.crumb{display:flex;gap:8px;align-items:center;margin:22px 0 14px;color:var(--muted)}.crumb a{color:inherit}.trial-hero{display:grid;grid-template-columns:1.45fr .8fr;gap:22px;padding:32px;border:1px solid var(--line);border-radius:24px;background:linear-gradient(135deg,#f1f8f5,#fffdf8 55%,#edf3ff)}.trial-hero h1{max-width:760px;margin:.3rem 0 1rem}.trial-hero p{max-width:720px}.trial-note{align-self:stretch;display:flex;flex-direction:column;gap:10px;padding:20px;border-radius:18px;background:#173c34;color:#fff;line-height:1.55}.trial-note b{font-size:1.05rem}.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.chip{border:1px solid var(--line);border-radius:999px;background:#fff;padding:6px 10px;font-size:.84rem;font-weight:700}.trial-section,.source-register{margin-top:36px}.group-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:16px}.group-head h2{margin:0}.group-head .ey{margin:0 0 5px}.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.lesson-card{display:flex;flex-direction:column;align-items:flex-start;gap:13px;min-height:250px;padding:22px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:0 6px 24px rgba(32,57,47,.05)}.lesson-card h3{margin:0;font-size:1.3rem}.lesson-card p{margin:0;color:var(--muted);line-height:1.5}.lesson-card .card-bottom{margin-top:auto;width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px}.lesson-card button{cursor:pointer;border:0;border-radius:10px;padding:10px 13px;background:#1d5547;color:#fff;font:inherit;font-weight:800}.lesson-card button:hover{background:#123c32}.source-list{display:grid;gap:10px}.source-row{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;padding:18px 20px;border:1px solid var(--line);border-radius:15px;background:#fff}.source-row h3,.source-row p{margin:0}.source-row p{margin-top:5px;color:var(--muted)}.source-row .status{white-space:nowrap}.source-viewer{width:min(1100px,94vw);height:min(90vh,900px);padding:0;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 24px 100px rgba(0,0,0,.25)}.source-viewer::backdrop{background:rgba(15,26,23,.55)}.viewer-top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px 10px}.viewer-top h2{margin:2px 0 0}.viewer-top .ey{margin:0}.close-viewer{border:1px solid var(--line);border-radius:9px;background:#fff;padding:9px 12px;cursor:pointer;font:inherit;font-weight:700}.viewer-meta{padding:0 22px 16px;color:var(--muted)}.source-viewer iframe{display:block;width:100%;height:calc(100% - 160px);border:0;background:#e9e9e9}.viewer-actions{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 22px}.viewer-actions p{margin:0;color:var(--muted);font-size:.86rem}@media(max-width:760px){.trial-hero{grid-template-columns:1fr;padding:22px}.lesson-grid{grid-template-columns:1fr}.source-row{grid-template-columns:1fr}.source-row .status{justify-self:start}.viewer-actions{align-items:flex-start;flex-direction:column}.source-viewer iframe{height:calc(100% - 190px)}}
.source-pages{height:calc(100% - 142px);overflow:auto;padding:0 22px 22px;background:#e7e7e7}.source-pages img{display:block;width:min(100%,880px);height:auto;margin:18px auto 0;box-shadow:0 2px 10px rgba(0,0,0,.22)}@media(max-width:760px){.source-pages{height:calc(100% - 172px);padding:0 10px 14px}.source-pages img{margin-top:10px}}
.file-picker{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.88rem;font-weight:700}.file-picker select{min-width:135px;border:1px solid var(--line);border-radius:9px;background:#fff;padding:8px;color:var(--ink);font:inherit}
.library-actions{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.teacher-guide-button{cursor:pointer;border:1px solid #1d5547;border-radius:9px;padding:8px 11px;background:#fff;color:#1d5547;font:inherit;font-size:.88rem;font-weight:800}@media(max-width:760px){.library-actions{align-items:flex-start;flex-direction:column}}
.section-intro{max-width:780px;margin:-4px 0 16px;color:var(--muted);line-height:1.55}.resource-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.resource-card{display:flex;min-height:205px;flex-direction:column;align-items:flex-start;gap:10px;padding:19px;border:1px solid var(--line);border-radius:16px;background:#fff}.resource-card h3,.resource-card p{margin:0}.resource-card p{color:var(--muted);line-height:1.5}.resource-card button{margin-top:auto;cursor:pointer;border:1px solid #1d5547;border-radius:9px;padding:8px 11px;background:#fff;color:#1d5547;font:inherit;font-weight:800}.resource-card button:hover{background:#eef7f2}@media(max-width:760px){.resource-grid{grid-template-columns:1fr}}