/* ============================================================
   playing with — terminal theme · Tokyo Night palette
   Hacker/terminal vibe, low eye-strain, easy to read.
   ============================================================ */
:root {
  --bg:        #1a1b26;  /* night */
  --bg-2:      #1f2335;
  --panel:     #1e2030;
  --panel-2:   #24283b;
  --border:    #2a2e42;
  --border-2:  #3b4261;

  --accent:    #7aa2f7;  /* blue   — links, brand, headings */
  --accent-2:  #bb9af7;  /* violet — secondary accents */
  --cyan:      #7dcfff;  /* cyan   — hover, tags */
  --teal:      #73daca;
  --prompt:    #9ece6a;  /* green  — shell prompt (iconic) */
  --code:      #e0af68;  /* amber  — inline code */
  --pink:      #f7768e;  /* red/pink — errors, em */

  --text:      #a9b1d6;  /* soft blue-grey body text */
  --muted:     #565f89;  /* comments / meta */
  --white:     #c0caf5;  /* headings / emphasis */

  --mono: "JetBrains Mono", "Fira Code", "Cascadia Code", "SFMono-Regular",
          ui-monospace, Menlo, Consolas, "DejaVu Sans Mono", monospace;
  --glow: 0 0 12px rgba(122, 162, 247, 0.25);   /* soft, not neon */
  --maxw: 860px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .2px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* faint background grid */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(122, 162, 247, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(122, 162, 247, .035) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 40%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* ---------- ambient aurora background (replaces matrix rain) ---------- */
.aurora {
  position: fixed;
  inset: -20vh -10vw;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  filter: blur(70px);
  opacity: .55;
}
.aurora span {
  position: absolute;
  display: block;
  width: 45vw;
  height: 45vw;
  border-radius: 50%;
  mix-blend-mode: screen;
  will-change: transform;
}
.aurora span:nth-child(1) {
  background: radial-gradient(circle, rgba(122,162,247,.45), transparent 65%);
  top: -10%; left: -5%;
  animation: drift1 26s ease-in-out infinite alternate;
}
.aurora span:nth-child(2) {
  background: radial-gradient(circle, rgba(187,154,247,.38), transparent 65%);
  top: 20%; right: -10%;
  animation: drift2 32s ease-in-out infinite alternate;
}
.aurora span:nth-child(3) {
  background: radial-gradient(circle, rgba(125,207,255,.30), transparent 65%);
  bottom: -15%; left: 25%;
  animation: drift3 38s ease-in-out infinite alternate;
}
@keyframes drift1 { from { transform: translate(0,0) scale(1); } to { transform: translate(12vw,10vh) scale(1.25); } }
@keyframes drift2 { from { transform: translate(0,0) scale(1.1); } to { transform: translate(-14vw,6vh) scale(.9); } }
@keyframes drift3 { from { transform: translate(0,0) scale(1); } to { transform: translate(8vw,-12vh) scale(1.2); } }

.wrap {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--cyan); }

::selection { background: rgba(122, 162, 247, .35); color: var(--white); }

/* ---------- header ---------- */
.site-header {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(180deg, var(--panel), rgba(30, 32, 48, .35));
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  position: relative;
  backdrop-filter: blur(6px);
}
.site-header::before {
  content: "● ● ●";
  position: absolute;
  top: .7rem;
  right: .9rem;
  color: var(--border-2);
  font-size: .65rem;
  letter-spacing: .3rem;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: .2rem .6ch;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--white);
  max-width: 100%;
}
.brand:hover { color: var(--white); }
.prompt { color: var(--prompt); font-weight: 700; }
.brand-name { color: var(--accent); }
.cursor { color: var(--cyan); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.tagline { color: var(--muted); margin: .35rem 0 1rem; font-style: italic; }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem 1.25rem;
  border-top: 1px dashed var(--border);
  padding-top: .75rem;
}
.nav a { color: var(--text); }
.nav a::before { content: "["; color: var(--border-2); }
.nav a::after { content: "]"; color: var(--border-2); }
.nav a:hover, .nav a.active { color: var(--accent); }

/* ---------- hero ---------- */
.hero { margin-bottom: 2.5rem; }
.ascii {
  color: var(--accent);
  text-shadow: var(--glow);
  font-size: clamp(1.4rem, 6vw, 2.6rem);
  font-weight: 700;
  letter-spacing: .4ch;
  margin: 0 0 1rem;
  text-transform: lowercase;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-line { color: var(--prompt); margin: .25rem 0; }
.hero-desc { color: var(--text); max-width: 62ch; }

