:root {
  --paper:        #fcfdfd;
  --surface:      #eef2f4;
  --surface-2:    #e2e8eb;
  --ink:          #101619;
  --ink-2:        #38474e;
  --muted:        #5f7178;
  --rule:         #cfd9dd;
  --rule-soft:    #dfe6e9;
  --accent:       #0b5d6e;
  --accent-soft:  #d7e8ec;
  --ok:           #1c6b45;
  --ok-soft:      #d8ebe0;
  --warn:         #8f5a06;
  --warn-soft:    #f3e5c8;
  --crit:         #a12a20;
  --crit-soft:    #f4dcd9;
  --code-bg:      #0f1b1f;
  --code-ink:     #cfe3e7;
  --code-dim:     #7d979d;
  --code-good:    #7fd6b0;
  --code-bad:     #f0a196;

  --f-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --measure: 68ch;
  --pad: clamp(20px, 5vw, 56px);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:       #0d1316;
    --surface:     #161f23;
    --surface-2:   #1e2a2f;
    --ink:         #e8eef0;
    --ink-2:       #b6c5ca;
    --muted:       #8298a0;
    --rule:        #2b3a40;
    --rule-soft:   #223035;
    --accent:      #56b6c8;
    --accent-soft: #16333a;
    --ok:          #63c493;
    --ok-soft:     #163024;
    --warn:        #dfae5c;
    --warn-soft:   #33280f;
    --crit:        #e88a80;
    --crit-soft:   #351a17;
    --code-bg:     #060c0e;
    --code-ink:    #cfe3e7;
    --code-dim:    #6c868c;
  }
}
:root[data-theme="dark"] {
  --paper:       #0d1316;
  --surface:     #161f23;
  --surface-2:   #1e2a2f;
  --ink:         #e8eef0;
  --ink-2:       #b6c5ca;
  --muted:       #8298a0;
  --rule:        #2b3a40;
  --rule-soft:   #223035;
  --accent:      #56b6c8;
  --accent-soft: #16333a;
  --ok:          #63c493;
  --ok-soft:     #163024;
  --warn:        #dfae5c;
  --warn-soft:   #33280f;
  --crit:        #e88a80;
  --crit-soft:   #351a17;
  --code-bg:     #060c0e;
  --code-ink:    #cfe3e7;
  --code-dim:    #6c868c;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
img { max-width: 100%; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 15.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--pad) var(--pad) 96px;
}

/* ---- shell: side nav + content ---- */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--paper);
  padding: 10px 16px;
  z-index: 10;
  font-family: var(--f-mono);
  font-size: 12px;
}
.skip:focus { left: 0; }

.layout {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  align-items: start;
}

.sidenav {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100dvh;
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--rule);
  padding: 26px 16px 22px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.brand { display: grid; gap: 2px; text-decoration: none; padding: 0 8px; }
.brand-t {
  font-family: var(--f-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.brand-s {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.navlist { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; max-width: none; }
.navlist li { margin: 0; }
.navlist a {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 9px;
  align-items: baseline;
  padding: 8px 8px 8px 9px;
  text-decoration: none;
  border-left: 2px solid transparent;
  color: var(--ink-2);
}
.navlist a:hover { background: var(--surface-2); color: var(--ink); }
.navlist li.on a {
  border-left-color: var(--accent);
  background: var(--paper);
  color: var(--ink);
}
.nav-n {
  font-family: var(--f-mono);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.navlist li.on .nav-n { color: var(--accent); }
.nav-l { font-size: 13.5px; line-height: 1.3; }
.navlist li.on .nav-l { font-weight: 600; }

.navfoot {
  margin: auto 0 0;
  padding: 14px 8px 0;
  border-top: 1px solid var(--rule);
  font-family: var(--f-mono);
  font-size: 10.5px;
  line-height: 1.6;
  color: var(--muted);
  max-width: none;
}
.navfoot code { background: none; padding: 0; font-size: 10.5px; }

.content {
  min-width: 0;
  max-width: 1040px;
  padding: var(--pad) var(--pad) 80px;
}
.content > section:first-of-type { margin-top: 0; }
.content > .masthead + .verdict { margin-top: 30px; }

/* ---- pager ---- */
.pager {
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
}
.pg {
  display: grid;
  gap: 3px;
  text-decoration: none;
  border: 1px solid var(--rule);
  padding: 12px 16px;
  min-width: 200px;
  background: var(--paper);
}
.pg:hover { border-color: var(--accent); }
.pg.next { text-align: right; margin-left: auto; }
.pg-d {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.pg-l {
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* ---- overview summary cards ---- */
.summary {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-bottom: 8px;
}
.scard {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 18px 20px 20px;
  background: var(--paper);
  text-decoration: none;
}
.scard:hover { background: var(--surface); }
.scard-n {
  font-family: var(--f-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.scard-t {
  font-family: var(--f-display);
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--ink);
}
.scard-d { font-size: 13.5px; line-height: 1.5; color: var(--ink-2); }

