:root{--background-color: #f7f8fa;--card-background-color: #ffffff;--primary-text-color: #333333;--secondary-text-color: #6b7280;--border-color: #e5e7eb;--input-background-color: #f7f8fa;--accent-color: #10b981;--accent-color-hover: #059669;--error-color: #ef4444;--success-color: #22c55e;--font-family: "Inter", sans-serif;--box-shadow: 0 4px 15px rgba(0, 0, 0, .08);--theme-icon-color: #6b7280}html[data-theme=dark]{--background-color: #121212;--card-background-color: #1e1e1e;--primary-text-color: #e0e0e0;--secondary-text-color: #a0a0b0;--border-color: #3a3a3a;--input-background-color: #2a2a2a;--box-shadow: 0 4px 20px rgba(0, 0, 0, .25);--theme-icon-color: #a0a0b0}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--background-color);color:var(--primary-text-color);display:flex;justify-content:center;align-items:flex-start;min-height:100vh;padding:2.5rem 1.5rem;transition:background-color .3s ease,color .3s ease}main{width:100%;max-width:680px}.calculator-card{background-color:var(--card-background-color);border-radius:10px;box-shadow:var(--box-shadow);padding:2.5rem;display:flex;flex-direction:column;gap:2rem;transition:background-color .3s ease,box-shadow .3s ease}header{text-align:center}.header-content{display:flex;justify-content:center;align-items:center;gap:1rem;margin-bottom:.5rem;position:relative}header h1{font-size:2rem;font-weight:700;color:var(--primary-text-color);transition:color .3s ease}#theme-toggle{background:none;border:none;cursor:pointer;padding:.5rem;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--theme-icon-color);position:absolute;right:0;top:50%;transform:translateY(-50%);transition:background-color .2s ease,color .2s ease}#theme-toggle:hover{background-color:var(--input-background-color)}.theme-icon{width:22px;height:22px}header p{color:var(--secondary-text-color);font-size:1rem;line-height:1.5;transition:color .3s ease}.input-section,.output-section{width:100%}.form-group{margin-bottom:1.5rem}.form-group-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem}label{display:block;font-weight:600;margin-bottom:.6rem;color:var(--primary-text-color);font-size:.95rem;transition:color .3s ease}.instructions{font-size:.875rem;color:var(--secondary-text-color);margin-bottom:.8rem;line-height:1.4;transition:color .3s ease}input[type=number],textarea,select{width:100%;padding:.85rem;border:1px solid var(--border-color);border-radius:8px;font-family:inherit;font-size:1rem;background-color:var(--input-background-color);color:var(--primary-text-color);transition:border-color .2s,box-shadow .2s,background-color .3s ease,color .3s ease;-webkit-appearance:none;-moz-appearance:none;appearance:none}select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%236b7280'%3E%3Cpath fill-rule='evenodd' d='M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z' clip-rule='evenodd'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .75rem center;background-size:1.5em;padding-right:2.5rem}html[data-theme=dark] select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23a0a0b0'%3E%3Cpath fill-rule='evenodd' d='M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z' clip-rule='evenodd'/%3E%3C/svg%3E")}input[type=number]:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px #10b98140}textarea{resize:vertical}textarea[readonly]{background-color:var(--input-background-color);cursor:text}.button-group{display:flex;gap:.85rem;flex-wrap:wrap}button{flex-grow:1;padding:1rem 1.5rem;background-color:var(--accent-color);color:#fff;font-size:1.125rem;font-weight:600;border:none;border-radius:8px;cursor:pointer;transition:background-color .2s,box-shadow .2s}button:hover{background-color:var(--accent-color-hover);box-shadow:0 4px 10px #10b98133}#clear-btn{background-color:transparent;color:var(--secondary-text-color);border:1px solid var(--border-color);transition:background-color .2s,color .2s,border-color .2s}#clear-btn:hover{background-color:var(--border-color);color:var(--primary-text-color);box-shadow:none}.copy-button{padding:.6rem 1.2rem;font-size:.875rem;font-weight:500;background-color:transparent;color:var(--secondary-text-color);border:1px solid var(--border-color);border-radius:6px;cursor:pointer;transition:all .2s ease}.copy-button:hover{background-color:var(--border-color);color:var(--primary-text-color)}.copy-button.copied{background-color:var(--success-color);border-color:var(--success-color);color:#fff}.error-message{color:var(--error-color);font-weight:600;margin-bottom:1.5rem;text-align:center;padding:.75rem 1rem;background-color:#ef44441a;border-radius:8px;border:1px solid var(--error-color);display:none}.results-container{display:flex;flex-direction:column;gap:2rem}.totals-summary{background-color:var(--input-background-color);border-radius:8px;padding:2rem;border:1px solid var(--border-color);transition:background-color .3s ease,border-color .3s ease}h3{font-size:1.5rem;font-weight:700;margin-bottom:1.5rem;color:var(--primary-text-color);text-align:center;transition:color .3s ease}.totals-summary{display:flex;flex-direction:column;gap:1.25rem}.result-item{display:flex;justify-content:space-between;align-items:baseline;padding-bottom:.75rem;border-bottom:1px dashed var(--border-color);transition:border-color .3s ease}.result-item:last-child{border-bottom:none;padding-bottom:0}.result-item .label{font-weight:500;color:var(--secondary-text-color);font-size:.95rem;transition:color .3s ease}.result-item .value{font-size:1.35rem;font-weight:700;color:var(--accent-color)}.result-item .value.pieces-value{color:var(--primary-text-color);transition:color .3s ease}.result-item .value.red-highlight{color:var(--error-color)}.app-footer{text-align:center;margin-top:1rem;padding-top:1.5rem;border-top:1px solid var(--border-color);transition:border-color .3s ease}.app-footer p{color:var(--secondary-text-color);font-size:.875rem;transition:color .3s ease}@media(max-width:768px){body{padding:1.5rem 1rem;align-items:stretch}.calculator-card{padding:2rem;border-radius:6px}.header-content{justify-content:space-between;gap:.5rem}header h1{font-size:1.75rem}#theme-toggle{position:static;transform:none}.totals-summary{padding:1.5rem}.result-item .value{font-size:1.2rem}}@media(max-width:480px){body{padding:1rem .5rem}.calculator-card{padding:1.5rem;gap:1.5rem}header h1{font-size:1.5rem}.button-group{flex-direction:column}button{width:100%}.totals-summary{padding:1.25rem}}