/* ============================================================
   DiagMyPCHub — iSCSI & Network-Attached Storage tutorial
   Local stylesheet. Depends on the site design tokens from
   ../../css/style.css (loaded first in <head>). All page
   styles are namespaced with the "iscsi-" prefix.
   ============================================================ */

/* ---------- Reading progress ---------- */
.iscsi-progress{ position:fixed; top:0; left:0; right:0; height:3px; z-index:120; background:transparent; pointer-events:none; }
.iscsi-progress span{ display:block; height:100%; width:0; background:linear-gradient(90deg, var(--blue), var(--cyan-bright)); transition:width 0.1s linear; }

/* ---------- Grid: TOC + article ---------- */
.iscsi-grid{ display:grid; grid-template-columns:1fr; gap:40px; padding-top:clamp(32px,5vw,56px); padding-bottom:clamp(56px,8vw,96px); }
.iscsi-toc{ display:none; }
@media (min-width:1100px){
  .iscsi-grid{ grid-template-columns:240px minmax(0,1fr); gap:56px; }
  .iscsi-toc{
    display:block;
    position:sticky;
    top:calc(var(--header-h) + 20px);
    align-self:start;
    max-height:calc(100vh - var(--header-h) - 40px);
    overflow-y:auto;
    padding-right:6px;
  }
}
.iscsi-toc-title{ font:500 .7rem var(--font-mono); text-transform:uppercase; letter-spacing:.14em; color:var(--ink-3); margin:0 0 12px; }
.iscsi-toc ul{ display:grid; gap:1px; border-left:1px solid var(--line); }
.iscsi-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; line-height:1.4; transition:color .2s, border-color .2s, background .2s; }
.iscsi-toc a:hover{ color:var(--ink); background:var(--tint); }
.iscsi-toc a[aria-current="true"]{ color:var(--blue); border-left-color:var(--blue); font-weight:500; background:var(--tint); }

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

/* ---------- Sections ---------- */
.iscsi-sec{ margin-top:clamp(48px, 7vw, 72px); scroll-margin-top:calc(var(--header-h) + 16px); }
.iscsi-sec-head{ display:flex; align-items:flex-start; gap:16px; margin-bottom:18px; }
.iscsi-sec-index{ font:600 .95rem var(--font-mono); color:var(--line-2); flex:none; padding-top:4px; }
.iscsi-sec-kicker{ font:500 .7rem var(--font-mono); text-transform:uppercase; letter-spacing:.16em; color:var(--blue); margin:0 0 4px; }
.iscsi-sec-head h2{ font-size:clamp(1.3rem, 1rem + 1.2vw, 1.7rem); font-weight:600; letter-spacing:-.01em; margin:0; }
.iscsi-sec-lede{ color:var(--ink-2); font-size:1rem; line-height:1.7; margin:0 0 18px; max-width:70ch; }

/* ---------- Article body text ---------- */
.iscsi-article p{ color:var(--ink-2); line-height:1.75; margin:0 0 16px; }
.iscsi-article p strong, .iscsi-article p em{ color:var(--ink); }
.iscsi-article a{ color:var(--blue); text-decoration:underline; text-underline-offset:2px; text-decoration-color:var(--blue-soft); transition:text-decoration-color .2s; }
.iscsi-article a:hover{ text-decoration-color:var(--blue); }
.iscsi-article ul, .iscsi-article ol{ margin:0 0 16px; padding-left:22px; color:var(--ink-2); line-height:1.7; }
.iscsi-article li{ margin-bottom:8px; }
.iscsi-article li::marker{ color:var(--blue); }
.iscsi-article code{ font:500 .84rem var(--font-mono); background:var(--tint); border-radius:4px; padding:2px 6px; color:var(--ink); }

/* ---------- Warning / callouts ---------- */
.iscsi-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; }
.iscsi-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); }
.iscsi-warn-title{ margin:0 0 6px; font-weight:600; font-size:.98rem; color:#6b5320; }
.iscsi-warn-text{ margin:0; font-size:.92rem; color:#6b5320; line-height:1.6; }

/* ---------- Ordered steps ---------- */
.iscsi-steps{ counter-reset:iscsi-step; list-style:none; padding:0; margin:0 0 20px; display:grid; gap:12px; }
.iscsi-steps > li{ counter-increment:iscsi-step; position:relative; padding:0 0 0 46px; margin:0; min-height:40px; line-height:1.7; color:var(--ink-2); }
.iscsi-steps > li::before{ content:counter(iscsi-step, decimal-leading-zero); position:absolute; left:0; top:2px; 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; }
.iscsi-steps > li strong{ color:var(--ink); }

