/* /engineering/engineering.css
   Shared styles for engineering deep-dive pages.
   Extends /projects/projects.css patterns for narrative-heavy writeups.
*/

/* ── Page header ────────────────────────────── */
.eng-head{
  display: grid;
  gap: 14px;
  padding: 8px 0 10px;
}

.eng-head__crumbs{
  display: grid;
  grid-auto-flow: column;
  gap: 10px;
  justify-content: start;
  align-items: center;
}

.eng-head__hero{
  padding: 22px;
}

.eng-head__meta{
  display: grid;
  grid-auto-flow: column;
  gap: 8px;
  justify-content: start;
  align-items: center;
  margin-bottom: 10px;
}

.eng-head__title{
  margin: 0;
  font-size: clamp(2rem, 3.6vw, 3rem);
  line-height: 1.06;
  letter-spacing: -0.5px;
}

.eng-head__lede{
  margin: 10px 0 0;
  max-width: 75ch;
  line-height: 1.6;
}

.eng-head__nav{
  margin-top: 16px;
  display: grid;
  grid-auto-flow: column;
  gap: 10px;
  justify-content: start;
  align-items: center;
}

.eng-head__facts{
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  max-width: 980px;
}

/* ── Body layout ────────────────────────────── */
.eng-body{
  padding-top: 6px;
  display: grid;
  gap: 18px;
}

/* ── Section blocks ─────────────────────────── */
.eng-section{
  padding: 20px;
  display: grid;
  gap: 16px;
}

.eng-section__head{
  display: grid;
  gap: 6px;
}

.eng-section__title{
  margin: 0;
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.2px;
}

.eng-section__subtitle{
  margin: 0;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.1px;
}

/* ── Code blocks ────────────────────────────── */
.code-block{
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-block__bar{
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--stroke);
  background: rgba(0,0,0,0.25);
}

.code-block__lang{
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
}

.code-block__body{
  padding: 14px;
  background: rgba(0,0,0,0.18);
  overflow-x: auto;
}

.code-block__body pre{
  margin: 0;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text);
  white-space: pre;
  tab-size: 2;
}

.code-block__body .hl-keyword{ color: #c792ea; }
.code-block__body .hl-string{ color: #c3e88d; }
.code-block__body .hl-comment{ color: rgba(255,255,255,0.35); font-style: italic; }
.code-block__body .hl-func{ color: #82aaff; }
.code-block__body .hl-type{ color: #ffcb6b; }
.code-block__body .hl-number{ color: #f78c6c; }
.code-block__body .hl-decorator{ color: #f07178; }
.code-block__body .hl-param{ color: #89ddff; }

/* ── Explanation cards ──────────────────────── */
.explain-grid{
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 12px;
}

.explain-card{
  grid-column: span 6;
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  background: rgba(0,0,0,0.14);
  padding: 16px;
  display: grid;
  gap: 8px;
}

.explain-card--full{
  grid-column: 1 / -1;
}

.explain-card--third{
  grid-column: span 4;
}

.explain-card__icon{
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  opacity: 0.8;
}

.explain-card__title{
  font-weight: 950;
  letter-spacing: 0.1px;
}

.explain-card__text{
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ── Diagram / flow ─────────────────────────── */
.diagram{
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  background: rgba(0,0,0,0.14);
  padding: 20px;
  display: grid;
  gap: 14px;
}

.diagram__title{
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.diagram__flow{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  align-items: center;
}

.diagram__flow--vertical{
  grid-template-columns: 1fr;
  max-width: 400px;
}

.diagram__node{
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  background: rgba(0,0,0,0.14);
  padding: 12px;
  display: grid;
  gap: 4px;
  text-align: center;
}

.diagram__node--accent{
  border-color: rgba(124,92,255,0.4);
  background: rgba(124,92,255,0.08);
}

.diagram__node--green{
  border-color: rgba(34,197,94,0.4);
  background: rgba(34,197,94,0.08);
}

.diagram__node--warn{
  border-color: rgba(245,158,11,0.4);
  background: rgba(245,158,11,0.08);
}

.diagram__node-label{
  font-weight: 900;
  font-size: 0.92rem;
}

.diagram__node-desc{
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.diagram__arrow{
  text-align: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 1rem;
}

.diagram__arrow--down{
  text-align: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 1rem;
  padding: 4px 0;
}

/* ── Badge row ──────────────────────────────── */
.badge-row{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.badge{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 0.82rem;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(0,0,0,0.18);
}

.badge--green{
  border-color: rgba(34,197,94,0.35);
  color: rgba(34,197,94,0.95);
}

.badge--accent{
  border-color: rgba(124,92,255,0.35);
  color: rgba(124,92,255,0.95);
}

.badge--warn{
  border-color: rgba(245,158,11,0.35);
  color: rgba(245,158,11,0.95);
}

.badge__dot{
  width: 8px;
  height: 8px;
  border-radius: 999px;
  display: inline-block;
}

