/* Kinematics Lab — 지면 규칙(크림 바탕 · 테라코타 강조 · 각진 모서리)을 따른다. */

.gpk{
  --k-ink:#111; --k-soft:#555; --k-faint:#8a8a85; --k-line:#e3e4dd;
  --k-accent:#b5502a; --k-accent2:#2f5d50; --k-blue:#2b5d8a;
  --k-paper:#fff; --k-cream:#fbfcf6;

  /* 본문 한 줄(720px)보다 넓게 펼친다. 좁은 화면에서는 저절로 줄어든다. */
  width:min(1140px, calc(100vw - 40px));
  margin-left:50%; transform:translateX(-50%);
  background:var(--k-paper);
  border:1px solid var(--k-line);
  border-radius:2px;
  overflow:hidden;
  font-size:14px; line-height:1.55; color:var(--k-ink);
  word-break:keep-all;
}
.gpk *{box-sizing:border-box}
.gpk p{margin:0}

/* ── 머리 ───────────────────────────────────────────── */
.gpk-head{position:relative;padding:18px 20px 14px;border-bottom:1px solid var(--k-line);background:var(--k-cream)}
.gpk-label{font-size:11px;font-weight:800;letter-spacing:.18em;color:var(--k-accent);margin:0 0 6px}
.gpk-title{font-size:19px;font-weight:800;letter-spacing:-.03em;margin:0 0 6px;line-height:1.3}
.gpk-hint{font-size:12.5px;color:var(--k-soft);margin:0;padding-right:150px}

/* 되돌리기 — 머리말 오른쪽 위에 늘 같은 자리에 둔다. */
.gpk-reset{
  position:absolute;top:16px;right:18px;
  font:inherit;font-size:11.5px;font-weight:700;letter-spacing:-.01em;
  padding:6px 12px;border:1px solid var(--k-line);border-radius:20px;
  background:#fff;color:var(--k-soft);cursor:pointer;
  display:inline-flex;align-items:center;gap:5px;
}
.gpk-reset::before{content:"\21BA";font-size:13px;line-height:1}
.gpk-reset:hover{border-color:var(--k-ink);color:var(--k-ink)}
.gpk-reset.is-done{border-color:var(--k-accent2);color:var(--k-accent2);background:rgba(47,93,80,.06)}
.gpk-reset[hidden]{display:none}
.gpk-nojs{padding:24px;color:var(--k-soft)}

/* ── 몸 ─────────────────────────────────────────────── */
.gpk-body{display:grid;gap:0}
.gpk-body--split{grid-template-columns:minmax(0,1.02fr) minmax(0,1fr)}
.gpk-body--pair{grid-template-columns:1fr 1fr}
.gpk-body--split > .gpk-side{border-left:1px solid var(--k-line)}
.gpk-body--pair  > .gpk-pane + .gpk-pane{border-left:1px solid var(--k-line)}
.gpk-stage,.gpk-side,.gpk-pane{padding:16px;min-width:0}

.gpk-cv{display:block;width:100%;height:260px;touch-action:none;cursor:grab;background:var(--k-paper)}
.gpk-cv--tall{height:330px}
.gpk-cv--chart{height:108px;cursor:default;touch-action:auto}
.gpk-cv--chart-lg{height:190px}
.gpk-cv.is-grab{cursor:grabbing}

.gpk-pane-t{font-size:13px;font-weight:800;letter-spacing:-.02em;margin:0 0 2px}
.gpk-pane-t span{font-weight:700;font-size:10px;letter-spacing:.14em;color:var(--k-faint);margin-left:6px}
.gpk-pane-s{font-size:12px;color:var(--k-soft);margin:0 0 8px}
.gpk-pane-foot{margin-top:10px;display:flex;flex-wrap:wrap;gap:10px 18px;align-items:flex-end}

/* ── 눈금·읽을거리 ──────────────────────────────────── */
.gpk-reads{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:12px}
.gpk-read{display:flex;flex-direction:column;min-width:0}
.gpk-read-n{font-size:10.5px;font-weight:700;letter-spacing:.08em;color:var(--k-faint);text-transform:uppercase}
.gpk-read-v{font-size:16px;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.gpk-read-h{font-size:10.5px;color:var(--k-faint)}
.gpk-read-v.is-good{color:var(--k-accent2)}
.gpk-read-v.is-warn{color:#a8791f}
.gpk-read-v.is-bad{color:var(--k-accent)}

