/* ============================================================
   DiagMyPCHub — Performance tutorial
   Local stylesheet. Depends on the site design tokens from
   ../../css/style.css (loaded first in <head>). All tutorial
   styles are namespaced with the "perf-" prefix to avoid
   leaking into the rest of the site.
   ============================================================ */

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

/* ---------- Grid: TOC + article ---------- */
.perf-grid{ display:grid; grid-template-columns:1fr; gap:40px; padding-top:clamp(32px,5vw,56px); padding-bottom:clamp(56px,8vw,96px); }

.perf-toc{ display:none; }
.perf-toc-title{ font:500 .7rem var(--font-mono); text-transform:uppercase; letter-spacing:.14em; color:var(--ink-3); margin:0 0 12px; }
.perf-toc ul{ display:grid; gap:1px; border-left:1px solid var(--line); }
.perf-toc a{ display:block; padding:6px 14px; margin-left:-1px; border-left:2px solid transparent; color:var(--ink-2); text-decoration:none; font-size:.85rem; transition:color .2s, border-color .2s; }
.perf-toc a:hover{ color:var(--ink); }
.perf-toc a[aria-current="true"]{ color:var(--blue); border-left-color:var(--blue); font-weight:500; }

/* ---------- Article head ---------- */
.perf-article{ max-width:820px; }
.perf-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 20px; }
.perf-intro{ font-size:1.05rem; color:var(--ink-2); line-height:1.7; margin:0 0 16px; }

/* ---------- Warning / callouts ---------- */
.perf-warn{ display:flex; gap:14px; align-items:flex-start; background:#fdf3e6; border:1px solid #f0d6a8; border-radius:var(--radius); padding:16px 18px; margin:28px 0; }
.perf-warn-ico{ flex:none; width:24px; height:24px; display:grid; place-items:center; border-radius:50%; background:var(--warn); color:#3a2a00; font:700 .95rem/1 var(--font-display); }
.perf-warn-title{ margin:0 0 6px; font-weight:600; font-size:.98rem; }
.perf-warn-text{ margin:0; font-size:.92rem; color:#6b5320; }

.perf-callout{ border-left:3px solid var(--blue); background:var(--tint); border-radius:0 var(--radius) var(--radius) 0; padding:14px 18px; margin:24px 0; font-size:.95rem; color:var(--ink-2); }
.perf-callout p{ margin:0; }
.perf-callout strong{ color:var(--ink); }
.perf-callout.perf-tip{ border-left-color:var(--ok); background:#eafaf3; }
.perf-callout.perf-note{ border-left-color:var(--cyan); background:#eafaf7; }

/* ---------- Static image placeholder (hidden until an image exists) ---------- */
.perf-figure{ margin:0 0 8px; }
.perf-figure img{ width:100%; height:auto; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); display:block; }
.perf-figure figcaption{ margin-top:10px; font:400 .78rem var(--font-mono); color:var(--ink-3); }
.perf-figure[data-empty="true"]{ display:none; }

/* ---------- Sections ---------- */
.perf-sec{ margin-top:clamp(48px, 7vw, 72px); scroll-margin-top:calc(var(--header-h) + 16px); }
.perf-sec-head{ display:flex; align-items:flex-start; gap:16px; margin-bottom:18px; }
.perf-sec-index{ font:600 .95rem var(--font-mono); color:var(--line-2); flex:none; padding-top:4px; }
.perf-sec-kicker{ font:500 .7rem var(--font-mono); text-transform:uppercase; letter-spacing:.16em; color:var(--blue); margin:0 0 4px; }
.perf-sec-head h2{ font-size:clamp(1.3rem, 1rem + 1.2vw, 1.7rem); font-weight:600; letter-spacing:-.01em; margin:0; }
.perf-sec-lede{ color:var(--ink-2); font-size:1rem; line-height:1.7; margin:0 0 18px; max-width:70ch; }
.perf-article p{ color:var(--ink-2); line-height:1.75; margin:0 0 16px; }
.perf-article p strong, .perf-article p em{ color:var(--ink); }
.perf-article a{ color:var(--blue); text-decoration:underline; text-underline-offset:2px; text-decoration-color:var(--blue-soft); transition:text-decoration-color .2s; }
.perf-article a:hover{ text-decoration-color:var(--blue); }
.perf-article h3{ font-size:1.15rem; font-weight:600; margin:28px 0 12px; }
.perf-article ul, .perf-article ol{ margin:0 0 16px; padding-left:22px; color:var(--ink-2); line-height:1.7; }
.perf-article li{ margin-bottom:8px; }
.perf-article li::marker{ color:var(--blue); }

