:root {
  --ink: #0f1218;
  --ink-soft: #444d5c;
  --muted: #78818f;
  --paper: #ffffff;
  --ground: #ffffff;
  --grid: #e8ecf2;
  --rule: #dfe4eb;
  --rule-strong: #b6bfcd;
  --cobalt: #1d4ed8;
  --cobalt-deep: #1539a8;
  --cobalt-wash: #edf2ff;
  --magenta: #b8145c;
  --magenta-wash: #fdebf2;
  --green: #0b6b4f;
  --green-wash: #e6f5ef;
  --amber: #96620a;
  --amber-wash: #fdf3dd;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --fast: 200ms;
  --sans: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace;
  --max: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  font: 400 clamp(16px, 0.5vw + 14px, 17px) / 1.62 var(--sans);
  background-color: var(--ground);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: -1px -1px;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.1; margin: 0; font-weight: 800; }
h1 { font-size: clamp(2rem, 4.4vw, 3.2rem); letter-spacing: -0.032em; }
h2 { font-size: clamp(1.3rem, 2vw, 1.66rem); letter-spacing: -0.022em; }
h3 { font-size: 1.04rem; letter-spacing: -0.008em; }
p { margin: 0 0 1em; }
a { color: var(--ink); text-underline-offset: 3px; text-decoration-thickness: 2px; }
ul, ol { padding-left: 1.15em; margin: 0 0 1em; }
li { margin-bottom: 0.45em; }
strong { font-weight: 700; }
em { font-style: italic; }

.crumb-line, .mini-label, .eyebrow, .msg-tag, .fig-cap, .chip, .branch-tag, .node,
.flow-step .who, .clock-stop .at, .check-step .num, .brand .mark, .verdict-side .kicker,
.next-step .kicker, .why, table.data thead th, .footer strong {
  font-family: var(--mono);
}

.skip { position: absolute; left: -9999px; top: 0; padding: 12px 18px; background: var(--cobalt); color: #fff; z-index: 30; text-decoration: none; }
.skip:focus { left: 12px; top: 12px; }

/* ---------------------------------------------------------------- masthead */
.top { position: sticky; top: 0; z-index: 20; background: var(--paper); border-bottom: 3px solid var(--ink); }
.bar { max-width: var(--max); margin: 0 auto; padding: 11px 22px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 800; letter-spacing: -0.02em; margin-right: auto; font-size: 1.04rem; }
.brand .mark {
  display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 6px;
  background: var(--cobalt); color: #fff; font: 800 0.7rem/1 var(--mono); letter-spacing: 0.02em;
}
.menu { display: flex; gap: 3px; flex-wrap: wrap; }
.menu a {
  color: var(--ink-soft); text-decoration: none; font-size: 0.8rem; padding: 6px 10px; border-radius: 5px;
  border: 1px solid transparent;
  transition: color var(--fast) var(--ease), background var(--fast) var(--ease), border-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.menu a:hover { color: var(--cobalt-deep); background: var(--cobalt-wash); border-color: #c9d7fb; transform: translateY(-1px); }
.menu a[aria-current="page"] { color: #fff; background: var(--cobalt); border-color: var(--cobalt); }

/* ---------------------------------------------------------------- buttons */
.btn, .ghost {
  display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 6px;
  font-weight: 750; font-size: 0.87rem; text-decoration: none; border: 2px solid transparent;
  transition: transform var(--fast) var(--ease), background var(--fast) var(--ease), border-color var(--fast) var(--ease), color var(--fast) var(--ease);
}
.btn { background: var(--cobalt); color: #fff; }
.btn:hover { background: var(--cobalt-deep); transform: translateY(-1px); }
.ghost { background: var(--paper); color: var(--ink); border-color: var(--rule-strong); }
.ghost:hover { border-color: var(--ink); transform: translateY(-1px); }
.top .btn { padding: 8px 13px; font-size: 0.78rem; }

/* ---------------------------------------------------------------- shell */
.shell { max-width: var(--max); margin: 0 auto; padding: 0 22px 74px; }
main { display: block; }

.page-hero { padding: clamp(30px, 4.6vw, 52px) 0 26px; border-bottom: 3px solid var(--ink); margin-bottom: 34px; }
.crumb-line { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 15px; }
.eyebrow {
  display: inline-block; font-size: 0.69rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: #fff; background: var(--cobalt); padding: 5px 10px; border-radius: 5px; margin-bottom: 16px; font-weight: 700;
}
.hero-grid { display: grid; grid-template-columns: 1.55fr 1fr; gap: 34px; align-items: start; }
.page-hero h1 { max-width: 24ch; }
.lede { max-width: 62ch; margin-top: 15px; color: var(--ink-soft); font-size: 1.04rem; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 23px; }

