight: 300;
  color: var(--color-ink-muted);
  line-height: 1.6;
  max-width: 420px;
}

.hero-decoration {
  position: absolute;
  top: 50%; right: 8%;
  transform: translateY(-50%);
  pointer-events: none;
}
.deco-line {
  display: block;
  position: absolute;
  top: -80px; left: 50%;
  width: 1px; height: 160px;
  background: linear-gradient(to bottom, transparent, var(--color-accent), transparent);
  opacity: 0.4;
}
.deco-circle {
  display: block;
  width: 180px; height: 180px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  opacity: 0.6;
}

/* -- Posts Section ----------------------------------------- */
.posts-section { padding: var(--space-xl) 0 var(--space-3xl); }

/* Category Filter */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}
.filter-btn {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  color: var(--color-ink-muted);
  background: transparent;
  transition: all var(--transition);
}
.filter-btn:hover,
.filter-btn.active {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-bg);
}

/* Posts Grid */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}
.post-card {
  background: var(--color-surface);
  transition: background var(--transition);
}
.post-card.hidden { display: none; }
.post-card:hover { background: var(--color-bg); }
.post-card-inner {
  padding: var(--space-xl);
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.post-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-faint);
}
.post-category {
  text-transform: uppercase;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--color-accent-dark);
}
.reading-time {
  font-size: 0.75rem;
  color: var(--color-ink-faint);
}

.post-card-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.post-card-title a {
  transition: color var(--transition);
}
.post-card-title a:hover { color: var(--color-accent-dark); }

.post-card-excerpt {
  font-size: 0.9375rem;
  color: var(--color-ink-muted);
  line-height: 1.65;
  flex: 1;
}

.post-card-link {
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  margin-top: auto;
  transition: letter-spacing var(--transition);
}
.post-card-link:hover { letter-spacing: 0.1em; }

/* Tags */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}
.tag {
  font-size: 0.75rem;
  padding: 2px var(--space-sm);
  border-radius: var(--radius);
  background: var(--color-tag-bg);
  color: var(--color-ink-muted);
  transition: background var(--transition);
}
.tag:hover { background: var(--color-tag-hover); color: var(--color-ink); }

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}
.pagination-btn {
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  transition: color var(--transition);
}
.pagination-btn:hover { color: var(--color-ink); }
.pagination-info {
  font-size: 0.8125rem;
  color: var(--color-ink-faint);
}

/* -- Post Page --------------------------------------------- */
.post-header {
  padding: var(--space-3xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}
.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-lg);
}
.post-separator { color: var(--color-border); }
.post-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin-bottom: var(--space-lg);
}
.post-subtitle {
  font-size: 1.125rem;
  color: var(--color-ink-muted);
  font-weight: 300;
  margin-top: calc(-1 * var(--space-sm));
  margin-bottom: var(--space-lg);
}

/* Post Body Layout */
.post-body {
  padding: var(--space-2xl) 0;
}
.post-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: var(--space-3xl);
  align-items: start;
  direction: rtl; /* pull sidebar to right naturally */
}
.post-layout > * { direction: ltr; }

/* Table of Contents */
.toc-sidebar { order: 1; }
.toc-sticky {
  position: sticky;
  top: calc(var(--header-height) + var(--space-xl));
}
.toc-label {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-md);
}
.toc {
  font-size: 0.8125rem;
  line-height: 1.5;
}
.toc ol, .toc ul { list-style: none; }
.toc li { margin-bottom: var(--space-xs); }
.toc a {
  color: var(--color-ink-muted);
  transition: color var(--transition);
  display: block;
  padding: 2px 0;
  border-left: 2px solid transparent;
  padding-left: var(--space-sm);
}
.toc a:hover { color: var(--color-ink); }
.toc a.active {
  color: var(--color-accent-dark);
  border-left-color: var(--color-accent);
}
.toc .toc-h3 { padding-left: calc(var(--space-sm) + var(--space-md)); font-size: 0.75rem; }

/* Post Content Typography */
.post-content {
  min-width: 0;
}
.post-content h2 {
  font-family: var(--font-display);
  font-size: 1.875rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  scroll-margin-top: calc(var(--header-height) + var(--space-xl));
}
.post-content h3 {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 500;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  scroll-margin-top: calc(var(--header-height) + var(--space-xl));
}
.post-content h4 {
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}
.post-content p {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-ink);
  margin-bottom: var(--space-lg);
}
.post-content a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--color-accent) 40%, transparent);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition);
}
.post-content a:hover {
  text-decoration-color: var(--color-accent);
}
.post-content ul, .post-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}
.post-content ul { list-style: disc; }
.post-content ol { list-style: decimal; }
.post-content li {
  font-size: 1.0625rem;
  line-height: 1.75;
  margin-bottom: var(--space-xs);
}
.post-content blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  border-left: 3px solid var(--color-accent);
  background: var(--color-tag-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.post-content blockquote p {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-style: italic;
  font-weight: 400;
  color: var(--color-ink-muted);
  margin-bottom: 0;
}
.post-content img {
  border-radius: var(--radius);
  margin: var(--space-xl) 0;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}
.post-content figure {
  margin: var(--space-xl) 0;
}
.post-content figure img {
  margin: 0;
}
.post-content figcaption {
  margin-top: var(--space-xs);
  font-size: 0.75rem;
  color: var(--color-ink-faint);
  font-style: italic;
  text-align: center;
}
.post-content hr {
  margin: var(--space-2xl) 0;
  border: none;
  border-top: 1px solid var(--color-border);
}
.post-content strong { font-weight: 500; }
.post-content em { font-style: italic; }

