/* FusionDrive documentation — shared stylesheet
   Used by every page under /docs/. Class names are stable and generic:
   .doc .toc .callout(.note|.caution|.warning) .steps .spec-table .pin-table .figure .badge .grid2 */

:root{
  --pink:#F0587A;--pink2:#FF7A98;--pink-dim:rgba(240,88,122,.12);
  --ok:#15803D;--warn:#B45309;--danger:#B91C1C;
  --bg:#FAFAFB;--paper:#FFFFFF;--paper2:#F4F4F6;
  --ink:#111114;--ink2:#3F3F46;--ink3:#71717A;
  --rule:rgba(17,17,20,.09);--rule2:rgba(17,17,20,.16);
  --code:#F1F1F3;
  --d:'Unbounded',system-ui,sans-serif;--b:'Instrument Sans',system-ui,sans-serif;
  --r:14px;--header-h:64px;--toc-w:260px;--content-w:820px;
  --shadow:0 20px 50px -30px rgba(17,17,20,.25);
  color-scheme:light;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 20px);background:var(--bg)}
body{font-family:var(--b);background:var(--bg);color:var(--ink);line-height:1.6;font-size:16.5px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg{display:block;max-width:100%}
a{color:var(--pink);text-decoration:none}
a:hover{text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:3px}
:focus-visible{outline:3px solid var(--pink);outline-offset:3px;border-radius:6px}
::selection{background:var(--pink);color:#fff}
h1,h2,h3,h4{font-family:var(--d);letter-spacing:-.02em;line-height:1.15;color:var(--ink);font-weight:700}
h1{font-size:clamp(28px,4vw,40px);font-weight:800;letter-spacing:-.03em;margin:0 0 14px}
h2{font-size:clamp(21px,2.6vw,26px);margin:52px 0 16px;padding-top:6px}
h3{font-size:17px;margin:32px 0 10px}
h4{font-size:15px;font-family:var(--b);font-weight:700;margin:22px 0 8px;color:var(--ink)}
p{margin:0 0 14px}
ul,ol{margin:0 0 16px 22px}
li{margin:4px 0}
li>ul,li>ol{margin-top:6px;margin-bottom:6px}
strong{font-weight:600}
small{font-size:13.5px;color:var(--ink3)}
hr{border:0;border-top:1px solid var(--rule);margin:36px 0}
kbd{font:inherit;font-size:.9em;padding:1px 7px;border:1px solid var(--rule2);border-bottom-width:2px;border-radius:6px;background:var(--paper2)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;height:var(--header-h);background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(16px) saturate(1.2);-webkit-backdrop-filter:blur(16px) saturate(1.2);border-bottom:1px solid var(--rule)}
.site-header .inner{height:100%;display:flex;align-items:center;gap:22px;padding:0 clamp(16px,3vw,32px)}
.site-header .brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;flex-shrink:0}
.site-header .brand img{height:28px;width:auto}
.site-header .brand .sep{width:1px;height:22px;background:var(--rule2)}
.site-header .brand .lbl{font-family:var(--d);font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink3);font-weight:600}
.site-header nav{margin-left:auto;display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.site-header nav::-webkit-scrollbar{display:none}
.site-header nav a{white-space:nowrap;padding:8px 13px;border-radius:999px;font-size:14.5px;font-weight:500;color:var(--ink2);text-decoration:none;transition:background .15s,color .15s}
.site-header nav a:hover{background:var(--paper2);color:var(--ink);text-decoration:none}
.site-header nav a[aria-current=page]{background:var(--ink);color:var(--bg);font-weight:600}
.site-header .home{font-size:14px;color:var(--ink3);text-decoration:none;white-space:nowrap;flex-shrink:0}
.site-header .home:hover{color:var(--ink)}
@media (max-width:720px){.site-header .brand .lbl,.site-header .brand .sep,.site-header .home{display:none}.site-header .inner{gap:12px}}

/* ---------- layout ---------- */
.layout{display:grid;grid-template-columns:var(--toc-w) minmax(0,1fr);gap:clamp(20px,4vw,56px);width:min(1240px,100%);margin:0 auto;padding:36px clamp(16px,3vw,32px) 90px}
.layout.no-toc{grid-template-columns:minmax(0,1fr)}
@media (max-width:900px){.layout{grid-template-columns:1fr;padding-top:18px;gap:18px}}

