/* ============================================================
   Tokens
   ============================================================ */
:root {
  --bg: #edf0f2;
  --panel: #f8fafb;
  --ink: #16212b;
  --muted: #55636f;
  --line: #cbd3da;
  --link: #0b5a66;
  --marker: #f2b600;
  --code-bg: #101820;

  --t-dfir: #2558bd;
  --t-hunt: #0b6e72;
  --t-cti: #7447c9;
  --t-ctf: #8f5206;

  --sans: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f161c;
    --panel: #16202a;
    --ink: #e6ecf0;
    --muted: #9aa8b4;
    --line: #27333d;
    --link: #6cc3cf;
    --code-bg: #0a1016;

    --t-dfir: #6c9bff;
    --t-hunt: #3ec1c6;
    --t-cti: #a98bf0;
    --t-ctf: #e0a040;
  }
}

[data-tag="DFIR"] { --c: var(--t-dfir); }
[data-tag="Threat Hunting"] { --c: var(--t-hunt); }
[data-tag="CTI"] { --c: var(--t-cti); }
[data-tag="CTF"] { --c: var(--t-ctf); }

/* ============================================================
   Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
}
main { flex: 1; }
a { color: var(--link); }
:focus-visible { outline: 3px solid var(--link); outline-offset: 2px; border-radius: 2px; }

.wrap { width: 100%; max-width: 64rem; margin-inline: auto; padding-inline: 1.25rem; }

.skip-link {
  position: absolute; left: .75rem; top: -4rem;
  background: var(--ink); color: var(--bg);
  padding: .5rem .85rem; z-index: 10; font-family: var(--sans); font-weight: 600;
}
.skip-link:focus { top: .75rem; }

.swatch { display: inline-block; width: .6rem; height: .6rem; background: var(--c, var(--muted)); flex: none; }

/* ============================================================
   Header and footer
   ============================================================ */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: .5rem 1.5rem; padding-block: 1rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .6rem;
  font: 800 1.3rem/1 var(--sans); font-stretch: 80%; letter-spacing: -.01em;
  color: var(--ink); text-decoration: none;
}
.brand::before { content: ""; width: .7rem; height: .7rem; background: var(--marker); flex: none; }

.site-header nav { display: flex; flex-wrap: wrap; gap: .25rem 1.4rem; }
.site-header nav a {
  font: 600 .95rem/1.2 var(--sans); color: var(--ink); text-decoration: none;
  padding: .4rem 0; border-bottom: 3px solid transparent;
}
.site-header nav a:hover { border-bottom-color: var(--line); }
.site-header nav a[aria-current="page"] { border-bottom-color: var(--marker); }

.site-footer { border-top: 1px solid var(--line); margin-top: 4rem; color: var(--muted); font-size: .95rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 1.5rem; padding-block: 1.5rem; }
.footer-links { display: flex; gap: 1.1rem; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--ink); }

/* ============================================================
   Home: hero, filters, timeline
   ============================================================ */
.hero { padding-block: clamp(2.5rem, 7vw, 4.5rem) 1.75rem; }
.hero h1 {
  margin: 0 0 1rem;
  font: 800 clamp(2.4rem, 7vw, 4.4rem)/.98 var(--sans);
  font-stretch: 78%; letter-spacing: -.02em; max-width: 14ch;
}
.hero p { margin: 0; max-width: 46ch; font-size: 1.2rem; color: var(--muted); }

.controls { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; margin-bottom: 1.5rem; }
.chip {
  display: inline-flex; align-items: center; gap: .5rem;
  font: 600 .9rem/1 var(--sans); color: var(--ink);
  background: var(--panel); border: 1px solid var(--line); border-radius: 4px;
  padding: .55rem .8rem; cursor: pointer;
}
.chip:hover { border-color: var(--muted); }
.chip .count { color: var(--muted); font-weight: 500; }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.chip[aria-pressed="true"] .count { color: inherit; opacity: .7; }

.search {
  margin-left: auto; min-width: 12rem; flex: 0 1 16rem;
  font: 500 .95rem/1 var(--sans); color: var(--ink);
  background: var(--panel); border: 1px solid var(--line); border-radius: 4px;
  padding: .6rem .8rem;
}
.search::placeholder { color: var(--muted); }

