/* ==========================================================
   COLOR
   ========================================================== */
:root {
  --bg:            #0a0d10;
  --bg-elevated:   #10151a;
  --bg-terminal:   #0d1216;
  --border:        #1f2933;
  --fg:            #96a4ac;
  --fg-muted:      #7b8a95;
  --fg-dim:        #4b5860;

  --purple:         #a07fd6;
  --green-dim:     #00d459;
  --blue:          #58a6ff;
  --yellow:        #ffbd2e;
  --red:           #ff5f56;

  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --radius: 0px;
  --radius-soft: 2px;
  --wrap: 1100px;
  --speed: 200ms;
}

[data-theme="light"] {
  --bg:            #f4f6f5;
  --bg-elevated:   #ffffff;
  --bg-terminal:   #0d1216;
  --border:        #d7dcdb;
  --fg:            #1b2429;
  --fg-muted:      #5a6a70;
  --fg-dim:        #8a9aa0;
  
  --purple:         #a07fd6;
  --green-dim:     #00d459;
  --blue:          #58a6ff;
  --yellow:        #ffbd2e;
  --red:           #ff5f56;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* ==========================================================
   RESET / BASE
   ========================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* faint CRT scanlines — dark theme only, decorative */
[data-theme="dark"] body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2000;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255,255,255,0.015) 0px,
    rgba(255,255,255,0.015) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: overlay;
}

h1, h2, h3 { margin: 0 0 0.5em; line-height: 1.15; font-weight: 700; }
p { margin: 0 0 1em; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 2px;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--purple);
  color: #06120a;
  padding: 10px 16px;
  z-index: 1000;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ==========================================================
   TOPBAR
   ========================================================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--purple);
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand__avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}
.brand__prompt { color: var(--fg-dim); margin-right: 6px; }
.cursor { animation: blink 1s steps(1) infinite; }

.nav {
  display: flex;
  gap: 28px;
  flex: 1;
  justify-content: center;
}
.nav a { color: var(--fg-muted); font-size: 14px; }
.nav a:hover { color: var(--fg); text-decoration: none; }
.nav a::before { content: "./"; color: var(--fg-dim); }

.topbar__actions { display: flex; align-items: center; gap: 16px; }

.clock {
  font-size: 12px;
  color: var(--fg-dim);
  letter-spacing: 0.03em;
  border: 1px solid var(--border);
  padding: 4px 8px;
  display: none;
}
@media (min-width: 640px) { .clock { display: inline-block; } }

.theme-toggle {
  width: 42px;
  height: 22px;
  border-radius: 11px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  cursor: pointer;
  position: relative;
  padding: 0;
}
.theme-toggle__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--purple);
  transition: transform var(--speed) ease;
}
[data-theme="light"] .theme-toggle__thumb { transform: translateX(20px); background: var(--yellow); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span { width: 20px; height: 2px; background: var(--fg); display: block; }

/* ==========================================================
   HERO
   ========================================================== */
.hero { padding-top: 64px; overflow: hidden; }
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  padding-bottom: 56px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--purple);
  font-size: 13px;
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}
.eyebrow__rule { width: 24px; height: 2px; background: var(--purple); display: inline-block; }

.hero__title {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  letter-spacing: -0.01em;
}
.tone-a { color: var(--fg); }
.tone-b { color: var(--purple); text-shadow: 0 0 24px color-mix(in srgb, var(--purple) 55%, transparent); }
.tone-c { color: var(--fg-muted); }

.hero__lede {
  color: var(--fg-muted);
  max-width: 46ch;
  font-size: 15px;
}

.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: var(--radius-soft);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}
.btn:hover { text-decoration: none; }
.btn--primary { background: var(--purple); color: #04160b; }
.btn--primary:hover { background: color-mix(in srgb, var(--purple) 85%, white 15%); }
.btn--ghost { border-color: var(--border); color: var(--fg); background: var(--bg-elevated); }
.btn--ghost:hover { border-color: var(--fg-muted); }

/* ---- terminal window ---- */
.terminal {
  position: relative;
  background: var(--bg-terminal);
  border: 1px solid var(--border);
  overflow: visible;
  box-shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
}
.terminal::before, .terminal::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--purple);
  opacity: 0.8;
}
.terminal::before { top: -6px; left: -6px; border-right: none; border-bottom: none; }
.terminal::after { bottom: -6px; right: -6px; border-left: none; border-top: none; }
.terminal__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: #05070a;
  border-bottom: 1px solid var(--border);
}
.dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.dot--red { background: var(--red); }
.dot--yellow { background: var(--yellow); }
.dot--green { background: var(--green-dim); }
.terminal__title { margin-left: 10px; color: var(--fg-dim); font-size: 12px; }

