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320px;gap:0;height:100%}.bb-layout-canvas{background:var(--paper-100);padding:28px;overflow-y:auto}.bb-layout-canvas-frame{background:var(--bg-1);border-radius:8px;border:1px solid var(--paper-200);padding:24px 32px;max-width:900px;margin:0 auto;min-height:100%;box-shadow:var(--shadow-sm)}.bb-section-block{position:relative;border:2px dashed transparent;border-radius:6px;padding:16px;margin:8px -16px;transition:border .14s;cursor:grab}.bb-section-block.is-selected,.bb-section-block:hover{border-color:var(--brand-200);background:rgba(59,91,255,.025)}.bb-section-block.is-selected{border-color:var(--brand-500)}.bb-section-block-tag{position:absolute;top:-10px;left:8px;background:var(--bg-1);padding:0 8px;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand-500);font-weight:600;opacity:0;transition:opacity .14s}.bb-section-block.is-selected .bb-section-block-tag,.bb-section-block:hover .bb-section-block-tag{opacity:1}.bb-section-block-actions{position:absolute;top:-14px;right:8px;display:flex;gap:4px;background:#fff;padding:2px;border-radius:5px;border:1px solid var(--paper-200);opacity:0;transition:opacity .14s}.bb-section-block.is-selected .bb-section-block-actions,.bb-section-block:hover .bb-section-block-actions{opacity:1}.bb-section-block-action{width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;border-radius:4px;background:transparent;border:none;cursor:pointer;color:var(--fg-3)}.bb-section-block-action:hover{background:var(--paper-100);color:var(--fg-1)}.bb-layout-rail{background:var(--bg-1);border-left:1px solid var(--paper-200);overflow-y:auto}.bb-layout-rail-tabs{display:flex;padding:0 16px;border-bottom:1px solid var(--paper-200);height:41px;align-items:center;gap:4px}.bb-layout-rail-tab{padding:0 12px;height:41px;display:inline-flex;align-items:center;font-size:12.5px;color:var(--fg-2);background:transparent;border:none;border-bottom:2px solid transparent;cursor:pointer;margin-bottom:-1px;font-family:inherit}.bb-layout-rail-tab.is-active{color:var(--fg-1);border-bottom-color:var(--brand-500);font-weight:500}.bb-section-library{padding:16px;display:flex;flex-direction:column;gap:8px}.bb-section-library-head{font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--fg-3);font-weight:500;padding:8px 0 4px}.bb-section-card{padding:14px;border:1px solid var(--paper-200);border-radius:6px;background:#fff;cursor:grab;transition:border .14s,box-shadow .14s}.bb-section-card:hover{border-color:var(--brand-300,var(--brand-200));box-shadow:var(--shadow-sm)}.bb-section-card-name{font-size:13px;font-weight:500;color:var(--fg-1);display:flex;align-items:center;gap:6px;margin-bottom:4px}.bb-section-card-desc{font-size:11.5px;color:var(--fg-3);line-height:1.4;margin-bottom:8px}.bb-section-card-preview{aspect-ratio:16/6;background:var(--paper-100);border-radius:4px;padding:6px;display:flex;gap:4px}.bb-section-card-preview .row{background:var(--paper-200);border-radius:2px;flex:1}.bb-inspector{padding:20px;display:flex;flex-direction:column;gap:18px}.bb-inspector-title{font-size:13.5px;font-weight:600;color:var(--fg-1);display:flex;align-items:center;gap:8px;padding-bottom:10px;border-bottom:1px solid var(--paper-200)}.bb-inspector-title-tag{font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand-500);font-weight:500;padding:2px 6px;background:var(--brand-50);border-radius:3px}.bb-slot{display:flex;align-items:center;gap:10px;padding:8px;border:1px dashed var(--paper-300);border-radius:5px;cursor:pointer;transition:border .14s}.bb-slot:hover{border-color:var(--brand-500);border-style:solid}.bb-slot-num{width:20px;height:20px;border-radius:4px;background:var(--paper-200);color:var(--fg-2);font-family:var(--font-mono);font-size:11px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.bb-slot-text{font-size:12.5px;color:var(--fg-1);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.bb-slot-meta{font-family:var(--font-mono);font-size:11px;color:var(--fg-3)}.bb-media-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.bb-media-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}.bb-media-item{display:flex;flex-direction:column;gap:8px;cursor:pointer}.bb-media-thumb{aspect-ratio:4/3;border-radius:6px;border:1px solid var(--paper-200);overflow:hidden;position:relative;background:var(--paper-100);display:flex;align-items:center;justify-content:center}.bb-media-item:hover .bb-media-thumb{border-color:var(--paper-400)}.bb-media-item.is-selected .bb-media-thumb{border-color:var(--brand-500);box-shadow:0 0 0 3px rgba(59,91,255,.16)}.bb-media-thumb-glyph{font-family:var(--font-jp-serif);font-size:56px;line-height:1;opacity:.85}.bb-media-tag{position:absolute;top:6px;right:6px;padding:2px 6px;background:rgba(14,15,18,.7);color:var(--paper-100);font-family:var(--font-mono);font-size:10px;border-radius:3px;letter-spacing:.04em}.bb-media-name{font-size:12.5px;font-weight:500;color:var(--fg-1);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bb-media-meta{font-family:var(--font-mono);font-size:10.5px;color:var(--fg-3)}.bb-media-detail{background:var(--bg-1);border:1px solid var(--paper-200);border-radius:8px;padding:20px;display:flex;flex-direction:column;gap:16px}.bb-divider-rule{height:1px;background:var(--paper-200);margin:24px 0}.bb-spacer-8{height:8px}.bb-spacer-16{height:16px}.bb-spacer-24{height:24px}.bb-row,.bb-row-end{display:flex;align-items:center;gap:8px}.bb-row-end{justify-content:flex-end}.bb-stack{display:flex;flex-direction:column;gap:12px}.bb-flex-1{flex:1}.bb-annotation{position:absolute;background:var(--sumi-900);color:var(--paper-50);padding:6px 10px;font-family:var(--font-mono);font-size:11px;border-radius:4px;letter-spacing:.02em;z-index:5;pointer-events:none}.bb-annotation:before{content:"";position:absolute;width:8px;height:8px;background:inherit;transform:rotate(45deg)}.bb-annotation.left:before{left:-3px;top:50%;margin-top:-4px}.bb-annotation.top:before{top:-3px;left:16px}