Crane / jib

<div class='frame'><div class='view'><div class='hills'></div><div class='boom'><i class='head'></i></div><i class='pivot'></i><b>CRANE ARC</b></div><div class='arc'></div></div>

.frame{position:absolute;inset:0;overflow:hidden;background:var(--bg)}
.view{position:absolute;inset:7% 7% 22%;overflow:hidden;border:1px solid var(--line);background:linear-gradient(180deg,var(--accent-2),#b8d2c1 66%,#e4d09f)}
.hills{position:absolute;left:-8%;right:-8%;bottom:-34%;height:70%;border-radius:50% 50% 0 0;background:var(--accent-3);box-shadow:0 -25px 0 rgba(255,255,255,.16)}
.boom{position:absolute;left:8%;bottom:9%;width:69%;height:7px;border-radius:9px;background:var(--fg);transform-origin:4% 50%;animation:lift 4s ease-in-out infinite}
.head{position:absolute;right:-13px;top:-7px;width:20px;height:18px;border:2px solid var(--accent);background:var(--surface);transform:rotate(15deg)}
.head:after{content:'';position:absolute;right:-10px;top:4px;width:9px;height:7px;border:2px solid var(--accent);border-left:0}
.pivot{position:absolute;left:6%;bottom:6%;width:22px;height:22px;border:3px solid var(--fg);border-radius:50%;background:var(--surface)}
.view>b{position:absolute;right:6%;top:7%;font:700 clamp(8px,2vmin,12px) ui-monospace,monospace;letter-spacing:.14em;color:var(--fg)}
.arc{position:absolute;left:8%;bottom:10%;width:41%;height:46%;border:1px dashed var(--accent);border-color:var(--accent) transparent transparent var(--accent);border-radius:90% 0 0 0;transform:rotate(17deg)}
@keyframes lift{0%,8%{transform:rotate(-22deg)}52%{transform:rotate(24deg)}92%,100%{transform:rotate(-22deg)}}