/* Attribution Debugger: blueprint identity. Drafting-grid paper, navy ink, flowchart nodes. */
:root {
  --paper: #f3f7fc;
  --grid: #dde8f5;
  --card: #ffffff;
  --ink: #0b2545;
  --ink-2: #2c4366;
  --muted: #64779a;
  --line: #c9d7ea;
  --blue: #1e4fbf;
  --blue-2: #2f66e0;
  --blue-tint: #e6eefc;
  --flag: #c2410c;
  --flag-tint: #fdeee4;
  --ok: #0f766e;
  --ok-tint: #e2f5f2;
  --max: 1200px;
  --sans: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --mono: "Space Mono", ui-monospace, Menlo, monospace;
  color-scheme: light;
}
* { box-sizing: border-box; }
body {
  margin: 0; color: var(--ink); font: 16.5px/1.6 var(--sans); -webkit-font-smoothing: antialiased;
  background-color: var(--paper);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
}
a { color: var(--blue); text-underline-offset: 3px; }
p { margin: 0; }
code { font: .88em var(--mono); background: var(--blue-tint); padding: 1px 5px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } }
h1, h2, h3, h4 { margin: 0; letter-spacing: -0.02em; line-height: 1.12; }
h1 { font-size: clamp(34px, 5vw, 58px); font-weight: 700; }
h2 { font-size: clamp(25px, 3vw, 34px); font-weight: 700; }
h3 { font-size: 21px; font-weight: 700; }
.mono, .label { font-family: var(--mono); }
.label { font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--blue); }

/* nav: title block like a drawing sheet */
.nav { background: var(--card); border-bottom: 2px solid var(--ink); position: sticky; top: 0; z-index: 20; }
.nav .wrap { display: flex; align-items: stretch; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; padding-right: 20px; border-right: 1px solid var(--line); }
.brand .mk { width: 26px; height: 26px; border: 2px solid var(--ink); display: grid; place-items: center; }
.nav-links { display: flex; margin-left: auto; }
.nav-links a { display: flex; align-items: center; padding: 0 16px; border-left: 1px solid var(--line); color: var(--ink-2); text-decoration: none; font-size: 14.5px; font-weight: 500; }
.nav-links a:hover, .nav-links a.on { background: var(--blue-tint); color: var(--blue); }
@media (max-width: 900px) { .nav-links { display: none; } }

/* hero */
.hero { padding: 64px 0 44px; }
.hero .grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 900px) { .hero .grid { grid-template-columns: 1fr; } }
.hero .lead { font-size: 19px; color: var(--ink-2); margin: 18px 0 26px; max-width: 600px; }
.sheet { background: var(--card); border: 2px solid var(--ink); position: relative; }
.sheet::before { content: attr(data-title); position: absolute; top: -12px; left: 16px; background: var(--card); padding: 0 8px; font: 700 11.5px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink); }
.flowmini { padding: 26px 20px 18px; display: grid; gap: 10px; font: 13px var(--mono); }
.flowmini .nd { border: 1.5px solid var(--ink); padding: 8px 12px; background: var(--card); }
.flowmini .nd.q { border-color: var(--blue); color: var(--blue); }
.flowmini .nd.x { border-color: var(--flag); color: var(--flag); border-style: dashed; }
.flowmini .ar { text-align: center; color: var(--muted); line-height: 1; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 18px; border: 2px solid var(--ink); background: var(--ink); color: #fff; font: 700 15px var(--sans); text-decoration: none; cursor: pointer; }
.btn:hover { background: var(--blue); border-color: var(--blue); }
.btn.ghost { background: var(--card); color: var(--ink); }
.btn.ghost:hover { background: var(--blue-tint); color: var(--blue); border-color: var(--blue); }
.ctas { display: flex; gap: 12px; flex-wrap: wrap; }

