/* Quantgrounds shared styles: warm paper surfaces, navy ink, mono numbers. Light theme only,
   so the site matches the PDF reports. Status colors match the PDF (docs/DESIGN.md). */
:root {
  --paper: #f7f6f2;
  --surface: #ffffff;
  --surface-2: #f1f0eb;
  --ink: #0e1628;
  --ink-2: #4a4f5c;
  --muted: #7d828d;
  --rule: #e4e2db;
  --rule-strong: #d2cfc5;
  --navy: #14213d;
  --accent: #2563d6;
  --accent-ink: #1d4fb0;
  --accent-soft: #e6eefb;

  --pass: #067647;   --pass-bg: #e7f6ec;
  --note: #475467;   --note-bg: #eef0f3;
  --warn: #b54708;   --warn-bg: #fdf3e2;
  --fail: #b42318;   --fail-bg: #fcebea;

  --series-strategy: #2563d6;
  --series-bench: #98a2b3;
  --series-pit: #e0662f;

  --code-bg: #0f172a;
  --code-ink: #e2e8f0;
  --shadow: 0 1px 2px rgba(14, 22, 40, .05), 0 8px 24px rgba(14, 22, 40, .06);
  --shadow-lg: 0 2px 4px rgba(14, 22, 40, .05), 0 24px 60px rgba(14, 22, 40, .12);
  --radius: 14px;
  --radius-sm: 8px;
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --max: 1160px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }
body {
  margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.6 var(--font-sans);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
code, pre, .mono { font-family: var(--font-mono); font-feature-settings: "zero" 1; }
code { font-size: .88em; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; color: var(--ink); }
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

h1, h2 { font-family: var(--font-serif); font-weight: 400; letter-spacing: -.015em; color: var(--ink); margin: 0; text-wrap: balance; }
h1 em, h2 em { font-style: italic; color: var(--accent-ink); }
h3, h4 { margin: 0; letter-spacing: -.01em; color: var(--ink); }
.eyebrow { font: 600 12px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent-ink); }

/* ---------- nav ---------- */
.nav { position: sticky; top: 0; z-index: 50; backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px);
  background: rgba(247, 246, 242, .86); border-bottom: 1px solid transparent; transition: border-color .2s; }
.nav.scrolled, .nav.solid { border-bottom-color: var(--rule); }
.nav .wrap { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -.02em; color: var(--ink); font-size: 17px; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 30px; height: 30px; border-radius: 7px; box-shadow: 0 1px 2px rgba(15, 21, 35, .18); flex: none; }
.nav-links { display: flex; gap: 22px; margin-left: 8px; }
.nav-links a { color: var(--ink-2); font-size: 14.5px; font-weight: 500; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); text-decoration: none; }
.nav-cta { margin-left: auto; display: flex; gap: 10px; align-items: center; }
.nav-chip { font: 600 11px/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2);
  border: 1px solid var(--rule-strong); border-radius: 999px; padding: 5px 9px; margin-left: -14px; }
@media (max-width: 860px) { .nav-links { display: none; } }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 42px; padding: 0 18px;
  border-radius: 10px; font: 600 14.5px/1 var(--font-sans); border: 1px solid transparent; cursor: pointer;
  transition: transform .08s ease, background .15s, border-color .15s, box-shadow .15s; white-space: nowrap; }
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--navy); color: #fff; box-shadow: 0 1px 0 rgba(255,255,255,.08) inset, 0 6px 16px rgba(20,33,61,.18); }
.btn-primary:hover { background: #1c2d52; color: #fff; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-ink); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
.btn-ghost:hover { background: var(--surface); border-color: var(--ink-2); color: var(--ink); }
.btn-sm { height: 34px; padding: 0 12px; font-size: 13.5px; border-radius: 8px; }
.btn-lg { height: 50px; padding: 0 24px; font-size: 16px; border-radius: 12px; }
.btn[disabled] { opacity: .55; cursor: not-allowed; transform: none; }
.arrow { width: 16px; height: 16px; flex: none; transition: transform .15s; }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- common bits ---------- */
.card { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); box-shadow: var(--shadow); }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; flex: none; }
.sev { display: inline-block; font: 700 10.5px/1 var(--font-mono); letter-spacing: .08em; padding: 5px 7px; border-radius: 5px; text-transform: uppercase; white-space: nowrap; }
.sev-critical, .sev-high { color: var(--fail); background: var(--fail-bg); }
.sev-medium { color: var(--warn); background: var(--warn-bg); }
.sev-low { color: var(--note); background: var(--note-bg); }
.sev-ok { color: var(--pass); background: var(--pass-bg); }
.status { display: inline-block; font: 600 12px/1 var(--font-sans); padding: 5px 9px; border-radius: 999px; white-space: nowrap; }
.status-pass { color: var(--pass); background: var(--pass-bg); }
.status-note { color: var(--note); background: var(--note-bg); }
.status-notrun, .status-notvalid { color: var(--muted); background: var(--note-bg); }
.status-warn { color: var(--warn); background: var(--warn-bg); }
.status-fail { color: var(--fail); background: var(--fail-bg); }
.neg { color: var(--fail); }

