/* ============================================================
   RETRO PIXEL BLOG — main.css
   ============================================================ */

/* ===== Korean font scaling inside pixel-font contexts =====
   size-adjust scales only the Korean fallback glyphs, so
   English stays at the declared font-size while Korean renders
   visually larger and cleaner.
   ========================================================== */
@font-face {
  font-family: 'KoreanUI';
  src: local('Apple SD Gothic Neo'), local('Malgun Gothic'), local('Noto Sans KR');
  unicode-range: U+AC00-D7A3, U+1100-11FF, U+3130-318F, U+A960-A97F, U+D7B0-D7FF;
  size-adjust: 140%;
}

/* ===== CSS Variables ===== */
:root {
  --ai-note-bg: #ebebeb;
  --bg:        #f0ebe1;
  --surface:   #fffef7;
  --fg:        #1e1a2e;
  --muted:     #6e6882;
  --border:    #1e1a2e;
  --shadow:    #1e1a2e;
  --accent:    #c1121f;
  --accent2:   #1a5fb4;
  --tag-bg:    #e8deff;
  --tag-fg:    #3b0f8a;
  --code-bg:   #e4dcc2;
  --scroll-indicator-bg: #f5f3ed;

  --pixel-font: 'Jersey 10', 'KoreanUI', "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  --body-font:  -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
                "Malgun Gothic", "Noto Sans KR", sans-serif;
  --mono-font:  "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --max-width: 760px;
  --sh: 4px;   /* shadow offset */
}

[data-theme="dark"] {
  --ai-note-bg: #252535;
  --bg:       #0d0b1a;
  --surface:  #1a1730;
  --fg:       #f3efff;
  --muted:    #d6d1e9;
  --border:   #8f87c4;
  --shadow:   #8f87c4;
  --accent:   #8a6cc0;
  --accent2:  #60a5fa;
  --tag-bg:   #2d2060;
  --tag-fg:   #c4b5fd;
  --code-bg:  #231f3d;
  --scroll-indicator-bg: #1a1730;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--body-font);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.2s ease, color 0.2s ease;
}

a { color: var(--accent2); text-decoration: none; }
a:hover { color: var(--accent); }

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.main-content {
  flex: 1;
  padding: 3rem 0;
  padding-bottom: calc(3rem + 50px); /* fixed footer 높이 확보 */
}

/* ===== Header ===== */
.site-header {
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  box-shadow: 0 var(--sh) 0 var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.2s ease;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 54px;
}

.site-title {
  font-family: var(--pixel-font);
  font-size: 28px;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: 0.04em;
  line-height: 1;
  flex-shrink: 0;
}
.site-title:hover { color: var(--accent); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Shared button style */
.nav-btn,
#theme-toggle {
  font-family: var(--pixel-font);
  font-size: 20px;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  background: var(--bg);
  color: var(--muted);
  border: 2px solid var(--border);
  box-shadow: 2px 2px 0 var(--shadow);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: transform 0.08s, box-shadow 0.08s, color 0.1s;
  user-select: none;
  line-height: 1;
}
.nav-btn:hover,
.nav-btn.active,
#theme-toggle:hover {
  color: var(--accent);
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 var(--shadow);
  text-decoration: none;
}
.nav-btn:active,
#theme-toggle:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--shadow);
}
.nav-btn.active { color: var(--accent); }

/* Theme toggle icon switching */
#theme-toggle .icon-sun  { display: none; }
#theme-toggle .icon-moon { display: inline; }

[data-theme="dark"] #theme-toggle .icon-sun  { display: inline; }
[data-theme="dark"] #theme-toggle .icon-moon { display: none; }

/* ===== Footer ===== */
.site-footer {
  background: var(--surface);
  border-top: 2px solid var(--border);
  box-shadow: 0 calc(-1 * var(--sh)) 0 var(--shadow);
  padding: 10px 0;
  text-align: center;
  transition: background 0.2s ease;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
}
.footer-text {
  font-family: var(--pixel-font);
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0.08em;
  line-height: 2;
}
.footer-text a { color: var(--muted); }
.footer-text a:hover { color: var(--accent); }

