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22px;background:var(--color-bg-card);border-bottom:1px solid var(--color-line)}.rd-left{display:flex;flex-direction:column;min-width:0}.rd-crumb{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--color-muted);font-weight:600}.rd-title{font-family:var(--font-serif);font-size:16px;letter-spacing:-.01em;color:var(--color-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.rd-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}.rd-modes{display:inline-flex;background:var(--color-line);border-radius:10px;padding:3px;gap:2px}.rd-modes button{border:none;background:transparent;padding:6px 12px;font:inherit;font-size:13px;font-weight:500;color:var(--color-muted);border-radius:7px;cursor:pointer}.rd-modes button.on{background:var(--color-bg-card);color:var(--color-text);box-shadow:var(--shadow-sm)}.rd-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border:1px solid 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#0f172a66;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.rd-exit:hover{background:#0f172a}.page-biblioteca{max-width:1040px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:4px 28px;align-items:start;padding:8px 28px 40px}.page-biblioteca>.hero{grid-column:1 / -1}.page-biblioteca .library-section{padding-top:8px}.page-bloques{max-width:980px;margin:0 auto;padding:8px 28px 40px}.page-bloques>.hero{padding-left:4px;padding-right:4px}.page-bloques .blocks-list{display:grid;grid-template-columns:1fr 1fr;gap:10px;align-items:start}.page-bloques .blocks-list.has-open .block:not(.open){opacity:.62}.page-mas{max-width:1080px;margin:0 auto;padding:4px 28px 40px;display:grid;grid-template-columns:minmax(300px,360px) 1fr;gap:0 32px;align-items:start}.page-mas .notes-head{grid-column:1 / -1}.page-mas .study-overview{grid-column:1}.page-mas .notes-section{grid-column:2}.page-mas .note-editor{grid-column:1 / -1;max-width:760px;min-height:60vh}}