/* ============================================================
   NEO-C64 THEME — Main Stylesheet
   Commodore 64 · PEPTO palette · Brutalist · Always dark
   ============================================================ */

/* ── 1. VARIABLES ───────────────────────────────────────── */
:root {
  /* Authentic C64 PEPTO palette */
  --c64-bg:       #070720;
  --c64-panel:    #0D0D2A;
  --c64-code-bg:  #000010;
  --c64-text:     #C0C8FF;
  --c64-text-dim: #4A5090;
  --c64-border:   #1E1E50;

  --c64-black:    #000000;
  --c64-white:    #FFFFFF;
  --c64-red:      #813338;
  --c64-cyan:     #75CEC8;
  --c64-purple:   #8E3C97;
  --c64-green:    #56AC4D;
  --c64-blue:     #2E2C9B;
  --c64-yellow:   #EDF171;
  --c64-orange:   #8E5029;
  --c64-lred:     #C46C71;
  --c64-lgray:    #B2B2B2;
  --c64-mgray:    #7B7B7B;
  --c64-dgray:    #4A4A4A;
  --c64-lblue:    #706DEB;
  --c64-lgreen:   #A9FF9F;

  /* Typography */
  --font-heading: 'Archivo Black', 'Inter', sans-serif;
  --font-body:    'JetBrains Mono', 'IBM Plex Mono', monospace;
  --font-code:    'Fira Code', monospace;

  /* Rainbow stripe colors — official C64 logo palette */
  --stripe-red:    #EC1C24;
  --stripe-orange: #F16541;
  --stripe-yellow: #FFCA05;
  --stripe-green:  #50B748;
  --stripe-blue:   #00ADEE;

  /* Layout */
  --header-h:  40px;
  --transition: 0.15s ease;
}

/* ── 2. RESET ────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  height: 100%;
  overflow-x: hidden;
  background: #070720;
  /* Force browser to dark system UI — no light-mode overrides */
  color-scheme: dark;
}

body {
  height: 100%;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--c64-text);
  background: var(--c64-bg);
  -webkit-font-smoothing: antialiased;
  padding-top: var(--header-h);
}

img { max-width: 100%; height: auto; display: block; }
a   { color: var(--c64-lblue); text-decoration: none; }
a:hover { color: var(--c64-yellow); text-decoration: none; }

/* ── 3. ACCESSIBILITY ────────────────────────────────────── */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--c64-yellow);
  outline-offset: 2px;
}

/* ── 4. C64 TOPBAR (stripes + nav) ──────────────────────── */
.c64-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: var(--c64-bg);
  border-bottom: 1px solid var(--c64-border);
  display: flex;
  align-items: stretch;
  z-index: 1000;
}

/* Stripes fill the topbar height, nav sits to the right */
.rainbow-stripes {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 2px;
  padding: 3px 0;
}

.rs        { flex: 1; }
.rs-red    { background: var(--stripe-red); }
.rs-green  { background: var(--stripe-orange); }
.rs-blue   { background: var(--stripe-yellow); }
.rs-purple { background: var(--stripe-green); }
.rs-yellow { background: var(--stripe-blue); }


/* ── 6. PAGE STRUCTURE ───────────────────────────────────── */
.page-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── 7. SITE HEADER (title only — nav is in topbar) ─────── */
.site-header {
  padding: 28px 0 0;
  border-bottom: 1px solid var(--c64-border);
  padding-bottom: 20px;
  margin-bottom: 0;
}

.site-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  text-transform: uppercase;
  color: var(--c64-text);
  line-height: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-title a { color: inherit; text-decoration: none; }
.site-title a:hover { color: var(--c64-yellow); text-decoration: none; }

.site-tagline {
  font-family: var(--font-body);
  font-size: 0.6rem;
  color: var(--c64-text-dim);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-top: 6px;
}

/* ── NAV (right end of .c64-topbar) ─────────────────────── */
.main-nav {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 20px 0 16px;
  flex-shrink: 0;
  background: var(--c64-bg);
}

.nav-button {
  display: inline-block;
  padding: 0 12px;
  height: 100%;
  display: flex;
  align-items: center;
  background: transparent;
  border: none;
  color: #FFFFFF;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: color var(--transition);
  white-space: nowrap;
}

.nav-button:hover {
  color: var(--nav-hover-color, var(--c64-yellow));
  text-decoration: none;
}