/* ---------- Code blocks with copy ---------- */
.iscsi-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:14px 0; }
.iscsi-cmd-label{ font:500 .68rem var(--font-mono); text-transform:uppercase; letter-spacing:.08em; color:var(--ink-3); min-width:90px; flex:none; }
.iscsi-cmd code{ font:500 .84rem/1.6 var(--font-mono); color:var(--ink); background:var(--tint); border-radius:6px; padding:8px 12px; overflow-x:auto; white-space:pre-wrap; word-break:break-all; }
.iscsi-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, border-color .2s; flex:none; white-space:nowrap; }
.iscsi-cmd-copy:hover{ background:var(--blue); color:#fff; border-color:var(--blue); }
.iscsi-cmd-copy.is-done{ background:var(--ok); border-color:var(--ok); color:#06281c; }
.iscsi-cmd-note{ grid-column:1 / -1; margin:4px 0 0; font-size:.8rem; color:var(--ink-3); line-height:1.5; }

/* ---------- Tables ---------- */
.iscsi-table-wrap{ overflow-x:auto; margin:20px 0; border:1px solid var(--line); border-radius:var(--radius); }
.iscsi-table{ width:100%; border-collapse:collapse; font-size:.88rem; min-width:600px; }
.iscsi-table thead th{ font:600 .78rem var(--font-mono); text-transform:uppercase; letter-spacing:.06em; color:var(--ink-3); background:var(--bg); padding:12px 14px; text-align:left; border-bottom:2px solid var(--line); }
.iscsi-table tbody td{ padding:11px 14px; border-bottom:1px solid var(--line); color:var(--ink-2); vertical-align:top; line-height:1.5; }
.iscsi-table tbody tr:last-child td{ border-bottom:0; }
.iscsi-table tbody tr:hover{ background:var(--tint); }
.iscsi-table caption{ padding:0; margin:0; }

/* ---------- SVG diagram ---------- */
.iscsi-diagram{ margin:28px 0; background:var(--dark-2); border:1px solid var(--dark-line); border-radius:14px; padding:clamp(12px,3vw,24px); }
.iscsi-diagram svg{ width:100%; height:auto; display:block; color:#5b7396; }
.iscsi-svg-box{ fill:#0e2038; stroke:#2e5f93; stroke-width:1.5; rx:10; }
.iscsi-svg-storage{ stroke:var(--cyan-bright); stroke-width:2; }
.iscsi-svg-label{ fill:var(--dark-ink); font:600 12px var(--font-mono); letter-spacing:1.5px; }
.iscsi-svg-sub{ fill:var(--dark-muted); font:400 10px var(--font-mono); letter-spacing:.3px; }
.iscsi-svg-accent{ fill:var(--cyan-bright); font:600 11px var(--font-mono); letter-spacing:.5px; }
.iscsi-svg-status{ fill:#7fb3e8; font:400 10.5px var(--font-mono); letter-spacing:.3px; }
.iscsi-svg-trace{ stroke:#24466f; stroke-width:2; fill:none; }
.iscsi-svg-flow{ stroke:var(--cyan-bright); stroke-width:2.4; stroke-dasharray:12 60; animation:iscsi-flow 2.2s linear infinite; }
.iscsi-svg-flow-b{ stroke:var(--blue, #0f5bd7); stroke-width:2.4; stroke-dasharray:12 50; animation:iscsi-flow-b 2.6s linear infinite 0.4s; }
.iscsi-svg-legend-bg{ fill:#0a1830; stroke:#1d3a5f; stroke-width:1; rx:8; }
@keyframes iscsi-flow{ to{ stroke-dashoffset:-72; } }
@keyframes iscsi-flow-b{ to{ stroke-dashoffset:-62; } }
@media (prefers-reduced-motion:reduce){
  .iscsi-svg-flow, .iscsi-svg-flow-b{ animation:none; stroke-dasharray:none; opacity:.7; }
}

/* ---------- Image placeholders (hidden until populated) ---------- */
.iscsi-figure{ margin:20px 0 8px; }
.iscsi-figure[data-empty="true"]{ display:none; }
.iscsi-figure img{ width:100%; height:auto; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); display:block; }
.iscsi-figure figcaption{ margin-top:8px; font:400 .76rem/1.5 var(--font-mono); color:var(--ink-3); }

/* ---------- Ad placeholder (hidden until populated) ---------- */
.iscsi-ad-wrap{ margin:40px auto 0; max-width:var(--wrap); padding-inline:20px; }
.iscsi-ad-wrap[data-populated="false"]{ display:none; }
.iscsi-ad-slot{ min-height:100px; background:var(--surface); border:1px dashed var(--line-2); border-radius:var(--radius); display:grid; place-items:center; color:var(--ink-3); font:500 .78rem var(--font-mono); }

