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var(--border);border-radius:var(--radius);width:100%;min-height:240px;box-shadow:var(--shadow), 0 0 40px #00c8ff0a;justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.qr-preview canvas{max-width:100%;height:auto;display:block}.qr-placeholder{color:var(--text-muted);text-align:center;padding:32px;font-size:.9rem;line-height:1.8}.explainer{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);width:100%;box-shadow:var(--shadow)}.explainer-toggle{width:100%;color:var(--text-muted);cursor:pointer;text-align:left;background:0 0;border:none;justify-content:space-between;align-items:center;padding:12px 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