/* ============================================================
   DiagMyPCHub — Upgrade from Windows 10 to Windows 11 in Place
   Local stylesheet. Depends on the site design tokens from
   ../../../css/style.css (loaded first in <head>). All page
   styles are namespaced with the "upg-" prefix so they cannot
   leak into shared site components. Shared components reused
   as-is: .table-wrap, .check-card/.check-list/.check-item,
   .chip-status, .btn, .to-top, .toast, .consent, footer parts.
   ============================================================ */

/* ---------- Reading progress ---------- */
.upg-progress{ position:fixed; top:0; left:0; right:0; height:3px; z-index:120; background:transparent; pointer-events:none; }
.upg-progress span{ display:block; height:100%; width:0; background:linear-gradient(90deg, var(--blue), var(--cyan-bright)); }

/* ---------- Grid: TOC + article ---------- */
.upg-grid{ display:grid; grid-template-columns:1fr; gap:36px; padding-top:clamp(28px,4vw,44px); padding-bottom:clamp(56px,8vw,96px); }

/* ---------- Table of contents (block on mobile, sticky sidebar on desktop) ---------- */
.upg-toc{ background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:16px 16px 12px; box-shadow:var(--shadow-1); }
p.upg-toc-title{ font:500 .7rem var(--font-mono); letter-spacing:.02em; color:var(--ink-3); margin:0 0 10px; }
.upg-toc-list{ margin:0; padding:0; list-style:none; border-top:1px solid var(--line); }
.upg-toc-group{ border-bottom:1px solid var(--line); }
.upg-toc-group:last-child{ border-bottom:0; }
.upg-toc-cat{ font:600 .78rem var(--font-body); color:var(--ink); margin:12px 0 6px; letter-spacing:.01em; }
.upg-toc-cat .mono{ color:var(--blue); margin-right:6px; font-size:.7rem; }
.upg-toc-group > ul{ list-style:none; margin:0; padding:0; display:grid; gap:1px; }
.upg-toc-item > a{ display:flex; gap:8px; align-items:baseline; padding:5px 10px; margin-left:-10px; border-left:2px solid transparent; color:var(--ink-2); text-decoration:none; font-size:.84rem; line-height:1.45; border-radius:0 8px 8px 0; transition:color .2s, border-color .2s, background .15s; }
.upg-toc-item > a:hover{ color:var(--ink); background:var(--tint); }
.upg-toc-item > a[aria-current="true"]{ color:var(--blue); border-left-color:var(--blue); font-weight:500; background:var(--tint); }
.upg-toc-num{ font:600 .7rem var(--font-mono); color:var(--ink-3); flex:none; width:1.9em; }
.upg-toc-item > a .upg-toc-title{ flex:1; }

/* ---------- Article head ---------- */
.upg-article{ max-width:860px; min-width:0; }
.upg-head h1{ font-size:clamp(1.8rem, 1.2rem + 2.4vw, 2.7rem); font-weight:700; letter-spacing:-.02em; line-height:1.12; margin:0 0 16px; }
.upg-meta{ display:flex; flex-wrap:wrap; align-items:center; gap:10px; margin:0 0 20px; }
.upg-meta-item{ font:500 .72rem var(--font-mono); letter-spacing:.04em; color:var(--ink-3); border:1px solid var(--line-2); background:var(--surface); border-radius:999px; padding:4px 10px; }
.upg-intro{ font-size:1.05rem; color:var(--ink-2); line-height:1.7; margin:0 0 16px; max-width:75ch; }

/* ---------- Prerequisites block ---------- */
.upg-prereq{ background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:clamp(14px,2.5vw,22px) clamp(14px,3vw,26px); margin:20px 0 8px; box-shadow:var(--shadow-1); }
.upg-prereq-list{ margin:0 0 14px; padding-left:22px; list-style:none; color:var(--ink-2); line-height:1.7; max-width:80ch; }
.upg-prereq-list li{ margin-bottom:8px; position:relative; padding-left:2px; }
.upg-prereq-list li::marker{ content:""; }
.upg-prereq-list li strong{ color:var(--ink); }

/* ---------- Hero SVG (original artwork, theme-aware) ---------- */
.upg-hero-fig{ margin:28px 0 8px; background:var(--surface); border:1px solid var(--line); border-radius:14px; padding:clamp(10px,2vw,20px); box-shadow:var(--shadow-1); }
.upg-hero-fig svg{ width:100%; height:auto; display:block; }
.upg-hero-cap{ margin-top:12px; font:400 .8rem/1.6 var(--font-mono); color:var(--ink-3); max-width:90ch; }