.timeline { list-style: none; margin: 0; padding: 0; }
.entry {
  display: grid;
  grid-template-columns: 7rem 1.5rem minmax(0, 1fr);
  grid-template-areas: "date rail body";
  column-gap: 1.25rem;
}
.entry .date {
  grid-area: date; text-align: right; padding-top: 1.55rem;
  font: 500 .85rem/1.4 var(--mono); color: var(--muted); font-variant-numeric: tabular-nums;
}
.entry .rail { grid-area: rail; position: relative; }
.entry .rail::before {
  content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px;
  background: var(--line); transform: translateX(-50%);
}
.entry:first-child .rail::before { top: 1.95rem; }
.entry:last-child .rail::before { bottom: auto; height: 1.95rem; }
.entry:only-child .rail::before { display: none; }
.entry .rail::after {
  content: ""; position: absolute; left: 50%; top: 1.7rem;
  width: .8rem; height: .8rem; background: var(--marker); transform: translateX(-50%);
  box-shadow: 0 0 0 4px var(--bg);
}
.entry .body { grid-area: body; padding: 1.2rem 0 1.6rem; }
.entry h2 { margin: 0 0 .35rem; font: 700 1.45rem/1.2 var(--sans); letter-spacing: -.005em; }
.entry h2 a { color: var(--ink); text-decoration: none; }
.entry h2 a:hover { text-decoration: underline; text-decoration-color: var(--marker); text-decoration-thickness: 3px; text-underline-offset: 4px; }
.entry p { margin: 0 0 .7rem; max-width: 62ch; color: var(--muted); }

.tags { display: flex; flex-wrap: wrap; gap: .4rem 1rem; margin: 0; padding: 0; list-style: none; }
.tags li { display: inline-flex; align-items: center; gap: .4rem; font: 600 .85rem/1 var(--sans); color: var(--ink); }

.empty { padding: 2rem 0; color: var(--muted); }

@media (max-width: 40rem) {
  .entry {
    grid-template-columns: 1.5rem minmax(0, 1fr);
    grid-template-areas: "rail date" "rail body";
    column-gap: .75rem;
  }
  .entry .date { text-align: left; padding-top: 1.1rem; }
  .entry .rail::after { top: 1.25rem; }
  .entry:first-child .rail::before { top: 1.5rem; }
  .entry:last-child .rail::before { height: 1.5rem; }
  .entry .body { padding-top: .1rem; }
  .search { margin-left: 0; flex-basis: 100%; }
}

/* ============================================================
   Post page
   ============================================================ */
.post { padding-block: 2.5rem 1rem; max-width: 44rem; }
.back { font: 600 .95rem/1 var(--sans); text-decoration: none; display: inline-block; margin-bottom: 1.75rem; }
.back:hover { text-decoration: underline; }
.post-head h1 {
  margin: 0 0 .9rem; font: 800 clamp(2rem, 5vw, 3rem)/1.05 var(--sans);
  font-stretch: 85%; letter-spacing: -.015em;
}
.post-meta { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; align-items: center; color: var(--muted); margin-bottom: 2.25rem; }
.post-meta time { font: 500 .85rem/1 var(--mono); }

.prose { font-size: 1.125rem; line-height: 1.72; }
.prose > * + * { margin-top: 1.1em; }
.prose h2, .prose h3, .prose h4 { font-family: var(--sans); line-height: 1.2; letter-spacing: -.005em; margin-top: 2.2em; }
.prose h2 { font-size: 1.7rem; font-weight: 750; }
.prose h3 { font-size: 1.3rem; font-weight: 700; }
.prose h4 { font-size: 1.1rem; font-weight: 700; }
.prose h2 + *, .prose h3 + * { margin-top: .6em; }
.prose img { max-width: 100%; height: auto; border: 1px solid var(--line); }
.prose blockquote { margin-inline: 0; padding: .1rem 0 .1rem 1.1rem; border-left: 4px solid var(--marker); color: var(--muted); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin-block: 2.2rem; }
.prose li + li { margin-top: .3em; }
.prose :not(pre) > code {
  font: 500 .85em var(--mono); background: var(--panel); border: 1px solid var(--line);
  padding: .1em .35em; border-radius: 3px; overflow-wrap: anywhere;
}
.prose pre {
  position: relative; margin-inline: 0; background: var(--code-bg); color: #e6edf3;
  border-radius: 4px; overflow-x: auto; font: 400 .88rem/1.6 var(--mono);
}
.prose pre code { display: block; padding: 1.1rem 1.2rem; background: transparent !important; font: inherit; }
.copy-btn {
  position: absolute; top: .5rem; right: .5rem;
  font: 600 .75rem/1 var(--sans); color: #c9d4de; background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18); border-radius: 3px; padding: .4rem .6rem; cursor: pointer;
}
.copy-btn:hover { background: rgba(255,255,255,.16); }
.table-wrap { overflow-x: auto; }
.prose table { border-collapse: collapse; font: 400 .95rem/1.5 var(--sans); min-width: 100%; }
.prose th, .prose td { border: 1px solid var(--line); padding: .5rem .75rem; text-align: left; vertical-align: top; }
.prose th { background: var(--panel); }