/* ---------- sidebar TOC ---------- */
.toc{position:sticky;top:calc(var(--header-h) + 24px);align-self:start;max-height:calc(100vh - var(--header-h) - 48px);overflow:auto;font-size:14px;scrollbar-width:thin;padding-right:6px}
.toc details{border:0}
.toc summary{list-style:none;cursor:default;font-family:var(--d);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink3);font-weight:600;padding:0 0 10px 12px}
.toc summary::-webkit-details-marker{display:none}
.toc ul{list-style:none;margin:0;padding:0;border-left:1px solid var(--rule)}
.toc li{margin:0}
.toc li a{display:block;padding:6px 12px;color:var(--ink2);text-decoration:none;border-left:2px solid transparent;margin-left:-1px;line-height:1.4;transition:color .15s,border-color .15s}
.toc li a:hover{color:var(--ink);text-decoration:none}
.toc li a.on,.toc li a[aria-current]{color:var(--pink);border-left-color:var(--pink);font-weight:600}
.toc li li a{padding-left:24px;font-size:13.2px;color:var(--ink3)}
.toc .toc-links{margin-top:22px;border-left:0;padding-left:12px}
.toc .toc-links a{padding-left:0;border-left:0;font-size:13.5px}
@media (max-width:900px){
  .toc{position:static;max-height:none;overflow:visible;padding:0}
  .toc details{background:var(--paper);border:1px solid var(--rule);border-radius:var(--r);padding:12px 16px}
  .toc summary{cursor:pointer;padding:0;display:flex;align-items:center;justify-content:space-between}
  .toc summary::after{content:"+";font-size:18px;line-height:1;color:var(--ink3)}
  .toc details[open] summary{padding-bottom:10px}
  .toc details[open] summary::after{content:"–"}
  .toc ul{border-left:0}
  .toc li a{border-left:0;padding-left:0;margin-left:0}
  .toc li li a{padding-left:14px}
}

/* ---------- document ---------- */
.doc{max-width:var(--content-w);min-width:0}
.doc .eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--pink);margin-bottom:14px}
.doc .eyebrow::before{content:"";width:22px;height:2px;background:currentColor;border-radius:2px}
.doc .lead{font-size:clamp(17px,1.3vw,19px);color:var(--ink2);margin-bottom:26px;max-width:60ch}
.doc .meta{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--ink3);margin:0 0 30px;padding-bottom:22px;border-bottom:1px solid var(--rule)}
/* ---------- PDF download buttons ---------- */
.doc-actions{display:flex;flex-wrap:wrap;gap:10px;margin:-14px 0 30px}
.btn-pdf{display:inline-flex;align-items:center;gap:10px;padding:9px 16px 9px 13px;border-radius:12px;background:var(--ink);color:var(--bg);text-decoration:none;font-size:14px;font-weight:600;line-height:1.15;border:1px solid var(--ink);transition:transform .2s,box-shadow .2s}
.btn-pdf:hover{text-decoration:none;transform:translateY(-1px);box-shadow:var(--shadow)}
.btn-pdf svg{flex-shrink:0;color:var(--pink2)}
.btn-pdf small{display:block;font-size:11.5px;font-weight:500;opacity:.72;margin-top:2px}
.btn-pdf.ghost{background:var(--paper);color:var(--ink);border-color:var(--rule2)}
.btn-pdf.ghost svg{color:var(--pink)}
.dl-list{list-style:none;margin:0;padding:0}
.dl-list li{display:flex;align-items:center;gap:14px;padding:12px 0;border-top:1px solid var(--rule)}
.dl-list li:first-child{border-top:0;padding-top:0}
.dl-list .pdfic{width:38px;height:44px;flex-shrink:0;border-radius:6px;background:var(--ink);color:var(--pink2);display:grid;place-items:center;font-family:var(--d);font-size:9.5px;font-weight:700;letter-spacing:.06em}
.dl-list b{display:block;font-size:15px}
.dl-list small{display:block;color:var(--ink3);font-size:13px}
.dl-list a{margin-left:auto;white-space:nowrap;font-weight:600;font-size:14px}
.doc h2 .anchor,.doc h3 .anchor{opacity:0;margin-left:8px;color:var(--ink3);font-weight:400;font-family:var(--b);text-decoration:none}
.doc h2:hover .anchor,.doc h3:hover .anchor{opacity:1}
.doc table{width:100%;border-collapse:collapse;font-size:14.5px;margin:14px 0 24px}
.doc th,.doc td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--rule);vertical-align:top}
.doc th{font-weight:600;color:var(--ink);background:var(--paper2);font-size:13.5px}
.doc tr:last-child td{border-bottom:0}
.table-wrap{overflow-x:auto;border:1px solid var(--rule);border-radius:var(--r);background:var(--paper);margin:14px 0 26px;-webkit-overflow-scrolling:touch}
.table-wrap table{margin:0;min-width:520px}
.spec-table th:first-child{width:34%;color:var(--ink2);font-weight:600}
.spec-table td{color:var(--ink)}
.spec-table td .sub{display:block;font-size:13px;color:var(--ink3);margin-top:2px}
.pin-table th:first-child,.pin-table td:first-child{width:56px;text-align:center;font-family:var(--d);font-size:13px;font-weight:700}
.pin-table td .lbl{display:inline-block;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px;padding:2px 8px;border-radius:6px;background:var(--code);border:1px solid var(--rule);white-space:nowrap}
.swatch{display:inline-flex;align-items:center;gap:8px;white-space:nowrap}
.swatch::before{content:"";width:14px;height:14px;border-radius:4px;background:var(--c,#888);border:1px solid rgba(0,0,0,.25);box-shadow:inset 0 0 0 1px rgba(255,255,255,.25);flex-shrink:0}
.num{font-variant-numeric:tabular-nums}