/* ===== Home / Landing ===== */
.home-hero {
  text-align: center;
  padding: 5rem 0 4rem;
}
.pixel-label {
  font-family: var(--pixel-font);
  font-size: 20px;        /* ↑ 0.55 → 0.75 */
  color: var(--accent);
  letter-spacing: 0.25em;
  display: block;
  margin-bottom: 1.5rem;
}
.home-hero h1 {
  font-family: var(--pixel-font);
  font-size: clamp(40px, 4.5vw, 1.75rem);  /* ↑ clamp(0.85, 3.5vw, 1.4) */
  line-height: 1.8;
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}
.home-hero p {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 3rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-btn {
  font-family: var(--pixel-font);
  font-size: 24px;        /* ↑ 0.55 → 0.75 */
  letter-spacing: 0.1em;
  padding: 2px 16px;
  background: var(--accent);
  color: #fff;
  border: 2px solid var(--border);
  box-shadow: var(--sh) var(--sh) 0 var(--shadow);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: transform 0.08s, box-shadow 0.08s;
}
.hero-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: calc(var(--sh) + 2px) calc(var(--sh) + 2px) 0 var(--shadow);
  color: #fff;
  text-decoration: none;
}
.hero-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--shadow);
}
.hero-btn.secondary {
  background: var(--surface);
  color: var(--fg);
}
.hero-btn.secondary:hover { color: var(--accent); }

/* ===== Sections View (All Posts) ===== */
.sections-view {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.cat-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

.cat-section-title {
  font-family: var(--pixel-font);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
}

.cat-section-posts {
  display: flex;
  flex-direction: row;
  gap: 0.875rem;
}

.cat-section-posts .post-card {
  flex: 1;
  min-width: 0;
  padding: 1rem;
}

.cat-section-posts .post-card-title {
  font-size: 0.9rem;
}

.show-more-btn {
  font-family: var(--pixel-font);
  font-size: 11px;
  color: var(--accent2);
  background: none;
  border: none;
  cursor: pointer;
  letter-spacing: 0.05em;
  padding: 0;
}

.show-more-btn:hover {
  color: var(--accent);
}

/* ===== Blog List ===== */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.post-card {
  background: var(--surface);
  border: 2px solid var(--border);
  box-shadow: var(--sh) var(--sh) 0 var(--shadow);
  padding: 1.5rem;
  transition: transform 0.08s, box-shadow 0.08s;
}
.post-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: calc(var(--sh) + 2px) calc(var(--sh) + 2px) 0 var(--shadow);
  border: 2px solid var(--accent)
}

.post-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.4rem;
}
.post-card-title a { color: var(--fg); }
.post-card-title a:hover { color: var(--accent); }

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
  color: var(--muted);
}
.post-card-meta time {
  font-family: var(--pixel-font);
  font-size: 15px;        /* ↑ 0.48 → 0.65 */
  letter-spacing: 0.05em;
}

.tag {
  font-family: var(--pixel-font);
  font-size: 7px;         /* ↑ 0.42 → 0.6 */
  /* letter-spacing: 0.05em; */
  padding: 5px 3.8px 1px 3.8px;
  background: var(--tag-bg);
  color: var(--tag-fg);
  border: 1px solid var(--border);
}

.post-card-excerpt {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
  margin-bottom: 0.75rem;
}

.post-card-read-more {
  font-family: var(--pixel-font);
  font-size: 15px;        /* ↑ 0.48 → 0.65 */
  color: var(--accent2);
  letter-spacing: 0.05em;
}
.post-card-read-more:hover { color: var(--accent); }

/* ===== Post ===== */
.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--border);
}
.post-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.post-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  color: var(--muted);
}
.post-meta time {
  font-family: var(--pixel-font);
  font-size: 15px;        /* ↑ 0.48 → 0.65 */
  letter-spacing: 0.05em;
}

.lang-toggle-group {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: auto;
}

.lang-toggle-btn {
  font-family: var(--pixel-font);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  background: var(--bg);
  color: var(--accent2);
  border: 2px solid var(--accent2);
  box-shadow: 2px 2px 0 var(--accent2);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: transform 0.08s, box-shadow 0.08s, color 0.1s;
  line-height: 1;
}
.lang-toggle-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 2px 2px 0 var(--accent);
  transform: translate(-1px, -1px);
  text-decoration: none;
}
.lang-toggle-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--accent2);
}

