/* 문법: docs/DESIGN.md. 출처는 기계식 적산전력량계(검은 몸체, 흰 명판, 알루미늄 원판, 숫자 바퀴). 이 밖의 hex를 쓰지 않는다. */
:root{
  --body:#1b1c1b; --body-2:#2a2c2a; --line:#454944; --text:#e6e8e3; --sub:#a3a8a2;
  --plate:#e9ebe6; --ink:#121312; --alu:#bcc1c3; --mark:#e2582f;
  --keep:#9ccfa6; --broken:#d8bb6a;
  --shade:rgba(0,0,0,.45);
  --font:"Pretendard","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--body);color:var(--text);font:16px/1.5 var(--font);word-break:keep-all;overflow-wrap:anywhere}
a{color:var(--text)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
button{font:inherit;color:inherit}

/* 머리글 */
.top{max-width:760px;margin:0 auto;padding:14px 16px 4px;display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.top h1{margin:0;font-size:22px;letter-spacing:-.01em}
.lead{margin:2px 0 0;color:var(--sub);font-size:14px}
.fb-open{flex:none;min-height:36px;padding:6px 12px;border:1px solid var(--line);border-radius:4px;background:transparent;cursor:pointer}
.fb-open:hover{border-color:var(--sub)}

.wrap{max-width:760px;margin:0 auto;padding:8px 16px 28px}

/* 입력 */
.calc{margin:0 0 12px}
.seg-row{display:flex;flex-wrap:wrap;gap:8px 12px;margin-bottom:10px}
fieldset{border:0;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.chip{position:relative;display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:4px;padding:6px 10px;cursor:pointer;min-height:40px;color:var(--sub)}
.chip input{position:absolute;opacity:0;pointer-events:none}
.chip svg{width:20px;height:20px}
.chip:has(input:checked){color:var(--text);border-color:var(--text);border-bottom-width:3px}
.chip:has(input:focus-visible){outline:2px solid var(--alu);outline-offset:2px}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;margin:0 0 10px}
.row label{display:inline-flex;align-items:center;gap:6px}
.row .grow{flex:1 1 100%}
.row .grow input{flex:1;min-width:0}
input,select,textarea{font:inherit;border:1px solid var(--line);border-radius:4px;padding:7px 8px;background:var(--body-2);color:var(--text);min-height:40px}
input[type=number]{width:84px}
input:focus-visible,select:focus-visible,textarea:focus-visible,button:focus-visible,summary:focus-visible,a:focus-visible{outline:2px solid var(--alu);outline-offset:2px}
.presets{display:inline-flex;gap:6px}
.presets button,.cands button,.ex,.toggle{border:1px solid var(--line);background:transparent;border-radius:4px;padding:6px 10px;cursor:pointer;min-height:36px}
.presets button:hover,.cands button:hover,.ex:hover,.toggle:hover{border-color:var(--sub)}

/* 툴팁 */
.tip{position:relative;width:24px;height:24px;border-radius:4px;border:1px solid var(--line);background:transparent;color:var(--sub);font:600 13px/1 var(--font);cursor:help;padding:0;flex:none}
.tip:hover::after,.tip:focus::after,.tip.open::after{content:attr(data-tip);position:absolute;z-index:5;left:50%;top:28px;transform:translateX(-50%);width:min(260px,80vw);background:var(--plate);color:var(--ink);font:400 13px/1.45 var(--font);padding:8px 10px;border-radius:4px;text-align:left;border:1px solid var(--line)}
.tips-off .tip:hover::after,.tips-off .tip:focus::after{display:none}

/* 계량기 판 */
.board{background:var(--body-2);border:1px solid var(--line);border-radius:18px;padding:14px 12px 12px;box-shadow:0 8px 24px var(--shade)}
.meters{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.meter{margin:0}
.meter figcaption{font-size:14px;color:var(--sub);margin:0 2px 6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.meter figcaption b{color:var(--text);font-weight:700;margin-right:4px}
.plate{background:var(--plate);color:var(--ink);border-radius:6px;padding:10px 8px 8px;display:grid;gap:8px;justify-items:center}
.reg{display:flex;align-items:center;gap:5px}
.reg .unit{font-size:13px;font-weight:600}
.m-rate{margin:0;font-size:13px;font-variant-numeric:tabular-nums}
.m-kwh{font-weight:700}
.disc{width:100%;max-width:220px;height:auto;display:block}
.disc .slot{fill:var(--ink)}
.disc .rim{fill:var(--line)}
.disc .top{fill:var(--alu)}
.disc .mark{fill:var(--mark)}
.disc .tick{fill:var(--ink)}