/* reference-range rows: a sub-score on a red / amber / green track (40 and 70 are the band edges) */
.rr { display: grid; grid-template-columns: 150px 1fr 34px; gap: 12px; align-items: center; font-size: 13px; }
.rr-label { color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rr-track { position: relative; height: 8px; border-radius: 99px;
  background: linear-gradient(90deg, #f4d5d2 0 40%, #f7e3bf 40% 70%, #cfeadb 70% 100%); }
.rr-mark { position: absolute; top: 50%; width: 14px; height: 14px; border-radius: 50%; transform: translate(-50%, -50%);
  background: var(--navy); border: 2.5px solid var(--surface); box-shadow: 0 0 0 1px var(--rule-strong); }
.rr-val { text-align: right; font-weight: 600; }
@media (max-width: 480px) { .rr { grid-template-columns: 118px 1fr 30px; font-size: 12px; } }

/* ---------- tables ---------- */
.tbl-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th { text-align: left; font: 600 11px/1.3 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted);
  padding: 8px 12px 9px 0; border-bottom: 1px solid var(--rule-strong); white-space: nowrap; }
.tbl td { padding: 10px 12px 10px 0; border-bottom: 1px solid var(--rule); vertical-align: top; color: var(--ink-2); }
.tbl td:first-child { color: var(--ink); }
.tbl .n { text-align: right; font-family: var(--font-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.tbl td:last-child, .tbl th:last-child { padding-right: 0; }
.tbl tr:last-child td { border-bottom: 0; }

/* ---------- code ---------- */
.codeblock { margin: 0; background: #070b14; color: #d7deea; border: 1px solid rgba(255,255,255,.1); border-radius: 12px;
  padding: 18px 20px; font: 13.5px/1.7 var(--font-mono); overflow-x: auto; tab-size: 4; }
.codeblock code { background: none; padding: 0; color: inherit; font-size: inherit; border-radius: 0; }
.codeblock .ln { display: inline-block; width: 26px; color: #4b5569; user-select: none; }
.codeblock .ln.hl { color: #ffb4a8; }
.codeblock .hl-line { background: rgba(208,59,59,.16); display: inline-block; min-width: 100%; }
.codeblock mark { background: rgba(208,59,59,.45); color: #fff; border-radius: 3px; padding: 0 2px; outline: 1px solid rgba(255,140,120,.7); }
.codeblock .kw { color: #c792ea; } .codeblock .fn { color: #82aaff; } .codeblock .st { color: #c3e88d; }
.codeblock .cm { color: #6b7894; font-style: italic; } .codeblock .nm { color: #f78c6c; }
.codeblock-light { background: #fdfcfa; color: #1f2937; border-color: var(--rule); box-shadow: var(--shadow); }
.codeblock-light .kw { color: #7c3aed; } .codeblock-light .fn { color: #1d4fb0; } .codeblock-light .st { color: #067647; }
.codeblock-light .cm { color: #8a8f98; } .codeblock-light .nm { color: #b54708; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--rule); padding: 40px 0 56px; color: var(--muted); font-size: 13.5px; }
.footer .wrap { display: grid; gap: 18px; }
.footer-top { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: center; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--ink-2); }
.disclaimer { max-width: 760px; line-height: 1.55; margin: 0; }

