.modal.active{display:flex;align-items:center;justify-content:center}.calculator{background:var(--light-bg);border-radius:15px;padding:20px}.calc-display{background:var(--dark-bg);color:white;padding:15px;border-radius:10px;font-size:1.5rem;text-align:left;margin-bottom:15px;min-height:60px;word-wrap:break-word}.calc-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.calc-btn{padding:15px;border:none;border-radius:10px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .2s ease;background:#fff;color:var(--text-primary)}.calc-btn:hover{background:var(--primary-color);color:white;transform:scale(1.05)}.calc-btn.operator{background:var(--primary-color);color:white}.calc-btn.equals{background:var(--success-color);color:white;grid-column:span 2}.result-box{background:var(--light-bg);padding:15px;border-radius:10px;margin-top:15px;font-size:1.1rem;text-align:center}.toast{background:#fff;padding:15px 20px;border-radius:10px;box-shadow:0 5px 20px rgba(0,0,0,.2);margin-bottom:10px;display:flex;align-items:center;gap:10px;animation:toastSlideIn .3s ease;pointer-events:all}.toast.success{border-right:4px solid var(--success-color)}.toast.error{border-right:4px solid var(--error-color)}.toast.warning{border-right:4px solid var(--warning-color)}.toast.info{border-right:4px solid var(--primary-color)}.loading-overlay.active{display:flex}.dark-mode{--card-bg:#374151;--light-bg:#1f2937;--text-primary:#f9fafb;--text-secondary:#d1d5db;--border-color:#4b5563}.battery-save{*{animation-duration:.01s!important;transition-duration:.01s!important}}.hidden{display:none!important}