.terminal__body { padding: 20px; font-size: 13.5px; color: #cfe3d8; min-height: 220px; }
.terminal__body p { margin: 0 0 10px; }
.prompt { color: var(--purple); margin-right: 6px; }
.out { color: var(--fg-muted); }
.out--whoami { display: flex; align-items: center; gap: 10px; color: var(--fg); font-weight: 600; }
.whoami__avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--purple);
  box-shadow: 0 0 12px color-mix(in srgb, var(--purple) 35%, transparent);
}
.type-cursor { color: var(--purple); animation: blink 1s steps(1) infinite; }

@keyframes blink { 50% { opacity: 0; } }

/* ---- ticker ---- */
.ticker {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  overflow: hidden;
  padding: 12px 0;
}
.ticker__track {
  display: flex;
  gap: 40px;
  width: max-content;
  animation: scroll-left 26s linear infinite;
  font-size: 13px;
  color: var(--fg-muted);
  white-space: nowrap;
}
.ticker:hover .ticker__track { animation-play-state: paused; }
@keyframes scroll-left {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
.tag {
  font-style: normal;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 999px;
  margin-left: 8px;
  text-transform: lowercase;
}
.tag--easy   { background: color-mix(in srgb, var(--green-dim) 18%, transparent); color: var(--green-dim); }
.tag--medium { background: color-mix(in srgb, var(--yellow) 18%, transparent); color: var(--yellow); }
.tag--hard   { background: color-mix(in srgb, var(--red) 18%, transparent); color: var(--red); }

/* ---- stats ---- */
.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin: 40px auto 0;
  max-width: var(--wrap);
}
.stat {
  background: var(--bg-elevated);
  padding: 28px;
  text-align: center;
}
.stat__num { display: block; font-size: 28px; font-weight: 800; color: var(--purple); }
.stat__label { font-size: 12px; color: var(--fg-muted); letter-spacing: 0.05em; }

/* ==========================================================
   SECTIONS
   ========================================================== */
.section { padding: 72px 0; }
.section--alt { background: var(--bg-elevated); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.cmd { color: var(--fg); font-size: 15px; margin-bottom: 32px; }
.cmd .prompt { color: var(--purple); }

/* ---- writeups listing (ls -la style) ---- */
.listing {
  border: 1px solid var(--border);
  font-size: 13.5px;
}
.listing__head {
  display: grid;
  grid-template-columns: 120px 90px 110px 1fr 90px;
  gap: 12px;
  padding: 10px 18px;
  color: var(--fg-dim);
  font-size: 11px;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}
.listing__row {
  display: grid;
  grid-template-columns: 120px 90px 110px 1fr 90px;
  gap: 12px;
  align-items: center;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--fg);
}
.listing__row:last-child { border-bottom: none; }
.listing__row:hover { background: var(--bg-elevated); text-decoration: none; }
.listing__row:hover .name { color: var(--purple); }
.listing__row--draft { opacity: 0.6; }
.perm { color: var(--fg-dim); font-size: 12px; }
.listing .cat { color: var(--fg-muted); text-transform: uppercase; font-size: 11px; letter-spacing: 0.05em; }
.name { display: flex; flex-direction: column; gap: 4px; color: var(--fg); font-weight: 600; }
.name .ext { color: var(--fg-dim); font-weight: 400; }
.name small { color: var(--fg-muted); font-weight: 400; font-size: 12px; }
.listing time { color: var(--fg-dim); font-size: 12px; white-space: nowrap; }

/* ---- category tiles ---- */
.grid--categories { grid-template-columns: repeat(3, 1fr); }
.tile {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  padding: 16px 18px;
  color: var(--fg);
  background: var(--bg);
  font-size: 14px;
}
.tile:hover { text-decoration: none; border-color: var(--purple); }
.tile::after {
  content: "";
  position: absolute;
  top: 0; right: 0;
  width: 0; height: 0;
  border-style: solid;
  border-width: 0 14px 14px 0;
  border-color: transparent var(--border) transparent transparent;
  transition: border-color var(--speed) ease;
}
.tile:hover::after { border-color: transparent var(--purple) transparent transparent; }
.tile__glyph { color: var(--purple); font-size: 16px; }
.tile__name { flex: 1; }
.tile__count { color: var(--fg-dim); font-size: 12px; }
/* ==========================================================
   PÁGINA DE WRITEUP INDIVIDUAL
   ========================================================== */
.breadcrumb {
  padding: 24px 0 0;
  color: var(--fg-dim);
  font-size: 13px;
}
.breadcrumb a { color: var(--fg-muted); }
.breadcrumb a:hover { color: var(--purple); }