/* ── 조작부 ─────────────────────────────────────────── */
.gpk-ctrls{margin-top:14px;display:grid;grid-template-columns:1fr 1fr;gap:10px 18px}
.gpk-ctrl{min-width:0}
.gpk-ctrl-lab{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-size:11.5px;margin-bottom:2px}
.gpk-ctrl-name{color:var(--k-soft);font-weight:600}
.gpk-ctrl-val{font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.02em}

.gpk-range{-webkit-appearance:none;appearance:none;width:100%;height:18px;background:transparent;cursor:pointer;margin:0;display:block}
.gpk-range::-webkit-slider-runnable-track{height:2px;background:var(--k-line)}
.gpk-range::-moz-range-track{height:2px;background:var(--k-line)}
.gpk-range::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:var(--k-accent);border:2px solid #fff;box-shadow:0 0 0 1px var(--k-accent);margin-top:-6px}
.gpk-range::-moz-range-thumb{width:12px;height:12px;border-radius:50%;
  background:var(--k-accent);border:2px solid #fff;box-shadow:0 0 0 1px var(--k-accent)}
.gpk-range:focus-visible{outline:2px solid var(--k-accent);outline-offset:3px}

.gpk-btns{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:8px;margin-top:2px}
.gpk-btn{font:inherit;font-size:12px;font-weight:700;letter-spacing:-.01em;
  padding:7px 13px;border:1px solid var(--k-line);background:var(--k-cream);color:var(--k-ink);
  border-radius:2px;cursor:pointer}
.gpk-btn:hover{border-color:var(--k-ink)}
.gpk-btn--pri{background:var(--k-ink);color:#fff;border-color:var(--k-ink)}
.gpk-btn--pri:hover{background:#000}

.gpk-warn{margin-top:10px;font-size:12px;line-height:1.6;color:var(--k-accent);
  border-left:3px solid var(--k-accent);padding:6px 0 6px 10px}
.gpk-warn b{font-weight:800}

/* ── 그래프 ─────────────────────────────────────────── */
.gpk-chart + .gpk-chart{margin-top:10px}
.gpk-chart-t{font-size:11px;font-weight:800;letter-spacing:.04em;color:var(--k-soft);margin:0 0 2px}
.gpk-legend{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:11px;color:var(--k-soft);margin-top:2px}
.gpk-lg{display:inline-flex;align-items:center;gap:5px}
.gpk-lg-k{width:14px;height:2px;display:inline-block}
.gpk-side-note{font-size:11px;color:var(--k-faint);margin-top:10px}

/* ── 결론판 ─────────────────────────────────────────── */
.gpk-verdict{border:1px solid var(--k-line);border-radius:2px;padding:14px;background:var(--k-cream)}
.gpk-v-label{font-size:10.5px;font-weight:800;letter-spacing:.12em;color:var(--k-faint);text-transform:uppercase;margin:0 0 10px}
.gpk-v-row{display:grid;grid-template-columns:1fr auto;gap:2px 10px;margin-bottom:10px}
.gpk-v-name{font-size:12px;color:var(--k-soft);font-weight:600}
.gpk-v-num{font-size:12px;color:var(--k-soft);font-variant-numeric:tabular-nums;text-align:right}
.gpk-v-num b{font-size:19px;font-weight:800;color:var(--k-faint);letter-spacing:-.03em}
.gpk-v-row.is-real .gpk-v-num b{color:var(--k-accent)}
.gpk-v-bar{grid-column:1/-1;height:7px;background:rgba(17,17,17,.07);display:block;border-radius:1px;overflow:hidden}
.gpk-v-bar i{display:block;height:100%;background:var(--k-faint);transition:width .18s ease-out}
.gpk-v-row.is-real .gpk-v-bar i{background:var(--k-accent)}
.gpk-v-mult{margin:12px 0 6px;display:flex;align-items:baseline;gap:7px;border-top:1px solid var(--k-line);padding-top:12px}
.gpk-v-mult b{font-size:38px;font-weight:800;letter-spacing:-.05em;line-height:1;font-variant-numeric:tabular-nums}
.gpk-v-mult span{font-size:13px;font-weight:700;color:var(--k-soft)}
.gpk-v-mult.is-good b{color:var(--k-accent2)}
.gpk-v-mult.is-warn b{color:#a8791f}
.gpk-v-mult.is-bad  b{color:var(--k-accent)}
.gpk-v-note{font-size:12px;line-height:1.65;color:var(--k-soft)}
.gpk-v-note b{color:var(--k-ink);font-weight:800}