.nav-button.active { color: var(--c64-yellow); }

/* ── 8. CONTENT PANEL ────────────────────────────────────── */
.content-panel {
  flex: 1;
  padding: 32px 0;
  width: 100%;
}

/* ── 9. POST CARDS (LIST) ────────────────────────────────── */
.post-card {
  padding: 7px 0;
  border-bottom: 1px solid var(--c64-border);
}

.post-card:last-of-type { border-bottom: none; }

.post-card-content {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.post-date {
  font-size: 0.65rem;
  color: var(--c64-text-dim);
  letter-spacing: 0.08em;
  white-space: nowrap;
  flex-shrink: 0;
  font-family: var(--font-body);
}

.post-card .post-title {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 0;
  line-height: 1.2;
}

.post-card .post-title a {
  color: var(--c64-text);
  text-decoration: none;
}
.post-card .post-title a:hover { color: var(--c64-yellow); }

.post-card.post-fixed   .post-title a { color: var(--c64-yellow); }
.post-card.post-collaborative .post-title a { color: #00ADEE; }
.post-card.post-horror  .post-title a { color: #EC1C24; }

.post-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
  font-family: var(--font-body);
  font-size: 0.7rem;
  color: var(--c64-text-dim);
}

.post-meta-sep { color: var(--c64-border); }

.post-excerpt {
  color: var(--c64-text-dim);
  font-size: 0.875rem;
  margin-bottom: 12px;
  line-height: 1.6;
}

.btn-secondary {
  display: inline-block;
  padding: 4px 12px;
  background: transparent;
  border: 1px solid var(--c64-border);
  color: var(--c64-text-dim);
  font-family: var(--font-body);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: all var(--transition);
}
.btn-secondary:hover {
  border-color: var(--c64-yellow);
  color: var(--c64-yellow);
}

.btn-outline {
  display: inline-block;
  padding: 7px 18px;
  background: transparent;
  border: 1px solid var(--c64-border);
  color: var(--c64-text-dim);
  font-family: var(--font-body);
  font-size: 0.8rem;
  text-decoration: none;
  transition: all var(--transition);
}
.btn-outline:hover { border-color: var(--c64-yellow); color: var(--c64-yellow); }

/* ── 10. TAG BADGES ──────────────────────────────────────── */
.post-tags,
.post-meta-bar .post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.post-tag {
  display: inline-block;
  padding: 1px 8px;
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  background: var(--c64-dgray);
  color: var(--c64-text);
  transition: all var(--transition);
}
.post-tag:hover { background: var(--c64-yellow); color: var(--c64-bg); }

/* Tag color variants by initial letter / common tags */
.post-tag[data-tag="go"],
.post-tag[data-tag="golang"]     { background: var(--c64-green);  color: var(--c64-bg); }
.post-tag[data-tag="css"],
.post-tag[data-tag="html"]       { background: var(--c64-cyan);   color: var(--c64-bg); }
.post-tag[data-tag="rant"],
.post-tag[data-tag="programming"],
.post-tag[data-tag="code"]       { background: var(--c64-orange); color: var(--c64-white); }
.post-tag[data-tag="linux"],
.post-tag[data-tag="rust"]       { background: var(--c64-lblue);  color: var(--c64-white); }

/* ── 11. RANT-O-METER GAUGE ──────────────────────────────── */
.rant-o-meter-block {
  margin: 0 0 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 16px 20px;
  background: var(--c64-panel);
  border: 1px solid var(--c64-border);
  border-left: 3px solid var(--c64-yellow);
}

.rant-gauge-large {
  width: 130px;
  height: 90px;
  flex-shrink: 0;
}

.rant-o-meter-info {
  flex: 1;
}

.rant-o-meter-type {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--c64-yellow);
  letter-spacing: -0.03em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.rant-o-meter-label {
  font-family: var(--font-body);
  font-size: 0.6rem;
  color: var(--c64-text-dim);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.acid-track {
  display: flex;
  gap: 2px;
  align-items: center;
  margin-top: 6px;
}

.acid-pip {
  width: 8px;
  height: 8px;
  background: var(--c64-border);
}
.acid-pip.active { background: var(--c64-yellow); }
.acid-pip:nth-child(8).active,
.acid-pip:nth-child(9).active,
.acid-pip:nth-child(10).active { background: var(--c64-red); }

.acid-value {
  font-family: var(--font-body);
  font-size: 0.65rem;
  color: var(--c64-yellow);
  margin-left: 6px;
}

