.bk-tool{background:var(--paper-surface);border:1px solid var(--paper-border-strong);border-radius:14px;padding:1.25rem}.bk-mode-selector{display:inline-flex;border:1px solid var(--paper-border-strong);border-radius:8px;overflow:hidden;margin-bottom:.85rem;background-color:var(--paper-subtle);padding:2px}.bk-mode-tab{appearance:none;background:transparent;border:none;padding:.45rem 1rem;font-size:.85rem;font-weight:600;color:var(--ink-secondary);border-radius:6px;cursor:pointer;transition:transform .16s ease-out,background-color .16s ease-out,color .16s ease-out}@media(hover:hover)and (pointer:fine){.bk-mode-tab:hover:not(.is-active){background:var(--paper-surface);color:var(--ink-primary)}}.bk-mode-tab:active{transform:scale(.97)}.bk-mode-tab.is-active{background:var(--ink-primary);color:var(--paper-surface);box-shadow:0 1px 3px #0000001a}.bk-mode-tab:focus-visible{outline:2px solid var(--focus-ring);outline-offset:-2px}.bk-mode-hint{margin:0 0 .75rem;font-size:.84rem;color:var(--ink-muted);line-height:1.5}.bk-textarea{width:100%;box-sizing:border-box;min-height:6.5rem;padding:.95rem 1.1rem;font-size:1.08rem;line-height:2;font-family:var(--font-sans);color:var(--ink-primary);background:var(--paper-surface);border:1.5px solid var(--paper-border-strong);border-radius:10px;resize:vertical;transition:border-color .16s ease-out,box-shadow .16s ease-out}.bk-textarea:focus{outline:none;border-color:var(--accent-green);box-shadow:0 0 0 3px #0596691a}.bk-editor-bar{display:flex;flex-wrap:wrap;gap:.5rem 1rem;align-items:center;justify-content:space-between;margin-top:.75rem}.bk-count{font-size:.82rem;color:var(--ink-muted);font-variant-numeric:tabular-nums;font-weight:500}.bk-editor-actions{display:inline-flex;gap:.5rem;flex-wrap:wrap}.bk-btn{appearance:none;background:var(--ink-primary);color:var(--paper-surface);border:1px solid var(--ink-primary);border-radius:6px;padding:.42rem .95rem;font-size:.83rem;font-weight:600;cursor:pointer;transition:transform .16s ease-out,background-color .16s ease-out,border-color .16s ease-out,opacity .16s ease-out}@media(hover:hover)and (pointer:fine){.bk-btn:hover:not(:disabled){background:#059669;border-color:#059669}}.bk-btn:active:not(:disabled){transform:scale(.97)}.bk-btn:disabled{opacity:.45;cursor:default}.bk-btn--ghost{background:var(--paper-surface);color:var(--ink-primary);border-color:var(--paper-border-strong)}@media(hover:hover)and (pointer:fine){.bk-btn--ghost:hover:not(:disabled){background:var(--paper-subtle);border-color:var(--ink-muted)}}.bk-btn:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px}.bk-keyboard{margin-top:1.15rem;border-top:1px solid var(--paper-border);padding-top:1rem;display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%}.bk-unicode-columns{display:grid;grid-template-columns:1.2fr 1fr;gap:1.5rem;width:100%;max-width:840px;align-items:start}.bk-column{display:flex;flex-direction:column;align-items:center;width:100%}.bk-group{margin-bottom:.75rem;display:flex;flex-direction:column;align-items:center;width:100%}.bk-group-label{font-size:.76rem;font-weight:700;color:var(--ink-muted);margin:0 0 .35rem;letter-spacing:.04em;text-transform:uppercase;text-align:center}.bk-key-row{display:flex;justify-content:center;align-items:center;gap:3px;width:100%}.bk-key-row--wrap{flex-wrap:wrap;justify-content:center;max-width:680px}.bk-key-row--qwert{justify-content:center;margin-bottom:3px}.bk-key{appearance:none;position:relative;min-width:2.15rem;height:2.25rem;padding:0 .25rem;display:inline-flex;align-items:center;justify-content:center;background:var(--paper-subtle);border:1px solid var(--paper-border-strong);border-radius:5px;cursor:pointer;transition:transform .12s ease-out,background-color .12s ease-out,border-color .12s ease-out}@media(hover:hover)and (pointer:fine){.bk-key:hover{background:var(--paper-surface);border-color:#059669}}.bk-key:active{transform:scale(.94);background:#ecfdf5;border-color:#059669}.bk-key:focus-visible{outline:2px solid var(--focus-ring);outline-offset:1px}.bk-key-glyph{font-size:.95rem;font-weight:600;color:var(--ink-primary);line-height:1}.bk-key-glyph--latin{font-size:.75rem;font-weight:600}.bk-key-shift{position:absolute;top:1px;right:2px;font-size:.52rem;color:var(--ink-muted);line-height:1}.bk-key-hint{position:absolute;bottom:1px;right:2px;font-size:.52rem;color:var(--ink-muted);line-height:1}.bk-key--space{flex:0 1 12rem;min-width:6rem}.bk-key--fn{min-width:3.2rem}.bk-controls{margin-top:.4rem;justify-content:center;max-width:480px}.bk-dead-hint{margin:0 0 .4rem;font-size:.78rem;color:var(--accent-vermillion);font-weight:600}.bk-layout-note{margin:.6rem 0 0;font-size:.78rem;color:var(--ink-muted)}.bk-examples{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem 1rem;margin-top:.9rem;padding-top:.8rem;border-top:1px solid var(--paper-border);font-size:.82rem;color:var(--ink-secondary)}.bk-examples-label{font-weight:700;color:var(--ink-primary)}.bk-example code{font-family:var(--font-mono);font-size:.86em;background:var(--paper-subtle);border:1px solid var(--paper-border);border-radius:3px;padding:.05em .3em}.bk-examples-engine{margin-left:auto;font-size:.72rem;color:var(--ink-muted)}@media(max-width:640px){.bk-tool{padding:.85rem}.bk-key-row--qwert{justify-content:flex-start;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:.25rem}.bk-key-row--qwert .bk-key{flex:0 0 auto;min-width:2.6rem}.bk-key--space{min-width:5.5rem}.bk-examples-engine{margin-left:0}}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}