:root {
  --bg: #0b0c0e;
  --panel: #111316;
  --panel-2: #16191d;
  --line: #23272d;
  --line-2: #33383f;
  --text: #e7e9ec;
  --muted: #7c838d;
  --dim: #4a5059;
  --accent: #ff5a1f;
  --accent-soft: rgba(255, 90, 31, 0.1);
  --ok: #3ddc97;
  --warn: #ffb020;
  --bad: #ff4d5e;
  --display: "Archivo", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--mono);
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

main { flex: 1; }

a { color: inherit; }

::selection { background: var(--accent); color: var(--bg); }

:focus-visible { outline: 1px solid var(--accent); outline-offset: 3px; }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 1rem; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.label {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.acc { color: var(--accent); }

/* ---------- Navigatie ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 12, 14, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 52px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.brand-mark {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--display);
  font-weight: 900;
  font-stretch: 125%;
  font-size: 0.85rem;
}

.brand-text { overflow: hidden; text-overflow: ellipsis; }

.nav-right { display: flex; align-items: center; gap: 0.25rem; flex: none; }

.lang-toggle {
  display: flex;
  gap: 0.6ch;
  font: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--dim);
  background: none;
  border: 0;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

.lang-toggle span.on { color: var(--accent); }
.lang-toggle:hover { background: var(--panel); color: var(--muted); }
.brand .crumb { color: var(--muted); font-weight: 400; }

.back {
  flex: none;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  padding: 0.35rem 0.6rem;
}

.back:hover { color: var(--accent); background: var(--panel); }

/* ---------- Kop ---------- */
.head {
  position: relative;
  padding: 4.5rem 0 3rem;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.head::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
  opacity: 0.35;
  mask-image: linear-gradient(to bottom, #000 30%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, #000 30%, transparent);
}

.head .wrap { position: relative; }

h1 {
  font-family: var(--display);
  font-weight: 900;
  font-stretch: 125%;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 0.9;
}

.head h1 { margin-top: 1rem; font-size: clamp(2.6rem, 10vw, 6rem); }

.outline { color: transparent; -webkit-text-stroke: 1.5px var(--text); }

.lead { margin-top: 1.5rem; max-width: 56ch; color: var(--muted); font-size: 0.95rem; }

/* ---------- Telemetrie ---------- */
.hud {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.hud-inner { display: flex; overflow-x: auto; scrollbar-width: none; }
.hud-inner::-webkit-scrollbar { display: none; }

.hud-item {
  padding: 0.5rem 1rem;
  border-right: 1px solid var(--line);
  white-space: nowrap;
}

.hud-item:first-child { padding-left: 0; }
.hud-item b { color: var(--text); font-weight: 500; }

/* ---------- Lijst ---------- */
.listing { padding-top: 2.5rem; padding-bottom: 5rem; }

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.filters { display: flex; flex-wrap: wrap; }

.filter {
  font: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line);
  margin: 0 -1px -1px 0;
  padding: 0.5rem 0.85rem;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

.filter span { color: var(--dim); margin-left: 0.5ch; }
.filter:hover { color: var(--text); background: var(--panel); }
.filter[aria-pressed="true"] { color: var(--bg); background: var(--accent); border-color: var(--accent); position: relative; }
.filter[aria-pressed="true"] span { color: var(--bg); opacity: 0.7; }

.search {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: min(100%, 300px);
  padding: 0 0.8rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--accent);
}

.search:focus-within { border-color: var(--accent); }

.search input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 0.8rem;
  color: var(--text);
  background: none;
  border: 0;
  padding: 0.6rem 0;
  outline: none;
}

.posts { list-style: none; border-top: 1px solid var(--line); }

.post-row {
  position: relative;
  display: grid;
  grid-template-columns: 4ch 1fr auto;
  gap: 0.4rem 1.5rem;
  align-items: baseline;
  padding: 1.4rem 0.75rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background 0.15s;
}

.post-row::after {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  height: 2px;
  width: 0;
  background: var(--accent);
  transition: width 0.35s ease;
}

.post-row:hover { background: var(--panel); }
.post-row:hover::after, .post-row:focus-visible::after { width: 100%; }

.post-row .idx { color: var(--dim); font-size: 0.8rem; }

.post-row h2 {
  font-family: var(--display);
  font-weight: 800;
  font-stretch: 125%;
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  line-height: 1.1;
  text-transform: uppercase;
}

.post-row h2 .arrow { color: var(--accent); display: inline-block; transition: transform 0.25s; }
.post-row:hover h2 .arrow { transform: translate(4px, -4px); }

.post-row .date { color: var(--muted); font-size: 0.75rem; white-space: nowrap; }
.post-row .summary { grid-column: 2 / -1; color: var(--muted); max-width: 70ch; }
.post-row .chips { grid-column: 2 / -1; }

@media (max-width: 640px) {
  .post-row { grid-template-columns: 3ch 1fr; }
  .post-row .date { grid-column: 2; grid-row: 1; }
  .post-row h2 { grid-column: 2; }
  .post-row .idx { grid-row: 1 / 3; }
}

.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.3rem; }

.chip {
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--line-2);
  color: var(--muted);
}

.chip.cat { color: var(--accent); border-color: rgba(255, 90, 31, 0.45); }
.chip.easy { color: var(--ok); border-color: rgba(61, 220, 151, 0.4); }
.chip.medium { color: var(--warn); border-color: rgba(255, 176, 32, 0.4); }
.chip.hard { color: var(--bad); border-color: rgba(255, 77, 94, 0.4); }
.chip.insane { color: var(--bg); background: var(--bad); border-color: var(--bad); }
.chip.tag { text-transform: none; letter-spacing: 0; }
.chip.tag::before { content: "#"; color: var(--dim); }

