/* 자전거 속도 계산기 전용 CSS (2026-10-10). 2패널 계산형 레이아웃 bk-*, 시·분·초 칸, 속도계 게이지(SVG, 바늘 transition), 파워 구성 막대, 기어 입력·기어표, 경사별 비교표. 공용 부품은 assets/v2.css */
.bk-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr)}
.bk-in{padding:16px 18px 18px;min-width:0}
.bk-fields{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px 14px}
.bk-fields .full{grid-column:1 / -1}
.bk-fields .v2-f{min-width:0}
.bk-fields .v2-f>.v2-label{display:block}
.bk-fields .v2-f>span.v2-label{margin-bottom:5px} /* label 요소가 아닌 span 라벨도 같은 간격(옆 칸과 위·아래 정렬, align-check row) */
.bk-fields [hidden]{display:none}
.bk-sub{margin-top:4px;padding-top:12px;border-top:1px solid var(--soft)}
.bk-sublabel{display:block;color:var(--ink)}
.bk-seg{margin-top:6px;flex-wrap:wrap}
.bk-seg button{height:32px;padding:0 10px;font-family:var(--sans);font-size:12.5px;font-weight:700;white-space:nowrap}
.bk-chips{margin-top:8px;flex-wrap:wrap}
.bk-chips button{height:28px;padding:0 10px;font-family:var(--sans);font-size:12px;font-weight:600}
.bk-dist{max-width:220px}
.bk-list input{text-align:left;font-size:14px;letter-spacing:0}
.bk-hms{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;max-width:360px}
.bk-wind{display:block} /* 입력(최대 220px) 아래에 방향 버튼: 좁은 본문(1181~1250px)과 en·es 긴 버튼에서도 입력 폭이 줄지 않는다(align-check squeeze) */
.bk-wind>.v2-input{max-width:220px}
.bk-wdir{margin-top:8px;flex-wrap:wrap}
.bk-wdir button{height:32px}
.bk-select{display:block;width:100%;max-width:100%;height:var(--v2-ctl,42px);padding:0 10px;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:14px;font-weight:600}
.bk-select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.bk-cur{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:6px;align-items:center}
.bk-x{font-family:var(--sans);font-size:13px;color:var(--muted)}
.bk-hint{display:block;margin-top:6px;font-family:var(--sans);font-size:12px;line-height:1.5;color:var(--muted)}
.bk-help{margin:12px 0 0;font-family:var(--sans);font-size:12.5px;line-height:1.6;color:var(--muted)}
.bk-acts{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-top:14px}
.bk-out{padding:16px 18px 18px;min-width:0;border-left:1px solid var(--soft);display:flex;flex-direction:column}
.bk-out .v2-label{display:block;margin-bottom:6px}
.bk-out .v2-big{flex-wrap:wrap;row-gap:6px}
.bk-out .v2-big>span{min-width:0;overflow-wrap:anywhere}
.bk-out .v2-big small{flex-basis:100%;display:block;margin:0;font-family:var(--sans);font-size:12.5px;font-weight:600;color:var(--muted)}
.bk-rows{margin-top:12px}
.bk-rows li span{min-width:0;flex:1 1 auto}
.bk-rows li span em{display:block;margin-top:2px;font-size:11.5px;color:var(--muted);opacity:1;max-width:100%;overflow-wrap:anywhere}
.bk-rows li b{flex:0 0 auto}
.bk-foot{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:auto;padding-top:12px;border-top:1px solid var(--soft)}
.bk-foot .v2-status{margin-left:auto}
.v2-big.is-empty span{font-size:18px;font-weight:600;color:var(--muted)}
/* 속도계 게이지: 반원 눈금 0~60km/h, 바늘은 값이 바뀔 때 부드럽게 돌아간다(계산형 움직임 R45) */
.bk-gauge{position:relative;margin:10px 0 2px;max-width:320px}
.bk-gauge svg{display:block;width:100%;height:auto;overflow:visible;font-family:var(--sans)}
.bk-gauge .arc{fill:none;stroke:var(--soft);stroke-width:12;stroke-linecap:butt}
.bk-gauge .arc-fill{fill:none;stroke:var(--accent);stroke-width:12;stroke-linecap:butt;transition:stroke-dashoffset .6s cubic-bezier(.3,.7,.3,1)}
.bk-gauge .tick{stroke:var(--line);stroke-width:1.5}
.bk-gauge .tickt{fill:var(--muted);font-size:10.5px;font-variant-numeric:tabular-nums;text-anchor:middle}
.bk-gauge .needle{stroke:var(--ink);stroke-width:2.5;stroke-linecap:round;transform-origin:120px 118px;transition:transform .6s cubic-bezier(.3,.7,.3,1)}