/* ── 12. POST SINGLE ─────────────────────────────────────── */
.post-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--c64-border);
}

.post-meta {
  font-size: 0.65rem;
  color: var(--c64-text-dim);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.post-header .post-title {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 500;
  letter-spacing: -0.05em;
  text-transform: uppercase;
  color: var(--c64-text);
  line-height: 1.1;
  margin-bottom: 14px;
}

.post-header .post-title a { color: inherit; text-decoration: none; }

.post-author {
  font-size: 0.75rem;
  color: var(--c64-text-dim);
  margin-bottom: 10px;
}
.post-author strong { color: var(--c64-text); }

.post-header .post-tags {
  margin-top: 10px;
}

/* ── 13. POST CONTENT ────────────────────────────────────── */
.post-content {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c64-text);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  font-family: var(--font-heading);
  font-weight: 900;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  color: var(--c64-yellow);
  margin: 2em 0 0.6em;
  line-height: 1.1;
  scroll-margin-top: 80px;
}

.post-content h1 { font-size: 1.6rem; }
.post-content h2 { font-size: 1.3rem; border-bottom: 1px solid var(--c64-border); padding-bottom: 4px; }
.post-content h3 { font-size: 1.1rem; color: var(--c64-text); }
.post-content h4 { font-size: 0.95rem; color: var(--c64-text-dim); }

.post-content p { margin-bottom: 1.3em; }

.post-content a { color: var(--c64-lblue); text-decoration: underline; text-underline-offset: 3px; }
.post-content a:hover { color: var(--c64-yellow); }

.post-content strong { color: var(--c64-text); font-weight: 700; }
.post-content em     { color: var(--c64-text-dim); font-style: italic; }

.post-content ul,
.post-content ol { padding-left: 1.5em; margin-bottom: 1.3em; }
.post-content li { margin-bottom: 0.4em; }
.post-content ul li::marker { color: var(--c64-yellow); }
.post-content ol li::marker { color: var(--c64-yellow); }

.post-content blockquote {
  border-left: 3px solid var(--c64-yellow);
  padding: 10px 18px;
  margin: 1.4em 0;
  background: var(--c64-panel);
  color: var(--c64-text-dim);
  font-style: italic;
}
.post-content blockquote p { margin-bottom: 0; }

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4em 0;
  font-size: 0.875rem;
}
.post-content th,
.post-content td { border: 1px solid var(--c64-border); padding: 7px 12px; text-align: left; }
.post-content th  { background: var(--c64-panel); color: var(--c64-yellow); font-family: var(--font-heading); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; }

.post-content img { max-width: 100%; border: 1px solid var(--c64-border); margin: 1.4em 0; }
.post-content .post-image-clickable { cursor: zoom-in; }

.post-content iframe { width: 100%; aspect-ratio: 16 / 9; height: auto; border: none; margin: 1.4em 0; display: block; }

/* PETSCII HR */
.post-content hr {
  border: none;
  margin: 2.2em 0;
  height: 1em;
  overflow: hidden;
  font-family: var(--font-code);
  font-size: 0.65rem;
  color: var(--c64-border);
  letter-spacing: 0;
  line-height: 1;
}
.post-content hr::before {
  content: '█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░█░';
}

/* ── 14. INLINE TOC ──────────────────────────────────────── */
.table-of-contents {
  background: var(--c64-panel);
  border: 1px solid var(--c64-border);
  border-left: 3px solid var(--c64-yellow);
  padding: 18px 22px;
  margin: 0 0 28px;
  font-size: 0.875rem;
}
.table-of-contents nav > ul,
.table-of-contents ul { list-style: none; padding-left: 0; margin: 0; }
.table-of-contents ul ul { padding-left: 1.1em; margin-top: 3px; }
.table-of-contents li  { margin-bottom: 3px; }
.table-of-contents a   { color: var(--c64-text-dim); text-decoration: none; font-size: 0.78rem; }
.table-of-contents a:hover { color: var(--c64-yellow); }
.table-of-contents > nav > ul > li::before { content: '▸ '; color: var(--c64-yellow); }