.badge__dot--green{ background: rgba(34,197,94,0.85); }
.badge__dot--accent{ background: rgba(124,92,255,0.85); }
.badge__dot--warn{ background: rgba(245,158,11,0.85); }

/* ── Prose blocks ───────────────────────────── */
.eng-prose{
  color: var(--muted);
  line-height: 1.7;
  font-size: 0.98rem;
  max-width: 75ch;
}

.eng-prose strong{
  color: var(--text);
  font-weight: 800;
}

/* ── List blocks ────────────────────────────── */
.eng-list{
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
  display: grid;
  gap: 6px;
}

.eng-list li strong{
  color: var(--text);
}

/* ── Stat row ───────────────────────────────── */
.eng-stats{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.eng-stat{
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  background: rgba(0,0,0,0.14);
  padding: 14px;
  display: grid;
  gap: 4px;
}

.eng-stat__value{
  font-weight: 950;
  font-size: 1.3rem;
  letter-spacing: -0.3px;
}

.eng-stat__label{
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── Table ──────────────────────────────────── */
.eng-table{
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.eng-table th,
.eng-table td{
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--stroke);
}

.eng-table th{
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.eng-table td{
  color: var(--text);
}

.eng-table tr:last-child td{
  border-bottom: none;
}

/* ── Pyramid (test pyramid) ─────────────────── */
.pyramid{
  display: grid;
  gap: 6px;
  max-width: 500px;
  margin: 0 auto;
}

.pyramid__level{
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.pyramid__level--e2e{
  max-width: 55%;
  margin: 0 auto;
  background: rgba(245,158,11,0.08);
  border-color: rgba(245,158,11,0.3);
}

.pyramid__level--integration{
  max-width: 75%;
  margin: 0 auto;
  background: rgba(124,92,255,0.08);
  border-color: rgba(124,92,255,0.3);
}

.pyramid__level--unit{
  background: rgba(34,197,94,0.08);
  border-color: rgba(34,197,94,0.3);
}

.pyramid__label{
  font-weight: 900;
  font-size: 0.92rem;
}

.pyramid__count{
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── Timeline / career ──────────────────────── */
.timeline{
  display: grid;
  gap: 0;
  position: relative;
  padding-left: 28px;
}

.timeline::before{
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--stroke);
}

.timeline__item{
  position: relative;
  padding: 16px 0;
  border-bottom: 1px solid var(--stroke);
}

.timeline__item:last-child{
  border-bottom: none;
}

.timeline__dot{
  position: absolute;
  left: -24px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  border: 2px solid var(--accent);
  background: var(--bg);
}

.timeline__item--current .timeline__dot{
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(124,92,255,0.2);
}

.timeline__date{
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.timeline__role{
  font-weight: 900;
  font-size: 1.05rem;
  margin-bottom: 2px;
}

.timeline__company{
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.timeline__tech{
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

/* ── Contribution / PR cards ────────────────── */
.pr-card{
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  background: rgba(0,0,0,0.14);
  padding: 16px;
  display: grid;
  gap: 10px;
}

.pr-card__header{
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.pr-card__project{
  font-weight: 900;
}

.pr-card__status{
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 999px;
}

.pr-card__status--merged{
  background: rgba(124,92,255,0.12);
  color: rgba(124,92,255,0.95);
  border: 1px solid rgba(124,92,255,0.3);
}

.pr-card__status--open{
  background: rgba(34,197,94,0.12);
  color: rgba(34,197,94,0.95);
  border: 1px solid rgba(34,197,94,0.3);
}

.pr-card__summary{
  color: var(--muted);
  line-height: 1.6;
  font-size: 0.95rem;
}

/* ── Responsive ─────────────────────────────── */
@media (max-width: 980px){
  .explain-card{ grid-column: 1 / -1; }
  .explain-card--third{ grid-column: 1 / -1; }

  .eng-head__nav{
    grid-auto-flow: row;
    justify-content: stretch;
  }

  .eng-head__facts{
    grid-template-columns: 1fr;
  }

  .diagram__flow{
    grid-template-columns: 1fr;
  }
  .diagram__arrow{ display: none; }
}

@media (max-width: 700px){
  .eng-head__title{ font-size: clamp(1.5rem, 5vw, 2rem); }
  .eng-head__hero{ padding: 16px; }
  .eng-section{ padding: 14px; }

  .eng-head__nav .btn{ text-align: center; }

  .code-block__body{ padding: 10px; }
  .code-block__body pre{ font-size: 0.8rem; }

  .pyramid__level--e2e,
  .pyramid__level--integration{
    max-width: 100%;
  }

  .timeline{ padding-left: 22px; }
  .timeline__dot{ left: -18px; }
}

@media (max-width: 440px){
  .eng-head__hero{ padding: 12px; }
  .eng-section{ padding: 10px; }
  .eng-head__meta .chip{ font-size: 0.75rem; padding: 4px 8px; }
  .eng-stat__value{ font-size: 1.1rem; }
}