/* Friedrich Doku — hardware security research
   Palette grounded in instrumentation: deep board-black, probe blue (#23A0FF,
   sampled from the existing wordmark), sodium amber for measurement findings. */

:root {
  --ink:        #07090b;
  --ink-raise:  #0d1216;
  --ink-sunk:   #04070a;
  --line:       #1b242b;
  --line-soft:  #121a20;
  --mute:       #76858f;
  --text:       #d5dee4;
  --bright:     #f2f7fa;

  --probe:      #23a0ff;   /* systems I built */
  --probe-dim:  #1a4a73;
  --signal:     #e8a33d;   /* measurements / findings */
  --signal-dim: #6b4d1c;

  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, Segoe UI, sans-serif;

  --wrap: 1120px;
  --gut: clamp(1.25rem, 5vw, 4rem);
  --meta-col: 9.5rem;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 350;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- primitives ---------- */

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gut); }
.prose { max-width: 66ch; }

a { color: var(--probe); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.2em; }

:focus-visible {
  outline: 2px solid var(--probe);
  outline-offset: 3px;
  border-radius: 1px;
}

.skip {
  position: absolute; left: -9999px;
  background: var(--probe); color: var(--ink-sunk);
  padding: 0.6rem 1rem; font-family: var(--mono); font-size: 0.85rem; z-index: 99;
}
.skip:focus { left: 1rem; top: 1rem; }

/* ---------- masthead ---------- */

.masthead {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--ink) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.masthead > .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem; min-height: 3.5rem;
}
.sigil {
  font-family: var(--mono); font-size: 0.95rem; font-weight: 500;
  color: var(--bright); letter-spacing: 0.02em;
}
.sigil:hover { text-decoration: none; color: var(--probe); }
.masthead nav { display: flex; gap: clamp(0.9rem, 2.4vw, 1.9rem); }
.masthead nav a {
  font-family: var(--mono); font-size: 0.83rem; font-weight: 400;
  color: var(--mute);
}
.masthead nav a:hover { color: var(--bright); text-decoration: none; }
@media (max-width: 34rem) { .masthead nav a[data-optional] { display: none; } }

/* ---------- hero ---------- */

.hero {
  padding-top: clamp(3.5rem, 9vw, 7rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  position: relative; overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.name {
  font-family: var(--mono);
  font-size: clamp(2.7rem, 7.6vw, 4.8rem);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--probe);
  margin: 0 0 1.6rem;
}
/* the name on the papers, locked up tight under the one he goes by */
.name .fullname {
  display: block;
  font-size: clamp(0.9rem, 1.5vw, 1rem);
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.3;
  color: var(--signal);
  margin-top: 0.25rem;
}

.thesis {
  font-family: var(--sans);
  font-size: clamp(1.18rem, 2.5vw, 1.6rem);
  font-weight: 300;
  line-height: 1.36;
  letter-spacing: -0.012em;
  color: var(--bright);
  margin: 0 0 1.5rem;
  max-width: 24ch;
  text-wrap: balance;
}
.standfirst { color: var(--text); margin: 0 0 1.1rem; max-width: 52ch; }
.affil {
  font-family: var(--mono); font-size: 0.86rem; line-height: 1.75;
  color: var(--mute); margin: 0 0 2rem; max-width: 46ch;
}
.affil a { color: var(--mute); text-decoration: underline;
           text-decoration-color: var(--line); text-underline-offset: 0.22em; }
.affil a:hover { color: var(--text); text-decoration-color: var(--probe); }

.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.btn {
  font-family: var(--mono); font-size: 0.84rem;
  padding: 0.6rem 1.05rem;
  border: 1px solid var(--line);
  color: var(--text); background: transparent;
}
.btn:hover { border-color: var(--probe); color: var(--bright); text-decoration: none; }
.btn-key { border-color: var(--probe-dim); background: rgba(35,160,255,0.08); color: var(--bright); }
.btn-key:hover { background: rgba(35,160,255,0.16); }