/* ── 15. TOC SIDEBAR ─────────────────────────────────────── */
.toc-sidebar {
  position: fixed;
  top: calc(var(--header-h) + 12px);
  right: 16px;
  width: 220px;
  max-height: calc(100vh - 100px);
  background: var(--c64-bg);
  border: 1px solid var(--c64-border);
  display: none;
  flex-direction: column;
  z-index: 90;
  overflow: hidden;
}
.toc-sidebar__header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--c64-border);
  background: var(--c64-panel);
  flex-shrink: 0;
}
.toc-sidebar__icon { width: 13px; height: 13px; color: var(--c64-yellow); flex-shrink: 0; }
.toc-sidebar__title { font-family: var(--font-body); font-size: 0.6rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--c64-yellow); flex: 1; }
.toc-sidebar__toggle { background: none; border: none; cursor: pointer; color: var(--c64-text-dim); padding: 0; display: none; }
.toc-sidebar__nav { overflow-y: auto; flex: 1; padding: 10px 0; scrollbar-width: thin; scrollbar-color: var(--c64-border) transparent; }
.toc-sidebar__list { list-style: none; padding: 0; margin: 0; }
.toc-sidebar__item { border-left: 2px solid transparent; }
.toc-sidebar__item--nested { padding-left: 10px; }
.toc-sidebar__link { display: block; padding: 4px 12px; color: var(--c64-text-dim); font-family: var(--font-body); font-size: 0.7rem; line-height: 1.4; text-decoration: none; transition: color var(--transition); }
.toc-sidebar__link:hover { color: var(--c64-yellow); }
.toc-sidebar__link--active { color: var(--c64-yellow) !important; border-left: 2px solid var(--c64-yellow); margin-left: -2px; }

body.has-toc-sidebar .page-container { padding-right: calc(32px + 244px); }

/* ── 16. CODE BLOCKS ─────────────────────────────────────── */
.post-content code {
  font-family: var(--font-code);
  font-feature-settings: "liga" 1;
  font-size: 0.875em;
  background: var(--c64-code-bg);
  border: 1px solid var(--c64-border);
  padding: 2px 5px;
  color: var(--c64-yellow);
}
.post-content pre {
  background: var(--c64-code-bg);
  border: 1px solid var(--c64-border);
  padding: 18px 20px;
  margin: 1.4em 0;
  overflow-x: auto;
}
.post-content pre code { background: none; border: none; padding: 0; font-size: 0.875rem; line-height: 1.6; color: var(--c64-text); }

/* Chroma — C64 palette */
.chroma { background: var(--c64-code-bg) !important; color: var(--c64-text) !important; }
.chroma .k,.chroma .kc,.chroma .kd,.chroma .kn,.chroma .kp,.chroma .kr,.chroma .kt { color: var(--c64-yellow) !important; }
.chroma .s,.chroma .sa,.chroma .sb,.chroma .sc,.chroma .s2,.chroma .s1             { color: var(--c64-lgreen) !important; }
.chroma .c,.chroma .c1,.chroma .cm,.chroma .cs                                     { color: var(--c64-mgray) !important; font-style: italic; }
.chroma .nf,.chroma .fm                                                             { color: var(--c64-cyan) !important; }
.chroma .nb                                                                         { color: var(--c64-purple) !important; }
.chroma .mi,.chroma .mf,.chroma .mo                                                 { color: var(--c64-lred) !important; }
.chroma .o,.chroma .p                                                               { color: var(--c64-text-dim) !important; }

/* ── 17. SHORTCODES ──────────────────────────────────────── */
.c64-codeblock {
  background: var(--c64-code-bg);
  border: 1px solid var(--c64-border);
  margin: 1.4em 0;
  overflow: hidden;
}
.c64-codeblock__header {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  background: var(--c64-panel);
  border-bottom: 1px solid var(--c64-border);
}
.c64-dot { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; }
.c64-dot--red    { background: var(--c64-red); }
.c64-dot--yellow { background: var(--c64-yellow); }
.c64-dot--green  { background: var(--c64-green); }
.c64-codeblock__title {
  font-family: var(--font-body);
  font-size: 0.68rem;
  color: var(--c64-yellow);
  letter-spacing: 0.1em;
  margin-left: auto;
  text-transform: uppercase;
}
.c64-codeblock__body pre { margin: 0; border: none; }

.c64-side-note {
  display: flex;
  gap: 10px;
  background: var(--c64-blue);
  border: 1px solid var(--c64-border);
  padding: 14px 18px;
  margin: 1.4em 0;
  color: #E0E0FF;
}
.c64-side-note__marker { color: var(--c64-yellow); font-size: 0.7rem; flex-shrink: 0; margin-top: 2px; }
.c64-side-note__content { font-size: 0.875rem; line-height: 1.6; }
.c64-side-note__content p { margin-bottom: 0; }