.bk-gauge .hub{fill:var(--ink)}
.bk-gauge .mark{stroke:var(--accent);stroke-width:2;stroke-dasharray:3 3}
.bk-gauge .markt{fill:var(--accent);font-size:10.5px;font-weight:700}
.bk-live{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
/* 파워 구성 막대 */
.bk-barbox{margin-top:14px;padding-top:12px;border-top:1px solid var(--soft)}
.bk-barbox[hidden]{display:none}
.bk-bar{display:flex;height:16px;border-radius:var(--radius);overflow:hidden;background:var(--soft)}
.bk-bar i{display:block;height:100%;min-width:0;transition:width .6s cubic-bezier(.3,.7,.3,1)}
.bk-bar .c-air{background:var(--accent)}
.bk-bar .c-roll{background:color-mix(in srgb, var(--accent) 55%, var(--paper))}
.bk-bar .c-grav{background:var(--ink)}
.bk-bar .c-loss{background:var(--muted)}
.bk-keys{display:flex;flex-wrap:wrap;gap:4px 14px;margin:8px 0 0;padding:0;list-style:none;font-family:var(--sans);font-size:11.5px;color:var(--muted)}
.bk-keys li::before{content:"";display:inline-block;width:10px;height:10px;margin-right:6px;border-radius:2px;vertical-align:-1px;background:var(--accent)}
.bk-keys .k-roll::before{background:color-mix(in srgb, var(--accent) 55%, var(--paper))}
.bk-keys .k-grav::before{background:var(--ink)}
.bk-keys .k-loss::before{background:var(--muted)}
.bk-keys b{color:var(--ink);font-variant-numeric:tabular-nums}
.bk-note{margin:6px 0 0;font-family:var(--sans);font-size:12px;line-height:1.55;color:var(--muted)}
/* 기어·케이던스 */
.bk-gear,.bk-cmp{padding:14px 18px 18px;border-top:1px solid var(--soft)}
.bk-gear>.v2-label,.bk-cmp>.v2-label{display:block;margin-bottom:6px}
.bk-gearintro{margin:0 0 12px}
.bk-gear{container-type:inline-size}
.bk-geargrid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:16px 24px;align-items:start}
@container (max-width:780px){ .bk-geargrid{grid-template-columns:minmax(0,1fr)} } /* 1181~1250px 화면의 좁은 본문: 스프라켓 목록 값이 잘리지 않게 한 열로 */
.bk-gearout{min-width:0}
.bk-gearout .bk-rows{margin-top:0}
.bk-tblabel{display:block;margin:16px 0 8px}
.tbl{overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
.bk-table{width:100%;border-collapse:collapse;font-family:var(--sans);font-size:13px;font-variant-numeric:tabular-nums}
.bk-table th,.bk-table td{padding:7px 8px;border-top:1px solid var(--soft);text-align:left;white-space:nowrap}
.bk-table th{font-size:11.5px;font-weight:700;color:var(--muted);border-top:0}
.bk-table .n{text-align:right}
.bk-table small{font-size:11px;color:var(--muted);font-weight:600}
.bk-table td.is-cur{background:var(--accent);color:var(--on-fill, #fff);font-weight:700}
.bk-table tr.is-cur td{background:var(--accent-wash);color:var(--ink)}
.bk-table tr.is-cur td b{color:var(--accent)}
.bk-table td.heat{background:color-mix(in srgb, var(--accent) calc(var(--h) * 1%), var(--paper))}
.bk-table td.heat.is-cur{background:var(--accent)}
.bk-table th.rowh{color:var(--ink)}
#bkGearTable{width:auto;min-width:min(100%,420px)} /* 체인링 2~3장이면 표가 좁아도 되므로 빈 공간을 남기지 않는다(컴팩트) */
#bkGearTable td,#bkGearTable th{min-width:72px}
#bkGearTable td.n{text-align:center}
@container v2in (max-width:319px){ .bk-hms .v2-input b{min-width:0;padding:0 5px} .bk-hms .v2-input input{padding:0 5px} }
@media (prefers-reduced-motion:reduce){ .bk-gauge .needle,.bk-gauge .arc-fill,.bk-bar i{transition:none} }
@media (max-width:720px){
  .bk-grid{grid-template-columns:minmax(0,1fr)}
  .bk-out{order:-1;border-left:0;border-bottom:1px solid var(--soft)}
  .bk-geargrid{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:420px){
  .bk-in,.bk-out,.bk-gear,.bk-cmp{padding-left:12px;padding-right:12px}
  .bk-fields{grid-template-columns:minmax(0,1fr)}
}