/* ---- lose / gain ledger ---- */
.ledger {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
  margin-bottom: 8px;
}
.ledger-col { border: 1px solid var(--rule); padding: 4px 22px 20px; }
.ledger-col.lose { border-top: 3px solid var(--crit); }
.ledger-col.gain { border-top: 3px solid var(--ok); }
.ledger-col h3 {
  display: grid;
  gap: 5px;
  margin: 20px 0 14px;
  font-size: 18px;
}
.ledger-tag {
  font-family: var(--f-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.ledger-col.lose .ledger-tag { color: var(--crit); }
.ledger-col.gain .ledger-tag { color: var(--ok); }
.ledger-col ul { margin: 0; padding-left: 18px; max-width: none; }
.ledger-col li { margin-bottom: 11px; font-size: 14px; line-height: 1.5; color: var(--ink-2); }
.ledger-col li strong { color: var(--ink); }
.ledger-col li::marker { color: var(--muted); }

/* ---- masthead ---- */
.masthead {
  display: grid;
  gap: 18px;
  padding-bottom: 26px;
  border-bottom: 2px solid var(--ink);
}
.kicker {
  font-family: var(--f-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: baseline;
}
.kicker .sep { color: var(--rule); }
h1 {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 50px);
  line-height: 1.03;
  letter-spacing: -0.022em;
  margin: 0;
  text-wrap: balance;
}
.standfirst {
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-2);
  max-width: var(--measure);
  margin: 0;
}
.standfirst strong { color: var(--ink); font-weight: 600; }
.byline {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

/* ---- verdict banner ---- */
.verdict {
  margin-top: 30px;
  display: grid;
  grid-template-columns: auto 1fr;
  border: 1px solid var(--rule);
  background: var(--surface);
  overflow: hidden;
}
.verdict .stripe { width: 6px; background: var(--accent); }
.verdict .vbody { padding: 20px 24px; display: grid; gap: 8px; }
.verdict h2 {
  font-family: var(--f-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}
.verdict p { margin: 0; color: var(--ink-2); max-width: 74ch; }
.verdict .figure {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
}

/* ---- sections ---- */
section { margin-top: 60px; }
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 10px;
  margin-bottom: 26px;
}
.sec-num {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.06em;
  flex: none;
}
h2.sec-title {
  font-family: var(--f-display);
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1.15;
  margin: 0;
  text-wrap: balance;
}
h3 {
  font-family: var(--f-display);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 34px 0 10px;
}
h4 {
  font-family: var(--f-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 26px 0 10px;
}
p { max-width: var(--measure); }
p, ul, ol { margin: 0 0 14px; }
ul, ol { padding-left: 22px; max-width: var(--measure); }
li { margin-bottom: 7px; }
a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
strong { font-weight: 600; }

/* ---- terminal evidence block ---- */
.term {
  background: var(--code-bg);
  color: var(--code-ink);
  font-family: var(--f-mono);
  font-size: 12.5px;
  line-height: 1.72;
  padding: 18px 20px;
  overflow-x: auto;
  border-left: 3px solid var(--accent);
  margin: 0 0 8px;
}
.term .c { color: var(--code-dim); }
.term .hl { color: var(--code-good); }
.term .bad { color: var(--code-bad); }
.caption {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--muted);
  margin: 0 0 22px;
  max-width: 80ch;
}

/* ---- option cards ---- */
.options { display: grid; gap: 16px; }
.opt {
  display: grid;
  grid-template-columns: 6px 1fr;
  border: 1px solid var(--rule);
  background: var(--paper);
}
.opt .stripe { background: var(--rule); }
.opt.reject .stripe { background: var(--crit); }
.opt.bridge .stripe { background: var(--warn); }
.opt.pick   .stripe { background: var(--ok); }
.opt-body { padding: 20px 24px 22px; display: grid; gap: 12px; }
.opt-top { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; }
.opt-label {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.opt-name {
  font-family: var(--f-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.012em;
  margin: 0;
  flex: 1 1 240px;
}
.chip {
  font-family: var(--f-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 9px;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.chip.reject { color: var(--crit); background: var(--crit-soft); }
.chip.bridge { color: var(--warn); background: var(--warn-soft); }
.chip.pick   { color: var(--ok);   background: var(--ok-soft); }
.opt-cost {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}
.opt-body p, .opt-body ul { max-width: 82ch; }
.opt-body ul { margin-bottom: 0; }