.lang-help {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  cursor: default;
  color: var(--muted);
  line-height: 1;
}
.lang-tooltip {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  background: var(--surface);
  color: var(--fg);
  border: 2px solid var(--border);
  font-family: var(--body-font);
  font-size: 11px;
  font-style: normal;
  letter-spacing: 0;
  padding: 5px 8px;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 200;
}
.lang-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--border);
}
.lang-tooltip::before {
  content: '';
  position: absolute;
  top: calc(100% - 2px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--surface);
  z-index: 1;
}
.lang-help:hover .lang-tooltip {
  visibility: visible;
  opacity: 1;
}

.post-content { line-height: 1.85; }

.post-content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}
.post-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}
.post-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
}
.post-content p { margin-bottom: 1.25rem; }
.post-content ul,
.post-content ol { margin-bottom: 1.25rem; padding-left: 1.5rem; }
.post-content li { margin-bottom: 0.3rem; }

.post-content blockquote {
  border-left: 4px solid var(--accent);
  background: var(--surface);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.85rem;
}
.post-content blockquote p { margin: 0; color: #555; font-style: italic; }
[data-theme="dark"] .post-content blockquote p { color: var(--muted); }

.post-content code {
  font-family: var(--mono-font);
  font-size: 0.875em;
  background: var(--code-bg);
  padding: 0.15em 0.45em;
}
.post-content pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
.post-content pre::before {
  content: '> ';
  font-family: var(--pixel-font);
  font-size: 0.7rem;         /* ↑ 0.5 → 0.7 */
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
}
.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.6;
}
.post-content img {
  max-width: 100%;
  border: 2px solid var(--border);
  margin: 1rem auto;
  display: block;
}
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.25rem;
  border: 2px solid var(--border);
  font-size: 0.75rem;
}
.post-content th,
.post-content td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
}
.post-content th {
  background: var(--code-bg);
  font-family: var(--body-font);
  font-size: 0.875em;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.post-content hr {
  border: none;
  border-top: 2px solid var(--border);
  margin: 2rem 0;
}

/* ===== Post TOC ===== */
.post-toc {
  position: fixed;
  top: 84px;
  width: 160px;
  max-height: calc(100vh - 180px);
  overflow-y: auto;
  background: var(--surface);
  border: 2px solid var(--border);
  z-index: 90;
  visibility: hidden;
  transition: background 0.2s;
}
.post-toc::-webkit-scrollbar { width: 3px; }
.post-toc::-webkit-scrollbar-thumb { background: var(--border); }

.toc-header {
  font-family: var(--pixel-font);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--accent);
  padding: 4px 10px;
  background: var(--code-bg);
  border-bottom: 2px solid var(--border);
}

.toc-list {
  list-style: none;
  padding: 4px 0;
}
.toc-list li { border-bottom: 1px solid var(--border); }
.toc-list li:last-child { border-bottom: none; }
.toc-list a {
  display: block;
  padding: 5px 10px;
  font-size: 0.7rem;
  color: var(--muted);
  text-decoration: none;
  line-height: 1.4;
  transition: color 0.1s, background 0.1s;
  word-break: keep-all;
}
.toc-list a:hover {
  color: var(--fg);
  background: var(--code-bg);
}
.toc-list a.toc-active {
  color: var(--accent);
  font-weight: 700;
  background: var(--code-bg);
}

.post-ai-note {
  font-size: 0.7rem;
  background: var(--ai-note-bg);
  color: var(--muted);
  padding: 0.5rem 0.9rem;
  margin-top: 2.5rem;
}

.post-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--border);
}
.back-btn {
  font-family: var(--pixel-font);
  font-size: 15px;         /* ↑ 0.5 → 0.7 */
  letter-spacing: 0.06em;
  padding: 2px 8px;
  color: var(--fg);
  background: var(--surface);
  border: 2px solid var(--border);
  box-shadow: 3px 3px 0 var(--shadow);
  display: inline-block;
  transition: transform 0.08s, box-shadow 0.08s;
}
.back-btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--shadow);
  border: 2px solid var(--accent);
  color: var(--accent);
}

