.tool-header{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:25px}
.tool-header p{max-width:760px}.input-grid{display:grid;grid-template-columns:1.4fr .7fr 1fr;gap:16px}.actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:18px}
.details-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.detail{border:1px solid var(--line);border-radius:12px;padding:14px;background:#fbfcfe}
.detail span{display:block;color:var(--muted);font-size:11px;margin-bottom:6px}.detail strong{font-family:Consolas,monospace;font-size:14px;word-break:break-all}
.insights-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.insight{border:1px solid var(--line);border-radius:12px;padding:15px;background:#fbfcfe}
.insight strong{display:block;margin-bottom:5px;font-size:14px}.insight p{margin:0;color:var(--muted);font-size:13px;line-height:1.5}.insight.good strong{color:var(--green)}.insight.warn strong{color:var(--amber)}
.tabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:15px}.tab{border:1px solid var(--line);background:#fff;border-radius:9px;padding:8px 12px;font-weight:800;cursor:pointer}.tab.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.config-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.config-card{border:1px solid var(--line);border-radius:12px;padding:14px}.config-card h3{font-size:14px;margin:0 0 9px}.config-card pre{margin:0;background:#172033;color:#dce7f7;padding:12px;border-radius:9px;white-space:pre-wrap;overflow:auto;font:12px/1.55 Consolas,monospace}
.requirements-head{display:flex;justify-content:space-between;align-items:center;margin:22px 0 12px}.requirements-head p{margin:0;color:var(--muted)}
.requirements-table input,.requirements-table select{min-width:145px;padding:9px 10px}.remove-row{width:34px;height:34px;border:1px solid var(--line);background:#fff;border-radius:8px;color:var(--red);cursor:pointer;font-size:18px}
.switch-row{display:flex;align-items:center;gap:9px;min-height:46px;border:1px solid #cbd6e5;border-radius:10px;padding:10px 12px;font-size:14px;font-weight:700}.switch-row input{width:auto;accent-color:var(--blue)}
.allocation-bar{display:flex;min-height:88px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#eef1f6}.segment{min-width:3px;display:flex;align-items:center;justify-content:center;padding:5px;border-right:1px solid rgba(255,255,255,.55);color:#fff;font-size:11px;font-weight:850;text-align:center;overflow:hidden;transition:width .55s ease}
.segment.free{background:repeating-linear-gradient(135deg,#e5eaf1,#e5eaf1 8px,#f3f5f8 8px,#f3f5f8 16px);color:#667085}.legend{display:flex;flex-wrap:wrap;gap:8px 14px;margin-top:14px}.legend span{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:12px;font-weight:700}.legend i{width:10px;height:10px;border-radius:3px}
.step-card{padding:20px;border-radius:14px;background:var(--surface-2);border:1px solid #cfe0fc}.step-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:15px}.step-detail{background:#fff;border:1px solid #d8e4f5;border-radius:10px;padding:12px}.step-detail span{display:block;color:var(--muted);font-size:11px;margin-bottom:5px}.step-controls{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.step-controls span{min-width:88px;text-align:center;color:var(--muted);font-size:12px;font-weight:800}
.learn-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.learn-card{border:1px solid var(--line);border-radius:13px;padding:17px;background:#fbfcfe}.learn-card b{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--surface-2);color:var(--blue);margin-bottom:12px}.learn-card h3{font-size:15px}.learn-card p{color:var(--muted);font-size:13px;line-height:1.55}
.formula{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0}.formula>div{padding:16px;border-radius:12px;background:#172033;color:#fff}.formula code{font:14px/1.55 Consolas,monospace}.formula strong{display:block;color:#b8c6dc;font-size:12px;margin-bottom:9px}
details{border-top:1px solid var(--line);padding:15px 2px}summary{cursor:pointer;font-weight:850}details p{color:var(--muted);line-height:1.65}.field-label{display:block;font-size:13px;font-weight:800;margin-bottom:7px}.helper-text{margin:10px 0 0;color:var(--muted);font-size:13px;line-height:1.55}.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.summary-card{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fbfcfe}.summary-card h3{font-size:15px;margin:0 0 10px}.route-list{display:grid;gap:8px}.route-item{padding:10px 12px;border-radius:10px;background:#fff;border:1px solid #dfe7f2;color:#22324d;font-weight:800;font-family:Consolas,monospace;word-break:break-all}.warning-box{margin-top:14px;padding:12px 14px;border-radius:10px;border:1px solid #f5dcb1;background:#fff8eb;color:#8c5d00;font-weight:700;line-height:1.5}textarea{width:100%;border:1px solid #cfd8e6;border-radius:10px;padding:12px;font:700 14px ui-monospace,monospace;resize:vertical}
@media(max-width:900px){.input-grid,.config-grid,.summary-grid{grid-template-columns:repeat(2,1fr)}.details-grid,.learn-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.summary-grid{grid-template-columns:1fr}}
@media(max-width:650px){.tool-header,.requirements-head{flex-direction:column}.input-grid,.config-grid,.details-grid,.insights-grid,.learn-grid,.formula,.step-grid{grid-template-columns:1fr}.requirements-table th:nth-child(3),.requirements-table td:nth-child(3){display:none}}
.seo-panel{margin-top:22px}
.seo-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.seo-card{border:1px solid var(--line);border-radius:14px;padding:18px;background:#fbfcfe}
.seo-card h3{font-size:16px;margin:0 0 8px}
.seo-card p,.seo-card li{color:var(--muted);line-height:1.6}
.seo-list{margin:0;padding-left:18px;display:grid;gap:8px}
.seo-table-wrap{overflow:auto}
.seo-table{width:100%;border-collapse:collapse;margin-top:10px;font-size:13px;min-width:560px}
.seo-table th,.seo-table td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.seo-table th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.seo-note{margin-top:12px;color:var(--muted);font-size:13px;line-height:1.55}
.code-block{margin:10px 0 0;padding:12px;border-radius:10px;background:#172033;color:#e7eefb;overflow:auto;font:13px/1.6 Consolas,monospace;white-space:pre-wrap}
.faq-list{display:grid;gap:10px}
.faq-list details{border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fbfcfe}
.faq-list summary{cursor:pointer;font-weight:850}
.faq-list p{margin:8px 0 0;color:var(--muted);line-height:1.6}
@media(max-width:900px){.seo-grid{grid-template-columns:1fr}}
@media(max-width:650px){.seo-table{min-width:100%}}