/* ---- tables ---- */
.tscroll { overflow-x: auto; margin: 0 0 10px; border: 1px solid var(--rule); }
table { border-collapse: collapse; width: 100%; font-size: 14px; min-width: 520px; }
caption {
  text-align: left;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 12px 14px 10px;
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
  font-weight: 600;
}
th, td { padding: 9px 14px; text-align: left; border-bottom: 1px solid var(--rule-soft); vertical-align: top; }
thead th {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
}
td.num, th.num { text-align: right; font-family: var(--f-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
tbody tr:last-child td { border-bottom: none; }
tr.total td {
  border-top: 2px solid var(--ink);
  font-weight: 600;
  background: var(--surface);
}
tr.sub td { color: var(--muted); font-size: 13px; }
code {
  font-family: var(--f-mono);
  font-size: 0.9em;
  background: var(--surface-2);
  padding: 1px 5px;
}

/* ---- head-to-head comparison matrix ---- */
.matrix { min-width: 720px; }
.matrix th.dim { width: 27%; }
.matrix thead th.col-a,
.matrix thead th.col-b,
.matrix thead th.col-c { width: 24.33%; font-size: 12px; }
.matrix thead th.col-c { background: var(--ok-soft); color: var(--ok); }
.matrix td.col-c { background: var(--ok-soft); }
.matrix td.dim { font-weight: 600; color: var(--ink); }
.mark {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 3px;
}
.mark.yes { color: var(--ok); }
.mark.no { color: var(--crit); }
.mark.part { color: var(--warn); }
.matrix .note { display: block; color: var(--ink-2); font-size: 13px; line-height: 1.45; }
.matrix td.col-c .note { color: var(--ink); }

/* ---- chart ---- */
figure { margin: 0 0 12px; }
.chartbox { border: 1px solid var(--rule); background: var(--surface); padding: 14px; overflow-x: auto; }
svg { display: block; min-width: 560px; }
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--ink-2);
  padding: 12px 2px 2px;
}
.legend span { display: inline-flex; align-items: center; gap: 7px; }
.swatch { width: 16px; height: 3px; flex: none; display: inline-block; }
.swatch.crit { background: var(--crit); }
.swatch.ok { background: var(--ok); height: 10px; }
.swatch.build { background: var(--accent-soft); border: 1px solid var(--accent); height: 10px; }

.matrix thead th.col-c em { font-style: normal; font-weight: 400; text-transform: none; letter-spacing: 0; }

/* ---- phase list ---- */
.phases { list-style: none; padding: 0; margin: 0; max-width: none; display: grid; }
.phase {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 0 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule-soft);
  margin: 0;
}
.phase:first-child { border-top: 1px solid var(--rule); }
.ph-meta { display: grid; gap: 3px; align-content: start; }
.ph-n {
  font-family: var(--f-mono);
  font-size: 19px;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.ph-dur {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.ph-body { display: grid; gap: 6px; }
.ph-body h3 { margin: 0; font-size: 16px; }
.ph-body p, .ph-body ul { margin: 0; max-width: 78ch; }
.ph-hours {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ---- callout ---- */
.callout {
  border: 1px solid var(--warn);
  background: var(--warn-soft);
  padding: 16px 20px;
  margin: 0 0 20px;
  display: grid;
  gap: 8px;
}
.callout.crit { border-color: var(--crit); background: var(--crit-soft); }
.callout.good { border-color: var(--ok); background: var(--ok-soft); }
.callout h4 { margin: 0; color: var(--warn); }
.callout.crit h4 { color: var(--crit); }
.callout.good h4 { color: var(--ok); }
.callout p, .callout ul { margin: 0; color: var(--ink); max-width: 78ch; }
.callout li { margin-bottom: 5px; }

/* ---- q list ---- */
.qlist { list-style: none; padding: 0; margin: 0; max-width: none; display: grid; gap: 14px; }
.qlist li {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 12px;
  margin: 0;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule-soft);
}
.qlist li:last-child { border-bottom: none; padding-bottom: 0; }
.qn {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  padding-top: 3px;
}
.qtext { display: grid; gap: 4px; }
.qtext b { font-weight: 600; }
.qtext span { color: var(--ink-2); font-size: 14px; }

footer {
  margin-top: 70px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--muted);
  display: grid;
  gap: 5px;
}

/* ---- narrow: nav becomes a scrolling strip above the content ---- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidenav {
    position: static;
    height: auto;
    overflow: visible;
    border-right: none;
    border-bottom: 1px solid var(--rule);
    padding: 18px 16px 0;
    gap: 14px;
  }
  .navlist {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 2px;
  }
  .navlist a {
    grid-template-columns: 1fr;
    gap: 1px;
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 6px 12px 9px;
  }
  .navlist li.on a { border-left-color: transparent; border-bottom-color: var(--accent); background: none; }
  .navfoot { display: none; }
  .content { padding-top: 26px; }
}

@media (max-width: 620px) {
  .phase { grid-template-columns: 1fr; gap: 8px; }
  .ph-meta { display: flex; gap: 12px; align-items: baseline; }
  .verdict { grid-template-columns: 1fr; }
  .verdict .stripe { width: auto; height: 5px; }
  .pg { min-width: 0; flex: 1 1 100%; }
  .pg.next { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}