/* ---------- badges ---------- */
.badge{display:inline-block;font-family:var(--d);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;font-weight:700;padding:4px 9px;border-radius:999px;background:var(--pink-dim);color:var(--pink);vertical-align:middle;white-space:nowrap}
.badge.grey{background:var(--paper2);color:var(--ink2);border:1px solid var(--rule)}
.badge.ok{background:rgba(21,128,61,.12);color:var(--ok)}
.badge.warn{background:rgba(180,83,9,.12);color:var(--warn)}
.badge.danger{background:rgba(185,28,28,.12);color:var(--danger)}

/* ---------- callouts ---------- */
.callout{position:relative;display:grid;grid-template-columns:26px 1fr;gap:12px;padding:16px 18px 16px 16px;border-radius:var(--r);border:1px solid var(--rule);background:var(--paper);margin:20px 0 24px;font-size:15px}
.callout>svg,.callout>.ico{width:22px;height:22px;margin-top:2px;color:var(--ink3);flex-shrink:0}
.callout .body{min-width:0}
.callout .body>:last-child{margin-bottom:0}
.callout .title{display:block;font-family:var(--d);font-size:12px;letter-spacing:.1em;text-transform:uppercase;font-weight:700;margin-bottom:6px}
.callout.note{border-color:rgba(59,130,246,.35);background:color-mix(in srgb,#3B82F6 6%,var(--paper))}
.callout.note .title,.callout.note>svg{color:#2563EB}
.callout.caution{border-color:rgba(245,158,11,.45);background:color-mix(in srgb,#F59E0B 8%,var(--paper))}
.callout.caution .title,.callout.caution>svg{color:var(--warn)}
.callout.warning{border-color:rgba(220,38,38,.45);background:color-mix(in srgb,#DC2626 7%,var(--paper))}
.callout.warning .title,.callout.warning>svg{color:var(--danger)}
.callout.tip{border-color:rgba(240,88,122,.4);background:color-mix(in srgb,var(--pink) 6%,var(--paper))}
.callout.tip .title,.callout.tip>svg{color:var(--pink)}

/* ---------- numbered steps ---------- */
.steps{list-style:none;margin:18px 0 28px;padding:0;counter-reset:step}
.steps>li{position:relative;padding:0 0 22px 52px;margin:0;counter-increment:step}
.steps>li::before{content:counter(step);position:absolute;left:0;top:-2px;width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--bg);font-family:var(--d);font-weight:700;font-size:14px;display:grid;place-items:center}
.steps>li::after{content:"";position:absolute;left:16.5px;top:36px;bottom:0;width:1px;background:var(--rule2)}
.steps>li:last-child::after{display:none}
.steps>li>b,.steps>li>strong:first-child{display:block;font-weight:600;font-size:16.5px;margin-bottom:4px;color:var(--ink)}
.steps>li p{margin-bottom:8px}
.steps>li .figure{margin:12px 0 4px}
.steps>li>ul{margin-bottom:6px}

