/* 授業の板書ショーケース（#lesson-boards）と拡大表示。各ページのインライン <style> の後に読み込むこと（.lsn-media figure が .okk-media figure を上書きするため） */
/* ── 授業の板書（kanri-juku-hikaku / online-katei-kyoshi 共通）: 板書は左3／説明は右2。スマホは「STEP・見出し → 板書 → 説明」の順に縦積み ── */
.lsn{max-width:1000px;margin:56px auto 0}
.lsn-head{max-width:700px;margin:0 auto 36px;text-align:center}
.lsn-chip{display:inline-block;font-size:13px;font-weight:700;color:var(--white);background:var(--primary);border-radius:6px;padding:3px 14px;letter-spacing:.02em;line-height:1.6}
.lsn-title{margin:12px 0;font-family:var(--font-serif);font-size:clamp(20px,2.6vw,25px);font-weight:700;color:var(--primary-dark);line-height:1.5}
.lsn-lead{font-size:15px;color:var(--text-light);line-height:2;text-align:left}
.lsn-hint{display:inline-flex;align-items:center;gap:6px;margin-top:14px;padding:3px 14px 3px 10px;font-size:13px;color:var(--text-light);background:var(--white);border:1px solid var(--green-mist);border-radius:40px;line-height:1.7}
.lsn svg{width:16px;height:16px;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round}
.lsn-hint svg{color:var(--primary)}
/* 段（01・02…）の見出し行。番号の意味は各ページの文脈で決める */
.lsn-phase{display:flex;align-items:center;flex-wrap:wrap;gap:4px 12px;margin:48px 0 18px}
.lsn-head+.lsn-phase{margin-top:0}
.lsn-phase::after{content:'';flex:1;min-width:24px;height:1px;background:linear-gradient(90deg,var(--green-mist),transparent)}
.lsn-phase-num{flex-shrink:0;width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;background:var(--primary);color:var(--white);font-family:var(--font-serif);font-size:14px;font-weight:700}
.lsn-phase--last .lsn-phase-num{background:var(--amber);color:#1a1a1a}
.lsn-phase-name{font-size:17px;font-weight:700;color:var(--primary-dark)}
.lsn-phase-desc{font-size:14px;color:var(--text-light)}
/* STEPカード */
.lsn-steps{display:grid;gap:24px}
.lsn-step{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);grid-template-rows:1fr auto auto 1fr;grid-template-areas:"fig ." "fig head" "fig body" "fig .";background:var(--white);border:1px solid var(--border);border-left:4px solid var(--primary-light);border-radius:16px;overflow:hidden;box-shadow:0 2px 8px rgba(14,74,56,.05)}
.lsn-step-head{grid-area:head;padding:22px 26px 0}
.lsn-step-body{grid-area:body;padding:10px 26px 24px}
.lsn-no{display:flex;align-items:center;gap:8px;margin-bottom:2px;font-family:var(--font-serif);font-size:13.5px;font-weight:700;letter-spacing:.1em;color:var(--primary)}
.lsn-no::before{content:'';width:18px;height:2px;background:var(--gold)}
.lsn-step h4{font-size:17px;font-weight:700;color:var(--primary-dark);line-height:1.55}
.lsn-desc{font-size:14px;color:var(--text-light);line-height:1.95}
.lsn-key{display:inline-block;margin-top:12px;padding:6px 12px;font-size:13.5px;font-weight:700;color:var(--gold-light);background:var(--primary-dark);border-radius:8px;line-height:1.6}
/* 板書（タップで拡大）。拡大の案内は板書の下の「トレイ」に置き、手書きを隠さない */
.lsn-fig{grid-area:fig;display:flex;flex-direction:column;justify-content:center;background:#005429;cursor:zoom-in}
.lsn-fig img{width:100%;height:auto}
.lsn-fig:focus-visible{outline:3px solid var(--gold);outline-offset:-3px}
.lsn-tray{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:7px 14px;background:var(--primary-dark);font-size:12.5px;font-weight:700;letter-spacing:.04em;line-height:1.5;color:rgba(255,255,255,.72)}
.lsn-tray-zoom{display:inline-flex;align-items:center;gap:5px;color:var(--white);transition:color .2s}
.lsn-fig:hover .lsn-tray-zoom{color:var(--gold-light)}
.lsn-takeaway{margin-top:24px;padding:18px 22px;background:var(--green-pale);border:1px solid var(--green-mist);border-left:4px solid var(--gold);border-radius:12px;font-size:14.5px;line-height:2;color:var(--text)}
