/* Long-read pages (/runtime/, /team/, /learning/): a claim, a drawing, and the details underneath. */
main.rt { padding-block: 40px 140px; }
.rt-hero { display: flex; flex-direction: column; align-items: center; text-align: center; padding-top: 24px; }
.rt-hero .kicker { margin-bottom: 20px; }
.rt-title { margin: 0; font-family: var(--font-display); font-weight: 700; font-size: clamp(44px, 7.6vw, 104px); line-height: .98; letter-spacing: -0.045em; text-wrap: balance; font-variation-settings: "opsz" 96; }
.rt-title small { display: block; margin-top: 18px; font-size: clamp(17px, 1.9vw, 24px); font-weight: 500; letter-spacing: -0.012em; line-height: 1.3; color: var(--muted); }
.rt-hook { margin: 34px 0 0; max-width: 20em; font-family: var(--font-display); font-weight: 650; font-size: clamp(24px, 3vw, 38px); line-height: 1.12; letter-spacing: -0.03em; text-wrap: balance; color: var(--accent); }
.rt-def { margin: 20px 0 0; max-width: 42em; font-size: 17.5px; color: var(--muted); text-wrap: pretty; }
.rt-stats { display: flex; justify-content: center; flex-wrap: wrap; margin-top: 44px; }
.rt-stats > div { padding: 4px 36px; text-align: center; border-left: 1px solid var(--line); }
.rt-stats > div:first-child { border-left: 0; }
.rt-stats b { display: block; font-family: var(--font-display); font-weight: 700; font-size: clamp(36px, 4.4vw, 56px); line-height: 1; letter-spacing: -0.04em; }
.rt-stats span { display: block; margin-top: 8px; font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .05em; text-transform: uppercase; color: var(--faint); }
.rt-stats-note { margin: 18px 0 0; font-size: 13.5px; color: var(--faint); }

.rt-toc { position: sticky; top: 0; z-index: 20; margin-top: 56px; padding: 12px 0; background: rgba(228, 230, 239, .82); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.rt-toc-in { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; justify-content: center; }
.rt-toc-in::-webkit-scrollbar { display: none; }
.rt-toc a { flex: none; padding: 7px 14px; border-radius: 999px; font-size: 14px; color: var(--muted); text-decoration: none; white-space: nowrap; transition: background .2s ease, color .2s ease; }
.rt-toc a i { font-style: normal; margin-right: 8px; font-family: var(--font-mono); font-size: 11.5px; color: var(--faint); }
.rt-toc a:hover { color: var(--ink); }
.rt-toc a.on { background: var(--glass); box-shadow: var(--shadow); color: var(--ink); font-weight: 550; }
.rt-toc a.on i { color: var(--accent); }

.rt-sec { margin-top: 128px; scroll-margin-top: 72px; }
.rt-sec:first-of-type { margin-top: 88px; }
.rt-head { position: relative; padding-top: 6px; }
.rt-no { position: absolute; left: -8px; top: -54px; margin: 0; font-family: var(--font-display); font-weight: 700; font-size: 190px; line-height: 1; letter-spacing: -0.06em; color: rgba(94, 106, 210, .07); pointer-events: none; user-select: none; }
.rt-head .kicker { position: relative; color: var(--accent); }
.rt-head h2 { position: relative; margin: 0; max-width: 16em; font-family: var(--font-display); font-weight: 650; font-size: clamp(32px, 4vw, 54px); line-height: 1.03; letter-spacing: -0.035em; text-wrap: balance; }
.rt-lead { position: relative; margin: 20px 0 0; max-width: 40em; font-size: 18px; color: var(--muted); text-wrap: pretty; }
.rt-board { margin-top: 44px; padding: 30px 30px 26px; border-radius: 24px; background: var(--glass-strong, rgba(255, 255, 255, .86)); box-shadow: 0 1px 0 rgba(255, 255, 255, .85) inset, 0 0 0 1px rgba(44, 49, 68, .06), 0 44px 80px -46px rgba(44, 49, 68, .5); }
.rt-board.slim { padding: 22px 26px 18px; margin-top: 28px; max-width: 700px; }
.rt-hint { display: none; margin: 10px 0 0; font-family: var(--font-mono); font-size: 11.5px; color: var(--faint); }