/* 숫자 바퀴: 칸마다 0~9 띠를 올려 보인다 */
.drums{display:inline-flex;gap:2px;background:var(--ink);padding:3px;border-radius:4px}
.d{display:block;width:.78em;height:1.3em;overflow:hidden;background:var(--ink);color:var(--text);font-weight:700;font-variant-numeric:tabular-nums;text-align:center;font-size:20px;line-height:1.3em;border-radius:4px}
.d.dec{background:var(--mark);color:var(--ink)}
.d.gap{margin-left:4px}
.d.lead{opacity:.35}
.drums .sep{align-self:flex-end;color:var(--text);font-weight:700;font-size:16px;line-height:1;padding:0 1px 4px}
.drums .sep.lead{opacity:.35}
.strip{display:block;will-change:transform}
.strip i{display:block;font-style:normal;height:1.3em}

/* 달 칸과 조작 */
.months{list-style:none;display:grid;grid-template-columns:repeat(12,1fr);gap:3px;margin:10px 0 10px;padding:0}
.months li{font-size:11px;text-align:center;color:var(--sub);border-top:3px solid var(--line);padding-top:2px}
.months li.on{color:var(--text);border-top-color:var(--alu)}
.controls{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.run{min-height:48px;padding:10px 18px;border:2px solid var(--alu);border-radius:4px;background:transparent;color:var(--text);font-weight:700;font-size:17px;cursor:pointer;display:inline-flex;align-items:center;gap:8px}
.run svg{color:var(--mark)}
.run:hover{background:var(--body-2)}
.run:active,.run.is-running{transform:translateY(2px);background:var(--line)}
.toggle[aria-pressed=true]{border-color:var(--text);color:var(--text)}
.toggle[aria-pressed=false]{color:var(--sub)}
.examples{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.ex{font-size:14px;color:var(--sub)}

/* 결과 */
.result{margin-top:14px;padding:14px 4px 4px;border-top:1px solid var(--line)}
.verdict{margin:0;font-size:26px;animation:show .18s ease-out}
[data-verdict=keep] .verdict{color:var(--keep)}
[data-verdict=when-broken] .verdict{color:var(--broken)}
[data-verdict=replace] .verdict{color:var(--mark)}
@keyframes show{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.vsub{margin:2px 0 12px;color:var(--sub)}
.regs{display:flex;flex-wrap:wrap;gap:12px 24px;margin:0 0 12px}
.r-won{display:grid;grid-template-columns:auto auto;align-items:center;gap:4px 6px}
.r-name{grid-column:1/-1;font-size:13px;color:var(--sub);display:flex;align-items:center;gap:6px}
.r-won .unit{font-size:14px}
.r-plain{font-size:20px}
.r-base{margin:8px 0 0;font-size:13px;color:var(--sub)}
.to-home{margin-left:6px;min-height:28px;padding:2px 10px;border:1px solid var(--line);border-radius:4px;background:transparent;color:var(--text);font-size:13px;cursor:pointer}
.hint{margin:4px 0 0;font-size:13px;color:var(--sub)}
.why summary{cursor:pointer;color:var(--sub);font-size:14px;min-height:28px}
.bars{list-style:none;display:grid;grid-template-columns:repeat(12,1fr);gap:4px;height:72px;margin:10px 0;padding:0;align-items:end}
.bars li{display:flex;flex-direction:column;justify-content:flex-end;height:100%;text-align:center}
.bars span{display:block;height:var(--h);min-height:2px;background:var(--alu);border-radius:4px 4px 0 0}
.bars b{font-weight:400;font-size:11px;color:var(--sub)}
.basis{margin:0;padding:0;list-style:none;font-size:14px}
.basis li{display:grid;grid-template-columns:7.5em 7.5em 1fr;gap:2px 10px;padding:7px 0;border-top:1px solid var(--line)}
.basis li:first-child{border-top:0}
.basis b{font-weight:600}
.basis span{font-weight:700;white-space:nowrap}
.basis small{color:var(--sub);font-size:13px}
.tariff{font-size:13px;color:var(--sub);margin:10px 0 0}
.warn{color:var(--broken);font-weight:600}
.problem{margin:0;color:var(--sub)}
.cands{list-style:none;padding:0;margin:8px 0 0;display:flex;flex-wrap:wrap;gap:6px}
.cands small{display:block;color:var(--sub);font-size:12px}
.exit a{display:inline-block;margin-top:6px;padding:10px 14px;border-radius:4px;border:1px solid var(--text);text-decoration:none}