/* ── 메모칸 ─────────────────────────────────────────── */
.gpk-note{border-left:3px solid var(--k-accent2);background:rgba(47,93,80,.05);
  padding:16px 18px;border-radius:2px;margin:0}
.gpk-note-t{font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
  color:var(--k-accent2);margin:0 0 8px}
.gpk-note-b p{margin:0;font-size:15px;line-height:1.85}
.gpk-note-b p + p{margin-top:10px}

/* ── 길잡이 그림 ────────────────────────────────────── */
.gpk-rm{
  width:min(1140px, calc(100vw - 40px));
  margin-left:50%; transform:translateX(-50%);
  border-top:2px solid var(--gp-ink,#111);border-bottom:1px solid var(--gp-line,#e3e4dd);
  padding:24px 0 18px;
}
.gpk-rm-label{font-size:11px;font-weight:800;letter-spacing:.18em;text-transform:uppercase;
  color:#b5502a;margin:0 0 20px;text-align:center}
.gpk-rm .gpk-rm-track{display:flex;align-items:flex-start;justify-content:center;gap:0;
  list-style:none;margin:0;padding:0;flex-wrap:wrap}
.gpk-rm .gpk-rm-track li{margin:0;padding:0}
.gpk-rm .gpk-rm-track li + li{margin-top:0}
.gpk-rm .gpk-rm-step{display:flex;flex-direction:column;align-items:center;text-align:center;
  width:150px;padding:0 4px}
.gpk-rm-part{font-size:10px;font-weight:800;letter-spacing:.12em;color:#8a8a85;margin-bottom:8px}
.gpk-rm-art{position:relative;display:block;width:56px;height:56px;margin-bottom:10px}
.gpk-rm-glyph{width:56px;height:56px;display:block;fill:none;
  stroke:#111;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.gpk-rm-glyph .a{stroke:#b5502a}
.gpk-rm-glyph .d{fill:#111;stroke:none}
.gpk-rm-sym{position:absolute;right:-9px;bottom:-6px;font-size:19px;font-weight:800;
  color:#b5502a;line-height:1;background:#fbfcf6;padding:0 2px}
.gpk-rm-name{font-size:14px;font-weight:800;letter-spacing:-.03em;margin-bottom:4px}
.gpk-rm-desc{font-size:11.5px;line-height:1.55;color:#555;word-break:keep-all}
.gpk-rm .gpk-rm-arrow{align-self:center;margin-top:22px}
.gpk-rm-arrow svg{width:34px;height:12px;display:block;fill:none;stroke:#c9cbc1;stroke-width:1.6;
  stroke-linecap:round;stroke-linejoin:round}
.gpk-rm-cap{font-size:11.5px;color:#8a8a85;text-align:center;margin:20px 0 0}

/* ── 기호와 값을 담는 표 ────────────────────────────── */
.gpk-vars{margin-top:14px;border-top:1px solid var(--k-line);padding-top:11px}
.gpk-vars-t{font-size:10.5px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;
  color:var(--k-faint);margin:0 0 7px}
.gpk .gpk-vars table{width:100%;border-collapse:collapse;font-size:12px;table-layout:fixed;margin:0}
.gpk .gpk-vars thead th{font-size:9.5px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
  color:var(--k-faint);text-align:left;padding:0 8px 5px 0;
  border:0;border-bottom:1px solid var(--k-line);background:none}
.gpk .gpk-vars thead th.gpk-vars-hv{text-align:right;padding-right:0}
.gpk .gpk-vars tbody th,
.gpk .gpk-vars tbody td{padding:5px 8px 5px 0;border:0;border-bottom:1px solid rgba(227,228,221,.65);
  text-align:left;vertical-align:baseline;background:none}
.gpk .gpk-vars tbody tr:last-child th,
.gpk .gpk-vars tbody tr:last-child td{border-bottom:0}
.gpk .gpk-vars-s{width:20%;font-weight:800;color:var(--k-ink);white-space:nowrap;letter-spacing:-.01em}
.gpk .gpk-vars-m{width:47%;font-weight:600;color:var(--k-soft);word-break:keep-all}
.gpk .gpk-vars-v{width:33%;text-align:right;padding-right:0;font-weight:800;
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;color:var(--k-ink)}
.gpk .gpk-vars-v.is-good{color:var(--k-accent2)}
.gpk .gpk-vars-v.is-warn{color:#a8791f}
.gpk .gpk-vars-v.is-bad{color:var(--k-accent)}
.gpk .gpk-vars-v.is-todo{font-weight:600;color:var(--k-faint);font-size:11px}