/* portrait — bleeds into the page rather than sitting in a box */
.portrait {
  position: relative;
  -webkit-mask-image: linear-gradient(to bottom, #000 52%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 52%, transparent 100%);
}
.portrait img {
  display: block; width: 100%; height: auto;
  filter: grayscale(1) contrast(1.22) brightness(1.12);
  -webkit-mask-image: linear-gradient(to left, #000 50%, transparent 100%);
  mask-image: linear-gradient(to left, #000 50%, transparent 100%);
}
.portrait::after {           /* probe-blue cast, barely there */
  content: ""; position: absolute; inset: 0;
  background: var(--probe); opacity: 0.1;
  mix-blend-mode: soft-light; pointer-events: none;
}
@media (max-width: 54rem) {
  .hero-grid { grid-template-columns: 1fr; }
  .portrait { order: -1; max-width: 20rem; -webkit-mask-image: none; mask-image: none; }
  .portrait img { -webkit-mask-image: none; mask-image: none; }
}

/* ---------- sections ---------- */

.band { padding-block: clamp(3rem, 6vw, 4.75rem); }
.band + .band { border-top: 1px solid var(--line-soft); }

.band-head {
  display: flex; align-items: baseline; gap: 1.2rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}
.band-head h2 {
  font-family: var(--mono); font-size: 0.98rem; font-weight: 500;
  color: var(--bright); margin: 0; white-space: nowrap; letter-spacing: 0.005em;
}
.band-head::after {
  content: ""; flex: 1; height: 1px; background: var(--line);
  transform: translateY(-0.3em);
}
.band-note {
  font-family: var(--mono); font-size: 0.78rem; color: var(--mute);
  white-space: nowrap;
}

/* ---------- entry rows (research, experience) ---------- */

.entries { display: grid; gap: 0; }
.entry {
  display: grid;
  grid-template-columns: var(--meta-col) minmax(0, 1fr);
  gap: clamp(1.2rem, 3vw, 2.75rem);
  padding-block: clamp(1.6rem, 3vw, 2.3rem);
  border-top: 1px solid var(--line-soft);
}
.entry:first-child { border-top: 0; padding-top: 0; }

.entry-meta { font-family: var(--mono); font-size: 0.78rem; line-height: 1.6; color: var(--mute); }
.entry-when { display: block; color: var(--text); }
.entry-where { display: block; margin-top: 0.15rem; }

/* kind marker: amber = a measurement/finding, blue = a system I built.
   The word carries the meaning; colour only reinforces it. */
.kind {
  display: inline-block; margin-top: 0.7rem;
  font-family: var(--mono); font-size: 0.72rem;
  padding: 0.12rem 0.45rem; border: 1px solid currentColor;
}
.kind-finding { color: var(--signal); }
.kind-system  { color: var(--probe); }

.entry h3 {
  font-family: var(--sans); font-size: 1.16rem; font-weight: 500;
  line-height: 1.34; letter-spacing: -0.01em;
  color: var(--bright); margin: 0 0 0.6rem;
}
.entry p { margin: 0 0 0.75rem; max-width: 64ch; }
.entry p:last-child { margin-bottom: 0; }
.entry-links { font-family: var(--mono); font-size: 0.8rem; display: flex; flex-wrap: wrap; gap: 1.1rem; }

@media (max-width: 40rem) {
  .entry { grid-template-columns: 1fr; gap: 0.85rem; }
  .kind { margin-top: 0.4rem; }
}

/* ---------- publications ---------- */

.pubs { list-style: none; margin: 0; padding: 0; counter-reset: none; }
.pub {
  display: grid;
  grid-template-columns: var(--meta-col) minmax(0, 1fr);
  gap: clamp(1.2rem, 3vw, 2.75rem);
  padding-block: 1.5rem;
  border-top: 1px solid var(--line-soft);
}
.pub:first-child { border-top: 0; padding-top: 0; }
.pub-year { font-family: var(--mono); font-size: 0.78rem; color: var(--text); }
.pub-title { font-weight: 500; color: var(--bright); margin: 0 0 0.35rem; line-height: 1.45; }
.pub-authors, .pub-venue {
  font-size: 0.92rem; color: var(--mute); margin: 0 0 0.3rem;
}
.pub-authors .me { color: var(--text); font-weight: 500; }
.pub-venue em { font-style: italic; }
.pub-links { font-family: var(--mono); font-size: 0.78rem; display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 0.5rem; }
.status {
  font-family: var(--mono); font-size: 0.72rem; color: var(--signal);
  border: 1px solid var(--signal-dim); padding: 0.1rem 0.4rem;
}
@media (max-width: 40rem) { .pub { grid-template-columns: 1fr; gap: 0.5rem; } }

