/* 설명 페이지 공용 스타일. calc.css 다음에 읽는다. 종이 느낌, 진한 초록 한 가지. */
body{ max-width:720px; padding-top:0; }

/* 상단 줄: 이름은 왼쪽, 메뉴는 가로 스크롤 */
.top{ position:sticky; top:0; z-index:5; display:flex; align-items:center; gap:22px; margin:0 -22px 36px; padding:0 22px;
  height:52px; background:rgba(250,249,245,.88); backdrop-filter:saturate(1.4) blur(10px); -webkit-backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid var(--line); }
.brand{ flex:none; font-size:15px; font-weight:700; letter-spacing:-.02em; color:var(--green); text-decoration:none; }
.menu{ display:flex; flex:1; min-width:0; flex-wrap:nowrap; gap:2px; overflow-x:auto; scrollbar-width:none; margin:0; padding:0; border:0; }
.menu::-webkit-scrollbar{ display:none; }
.menu a{ flex:none; margin:0; padding:6px 10px; border:0; border-radius:4px; font-size:13.5px; font-weight:500; color:var(--sub); text-decoration:none; }
.menu a:hover{ color:var(--ink); background:rgba(27,30,25,.05); text-decoration:none; }
.menu a[aria-current="page"]{ color:var(--green); background:var(--green-soft); font-weight:600; }

/* 본문 */
.doc h1{ margin-top:8px; }
.lede{ font-size:17px; line-height:1.75; color:var(--sub); max-width:33em; margin:0 0 6px; }
.doc h2{ margin:46px 0 12px; padding-top:20px; border-top:2px solid var(--ink); font-size:19px; font-weight:700; letter-spacing:-.025em; line-height:1.35; }
.doc h3{ margin:26px 0 4px; font-size:16px; font-weight:700; letter-spacing:-.015em; }
.doc p{ margin:0 0 14px; font-size:16px; line-height:1.85; max-width:38em; word-break:keep-all; overflow-wrap:break-word; }
.doc a{ color:var(--green); text-underline-offset:3px; text-decoration-thickness:1px; }
.doc a:hover{ text-decoration-thickness:2px; }
.doc b{ font-weight:700; }

/* 점 목록 */
.plain{ margin:0 0 16px; padding-left:1.2em; font-size:16px; line-height:1.8; }
.plain li{ margin:2px 0; word-break:keep-all; }

/* 수식 */
.formula{ margin:20px 0 22px; padding:14px 18px; background:var(--green-soft); border-left:4px solid var(--green);
  font-size:15.5px !important; font-weight:600; line-height:1.7 !important; font-variant-numeric:tabular-nums; }

/* 단계 목록 */
.steps{ list-style:none; counter-reset:s; margin:0 0 16px; padding:0; }
.steps li{ counter-increment:s; position:relative; margin:0; padding:14px 0 14px 46px; border-top:1px solid var(--line); font-size:16px; line-height:1.8; word-break:keep-all; }
.steps li:last-child{ border-bottom:1px solid var(--line); }
.steps li::before{ content:counter(s); position:absolute; left:0; top:12px; width:30px; height:30px; display:grid; place-items:center;
  font-size:14px; font-weight:700; color:#fff; background:var(--green); border-radius:50%; font-variant-numeric:tabular-nums; }

/* 표 */
.tbl{ margin:18px 0 22px; overflow-x:auto; -webkit-overflow-scrolling:touch; }
table{ width:100%; border-collapse:collapse; font-size:14.5px; font-variant-numeric:tabular-nums; }
caption{ text-align:left; padding:0 0 8px; font-size:13px; font-weight:700; letter-spacing:.04em; color:var(--sub); }
th{ text-align:left; padding:9px 12px 9px 0; font-size:12.5px; font-weight:700; letter-spacing:.03em; color:var(--sub); border-bottom:2px solid var(--ink); white-space:nowrap; }
td{ padding:10px 12px 10px 0; border-bottom:1px solid var(--line); vertical-align:top; line-height:1.55; }
td:last-child, th:last-child{ padding-right:0; }
/* 숫자 표: 줄바꿈 없이 가로로 스크롤, 첫 열만 줄바꿈 */
.nw th, .nw td{ white-space:nowrap; }
.nw td:first-child, .nw th:first-child{ white-space:normal; min-width:9em; }
tbody tr:last-child td{ border-bottom-color:var(--ink); }

/* 자주 묻는 질문 */
.faq details{ border-top:1px solid var(--line); }
.faq details:last-child{ border-bottom:1px solid var(--line); }
.faq summary{ position:relative; padding:17px 34px 17px 0; font-size:16.5px; font-weight:600; letter-spacing:-.015em; line-height:1.5; cursor:pointer; list-style:none; word-break:keep-all; }
.faq summary::-webkit-details-marker{ display:none; }
.faq summary::after{ content:"+"; position:absolute; right:4px; top:14px; font-size:22px; font-weight:400; color:var(--sub); transition:transform .15s; }
.faq details[open] summary::after{ transform:rotate(45deg); color:var(--green); }
.faq summary:hover{ color:var(--green); }
.faq summary:focus-visible{ outline:3px solid rgba(20,83,45,.35); outline-offset:2px; }
.faq details p{ margin:0 0 18px; padding-right:34px; color:var(--ink); }

/* 확인한 자료 */
.src{ margin:52px 0 0; padding:16px 18px; background:#fff; border:1px solid var(--line); }
.doc .src h2{ margin:0 0 8px; padding:0; border:0; font-size:12.5px; font-weight:700; letter-spacing:.08em; color:var(--sub); }
.src ul{ margin:0 0 8px; padding-left:1.1em; font-size:14.5px; }
.src li{ margin:3px 0; }
.doc .src p{ margin:0; font-size:13px; line-height:1.6; color:var(--sub); }

/* 홈의 안내 구역 */
.guide{ margin-top:34px; }
.guide h2{ margin-top:0; }
.links{ list-style:none; margin:16px 0 0; padding:0; border-top:1px solid var(--line); }
.links li{ display:grid; grid-template-columns:7.5em 1fr; gap:14px; align-items:baseline; padding:12px 0; border-bottom:1px solid var(--line); font-size:15px; }
.links a{ font-weight:600; text-decoration:none; }
.links a:hover{ text-decoration:underline; }
.links span{ color:var(--sub); font-size:14px; }
@media (max-width:520px){ .links li{ grid-template-columns:1fr; gap:2px; } }

/* 하단 */
.foot{ display:flex; flex-wrap:wrap; gap:6px 18px; margin-top:56px; padding-top:16px; border-top:1px solid var(--line); font-size:13px; color:#8e8a79; }
.foot a{ color:var(--sub); text-decoration:none; }
.foot a:hover{ color:var(--green); text-decoration:underline; }
@media (max-width:820px){ .top{ padding-right:116px; } }
@media (max-width:520px){ .top{ gap:12px; } .doc h1{ font-size:26px; } }