/* ───────── 화면 + A4 인쇄 ───────── */
:root {
  --ink: #1b1d22;
  --muted: #6b7079;
  --line: #d9dce1;
  --accent: #1f5fbf;
  --panel: #f6f7f9;
  --desk: #e9ebee;
  --sans: "Noto Sans KR", "Noto Sans CJK KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --math: "Times New Roman", "STIX Two Text", "Nimbus Roman", "Liberation Serif", serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--desk);
  display: flex;
  align-items: flex-start;
  min-height: 100vh;
}

/* ───────── 왼쪽 설정 패널 ───────── */
.panel {
  position: sticky; top: 0;
  width: 270px; flex: none;
  height: 100vh; overflow-y: auto;
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 20px 18px 28px;
  font-size: 14px;
}
.panel h1 { font-size: 18px; margin: 0; letter-spacing: -0.02em; }
.panel .sub { margin: 2px 0 18px; color: var(--muted); font-size: 13px; }
.field { display: block; margin-bottom: 12px; font-size: 12.5px; color: var(--muted); }
.field input {
  display: block; width: 100%; margin-top: 4px;
  font: inherit; font-size: 14px; color: var(--ink);
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff;
}
fieldset { border: 0; padding: 0; margin: 0 0 14px; }
legend { font-size: 12.5px; color: var(--muted); margin-bottom: 6px; padding: 0; }
.check { display: flex; gap: 8px; align-items: center; padding: 4px 0; cursor: pointer; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }
/* 단원: 체크박스(전체 선택) + 이름 버튼(펼치기) */
.ugroup { border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.ugroup + .ugroup { margin-top: 6px; }
.unit-row { display: flex; align-items: center; gap: 8px; padding: 0 4px 0 10px; }
.unit-row input { width: 16px; height: 16px; accent-color: var(--accent); flex: none; }
.unit-toggle {
  flex: 1; display: flex; align-items: center; gap: 6px;
  width: auto; margin: 0; padding: 9px 6px; border: 0; background: none;
  font-weight: 700; text-align: left; color: var(--ink);
}
.unit-toggle:hover { filter: none; background: var(--panel); border-radius: 6px; }
.unit-name { flex: 1; }
.unit-count { font-weight: 400; font-size: 12px; color: var(--muted); }
.chev { color: var(--muted); transition: transform .15s; font-size: 12px; }
.unit-toggle[aria-expanded="true"] .chev { transform: rotate(90deg); }
.unit-body { padding: 0 10px 8px; border-top: 1px solid var(--line); }
.check.subc { padding: 5px 0 5px 4px; font-size: 13.5px; }
.seg { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: #fff; }
.seg label { flex: 1; text-align: center; cursor: pointer; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span { display: block; padding: 7px 0; font-size: 13.5px; }
.seg label + label span { border-left: 1px solid var(--line); }
.seg input:checked + span { background: var(--accent); color: #fff; }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: -2px; }
button {
  font: inherit; font-size: 14px; cursor: pointer;
  width: 100%; padding: 10px; margin: 4px 0 16px;
  border-radius: 8px; border: 1px solid var(--line); background: #fff; color: var(--ink);
}
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 700; }
button:hover { filter: brightness(0.97); }
.hint { font-size: 12px; color: var(--muted); line-height: 1.55; margin: 0 0 10px; }

/* ───────── A4 페이지 ───────── */
#sheets { flex: 1; padding: 24px; display: flex; flex-direction: column; align-items: center; gap: 20px; overflow-x: auto; }
.page {
  width: 210mm; height: 297mm; flex: none;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,.12), 0 6px 20px rgba(0,0,0,.06);
  padding: 13mm 13mm 10mm;
  display: flex; flex-direction: column;
  position: relative; overflow: hidden;
  font-size: 10.5pt; line-height: 1.6;
}
body.view-q .page-a, body.view-a .page-q { display: none; }

.ph { border-bottom: 2px solid var(--ink); padding-bottom: 3mm; margin-bottom: 4mm; }
.ph-title-big { font-size: 17pt; font-weight: 700; letter-spacing: -0.03em; }
.ph-meta { display: flex; gap: 8mm; margin-top: 2mm; font-size: 10pt; color: #333; }
.ph-meta .blank { display: inline-block; min-width: 32mm; height: 1.2em; vertical-align: -0.2em; border-bottom: 1px solid #999; font-weight: 500; padding: 0 1mm; margin-left: 1mm; }
.ph-small { display: flex; justify-content: space-between; font-size: 9.5pt; border-bottom-width: 1px; padding-bottom: 2mm; }
.ph-small .ph-title { font-weight: 700; }
.pf { margin-top: auto; text-align: center; font-size: 8.5pt; color: var(--muted); padding-top: 2mm; }