/* ---------- writing ---------- */

.notes { display: grid; gap: 0; }
.note {
  display: grid; grid-template-columns: var(--meta-col) minmax(0, 1fr);
  gap: clamp(1.2rem, 3vw, 2.75rem);
  padding-block: 1.4rem; border-top: 1px solid var(--line-soft);
  align-items: baseline;
}
.note:first-child { border-top: 0; padding-top: 0; }
.note-date { font-family: var(--mono); font-size: 0.78rem; color: var(--mute); }
.note h3 { font-family: var(--sans); font-size: 1.05rem; font-weight: 400; margin: 0 0 0.3rem; }
.note h3 a { color: var(--text); }
.note h3 a:hover { color: var(--probe); text-decoration: none; }
.note p { margin: 0; font-size: 0.94rem; color: var(--mute); max-width: 62ch; }
@media (max-width: 40rem) { .note { grid-template-columns: 1fr; gap: 0.35rem; } }

/* ---------- contact ---------- */

.contact-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: clamp(1.5rem, 4vw, 3rem);
}
.contact-grid h3 {
  font-family: var(--mono); font-size: 0.8rem; font-weight: 400;
  color: var(--mute); margin: 0 0 0.6rem;
}
.contact-grid p { margin: 0 0 0.4rem; font-family: var(--mono); font-size: 0.88rem; }
.pgp {
  margin-top: 2.5rem; border: 1px solid var(--line-soft);
  background: var(--ink-sunk);
}
.pgp summary {
  cursor: pointer; padding: 0.75rem 1rem;
  font-family: var(--mono); font-size: 0.8rem; color: var(--mute);
}
.pgp summary:hover { color: var(--text); }
.pgp pre {
  margin: 0; padding: 0 1rem 1rem; overflow-x: auto;
  font-family: var(--mono); font-size: 0.68rem; line-height: 1.5; color: var(--mute);
}

/* ---------- footer ---------- */

.foot {
  border-top: 1px solid var(--line-soft);
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding-block: 2.25rem 3rem;
  font-family: var(--mono); font-size: 0.76rem; color: var(--mute);
}
.foot > .wrap {
  display: flex; flex-wrap: wrap; gap: 0.6rem 2rem; justify-content: space-between;
}
.foot a { color: var(--mute); }
.foot a:hover { color: var(--text); }

/* ---------- article pages ---------- */

.article { padding-block: clamp(3rem, 7vw, 5rem) 2rem; }
.article-head { max-width: 66ch; margin-bottom: clamp(2.2rem, 5vw, 3.2rem); }
.back {
  font-family: var(--mono); font-size: 0.8rem; color: var(--mute);
  display: inline-block; margin-bottom: 1.6rem;
}
.back:hover { color: var(--probe); text-decoration: none; }
.article-head h1 {
  font-family: var(--sans); font-weight: 400;
  font-size: clamp(1.7rem, 4vw, 2.5rem); line-height: 1.2;
  letter-spacing: -0.022em; color: var(--bright); margin: 0 0 0.9rem;
  text-wrap: balance;
}
.article-meta { font-family: var(--mono); font-size: 0.79rem; color: var(--mute); }
.article-meta .vintage { color: var(--signal); }