/* ── 주석 ───────────────────────────────────────────── */
.gpk-notes{margin-top:13px}
.gpk-notes-t{font-size:10.5px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;
  color:var(--k-faint);margin:0 0 6px}
.gpk .gpk-notes ul{margin:0;padding:0;list-style:none}
.gpk .gpk-notes li{position:relative;margin:0;padding:0 0 0 13px;
  font-size:11.5px;line-height:1.7;color:var(--k-soft);word-break:keep-all}
.gpk .gpk-notes li + li{margin-top:4px}
.gpk .gpk-notes li::before{content:"";position:absolute;left:2px;top:.66em;
  width:4px;height:4px;border-radius:50%;background:#c9cbc1}
.gpk .gpk-notes li b{color:var(--k-ink);font-weight:800}
.gpk .gpk-notes li em{font-style:normal;font-weight:800;color:var(--k-accent)}

/* ── 좁은 화면 ──────────────────────────────────────── */
@media (max-width:900px){
  .gpk-body--split,.gpk-body--pair{grid-template-columns:1fr}
  .gpk-body--split > .gpk-side{border-left:0;border-top:1px solid var(--k-line)}
  .gpk-body--pair  > .gpk-pane + .gpk-pane{border-left:0;border-top:1px solid var(--k-line)}
  .gpk-cv--tall{height:280px}
}
@media (max-width:620px){
  .gpk,.gpk-rm{width:calc(100vw - 24px)}
  .gpk-hint{padding-right:0}
  .gpk-reset{position:static;margin-top:10px}
  .gpk-ctrls{grid-template-columns:1fr}
  .gpk-cv{height:220px}
  .gpk-cv--tall{height:250px}
  .gpk-rm-step{width:132px}
  .gpk-rm-arrow{display:none}
  .gpk-v-mult b{font-size:32px}
  .gpk .gpk-vars-s{width:24%}
  .gpk .gpk-vars-m{width:42%}
  .gpk .gpk-vars-v{width:34%}
}

/* ── 개념도 · 풀이표 ────────────────────────────────── */
.gpk-ctrl--wide{flex:1 1 100%}
.gpk-btn--alt{background:var(--k-accent2);color:#fff;border-color:var(--k-accent2)}
.gpk-btn--alt:hover{background:#24483e;border-color:#24483e}

.gpk-v-name em{display:block;font-style:normal;font-weight:600;font-size:10.5px;color:var(--k-faint);letter-spacing:0}

.gpk-steps{margin-top:12px;border:1px solid var(--k-line);border-radius:2px;padding:12px 13px;background:var(--k-paper)}
.gpk-steps-t{font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--k-accent2);margin:0 0 8px}
.gpk-steps table{width:100%;border-collapse:collapse;font-size:12px}
.gpk-steps th,.gpk-steps td{border:0;border-bottom:1px solid var(--k-line);padding:6px 0;vertical-align:top;text-align:left}
.gpk-steps th{font-weight:700;color:var(--k-soft);width:52%;padding-right:10px}
.gpk-steps th span{display:block;font-weight:600;font-size:10.5px;color:var(--k-faint)}
.gpk-steps td{font-variant-numeric:tabular-nums;text-align:right;color:var(--k-soft)}
.gpk-steps td b{color:var(--k-ink);font-weight:800}
.gpk-steps tr.is-sum th,.gpk-steps tr.is-sum td{border-bottom:0;padding-top:8px}
.gpk-steps tr.is-sum td b{font-size:17px;letter-spacing:-.03em;color:var(--k-accent2)}
.gpk-steps-s{display:block;font-size:10.5px;color:var(--k-faint);font-weight:600}
.gpk-steps-n{font-size:11.5px;line-height:1.65;color:var(--k-faint);margin:9px 0 0}
.gpk-steps-x{font-size:12px;color:var(--k-accent);margin:0}