:root{--verb-bg:#fafafa;--verb-text:#1c1c1e;--verb-muted:#6e6e73;--verb-accent:#007aff;--verb-highlight:#ffe066;--verb-user-bubble:#e5e5ea;--verb-input-bg:#e8e8ed;--verb-border-radius:24px;--verb-spacing-xs:4px;--verb-spacing-sm:8px;--verb-spacing-md:16px;--verb-spacing-lg:24px;--verb-spacing-xl:32px;--verb-shadow-sm:var(--verb-shadow-sm);--verb-shadow-md:var(--verb-shadow-md);--verb-shadow-lg:var(--verb-shadow-lg);--verb-success:#34c759;--verb-warning:#ff9500;--verb-error:#ff3b30}.nav-bar{display:flex;justify-content:space-between;align-items:center;padding:var(--verb-spacing-sm) var(--verb-spacing-md);margin:0 auto var(--verb-spacing-md) auto;max-width:800px;width:100%;border-bottom:1px solid var(--verb-input-bg)}.nav-brand{font-size:18px;font-weight:700;color:var(--verb-text);letter-spacing:-.02em}.nav-links{display:flex;gap:var(--verb-spacing-md);align-items:center}.nav-link{font-size:14px;color:var(--verb-muted);padding:6px 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rgba(0,0,0,.06)}.feedback-ideal-label{font-weight:500;color:var(--verb-muted)}.feedback-ideal-text{font-style:italic;margin-top:2px}.feedback-message strong{font-weight:600;color:inherit}.feedback-message em{font-style:italic;color:inherit}.feedback-message code{background-color:rgba(0,0,0,.05);padding:2px 6px;border-radius:4px;font-family:SF Mono,Monaco,Courier New,monospace;font-size:.9em}.feedback-message p{margin:0;display:inline}.feedback-message p+p{display:block;margin-top:8px}.input-area{display:flex;flex-direction:column;max-width:800px;width:100%;margin:0 auto}.writing-toolbar{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background:#fff;border-radius:16px 16px 0 0;border:1px solid #e5e5ea;border-bottom:none;flex-wrap:wrap;gap:8px}.writing-toolbar+.input-bar{border-radius:0 0 24px 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ease}.icon-btn:hover{background-color:rgba(0,0,0,.05)}.icon-btn.send{background-color:var(--verb-text);color:#fff}.icon-btn.send:hover{background-color:#3a3a3c}.icon-btn.send:disabled{background-color:#c7c7cc;cursor:not-allowed;opacity:.6}.action-btn{display:inline-flex;align-items:center;gap:var(--verb-spacing-sm);padding:var(--verb-spacing-sm) var(--verb-spacing-md);border:none;border-radius:var(--verb-border-radius);font-size:14px;font-weight:500;cursor:pointer;transition:background-color .15s 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8px;border-radius:6px}.exercise-card{background-color:#fff;border-radius:var(--verb-border-radius);padding:var(--verb-spacing-lg);margin-bottom:var(--verb-spacing-md);box-shadow:var(--verb-shadow-md)}.exercise-prompt{font-size:18px;line-height:1.6;margin-bottom:var(--verb-spacing-lg);color:var(--verb-text)}.exercise-submit-btn{width:100%;padding:14px var(--verb-spacing-md);background-color:var(--verb-accent);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;transition:background-color .15s ease;margin-top:var(--verb-spacing-md)}.exercise-submit-btn:hover:not(:disabled){background-color:#0066d6}.exercise-submit-btn:disabled{background-color:var(--verb-muted);cursor:not-allowed;opacity:.6}.matching-columns{position:relative;display:flex;justify-content:space-between;gap:var(--verb-spacing-lg);margin-bottom:var(--verb-spacing-md)}.matching-column{display:flex;flex-direction:column;gap:var(--verb-spacing-sm);flex:0 0 auto;min-width:120px;max-width:45%}.matching-item{padding:var(--verb-spacing-sm) var(--verb-spacing-md);border:2px solid var(--verb-input-bg);border-radius:8px;font-size:15px;font-family:inherit;color:var(--verb-text);background-color:#fff;cursor:pointer;transition:all .15s ease;text-align:left}.matching-item.active,.matching-item:hover:not(:disabled){border-color:var(--verb-accent)}.matching-item.active{background-color:rgba(0,122,255,.1);color:var(--verb-accent);font-weight:500}.matching-item.connected{border-color:var(--verb-accent);background-color:rgba(0,122,255,.06)}.matching-item.targetable{border-color:rgba(0,122,255,.3);background-color:rgba(0,122,255,.03)}.matching-item:disabled{opacity:.6;cursor:not-allowed}.matching-svg-overlay{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none}.matching-line{stroke:var(--verb-accent);stroke-width:2;pointer-events:stroke;cursor:pointer;transition:stroke-width .15s 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