.tool-app .input-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.tool-app .result-actions{display:flex;gap:9px;flex-wrap:wrap;margin:12px 0 0}
.tool-app .mono{font-family:Consolas,monospace}
.tool-app .result-block{border:1px solid var(--line);border-radius:12px;padding:14px;background:#fbfcfe}
.tool-app .result-block h3{margin:0 0 8px;font-size:15px}
.tool-app .result-list{display:grid;gap:8px}
.tool-app .result-item{padding:10px 12px;border:1px solid #dfe7f2;border-radius:10px;background:#fff}
.tool-app .table-wrap table td.wrap{white-space:normal}
.tool-app .callout-note{margin-top:12px;padding:11px 13px;border-radius:10px;border:1px solid #d4e1f8;background:#f5f9ff;color:#23406f;font-size:13px;line-height:1.5}
.tool-app .chips{display:flex;flex-wrap:wrap;gap:8px}
.tool-app .chip{display:inline-flex;align-items:center;padding:6px 10px;border:1px solid #d9e3f2;border-radius:999px;background:#fff;font-size:12px;font-weight:800;color:#274067}

@media(max-width:900px){.tool-app .input-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:650px){.tool-app .input-grid{grid-template-columns:1fr}}

/* ACL Builder and IPv6 Calculator */
.acl-settings-grid{grid-template-columns:repeat(3,1fr)}
.ace-list{display:grid;gap:14px}
.ace-card{border:1px solid var(--line);border-radius:14px;padding:14px;background:#fbfcfe}
.ace-header{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px}
.ace-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.checkbox-line{display:flex;align-items:center;gap:8px;min-height:42px;border:1px solid var(--line);border-radius:10px;padding:0 10px;background:#fff}
.checkbox-line input{width:auto;accent-color:var(--blue)}
.btn.small{padding:6px 10px;font-size:12px}
.copy-value{cursor:pointer}
.copy-value:hover{text-decoration:underline}

@media(max-width:1000px){.acl-settings-grid,.ace-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:650px){.acl-settings-grid,.ace-grid{grid-template-columns:1fr}}