/* ---------- section titles ---------- */
.section-title {
  color: var(--accent);
  font-size: 1.15rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: .5rem;
  margin: 0 0 1.5rem;
}
.section-title .count { color: var(--muted); font-weight: 400; }

/* ---------- post list / cards ---------- */
.post-card {
  border: 1px solid var(--border);
  border-left: 3px solid var(--border-2);
  border-radius: 8px;
  background: rgba(30, 32, 48, .45);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  transition: border-color .18s, transform .18s, box-shadow .18s, background .18s;
  backdrop-filter: blur(4px);
}
.post-card:hover {
  border-left-color: var(--accent);
  background: rgba(36, 40, 59, .6);
  box-shadow: -4px 0 22px -10px rgba(122, 162, 247, .6);
  transform: translateX(3px);
}
.post-card-meta {
  display: flex;
  gap: 1rem;
  color: var(--muted);
  font-size: .8rem;
  margin-bottom: .35rem;
}
.post-card-meta .date::before { content: "> "; color: var(--prompt); }
.post-card-title { margin: 0 0 .4rem; font-size: 1.25rem; line-height: 1.3; }
.post-card-title a { color: var(--white); }
.post-card-title a:hover { color: var(--accent); }
.post-card-excerpt { color: var(--text); margin: 0 0 .75rem; font-size: .95rem; }

/* ---------- tags ---------- */
.tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.tag {
  font-size: .75rem;
  color: var(--cyan);
  border: 1px solid var(--border-2);
  padding: .05rem .5rem;
  border-radius: 999px;
  background: rgba(125, 207, 255, .06);
  transition: border-color .15s, background .15s, color .15s;
}
.tag:hover { border-color: var(--cyan); color: var(--white); background: rgba(125, 207, 255, .12); }

/* ---------- single post ---------- */
.post-header { margin-bottom: 2rem; }
.post-meta { color: var(--prompt); font-size: .85rem; margin-bottom: .75rem; }
.post-title {
  color: var(--white);
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  line-height: 1.2;
  margin: 0 0 .5rem;
}
.post-subhead { display: flex; gap: 1rem; color: var(--muted); font-size: .85rem; margin-bottom: .75rem; }

.post-body { font-size: 1rem; }
.post-body h1, .post-body h2, .post-body h3, .post-body h4 {
  color: var(--accent);
  margin: 2rem 0 .8rem;
  line-height: 1.3;
}
.post-body h2 { color: var(--accent); }
.post-body h3 { color: var(--accent-2); }
.post-body h2::before { content: "## "; color: var(--muted); }
.post-body h3::before { content: "### "; color: var(--muted); }
.post-body p { margin: 0 0 1.1rem; }
.post-body a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--border-2); }
.post-body a:hover { text-decoration-color: var(--cyan); }
.post-body ul, .post-body ol { margin: 0 0 1.1rem; padding-left: 1.5rem; }
.post-body li { margin: .3rem 0; }
.post-body ul li::marker { content: "» "; color: var(--accent-2); }
.post-body blockquote {
  border-left: 3px solid var(--accent-2);
  margin: 1.2rem 0;
  padding: .3rem 1rem;
  color: var(--muted);
  background: rgba(187, 154, 247, .06);
  border-radius: 0 6px 6px 0;
  font-style: italic;
}
.post-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.5rem auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 30px -12px rgba(0, 0, 0, .8);
}
.post-body hr { border: none; border-top: 1px dashed var(--border-2); margin: 2rem 0; }
.post-body strong { color: var(--white); }
.post-body em { color: var(--code); font-style: normal; }

/* code */
.post-body code {
  font-family: var(--mono);
  background: var(--panel-2);
  color: var(--code);
  padding: .1rem .4rem;
  border-radius: 4px;
  font-size: .9em;
  border: 1px solid var(--border);
}
.post-body pre {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  margin: 1.4rem 0;
}
.post-body pre::before { content: "$ "; color: var(--prompt); }
.post-body pre code {
  background: none;
  border: none;
  color: var(--text);
  padding: 0;
  font-size: .85rem;
  line-height: 1.6;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4rem 0;
  font-size: .9rem;
  display: block;
  overflow-x: auto;
}
.post-body th, .post-body td { border: 1px solid var(--border); padding: .5rem .75rem; text-align: left; }
.post-body th { color: var(--accent); background: rgba(122, 162, 247, .08); }

