/* 여는 이야기(opening.js): 머리줄 아래를 덮는 전체 화면. 휴대폰에서는 화면 전체 */
#op { position: fixed; left: 0; right: 0; top: 58px; bottom: 0; z-index: 35; display: flex; flex-direction: column; background: var(--bg); color: var(--ink); }
#op[hidden] { display: none; }
body.op-open { overflow: hidden; }
body.op-open #tip, body.op-open #map .ftcard { display: none; }

/* 차례 줄 */
.op-bar { display: flex; align-items: center; gap: 10px; padding: 8px 16px; border-bottom: 1px solid var(--line); background: var(--bg); }
.op-tabs { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; flex: 1; min-width: 0; }
.op-tabs::-webkit-scrollbar { display: none; }
.op-tabs button { flex: none; border: 1.5px solid var(--line); background: var(--card); color: var(--ink2); border-radius: 999px; padding: 5px 14px; font-size: 14px; white-space: nowrap; }
.op-tabs button b { color: var(--accent); margin-right: 2px; }
.op-tabs button.on { background: var(--hub); border-color: var(--hub); color: var(--bg); font-weight: 700; }
.op-tabs button.on b { color: color-mix(in srgb, var(--accent) 55%, var(--bg)); }
.op-x { flex: none; border: 1.5px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px; padding: 5px 14px; font-size: 14px; font-weight: 700; white-space: nowrap; }
.op-x:hover, .op-tabs button:hover { border-color: var(--ink2); }

/* 장 안의 장면 줄: 시간 여행은 연표처럼 */
.op-ribbon { display: flex; gap: 4px; padding: 8px 16px; overflow-x: auto; scrollbar-width: none; border-bottom: 1px solid var(--line); background: var(--bg2); }
.op-ribbon::-webkit-scrollbar { display: none; }
.op-ribbon button { flex: none; border: 0; background: transparent; color: var(--ink2); border-radius: 999px; padding: 3px 12px; font-size: 14px; font-weight: 650; font-variant-numeric: tabular-nums; }
.op-ribbon.years { gap: 0; justify-content: space-between; position: relative; }
.op-ribbon.years button { position: relative; padding: 16px 6px 2px; flex: 1 0 auto; }
.op-ribbon.years button::before { content: ''; position: absolute; left: 0; right: 0; top: 7px; height: 2px; background: var(--line); }
.op-ribbon.years button::after { content: ''; position: absolute; left: 50%; top: 3px; width: 10px; height: 10px; margin-left: -5px; border-radius: 50%; background: var(--card); border: 2px solid var(--line); }
.op-ribbon.years button.past::before, .op-ribbon.years button.on::before { background: var(--accent); }
.op-ribbon.years button.past::after { background: var(--accent); border-color: var(--accent); }
.op-ribbon.years button.on::after { width: 14px; height: 14px; margin-left: -7px; top: 1px; background: var(--card); border: 4px solid var(--accent); }
.op-ribbon button.on { color: var(--ink); }
.op-ribbon:not(.years) button.on { background: var(--hub); color: var(--bg); }

/* 무대 */
.op-stage { flex: 1; min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: clamp(16px, 2.6vw, 40px) clamp(16px, 3.4vw, 56px) 28px; }
.op-stage.op-in > * { animation: op-in .55s cubic-bezier(.22, .8, .2, 1) both; }
@keyframes op-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
body.calm .op-stage.op-in > * { animation: none; }
.op-stage p { word-break: keep-all; }

.op-k { margin: 0; font-size: 14px; font-weight: 800; color: var(--accent); }
.op-ch { margin: 0 0 6px; font-size: 14px; font-weight: 800; color: var(--accent); }
.op-title { margin: 6px 0 10px; font-size: clamp(30px, 3.6vw, 58px); font-weight: 850; letter-spacing: -.035em; line-height: 1.22; word-break: keep-all; }
.op-s { margin: 0; font-size: clamp(16px, 1.35vw, 21px); color: var(--ink2); line-height: 1.6; }

