/* ============================================================
   NIMBUS — long-form mission log layout
   ============================================================ */

.art-head {
  position: relative;
  padding-top: calc(var(--nav-h) + clamp(3rem, 8vw, 6rem));
  padding-bottom: clamp(2rem, 5vw, 3rem);
}
.art-head .kicker { margin-bottom: 1.1rem; }
.art-head h1 {
  font-size: clamp(2rem, 5.2vw, 4rem);
  line-height: 1.04;
  font-weight: 800;
  font-family: var(--f-display);
  letter-spacing: -0.015em;
  max-width: 20ch;
}
.art-meta {
  display: flex; align-items: center; gap: 0.85rem; flex-wrap: wrap;
  margin-top: 1.6rem; padding-top: 1.4rem;
  border-top: 1px solid var(--hairline);
  font-family: var(--f-mono); font-size: 0.64rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink-3);
}
.art-meta .sep { width: 3px; height: 3px; border-radius: 50%; background: var(--ink-4); }

/* full-bleed opening image */
.art-hero {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--hairline);
  aspect-ratio: 21 / 9;
  background: #060a14;
}
.art-hero img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.92) brightness(0.86); }
.art-hero::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(4,6,14,0.35), transparent 45%, rgba(4,6,14,0.6));
  pointer-events: none;
}

/* body column + sticky rail */
.art-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
  padding-bottom: clamp(4rem, 8vw, 6rem);
}

.prose { max-width: 68ch; }
.prose > * + * { margin-top: 1.5rem; }
.prose p { font-size: 1.03rem; line-height: 1.85; color: var(--ink-2); }
.prose h2 {
  font-family: var(--f-display);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-top: 3rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--hairline);
}
.prose h3 { font-size: 1.1rem; font-weight: 600; margin-top: 2.2rem; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(53,230,255,0.35); }
.prose ul { padding-left: 1.2rem; display: grid; gap: 0.6rem; }
.prose li { font-size: 0.98rem; line-height: 1.75; color: var(--ink-2); }
.prose li::marker { color: var(--cyan); }

/* drop-cap on the opening paragraph */
.prose .opener::first-letter {
  float: left;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 3.6em;
  line-height: 0.82;
  padding: 0.06em 0.14em 0 0;
  background: linear-gradient(160deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* pull quote */
.pullquote {
  position: relative;
  margin-block: 2.6rem;
  padding: 1.6rem 0 1.6rem 1.8rem;
  border-left: 2px solid var(--cyan);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.55;
  color: var(--ink);
  font-weight: 500;
}
.pullquote::after {
  content: '';
  position: absolute; inset: 0 auto 0 -1px; width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  box-shadow: 0 0 18px rgba(53,230,255,0.6);
}

/* figures */
figure { margin-block: 2.6rem; }
figure .frame {
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: #060a14;
}
figure img, figure video { width: 100%; display: block; }
figure img { transition: transform 1.2s var(--ease); }
figure .frame:hover img { transform: scale(1.03); }
figure figcaption {
  margin-top: 0.85rem;
  font-family: var(--f-mono);
  font-size: 0.7rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  padding-left: 0.9rem;
  border-left: 1px solid rgba(53,230,255,0.4);
}

/* spec table */
.spec { width: 100%; border-collapse: collapse; margin-block: 2.2rem; font-family: var(--f-mono); font-size: 0.8rem; }
.spec th, .spec td { text-align: left; padding: 0.75rem 0.9rem; border-bottom: 1px solid var(--hairline); }
.spec th { color: var(--ink-3); font-weight: 400; font-size: 0.62rem; letter-spacing: 0.2em; text-transform: uppercase; }
.spec td:last-child { color: var(--cyan); text-align: right; }

/* sticky rail */
.rail { position: sticky; top: calc(var(--nav-h) + 2rem); display: grid; gap: 1.2rem; }
.rail-card { padding: 1.3rem 1.4rem; }
.rail h4 {
  font-family: var(--f-mono); font-size: 0.58rem; letter-spacing: 0.26em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 0.9rem;
}
.toc { display: grid; gap: 0.15rem; }
.toc a {
  font-size: 0.83rem; color: var(--ink-3); padding: 0.45rem 0.7rem;
  border-radius: 8px; border-left: 2px solid transparent;
  transition: color 0.3s, background 0.3s, border-color 0.3s;
}
.toc a:hover { color: var(--ink); background: rgba(255,255,255,0.04); }
.toc a.on { color: var(--cyan); border-left-color: var(--cyan); background: rgba(53,230,255,0.06); }

/* prev / next */
.art-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  padding-top: 2.5rem; margin-top: 3rem; border-top: 1px solid var(--hairline);
}
.art-nav a { padding: 1.3rem 1.5rem; display: grid; gap: 0.4rem; }
.art-nav .dir { font-family: var(--f-mono); font-size: 0.6rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--cyan); }
.art-nav strong { font-size: 0.95rem; font-weight: 600; line-height: 1.35; }
.art-nav .next { text-align: right; }

@media (max-width: 980px) {
  .art-wrap { grid-template-columns: 1fr; }
  .rail { position: static; }
  .art-hero { aspect-ratio: 16 / 9; }
}
@media (max-width: 620px) {
  .art-nav { grid-template-columns: 1fr; }
  .art-nav .next { text-align: left; }
}