.tf-tool{margin:22px 0;padding:18px 20px 20px;border:1px solid var(--tf-border,#dde3ea);border-left:5px solid #2f9e7a;border-radius:8px;background:var(--tf-board,#fff);box-shadow:0 1px 4px rgba(47,65,84,0.08)}.tf-tool h2{margin:0 0 8px;font-size:1.15rem;color:var(--tf-text,#2f4154)}.tf-tool-formula{margin:0 0 6px;font-family:Georgia,"Times New Roman",serif;font-size:1rem;color:#2f9e7a;font-weight:600}.tf-tool-desc{margin:0 0 14px;font-size:0.9rem;color:var(--tf-sec,#718096)}.tf-tool-note{margin:12px 0 0;font-size:0.82rem;color:var(--tf-sec,#718096);border-top:1px dashed var(--tf-border,#dde3ea);padding-top:10px}.tf-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}.tf-grid label{display:flex;flex-direction:column;gap:5px;font-size:0.85rem;color:var(--tf-sec,#718096)}.tf-grid input[type="number"],.tf-grid select{width:100%;padding:7px 9px;border:1px solid var(--tf-border,#d0d8e2);border-radius:6px;background:var(--tf-input,#fafbfc);color:var(--tf-text,#2f4154);font-size:0.95rem;box-sizing:border-box}.tf-grid input:focus,.tf-grid select:focus{outline:none;border-color:#2f9e7a;box-shadow:0 0 0 2px rgba(47,158,122,0.15)}.tf-grid input[disabled]{opacity:0.55}.tf-grid-sliders label{font-size:0.85rem}.tf-grid-sliders input[type="range"]{width:100%;accent-color:#2f9e7a}.tf-grid-sliders span{font-size:0.82rem;color:var(--tf-text,#2f4154);font-variant-numeric:tabular-nums}.tf-result{margin-top:14px;padding:12px 14px;border-radius:6px;background:#eef7f1;color:#1f6e43;font-size:0.95rem;line-height:1.8;white-space:pre-line}.tf-result strong{color:#17603a}#gauss-canvas{width:100%;height:auto;margin-top:10px;border:1px solid var(--tf-border,#dde3ea);border-radius:8px;background:#fff}@media (prefers-color-scheme:dark){.tf-tool{--tf-border:#3a4658;--tf-board:#252d38;--tf-input:#2c3542;--tf-text:#d8dde4;--tf-sec:#a7aeb9;border-color:var(--tf-border);background:var(--tf-board)}.tf-tool-formula{color:#55c29b}.tf-result{background:#1d2a24;color:#8fe3bd}.tf-result strong{color:#b3f0d4}#gauss-canvas{background:#1c232e;border-color:var(--tf-border)}}@media (max-width:640px){.tf-tool{padding:14px 14px 16px}.tf-grid{grid-template-columns:1fr 1fr;gap:10px}.tf-result{font-size:0.88rem}}