/* ============================================================
   Challenges page
   ============================================================ */
.page-head { padding-block: clamp(2rem, 6vw, 3.5rem) 1.5rem; }
.page-head h1 {
  margin: 0 0 .8rem; font: 800 clamp(2.2rem, 6vw, 3.6rem)/1 var(--sans);
  font-stretch: 80%; letter-spacing: -.02em;
}
.page-head p { margin: 0; max-width: 52ch; color: var(--muted); font-size: 1.15rem; }
.page-head code { font: 500 .85em var(--mono); background: var(--panel); border: 1px solid var(--line); padding: .1em .35em; border-radius: 3px; }

.score { font: 600 .95rem/1 var(--sans); color: var(--muted); margin: 0 0 1rem; }

.challenges { border-top: 1px solid var(--line); }
.challenge { border-bottom: 1px solid var(--line); }
.challenge summary {
  list-style: none; cursor: pointer;
  display: grid; grid-template-columns: 1.25rem minmax(0, 1fr) auto auto;
  gap: .5rem 1.25rem; align-items: baseline; padding: 1.1rem 0;
}
.challenge summary::-webkit-details-marker { display: none; }
.challenge summary::before {
  content: ""; width: .5rem; height: .5rem; align-self: center;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg); transition: transform .15s ease;
}
.challenge[open] summary::before { transform: rotate(45deg); }
.challenge .c-title { font: 700 1.2rem/1.2 var(--sans); }
.challenge .c-meta { font: 500 .9rem/1 var(--sans); color: var(--muted); }
.challenge .c-points { font: 600 .85rem/1 var(--mono); }
.solved-badge {
  display: inline-block; margin-left: .6rem; font: 700 .75rem/1 var(--sans);
  background: var(--marker); color: #1b1500; padding: .25rem .45rem; border-radius: 3px; vertical-align: middle;
}
.c-body { padding: 0 0 1.5rem 2.5rem; max-width: 46rem; }
.c-body p { margin: 0 0 1rem; }
.c-files { margin: 0 0 1.1rem; padding-left: 1.2rem; font-family: var(--sans); font-size: .95rem; }
.flag-form { display: flex; flex-wrap: wrap; gap: .6rem; }
.flag-form input {
  flex: 1 1 14rem; font: 500 .9rem/1 var(--mono); color: var(--ink);
  background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: .7rem .8rem;
}
.btn {
  font: 700 .95rem/1 var(--sans); color: var(--bg); background: var(--ink);
  border: 0; border-radius: 4px; padding: .7rem 1.1rem; cursor: pointer;
}
.btn:hover { background: var(--link); }
.flag-msg { flex-basis: 100%; margin: 0; min-height: 1.4em; font: 600 .95rem/1.4 var(--sans); }
.flag-msg.ok { color: var(--t-hunt); }
.flag-msg.bad { color: var(--muted); }

@media (max-width: 40rem) {
  .challenge summary { grid-template-columns: 1.25rem minmax(0, 1fr); }
  .challenge .c-meta, .challenge .c-points { grid-column: 2; }
  .c-body { padding-left: 0; }
}

/* ============================================================
   About
   ============================================================ */
.about { max-width: 40rem; padding-bottom: 1rem; }
.about h2 { font: 700 1.5rem/1.2 var(--sans); margin: 2rem 0 .5rem; }
.about p, .about li { font-size: 1.125rem; }