/* 문제지: 2열 × 3행 */
.grid-q {
  flex: 1; min-height: 0;
  display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: repeat(3, 1fr);
}
.q { position: relative; padding: 3mm 4mm 2mm 0; border-bottom: 1px dashed var(--line); overflow: hidden; }
.q:nth-child(odd) { border-right: 1px solid var(--line); }
.q:nth-child(even) { padding-left: 4mm; }
.q-head { display: flex; align-items: center; gap: 2mm; margin-bottom: 1mm; }
.num {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 6.2mm; height: 6.2mm; padding: 0 1mm;
  border-radius: 3.1mm; background: var(--ink); color: #fff;
  font-size: 9pt; font-weight: 700;
}
.tag { font-size: 7.5pt; color: var(--accent); border: 1px solid currentColor; border-radius: 2mm; padding: 0 1.5mm; line-height: 1.5; }
.q-text { word-break: keep-all; }
.fig { margin-top: 2mm; text-align: center; }
.fig svg { width: 58mm; height: auto; }
/* 문항 위 도구: 유형 이름 + 숫자만 / 다른 유형 (마우스를 올리면 보임) */
.q-tools {
  position: absolute; top: 2mm; right: 2mm; display: flex; gap: 4px; align-items: center;
  opacity: 0; transition: opacity .15s; background: rgba(255,255,255,.95); padding: 2px; border-radius: 8px;
}
.q:hover .q-tools, .q-tools:focus-within { opacity: 1; }
.q-type { font-size: 10.5px; color: var(--muted); max-width: 40mm; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; padding: 0 2px; }
.reroll { width: auto; margin: 0; padding: 2px 8px; font-size: 11px; border-radius: 6px; color: var(--ink); }
.reroll:disabled { opacity: .4; cursor: default; }

/* 해답지: 2열 × 5행 */
.grid-a {
  flex: 1; min-height: 0;
  display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: repeat(5, 1fr);
  column-gap: 6mm;
}
.a { padding: 2.5mm 0; border-bottom: 1px dashed var(--line); overflow: hidden; font-size: 9.5pt; line-height: 1.55; }
.a-head { display: flex; align-items: center; gap: 2.5mm; margin-bottom: 1mm; }
.a-ans { font-weight: 700; font-size: 11pt; }
.a-ans .unit { font-weight: 500; font-size: 10pt; }
.a-sol { margin: 0; padding-left: 0; list-style: none; color: #333; word-break: keep-all; }
.a-sol li + li { margin-top: 4px; } /* 분수가 있는 줄끼리 겹치지 않게 */

/* ───────── 도형 ───────── */
.figure .fg-line { fill: none; stroke: var(--ink); stroke-width: 1.3; stroke-linejoin: round; }
.figure .fg-fill { fill: var(--ink); stroke: none; }
.figure .fg-thin { fill: none; stroke: var(--ink); stroke-width: 0.9; }
.figure .fg-dash { stroke: var(--ink); stroke-width: 0.9; stroke-dasharray: 4 3; }
.figure .fg-dot { fill: var(--ink); }
.figure text { font-family: var(--math); font-size: 13px; fill: var(--ink); }
.figure .fg-vertex { font-size: 13.5px; }
.figure .fg-num { font-size: 12.5px; }
.figure .fg-var { font-style: italic; font-size: 14px; }

/* ───────── 수식 (KaTeX) ───────── */
.katex { font-size: 1.1em; }
.a-ans .katex { font-size: 1.15em; }

/* ───────── 인쇄 ───────── */
@page { size: A4; margin: 0; }
@media print {
  body { background: #fff; display: block; }
  .no-print { display: none !important; }
  #sheets { padding: 0; gap: 0; display: block; }
  /* 297mm 그대로 두면 반올림 때문에 빈 쪽이 생기는 브라우저가 있어 살짝 줄인다 */
  .page { box-shadow: none; break-after: page; height: 296mm; }
  .page:last-child { break-after: auto; }
}
@media screen {
  /* 화면이 A4보다 좁으면 미리보기만 줄인다. 배율은 main.ts의 fitSheets가 정한다 (인쇄는 원래 크기) */
  .page { zoom: var(--sheet-zoom, 1); }
}
/* 좁은 화면·터치: 문항을 누르면 그 문항 아래쪽에 다시 뽑기 버튼이 나온다.
   --u 는 화면에서 1px로 보이는 길이 (main.ts의 fitTools가 미리보기 배율·손가락 확대를 되돌려 정한다) */
.only-compact { display: none; }
.compact .only-compact { display: block; }
.compact .q { cursor: pointer; }
.compact .q-tools { display: none; }
.compact .q.q-sel { outline: 4px solid var(--accent); outline-offset: -2px; background: #eef4ff; }
.compact .q.q-sel .q-tools {
  --u: calc(1px * var(--tool-zoom, 1));
  display: flex; opacity: 1; top: auto; left: 2mm; right: 2mm; bottom: 2mm;
  flex-wrap: wrap; gap: calc(5 * var(--u)); padding: calc(5 * var(--u)); border-radius: calc(8 * var(--u));
  background: rgba(255,255,255,.96); box-shadow: 0 calc(2 * var(--u)) calc(8 * var(--u)) rgba(0,0,0,.15);
}
.compact .q.q-sel .q-type {
  flex: 1 0 100%; max-width: none; white-space: normal; overflow: visible;
  font-size: calc(12 * var(--u)); line-height: 1.35; padding: 0 calc(2 * var(--u)); color: var(--ink);
}
.compact .q.q-sel .reroll {
  flex: 1 1 0; min-width: 0; white-space: nowrap;
  font-size: calc(13 * var(--u)); padding: calc(8 * var(--u)) calc(4 * var(--u)); border-radius: calc(6 * var(--u));
}
.tools-narrow .q.q-sel .q-type, .tools-narrow .q.q-sel .ico { display: none; }

@media screen and (max-width: 900px) {
  body { flex-direction: column; align-items: stretch; }
  .panel { position: static; width: 100%; height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  #sheets { padding: 12px; align-items: flex-start; gap: 12px; }
}

/* 수식은 중간에서 줄이 바뀌지 않게 (식 단위로만 줄바꿈) */
.q-text .katex, .a-sol .katex, .a-ans .katex { white-space: nowrap; }
.nb { white-space: nowrap; }
.figure .fg-circle { fill: none; stroke: var(--ink); stroke-width: 1.3; }