.rt-cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 48px; margin-top: 44px; }
.rt-cols.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.rt-item { padding: 20px 0 6px; border-top: 1px solid var(--line); }
.rt-item h3 { margin: 0; font-family: var(--font-display); font-size: 21px; font-weight: 650; letter-spacing: -0.02em; line-height: 1.15; }
.rt-item h3 em { font-style: normal; color: var(--accent); font-family: var(--font-mono); font-size: 12.5px; margin-right: 10px; letter-spacing: .04em; vertical-align: 2px; }
.rt-item p { margin: 8px 0 0; font-size: 15.5px; color: var(--muted); text-wrap: pretty; }
.rt-item p + p { margin-top: 10px; }

.rt-walk { list-style: none; margin: 44px 0 0; padding: 0; counter-reset: w; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0 56px; }
.rt-walk li { position: relative; padding: 18px 0 18px 46px; border-top: 1px solid var(--line); counter-increment: w; font-size: 15.5px; color: var(--muted); text-wrap: pretty; }
.rt-walk li::before { content: counter(w); position: absolute; left: 0; top: 17px; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--accent); color: #fff; font-family: var(--font-mono); font-size: 12.5px; font-weight: 500; }
.rt-walk li b { color: var(--ink); font-weight: 600; }
.rt-walk-title { grid-column: 1 / -1; margin: 0 0 -26px; font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--faint); }

.rt-rows { margin-top: 44px; }
.rt-row { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 40px; padding: 22px 0; border-top: 1px solid var(--line); align-items: start; }
.rt-row:last-child { border-bottom: 1px solid var(--line); }
.rt-row h3 { margin: 0; font-family: var(--font-display); font-size: 20px; font-weight: 650; letter-spacing: -0.02em; line-height: 1.2; }
.rt-row h3 span { display: block; margin-top: 4px; font-family: var(--font-mono); font-size: 12px; font-weight: 400; letter-spacing: .02em; color: var(--faint); }
.rt-row p { margin: 0; font-size: 15.5px; color: var(--muted); text-wrap: pretty; }
.rt-row p b { color: var(--ink); font-weight: 600; }

.rt-steps { list-style: none; margin: 44px 0 0; padding: 0; counter-reset: s; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 48px; }
.rt-steps li { position: relative; padding: 18px 0 18px 44px; border-top: 1px solid var(--line); counter-increment: s; font-size: 15px; color: var(--muted); text-wrap: pretty; }
.rt-steps li::before { content: counter(s); position: absolute; left: 0; top: 17px; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; background: var(--accent); color: #fff; font-family: var(--font-mono); font-size: 12px; font-weight: 500; }
.rt-steps li b { display: block; color: var(--ink); font-family: var(--font-display); font-size: 17px; font-weight: 650; letter-spacing: -0.015em; margin-bottom: 3px; }

.rt-aside { margin-top: 44px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: start; }
.rt-doc { padding: 18px 20px 20px; border-radius: 18px; background: var(--glass-strong, rgba(255, 255, 255, .86)); box-shadow: 0 1px 0 rgba(255, 255, 255, .85) inset, 0 0 0 1px rgba(44, 49, 68, .06), 0 34px 56px -34px rgba(44, 49, 68, .5); font-size: 13px; }
.rt-doc-top { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 8px; font-family: var(--font-mono); font-size: 11px; color: var(--faint); }
.rt-doc-top b { font-weight: 500; color: var(--ink); }
.rt-doc dl { margin: 0; }
.rt-doc dl > div { display: grid; grid-template-columns: 124px minmax(0, 1fr); gap: 12px; padding: 8px 0; border-top: 1px solid var(--line); }
.rt-doc dt { font-family: var(--font-mono); font-size: 11px; letter-spacing: .04em; text-transform: uppercase; color: var(--faint); padding-top: 2px; }
.rt-doc dd { margin: 0; color: var(--ink); line-height: 1.45; }
.rt-doc dd em { font-style: normal; color: var(--muted); }
.rt-list { list-style: none; margin: 0; padding: 0; }
.rt-list li { position: relative; padding: 13px 0 13px 24px; border-top: 1px solid var(--line); font-size: 15.5px; color: var(--muted); text-wrap: pretty; }
.rt-list li:last-child { border-bottom: 1px solid var(--line); }
.rt-list li::before { content: ""; position: absolute; left: 0; top: 22px; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); }
.rt-list li b { color: var(--ink); font-weight: 600; }
.rt-sub { margin: 0 0 14px; font-family: var(--font-display); font-size: 22px; font-weight: 650; letter-spacing: -0.025em; line-height: 1.15; }