.upg-svg-boundary{ fill:none; stroke:var(--line-2); stroke-width:1.5; stroke-dasharray:6 8; }
.upg-svg-traces path{ stroke:var(--line-2); stroke-width:2; fill:none; }
.upg-svg-trace-idle{ stroke:var(--line-2) !important; stroke-dasharray:4 7; opacity:.55; }
.upg-svg-vias circle{ fill:var(--line-2); }
.upg-svg-core rect{ fill:var(--tint); stroke:var(--blue-soft); stroke-width:1.5; }
.upg-svg-led{ fill:var(--ok); animation:upgLed 2.6s ease-in-out infinite; }
@keyframes upgLed{ 0%,100%{ opacity:1; } 50%{ opacity:.35; } }
.upg-svg-chip rect{ fill:var(--surface); stroke:var(--line-2); stroke-width:1.5; }
.upg-svg-die{ fill:var(--tint) !important; stroke:var(--blue-soft) !important; }
.upg-svg-chip-target rect:first-child{ stroke:var(--blue); stroke-width:2; }
.upg-svg-chip-backup rect{ stroke:var(--ok); stroke-width:1.5; }
.upg-svg-label{ fill:var(--ink-3); font:600 11px var(--font-mono); letter-spacing:1px; }
.upg-svg-boundary-label{ font-size:10px; letter-spacing:.5px; opacity:.85; }
.upg-svg-chiplabel{ fill:var(--ink-2); }
.upg-svg-path-label{ fill:var(--blue); letter-spacing:2px; }
.upg-svg-idle-label{ opacity:.7; font-size:10px; }

.upg-svg-flow{ stroke:var(--cyan); stroke-width:2.4; fill:none; stroke-dasharray:10 90; opacity:.85; animation:upgFlow 4s linear infinite; }
@keyframes upgFlow{ to{ stroke-dashoffset:-100; } }
.upg-svg-flow.f1{ animation-duration:3.2s; }
.upg-svg-flow.f2{ animation-duration:4.6s; animation-delay:.5s; }
.upg-svg-flow.f3{ animation-duration:5.2s; animation-delay:1s; stroke:var(--ok); }
.upg-svg-flow.f4{ animation-duration:6.4s; animation-delay:1.6s; stroke:var(--ok); }

/* ---------- Sections ---------- */
.upg-sec{ margin-top:clamp(48px,7vw,72px); scroll-margin-top:calc(var(--header-h) + 20px); }
.upg-sec > h3{ font-size:clamp(1.05rem,.9rem + .6vw,1.25rem); font-weight:600; color:var(--ink); margin:30px 0 12px; scroll-margin-top:calc(var(--header-h) + 20px); letter-spacing:-.01em; }
.upg-sec-head{ display:flex; align-items:flex-start; gap:16px; margin-bottom:14px; }
.upg-sec-index{ font-size:1.05rem; color:var(--line-2); flex:none; padding-top:4px; }
.upg-sec-kicker{ font:500 .7rem var(--font-mono); text-transform:uppercase; letter-spacing:.16em; color:var(--blue); margin:0 0 4px; }
.upg-sec-head h2{ font-size:clamp(1.3rem, 1rem + 1.2vw, 1.7rem); font-weight:600; letter-spacing:-.01em; margin:0; line-height:1.25; }

.upg-sec p{ color:var(--ink-2); line-height:1.75; margin:0 0 16px; max-width:80ch; }
.upg-sec p strong{ color:var(--ink); }
.upg-sec a{ color:var(--blue); text-decoration:underline; text-underline-offset:2px; text-decoration-color:var(--blue-soft); transition:text-decoration-color .2s; }
.upg-sec a:hover{ text-decoration-color:var(--blue); }
.upg-sec ul, .upg-sec ol{ margin:0 0 16px; padding-left:22px; color:var(--ink-2); line-height:1.7; max-width:80ch; }
.upg-sec li{ margin-bottom:8px; }
.upg-sec li::marker{ color:var(--blue); }
.upg-sec code{ font:500 .84em var(--font-mono); background:var(--tint); border:1px solid var(--line); border-radius:5px; padding:1px 6px; color:var(--ink); white-space:nowrap; }