/* ---------- long-form pages (methodology) ---------- */
.doc { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; padding-top: 48px; padding-bottom: 88px; }
.doc-toc { position: sticky; top: 88px; align-self: start; font-size: 14px; }
.doc-toc b { display: block; margin-bottom: 12px; font: 600 11px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent-ink); }
.doc-toc ol { list-style: none; margin: 0; padding: 0 0 0 14px; display: grid; gap: 8px; border-left: 1px solid var(--rule-strong); }
.doc-toc a { color: var(--ink-2); }
.doc-toc a:hover { color: var(--ink); }
.doc-body { max-width: 780px; background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); box-shadow: var(--shadow); padding: 44px 52px; color: var(--ink-2); }
.doc-body h1 { font-size: clamp(40px, 5vw, 56px); line-height: 1.02; margin-bottom: 14px; }
.doc-body .lede { font-size: 18px; margin: 0 0 8px; }
.doc-body h2 { font-size: 32px; line-height: 1.1; margin: 48px 0 14px; padding-top: 28px; border-top: 1px solid var(--rule); }
.doc-body h3 { font-size: 17px; margin: 28px 0 8px; }
.doc-body p { margin: 0 0 1em; }
.doc-body ul, .doc-body ol { padding-left: 20px; margin: 0 0 1em; }
.doc-body li { margin: 5px 0; }
.doc-body b { color: var(--ink); font-weight: 600; }
.doc-body .tbl { margin: 8px 0 20px; }
.rule-list { list-style: none; padding: 0 !important; border-top: 1px solid var(--rule); }
.rule-list li { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 18px; padding: 12px 0; margin: 0 !important; border-bottom: 1px solid var(--rule); font-size: 15px; }
.formula { font: 14px/1.7 var(--font-mono); background: var(--surface-2); border-radius: var(--radius-sm); padding: 12px 16px; color: var(--ink); overflow-x: auto; }
@media (max-width: 900px) {
  .doc { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 24px; }
  .doc-toc { display: none; }
  .doc-body { padding: 28px 20px; }
  .rule-list li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
}

/* methodology: one block per test, a highlighted finding rule, boxed tables */
.test-block { border: 1px solid var(--rule); border-radius: 12px; padding: 22px 24px 20px; margin: 16px 0; background: var(--surface); }
.tb-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.tb-head h3 { margin: 0 !important; font-size: 18px; }
.tb-num { font: 600 11px/1 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--accent-ink);
  background: var(--accent-soft); padding: 5px 8px; border-radius: 6px; }
.test-block > p { margin: 0 0 14px; font-size: 15px; }
.test-block > ol { font-size: 15px; margin-bottom: 14px; }
.rule-box { background: var(--paper); border: 1px solid var(--rule); border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0; padding: 12px 16px 10px; }
.rule-box-label { font: 600 10.5px/1 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.rule-box ul { margin: 0 !important; padding-left: 18px; font-size: 14.5px; }
.rule-box li { margin: 3px 0 !important; }
.tbl-box { border: 1px solid var(--rule); border-radius: 10px; overflow: hidden; margin: 10px 0 18px; }
.tbl-box .tbl { margin: 0 !important; }
.tbl-box .tbl th { background: var(--surface-2); padding: 10px 14px; border-bottom: 1px solid var(--rule); }
.tbl-box .tbl td { padding: 11px 14px; }
.tbl-box .tbl td:first-child { font-weight: 600; white-space: nowrap; width: 1%; }
.tbl-box .tbl.wrap td, .tbl-box .tbl.wrap td:first-child { white-space: normal; width: auto; }
.tbl-box .tbl.wrap td.num { white-space: nowrap; }
.tbl-box .tbl.wrap th { white-space: normal; }
@media (max-width: 520px) { .tbl-box .tbl.wrap td.num { white-space: normal; } .tbl-box .tbl.wrap { font-size: 13px; } }
.tbl-box .tbl tr:nth-child(even) td { background: #fbfbf9; }
.test-block .tbl-box { margin: 4px 0 14px; }
@media (max-width: 640px) { .test-block { padding: 16px 14px; } .tbl-box .tbl td:first-child { white-space: normal; } }

/* Why an account: shared by the preview, the upgrade card and the signup page */
.perks { list-style: none; margin: 16px 0; padding: 0; display: grid; gap: 10px; }
.perks li { position: relative; padding-left: 28px; display: flex; flex-direction: column; gap: 2px; }
.perks li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 19px; height: 19px; border-radius: 50%;
  background: var(--pass-bg); color: var(--pass); font: 700 12px/19px var(--font-sans); text-align: center; }
.perks b { font-weight: 600; }
.perks span { color: var(--muted); font-size: .9rem; }
.nav-cta .auth-nav { display: flex; gap: 12px; align-items: center; }
.nav-signin { color: var(--ink-2); font-size: 14.5px; font-weight: 500; }
.nav-signin:hover { color: var(--ink); text-decoration: none; }
.nav-signin { white-space: nowrap; }
@media (max-width: 600px) { .nav-join { display: none; } }
@media (max-width: 440px) {
  .nav-cta .auth-nav + .btn { display: none; }
  .nav-signin { padding: 6px 12px; border: 1px solid var(--rule-strong); border-radius: var(--radius-sm); background: var(--surface); font-weight: 600; }
}