/* ==========================================================================
   Subnet Splitter page. Enqueued only via is_page('subnet-splitter'). Self-
   contained per the site's per-page-stylesheet convention: every shared class
   this page's markup uses is fully defined here, not just referenced.
   ========================================================================== */

.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---- shared control primitives ---- */
.subnet-field label{display:block;font-size:12.5px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:6px}
.subnet-field input,.subnet-field select{width:100%;height:52px;padding:0 16px;border:1px solid var(--border);border-radius:var(--radius-sm);font:600 16px/1 var(--font-mono);color:var(--ink);background:var(--white)}
.subnet-field input:focus-visible,.subnet-field select:focus-visible{outline:3px solid var(--blue);outline-offset:1px;border-color:var(--blue)}
.subnet-input-hint{font-size:12.5px;color:var(--muted);margin:8px 0 0;line-height:1.5}
.subnet-input-hint a{color:var(--blue);text-decoration:underline}

.subnet-error{margin-top:14px;padding:13px 16px;border:1px solid #F3C6C1;background:#FDF2F1;border-radius:var(--radius-sm);color:var(--red);font-size:14px;font-weight:600}
.subnet-error[hidden]{display:none}

.subnet-explain{margin-top:0;padding:0;background:none;color:var(--ink);font-size:14.5px;line-height:1.6}

.subnet-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--teal);margin-bottom:12px}
.subnet-eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--teal);flex:none}
.subnet-hero-lede{color:var(--muted);font-size:16.5px;line-height:1.55;margin:0 0 8px;max-width:640px}

.subnet-btn{height:50px;padding:0 22px;border-radius:999px;border:0;background:var(--blue);color:var(--white);font-weight:700;font-size:14.5px;font-family:ui-sans-serif,sans-serif;cursor:pointer;transition:background .15s}
.subnet-btn:hover,.subnet-btn:focus-visible{background:#1D4FC4}
.subnet-btn:disabled{background:var(--border);color:var(--muted);cursor:not-allowed}
.subnet-btn.subnet-btn-ghost{background:var(--white);border:1px solid var(--border);color:var(--ink)}
.subnet-btn.subnet-btn-ghost:hover,.subnet-btn.subnet-btn-ghost:focus-visible{border-color:var(--blue);color:var(--blue);background:#EAF1FE}
.subnet-btn.subnet-btn-ghost:disabled{background:var(--white);border-color:var(--border);color:var(--border)}

.subnet-btn-tertiary{height:auto;padding:10px 14px;border:1px solid var(--border);border-radius:999px;background:var(--white);color:var(--muted);font-weight:600;font-size:13px;font-family:ui-sans-serif,sans-serif;cursor:pointer}
.subnet-btn-tertiary:hover,.subnet-btn-tertiary:focus-visible{color:var(--blue);border-color:#BFD3F7;background:#EAF1FE}
.subnet-btn-tertiary:disabled{color:var(--border);cursor:not-allowed}

.subnet-family-toggle{display:inline-flex;flex-wrap:wrap;gap:4px;background:var(--bg);border:1px solid var(--border);border-radius:999px;padding:4px}
.subnet-family-toggle label{position:relative;font-size:13px;font-weight:600;color:var(--muted);padding:8px 16px;border-radius:999px;cursor:pointer}
.subnet-family-toggle input{position:absolute;opacity:0;width:1px;height:1px}
.subnet-family-toggle label:has(input:checked){background:var(--navy);color:var(--white)}
.subnet-family-toggle input:focus-visible ~ span{outline:3px solid var(--blue);outline-offset:2px;border-radius:999px}

.subnet-disclosure{margin-top:14px;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;background:var(--white)}
.subnet-disclosure summary{list-style:none;cursor:pointer;padding:15px 18px;font-size:14px;font-weight:700;color:var(--navy);display:flex;align-items:center;justify-content:space-between;background:var(--bg)}
.subnet-disclosure summary::-webkit-details-marker{display:none}
.subnet-disclosure summary::after{content:"+";font-size:18px;color:var(--muted);flex:none}
.subnet-disclosure[open] summary::after{content:"\2212"}
.subnet-disclosure summary:focus-visible{outline:3px solid var(--blue);outline-offset:-3px}
.subnet-disclosure-body{padding:18px}

.subnet-adv-grid{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}
.subnet-adv-row{display:flex;justify-content:space-between;gap:10px;padding:12px 15px;border-bottom:1px solid var(--border);font-size:13.5px}
.subnet-adv-row:nth-child(odd){border-right:1px solid var(--border)}
.subnet-adv-row .subnet-adv-label{color:var(--muted);font-weight:600}
.subnet-adv-row .subnet-adv-value{font-family:var(--font-mono);color:var(--ink);text-align:right;word-break:break-word}