/* ---------- Ordered steps ---------- */
.upg-steps{ counter-reset:upg-step; list-style:none; padding:0; margin:0 0 20px; display:grid; gap:16px; }
.upg-steps > li{ counter-increment:upg-step; position:relative; padding:0 0 4px 46px; margin:0; min-height:38px; color:var(--ink-2); line-height:1.7; }
.upg-steps > li::before{ content:counter(upg-step, decimal-leading-zero); position:absolute; left:0; top:0; width:32px; height:32px; display:grid; place-items:center; font:600 .78rem var(--font-mono); color:var(--blue-deep); background:var(--tint); border:1px solid var(--blue-soft); border-radius:9px; }
.upg-steps > li strong{ color:var(--ink); }

/* ---------- Callouts & notes ---------- */
.upg-callout{ display:flex; gap:14px; align-items:flex-start; border-radius:var(--radius); padding:16px 18px; margin:24px 0; max-width:80ch; }
.upg-callout-ico{ flex:none; width:24px; height:24px; display:grid; place-items:center; border-radius:50%; font:700 .95rem/1 var(--font-display); }
.upg-callout-title{ margin:0 0 6px; font-weight:600; font-size:.98rem; color:var(--ink); }
.upg-callout-text{ margin:0; font-size:.92rem; line-height:1.6; }
.upg-callout-warn{ background:#fdf3e6; border:1px solid #f0d6a8; }
.upg-callout-warn .upg-callout-ico{ background:var(--warn); color:#3a2a00; }
.upg-callout-warn .upg-callout-text{ color:#6b5320; }
.upg-callout-danger{ background:#fcebe9; border:1px solid #f0b9b1; }
.upg-callout-danger .upg-callout-ico{ background:#e2574c; color:#fff; }
.upg-callout-danger .upg-callout-text{ color:#7a3328; }

/* ---------- Code blocks with copy button ---------- */
.upg-block{ background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:14px 16px; margin:20px 0; max-width:80ch; }
.upg-block-head{ display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:10px; flex-wrap:wrap; }
.upg-block-label{ font-size:.68rem; text-transform:uppercase; letter-spacing:.08em; color:var(--ink-3); }
.upg-code{ margin:0; background:var(--tint); border:1px solid var(--line); border-radius:8px; padding:14px 16px; overflow-x:auto; font:400 .8rem/1.7 var(--font-mono); color:var(--ink); white-space:pre; -webkit-overflow-scrolling:touch; }
.upg-code code{ background:none; border:0; padding:0; font:inherit; color:inherit; white-space:pre; }
.upg-copy{ font:500 .78rem var(--font-mono); color:var(--blue); background:none; border:1px solid var(--blue-soft); border-radius:7px; padding:6px 12px; cursor:pointer; transition:background .2s, color .2s, border-color .2s; flex:none; }
.upg-copy:hover{ background:var(--blue); color:#fff; border-color:var(--blue); }
.upg-copy:focus-visible{ outline:2px solid var(--blue); outline-offset:2px; }
.upg-copy.is-done{ background:var(--ok); border-color:var(--ok); color:#06281c; }
.upg-copy.is-error{ background:var(--warn); border-color:var(--warn); color:#3a2a00; }
.upg-block-note{ margin:10px 0 0; font-size:.8rem; color:var(--ink-3); line-height:1.6; }

/* ---------- Image placeholders (hidden until a valid image exists) ----------
   Future images: save under the tutorial's images/ folder and set the
   <img> data-src to that path. The figure is display:none by default;
   JS adds .is-ready only when the image actually loads, and removes
   it on load error — no empty boxes or broken-image icons ever show. */
.upg-figure{ display:none; margin:20px 0 8px; max-width:80ch; }
.upg-figure.is-ready{ display:block; }
.upg-figure img{ width:100%; height:auto; min-height:2px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); display:block; aspect-ratio:16/9; object-fit:cover; }
.upg-figure figcaption{ margin-top:10px; font:400 .78rem/1.6 var(--font-mono); color:var(--ink-3); }

/* ---------- Decision tree ---------- */
.upg-decision{ background:var(--surface); border:1px solid var(--line); border-left:3px solid var(--blue); border-radius:0 var(--radius) var(--radius) 0; padding:clamp(14px,2.5vw,22px) clamp(14px,3vw,26px); margin:24px 0; }
.upg-decision-title{ font-size:1rem; font-weight:600; color:var(--ink); margin:0 0 12px; letter-spacing:-.01em; }
.upg-decision-list{ list-style:none; padding:0; margin:0; display:grid; gap:14px; counter-reset:upg-dec; }
.upg-decision-list > li{ counter-increment:upg-dec; position:relative; padding-left:42px; color:var(--ink-2); line-height:1.7; }
.upg-decision-list > li::before{ content:counter(upg-dec, decimal-leading-zero); position:absolute; left:0; top:2px; width:30px; height:30px; display:grid; place-items:center; font:600 .75rem var(--font-mono); color:var(--blue-deep); background:var(--tint); border:1px solid var(--blue-soft); border-radius:8px; }
.upg-decision-list strong{ color:var(--ink); }

