/* マホロバ学校の棚（黒板・展示授業）。school-shelf.js と対。 */
:root{
  --sc-board:#173f37;--sc-board-deep:#10352e;--sc-chalk:#f3f1dc;--sc-chalk-dim:#cfd3c0;--sc-chalk-yellow:#f4df9c;
  --sc-wood:#9d724a;--sc-wood-dark:#6f4f32;
  --sc-paper:#eee8da;--sc-card:#fffaf0;--sc-ink:#26302a;--sc-sub:#4d554f;--sc-line:#26302a26;--sc-accent:#5a714e;
}
.sc-mincho,.sc-board-title,.sc-board-head,.sc-card-title,.sc-lesson-title,.sc-section-title,.sc-step-title,.sc-question-text,.sc-shelf-title{font-family:"Yu Mincho","Hiragino Mincho ProN",serif}

/* 学校ページの区画 */
.sc-zone{padding:clamp(36px,6vw,72px) max(16px,5vw);scroll-margin-top:72px}
.sc-zone-board{background:#1d2622}
.sc-zone-shelf{background:var(--sc-paper);color:var(--sc-ink);border-top:1px solid #8d9b8f66}
.sc-zone-inner{max-width:1080px;margin:0 auto}
.sc-zone-kicker{margin:0 0 8px;font-size:12px;letter-spacing:.18em;color:#b9b3a3}
.sc-zone-shelf .sc-zone-kicker{color:#59695d}
.sc-zone-title{margin:0 0 10px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(24px,3.6vw,38px);font-weight:600;letter-spacing:.06em;line-height:1.5;color:#f3ead6}
.sc-zone-shelf .sc-zone-title{color:var(--sc-ink)}
.sc-zone-lead{margin:0 0 26px;font-size:14px;line-height:1.9;color:#d9cfba;max-width:680px}
.sc-zone-shelf .sc-zone-lead{color:var(--sc-sub)}

/* 黒板 */
.sc-board{position:relative;padding:clamp(10px,1.6vw,16px);background:linear-gradient(180deg,#a87c52,var(--sc-wood) 40%,var(--sc-wood-dark));border-radius:6px;box-shadow:0 18px 40px #0007,inset 0 0 0 1px #00000040}
.sc-board-face{position:relative;padding:clamp(20px,3.4vw,40px) clamp(16px,3vw,36px) clamp(24px,3.6vw,40px);background:radial-gradient(ellipse at 30% 20%,#1f4a41 0,var(--sc-board) 45%,var(--sc-board-deep) 100%);border-radius:3px;box-shadow:inset 0 0 40px #0005;color:var(--sc-chalk)}
.sc-board-title{margin:0 0 clamp(16px,2.6vw,26px);text-align:center;font-size:clamp(20px,2.8vw,28px);letter-spacing:.24em;color:var(--sc-chalk);text-shadow:0 0 1px #f3f1dc80}
.sc-board-grid{display:grid;grid-template-columns:repeat(var(--cols,3),minmax(0,1fr));gap:clamp(18px,3vw,34px)}
.sc-board-col{min-width:0}
.sc-board-head{margin:0 0 12px;padding-bottom:8px;border-bottom:2px dashed #f3f1dc66;font-size:clamp(17px,2vw,20px);font-weight:600;letter-spacing:.12em;color:var(--sc-chalk)}
.sc-board-head.is-yellow{color:var(--sc-chalk-yellow);border-color:#f4df9c80}
.sc-board-list{list-style:none;margin:0;padding:0;display:grid;gap:16px}
.sc-board-item{display:grid;gap:6px}
.sc-board-text{margin:0;font-size:15px;line-height:1.85;letter-spacing:.03em;color:var(--sc-chalk);overflow-wrap:anywhere}
.sc-board-by{margin:0;font-size:12px;letter-spacing:.1em;color:var(--sc-chalk-dim)}
.sc-board-link{justify-self:start;display:inline-flex;align-items:center;min-height:44px;color:var(--sc-chalk-yellow);font-size:14px;letter-spacing:.06em;text-decoration:underline;text-underline-offset:5px}
.sc-board-link:hover{color:#fff}
.sc-board-ledge{height:10px;margin:8px 6% 0;border-radius:2px;background:linear-gradient(180deg,#7a5536,#5a3d26);box-shadow:0 4px 8px #0006}
.sc-board-note{margin:18px 0 0;font-size:13px;letter-spacing:.04em;color:#d9cfba}
.sc-board-note a{color:inherit;display:inline-flex;align-items:center;min-height:44px;text-underline-offset:5px}
.sc-board-link:focus-visible,.sc-board-note a:focus-visible{outline:2px solid var(--sc-chalk-yellow);outline-offset:3px}
@media (max-width:760px){.sc-board-grid{grid-template-columns:1fr}.sc-board-col+.sc-board-col{padding-top:6px}}

/* 棚 */
.sc-chips{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.sc-chip{display:inline-flex;align-items:center;min-height:40px;padding:0 14px;border:1px solid #26302a40;border-radius:999px;background:transparent;color:var(--sc-ink);font:inherit;font-size:13px;letter-spacing:.04em;cursor:pointer}
.sc-chip[aria-pressed="true"]{background:var(--sc-ink);color:#fbf6ec;border-color:var(--sc-ink)}
.sc-chip:focus-visible,.sc-card:focus-visible{outline:3px solid #8f642f;outline-offset:3px}
.sc-shelf-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:18px}
.sc-card{display:grid;align-content:start;gap:8px;padding:22px 22px 20px;min-width:0;background:var(--sc-card);border:1px solid #8d9b8f66;border-top:4px solid var(--sc-board);color:var(--sc-ink);text-decoration:none;box-shadow:0 10px 24px #26302a12;transition:transform .15s,box-shadow .15s}
.sc-card:hover{transform:translateY(-2px);box-shadow:0 14px 30px #26302a22}
@media (prefers-reduced-motion:reduce){.sc-card{transition:none}.sc-card:hover{transform:none}}
.sc-card-kicker{margin:0;font-size:11px;letter-spacing:.18em;color:var(--sc-accent)}
.sc-card-title{margin:0;font-size:clamp(19px,2.2vw,22px);font-weight:600;line-height:1.55;letter-spacing:.03em}
.sc-card-summary{margin:0;font-size:13.5px;line-height:1.9;color:var(--sc-sub)}
.sc-card-meta{margin:4px 0 0;font-size:12px;letter-spacing:.06em;color:#59695d}
.sc-card-tags{display:flex;flex-wrap:wrap;gap:6px;margin:2px 0 0}
.sc-tag{display:inline-block;padding:2px 10px;border-radius:999px;background:#e1e5d7;font-size:11px;letter-spacing:.06em;color:#3c4a3f}

/* 隣の建物への道 */
.sc-next{background:var(--sc-paper);color:var(--sc-ink);padding:0 max(16px,5vw) clamp(40px,6vw,64px)}
.sc-next-inner{max-width:1080px;margin:0 auto;padding-top:28px;border-top:1px solid #8d9b8f66}
.sc-next-title{margin:0 0 14px;font-size:12px;letter-spacing:.18em;color:#59695d}
.sc-next-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:12px}
.sc-next-card{display:grid;gap:4px;padding:16px 18px;min-height:44px;border:1px solid #5a714e66;background:#fffaf0;color:var(--sc-ink);text-decoration:none}
.sc-next-card:hover{border-color:var(--sc-accent)}
.sc-next-card:focus-visible{outline:3px solid #8f642f;outline-offset:3px}
.sc-next-name{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:18px;font-weight:600;letter-spacing:.06em}
.sc-next-note{font-size:13px;line-height:1.7;color:var(--sc-sub)}
.sc-next-back{display:flex;flex-wrap:wrap;gap:6px 24px;margin-top:18px}
.sc-next-back a{display:inline-flex;align-items:center;min-height:44px;color:var(--sc-ink);text-underline-offset:4px;font-size:14px}

/* 授業ページ */
.sc-lesson-page{background:var(--sc-paper)}
.sc-lesson{max-width:820px;margin:0 auto;padding:clamp(28px,5vw,56px) max(16px,4vw) clamp(40px,6vw,72px);color:var(--sc-ink)}
.sc-lesson-head{padding:clamp(24px,4vw,40px) clamp(18px,3.4vw,36px);margin:0 0 24px;background:radial-gradient(ellipse at 30% 20%,#1f4a41 0,var(--sc-board) 50%,var(--sc-board-deep));border:clamp(8px,1.2vw,12px) solid var(--sc-wood);border-radius:4px;color:var(--sc-chalk);box-shadow:0 14px 30px #26302a30}
.sc-lesson-kicker{margin:0 0 12px;font-size:12px;letter-spacing:.18em;color:var(--sc-chalk-yellow)}
.sc-lesson-title{margin:0 0 14px;font-size:clamp(26px,5vw,40px);font-weight:600;line-height:1.5;letter-spacing:.04em}
.sc-lesson-summary{margin:0 0 16px;font-size:15px;line-height:1.95}
.sc-lesson-meta{margin:0;padding-top:12px;border-top:1px dashed #f3f1dc55;font-size:12px;line-height:1.8;letter-spacing:.06em;color:var(--sc-chalk-dim)}
.sc-guide{display:grid;gap:6px;margin:0 0 34px;padding:18px 20px;background:var(--sc-card);border:1px solid #8d9b8f66;border-left:4px solid var(--sc-accent);border-radius:2px 14px 14px 2px}
.sc-guide-name{margin:0;font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--sc-accent)}
.sc-guide-line{margin:0;font-size:15px;line-height:1.95}
.sc-steps{list-style:none;margin:0 0 40px;padding:0;position:relative}
.sc-steps::before{content:"";position:absolute;left:19px;top:8px;bottom:8px;width:2px;background:linear-gradient(#5a714e66,#5a714e22)}
.sc-step{position:relative;display:grid;grid-template-columns:40px minmax(0,1fr);gap:16px;padding:0 0 28px}
.sc-step-no{position:relative;z-index:1;display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--sc-board);color:var(--sc-chalk);font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:16px;box-shadow:0 0 0 4px var(--sc-paper)}
.sc-step-body{min-width:0;padding-top:2px}
.sc-step-when{margin:0 0 2px;font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--sc-wood-dark)}
.sc-step-title{margin:0 0 8px;font-size:clamp(19px,2.6vw,23px);font-weight:600;line-height:1.55;letter-spacing:.03em}
.sc-step-text{margin:0 0 10px;font-size:15px;line-height:1.95}
.sc-step-change{margin:0;padding:12px 14px;background:#e1e5d7;font-size:14px;line-height:1.9;color:#2e3a31}
.sc-step-change-label{display:block;margin-bottom:2px;font-size:11px;font-weight:700;letter-spacing:.16em;color:var(--sc-accent)}
.sc-section-title{margin:0 0 14px;font-size:clamp(20px,2.8vw,26px);font-weight:600;letter-spacing:.05em;line-height:1.5}
.sc-takeaways,.sc-try,.sc-related,.sc-more,.sc-sources{margin:0 0 36px}
.sc-take-list{margin:0;padding-left:1.4em;display:grid;gap:12px;font-size:15px;line-height:1.95}
.sc-take-list li::marker{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-weight:700;color:var(--sc-accent)}
.sc-question{margin:0 0 36px;padding:clamp(22px,3vw,30px);background:var(--sc-board);border-radius:3px;color:var(--sc-chalk);text-align:center}
.sc-question-label{margin:0 0 10px;font-size:12px;letter-spacing:.22em;color:var(--sc-chalk-yellow)}
.sc-question-text{margin:0;font-size:clamp(18px,2.6vw,22px);line-height:1.8;letter-spacing:.04em}
.sc-link-list,.sc-source-list{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.sc-link-list a,.sc-source-list a,.sc-lesson-back a,.sc-back{display:inline-flex;align-items:center;min-height:44px;color:var(--sc-ink);text-underline-offset:4px;font-size:14px;line-height:1.6;overflow-wrap:anywhere}
.sc-source-list a{font-size:13px}
.sc-sources-note{margin:0 0 10px;font-size:13px;line-height:1.85;color:var(--sc-sub)}
.sc-related-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:12px}
.sc-related-card{display:grid;gap:6px;padding:16px 18px;background:var(--sc-card);border:1px solid #5a714e66;color:var(--sc-ink);text-decoration:none}
.sc-related-card:hover{border-color:var(--sc-accent)}
.sc-related-label{font-size:15px;line-height:1.7}
.sc-related-note{font-size:12px;letter-spacing:.08em;color:var(--sc-accent)}
.sc-lesson-back{display:flex;flex-wrap:wrap;gap:6px 24px;padding-top:18px;border-top:1px solid #8d9b8f66}
.sc-error{margin:0 0 12px;font-size:14px;line-height:1.8}
.sc-link-list a:focus-visible,.sc-source-list a:focus-visible,.sc-lesson-back a:focus-visible,.sc-related-card:focus-visible,.sc-next-back a:focus-visible{outline:3px solid #8f642f;outline-offset:3px}
.sc-lesson-page .b01-header{position:relative;background:var(--sc-board-deep);text-shadow:none}
.sc-lesson-page .b01-header a{color:var(--sc-chalk)}
.sc-card-title,.sc-lesson-title,.sc-step-title,.sc-question-text,.sc-zone-title,.sc-board-text,.sc-next-name{word-break:auto-phrase}