.empty {
  position: relative;
  margin-top: 1.5rem;
  padding: 2.5rem 1.5rem;
  border: 1px dashed var(--line-2);
  background: repeating-linear-gradient(135deg, transparent 0 10px, rgba(255, 255, 255, 0.015) 10px 20px);
  color: var(--muted);
}

.empty strong {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--display);
  font-stretch: 125%;
  font-weight: 800;
  font-size: 1.2rem;
  text-transform: uppercase;
  color: var(--text);
}

/* ---------- Write-up ---------- */
.post-head { padding: 3rem 0 2.5rem; border-bottom: 1px solid var(--line); }

.back-link { text-decoration: none; }
.back-link:hover { color: var(--accent); }

.post-head h1 { margin-top: 1.25rem; font-size: clamp(2rem, 7vw, 4.2rem); max-width: 22ch; }

.specs {
  display: flex;
  flex-wrap: wrap;
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  width: fit-content;
  max-width: 100%;
}

.specs div { padding: 0.7rem 1rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.specs dt { font-size: 0.62rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); }
.specs dd { margin-top: 0.15rem; font-size: 0.85rem; }
.specs dd.easy { color: var(--ok); }
.specs dd.medium { color: var(--warn); }
.specs dd.hard, .specs dd.insane { color: var(--bad); }

.post-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-top: 3rem;
  padding-bottom: 5rem;
}

@media (min-width: 1000px) {
  .post-grid { grid-template-columns: 220px minmax(0, 1fr); }
  .toc { position: sticky; top: 76px; align-self: start; }
}

.toc ol { list-style: none; margin-top: 0.8rem; border-left: 1px solid var(--line); }
.toc li a {
  display: block;
  padding: 0.25rem 0 0.25rem 0.9rem;
  margin-left: -1px;
  border-left: 1px solid transparent;
  font-size: 0.78rem;
  color: var(--muted);
  text-decoration: none;
}

.toc li.sub a { padding-left: 1.8rem; font-size: 0.74rem; }
.toc li a:hover { color: var(--text); }
.toc li a.active { color: var(--accent); border-left-color: var(--accent); }

/* ---------- Tekst van de write-up ---------- */
.prose { max-width: 76ch; font-size: 0.92rem; }

.prose > * + * { margin-top: 1.1rem; }

.prose h2, .prose h3 {
  scroll-margin-top: 76px;
  font-family: var(--display);
  font-stretch: 125%;
  text-transform: uppercase;
  line-height: 1.1;
}

.prose h2 {
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  font-size: 1.5rem;
  font-weight: 800;
}

.prose h2::before { content: attr(data-n) " "; color: var(--accent); font-family: var(--mono); font-size: 0.8rem; font-weight: 500; letter-spacing: 0.1em; vertical-align: 0.3em; }
.prose h3 { margin-top: 2rem; font-size: 1.05rem; font-weight: 700; }

.prose p, .prose li { color: #c9cdd3; }
.prose strong { color: var(--text); }
.prose a { color: var(--accent); text-underline-offset: 3px; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li + li { margin-top: 0.35rem; }
.prose li::marker { color: var(--accent); }

.prose blockquote {
  padding: 0.8rem 1rem;
  border-left: 2px solid var(--accent);
  background: var(--accent-soft);
}

.prose blockquote p { color: var(--text); }

.prose hr { border: 0; border-top: 1px dashed var(--line-2); margin: 2.5rem 0; }

.prose img { max-width: 100%; height: auto; border: 1px solid var(--line); }

.prose table { width: 100%; border-collapse: collapse; font-size: 0.82rem; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 0.5rem 0.75rem; border: 1px solid var(--line); }
.prose th { font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); background: var(--panel); }

.prose :not(pre) > code {
  font-size: 0.85em;
  padding: 0.1rem 0.35rem;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text);
}

/* Codeblokken */
.code-block { position: relative; border: 1px solid var(--line); background: var(--panel); }

.code-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.35rem 0.8rem;
  border-bottom: 1px solid var(--line);
}

.code-bar .copy {
  font: inherit;
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 0;
  cursor: pointer;
}

.code-bar .copy:hover { color: var(--accent); }

.code-block pre { overflow-x: auto; padding: 0.9rem 1rem; font-size: 0.82rem; line-height: 1.55; }
.code-block code { font-family: var(--mono); }

/* Syntax-kleuren in de huisstijl */
.hljs-comment, .hljs-quote { color: var(--dim); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-built_in, .hljs-meta .hljs-keyword { color: var(--accent); }
.hljs-string, .hljs-attr-value, .hljs-regexp { color: var(--ok); }
.hljs-number, .hljs-literal { color: var(--warn); }
.hljs-title, .hljs-title.function_, .hljs-section { color: #f0f2f5; font-weight: 600; }
.hljs-variable, .hljs-template-variable, .hljs-attr, .hljs-params { color: #aab2bd; }
.hljs-meta { color: var(--muted); }

/* Flags blijven verborgen tot je erop klikt */
.flag {
  cursor: pointer;
  filter: blur(5px);
  transition: filter 0.2s;
  user-select: none;
}

.flag.shown { filter: none; user-select: text; color: var(--ok) !important; }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--line); padding: 1.5rem 0; }

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.foot a { text-decoration: none; }
.foot a:hover { color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}