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0;border:none;border-radius:6px;padding:.75rem;font-weight:600;transition:all .3s}.mode-btn.active{color:#0f0f0f;background:#fff;box-shadow:0 2px 6px #00000040}.mode-btn:not(.active){background:#ffffff14}.auth-section{flex-direction:column;gap:1rem;display:flex}.provider-hint{text-align:center;color:var(--text-muted);margin-top:.5rem;font-size:.85rem}.apple-btn,.google-btn{cursor:pointer;border-radius:8px;justify-content:center;align-items:center;gap:.75rem;width:100%;padding:.875rem 1.5rem;font-size:1rem;font-weight:600;transition:all .3s;display:flex}.apple-btn{color:#fff;background:#000;border:2px solid #000}.apple-btn:hover{background:#111}.apple-icon,.google-icon{width:20px;height:20px}.google-btn{color:#333;background:#fff;border:2px solid #ddd;border-radius:8px}.google-btn:hover:not(:disabled){border-color:#4285f4;box-shadow:0 2px 8px #4285f433}.google-btn:disabled{opacity:.6;cursor:not-allowed}.google-icon{width:20px;height:20px}.auth-divider{text-align:center;align-items:center;margin:.5rem 0;display:flex}.auth-divider:before,.auth-divider:after{content:"";border-bottom:1px solid var(--border-color);flex:1}.auth-divider span{color:var(--text-secondary);padding:0 1rem;font-size:.875rem}.auth-input{border:2px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);border-radius:8px;padding:.875rem 1rem;font-size:1rem;transition:border-color .3s}.auth-input:focus{border-color:var(--accent-color);outline:none;box-shadow:0 0 0 3px #667eea1a}.auth-submit-btn{color:#fff;cursor:pointer;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:8px;padding:.875rem 1.5rem;font-size:1rem;font-weight:600;transition:all .3s}.auth-submit-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.auth-submit-btn:disabled{opacity:.6;cursor:not-allowed}.method-switch-btn{color:var(--accent-color);cursor:pointer;background:0 0;border:none;padding:.5rem;font-size:.9rem;text-decoration:underline;transition:all .3s}.method-switch-btn:hover{color:var(--accent-hover)}.auth-error{border:1px solid var(--danger-color);color:var(--danger-color);background:#ef44441a;border-radius:8px;margin-top:1rem;padding:1rem;font-size:.9rem}.auth-success{border:1px solid var(--success-color);color:var(--success-color);background:#10b9811a;border-radius:8px;margin-top:1rem;padding:1rem;font-size:.9rem}.auth-footer{background:var(--bg-secondary);text-align:center;border-top:1px solid var(--border-color);padding:1.5rem 2rem}.auth-footer p{color:var(--text-secondary);margin:0;font-size:.8rem}.lesson-data-button{z-index:60;background-color:var(--accent-color);color:#fff;cursor:pointer;border:none;border-radius:999px;padding:10px 16px;font-weight:600;position:fixed;bottom:24px;right:24px;box-shadow:0 6px 20px #0003}.lesson-data-button:hover{background-color:var(--accent-hover)}.lesson-data-overlay{z-index:70;background:#0000008c;justify-content:center;align-items:center;padding:24px;display:flex;position:fixed;inset:0}.lesson-data-panel{background:var(--bg-primary);width:min(640px,90vw);max-height:80vh;color:var(--text-primary);border-radius:16px;flex-direction:column;display:flex;box-shadow:0 12px 32px #00000059}.lesson-data-panel__header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.lesson-data-panel__body{padding:0 20px 20px;overflow-y:auto}.lesson-data-section+.lesson-data-section{margin-top:16px}.lesson-data-section h4{margin:0 0 6px;font-size:1rem}.lesson-data-section pre{white-space:pre-wrap;background:var(--bg-secondary);border-radius:8px;margin:0;padding:12px;font-size:.95rem}.lesson-data-close{color:var(--text-primary);cursor:pointer;background:0 0;border:none;font-weight:600}.board-with-tabs{flex-direction:column;height:100%;display:flex;overflow:hidden}.board-with-tabs>.tab-bar{flex-shrink:0}.board-with-tabs>:not(.tab-bar){flex:1;min-height:0}.board-column .tab-bar{flex-shrink:0}