.subnet-table-wrap{overflow-x:auto;border-radius:10px;border:1px solid var(--border)}
.subnet-table-wrap table{width:100%;border-collapse:collapse;font-size:13.5px}
.subnet-table-wrap thead th{background:var(--navy);color:var(--white);font-size:12px;letter-spacing:.03em;font-weight:700;padding:12px 14px;text-align:left;white-space:nowrap}
.subnet-table-wrap td{padding:12px 14px;border-bottom:1px solid var(--border);color:var(--ink);font-family:var(--font-mono)}
.subnet-table-wrap tbody tr:nth-child(even){background:var(--bg)}
.subnet-table-wrap tbody tr:last-child td{border-bottom:none}
.subnet-table-wrap tbody tr.is-selected-row{background:#EAF1FE}

/* ---- hero ---- */
.vlsm-hero{padding:100px 0 28px;background:var(--white)}
.vlsm-breadcrumb{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted);margin-bottom:20px}
.vlsm-breadcrumb a{color:var(--muted)}
.vlsm-breadcrumb a:hover,.vlsm-breadcrumb a:focus-visible{color:var(--blue)}
.vlsm-breadcrumb [aria-current]{color:var(--ink);font-weight:600}
.vlsm-hero-head{max-width:800px}
.vlsm-hero-head h1{font-size:clamp(26px,3.1vw,38px);color:var(--navy);margin:0 0 12px;line-height:1.18}
.vlsm-hero-note{font-size:13px;color:var(--muted);margin:0}

/* ---- tool shell ---- */
.vlsm-tool{padding:0 0 56px;background:var(--white)}
.vlsm-tool-shell{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-md);padding:0;overflow:hidden}
.vlsm-tool-section{padding:20px 28px}
.vlsm-tool-section + .vlsm-tool-section{border-top:1px solid var(--border)}
.vlsm-tool-section-tint{background:var(--bg)}
.vlsm-section-heading{font-size:13px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin:0 0 16px}
.vlsm-base-row{max-width:420px}
.vlsm-normalized-note{margin:10px 0 0;padding:10px 14px;border-radius:var(--radius-sm);background:#EAF1FE;border:1px solid #BFD3F7;color:#1D4FC4;font-size:13px;font-weight:600}
.vlsm-normalized-note[hidden]{display:none}
.vlsm-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}

/* ---- splitter mode panels ---- */
.splitter-mode-panel[hidden]{display:none}
.splitter-mode-field{max-width:320px}
.splitter-mode-preview{margin:10px 0 0;padding:10px 14px;border-radius:var(--radius-sm);background:var(--white);border:1px solid var(--border);font-size:13px;color:var(--ink);line-height:1.6}
.splitter-mode-preview[hidden]{display:none}
.splitter-mode-preview b{font-family:var(--font-mono);color:var(--navy)}

/* ---- empty state ---- */
.splitter-empty-state{margin:0;padding:16px 18px;border:1px dashed var(--border);border-radius:var(--radius-sm);color:var(--muted);font-size:14px;line-height:1.55;background:var(--bg)}
.splitter-empty-state[hidden]{display:none}
.splitter-empty-state strong{display:block;color:var(--ink);font-size:14.5px;margin-bottom:2px}

/* ---- results ---- */
.vlsm-results[hidden]{display:none}
.vlsm-status-line{display:none}

/* ---- verdict hero ---- */
.splitter-verdict{padding:15px 20px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg);margin-bottom:16px}
.splitter-verdict-eyebrow{display:block;font-size:11.5px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:4px}
.splitter-verdict-main{font-size:21px;font-weight:700;color:var(--navy);margin:0 0 6px;line-height:1.3}
.splitter-verdict-main code{font-family:var(--font-mono);background:none;border:0;padding:0;font-size:inherit;color:inherit}
.splitter-verdict-support{margin:0;font-size:13.5px;color:var(--ink);font-weight:600}

/* ---- 4-up metric strip ---- */
.splitter-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;margin-bottom:16px}
.splitter-metric{padding:14px 16px;border-right:1px solid var(--border);background:var(--white);display:flex;flex-direction:column;gap:6px}
.splitter-metric:last-child{border-right:0}
.splitter-metric-label{font-size:11px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.03em}
.splitter-metric-value{font:700 18px var(--font-mono);color:var(--navy);word-break:break-word}

