/* ─── Variables ──────────────────────────────────────────────────────────────── */
:root {
  /* palette */
  --bg:            #09090f;
  --bg-surface:    #0d0d18;
  --bg-card:       #111120;
  --bg-card-hover: #14142a;
  --bg-code:       #0d1117;
  --border:        #1a1a2e;
  --border-mid:    #252540;
  --border-hover:  #333360;

  /* text */
  --text:          #e4e4f0;
  --text-secondary:#a0a0c0;
  --text-muted:    #5a5a80;

  /* accent / neon */
  --cyan:          #00d4ff;
  --cyan-dim:      rgba(0, 212, 255, 0.12);
  --cyan-glow:     rgba(0, 212, 255, 0.35);
  --green:         #3dff9a;
  --green-dim:     rgba(61, 255, 154, 0.10);
  --green-glow:    rgba(61, 255, 154, 0.3);
  --yellow:        #ffd166;
  --red:           #ff6b6b;
  --purple:        #c084fc;

  /* sizes */
  --radius:        8px;
  --radius-lg:     14px;
  --header-h:      60px;
  --max-w:         1140px;
  --max-w-post:    740px;

  /* fonts */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

  /* transitions */
  --t: 150ms ease;

  /* shadows */
  --shadow-card:     0 4px 20px rgba(0,0,0,.5);
  --shadow-card-h:   0 8px 32px rgba(0,0,0,.65);
  --shadow-terminal: 0 0 0 1px rgba(255,255,255,.04), 0 24px 48px rgba(0,0,0,.6);
  --shadow-glow-c:   0 0 24px var(--cyan-glow);
  --shadow-glow-g:   0 0 24px var(--green-glow);
}

/* ─── Reset ───────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
  /* subtle grid background */
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
}
a { color: var(--cyan); text-decoration: none; transition: color var(--t); }
a:hover { color: #66e3ff; }
img, video { max-width: 100%; height: auto; display: block; }

/* ─── Custom scrollbar ────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-mid); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ─── Selection ───────────────────────────────────────────────────────────────── */
::selection { background: rgba(0,212,255,.2); color: var(--text); }

/* ─── Progress bar ────────────────────────────────────────────────────────────── */
#progress-bar {
  position: fixed; top: 0; left: 0;
  height: 2px; width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--green), var(--purple));
  z-index: 1000;
  transition: width .1s linear;
  box-shadow: 0 0 10px var(--cyan-glow);
}

/* ─── Container ───────────────────────────────────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }

/* ─── Header ──────────────────────────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0;
  height: var(--header-h);
  background: rgba(9, 9, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 200;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; gap: 1.5rem;
}

/* Logo */
.site-logo {
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  display: flex; align-items: center;
}
.site-logo:hover { color: var(--text); }
.site-logo .prompt { color: var(--green); }
.site-logo .logo-text { color: var(--text); }
.site-logo .cursor {
  color: var(--cyan);
  animation: blink 1.1s step-end infinite;
  margin-left: 0.35em;
}
@keyframes blink { 50% { opacity: 0; } }

/* Glitch keyframes */
@keyframes glitch {
  0%, 100% { clip-path: none; transform: translate(0); }
  10%       { clip-path: inset(0 0 85% 0); transform: translate(-3px, 0); color: var(--cyan); }
  20%       { clip-path: inset(60% 0 0 0);  transform: translate(3px, 0);  color: var(--green); }
  30%       { clip-path: inset(30% 0 50% 0); transform: translate(-2px, 0); }
  40%       { clip-path: none; transform: translate(0); }
  55%       { clip-path: inset(10% 0 75% 0); transform: translate(2px, 0);  color: var(--purple); }
  65%       { clip-path: none; transform: translate(0); color: inherit; }
}
.site-logo:hover .logo-text {
  animation: glitch 0.45s steps(1) forwards;
}

/* Nav */
.site-nav { display: flex; align-items: center; gap: .25rem; padding-top: 6px; }
.nav-link {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--text-secondary);
  padding: .35rem .75rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: all var(--t);
}
.nav-link:hover, .nav-link.active {
  color: var(--cyan);
  background: var(--cyan-dim);
  border-color: rgba(0,212,255,.25);
}

/* Hamburger */
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: .5rem; border-radius: var(--radius);
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--text-secondary); border-radius: 2px;
  transition: all var(--t);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── Terminal window ─────────────────────────────────────────────────────────── */
.terminal-window {
  background: var(--bg-surface);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-terminal);
  font-family: var(--font-mono);
  font-size: .875rem;
  position: relative;
}
/* CRT scanlines overlay */
.terminal-window::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0, 0, 0, 0.04) 3px,
    rgba(0, 0, 0, 0.04) 4px
  );
  pointer-events: none;
  border-radius: var(--radius-lg);
  z-index: 1;
}
.terminal-titlebar {
  display: flex; align-items: center;
  padding: .625rem 1rem;
  background: rgba(255,255,255,.03);
  border-bottom: 1px solid var(--border);
  gap: .75rem;
  user-select: none;
}
.terminal-dots { display: flex; gap: 6px; }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-red    { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green  { background: #28c840; }
.terminal-title {
  flex: 1; text-align: center;
  font-size: .72rem; color: var(--text-muted);
}
.terminal-dots-spacer { width: 46px; }

.terminal-body { padding: 1.25rem 1.5rem; line-height: 2.1; }
.t-prompt { color: var(--green); margin-right: .5rem; }
.t-cmd    { color: var(--text); }
.t-out    { color: var(--text-secondary); padding-left: 1.4rem; }
.t-err    { color: var(--red); padding-left: 1.4rem; }
.t-dim    { color: var(--text-muted); font-style: italic; }
.t-yellow { color: var(--yellow); }
.t-green  { color: var(--green); }
.cursor-blink { color: var(--cyan); animation: blink 1.1s step-end infinite; }

/* ─── Pixel Art Title ─────────────────────────────────────────────────────────── */
.pixel-title-wrap {
  max-width: 600px;
  margin-bottom: 2.25rem;
}
#pixel-title {
  display: block;
  max-width: 100%;
  height: auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

/* ─── Hero ────────────────────────────────────────────────────────────────────── */
.hero { padding: 4rem 0 3rem; position: relative; overflow: hidden; }
.hero .container { position: relative; z-index: 1; }
.hero .terminal-window { max-width: 600px; }

/* ─── Posts section ───────────────────────────────────────────────────────────── */
.posts-section { padding: 0 0 6rem; }
.section-header {
  display: flex; align-items: baseline;
  gap: 1rem; margin-bottom: 2rem;
}
.section-title {
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: .02em;
}
.section-title-prompt { color: var(--cyan); margin-right: .4rem; }
.post-content h2 .section-title-prompt,
.post-content h3 .section-title-prompt { color: var(--cyan); font-weight: 400; }
.post-count {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--text-muted);
}

/* ─── Post cards ──────────────────────────────────────────────────────────────── */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}
.post-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color var(--t), background var(--t), transform var(--t), box-shadow var(--t);
  box-shadow: var(--shadow-card);
}
.post-card:hover {
  border-color: rgba(0,212,255,.3);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-h), 0 0 0 1px rgba(0,212,255,.08);
}
.post-card-link { display: flex; flex-direction: column; height: 100%; color: inherit; }
.post-card-link:hover { color: inherit; }

.post-card-image {
  height: 180px;
  background-size: cover; background-position: center; background-repeat: no-repeat;
  flex-shrink: 0;
  position: relative;
}
.post-card-image.no-image {
  background: linear-gradient(135deg, rgba(0,212,255,.06) 0%, rgba(61,255,154,.04) 50%, rgba(192,132,252,.04) 100%);
  display: flex; align-items: center; justify-content: center;
}
.post-card-placeholder svg { color: var(--border-hover); opacity: .6; }

.post-card-content { padding: 1.25rem 1.25rem 1.5rem; flex: 1; display: flex; flex-direction: column; }
.post-card-meta {
  font-family: var(--font-mono);
  font-size: .7rem; color: var(--text-muted);
  display: flex; align-items: center; gap: .5rem;
  margin-bottom: .75rem;
}
.sep { color: var(--border-hover); }
.post-card-title {
  font-family: "Josefin Sans", var(--font-sans);
  font-size: 1rem; font-weight: 600; line-height: 1.4;
  color: var(--text);
  margin-bottom: .625rem;
  transition: color var(--t);
}
.post-card:hover .post-card-title { color: var(--cyan); }
.post-card-excerpt {
  font-size: .85rem; color: var(--text-secondary); line-height: 1.6;
  flex: 1; margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card-tags { display: flex; flex-wrap: wrap; gap: .375rem; }

/* ─── Tags ────────────────────────────────────────────────────────────────────── */
.tag {
  font-family: var(--font-mono);
  font-size: .65rem;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,255,.2);
  padding: .2em .55em;
  border-radius: 4px;
  white-space: nowrap;
}

/* ─── Commit hash badge ────────────────────────────────────────────────────────── */
.commit-hash {
  font-family: var(--font-mono);
  font-size: .65rem;
  color: var(--green);
  background: var(--green-dim);
  border: 1px solid rgba(61, 255, 154, 0.2);
  padding: .18em .45em;
  border-radius: 4px;
  letter-spacing: .04em;
  white-space: nowrap;
}

/* ─── Post layout ─────────────────────────────────────────────────────────────── */
.post-layout { padding-bottom: 6rem; }

.post-hero {
  width: 100%; height: 340px;
  background-size: cover; background-position: center;
  position: relative;
}
.post-hero::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, transparent 40%, var(--bg) 100%);
}

.post-container {
  max-width: var(--max-w-post);
  margin: 0 auto;
  padding: 3rem 1.5rem 0;
}

.post-header { margin-bottom: 2.5rem; }
.post-meta {
  font-family: var(--font-mono);
  font-size: .72rem; color: var(--text-muted);
  display: flex; align-items: center; gap: .5rem;
  margin-bottom: .875rem;
}
.post-title {
  font-family: "Josefin Sans", var(--font-sans);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700; line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--text);
  margin-bottom: 1.25rem;
}
.post-tags { display: flex; flex-wrap: wrap; gap: .4rem; }

/* ─── Post content ────────────────────────────────────────────────────────────── */
.post-content {
  font-size: 1.0625rem;
  line-height: 1.82;
  color: var(--text);
}
.post-content > * + * { margin-top: 1.25rem; }

.post-content h2 {
  font-size: 1.45rem; font-weight: 700;
  margin-top: 3rem; margin-bottom: 1rem;
  color: var(--text);
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}
.post-content h3 {
  font-size: 1.2rem; font-weight: 600;
  margin-top: 2.25rem; margin-bottom: .75rem;
  color: var(--text);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}
.post-content h4 { font-size: 1rem; font-weight: 600; margin-top: 2rem; }
.post-content p  { margin-bottom: 0; }

.post-content ul,
.post-content ol  { padding-left: 1.5rem; }
.post-content li  { margin-bottom: .375rem; }
.post-content li::marker { color: var(--cyan); }

.post-content strong { color: var(--text); font-weight: 600; }

/* links */
.post-content a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(0,212,255,.25);
  transition: border-color var(--t), color var(--t);
}
.post-content a:hover { border-color: var(--cyan); color: #66e3ff; }

/* blockquote */
.post-content blockquote {
  border-left: 3px solid var(--green);
  padding: .875rem 1.25rem;
  margin: 2rem 0;
  background: var(--green-dim);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
  font-style: italic;
}
.post-content blockquote p { margin: 0; }
.post-content blockquote + blockquote { margin-top: .5rem; }

/* inline code */
.post-content :not(pre) > code {
  font-family: var(--font-mono);
  font-size: .875em;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,255,.2);
  padding: .15em .4em;
  border-radius: 4px;
}

/* code blocks */
.post-content pre {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 2rem 0;
  line-height: 1.65;
  font-size: .875rem;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04);
}
.post-content pre::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--green), var(--purple));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  opacity: .6;
}
.post-content pre code {
  font-family: var(--font-mono);
  font-size: inherit;
  background: none; border: none; padding: 0;
}

/* copy button */
.copy-btn {
  position: absolute; top: .75rem; right: .75rem;
  font-family: var(--font-mono); font-size: .65rem;
  color: var(--text-muted);
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border-mid);
  border-radius: 5px;
  padding: .25em .6em;
  cursor: pointer;
  opacity: 0;
  transition: all var(--t);
}
.post-content pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover  { color: var(--text); border-color: var(--border-hover); }
.copy-btn.copied { color: var(--green); border-color: rgba(61,255,154,.4); }

/* images */
.post-content figure { margin: 2rem 0; text-align: center; }
.post-content figure img { border-radius: var(--radius); margin: 0 auto; border: 1px solid var(--border); }
.post-content figcaption { font-size: .8rem; color: var(--text-muted); margin-top: .5rem; font-style: italic; }
.post-content p > img { border-radius: var(--radius); margin: 0 auto; border: 1px solid var(--border); }

/* hr */
.post-content hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* table */
.post-content table { width: 100%; border-collapse: collapse; font-size: .9rem; margin: 1.5rem 0; }
.post-content th {
  background: var(--bg-surface); padding: .75rem 1rem; text-align: left;
  font-weight: 600; border: 1px solid var(--border-mid);
  font-family: var(--font-mono); font-size: .78rem; color: var(--cyan);
}
.post-content td { padding: .625rem 1rem; border: 1px solid var(--border); vertical-align: top; }
.post-content td:first-child { white-space: nowrap; }
.post-content tr:nth-child(even) td { background: rgba(255,255,255,.02); }

/* ─── Post footer ─────────────────────────────────────────────────────────────── */
.post-footer {
  margin-top: 3rem; padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex; align-items: center; gap: .75rem; flex-wrap: wrap;
}
.footer-tags-label { font-family: var(--font-mono); font-size: .72rem; color: var(--text-muted); }