.rt-end { margin-top: 140px; text-align: center; padding-top: 72px; border-top: 1px solid var(--line); }
.rt-end p.big { margin: 0 auto; max-width: 17em; font-family: var(--font-display); font-weight: 650; font-size: clamp(28px, 3.6vw, 48px); line-height: 1.08; letter-spacing: -0.035em; text-wrap: balance; }
.rt-end p.big span { color: var(--accent); }
.rt-end .sub { margin: 18px auto 0; max-width: 34em; color: var(--muted); font-size: 17px; text-wrap: pretty; }
.rt-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px 34px; margin-top: 36px; }
.rt-links a { display: inline-flex; align-items: center; gap: 8px; padding-bottom: 3px; font-size: 16px; font-weight: 550; color: var(--accent); text-decoration: none; border-bottom: 1.5px solid rgba(94, 106, 210, .35); transition: border-color .2s ease, gap .2s ease; }
.rt-links a:hover { border-color: var(--accent); gap: 12px; }
.rt-links svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

@media (max-width: 1100px) {
  .rt-cols { grid-template-columns: minmax(0, 1fr); }
  .rt-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rt-aside { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .rt-walk { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 860px) {
  .rt-sec { margin-top: 96px; }
  .rt-no { font-size: 120px; top: -30px; left: -4px; }
  .rt-board { padding: 18px 0 14px 18px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .rt-board .dg { min-width: 800px; padding-right: 18px; }
  .rt-hint { display: block; }
  .rt-row { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .rt-stats > div { padding: 4px 18px; }
  .rt-toc-in { justify-content: flex-start; }
}
@media (max-width: 600px) {
  .rt-steps { grid-template-columns: minmax(0, 1fr); }
  .rt-doc dl > div { grid-template-columns: minmax(0, 1fr); gap: 2px; }
}

/* Sequence diagrams and small helpers */
.rt-steps.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.rt-two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; margin-top: 44px; align-items: start; }
@media (max-width: 1100px) { .rt-two { grid-template-columns: minmax(0, 1fr); gap: 36px; } }
.rt-cite { margin: 28px 0 0; padding-left: 18px; border-left: 2px solid rgba(94, 106, 210, .4); font-size: 15px; color: var(--muted); max-width: 46em; text-wrap: pretty; }
.rt-cite b { color: var(--ink); font-weight: 600; }
.rt-table { margin-top: 36px; border-top: 1px solid var(--line); }
.rt-table > div { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 4fr) minmax(0, 4fr); gap: 32px; padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 14.5px; color: var(--muted); }
.rt-table > div:first-child { padding: 12px 0; font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .05em; text-transform: uppercase; color: var(--faint); }
.rt-table b { display: block; color: var(--ink); font-weight: 600; }
.rt-table em { display: block; font-style: normal; font-family: var(--font-mono); font-size: 11.5px; color: var(--faint); margin-top: 2px; }
@media (max-width: 860px) { .rt-table > div { grid-template-columns: minmax(0, 1fr); gap: 6px; } .rt-table > div:first-child { display: none; } }
.rt-stats.words b { font-size: clamp(24px, 2.8vw, 36px); letter-spacing: -0.03em; }
.rt-stats.words > div { padding: 4px 30px; }