/* ---- exact partition strip ---- */
.splitter-partition{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:12px 16px;border-radius:var(--radius-sm);border:1px solid #BFE3DC;background:#EAF7F5;margin-bottom:18px}
.splitter-partition-title{font-size:13.5px;font-weight:700;color:#0F5C51;flex:1 1 auto;min-width:180px}
.splitter-partition-stats{display:flex;gap:18px;flex-wrap:wrap}
.splitter-partition-stat{display:flex;flex-direction:column;gap:1px}
.splitter-partition-stat span{font-size:10.5px;color:#3E7267;font-weight:700;text-transform:uppercase;letter-spacing:.03em}
.splitter-partition-stat b{font:700 14px var(--font-mono);color:#0F5C51}

/* ---- subnet map (single-color + selection state; no per-index rainbow) ---- */
.splitter-map-intro{font-size:13px;color:var(--muted);margin:0 0 10px}
.splitter-map{display:flex;flex-wrap:wrap;gap:2px;min-height:56px;border-radius:10px;overflow:hidden}
.splitter-map.splitter-map-note{display:block;padding:16px 18px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--muted);font-size:13.5px;line-height:1.6}
.splitter-map-seg{display:flex;flex-direction:column;align-items:center;justify-content:center;font:600 11.5px var(--font-mono);color:var(--white);background:var(--blue);border:0;cursor:pointer;padding:6px;overflow:hidden;white-space:nowrap;min-width:44px;flex:1 1 0;position:relative}
.splitter-map-seg:hover{background:#1D4FC4}
.splitter-map-seg:focus-visible{outline:3px solid var(--ink);outline-offset:-3px}
.splitter-map-seg b{font-size:12px;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.splitter-map-seg span{font-size:10px;opacity:.85}
.splitter-map-seg.is-selected{background:var(--navy);box-shadow:inset 0 0 0 3px var(--white),inset 0 0 0 5px var(--teal)}
.splitter-map-seg.is-selected::after{content:"\2713";position:absolute;top:3px;right:5px;font-size:10px;font-weight:700}

/* ---- boundary ruler ---- */
.splitter-ruler{margin-top:6px}
.splitter-ruler-ticks{display:flex;justify-content:space-between;position:relative;margin-top:22px}
.splitter-ruler-tick{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:10.5px;color:var(--muted);flex:1 1 0;min-width:0}
.splitter-ruler-tick::before{content:"";width:2px;height:8px;background:var(--blue);margin-top:-27px;border-radius:1px}
.splitter-ruler-tick b{font:700 11px var(--font-mono);color:var(--navy);white-space:nowrap}
.splitter-ruler-tick.is-ellipsis{color:var(--border);font-weight:700}
.splitter-ruler-tick.is-ellipsis::before{background:var(--border)}
.splitter-ruler-caption{margin:10px 0 0;font-size:12.5px;color:var(--muted);line-height:1.5}
.splitter-ruler-caption b{font-family:var(--font-mono);color:var(--ink)}

/* ---- prefix transformation ---- */
.splitter-transform{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:16px 18px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);margin-bottom:10px}
.splitter-transform-block{display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center}
.splitter-transform-block b{font:700 20px var(--font-mono);color:var(--navy)}
.splitter-transform-block span{font-size:11px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.03em}
.splitter-transform-arrow{display:flex;flex-direction:column;align-items:center;gap:2px;color:var(--muted);flex:1 1 auto;min-width:90px}
.splitter-transform-arrow b{font-size:12px;color:var(--teal);font-weight:700;white-space:nowrap}
.splitter-transform-arrow-line{width:100%;height:1px;background:var(--border);position:relative}
.splitter-transform-arrow-line::after{content:"\2192";position:absolute;right:-2px;top:-9px;color:var(--border)}
.splitter-transform-formulas{display:flex;gap:18px;flex-wrap:wrap;margin-top:4px;font-size:12.5px;color:var(--muted)}
.splitter-transform-formulas b{font-family:var(--font-mono);color:var(--ink)}

/* ---- nearby split options ---- */
.splitter-options{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.splitter-option{padding:14px 16px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--white);text-align:center;cursor:pointer;font-family:inherit}
.splitter-option:hover,.splitter-option:focus-visible{border-color:var(--blue);background:#EAF1FE}
.splitter-option.is-selected{border-color:var(--navy);background:var(--navy)}
.splitter-option.is-selected .splitter-option-prefix,.splitter-option.is-selected .splitter-option-tag{color:var(--white)}
.splitter-option.is-selected .splitter-option-stat{color:#C7D3E8}
.splitter-option-prefix{display:block;font:700 20px var(--font-mono);color:var(--navy);margin-bottom:2px}
.splitter-option-tag{display:block;font-size:10.5px;font-weight:700;text-transform:uppercase;letter-spacing:.03em;color:var(--teal);margin-bottom:8px;min-height:13px}
.splitter-option-stat{display:block;font-size:12.5px;color:var(--muted);line-height:1.6}
.splitter-option-stat b{color:var(--ink);font-family:var(--font-mono)}