.c64-petscii-divider { margin: 2em 0; }
.c64-petscii-divider svg { width: 100%; height: auto; display: block; }

.c64-fun-fact {
  border-left: 3px solid var(--stripe-yellow);
  background: #03032A;
  padding: 14px 20px 16px;
  margin: 2em 0;
}
.c64-fun-fact__badge {
  display: inline-block;
  background: var(--stripe-yellow);
  color: #0a0a0a;
  font-family: var(--font-body);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 5px 22px 5px 12px;
  margin-bottom: 10px;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 50%, calc(100% - 10px) 100%, 0 100%);
}
.c64-fun-fact__title {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--stripe-yellow);
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}
.c64-fun-fact__content { font-size: 0.9rem; line-height: 1.65; color: var(--c64-text); }
.c64-fun-fact__content p:last-child { margin-bottom: 0; }
.c64-fun-fact__content strong { color: #fff; }

/* ── 19. LANGUAGE SELECTOR ───────────────────────────────── */
.language-selector-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c64-border);
}
.language-selector-label { font-family: var(--font-body); font-size: 0.65rem; color: var(--c64-text-dim); letter-spacing: 0.1em; text-transform: uppercase; }
.language-selector { display: flex; flex-wrap: wrap; gap: 5px; align-items: center; }
.lang-btn {
  display: inline-flex; align-items: center; gap: 5px; padding: 3px 9px;
  background: transparent; border: 1px solid var(--c64-border); color: var(--c64-text-dim);
  font-family: var(--font-body); font-size: 0.65rem; letter-spacing: 0.08em; text-decoration: none;
  transition: all var(--transition);
}
.lang-btn:hover { border-color: var(--c64-yellow); color: var(--c64-yellow); }
.lang-btn.lang-btn-active { border-color: var(--c64-yellow); color: var(--c64-yellow); }
.lang-flag { width: 14px; height: 14px; object-fit: cover; }
.lang-label { font-size: 0.6rem; letter-spacing: 0.1em; }
.language-selector-mobile { display: none; }
.lang-accordion-toggle {
  display: flex; align-items: center; gap: 8px; background: transparent;
  border: 1px solid var(--c64-border); padding: 5px 12px; color: var(--c64-text-dim);
  font-family: var(--font-body); font-size: 0.72rem; cursor: pointer; width: 100%; justify-content: space-between;
}
.lang-accordion-icon { transition: transform var(--transition); font-size: 0.55rem; }
.lang-accordion-toggle[aria-expanded="true"] .lang-accordion-icon { transform: rotate(180deg); }
.lang-accordion-content { display: none; flex-direction: column; gap: 3px; padding: 6px 0; border: 1px solid var(--c64-border); border-top: none; }
.lang-accordion-content.active { display: flex; }
.lang-btn-mobile { display: inline-flex; align-items: center; gap: 7px; padding: 7px 12px; color: var(--c64-text-dim); font-family: var(--font-body); font-size: 0.72rem; text-decoration: none; transition: color var(--transition); }
.lang-btn-mobile:hover { color: var(--c64-yellow); }
.lang-btn-mobile.lang-btn-active { color: var(--c64-yellow); }

/* ── 20. PAGINATION ──────────────────────────────────────── */
.pagination {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  justify-content: space-between; margin-top: 28px; padding-top: 20px;
  border-top: 1px solid var(--c64-border); font-family: var(--font-body); font-size: 0.78rem;
}
.pagination a { color: var(--c64-text-dim); border: 1px solid var(--c64-border); padding: 5px 12px; text-decoration: none; transition: all var(--transition); }
.pagination a:hover { border-color: var(--c64-yellow); color: var(--c64-yellow); }
.pagination .current { background: var(--c64-yellow); color: var(--c64-bg); padding: 5px 12px; font-weight: 700; }

/* ── 21. FOOTER ──────────────────────────────────────────── */
.site-footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--c64-border);
  margin-top: auto;
}


.footer-main {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-left .footer-site-name {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: var(--c64-text);
  margin-bottom: 6px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

.footer-nav a {
  color: var(--c64-text-dim);
  font-family: var(--font-body);
  font-size: 0.7rem;
  text-decoration: none;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--c64-yellow); }
.footer-nav-sep { color: var(--c64-border); font-size: 0.7rem; }