/* ===== About / CV ===== */
.about-header {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border);
}
.about-avatar {
  width: 180px;
  height: 180px;
  background: var(--code-bg);
  border: 2px solid var(--border);
  box-shadow: var(--sh) var(--sh) 0 var(--shadow);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  line-height: 1;
  overflow: hidden;
}
.about-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.about-intro h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 0.3rem;
}
.about-role {
  font-family: var(--pixel-font);
  font-size: 18px;         /* ↑ 0.5 → 0.7 */
  color: var(--accent);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 0.75rem;
}
.about-intro p {
  color: var(--muted);
  font-size: 16px;
  margin-bottom: 18px;
  line-height: 1.7;
}
.about-links { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.about-link {
  font-family: var(--pixel-font);
  font-size: 14px;        /* ↑ 0.45 → 0.62 */
  letter-spacing: 0.06em;
  padding: 1px 6px;
  border: 2px solid var(--border);
  box-shadow: 2px 2px 0 var(--shadow);
  color: var(--fg);
  display: inline-block;
  transition: transform 0.08s, box-shadow 0.08s;
}
.about-link:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 var(--shadow);
  color: var(--accent);
}

.cv-section { margin-bottom: 2.5rem; }
.cv-section-title {
  font-family: var(--pixel-font);
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.cv-section-title::before { content: '▶'; }

.cv-item {
  margin-bottom: 1.5rem;
  padding-left: 1rem;
  border-left: 3px solid var(--border);
}
.cv-item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.3rem;
}
.cv-item-title { font-weight: 700; font-size: 1rem; }
.cv-item-sub { color: var(--accent2); font-size: 0.9rem; }
.cv-item-date {
  font-family: var(--pixel-font);
  font-size: 14px;         /* ↑ 0.42 → 0.6 */
  color: var(--muted);
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.cv-item p,
.cv-item ul {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.35rem;
  line-height: 1.7;
}
.cv-item ul { padding-left: 1.2rem; }
.cv-item li { margin-bottom: 0.2rem; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0.9rem;
}
.skill-group {
  background: var(--surface);
  border: 2px solid var(--border);
  box-shadow: 3px 3px 0 var(--shadow);
  padding: 6px 14px;
}
.skill-group-name {
  font-family: var(--pixel-font);
  font-size: 18px;
  font-weight: 500;
  color: var(--accent2);
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}
.skill-group-items {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.65;
}

.page-content p { margin-bottom: 1rem; color: var(--muted); }

/* ===== Blog Two-Column Layout ===== */
.blog-layout {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  align-items: start;
}

/* ===== Category Sidebar ===== */
.category-sidebar {
  background: var(--surface);
  border: 2px solid var(--border);
  position: sticky;
  top: 84px;
  max-height: calc(100vh - 104px);
  overflow-y: auto;
  transition: background 0.2s;
}

/* custom scrollbar */
.category-sidebar::-webkit-scrollbar { width: 4px; }
.category-sidebar::-webkit-scrollbar-track { background: var(--bg); }
.category-sidebar::-webkit-scrollbar-thumb { background: var(--border); }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--pixel-font);
  font-size: 24px;        /* sidebar: slightly smaller */
  color: var(--accent);
  letter-spacing: 0.15em;
  padding: 1px 16px;
  background: var(--code-bg);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
}

.sidebar-mobile-toggle {
  display: none;
  font-family: var(--pixel-font);
  font-size: 0.75rem;        /* ↑ 0.55 → 0.75 */
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.cat-tree-wrap.mobile-hidden { display: none; }

.cat-tree {
  list-style: none;
  padding: 0.4rem 0;
}

.cat-item { position: relative; }

.cat-row {
  display: flex;
  align-items: center;
}

/* Toggle arrow */
.cat-toggle {
  flex-shrink: 0;
  width: 1.6rem;
  font-family: var(--body-font);
  font-size: 0.85rem;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem 0 0.5rem 0.75rem;
  line-height: 1;
  transition: color 0.1s;
}
.cat-toggle:hover { color: var(--accent); }

/* Indent placeholder for leaf nodes */
.cat-indent {
  flex-shrink: 0;
  width: 1.6rem;
}