/* ---------- Ordered steps ---------- */
.perf-steps{ counter-reset:perf-step; list-style:none; padding:0; margin:0 0 20px; display:grid; gap:12px; }
.perf-steps > li{ counter-increment:perf-step; position:relative; padding:0 0 0 46px; margin:0; min-height:40px; }
.perf-steps > li::before{ content:counter(perf-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; }
.perf-steps > li strong{ color:var(--ink); }

/* ---------- "Do not" list ---------- */
.perf-dont{ list-style:none; padding:0; margin:0 0 20px; display:grid; gap:10px; }
.perf-dont li{ position:relative; padding:2px 0 2px 34px; margin:0; }
.perf-dont li::before{ content:"\2715"; position:absolute; left:0; top:0; color:#d9534f; font-weight:700; }
.perf-dont li strong{ color:var(--ink); }

/* ---------- Method stage stepper ---------- */
.perf-stages{ margin:24px 0; }
.perf-stage-opts{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:14px; }
.perf-stage-btn{ font:500 .82rem var(--font-mono); color:var(--ink-2); background:var(--surface); border:1px solid var(--line-2); border-radius:999px; padding:9px 16px; cursor:pointer; transition:border-color .2s, color .2s, background .2s; }
.perf-stage-btn:hover{ border-color:var(--blue); color:var(--blue); }
.perf-stage-btn.is-active{ background:var(--blue); border-color:var(--blue); color:#fff; }
.perf-stage-hint{ font-size:.85rem; color:var(--ink-3); margin:0 0 6px; min-height:1.4em; }
.perf-stage-result{ border:1px solid var(--line); border-left:3px solid var(--blue); border-radius:var(--radius); background:var(--surface); padding:18px 20px; margin-bottom:12px; }
.perf-stage-path p{ margin:0; font-size:.95rem; color:var(--ink-2); line-height:1.7; }
.perf-stage-path strong{ color:var(--ink); }
.perf-noscript{ font-size:.9rem; color:var(--ink-2); border-left:3px solid var(--line-2); padding-left:14px; }

/* ---------- Diagnostic "check first" ---------- */
.perf-diag{ margin:24px 0; }
.perf-diag-opts{ display:grid; grid-template-columns:1fr; gap:10px; margin-bottom:16px; }
.perf-diag-btn{ text-align:left; font:500 .95rem var(--font-body); color:var(--ink); background:var(--surface); border:1px solid var(--line-2); border-radius:var(--radius); padding:14px 16px; cursor:pointer; transition:border-color .2s, background .2s, transform .15s; }
.perf-diag-btn:hover{ border-color:var(--blue); background:var(--tint); transform:translateY(-1px); }
.perf-diag-btn.is-active{ border-color:var(--blue); background:var(--tint); box-shadow:inset 3px 0 0 var(--blue); }
.perf-diag-hint{ font-size:.85rem; color:var(--ink-3); margin:0 0 6px; min-height:1.4em; }
.perf-diag-result{ border:1px solid var(--line); border-left:3px solid var(--cyan); border-radius:var(--radius); background:var(--surface); padding:18px 20px; margin-bottom:12px; }
.perf-diag-path p{ margin:0 0 12px; font-size:.95rem; color:var(--ink-2); line-height:1.7; }
.perf-diag-path p:last-child{ margin-bottom:0; }
.perf-diag-path strong{ color:var(--ink); }

/* ---------- Verdict ---------- */
.perf-verdict{ margin:40px 0; padding:22px; background:var(--dark-2); color:var(--dark-ink); border:1px solid var(--dark-line); border-radius:14px; }
.perf-verdict-label{ margin:0 0 14px; font:600 1.05rem var(--font-display); }
.perf-verdict-btns{ display:flex; flex-wrap:wrap; gap:10px; margin-bottom:14px; }
.perf-vbtn{ font:500 .88rem var(--font-body); color:var(--dark-ink); background:transparent; border:1px solid var(--dark-line); border-radius:10px; padding:10px 16px; cursor:pointer; transition:border-color .2s, background .2s, color .2s; }
.perf-vbtn:hover{ border-color:var(--cyan-bright); color:#fff; }
.perf-vbtn.is-active{ background:var(--cyan); border-color:var(--cyan); color:#04222a; }
.perf-verdict-msg{ margin:0; font-size:.9rem; color:var(--dark-muted); min-height:1.4em; }