.footer-stripe {
  display: flex;
  height: 3px;
  width: 120px;
  margin-top: 16px;
  align-self: flex-end;
}
.footer-stripe span { flex: 1; }
.footer-stripe .fs-red    { background: var(--c64-red); }
.footer-stripe .fs-orange { background: var(--c64-orange); }
.footer-stripe .fs-yellow { background: var(--c64-yellow); }
.footer-stripe .fs-green  { background: var(--c64-green); }
.footer-stripe .fs-cyan   { background: var(--c64-cyan); }
.footer-stripe .fs-lblue  { background: var(--c64-lblue); }
.footer-stripe .fs-purple { background: var(--c64-purple); }

.footer-copy,
.footer-credit {
  font-size: 0.65rem;
  color: var(--c64-text-dim);
  margin-top: 3px;
  opacity: 0.6;
}

/* ── 22. IMAGE LIGHTBOX ──────────────────────────────────── */
.image-lightbox-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,5,0.96);
  z-index: 9000; display: flex;
  align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease;
}
.image-lightbox-overlay.is-active { opacity: 1; pointer-events: auto; }
.image-lightbox-inner { position: relative; max-width: 90vw; max-height: 90vh; overflow: hidden; }
.image-lightbox-image { max-width: 90vw; max-height: 85vh; object-fit: contain; display: block; cursor: default; transition: transform 0.1s ease; }
.image-lightbox-image.is-zoomed { cursor: grab; }
.image-lightbox-image.is-dragging { cursor: grabbing; }
.image-lightbox-controls { position: absolute; top: 8px; right: 8px; display: flex; gap: 5px; opacity: 0; transition: opacity 0.2s ease; pointer-events: none; }
.image-lightbox-zoom-btn,
.image-lightbox-close { background: var(--c64-bg); border: 1px solid var(--c64-border); color: var(--c64-text); width: 30px; height: 30px; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 1rem; transition: all var(--transition); }
.image-lightbox-zoom-btn:hover,
.image-lightbox-close:hover { background: var(--c64-yellow); color: var(--c64-bg); border-color: var(--c64-yellow); }

/* ── 23. RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 1300px) {
  .toc-sidebar { display: none !important; }
  body.has-toc-sidebar .page-container { padding-right: 32px; }
}

@media (max-width: 1024px) {
  .toc-sidebar {
    position: fixed; bottom: 0; top: auto; right: 0; left: 0; width: 100%;
    max-height: 50vh; z-index: 200; border-top: 2px solid var(--c64-yellow);
    transform: translateY(100%); transition: transform 0.3s ease;
  }
  .toc-sidebar.toc-sidebar--expanded { transform: translateY(0); display: flex !important; }
  .toc-sidebar__toggle { display: flex; align-items: center; justify-content: center; width: 26px; height: 26px; }
  body.has-toc-sidebar .page-container { padding-right: 32px; }
}

@media (max-width: 768px) {
  /* 44px topbar = better touch target; drives body padding-top + toc-sidebar top via --header-h */
  :root { --header-h: 44px; }

  /* Prevent nav wrapping — wrapping pushes page content under the fixed topbar.
     Scroll horizontally instead so all links stay on one line. */
  .main-nav {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 0 8px;
  }
  .main-nav::-webkit-scrollbar { display: none; }
  .nav-button { padding: 0 10px; font-size: 0.68rem; flex-shrink: 0; }

  .page-container { padding: 0 16px; }
  .site-header { padding: 20px 0 16px; }
  .site-title { font-size: 1.6rem; }
  .content-panel { padding: 24px 0; }

  .post-card-content { gap: 10px; }
  .post-date { font-size: 0.6rem; }

  /* Prevent wide code blocks from breaking layout */
  pre, pre code { overflow-x: auto; -webkit-overflow-scrolling: touch; }

  .language-selector { display: none; }
  .language-selector-mobile { display: block; width: 100%; }
  .language-selector-wrapper { flex-direction: column; align-items: flex-start; }
  .sid-waveform-container { display: none; }
}

@media (max-width: 600px) {
  .site-title { font-size: 1.4rem; }
  .site-tagline { font-size: 0.52rem; letter-spacing: 0.15em; }

  .post-card .post-title { font-size: 0.88rem; }
  .post-date { font-size: 0.58rem; }

  .footer-main { flex-direction: column; gap: 16px; }
  .footer-stripe { width: 100%; }

  .post-content h1 { font-size: 1.5rem; }
  .post-content h2 { font-size: 1.25rem; }
  .post-content h3 { font-size: 1.1rem; }
}