/* Category name button */

.cat-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem 0.5rem 0;
  font-family: var(--pixel-font);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  line-height: 1.6;
  transition: color 0.1s, background 0.1s;
  border-radius: 0;
}
.cat-btn:hover {
  color: var(--fg);
  background: var(--code-bg);
}
.cat-btn.active { color: var(--accent); }

.cat-count {
  font-family: var(--pixel-font);
  font-size: 14px;        /* sidebar: slightly smaller */
  color: var(--fg);
  opacity: 0.7;
  min-width: 1.2em;
  text-align: right;
  flex-shrink: 0;
  padding-right: 0.75rem;
}

/* ALL POSTS 좌측 여백 */
.cat-tree > .cat-item:first-child .cat-btn { padding-left: 0.75rem; }

/* Level indentation */
.level-1 > .cat-row > .cat-btn { padding-left: 0; }
.level-2 > .cat-row > .cat-toggle,
.level-2 > .cat-row > .cat-indent { padding-left: 1.1rem; width: 2.7rem; }
.level-3 > .cat-row > .cat-indent { padding-left: 2.2rem; width: 3.8rem; }

.cat-subtree {
  list-style: none;
}
.cat-subtree.collapsed { display: none; }

/* Blog main section */
.blog-main { min-width: 0; }

.blog-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border);
}
#blog-current-cat {
  font-family: var(--pixel-font);
  font-size: 1.1rem;         /* ↑ 0.85 → 1.1 */
  letter-spacing: 0.08em;
}

.no-posts-msg {
  font-family: var(--pixel-font);
  font-size: 0.7rem;         /* ↑ 0.5 → 0.7 */
  letter-spacing: 0.1em;
  color: var(--muted);
  text-align: center;
  padding: 3rem 0;
}

/* ===== Scroll Indicator ===== */
.scroll-indicator {
  position: fixed;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 5px 9px;
  background: var(--scroll-indicator-bg);
  font-family: var(--pixel-font);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.35s ease;
}

.scroll-arrows {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0px;
  line-height: 1;
  overflow: hidden;
}

.scroll-arrows span {
  display: block;
  font-size: 14px;
  line-height: 1.1;
}

/* Scroll Down: reveal arrows top-to-bottom, hold, fade, repeat */
.scroll-indicator:not(.at-bottom) .scroll-arrows {
  animation: arrows-reveal 1.6s ease-in-out infinite;
}

@keyframes arrows-reveal {
  0%         { clip-path: inset(0 0 100% 0); opacity: 0.4; }
  40%        { clip-path: inset(0 0 0%   0); opacity: 1;   }
  72%        { clip-path: inset(0 0 0%   0); opacity: 1;   }
  90%, 100%  { clip-path: inset(0 0 100% 0); opacity: 0.4; }
}

/* End of Page: no animation, arrows fully visible */
.scroll-indicator.at-bottom .scroll-arrows {
  animation: none;
  clip-path: none;
  opacity: 1;
}
.scroll-indicator.at-bottom .scroll-text {
  color: var(--accent);
}

/* ===== Tetris Background (home page only) ===== */
#tetris-bg {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  /* height는 JS에서 footer top까지로 직접 설정 */
  z-index: 0;
  pointer-events: none;
}
body.has-tetris .main-content {
  position: relative;
  z-index: 1;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .blog-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .category-sidebar {
    position: static;
    max-height: none;
  }
  .sidebar-mobile-toggle { display: block; }

  /* 섹션뷰 포스트: 가로 3열 → 세로 1열 */
  .cat-section-posts {
    flex-direction: column;
  }
  .cat-section-posts .post-card {
    flex: none;
  }
}

@media (max-width: 560px) {
  /* 상단바: 글자 키움 */
  .site-title { font-size: 1.1rem; }
  .nav-btn, #theme-toggle { font-size: 0.75rem; padding: 4px 10px; }

  /* 하단바: 줄임 */
  .site-footer { padding: 4px 0; }
  .footer-text { font-size: 11px; line-height: 1.4; }

  .about-header { flex-direction: column; align-items: center; text-align: center; }
  .about-links { justify-content: center; }
  .cv-item-header { flex-direction: column; gap: 0.15rem; }
  .post-header h1 { font-size: 1.35rem; }
  .home-hero { padding: 3.5rem 0 3rem; }
}