/* ---------- Interactive checklist (reuses shared .check-card / .check-item) ---------- */
.upg-check-progress{ display:flex; align-items:center; gap:14px; margin:8px 0 20px; flex-wrap:wrap; scroll-margin-top:calc(var(--header-h) + 20px); }
.upg-check-bar-track{ flex:1; min-width:160px; height:8px; background:var(--line); border-radius:999px; overflow:hidden; }
.upg-check-bar{ display:block; height:100%; width:0; background:linear-gradient(90deg, var(--blue), var(--cyan-bright)); border-radius:999px; transition:width .25s ease; }
.upg-check-count{ font-size:.75rem; color:var(--ink-3); white-space:nowrap; }
.upg-check-group-title{ font-size:1rem; font-weight:600; color:var(--ink); margin:4px 0 12px; letter-spacing:-.01em; }

/* ---------- References & related guides ---------- */
.upg-ref-list{ list-style:none; padding:0; margin:0 0 8px; display:grid; gap:10px; max-width:80ch; }
.upg-ref-list li{ color:var(--ink-2); line-height:1.65; font-size:.94rem; padding-left:18px; position:relative; }
.upg-ref-list li::before{ content:"→"; position:absolute; left:0; color:var(--blue); }
.upg-related-sec-note{ margin:0 0 14px; }
.upg-related{ display:grid; grid-template-columns:1fr; gap:14px; margin-top:8px; }
.upg-related-card{ display:flex; flex-direction:column; gap:6px; padding:18px; background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); text-decoration:none; color:var(--ink); transition:border-color .2s, transform .2s, box-shadow .2s; }
.upg-related-card:hover, .upg-related-card:focus-visible{ border-color:var(--blue); transform:translateY(-3px); box-shadow:var(--shadow-1); color:var(--ink); }
.upg-related-title{ font-size:1.02rem; font-weight:600; margin:0; line-height:1.35; }
.upg-related-sub{ font-size:.86rem; color:var(--ink-2); margin:0; line-height:1.6; }

/* ---------- Article footer ---------- */
.upg-foot{ margin-top:48px; padding-top:20px; border-top:1px solid var(--line); }
.upg-foot p{ font-size:.85rem; color:var(--ink-3); margin:0; line-height:1.6; max-width:80ch; }

/* ---------- Responsive ---------- */
@media (min-width:560px){
  .upg-related{ grid-template-columns:1fr 1fr; }
}
@media (min-width:1000px){
  .upg-grid{ grid-template-columns:300px minmax(0,1fr); gap:56px; }
  .upg-toc{ position:sticky; top:calc(var(--header-h) + 24px); align-self:start; max-height:calc(100vh - var(--header-h) - 48px); overflow:auto; }
}
@media (max-width:559px){
  .upg-steps > li{ padding-left:42px; }
  .upg-toc-item > a{ font-size:.82rem; }
  .upg-decision-list > li{ padding-left:38px; }
}

/* ---------- Dark theme (local hardcoded colors only) ---------- */
[data-theme="dark"] .upg-callout-warn{ background:#241a09; border-color:#5a4417; }
[data-theme="dark"] .upg-callout-warn .upg-callout-text{ color:#d8b878; }
[data-theme="dark"] .upg-callout-danger{ background:#26120f; border-color:#5c2a24; }
[data-theme="dark"] .upg-callout-danger .upg-callout-text{ color:#e8a79d; }
[data-theme="dark"] .upg-steps > li::before{ background:var(--tint); color:var(--blue); border-color:var(--blue-soft); }
[data-theme="dark"] .upg-decision-list > li::before{ background:var(--tint); color:var(--blue); border-color:var(--blue-soft); }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  .upg-progress{ display:none; }
  .upg-svg-flow{ animation:none !important; stroke-dasharray:none; opacity:.3; }
  .upg-svg-led{ animation:none !important; }
  .upg-check-bar{ transition:none; }
}

/* ---------- Print ---------- */
@media print{
  .upg-progress, .upg-toc, .to-top, .site-header, .topbar, .ad-wrap, .site-footer, .consent{ display:none !important; }
  .upg-grid{ display:block; padding:0; }
  .upg-article{ max-width:100%; }
  .upg-sec{ break-inside:avoid-page; margin-top:28px; }
  a{ color:var(--ink); text-decoration:none; }
}