/* ---------- Checklist ---------- */
.iscsi-check{ background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:20px; margin:24px 0; box-shadow:var(--shadow-1); }
.iscsi-check-file{ display:flex; justify-content:space-between; font-size:.72rem; color:var(--ink-3); border-bottom:1px dashed var(--line-2); padding-bottom:10px; margin:0 0 14px; font-family:var(--font-mono); }
.iscsi-check-list{ list-style:none; margin:0; padding:0; display:grid; gap:4px; }
.iscsi-check-list li label{ display:flex; gap:12px; align-items:flex-start; padding:9px 8px; border-radius:8px; cursor:pointer; font-size:.92rem; color:var(--ink-2); transition:background .15s; line-height:1.5; }
.iscsi-check-list li label:hover{ background:#f6f9fd; }
.iscsi-check-list input{ width:17px; height:17px; margin-top:2px; accent-color:var(--blue); flex:none; }
.iscsi-check-list input:checked + span{ color:var(--ink); }
.iscsi-check-actions{ display:flex; align-items:center; gap:12px; flex-wrap:wrap; margin-top:14px; padding-top:14px; border-top:1px solid var(--line); }
.iscsi-check-hint{ font-size:.68rem; color:var(--ink-3); margin:0; }

/* ---------- Glossary ---------- */
.iscsi-glossary{ margin:20px 0; }
.iscsi-glossary dt{ font:600 .95rem var(--font-display); color:var(--ink); margin-top:16px; }
.iscsi-glossary dt:first-child{ margin-top:0; }
.iscsi-glossary dd{ margin:4px 0 0 0; font-size:.92rem; color:var(--ink-2); line-height:1.6; padding-left:14px; border-left:2px solid var(--line); }

/* ---------- End note ---------- */
.iscsi-end-note{ margin-top:32px; padding:16px 20px; background:var(--tint); border-radius:var(--radius); font-size:.92rem; color:var(--ink-2); border-left:3px solid var(--cyan); }

/* ---------- Toast ---------- */
.iscsi-toast, #iscsi-toast{ position:fixed; bottom:24px; left:50%; transform:translateX(-50%) translateY(80px); background:var(--ink); color:var(--bg); padding:10px 20px; border-radius:8px; font-size:.86rem; opacity:0; transition:opacity .3s, transform .3s; z-index:200; pointer-events:none; }
#iscsi-toast.is-visible{ opacity:1; transform:translateX(-50%) translateY(0); }

/* ---------- Back to top ---------- */
#iscsi-backtop{ position:fixed; bottom:24px; right:24px; width:42px; height:42px; display:grid; place-items:center; background:var(--surface); border:1px solid var(--line-2); border-radius:10px; color:var(--ink-2); cursor:pointer; opacity:0; transform:translateY(10px); transition:opacity .3s, transform .3s, border-color .2s, color .2s; z-index:90; }
#iscsi-backtop.is-visible{ opacity:1; transform:none; }
#iscsi-backtop:hover{ border-color:var(--blue); color:var(--blue); }

/* ---------- Dark theme overrides ---------- */
[data-theme="dark"] .iscsi-warn{ background:#2a2010; border-color:#5c4a20; }
[data-theme="dark"] .iscsi-warn-title, [data-theme="dark"] .iscsi-warn-text{ color:#e8d5a0; }
[data-theme="dark"] .iscsi-cmd{ background:var(--dark-2); border-color:var(--dark-line); }
[data-theme="dark"] .iscsi-cmd code{ background:rgba(255,255,255,.04); color:var(--dark-ink); }
[data-theme="dark"] .iscsi-table thead th{ background:var(--dark-2); color:var(--dark-muted); border-bottom-color:var(--dark-line); }
[data-theme="dark"] .iscsi-table tbody td{ color:var(--dark-ink); border-bottom-color:var(--dark-line); }
[data-theme="dark"] .iscsi-table tbody tr:hover{ background:rgba(255,255,255,.03); }
[data-theme="dark"] .iscsi-check{ background:var(--dark-2); border-color:var(--dark-line); }
[data-theme="dark"] .iscsi-check-list li label:hover{ background:rgba(255,255,255,.04); }
[data-theme="dark"] .iscsi-end-note{ background:var(--dark-2); color:var(--dark-muted); border-left-color:var(--cyan); }
[data-theme="dark"] .iscsi-ad-slot{ background:var(--dark-2); border-color:var(--dark-line); color:var(--dark-muted); }
[data-theme="dark"] #iscsi-backtop{ background:var(--dark-2); border-color:var(--dark-line); color:var(--dark-muted); }

/* ---------- Print ---------- */
@media print{
  .iscsi-progress, .iscsi-toc, .iscsi-cmd-copy, .iscsi-check-actions, #iscsi-backtop, .site-header, .topbar, .nav-toggle, .theme-toggle, .nav-cta{ display:none !important; }
  .iscsi-grid{ grid-template-columns:1fr; gap:0; padding:0; }
  .iscsi-article{ max-width:100%; }
  .iscsi-sec{ margin-top:32px; page-break-inside:avoid; }
  .iscsi-diagram{ background:#fff; border-color:#ccc; }
  .iscsi-svg-box{ fill:#f4f7fb; stroke:#999; }
  .iscsi-svg-label{ fill:#0d1b2e; }
  .iscsi-svg-sub{ fill:#44546b; }
  body{ background:#fff; color:#000; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  .iscsi-progress span{ transition:none; }
  .iscsi-toc a{ transition:none; }
  .iscsi-cmd-copy{ transition:none; }
  #iscsi-backtop{ transition:none; }
}