.classroom-guide{width:min(960px,calc(100vw - 32px));max-height:min(820px,calc(100dvh - 40px));padding:0;border:1px solid var(--line,#d5e1ef);border-radius:20px;background:var(--panel,#fff);color:var(--ink,#20344f);box-shadow:0 24px 80px #152f4e35;font-family:inherit}
.classroom-guide::backdrop{background:#142b4d80}
.classroom-guide>header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 24px;border-bottom:1px solid var(--line,#d5e1ef)}
.classroom-guide h2{margin:0;font-size:1.4rem}.classroom-guide h3{margin:0 0 12px;font-size:1.6rem}.classroom-guide h4{margin:0 0 8px;font-size:1rem}
.classroom-guide button{font:inherit;cursor:pointer;min-height:44px;padding:9px 14px;border:1px solid var(--line,#d5e1ef);border-radius:10px;background:var(--green-soft,#eef5ff);color:var(--green,#235b91)}
.classroom-guide-layout{display:grid;grid-template-columns:190px minmax(0,1fr);min-height:0;max-height:calc(100dvh - 125px)}
.classroom-guide-nav{padding:14px;display:flex;flex-direction:column;gap:6px;overflow-y:auto;border-right:1px solid var(--line,#d5e1ef)}
.classroom-guide-nav button{text-align:left;flex-shrink:0;border-color:transparent;background:transparent}.classroom-guide-nav button[aria-pressed=true]{background:var(--green,#235b91);color:#fff}
.classroom-guide-content{padding:26px;overflow-y:auto;line-height:1.8;word-break:keep-all;overflow-wrap:anywhere}.classroom-guide-summary{color:var(--muted,#60748f);margin:0 0 22px}.classroom-guide ol{padding-left:24px}.classroom-guide li{padding-left:4px;margin-bottom:14px}.classroom-guide-tips{margin-top:22px;padding:18px;border-radius:14px;background:var(--green-soft,#eef5ff);font-size:.9rem}.classroom-guide-tips ul{padding-left:20px;margin-bottom:0}.classroom-guide-tips li:last-child{margin-bottom:0}
.classroom-guide :focus-visible{outline:3px solid #7dafec;outline-offset:3px}
@media(max-width:640px){.classroom-guide-layout{grid-template-columns:1fr;max-height:calc(100dvh - 115px)}.classroom-guide-nav{flex-direction:row;overflow-x:auto;overflow-y:hidden;border-right:0;border-bottom:1px solid var(--line,#d5e1ef);padding:10px;max-width:100%}.classroom-guide-content{padding:20px;max-height:calc(100dvh - 195px)}.classroom-guide>header{padding:14px 18px}}