/* ---- navigator ---- */
.splitter-navigator-row{display:flex;gap:12px;align-items:end;flex-wrap:wrap;margin-top:6px}
.splitter-navigator-field{flex:1 1 220px;max-width:320px}
.splitter-navigator-viewing{font-size:12.5px;color:var(--muted);margin:0 0 10px}
.splitter-navigator-viewing b{font-family:var(--font-mono);color:var(--ink)}

/* ---- inspector ---- */
.vlsm-detail-panel{margin-top:14px;padding:18px 20px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);min-height:1px}
.vlsm-detail-panel-empty{font-size:13px;color:var(--muted)}
.vlsm-detail-title{font-size:15px;font-weight:700;color:var(--navy);margin:0 0 4px}
.vlsm-detail-cidr{font:700 14px var(--font-mono);color:var(--ink);margin:0 0 14px;display:block}
.vlsm-detail-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 20px}
.vlsm-detail-row{display:flex;flex-direction:column;gap:3px}
.vlsm-detail-label{font-size:11px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.03em}
.vlsm-detail-value{font:600 13.5px var(--font-mono);color:var(--ink)}
.splitter-inspector-nav{display:flex;justify-content:space-between;gap:10px;margin-top:12px}

/* ---- table controls / pagination ---- */
.vlsm-table-controls{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-top:28px;margin-bottom:10px}
.vlsm-order-note{font-size:12.5px;color:var(--muted);font-weight:600}
.splitter-pagination{display:flex;gap:8px}
.vlsm-advanced-columns-label{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted);font-weight:600;cursor:pointer;margin-top:10px}

.vlsm-table-wrap table{min-width:640px}
.vlsm-col-advanced{display:none}
body.vlsm-show-advanced .vlsm-col-advanced{display:table-cell}

.vlsm-export-actions{margin-top:28px;padding-top:24px;border-top:1px solid var(--border)}

/* ---- reduced motion ---- */
@media(prefers-reduced-motion:reduce){
	.splitter-map-seg,.subnet-btn{transition:none!important}
}

/* ---- responsive ---- */
@media(max-width:1050px){
	.vlsm-hero{padding-top:96px}
	.splitter-metrics{grid-template-columns:1fr 1fr}
	.splitter-metric{border-bottom:1px solid var(--border)}
	.splitter-metric:nth-child(2n){border-right:0}
	.vlsm-detail-grid{grid-template-columns:1fr 1fr}
	.splitter-options{grid-template-columns:1fr 1fr 1fr}
}
@media(max-width:768px){
	.vlsm-tool-section{padding:18px 20px}
	.splitter-navigator-row{flex-direction:column;align-items:stretch}
	.splitter-navigator-field{max-width:none}
	.splitter-verdict-main{font-size:18px}
	.splitter-transform{flex-direction:column;align-items:stretch}
	.splitter-transform-arrow{min-width:0}
	.splitter-transform-arrow-line::after{display:none}
}
@media(max-width:620px){
	.vlsm-hero{padding:84px 0 24px}
	.splitter-metrics{grid-template-columns:1fr}
	.splitter-metric{border-right:0!important;border-bottom:1px solid var(--border)}
	.splitter-metric:last-child{border-bottom:0}
	.splitter-options{grid-template-columns:1fr}
	.splitter-map-seg{flex:1 1 45%;min-height:44px}
	.vlsm-detail-grid{grid-template-columns:1fr}
	.vlsm-table-controls{flex-direction:column;align-items:flex-start}
	.splitter-partition{flex-direction:column;align-items:flex-start}
	.splitter-ruler-ticks{overflow-x:auto}
}

/* ---- guide / educational content ---- */
.subnet-guide{padding:56px 0;background:var(--bg)}
.subnet-guide-inner{max-width:820px;margin:0 auto}
.subnet-guide h2{font-size:24px;color:var(--navy);margin:44px 0 14px}
.subnet-guide h2:first-child{margin-top:0}
.subnet-guide p{color:var(--ink);font-size:15.5px;line-height:1.65;margin:0 0 14px;max-width:74ch}
.subnet-guide p a{color:var(--blue);text-decoration:underline}
.subnet-guide code{font-family:var(--font-mono);background:var(--white);border:1px solid var(--border);border-radius:4px;padding:1px 6px;font-size:.92em}