/* ---------- Animated SVG diagram ---------- */
.perf-diagram{ margin:32px 0; background:var(--dark-2); border:1px solid var(--dark-line); border-radius:14px; padding:clamp(8px, 2vw, 18px); }
.perf-diagram svg{ width:100%; height:auto; display:block; }

.perf-glow{ animation:perfGlow 7s ease-in-out infinite alternate; transform-box:fill-box; transform-origin:center; }
@keyframes perfGlow{ from{ opacity:.6; } to{ opacity:1; transform:scale(1.04); } }

.perf-board{ fill:#0b1a30; stroke:#24466f; stroke-width:2; }
.perf-die{ fill:#0e2038; stroke:#2e5f93; stroke-width:1.5; }
.perf-core{ fill:#41e2f5; animation:perfCore 2.4s ease-in-out infinite; transform-box:fill-box; transform-origin:center; }
@keyframes perfCore{ 50%{ transform:scale(1.25); opacity:.72; } }
.perf-ring{ fill:none; stroke:#41e2f5; stroke-width:1.5; opacity:0; transform-box:fill-box; transform-origin:center; animation:perfRing 3s ease-out infinite; }
@keyframes perfRing{ 0%{ transform:scale(.6); opacity:.7; } 70%{ transform:scale(1.9); opacity:0; } 100%{ opacity:0; } }

.perf-stream{ stroke:#24466f; stroke-width:2; stroke-dasharray:6 10; animation:perfStream 1.8s linear infinite; }
@keyframes perfStream{ to{ stroke-dashoffset:-32; } }

.perf-track{ fill:#12314f; stroke:#24466f; stroke-width:1; }
.perf-fill{ transform-box:fill-box; transform-origin:bottom; }
.perf-fill-cpu{ fill:#3f7fbf; animation:perfCpu 4s ease-in-out infinite; }
@keyframes perfCpu{ 0%,100%{ transform:scaleY(.35); } 50%{ transform:scaleY(.8); } }
.perf-fill-mem{ fill:#14c3d9; animation:perfMem 5.5s ease-in-out infinite; }
@keyframes perfMem{ 0%,100%{ transform:scaleY(.55); } 50%{ transform:scaleY(.9); } }
.perf-fill-disk{ fill:#8aa3c4; animation:perfDisk 3s ease-in-out infinite; }
@keyframes perfDisk{ 0%,100%{ transform:scaleY(.2); } 40%{ transform:scaleY(.62); } 60%{ transform:scaleY(.42); } }

.perf-threshold{ stroke:#e0563a; stroke-width:1; stroke-dasharray:4 4; opacity:.6; }
.perf-heat-track{ fill:#12314f; }
.perf-heat{ fill:url(#perfHeat); transform-box:fill-box; transform-origin:left; animation:perfHeat 4s ease-in-out infinite; }
@keyframes perfHeat{ 0%,100%{ transform:scaleX(.5); opacity:.8; } 50%{ transform:scaleX(.85); opacity:1; } }

.perf-boot{ transform-box:fill-box; transform-origin:left; animation:perfBoot 6s ease-in-out infinite; }
@keyframes perfBoot{ 0%{ transform:scaleX(0); } 70%,100%{ transform:scaleX(1); } }
.perf-phase{ stroke:#24466f; stroke-width:1; }
.perf-label{ fill:#8aa3c4; font:600 13px var(--font-mono); letter-spacing:2px; }
.perf-label-sm{ fill:#5b7396; font:500 10px var(--font-mono); letter-spacing:1.5px; }
.perf-phase-label{ fill:#5b7396; font:500 10px var(--font-mono); letter-spacing:1px; }
.perf-status{ fill:#5b7396; font:500 12px var(--font-mono); letter-spacing:1px; }

/* ---------- Copyable commands ---------- */
.perf-cmd{ display:grid; grid-template-columns:auto 1fr auto; align-items:center; gap:12px; background:var(--surface); border:1px solid var(--line); border-radius:10px; padding:12px 14px; margin:10px 0; }
.perf-cmd-label{ font:500 .68rem var(--font-mono); text-transform:uppercase; letter-spacing:.08em; color:var(--ink-3); min-width:88px; }
.perf-cmd code{ font:500 .85rem var(--font-mono); color:var(--ink); background:var(--tint); border-radius:6px; padding:6px 10px; overflow-x:auto; white-space:nowrap; }
.perf-cmd-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; flex:none; }
.perf-cmd-copy:hover{ background:var(--blue); color:#fff; border-color:var(--blue); }
.perf-cmd-note{ grid-column:1 / -1; margin:2px 0 0; font-size:.8rem; color:var(--ink-3); }