/* 장면: 왼쪽 그림, 오른쪽 글 */
.op-scene { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(320px, 1fr); gap: clamp(20px, 2.6vw, 44px); align-items: start; max-width: 1560px; margin: 0 auto; }
.op-scene.no-vis { grid-template-columns: minmax(0, 880px); justify-content: center; }
.op-scene.is-chart { grid-template-columns: minmax(0, 1fr) minmax(320px, 1fr); }
.op-vis { position: sticky; top: 0; display: flex; flex-direction: column; gap: 14px; }
.op-fig { margin: 0; }
.op-main-img { display: block; width: 100%; padding: 0; border: 0; background: var(--card); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); cursor: pointer; }
.op-main-img img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: contain; background: var(--card); }
.op-thumbs { display: flex; gap: 8px; margin-top: 10px; }
.op-thumbs button { width: 132px; padding: 0; border: 2px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--card); opacity: .7; }
.op-thumbs button.on { border-color: var(--accent); opacity: 1; }
.op-thumbs img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.op-ph { display: grid; place-content: center; gap: 8px; aspect-ratio: 16 / 9; padding: 20px; border-radius: 16px; border: 1.5px dashed var(--line); background: var(--bg2); text-align: center; }
.op-ph p { margin: 0; font-size: clamp(17px, 1.5vw, 22px); font-weight: 750; line-height: 1.5; }
.op-ph small { color: var(--ink2); font-size: 13.5px; }

/* 그림 전체 화면(#op-full): body 바로 아래, 브라우저 전체 화면. 그림은 잘리지 않게 화면 안에 다 들어간다 */
.op-fullhint { position: absolute; left: 12px; bottom: 10px; padding: 2px 10px; border-radius: 999px; background: rgba(20, 24, 32, .62); color: #fff; font-size: 13px; font-weight: 700; opacity: 0; transition: opacity .2s; }
.op-main-img:hover .op-fullhint, .op-main-img:focus-visible .op-fullhint { opacity: 1; }
.op-main-img.is-play .op-fullhint { display: none; }
#op-full { position: fixed; inset: 0; z-index: 90; background: #000; display: grid; place-items: center; cursor: pointer; }
#op-full img { display: block; width: 100vw; height: 100vh; object-fit: contain; }
#op-full .of-prev, #op-full .of-next { position: absolute; top: 50%; transform: translateY(-50%); width: 56px; height: 56px; border-radius: 50%; border: 0; background: rgba(255, 255, 255, .16); color: #fff; font-size: 34px; line-height: 1; display: grid; place-items: center; cursor: pointer; }
#op-full .of-prev { left: 16px; } #op-full .of-next { right: 16px; }
#op-full .of-prev:hover, #op-full .of-next:hover { background: rgba(255, 255, 255, .3); }
#op-full .of-bar { position: absolute; left: 0; right: 0; bottom: 0; display: flex; align-items: center; gap: 12px; padding: 10px 18px 12px; background: linear-gradient(transparent, rgba(0, 0, 0, .7)); color: #fff; font-size: 14px; }
#op-full .of-cap { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#op-full .of-count { font-variant-numeric: tabular-nums; opacity: .85; white-space: nowrap; }
#op-full .of-links { display: flex; gap: 6px; flex: none; }
#op-full .of-links:empty { display: none; }
#op-full .of-links a { border: 1px solid rgba(255, 255, 255, .5); background: rgba(0, 0, 0, .35); color: #fff; border-radius: 999px; padding: 4px 12px; font-size: 13.5px; font-weight: 700; text-decoration: none; white-space: nowrap; }
#op-full .of-links a:hover { background: rgba(255, 255, 255, .18); }
#op-full .of-bar button { border: 1px solid rgba(255, 255, 255, .5); background: rgba(0, 0, 0, .35); color: #fff; border-radius: 999px; padding: 4px 14px; font-size: 14px; font-weight: 700; cursor: pointer; }
#op-full .of-play { background: #d7263d !important; border-color: #d7263d !important; }
#op-full .of-prev, #op-full .of-next, #op-full .of-bar { transition: opacity .4s; }
#op-full.idle { cursor: none; }
#op-full.idle .of-prev, #op-full.idle .of-next, #op-full.idle .of-bar { opacity: 0; }

.op-y { margin: 0 0 4px; font-size: clamp(60px, 7.4vw, 124px); font-weight: 900; line-height: .95; letter-spacing: -.05em; color: var(--accent); font-variant-numeric: tabular-nums; }
.op-h2 { margin: 2px 0 8px; font-size: clamp(24px, 2.3vw, 38px); font-weight: 850; line-height: 1.3; letter-spacing: -.03em; word-break: keep-all; }
.op-yn { display: inline-grid; place-items: center; min-width: 1.5em; height: 1.5em; padding: 0 .35em; margin-right: .35em; border-radius: 999px; background: var(--hub); color: var(--bg); font-size: .72em; vertical-align: .12em; }
.op-line { margin: 12px 0 16px; padding: 2px 0 2px 16px; border-left: 5px solid var(--accent); font-size: clamp(20px, 1.85vw, 30px); font-weight: 800; line-height: 1.45; letter-spacing: -.02em; word-break: keep-all; }
.op-line cite { display: block; margin-top: 6px; font-size: 14px; font-style: normal; font-weight: 600; color: var(--ink2); letter-spacing: 0; }
.op-p p { margin: 0 0 12px; font-size: clamp(16.5px, 1.25vw, 20px); line-height: 1.8; }
.op-p.big p { font-size: clamp(18px, 1.55vw, 24px); }
.op-note { margin: 12px 0 0; font-size: 13.5px; line-height: 1.6; color: var(--ink2); }
.op-media { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; margin-top: 14px; }
.op-media .mtile { background: var(--card); }

/* 영상이 걸린 그림: 가운데 재생 표시 */
.op-main-img { position: relative; }
.op-playmark { display: none; }
.op-main-img.is-play { cursor: pointer; }
.op-main-img.is-play .op-playmark { display: block; position: absolute; left: 50%; top: 50%; width: 76px; height: 76px; margin: -38px 0 0 -38px; border-radius: 50%; background: rgba(215, 38, 61, .92); box-shadow: 0 6px 20px rgba(0, 0, 0, .3); }
.op-main-img.is-play .op-playmark::after { content: ''; position: absolute; left: 30px; top: 22px; border-left: 26px solid #fff; border-top: 16px solid transparent; border-bottom: 16px solid transparent; }

/* 강의 자료 쪽 넘기기 */
.op-main-wrap { position: relative; }
.op-fprev, .op-fnext { position: absolute; top: 50%; transform: translateY(-50%); width: 44px; height: 44px; border-radius: 50%; border: 0; background: rgba(20, 24, 32, .62); color: #fff; font-size: 26px; line-height: 1; display: grid; place-items: center; }
.op-fprev { left: 10px; } .op-fnext { right: 10px; }
.op-fprev:hover, .op-fnext:hover { background: rgba(20, 24, 32, .85); }
.op-fcount { position: absolute; right: 12px; bottom: 10px; padding: 1px 10px; border-radius: 999px; background: rgba(20, 24, 32, .62); color: #fff; font-size: 13px; font-variant-numeric: tabular-nums; }
.op-cap { margin: 8px 2px 0; font-size: 14px; color: var(--ink2); line-height: 1.5; word-break: keep-all; }
.op-fig.deck .op-thumbs { overflow-x: auto; padding-bottom: 4px; scrollbar-width: thin; }
.op-fig.deck .op-thumbs button { flex: none; width: 104px; }

/* 한 줄 링크 */
.op-links { display: flex; flex-direction: column; gap: 6px; margin-top: 12px; }
.op-link { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; padding: 8px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: var(--ink); text-decoration: none; font-size: 15px; line-height: 1.4; }
.op-link:hover { border-color: var(--ink2); }
.op-link span { flex: 1; min-width: 0; word-break: keep-all; }
.op-link em { font-style: normal; color: var(--ink2); }
.ol-k { flex: none; font-style: normal; font-size: 12px; font-weight: 800; padding: 1px 8px; border-radius: 999px; background: var(--bg2); color: var(--ink2); }
.ol-yt, .ol-list, .ol-mp4 { background: color-mix(in srgb, var(--accent) 14%, var(--card)); color: var(--accent); }
.ol-padlet { background: color-mix(in srgb, #8e44ad 14%, var(--card)); color: #8e44ad; }
.ol-blog { background: color-mix(in srgb, var(--ok) 15%, var(--card)); color: var(--ok); }

/* 그해 세상은 */
.op-ctx { margin: 6px 0 4px; padding: 12px 16px; border-radius: 14px; background: color-mix(in srgb, var(--hub2) 8%, var(--card)); border: 1px solid color-mix(in srgb, var(--hub2) 30%, var(--line)); }
.op-ctx-h { margin: 0 0 6px; font-size: 13px; font-weight: 800; color: var(--hub2); }
.op-ctx ul { margin: 0; padding-left: 18px; }
.op-ctx li { margin: 3px 0; font-size: clamp(14.5px, 1.05vw, 17px); line-height: 1.6; word-break: keep-all; }
.op-ctx a, .op-ctx small { font-size: 12.5px; color: var(--ink2); }

/* 장면 맨 끝 「선생님 생각」 */
.op-ask { margin-top: 18px; padding: 14px 16px 6px; border-radius: 16px; background: color-mix(in srgb, var(--accent) 6%, var(--card)); border: 1.5px solid color-mix(in srgb, var(--accent) 35%, var(--line)); }
.op-ask-h { margin: 0 0 8px; font-size: 13px; font-weight: 800; color: var(--accent); }
.op-ask .qcard { background: var(--card); }
.op-ask .op-wall { padding: 0 0 8px; border: 0; background: transparent; }
.op-ask .wall-p { margin: 0 0 8px; font-size: clamp(16px, 1.2vw, 19px); font-weight: 750; line-height: 1.45; word-break: keep-all; }
.op-ask .wall-l { max-height: 220px; overflow-y: auto; }

/* 1장 그해로 돌아가기 */
.op-back { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 10px 0 0; font-size: 13.5px; color: var(--ink2); }
.op-back button { border: 1.5px solid color-mix(in srgb, var(--accent) 45%, var(--line)); background: var(--card); color: var(--accent); border-radius: 999px; padding: 3px 12px; font-size: 13.5px; font-weight: 700; }
.op-back button:hover { background: var(--accent); color: #fff; }

/* QR 크게 보기 */
.op-join .op-qr { border: 0; cursor: zoom-in; }
.op-join .op-qr-big { grid-column: 2; justify-self: start; margin-top: 8px; font-size: 13.5px; padding: 5px 14px; }

/* 막대 그래프 */
.op-chart { margin: 0; padding: 18px 20px 14px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow); }
.op-chart + .op-chart { margin-top: 0; }
.op-chart figcaption { font-size: clamp(16px, 1.3vw, 20px); font-weight: 800; margin-bottom: 12px; }
.oc-row { display: grid; grid-template-columns: 7.2em minmax(0, 1fr) 9.5em; gap: 12px; align-items: center; margin: 10px 0; font-size: clamp(14.5px, 1.1vw, 17px); }
.oc-l { font-weight: 700; }
.oc-bar { height: 26px; border-radius: 8px; background: var(--bg2); overflow: hidden; }
.oc-bar i { display: block; height: 100%; border-radius: 8px; background: var(--hub2); animation: oc-grow 1.1s .2s cubic-bezier(.22, .8, .2, 1) both; transform-origin: left; }
.oc-row.hi .oc-bar i { background: var(--accent); }
@keyframes oc-grow { from { transform: scaleX(0); } to { transform: none; } }
body.calm .oc-bar i { animation: none; }
.oc-v { text-align: right; font-weight: 800; font-variant-numeric: tabular-nums; white-space: nowrap; }
.oc-v small { margin-left: 2px; font-size: .78em; font-weight: 600; color: var(--ink2); }
.oc-v b { display: inline-block; margin-left: 8px; padding: 0 8px; border-radius: 999px; background: color-mix(in srgb, var(--accent) 14%, var(--card)); color: var(--accent); font-size: .9em; }
.oc-row:not(.hi) .oc-v b { background: var(--bg2); color: var(--ink2); }
.oc-src { margin: 8px 0 0; font-size: 12.5px; color: var(--ink2); }
.op-txt .op-chart { margin-top: 14px; }

/* 표지 */
.op-cover { max-width: 1180px; margin: 0 auto; }
.op-cov-row { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(260px, 1fr); gap: 18px; margin-top: 22px; align-items: start; }
.op-q .qcard { margin: 0; background: var(--card); }
.op-join { display: grid; grid-template-columns: 132px minmax(0, 1fr); grid-template-rows: auto auto 1fr; column-gap: 14px; padding: 14px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); }
.op-join .qr { grid-row: 1 / 5; background: #fff; padding: 6px; border-radius: 10px; }
.op-join .qr svg { display: block; width: 100%; height: auto; }
.op-join p { margin: 0; }
.op-join .join-t { font-weight: 800; font-size: 16px; line-height: 1.4; }
.op-acts { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.op-acts .btn { font-size: 17px; padding: 11px 24px; }
.op-toc { list-style: none; margin: 26px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.op-toc button { width: 100%; height: 100%; text-align: left; border: 1.5px solid var(--line); background: var(--card); color: var(--ink); border-radius: 14px; padding: 12px 14px; display: flex; flex-direction: column; gap: 2px; }
.op-toc button:hover { border-color: var(--ink2); }
.op-toc b { color: var(--accent); font-size: 13px; }
.op-toc span { font-weight: 800; font-size: 16px; line-height: 1.35; word-break: keep-all; }
.op-toc small { color: var(--ink2); font-size: 13px; line-height: 1.45; word-break: keep-all; }

/* 함께 고민해 봐요 */
.op-tog { max-width: 1120px; margin: 0 auto; }
.op-tog .op-title { margin-bottom: 18px; }
.op-bridge { margin: 6px 0 0; padding: 14px 18px; border-radius: 14px; background: var(--bg2); font-size: clamp(15px, 1.15vw, 18px); line-height: 1.7; color: var(--ink2); }
.op-tog-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; margin-top: 20px; align-items: start; }
.op-wall { padding: 14px 16px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); }
.op-wall h3 { margin: 0 0 4px; font-size: 14px; color: var(--ink2); }
.op-wall .wall-p { margin: 0 0 8px; font-weight: 700; }
.op-wall .wall-l { max-height: 260px; overflow-y: auto; }

/* 넘기기 */
.op-nav { display: flex; align-items: center; justify-content: center; gap: 16px; padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); background: var(--bg); }
.op-nav button { border: 1.5px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px; padding: 7px 22px; font-size: 15px; font-weight: 700; }
.op-nav .op-next { background: var(--hub); border-color: var(--hub); color: var(--bg); }
.op-nav button:disabled { opacity: .35; }
.op-count { font-size: 14px; color: var(--ink2); font-variant-numeric: tabular-nums; min-width: 4.5em; text-align: center; }

body.big .op-p p { font-size: clamp(19px, 1.5vw, 23px); }
body.big .op-line { font-size: clamp(22px, 2.1vw, 33px); }

/* 휴대폰 */
@media (max-width: 760px), (max-height: 500px) and (max-width: 959px) and (pointer: coarse) {
  #op { top: 0; z-index: 45; }
  .op-bar { padding: 8px 10px; }
  .op-tabs button { padding: 4px 11px; font-size: 13px; }
  .op-tabs button:not(.on) span, .op-tabs button:not(.on) { font-size: 13px; }
  .op-x { padding: 4px 11px; font-size: 13px; }
  .op-ribbon { padding: 6px 10px; }
  .op-ribbon.years button { flex: none; padding: 16px 9px 2px; font-size: 13px; }
  .op-stage { padding: 16px 16px 24px; }
  .op-scene, .op-scene.is-chart { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .op-vis { position: static; }
  .op-thumbs button { width: 96px; }
  .op-y { font-size: 64px; }
  .op-cov-row, .op-tog-row { grid-template-columns: minmax(0, 1fr); }
  .op-join { grid-template-columns: 96px minmax(0, 1fr); }
  .op-toc { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .oc-row { grid-template-columns: 5.6em minmax(0, 1fr); }
  .oc-v { grid-column: 1 / -1; text-align: left; margin-top: -6px; }
  .op-nav { gap: 10px; }
  .op-nav button { padding: 7px 16px; }
}
@media (min-width: 761px) and (max-width: 1100px) {
  .op-scene { grid-template-columns: minmax(0, 1.15fr) minmax(300px, 1fr); }
  .op-toc { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* 「지식 지도로」: 닫기(✕)로 읽히지 않게 지도 그림과 화살표를 단 채운 단추 (2026-10-23) */
.op-x { display: inline-flex; align-items: center; gap: 6px; background: var(--hub); border-color: var(--hub); color: var(--bg); padding: 6px 16px 6px 12px; }
.op-x svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.op-x svg circle:first-child { fill: currentColor; }
.op-x:hover { border-color: var(--hub); filter: brightness(1.15); }
/* 원본 슬라이드 줄: 그림 아래. 모두에게 공유본 PDF, 발표자에게 원본 PPT 전체와 캔바 */
.op-deck { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; margin: 2px 0 6px; padding: 5px 10px; border-radius: 10px; background: var(--bg2); width: fit-content; max-width: 100%; font-size: 13px; color: var(--ink2); line-height: 1.6; }
.op-deck .od-k { font-weight: 800; color: var(--ink2); }
.op-deck .od-d { display: inline-flex; flex-wrap: wrap; align-items: baseline; gap: 2px 8px; }
.op-deck .od-d b { font-weight: 700; color: var(--ink); }
.op-deck a { color: var(--accent); font-weight: 700; text-decoration: none; white-space: nowrap; }
.op-deck a:hover { text-decoration: underline; }
.op-deck .od-p { color: var(--hub2); margin-right: 8px; }
.op-deck-cov { margin-top: 14px; }
#op-full { touch-action: pan-y; }