/* =============================================================================
   meta-archives.xyz — Pure Index Style
   
   Concept: 책 뒤의 색인(index) 페이지처럼 텍스트만으로 구성된 최소한의 디자인.
   Reference: gwern.net, 실제 학술서적 색인
   ============================================================================= */

/* -----------------------------------------------------------------------------
   Variables
   ----------------------------------------------------------------------------- */
:root {
  --bg: #fff;
  --text: #111;
  --muted: #666;
  --border: #111;
}

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

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, 
               "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  -webkit-font-smoothing: antialiased;
}

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

/* -----------------------------------------------------------------------------
   Typography
   ----------------------------------------------------------------------------- */
h1, h2, h3 {
  font-weight: 600;
  line-height: 1.4;
}

h1 {
  font-size: 1rem;
}

h2 {
  font-size: 1rem;
  margin: 2.5rem 0 1rem;
}

h3 {
  font-size: 1rem;
  margin: 1.5rem 0 0.75rem;
}

p {
  margin-bottom: 1rem;
}

/* Links: 색상 변화 없음, 호버 시 밑줄만 */
a {
  color: var(--text);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.5rem;
}

/* -----------------------------------------------------------------------------
   Divider
   ----------------------------------------------------------------------------- */
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* -----------------------------------------------------------------------------
   Header
   ----------------------------------------------------------------------------- */
header {
  margin-bottom: 2rem;
}

header h1 {
  margin-bottom: 0.25rem;
}

header .tagline {
  color: var(--muted);
  font-size: 0.875rem;
}

header nav {
  margin-top: 1rem;
  font-size: 0.875rem;
}

header nav a {
  color: var(--muted);
  margin-right: 1rem;
}

header nav a:hover {
  color: var(--text);
}

/* -----------------------------------------------------------------------------
   Category Filter
   ----------------------------------------------------------------------------- */
.filter {
  margin-bottom: 2rem;
  font-size: 0.875rem;
}

.filter a {
  color: var(--muted);
  margin-right: 1.25rem;
}

.filter a:hover {
  color: var(--text);
}

.filter a.active {
  color: var(--text);
  font-weight: 600;
}

/* -----------------------------------------------------------------------------
   Index List (메인 페이지 글 목록)
   ----------------------------------------------------------------------------- */
.index {
  list-style: none;
  padding: 0;
}

.index li {
  margin-bottom: 1.5rem;
}

.index .category {
  display: block;
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.index li a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.index .title {
  flex: 1;
}

.index .date {
  color: var(--muted);
  font-size: 0.875rem;
  flex-shrink: 0;
}

.index .meta {
  padding-left: 1rem;
  margin-top: 0.25rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

.index .meta .tag {
  margin-right: 0.5rem;
}

.index .meta .tag::before {
  content: "·";
  margin-right: 0.5rem;
}

.index .meta .tag:first-child::before {
  content: "";
  margin-right: 0;
}

/* Status badge */
.status {
  font-size: 0.75rem;
  color: var(--muted);
}

/* -----------------------------------------------------------------------------
   Detail Page — Header
   ----------------------------------------------------------------------------- */
.detail-header {
  margin-bottom: 2rem;
}

.detail-header .back {
  font-size: 0.875rem;
  color: var(--muted);
  display: block;
  margin-bottom: 1.5rem;
}

.detail-header .back:hover {
  color: var(--text);
}

.detail-header h1 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.detail-header .meta {
  font-size: 0.875rem;
  color: var(--muted);
}

.detail-header .meta a {
  color: var(--muted);
}

.detail-header .meta a:hover {
  color: var(--text);
}

/* -----------------------------------------------------------------------------
   Detail Page — Metadata Box
   ----------------------------------------------------------------------------- */
.metadata {
  margin: 2rem 0;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, 
               "Liberation Mono", monospace;
}

.metadata dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 1.5rem;
}

.metadata dt {
  color: var(--muted);
}

.metadata dd {
  margin: 0;
}

.metadata a {
  color: var(--text);
}

/* -----------------------------------------------------------------------------
   Article Content
   ----------------------------------------------------------------------------- */
article {
  margin-top: 2rem;
}

article h2 {
  margin: 2.5rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

article h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

article p {
  margin-bottom: 1rem;
}

article ul, article ol {
  margin-bottom: 1rem;
  padding-left: 1.25rem;
}

article blockquote {
  margin: 1.5rem 0;
  padding-left: 1rem;
  border-left: 2px solid var(--border);
  color: var(--muted);
}

article pre {
  background: #f5f5f5;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}

article code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, 
               "Liberation Mono", monospace;
  font-size: 0.9em;
  background: #f5f5f5;
  padding: 0.1rem 0.3rem;
}

article pre code {
  background: none;
  padding: 0;
}

/* -----------------------------------------------------------------------------
   Highlight Box (선택적)
   ----------------------------------------------------------------------------- */
.highlight {
  margin: 1.5rem 0;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.highlight p:last-child {
  margin-bottom: 0;
}

/* -----------------------------------------------------------------------------
   Footer
   ----------------------------------------------------------------------------- */
footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--muted);
}

footer a {
  color: var(--muted);
}

footer a:hover {
  color: var(--text);
}

footer p {
  margin-bottom: 0.5rem;
}

.footer-credit {
  margin-bottom: 1rem;
}

.footer-links {
  margin-bottom: 1rem;
}

.footer-links a {
  margin-right: 1rem;
}

.footer-updated {
  font-size: 0.8125rem;
  margin-bottom: 0;
}

/* -----------------------------------------------------------------------------
   About Page
   ----------------------------------------------------------------------------- */
.about h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.about h2:first-of-type {
  margin-top: 0;
}

/* -----------------------------------------------------------------------------
   Responsive
   ----------------------------------------------------------------------------- */
@media (max-width: 480px) {
  body {
    padding: 2rem 1rem 3rem;
  }
  
  .index li a {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  
  .index .date {
    font-size: 0.8125rem;
  }
  
  .index .meta {
    padding-left: 0;
  }
  
  .metadata dl {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .metadata dt {
    font-weight: 600;
  }
}