/* ---------- Ordered fixes with "mark done" ---------- */
.perf-fixes{ margin:24px 0; }
.perf-fix-progress{ height:6px; background:var(--line); border-radius:999px; overflow:hidden; margin-bottom:10px; }
.perf-fix-progress span{ display:block; height:100%; width:0; background:linear-gradient(90deg, var(--blue), var(--cyan-bright)); transition:width .3s ease; }
.perf-fix-count{ font:500 .78rem var(--font-mono); color:var(--ink-3); margin:0 0 18px; }
.perf-fix{ display:flex; gap:14px; padding:16px; margin-bottom:12px; background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); transition:border-color .2s; }
.perf-fix.is-done{ border-color:var(--ok); }
.perf-fix-check{ display:flex; flex-direction:column; align-items:center; gap:6px; flex:none; cursor:pointer; }
.perf-fix-box{ width:22px; height:22px; accent-color:var(--blue); cursor:pointer; }
.perf-fix.is-done .perf-fix-box{ accent-color:var(--ok); }
.perf-fix-check > span{ font:500 .68rem var(--font-mono); color:var(--ink-3); }
.perf-fix-main{ flex:1; min-width:0; }
.perf-fix-title{ font-size:1.02rem; font-weight:600; margin:0 0 6px; }
.perf-fix.is-done .perf-fix-title{ color:var(--ink-2); }
.perf-fix-risk{ display:inline-block; font:500 .64rem var(--font-mono); text-transform:uppercase; letter-spacing:.06em; border-radius:999px; padding:3px 9px; margin-bottom:8px; }
.perf-risk-safe{ color:#1f7a58; background:#eafaf3; border:1px solid #bfe9d6; }
.perf-risk-moderate{ color:#8a5a12; background:#fdf3e6; border:1px solid #f0d6a8; }
.perf-fix-body{ font-size:.92rem; color:var(--ink-2); margin:0 0 8px; }
.perf-fix-verify{ font-size:.86rem; color:var(--ink-3); margin:0; }
.perf-fix-verify strong{ color:var(--ink-2); }

/* ---------- Checklist ---------- */
.perf-check{ background:var(--surface); color:var(--ink); border:1px solid var(--line); border-radius:14px; padding:20px; }
.perf-check-file{ display:flex; justify-content:space-between; font-size:.72rem; color:var(--ink-3); border-bottom:1px dashed var(--line-2); padding-bottom:12px; margin:0 0 12px; }
.perf-check-list{ list-style:none; padding:0; margin:0; }
.perf-check-list li{ margin:0; }
.perf-check-list label{ display:flex; align-items:flex-start; gap:12px; padding:10px 8px; border-radius:8px; cursor:pointer; transition:background .15s; font-size:.93rem; color:var(--ink-2); }
.perf-check-list label:hover{ background:#f2f7ff; }
.perf-check-box{ width:18px; height:18px; margin:2px 0 0; accent-color:var(--blue); flex:none; cursor:pointer; }
.perf-check-box:checked + span{ color:var(--ink); }
.perf-check-actions{ display:flex; align-items:center; flex-wrap:wrap; gap:12px; margin-top:16px; padding-top:16px; border-top:1px solid var(--line); }
.perf-check-hint{ font-size:.7rem; color:var(--ink-3); margin:0; }

/* ---------- FAQ (native <details>) ---------- */
.perf-faq{ display:grid; gap:10px; }
.perf-faq-item{ background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); transition:border-color .2s; }
.perf-faq-item[open]{ border-color:var(--blue-soft); }
.perf-faq-sum{ list-style:none; cursor:pointer; display:flex; align-items:center; gap:12px; padding:16px 18px; font-weight:600; font-size:.98rem; color:var(--ink); }
.perf-faq-sum::-webkit-details-marker{ display:none; }
.perf-faq-ico{ margin-left:auto; position:relative; width:16px; height:16px; flex:none; }
.perf-faq-ico::before, .perf-faq-ico::after{ content:""; position:absolute; left:0; top:7px; width:16px; height:2px; background:var(--ink-3); transition:transform .25s, background .25s; }
.perf-faq-ico::after{ transform:rotate(90deg); }
.perf-faq-item[open] .perf-faq-ico::after{ transform:rotate(0deg); }
.perf-faq-item[open] .perf-faq-ico::before, .perf-faq-item[open] .perf-faq-ico::after{ background:var(--blue); }
.perf-faq-panel{ display:grid; grid-template-rows:0fr; transition:grid-template-rows .35s ease; }
.perf-faq-item[open] .perf-faq-panel{ grid-template-rows:1fr; }
.perf-faq-inner{ overflow:hidden; min-height:0; visibility:hidden; transition:visibility 0s .35s; }
.perf-faq-item[open] .perf-faq-inner{ visibility:visible; transition-delay:0s; }
.perf-faq-inner p{ margin:0; padding:0 18px 18px; color:var(--ink-2); font-size:.95rem; line-height:1.7; }