/* 지난 계산 */
.log{margin-top:14px}
.log h2{font-size:14px;color:var(--sub);font-weight:600;margin:0 0 6px}
.log ul{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.log button{width:100%;display:grid;grid-template-columns:1fr auto auto;gap:10px;align-items:center;text-align:left;border:1px solid var(--line);background:transparent;border-radius:4px;padding:6px 10px;cursor:pointer;min-height:36px;font-size:14px}
.log small{color:var(--sub);font-variant-numeric:tabular-nums}
.log b[data-v=keep]{color:var(--keep)}
.log b[data-v=when-broken]{color:var(--broken)}
.log b[data-v=replace]{color:var(--mark)}

.calc-2{margin-top:16px;padding-top:12px;border-top:1px solid var(--line)}
.more summary{cursor:pointer;color:var(--sub);font-size:14px;margin-bottom:8px;min-height:28px}

/* 실황(기록이 있을 때만 생김) */
.live{margin-top:14px;font-size:14px}
.live-head{margin:0 0 6px;color:var(--sub)}
.live-list{list-style:none;margin:0;padding:0}
.live-list li{padding:4px 0;border-top:1px solid var(--line)}
.live-list span{color:var(--sub);display:inline-block;min-width:4.5em}

/* 문서 페이지 */
.doc h2{font-size:18px;margin:22px 0 8px}
.grid{border-collapse:collapse;width:100%;margin:0 0 12px;background:var(--body-2);font-size:14px}
.grid caption{text-align:left;font-weight:600;padding:4px 0}
.grid th,.grid td{border:1px solid var(--line);padding:6px 8px;text-align:left}
.calc .verdict{font-size:24px}

/* 바닥글 */
.foot{max-width:760px;margin:0 auto;padding:8px 16px 32px;font-size:13px;color:var(--sub)}
.foot-links{display:flex;flex-wrap:wrap;gap:4px 14px}
.foot a{color:var(--sub);display:inline-block;min-height:24px;line-height:24px}

/* 의견 창 */
.fb-dlg{border:1px solid var(--line);border-radius:6px;background:var(--body-2);color:var(--text);padding:16px;width:min(460px,calc(100vw - 32px));box-shadow:0 12px 40px var(--shade)}
.fb-dlg::backdrop{background:var(--shade)}
.fb-form{display:grid;gap:10px}
.fb-form h2{margin:0;font-size:18px}
.fb-kind{gap:6px}

.fb-form textarea{width:100%}
.fb-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.fb-send{padding:8px 16px;border-radius:4px;border:1px solid var(--text);background:transparent;cursor:pointer;min-height:40px}
.fb-close{padding:8px 14px;border-radius:4px;border:1px solid var(--line);background:transparent;cursor:pointer;min-height:40px}
.fb-msg{font-size:14px;color:var(--sub)}
.hp{position:absolute;left:-9999px;width:1px;height:1px}

@media (min-width:900px){
  .top,.wrap,.foot{max-width:1040px}
  .stage{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);grid-template-rows:auto 1fr;column-gap:24px;align-items:start}
  .board{grid-row:1/3}
  .result{margin-top:0;border-top:0;padding-top:4px}
  .calc-2{max-width:620px}
}
@media (max-width:420px){
  .top h1{font-size:20px}
  .d{font-size:17px}
  .basis li{grid-template-columns:auto 1fr}.basis small{grid-column:1/-1}
}
@media (prefers-reduced-motion:reduce){.verdict{animation:none}}