/* page head */
.page-head { padding: 44px 0 30px; }
.page-head .crumb { font: 12.5px var(--mono); color: var(--muted); margin-bottom: 14px; }
.page-head .crumb a { color: var(--muted); }
.page-head .lead { color: var(--ink-2); font-size: 18.5px; margin-top: 14px; max-width: 760px; }

/* troubleshooter */
.debugger { display: grid; grid-template-columns: 360px 1fr; min-height: 440px; }
@media (max-width: 900px) { .debugger { grid-template-columns: 1fr; } }
.debugger .left { border-right: 2px solid var(--ink); background: #f9fbfe; padding: 22px 0 16px; }
@media (max-width: 900px) { .debugger .left { border-right: 0; border-bottom: 2px solid var(--ink); } }
.debugger .left h4 { padding: 0 18px 10px; font: 700 11.5px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
#trail { list-style: none; margin: 0; padding: 0 18px; position: relative; }
#trail li { position: relative; padding-left: 0; }
#trail li + li::before { content: ""; position: absolute; left: 13px; top: -10px; height: 10px; border-left: 2px solid var(--ink); }
#trail button { width: 100%; display: grid; grid-template-columns: 28px 1fr; gap: 2px 10px; text-align: left; border: 1.5px solid var(--line); background: var(--card); padding: 9px 10px; margin-bottom: 10px; cursor: pointer; font: inherit; color: var(--ink); }
#trail button:hover { border-color: var(--blue); }
#trail .n { grid-row: span 2; font: 700 12px var(--mono); color: var(--blue); padding-top: 2px; }
#trail .q { font-size: 13.5px; color: var(--ink-2); line-height: 1.35; }
#trail .a { font: 700 13px var(--mono); color: var(--ink); }
#trail .hint { color: var(--muted); font-size: 14px; padding: 6px 0; }
#stage { padding: 30px 32px; }
@media (max-width: 640px) { #stage { padding: 22px 18px; } }
.node .step, .outcome .step { font: 700 11.5px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--blue); }
.outcome .step { color: var(--flag); }
.node h3, .outcome h3 { font-size: 26px; margin: 10px 0 8px; }
.node .help { color: var(--ink-2); margin-bottom: 18px; max-width: 640px; }
.opts { display: grid; gap: 10px; max-width: 640px; margin-top: 16px; }
.opts button { text-align: left; border: 2px solid var(--ink); background: var(--card); padding: 13px 16px; font: 600 16px var(--sans); color: var(--ink); cursor: pointer; display: flex; justify-content: space-between; }
.opts button::after { content: "→"; font-family: var(--mono); color: var(--blue); }
.opts button:hover { background: var(--blue-tint); border-color: var(--blue); }
.outcome .cause { background: var(--flag-tint); border-left: 4px solid var(--flag); padding: 12px 14px; color: var(--ink); margin: 10px 0 18px; max-width: 720px; }
.outcome h4 { font: 700 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 16px 0 6px; }
.outcome ol { margin: 0; padding-left: 22px; color: var(--ink-2); max-width: 720px; }
.outcome ol li { margin: 5px 0; }
.out-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }

/* index of troubleshooters / symptoms */
.trees { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 0; border: 2px solid var(--ink); background: var(--card); }
.trees a { display: grid; gap: 6px; padding: 18px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); align-content: start; }
.trees a:hover { background: var(--blue-tint); }
.trees a h3 { font-size: 18px; }
.trees a p { color: var(--muted); font-size: 14.5px; }
.symptoms { border: 2px solid var(--ink); background: var(--card); }
.symptoms a { display: grid; grid-template-columns: 110px 1fr auto; gap: 16px; padding: 14px 18px; border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); align-items: center; }
.symptoms a:last-child { border-bottom: 0; }
.symptoms a:hover { background: var(--blue-tint); }
.symptoms .plat { font: 700 11px var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--blue); }
.symptoms .t { font-weight: 600; }
.symptoms .t small { display: block; color: var(--muted); font-weight: 400; font-size: 14px; }
.symptoms .go { font-family: var(--mono); color: var(--blue); }
@media (max-width: 640px) { .symptoms a { grid-template-columns: 1fr; gap: 4px; } .symptoms .go { display: none; } }