/* ─── Comments Section ────────────────────────────────────────────────────────── */
.comments-section {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.comments-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.comments-title {
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: .02em;
}
.comments-title-prompt { color: var(--cyan); margin-right: .4rem; }
.comments-note {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--text-muted);
}
/* let Giscus iframe inherit background */
.giscus, .giscus-frame { width: 100%; }


/* ─── Post navigation ─────────────────────────────────────────────────────────── */
.post-navigation { margin-top: 3rem; border-top: 1px solid var(--border); padding-top: 2rem; }
.post-navigation .container { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

.post-nav-link {
  display: flex; flex-direction: column; gap: .25rem;
  max-width: 46%;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  transition: all var(--t);
}
.post-nav-link:hover { border-color: rgba(0,212,255,.3); color: var(--text); transform: translateY(-2px); }
.post-nav-link.next  { align-items: flex-end; text-align: right; }
.nav-arrow  { font-size: 1.1rem; color: var(--cyan); }
.nav-label  { font-family: var(--font-mono); font-size: .65rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; }
.nav-title  { font-size: .875rem; font-weight: 500; color: var(--text-secondary); line-height: 1.4; }

/* ─── Static page ─────────────────────────────────────────────────────────────── */
.page-layout { padding-bottom: 6rem; }
.page-layout .post-container { padding-top: 3rem; }

.page-cmd-title .cursor-blink {
  font-size: 0.7em;
  display: inline-block;
  transform: scaleX(0.45);
  transform-origin: left center;
  margin-left: 0.35em;
  position: relative;
  top: -4px;
}
.page-cmd-title .t-prompt,
.post-content h2 .t-prompt,
.post-content h3 .t-prompt { color: var(--green); margin-right: .4rem; }

.page-cmd-title .t-cmd,
.post-content h2 .t-cmd,
.post-content h3 .t-cmd {
  font-family: var(--font-mono);
  color: var(--text);
  font-weight: 600;
}

/* ─── About avatar ────────────────────────────────────────────────────────────── */
.about-avatar {
  display: block;
  width: 140px;
  height: 140px;
  margin: 0 auto 2rem;
  border-radius: 50%;
  border: 2px solid rgba(0, 212, 255, 0.4);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.08), 0 0 28px var(--cyan-glow);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  object-fit: cover;
}

/* ─── 404 ─────────────────────────────────────────────────────────────────────── */
.not-found {
  min-height: calc(100vh - var(--header-h) - 80px);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 4rem 0;
}
.not-found .terminal-window { max-width: 540px; margin-bottom: 2rem; }
.btn-home {
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--cyan);
  border: 1px solid rgba(0,212,255,.3);
  padding: .625rem 1.25rem;
  border-radius: var(--radius);
  background: var(--cyan-dim);
  transition: all var(--t);
}
.btn-home:hover { background: rgba(0,212,255,.2); border-color: var(--cyan); color: var(--cyan); }

/* ─── Footer ──────────────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  background: var(--bg-surface);
}
.footer-inner {
  display: flex; align-items: center;
  justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.footer-copy { font-family: var(--font-mono); font-size: .72rem; color: var(--text-muted); }
.footer-copy a { color: var(--text-secondary); border-bottom: 1px solid var(--border); }
.footer-copy a:hover { color: var(--cyan); border-color: var(--cyan); }
.footer-social { display: flex; gap: 1rem; }
.footer-social a { color: var(--text-muted); display: flex; transition: color var(--t); }
.footer-social a:hover { color: var(--cyan); }

/* ─── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .site-header { position: relative; }

  .site-nav {
    display: none;
    position: absolute; top: var(--header-h); left: 0; right: 0;
    flex-direction: column;
    background: rgba(9,9,15,.97);
    border-bottom: 1px solid var(--border);
    padding: .75rem 1rem;
    gap: .2rem;
    z-index: 99;
  }
  .site-nav.open { display: flex; }
  .nav-link { width: 100%; text-align: center; }
  .nav-toggle { display: flex; }

  .hero { padding: 2.5rem 0 2rem; }
  .posts-grid { grid-template-columns: 1fr; }
  .post-navigation .container { flex-direction: column; }
  .post-nav-link { max-width: 100%; }
  .post-nav-link.next { align-items: flex-start; text-align: left; }
  .footer-inner { justify-content: center; text-align: center; }
}

@media (max-width: 480px) {
  .post-hero  { height: 200px; }
  .post-container { padding: 2rem 1rem 0; }
  .terminal-body { padding: 1rem; font-size: .8rem; }
}

/* ─── Highlight.js overrides ──────────────────────────────────────────────────── */
.hljs {
  background: transparent !important;
  padding: 0 !important;
}