.post-footer { margin-top: 3rem; border-top: 1px dashed var(--border); padding-top: 1rem; }
.back { color: var(--prompt); }

/* ---------- contact form ---------- */
.contact-form { display: flex; flex-direction: column; gap: 1rem; margin-top: 1.5rem; }
.contact-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }  /* honeypot */
.contact-form label { display: flex; flex-direction: column; gap: .35rem; color: var(--prompt); font-size: .85rem; }
.contact-form input, .contact-form textarea {
  font-family: var(--mono);
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  color: var(--text);
  padding: .6rem .75rem;
  border-radius: 6px;
  font-size: .95rem;
}
.contact-form input::placeholder, .search-box input::placeholder { color: var(--muted); }
.contact-form input:focus, .contact-form textarea:focus,
.search-box input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--glow);
}
.contact-form button, .search-box button {
  font-family: var(--mono);
  background: rgba(122, 162, 247, .1);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: .6rem 1.1rem;
  border-radius: 6px;
  cursor: pointer;
  align-self: flex-start;
  transition: background .15s, color .15s;
}
.contact-form button:hover { background: var(--accent); color: var(--bg); }
.contact-form button:disabled { opacity: .5; cursor: not-allowed; }
.form-note { color: var(--muted); font-size: .8rem; }

/* ---------- post floating side rail ---------- */
.sidebar { position: fixed; left: 1rem; top: 50%; transform: translateY(-50%); z-index: 40; }

.rail {
  display: flex; flex-direction: column; gap: .2rem;
  padding: .4rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(30, 32, 48, .55);
  backdrop-filter: blur(8px);
}
.rail-btn {
  position: relative;
  display: flex; align-items: center; justify-content: center;
  width: 42px; height: 42px;
  border: 1px solid transparent; border-radius: 10px;
  background: none; color: var(--text); cursor: pointer; text-decoration: none;
}
.rail-btn:hover { color: var(--accent); background: rgba(122, 162, 247, .12); }
.rail-btn.disabled { color: var(--border-2); cursor: default; }
.rail-btn.disabled:hover { background: none; color: var(--border-2); }
.rail-ico svg { width: 20px; height: 20px; display: block; }

/* hover label (tooltip to the right) */
.rail-label {
  position: absolute; left: calc(100% + 10px); top: 50%; transform: translateY(-50%);
  white-space: nowrap; font-size: .78rem; color: var(--text);
  background: var(--panel-2); border: 1px solid var(--border-2);
  border-radius: 6px; padding: .2rem .55rem;
  opacity: 0; pointer-events: none; transition: opacity .12s;
}
.rail-btn:hover .rail-label, .rail-btn:focus-visible .rail-label { opacity: 1; }

/* fly-out panels (toc / share) */
.rail-panel {
  position: absolute; left: calc(100% + 10px); top: 0;
  width: 250px; max-height: 74vh; overflow-y: auto;
  border: 1px solid var(--border-2); border-radius: 12px;
  background: var(--panel-2); padding: .9rem 1.05rem;
  box-shadow: 0 14px 40px -14px rgba(0, 0, 0, .75);
}
.rail-panel[hidden] { display: none; }
.side-title { color: var(--muted); margin: 0 0 .55rem; font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; }

/* toc */
.toc, .toc-child { list-style: none; margin: 0; padding: 0; }
.toc-child { margin: .1rem 0 .1rem .7rem; }
.toc-link {
  display: block; color: var(--text);
  padding: .2rem 0 .2rem .7rem; border-left: 2px solid var(--border);
  line-height: 1.4; transition: color .15s, border-color .15s;
}
.toc-link:hover { color: var(--accent); border-left-color: var(--accent); text-shadow: none; }
.toc-link.active { color: var(--accent); border-left-color: var(--accent); }
.toc-child .toc-link { font-size: .82rem; color: var(--muted); }
.toc-child .toc-link:hover, .toc-child .toc-link.active { color: var(--accent); }

/* share panel */
.share-list { display: flex; gap: .4rem; }
.share-ico {
  display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 9px;
  border: 1px solid var(--border-2); background: rgba(122, 162, 247, .05);
  color: var(--text); cursor: pointer;
}
.share-ico svg { width: 18px; height: 18px; }
.share-ico:hover { color: var(--accent); border-color: var(--accent); background: rgba(122, 162, 247, .14); }
.share-copied { color: var(--prompt); font-size: .78rem; margin: .5rem 0 0; }