/* Inline Code */
.post-content code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 2px 6px;
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius);
  color: var(--color-ink);
}

/* Code Blocks */
.post-content pre {
  position: relative;
  margin: var(--space-xl) 0;
  padding: var(--space-xl);
  background: #1C1C1A;
  border-radius: 8px;
  overflow-x: auto;
  box-shadow: 0 4px 24px rgba(0,0,0,0.12);
}
.post-content pre code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: #E8E6DF;
  background: none;
  border: none;
  padding: 0;
}
/* Language label */
.post-content pre[class*="language-"]::before {
  content: attr(data-lang);
  position: absolute;
  top: var(--space-sm);
  right: var(--space-md);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6B6B65;
}

/* -- Post Footer ------------------------------------------- */
.post-footer {
  padding: var(--space-2xl) 0 var(--space-3xl);
  border-top: 1px solid var(--color-border);
}
.post-footer-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}
.footer-label {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
}
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}
.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  transition: opacity var(--transition);
}
.post-nav-link--next { text-align: right; }
.post-nav-link:hover { opacity: 0.7; }
.post-nav-label {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
}
.post-nav-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 400;
}

/* -- Page Layout ------------------------------------------ */
.page-header {
  padding: var(--space-3xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}
.page-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.02em;
}
.page-subtitle {
  font-size: 1.125rem;
  color: var(--color-ink-muted);
  margin-top: var(--space-md);
}
.page-content {
  padding: var(--space-2xl) 0 var(--space-3xl);
}
.page-content p { font-size: 1.0625rem; line-height: 1.8; margin-bottom: var(--space-lg); }

/* -- Tags Page -------------------------------------------- */
.tags-page { padding-bottom: var(--space-3xl); }
.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-2xl);
}
.tag--large {
  font-size: 0.9375rem;
  padding: var(--space-xs) var(--space-md);
}
.tag--large sup {
  font-size: 0.625rem;
  color: var(--color-ink-faint);
  margin-left: 2px;
}
.tag-section { margin-bottom: var(--space-2xl); }
.tag-section-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}
.tag-posts { display: flex; flex-direction: column; gap: var(--space-sm); }
.tag-post-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-lg);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid color-mix(in srgb, var(--color-border) 50%, transparent);
}
.tag-post-date {
  font-size: 0.75rem;
  color: var(--color-ink-faint);
  white-space: nowrap;
  min-width: 90px;
}
.tag-post-title {
  font-size: 1rem;
  transition: color var(--transition);
}
.tag-post-title:hover { color: var(--color-accent-dark); }

/* -- Footer ----------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) var(--space-xl) var(--space-lg);
}
.footer-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-2xl);
  align-items: start;
  padding-bottom: var(--space-xl);
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  display: block;
  margin-bottom: var(--space-sm);
}
.footer-desc {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  line-height: 1.6;
  max-width: 280px;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-top: var(--space-xs);
}
.footer-link {
  font-size: 0.875rem;
  color: var(--color-ink-muted);
  transition: color var(--transition);
}
.footer-link:hover { color: var(--color-ink); }
.footer-social {
  display: flex;
  gap: var(--space-md);
  padding-top: var(--space-xs);
}
.social-link {
  color: var(--color-ink-muted);
  transition: color var(--transition);
}
.social-link:hover { color: var(--color-ink); }
.footer-bottom {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-ink-faint);
}
.footer-bottom a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* -- Utilities -------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* -- Page Entrance Animation ----------------------------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.home-hero     { animation: fadeUp 0.6s ease both; }
.posts-section { animation: fadeUp 0.6s 0.15s ease both; }
.post-header   { animation: fadeUp 0.5s ease both; }
.post-body     { animation: fadeUp 0.5s 0.1s ease both; }

/* -- Responsive ------------------------------------------ */
@media (max-width: 900px) {
  .post-layout {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  .toc-sidebar {
    order: -1;
    padding: var(--space-lg);
    background: var(--color-tag-bg);
    border-radius: var(--radius);
  }
  .toc-sticky { position: static; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --space-xl: 1.5rem; --space-2xl: 2.5rem; --space-3xl: 3.5rem; }
  .container { padding-inline: var(--space-lg); }

  .nav-list { display: none; flex-direction: column; gap: 0; }
  .nav-list.open {
    display: flex;
    position: absolute;
    top: var(--header-height);
    left: 0; right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-xl);
  }
  .nav-link { padding: var(--space-sm) 0; font-size: 1rem; }
  .nav-link::after { display: none; }
  .nav-toggle { display: flex; }

  .posts-grid { grid-template-columns: 1fr; }
  .post-nav   { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-xl); }
  .hero-decoration { display: none; }
}