.body { max-width: 68ch; }
.body h2 {
  font-family: var(--mono); font-size: 1.02rem; font-weight: 500; color: var(--bright);
  margin: 2.8rem 0 0.9rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--line-soft);
}
.body h3 {
  font-family: var(--mono); font-size: 0.88rem; font-weight: 500; color: var(--probe);
  margin: 2rem 0 0.7rem;
}
.body p { margin: 0 0 1.15rem; }
.body ul { margin: 0 0 1.15rem; padding-left: 1.1rem; }
.body li { margin-bottom: 0.4rem; }
.body img {
  display: block; width: 100%; height: auto; margin: 1.6rem 0 0.5rem;
  border: 1px solid var(--line); background: var(--ink-sunk);
}
.body figure { margin: 1.8rem 0; }
.body figure img { margin-top: 0; }
.body figcaption { font-family: var(--mono); font-size: 0.74rem; color: var(--mute); margin-top: 0.6rem; }

.body pre {
  background: var(--ink-sunk); border: 1px solid var(--line-soft);
  border-left: 2px solid var(--probe-dim);
  padding: 0.95rem 1.1rem; overflow-x: auto;
  margin: 0 0 1.3rem;
  font-family: var(--mono); font-size: 0.8rem; line-height: 1.62; color: var(--text);
}
.body code {
  font-family: var(--mono); font-size: 0.86em;
  background: var(--ink-raise); border: 1px solid var(--line-soft);
  padding: 0.1em 0.35em; color: var(--bright);
}
.body pre code { background: none; border: 0; padding: 0; font-size: inherit; color: inherit; }

.article-foot {
  max-width: 68ch; margin-top: 3.5rem; padding-top: 1.5rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--mono); font-size: 0.8rem; color: var(--mute);
}

/* ---------- 404 ---------- */
.lost { min-height: 62vh; display: grid; align-content: center; gap: 1rem; }
.lost h1 { font-family: var(--mono); font-size: clamp(2rem, 6vw, 3.2rem); color: var(--bright); margin: 0; }
.lost p { max-width: 46ch; margin: 0; }

/* ---------- photo gallery ---------- */

.gallery { columns: 3; column-gap: 0.85rem; margin-top: 0.5rem; }
@media (max-width: 62rem) { .gallery { columns: 2; } }
@media (max-width: 38rem) { .gallery { columns: 1; } }

.shot {
  display: block; break-inside: avoid; margin: 0 0 0.85rem;
  background: var(--ink-sunk); line-height: 0;
}
.shot img {
  width: 100%; height: auto; display: block;
  filter: brightness(0.94) saturate(0.96);
  transition: filter 180ms ease;
}
.shot:hover img, .shot:focus-visible img { filter: none; }
@media (prefers-reduced-motion: reduce) { .shot img { transition: none; } }

/* lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(3, 5, 7, 0.95);
  display: flex; align-items: center; justify-content: center;
  padding: clamp(1rem, 4vw, 3rem);
}
.lightbox[hidden] { display: none; }
.lb-img {
  max-width: 100%; max-height: 88vh; width: auto; height: auto;
  display: block; object-fit: contain;
}
.lightbox button {
  position: absolute; background: transparent; cursor: pointer;
  border: 1px solid var(--line); color: var(--text);
  font-family: var(--mono); line-height: 1;
}
.lightbox button:hover { border-color: var(--probe); color: var(--bright); }
.lb-close { top: 1rem; right: 1rem; font-size: 0.78rem; padding: 0.5rem 0.85rem; }
.lb-nav {
  top: 50%; transform: translateY(-50%);
  font-size: 1.6rem; padding: 0.35rem 0.85rem 0.5rem;
}
.lb-prev { left: 1rem; }
.lb-next { right: 1rem; }
.lb-count {
  position: absolute; bottom: 1rem; left: 50%; transform: translateX(-50%);
  margin: 0; font-family: var(--mono); font-size: 0.76rem; color: var(--mute);
}
@media (max-width: 38rem) {
  .lb-nav { top: auto; bottom: 1rem; transform: none; font-size: 1.3rem; }
  .lb-prev { left: 1rem; } .lb-next { right: 1rem; }
  .lb-count { bottom: 1.4rem; }
}

/* Section notes are nowrap so they sit tight against the heading rule on
   desktop; on narrow screens they need their own line or they overflow. */
@media (max-width: 46rem) {
  .band-head { flex-wrap: wrap; row-gap: 0.45rem; }
  .band-note { white-space: normal; order: 3; flex: 1 0 100%; }
}