/* ---- mobile: fixed bottom bar (like the original blog) ---- */
@media (max-width: 1100px) {
  .single .wrap { padding-bottom: 5rem; }          /* room for the bottom bar */
  .sidebar {
    position: fixed; left: 0; right: 0; bottom: 0; top: auto; transform: none; z-index: 60;
  }
  .rail {
    flex-direction: row; justify-content: center; gap: .35rem;
    border: none; border-top: 1px solid var(--border-2); border-radius: 0;
    background: rgba(18, 20, 30, .94); padding: .4rem;
  }
  .rail-btn { width: 44px; height: 44px; }
  .rail-label {                                     /* sr-only on the bar */
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; opacity: 0;
  }
  .rail-panel {
    position: fixed; left: .75rem; right: .75rem; bottom: 62px; top: auto;
    width: auto; max-height: 55vh;
  }
}
@media (max-width: 420px) {
  .rail-btn { width: 40px; height: 40px; }
  .rail-ico svg { width: 19px; height: 19px; }
}

/* ---------- interactive websocket demo (cracking-passwords post) ---------- */
.ws-demo {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin: 1.4rem 0;
}
.ws-demo input {
  flex: 1 1 260px;
  font-family: var(--mono);
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  color: var(--text);
  padding: .6rem .75rem;
  border-radius: 6px;
  font-size: .95rem;
}
.ws-demo input:focus { outline: none; border-color: var(--accent); box-shadow: var(--glow); }
.ws-demo input:invalid:not(:placeholder-shown) { border-color: var(--pink); }
.ws-demo button {
  font-family: var(--mono);
  background: rgba(122, 162, 247, .1);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: .6rem 1.2rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.ws-demo button:hover { background: var(--accent); color: var(--bg); }
.post-body .ws-demo #output {
  flex: 1 1 100%;
  min-height: 3.5rem;
  max-height: 320px;
  overflow-y: auto;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--teal);
  border-left: 3px solid var(--accent-2);
}
.post-body .ws-demo #output::before { content: none; }  /* no "$" prompt on live output */

/* ---------- search ---------- */
.search-box {
  display: flex;
  align-items: center;
  gap: .6ch;
  border: 1px solid var(--border-2);
  background: var(--bg-2);
  padding: .5rem .75rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}
.search-box .prompt { flex: none; }
.search-box input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--mono);
  font-size: 1rem;
}
.search-box input:focus { outline: none; }
.search-status { color: var(--muted); font-size: .85rem; margin: 0 0 1.5rem; min-height: 1.2em; }
mark { background: rgba(158, 206, 106, .3); color: var(--white); padding: 0 .15rem; border-radius: 3px; }

/* ---------- footer ---------- */
.site-footer {
  margin-top: 3rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem;
  color: var(--muted);
  font-size: .8rem;
}
.site-footer a { color: var(--accent-2); }

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  .wrap { padding: 1.25rem 1rem 3.5rem; }
  .nav { gap: .25rem .9rem; }
  .post-body { font-size: .98rem; }
}
@media (max-width: 640px) {
  body { font-size: 15px; }
  .brand { font-size: 1.05rem; }
  .prompt { word-break: break-all; }
  .wrap { padding: 1rem .85rem 3rem; }
  .site-header { padding: .85rem 1rem; }
  .site-header::before { display: none; }
  .post-card { padding: .85rem 1rem; }
  .post-subhead, .post-card-meta { flex-wrap: wrap; gap: .25rem .75rem; }
  .site-footer { flex-direction: column; gap: .35rem; }
  .contact-form button, .search-box button { align-self: stretch; text-align: center; }
  .post-body pre { padding: .8rem .7rem; }
  .post-body pre code { font-size: .78rem; }
}
@media (max-width: 380px) {
  .ascii { letter-spacing: .2ch; }
  .nav { font-size: .9rem; }
}

/* ---------- scroll reveal (only when JS is active) ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .6s ease, transform .7s cubic-bezier(.2, .7, .2, 1);
  will-change: opacity, transform;
}
.js .reveal.visible {
  opacity: 1;
  transform: none;
}

/* respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  .aurora span { animation: none; }
  .cursor { animation: none; }
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
}