/* ---------- Related guides ---------- */
.perf-related{ display:grid; grid-template-columns:1fr; gap:14px; margin-top:8px; }
.perf-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; }
.perf-related-card:hover, .perf-related-card:focus-visible{ border-color:var(--blue); transform:translateY(-3px); box-shadow:var(--shadow-1); }
.perf-related-title{ font-size:1.02rem; font-weight:600; margin:0; }
.perf-related-sub{ font-size:.86rem; color:var(--ink-2); margin:0; }

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

/* ---------- Ad slot (self-contained; hides when empty) ---------- */
.ad-wrap{ margin:clamp(40px, 6vw, 64px) 0; }
.ad-slot{ display:none; }
.ad-slot:not(:empty){ display:flex; align-items:center; justify-content:center; position:relative; max-width:720px; min-height:250px; margin-inline:auto; border:1px dashed var(--line-2); background:var(--surface); border-radius:var(--radius); overflow:hidden; }
.ad-slot:not(:empty)::before{ content:"Advertisement"; position:absolute; top:8px; right:12px; font:500 .62rem var(--font-mono); text-transform:uppercase; letter-spacing:.1em; color:var(--ink-3); }
.ad-slot:not(:empty) *{ max-width:100%; }

/* ---------- Local footer ---------- */
.perf-localfoot{ margin-top:56px; padding-top:20px; border-top:1px solid var(--line); font-size:.85rem; color:var(--ink-3); }

/* ---------- Responsive ---------- */
@media (min-width:560px){
  .perf-diag-opts{ grid-template-columns:1fr 1fr; }
  .perf-related{ grid-template-columns:1fr 1fr; }
}
@media (min-width:1000px){
  .perf-grid{ grid-template-columns:230px minmax(0,1fr); gap:56px; }
  .perf-toc{ display:block; position:sticky; top:calc(var(--header-h) + 24px); align-self:start; max-height:calc(100vh - var(--header-h) - 48px); overflow:auto; }
  .perf-related{ grid-template-columns:1fr 1fr; }
}
@media (max-width:559px){
  .perf-cmd{ grid-template-columns:1fr; }
  .perf-cmd-label{ min-width:0; }
  .perf-fix{ flex-direction:column; }
  .perf-fix-check{ flex-direction:row; align-items:center; }
  .perf-diag-opts{ grid-template-columns:1fr; }
}

/* ---------- Dark theme (loaded after this file) ---------- */
[data-theme="dark"] .perf-warn{ background:#241a09; border-color:#5a4417; }
[data-theme="dark"] .perf-warn-text{ color:#d8b878; }
[data-theme="dark"] .perf-callout.perf-tip{ background:#0d2419; }
[data-theme="dark"] .perf-callout.perf-note{ background:#0a2226; }
[data-theme="dark"] .perf-steps > li::before{ background:var(--tint); color:var(--blue); border-color:var(--blue-soft); }
[data-theme="dark"] .perf-cmd code{ background:var(--tint); }
[data-theme="dark"] .perf-risk-safe{ color:#5ad0a6; background:#0d2419; border-color:#1c4a35; }
[data-theme="dark"] .perf-risk-moderate{ color:#f0b45f; background:#241a09; border-color:#5a4417; }
[data-theme="dark"] .perf-check-list label:hover{ background:var(--tint); }
[data-theme="dark"] .perf-figure figcaption{ color:var(--ink-3); }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  .perf-progress{ display:none; }
  .perf-glow, .perf-core, .perf-ring, .perf-stream, .perf-fill, .perf-heat, .perf-boot{ animation:none !important; }
  .perf-fill-cpu{ transform:scaleY(.4); }
  .perf-fill-mem{ transform:scaleY(.6); }
  .perf-fill-disk{ transform:scaleY(.3); }
  .perf-boot{ transform:scaleX(1); }
  .perf-heat{ transform:scaleX(.6); }
  .perf-faq-panel, .perf-faq-inner{ transition:none; }
}

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