/* ---------- figures ---------- */
.figure{margin:22px 0 28px;border:1px solid var(--rule);border-radius:var(--r);overflow:hidden;background:var(--paper)}
.doc img{max-width:100%;height:auto}
.figure img,.figure svg{width:100%;height:auto}
.figure.pad img{padding:18px}
.figure.plain{border:0;background:transparent;overflow:visible}
.figure figcaption{padding:10px 16px 12px;font-size:13.5px;color:var(--ink3);border-top:1px solid var(--rule);background:var(--paper)}
.figure.plain figcaption{border-top:0;background:transparent;padding-left:0;padding-right:0}
.figure svg text{font-family:var(--b)}
.diagram{background:var(--paper)}
.diagram svg{width:100%;height:auto;padding:10px}
/* shared classes for inline SVG wiring diagrams */
.diagram .w{fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.diagram .thin{stroke-width:1.6}
.diagram .thick{stroke-width:4}
.diagram .lab{font-size:12.5px;fill:var(--ink)}
.diagram .lab.b{font-weight:600}
.diagram .sm{font-size:11px;fill:var(--ink3)}
.diagram .ttl{font-family:var(--d);font-weight:700;font-size:14px;fill:var(--ink)}
.diagram .bx{fill:var(--paper2);stroke:var(--ink);stroke-width:1.6}
.diagram .pt{fill:var(--paper);stroke:var(--ink);stroke-width:1.4}
.diagram .ink{stroke:var(--ink)}
.diagram .inkf{fill:var(--ink)}
.diagram .dim{stroke:var(--ink3)}
.diagram .gnd{stroke:var(--ink);stroke-width:2;fill:none}
.diagram .pink{stroke:var(--pink)}
.diagram .pinkf{fill:var(--pink)}

/* ---------- grids / cards ---------- */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:18px 0 26px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:18px 0 26px}
@media (max-width:720px){.grid2,.grid3{grid-template-columns:1fr}}
.card{display:block;background:var(--paper);border:1px solid var(--rule);border-radius:var(--r);padding:22px;color:var(--ink);text-decoration:none;transition:transform .25s cubic-bezier(.2,.8,.2,1),box-shadow .25s,border-color .25s}
a.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--rule2);text-decoration:none}
.card .ic{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:var(--pink-dim);color:var(--pink);margin-bottom:14px}
.card h3{margin:0 0 6px;font-size:16px}
.card p{font-size:14.5px;color:var(--ink2);margin:0}
.card .more{display:inline-block;margin-top:12px;font-size:13.5px;font-weight:600;color:var(--pink)}
.card img{border-radius:10px;margin-bottom:14px;background:var(--paper2)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 18px;font-size:14.5px;margin:8px 0 18px}
.kv dt{color:var(--ink3);font-weight:500}
.kv dd{margin:0;color:var(--ink)}
.checklist{list-style:none;margin:10px 0 24px;padding:0}
.checklist li{position:relative;padding-left:32px;margin:8px 0}
.checklist li::before{content:"";position:absolute;left:0;top:3px;width:18px;height:18px;border-radius:5px;border:1.5px solid var(--rule2);background:var(--paper)}
.symptom{display:grid;grid-template-columns:1fr;gap:0;border:1px solid var(--rule);border-radius:var(--r);overflow:hidden;margin:16px 0 26px;background:var(--paper)}
.symptom>div{padding:14px 18px;border-top:1px solid var(--rule)}
.symptom>div:first-child{border-top:0;background:var(--paper2)}
.symptom .k{display:block;font-family:var(--d);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink3);margin-bottom:4px}
.pager{display:flex;justify-content:space-between;gap:16px;margin-top:64px;padding-top:26px;border-top:1px solid var(--rule)}
.pager a{display:block;padding:14px 18px;border:1px solid var(--rule);border-radius:var(--r);text-decoration:none;color:var(--ink);background:var(--paper);min-width:0;flex:1}
.pager a:hover{border-color:var(--rule2);box-shadow:var(--shadow)}
.pager a small{display:block;color:var(--ink3);font-size:12px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px}
.pager a b{font-family:var(--d);font-size:14px;font-weight:700}
.pager a.next{text-align:right}
.site-footer{border-top:1px solid var(--rule);padding:26px clamp(16px,3vw,32px);font-size:13.5px;color:var(--ink3);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;width:min(1240px,100%);margin:0 auto}
.site-footer a{color:var(--ink2)}
.hero-figure{border-radius:var(--r);overflow:hidden;background:radial-gradient(70% 90% at 50% 60%,var(--paper2),var(--bg) 80%);border:1px solid var(--rule);margin:0 0 30px}
.hero-figure img{width:100%;padding:16px}

/* ---------- print ---------- */
/* Print basics. The full branded print system (type, chips, callouts, tables, covers) lives in print.css,
   which every page loads with media="print"; build_pdfs.py composes the PDFs from the same rules. */
@media print{
  @page{size:A4;margin:24mm 14mm 20mm 14mm}
  .site-header,.toc,.pager,.site-footer,.no-print,.doc-actions{display:none!important}
  .layout{display:block;padding:0;width:auto}
  .doc{max-width:none}
  .doc h2,.doc h3{break-after:avoid;page-break-after:avoid}
  .figure,.callout,.symptom,tr{break-inside:avoid;page-break-inside:avoid}
  .table-wrap{border:0;overflow:visible}
  .table-wrap table{min-width:0}
}