/* route map card in the hero */
.routemap { background: var(--paper); border: 2px solid var(--ink); border-radius: 8px; padding: 18px; }
.routemap .rm-label { display: block; font: 700 0.65rem/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 14px; }
.routemap ol { list-style: none; margin: 0; padding: 0; }
.rm-stop { position: relative; padding: 0 0 16px 30px; }
.rm-stop:last-child { padding-bottom: 0; }
.rm-stop .rm-node {
  position: absolute; left: 0; top: 1px; width: 17px; height: 17px; border-radius: 50%;
  border: 2px solid var(--cobalt); background: var(--paper);
}
.rm-stop.open .rm-node { background: var(--magenta); border-color: var(--magenta); }
.rm-stop.done .rm-node { background: var(--green); border-color: var(--green); }
.rm-stop:not(:last-child)::after {
  content: ""; position: absolute; left: 8px; top: 20px; bottom: 2px; width: 2px; background: var(--rule-strong);
}
.rm-stop b { display: block; font-size: 0.9rem; }
.rm-stop span { font-size: 0.79rem; color: var(--muted); }

/* ---------------------------------------------------------------- blocks */
.block { margin-bottom: 48px; scroll-margin-top: 92px; }
main { counter-reset: sect; }
.block > h2 {
  display: flex; align-items: baseline; gap: 12px; padding-bottom: 12px; margin-bottom: 18px;
  border-bottom: 2px solid var(--rule-strong); max-width: 40ch;
}
.block > h2::before {
  content: counter(sect, decimal-leading-zero); counter-increment: sect;
  font: 800 0.72rem/1 var(--mono); color: #fff; background: var(--cobalt);
  padding: 5px 7px; border-radius: 4px; flex: none;
}

.mini-nav {
  display: flex; align-items: center; gap: 7px; flex-wrap: wrap; padding: 11px 13px;
  background: var(--paper); border: 1px solid var(--rule); border-left: 4px solid var(--cobalt);
  border-radius: 6px; margin-bottom: 28px;
}
.mini-label { font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-right: 4px; }
.mini-nav a {
  font-size: 0.78rem; text-decoration: none; color: var(--ink); padding: 4px 9px; border: 1px solid var(--rule-strong);
  border-radius: 5px; background: var(--paper);
  transition: border-color var(--fast) var(--ease), background var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.mini-nav a:hover { border-color: var(--cobalt); background: var(--cobalt-wash); transform: translateY(-1px); }

.note { background: var(--paper); border: 1px solid var(--rule); border-left: 4px solid var(--cobalt); padding: 15px 17px; border-radius: 6px; margin: 0 0 28px; }
.note p { margin: 6px 0 0; color: var(--ink-soft); font-size: 0.93rem; }
.msg-tag { font-size: 0.66rem; letter-spacing: 0.13em; text-transform: uppercase; color: var(--cobalt); font-weight: 700; }
.note-warn { border-left-color: var(--amber); background: var(--amber-wash); }
.note-warn .msg-tag { color: var(--amber); }

/* ---------------------------------------------------------------- flow rail */
.flow { margin: 24px 0 12px; background: var(--paper); border: 2px solid var(--ink); border-radius: 8px; padding: 20px 20px 6px; }
.fig-cap { display: block; font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 18px; font-weight: 700; }
.flow-list { list-style: none; margin: 0; padding: 0; }
.flow-step { position: relative; display: grid; grid-template-columns: auto 1fr; gap: 14px; padding-bottom: 20px; }
.flow-step:last-child { padding-bottom: 12px; }
.flow-step .node {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 8px; flex: none;
  background: var(--paper); border: 2px solid var(--cobalt); color: var(--cobalt-deep);
  font: 800 0.74rem/1 var(--mono); z-index: 1;
  transition: background var(--fast) var(--ease), color var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.flow-step:hover .node { background: var(--cobalt); color: #fff; transform: translateY(-2px); }
.flow-step.now .node { background: var(--cobalt); color: #fff; }
.flow-step .rail { position: absolute; left: 16px; top: 38px; bottom: 2px; width: 2px; background: var(--rule-strong); }
.flow-step b { display: block; }
.flow-step p { margin: 3px 0 4px; font-size: 0.92rem; color: var(--ink-soft); }
.flow-step .who { display: inline-block; font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }

/* ---------------------------------------------------------------- branch pair */
.branch { margin: 24px 0 12px; }
.branch .fig-cap { margin-bottom: 12px; }
.branch-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.branch-card { background: var(--paper); border: 2px solid var(--ink); border-radius: 8px; padding: 16px 17px 14px; position: relative; }
.branch-card.yes { border-top: 6px solid var(--green); }
.branch-card.no { border-top: 6px solid var(--magenta); }
.branch-tag { display: block; font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; font-weight: 700; }
.branch-card b { display: block; margin-bottom: 6px; }
.branch-card p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

/* ---------------------------------------------------------------- verdict */
.verdict { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: 22px 0 12px; background: var(--paper); border: 2px solid var(--ink); border-radius: 8px; overflow: hidden; }
.verdict-side { padding: 18px 18px 8px; }
.verdict-side + .verdict-side { border-left: 4px solid var(--ink); }
.verdict-side.can { background: var(--green-wash); }
.verdict-side.cannot { background: var(--magenta-wash); }
.verdict-side .kicker { display: block; font-size: 0.65rem; letter-spacing: 0.14em; text-transform: uppercase; font-weight: 700; margin-bottom: 10px; }
.verdict-side.can .kicker { color: var(--green); }
.verdict-side.cannot .kicker { color: var(--magenta); }
.verdict-side ul { padding-left: 1.1em; margin: 0; }
.verdict-side li { font-size: 0.9rem; color: var(--ink-soft); }

/* ---------------------------------------------------------------- chips */
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0 12px; }
.chip { font-size: 0.69rem; letter-spacing: 0.05em; padding: 5px 10px; border-radius: 5px; border: 1px solid var(--rule-strong); background: var(--paper); color: var(--ink-soft); font-weight: 700; }
.chip.c1 { color: #fff; background: var(--cobalt); border-color: var(--cobalt); }
.chip.c2 { color: #fff; background: var(--magenta); border-color: var(--magenta); }
.chip.c3 { color: var(--green); background: var(--green-wash); border-color: #b3ddca; }
.chip.c4 { color: var(--amber); background: var(--amber-wash); border-color: #e8d19a; }

/* ---------------------------------------------------------------- clock rail */
.clock { margin: 24px 0 12px; background: var(--paper); border: 2px solid var(--ink); border-radius: 8px; padding: 20px 20px 10px; }
.clock-rail { display: grid; gap: 0; }
.clock-stop { position: relative; padding: 0 0 18px 26px; border-left: 2px solid var(--rule-strong); }
.clock-stop:last-child { padding-bottom: 4px; border-left-color: transparent; }
.clock-stop .tick { position: absolute; left: -7px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: var(--paper); border: 2px solid var(--cobalt); }
.clock-stop.hot .tick { background: var(--magenta); border-color: var(--magenta); }
.clock-stop .at { display: block; font-size: 0.67rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); font-weight: 700; }
.clock-stop b { display: block; margin: 2px 0 3px; }
.clock-stop p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); max-width: 70ch; }

/* ---------------------------------------------------------------- checks */
.checks { display: grid; gap: 9px; margin: 22px 0 12px; }
.check-step {
  display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start;
  background: var(--paper); border: 1px solid var(--rule); border-left: 4px solid var(--cobalt);
  border-radius: 6px; padding: 13px 16px;
  transition: border-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.check-step:hover { border-left-color: var(--magenta); transform: translateX(3px); }
.check-step .num { font-size: 0.73rem; font-weight: 700; color: #fff; background: var(--cobalt); padding: 4px 6px; border-radius: 4px; }
.check-step b { display: block; margin-bottom: 3px; }
.check-step p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }
.check-step.done { border-left-color: var(--green); }
.check-step.done .num { background: var(--green); }

/* ---------------------------------------------------------------- tables */
.table-wrap { overflow-x: auto; border: 2px solid var(--ink); border-radius: 8px; background: var(--paper); margin: 22px 0 12px; }
table.data { border-collapse: collapse; width: 100%; min-width: 680px; font-size: 0.88rem; }
table.data caption { text-align: left; padding: 14px 16px 0; font-size: 0.78rem; color: var(--muted); }
table.data th, table.data td { text-align: left; padding: 12px 15px; border-top: 1px solid var(--rule); vertical-align: top; }
table.data thead th { background: var(--cobalt); color: #fff; font-size: 0.7rem; letter-spacing: 0.09em; text-transform: uppercase; font-weight: 700; border-top: 0; white-space: nowrap; }
table.data tbody tr { transition: background var(--fast) var(--ease); }
table.data tbody tr:hover { background: var(--cobalt-wash); }
table.data td:first-child { font-weight: 700; }