.lsn-takeaway strong{color:var(--primary-dark)}
.lsn-after{font-size:14.5px;color:var(--text-light);line-height:2}
.lsn-media.okk-media{margin-top:20px}
.lsn-media figure{border-left:4px solid var(--primary-light)}
.lsn-media .lsn-chip{font-size:12px;padding:1px 10px;margin-bottom:4px}
/* 拡大表示（<dialog>）。style.css の *{margin:0} で中央寄せが外れるため margin:auto を戻す */
.lsn-dialog{margin:auto;padding:0;border:0;border-radius:14px;background:var(--primary-dark);color:var(--white);box-shadow:0 20px 60px rgba(0,0,0,.45);overflow:hidden;width:min(94vw,calc((94vh - 124px) * 1.5385),1600px);width:min(94vw,calc((94dvh - 124px) * 1.5385),1600px);min-width:min(94vw,560px);max-width:none;max-height:94vh;max-height:94dvh}
.lsn-dialog:not([open]){display:none}
.lsn-dialog[open]{display:flex;flex-direction:column}
.lsn-dialog::backdrop{background:rgba(10,50,40,.88)}
.lsn-dialog-bar{display:flex;align-items:center;gap:12px;padding:8px 8px 8px 18px;flex-shrink:0}
.lsn-dialog-titles{flex:1;min-width:0}
.lsn-dialog-cap{font-size:14px;font-weight:700;line-height:1.5}
.lsn-dialog-hint{font-size:12px;color:var(--gold-light);line-height:1.5}
.lsn-dialog-hint[hidden]{display:none}
.lsn-dialog-close{flex-shrink:0;width:44px;height:44px;border-radius:50%;color:var(--white);font-size:30px;line-height:1;background:rgba(255,255,255,.1)}
.lsn-dialog-close:hover{background:rgba(255,255,255,.2)}
.lsn-dialog-view{flex:1;min-height:0;display:flex;overflow:auto;overscroll-behavior:contain;background:#005429}
.lsn-dialog-view img{flex:none;width:100%;height:auto;max-width:none;margin:auto}
.lsn-dialog-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 14px;flex-shrink:0}
.lsn-dialog-nav button{min-height:44px;padding:6px 18px;color:var(--white);font-size:14px;font-weight:700;border:1.5px solid rgba(255,255,255,.45);border-radius:40px;transition:background .2s}
.lsn-dialog-nav button:hover{background:rgba(255,255,255,.12)}
.lsn-dialog-count{font-size:13px;color:rgba(255,255,255,.8);letter-spacing:.06em}
.lsn-dialog button:focus-visible{outline:3px solid var(--gold-light);outline-offset:2px}

@media(max-width:1024px){
  .lsn{margin-top:48px}
  .lsn-step-head{padding:20px 22px 0}
  .lsn-step-body{padding:8px 22px 20px}
}
@media(max-width:768px){
  .lsn{max-width:640px;margin-top:40px}
  .lsn-head{margin-bottom:28px}
  .lsn-lead{font-size:14px}
  .lsn-phase{margin-top:40px}
  .lsn-phase::after{display:none}
  .lsn-phase-num{width:30px;height:30px;font-size:13px}
  .lsn-phase-name{font-size:16px}
  .lsn-phase-desc{flex-basis:100%;padding-left:42px;font-size:13.5px}
  .lsn-step{grid-template-columns:minmax(0,1fr);grid-template-rows:auto;grid-template-areas:"head" "fig" "body"}
  .lsn-step-head{padding:16px 18px 12px}
  .lsn-step-body{padding:14px 18px 18px}
  .lsn-step h4{font-size:16px}
  .lsn-takeaway{padding:16px 18px;font-size:14px}
  .lsn-after{font-size:14px}
}
@media(max-width:480px){
  .lsn-desc{font-size:13.5px}
  .lsn-key{font-size:12.5px;padding:5px 10px}
  .lsn-step-head{padding:14px 16px 10px}
  .lsn-step-body{padding:12px 16px 16px}
  .lsn-tray{padding:7px 12px}
}
/* スマホ（縦・横）では拡大表示を全画面に */
@media(max-width:768px),(max-height:500px){
  .lsn-dialog{width:100vw;height:100vh;height:100dvh;min-width:0;max-height:none;border-radius:0}
}
/* 縦向きスマホは画面の高さいっぱい（最大 900×585px）に拡大し、横スクロールで読む */
@media(max-width:480px){
  .lsn-dialog-cap{font-size:13px}
  .lsn-dialog-view img{width:auto;aspect-ratio:20/13;height:min(585px,calc(100vh - 150px));height:min(585px,calc(100dvh - 150px))}
}