.writeup-header { padding: 20px 0 40px; }

.writeup-header__file {
  position: relative;
  border: 1px solid var(--border);
  background: var(--bg-terminal);
}
.writeup-header__file::before, .writeup-header__file::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid var(--purple);
  opacity: 0.8;
}
.writeup-header__file::before { top: -6px; left: -6px; border-right: none; border-bottom: none; }
.writeup-header__file::after { bottom: -6px; right: -6px; border-left: none; border-top: none; }

.writeup-header__bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: #05070a;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--fg-dim);
}

.writeup-header__body { padding: 26px 28px; }
.writeup-header__title { font-size: clamp(1.6rem, 3.4vw, 2.3rem); margin-bottom: 14px; }
.writeup-header__desc { color: var(--fg-muted); max-width: 62ch; margin-bottom: 20px; }

.writeup-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: 13px;
  color: var(--fg-muted);
  border-top: 1px solid var(--border);
  padding-top: 18px;
}
.writeup-meta__item { display: flex; align-items: center; gap: 6px; }
.writeup-meta__label { color: var(--fg-dim); }

/* ---- layout: contenido + índice ---- */
.writeup-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 48px;
  align-items: start;
  padding-bottom: 64px;
}

.toc {
  position: sticky;
  top: 84px;
  border: 1px solid var(--border);
  padding: 16px 18px;
  font-size: 13px;
}
.toc__title { color: var(--fg-dim); font-size: 11px; letter-spacing: 0.08em; margin-bottom: 10px; }
.toc ol { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.toc a { color: var(--fg-muted); }
.toc a:hover { color: var(--purple); }

/* ---- prosa del writeup ---- */
.prose { max-width: 74ch; font-size: 15px; }
.prose h2 {
  font-size: 1.25rem;
  margin-top: 2.2em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 84px;
}
.prose h2 .idx { color: var(--purple); margin-right: 10px; }
.prose h3 { font-size: 1.05rem; margin-top: 1.6em; scroll-margin-top: 84px; }
.prose p { color: var(--fg); }
.prose p, .prose li { color: #c4cdd3; }
[data-theme="light"] .prose p, [data-theme="light"] .prose li { color: var(--fg); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin-bottom: 6px; }
.prose strong { color: var(--fg); }
.prose a { text-decoration: underline; text-underline-offset: 3px; }

.callout {
  border-left: 3px solid var(--purple);
  background: var(--bg-elevated);
  padding: 14px 18px;
  margin: 1.6em 0;
  font-size: 14px;
  color: var(--fg-muted);
}
.callout strong { color: var(--purple); }

.codeblock { margin: 1.5em 0; border: 1px solid var(--border); background: var(--bg-terminal); }
.codeblock__label {
  display: flex;
  justify-content: space-between;
  padding: 11px 14px;
  font-size: 11px;
  color: var(--fg-dim);
  background: #05070a;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.04em;
}
.codeblock pre {
  margin: 0;
  padding: 15px 12px;
  overflow-x: auto;
  font-size: 12px;
  line-height: 1.6;
  color: #cfe3d8;
}
.codeblock code .c-important {color:var(--red)}
.codeblock code .c-prompt {color: var(--purple); }
.codeblock code .c-comment {color: var(--fg-dim); }
.codeblock code .c-out {color: var(--fg-muted); }

.writeup-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--border);
  margin-top: 48px;
  padding-top: 24px;
}
.writeup-nav a {
  color: var(--fg-muted);
  font-size: 13px;
  max-width: 45%;
}
.writeup-nav a:hover { color: var(--purple); }
.writeup-nav__dir { display: block; color: var(--fg-dim); font-size: 11px; margin-bottom: 4px; }
.writeup-nav__next { text-align: right; margin-left: auto; }

@media (max-width: 860px) {
  .writeup-layout { grid-template-columns: 1fr; }
  .toc { position: static; }
}










/* ==========================================================
   FOOTER
   ========================================================== */
.footer { padding: 56px 0 40px; }
.footer__links { display: flex; gap: 24px; margin-bottom: 18px; }
.footer__note { color: var(--fg-dim); font-size: 13px; margin: 0; }

/* ==========================================================
   RESPONSIVE
   ========================================================== */
@media (max-width: 860px) {
  .hero__grid { grid-template-columns: 1fr; }
  .grid--categories { grid-template-columns: 1fr 1fr; }
  .listing__head { display: none; }
  .listing__row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 14px 16px;
  }
  .perm { display: none; }
  .nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav-toggle { display: flex; }
}

@media (max-width: 520px) {
  .grid--categories { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  .hero__cta { flex-direction: column; align-items: flex-start; }
}