/* ---------------------------------------------------------------- plain lists */
ul.plain, ol.plain { list-style: none; padding-left: 0; margin: 18px 0 12px; }
ul.plain > li, ol.plain > li {
  background: var(--paper); border: 1px solid var(--rule); border-left: 3px solid var(--rule-strong);
  border-radius: 6px; padding: 13px 16px; margin-bottom: 9px;
  transition: border-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}
ul.plain > li:hover, ol.plain > li:hover { border-left-color: var(--cobalt); transform: translateX(2px); }
ul.dossier > li b { display: block; margin-bottom: 2px; }
ul.dossier > li .why { display: block; font-size: 0.79rem; color: var(--muted); }

/* ---------------------------------------------------------------- faq */
.faq { display: grid; gap: 9px; margin: 22px 0 12px; }
.faq-item { background: var(--paper); border: 1px solid var(--rule); border-radius: 6px; overflow: hidden; }
.faq-item summary { cursor: pointer; padding: 15px 17px; font-weight: 700; font-size: 0.98rem; list-style: none; display: flex; gap: 12px; align-items: flex-start; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: "+"; font-family: var(--mono); color: #fff; background: var(--cobalt); flex: none;
  width: 22px; height: 22px; display: grid; place-items: center; border-radius: 4px; font-size: 1rem; line-height: 1;
}
.faq-item[open] summary::before { content: "–"; background: var(--magenta); }
.faq-body { padding: 0 17px 4px 51px; color: var(--ink-soft); font-size: 0.92rem; }
.faq-body p { margin: 0 0 13px; }

/* ---------------------------------------------------------------- cta + disclosure */
.next-step {
  display: flex; align-items: center; gap: 22px; justify-content: space-between; flex-wrap: wrap;
  background: var(--cobalt); color: #dbe4ff; border-radius: 8px; padding: 24px 26px; margin: 42px 0 24px;
}
.next-step h2 { color: #fff; font-size: 1.18rem; margin: 4px 0 6px; }
.next-step p { margin: 0; color: #c2d1ff; font-size: 0.89rem; max-width: 54ch; }
.next-step .kicker { display: inline-block; font-size: 0.66rem; letter-spacing: 0.15em; text-transform: uppercase; color: #fff; }
.next-step .btn { background: #fff; color: var(--cobalt-deep); }
.next-step .btn:hover { background: #eef2ff; }

.disclosure { background: var(--paper); border: 1px solid var(--rule); border-left: 4px solid var(--amber); border-radius: 6px; padding: 15px 17px; font-size: 0.84rem; color: var(--ink-soft); }
.disclosure strong { color: var(--ink); }
.link-out { color: var(--ink); font-weight: 700; text-decoration-color: var(--cobalt); }

/* ---------------------------------------------------------------- footer */
.footer { background: var(--ink); color: #99a1ae; padding: 44px 22px 28px; margin-top: 22px; border-top: 4px solid var(--cobalt); }
.foot-grid { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 30px; }
.footer .brand { color: #fff; margin-bottom: 10px; }
.footer p { font-size: 0.85rem; color: #828b99; }
.footer strong { display: block; color: #fff; font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 11px; }
.footer a { display: block; color: #c0c7d2; text-decoration: none; font-size: 0.86rem; padding: 4px 0; transition: color var(--fast) var(--ease), transform var(--fast) var(--ease); }
.footer a:hover { color: #fff; transform: translateX(2px); }
.fine { max-width: var(--max); margin: 28px auto 0; font-size: 0.77rem; color: #79828f; border-top: 1px solid #262b34; padding-top: 18px; }

/* ---------------------------------------------------------------- narrow */
@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .branch-pair, .verdict { grid-template-columns: 1fr; }
  .verdict-side + .verdict-side { border-left: 0; border-top: 4px solid var(--ink); }
  .foot-grid { grid-template-columns: 1fr; gap: 22px; }
}
@media (max-width: 620px) {
  .bar { padding: 10px 16px; gap: 10px; }
  .shell { padding: 0 16px 56px; }
  .menu a { padding: 6px 8px; font-size: 0.75rem; }
  .flow-step .node { width: 30px; height: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .btn:hover, .ghost:hover, .menu a:hover, .mini-nav a:hover, ul.plain > li:hover,
  ol.plain > li:hover, .check-step:hover, .footer a:hover, .flow-step:hover .node {
    transform: none;
  }
}