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auto;display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:16px;border-bottom:1px solid var(--border)}.workbook-viewer-title h2{margin:0 0 4px;font-size:16px}.workbook-viewer-meta{margin:0;font-size:12px;color:var(--text-muted)}.workbook-viewer-close-btn{flex:0 0 auto;padding:8px 14px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text);font:inherit;font-size:13px;cursor:pointer}.workbook-viewer-body{flex:1 1 auto;min-height:0;overflow-y:auto;padding:16px}.workbook-viewer-text{margin:0 0 16px;white-space:pre-wrap;word-break:break-word;font-size:14px;line-height:1.7}.workbook-viewer-footer{flex:0 0 auto;display:flex;gap:10px;padding:12px 16px;border-top:1px solid var(--border)}.workbook-viewer-toggle-btn{flex:1 1 auto;padding:12px 16px;border:none;border-radius:8px;background:var(--primary);color:#fff;font:inherit;font-weight:600;cursor:pointer}.workbook-viewer-print-btn{flex:0 0 auto;padding:12px 16px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);font:inherit;font-weight:600;cursor:pointer}.auth-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;display:flex;align-items:flex-end;justify-content:center;background:#0000008c;padding:0}.auth-modal-content{width:100%;max-width:480px;max-height:92svh;display:flex;flex-direction:column;border-radius:16px 16px 0 0;overflow:hidden;background:var(--glass-fill-strong)}.auth-modal-header{flex:0 0 auto;display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:16px;border-bottom:1px solid var(--border)}.auth-modal-tabs{display:flex;gap:8px}.auth-modal-tab-btn{padding:8px 14px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text-muted);font:inherit;font-size:14px;font-weight:600;cursor:pointer}.auth-modal-tab-btn.is-active{background:var(--primary);border-color:var(--primary);color:#fff}.auth-modal-close-btn{flex:0 0 auto;padding:8px 14px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text);font:inherit;font-size:13px;cursor:pointer}.auth-modal-form{display:flex;flex-direction:column;gap:16px;padding:16px;overflow-y:auto}.auth-modal-info{margin:0;padding:12px 16px;color:#2f9e5c;background:#2f9e5c1f;border-radius:8px;font-size:13px;line-height:1.5}.auth-modal-submit-btn{margin-top:4px}.lab{display:flex;flex-direction:column;gap:16px}.lab-intro{margin:0;color:var(--text-muted);font-size:13px;line-height:1.6}.lab-filter-chips{display:flex;flex-wrap:wrap;gap:8px}.lab-filter-chip{display:flex;align-items:center;gap:6px;padding:8px 14px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--text);font:inherit;font-size:13px;font-weight:600;cursor:pointer}.lab-filter-chip.is-active{background:var(--primary);border-color:var(--primary);color:#fff}.lab-filter-count{font-size:11px;opacity:.75}.lab-card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.lab-card{display:flex;flex-direction:column;align-items:flex-start;gap:8px;min-height:88px;padding:14px;border:1px solid var(--glass-border);border-radius:var(--r-card);background:var(--glass-fill);backdrop-filter:blur(var(--glass-blur));-webkit-backdrop-filter:blur(var(--glass-blur));box-shadow:var(--glass-shadow);text-align:left;font:inherit;cursor:pointer}.lab-card-badge{padding:3px 8px;border-radius:999px;font-size:11px;font-weight:700;color:#fff}.lab-card-badge.lab-badge-physics{background:#3b82f6}.lab-card-badge.lab-badge-chemistry{background:#10b981}.lab-card-badge.lab-badge-biology{background:#f59e0b}.lab-card-badge.lab-badge-earth{background:#8b5cf6}.lab-card-badge.lab-badge-math{background:#ec4899}.lab-card-title{font-size:14px;font-weight:600;line-height:1.4}.lab-viewer-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;display:flex;flex-direction:column;background:var(--surface)}.lab-viewer-topbar{flex:0 0 auto;display:flex;align-items:center;gap:12px;padding:calc(12px + env(safe-area-inset-top)) 16px 12px;border-bottom:1px solid var(--border);background:var(--surface)}.lab-viewer-back-btn{flex:0 0 auto;padding:8px 10px;border:none;background:none;font:inherit;font-weight:600;color:var(--primary);cursor:pointer;white-space:nowrap}.lab-viewer-title{flex:1 1 auto;min-width:0;margin:0;font-size:15px;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lab-viewer-frame{flex:1 1 auto;min-height:0;width:100%;border:none;display:block}