/* all-paths map (static, crawlable) */
.map { border: 2px dashed var(--line); background: rgba(255,255,255,.7); padding: 16px 20px; }
.map ul { list-style: none; margin: 0; padding-left: 20px; border-left: 1.5px solid var(--line); }
.map > ul { padding-left: 0; border-left: 0; }
.map li { margin: 6px 0; font-size: 15px; color: var(--ink-2); }
.map .ans { font: 700 12.5px var(--mono); color: var(--blue); }
.map .res { color: var(--flag); font-weight: 600; }

/* sections */
section.block { padding: 60px 0; }
.sec-head { margin-bottom: 24px; max-width: 760px; }
.sec-head h2 { margin-top: 8px; }
.sec-head p { color: var(--ink-2); margin-top: 10px; font-size: 17px; }

/* article */
.article { max-width: 760px; margin: 0 auto; padding: 36px 32px 20px; background: var(--card); border: 2px solid var(--ink); }
@media (max-width: 640px) { .article { padding: 24px 18px; } }
.article h2 { font-size: 26px; margin: 36px 0 12px; }
.article h3 { margin: 24px 0 8px; font-size: 19px; }
.article p, .article li { color: var(--ink-2); font-size: 17px; line-height: 1.7; }
.article p { margin: 0 0 16px; }
.article ul, .article ol { padding-left: 22px; margin: 0 0 18px; }
.article table { width: 100%; border-collapse: collapse; margin: 6px 0 24px; font-size: 15px; border: 1.5px solid var(--ink); }
.article th, .article td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.article th { font: 700 11.5px var(--mono); letter-spacing: .06em; text-transform: uppercase; background: var(--blue-tint); }
.article .tldr { border: 1.5px solid var(--blue); background: var(--blue-tint); padding: 14px 16px; margin-bottom: 26px; }
.article .tldr p { margin: 0; color: var(--ink); }
.diag { display: grid; grid-template-columns: repeat(3, 1fr); border: 1.5px solid var(--ink); margin: 0 0 26px; }
@media (max-width: 760px) { .diag { grid-template-columns: 1fr; } }
.diag > div { padding: 14px; font-size: 15px; }
.diag > div + div { border-left: 1.5px solid var(--ink); }
@media (max-width: 760px) { .diag > div + div { border-left: 0; border-top: 1.5px solid var(--ink); } }
.diag .k { display: block; font: 700 11px var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--blue); margin-bottom: 6px; }
.prose { max-width: 740px; padding: 30px 32px; background: var(--card); border: 2px solid var(--ink); margin: 0 0 40px; }
.prose h2 { font-size: 23px; margin: 26px 0 10px; }
.prose p, .prose li { color: var(--ink-2); }
.prose p + p { margin-top: 12px; }

/* faq */
.faq { border: 2px solid var(--ink); background: var(--card); }
.faq details { border-bottom: 1px solid var(--line); padding: 15px 18px; }
.faq details:last-child { border-bottom: 0; }
.faq summary { cursor: pointer; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 700 18px var(--mono); color: var(--blue); }
.faq details[open] summary::after { content: "−"; }
.faq details p { color: var(--ink-2); margin-top: 8px; }

/* footer */
footer.site { background: var(--card); border-top: 2px solid var(--ink); padding: 44px 0 26px; margin-top: 30px; font-size: 14.5px; color: var(--muted); }
footer.site .cols { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 24px; }
@media (max-width: 760px) { footer.site .cols { grid-template-columns: 1fr 1fr; } }
footer.site h4 { font: 700 11.5px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink); margin-bottom: 10px; }
footer.site ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
footer.site a { color: var(--ink-2); text-decoration: none; }
footer.site a:hover { color: var(--blue); }
footer.site .bottom { margin-top: 30px; padding-top: 14px; border-top: 1px solid var(--line); font: 12px var(--mono); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }