/* V6 integration: independent from textbook typography and saved learning data. */
.essential-link{display:inline-flex;align-items:center;min-height:36px;padding:5px 10px;border:1px solid #9cbbae;border-radius:7px;background:#eef5f1;color:#174c3b;font-size:.78rem;font-weight:700;line-height:1.6;text-decoration:none;max-width:100%;overflow-wrap:anywhere;box-sizing:border-box}
.essential-link:hover,.essential-link:focus-visible{background:#dcece3;border-color:#346b53;outline:2px solid #7ea58f;outline-offset:2px}
.essential-links{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.question-essential{margin:6px 0 10px}
.essential-chapter,.essential-guide{max-width:1460px;box-sizing:border-box;margin:18px auto;padding:14px 20px;border:1px solid #b9cfc3;border-radius:12px;background:#f4f8f5;color:#193e30}
.essential-chapter>strong{margin-right:12px}.essential-chapter details{margin-top:8px}.essential-chapter summary{cursor:pointer}.essential-chapter ul{margin:10px 0;padding-left:22px}.essential-chapter li{padding:5px 0}
.map-table th:nth-child(1){width:36%!important}.map-table th:nth-child(2){width:15%!important}.map-table th:nth-child(3){width:19%!important}.map-table th:nth-child(4){width:30%!important}
.section-block[id^="v6-topic-"]{scroll-margin-top:18px}
.v6-reader-nav{font-family:UD,"BIZ UDGothic",sans-serif;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;box-sizing:border-box;max-width:1100px;margin:12px auto;padding:10px 14px;background:#f1f6f2;border:1px solid #bdcfc3;border-radius:10px;font-size:14px;line-height:1.6}
.v6-reader-nav a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;box-sizing:border-box;padding:7px 12px;border:1px solid #9db9a8;border-radius:6px;background:#fff;color:#214d38;text-decoration:none;font-weight:700;max-width:100%;overflow-wrap:anywhere}
.v6-reader-nav a:hover,.v6-reader-nav a:focus-visible{background:#e0ede4;outline:2px solid #528362;outline-offset:2px}
.v6-reader-nav [hidden]{display:none!important}
@media(max-width:760px){.chapter-essential .essential-link{min-width:112px}.chapter-essential::before{content:"ES版";display:inline-block;font-size:.72rem;color:#52685c;margin-right:10px}.essential-chapter{margin:14px 12px;padding:12px}.v6-reader-nav{margin:8px;justify-content:flex-start;padding:8px;gap:6px}.v6-reader-nav a{font-size:13px;flex:1 1 140px}.essential-link{font-size:.76rem}}
@media print{.v6-reader-nav,.essential-chapter,.essential-links,.chapter-essential .essential-link,.essential-guide{display:none!important}}

.es-reference-links{display:inline-flex;gap:6px;flex-wrap:wrap;margin-left:8px;vertical-align:middle}.es-reference-links .essential-link{font-size:.75rem;min-height:30px}.references>p{line-height:2}@media print{.es-reference-links{display:inline}.es-reference-links .essential-link{display:inline;border:0;padding:0;background:none;color:inherit;font-size:inherit;min-height:0}}