:root {
  --ground: #eff2f6;
  --surface: #ffffff;
  --surface-sunk: #e7ebf1;
  --hairline: #d5dce5;
  --hairline-strong: #b9c4d1;
  --ink: #131922;
  --ink-muted: #5a6675;
  --ink-faint: #8593a3;
  --accent: #0f7f7a;
  --accent-soft: #d9edeb;
  --accent-ink: #0a5b57;
  --good: #3f8f5b;
  --warn: #b7791f;
  --crit: #c2453d;
  --good-soft: #e2f0e7;
  --warn-soft: #f8eed9;
  --crit-soft: #f8e3e1;
  --shadow: 0 1px 2px rgb(19 25 34 / 6%), 0 8px 24px -12px rgb(19 25 34 / 14%);

  --mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0f141a;
    --surface: #171e26;
    --surface-sunk: #111820;
    --hairline: #28323d;
    --hairline-strong: #3a4754;
    --ink: #e8edf3;
    --ink-muted: #94a2b2;
    --ink-faint: #6c7a8a;
    --accent: #2fc7bc;
    --accent-soft: #10312f;
    --accent-ink: #7fe0d8;
    --good: #59b47a;
    --warn: #d9a441;
    --crit: #e0685f;
    --good-soft: #16281d;
    --warn-soft: #2b2314;
    --crit-soft: #2e1917;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 8px 24px -12px rgb(0 0 0 / 60%);
  }
}

:root[data-theme="light"] {
  --ground: #eff2f6;
  --surface: #ffffff;
  --surface-sunk: #e7ebf1;
  --hairline: #d5dce5;
  --hairline-strong: #b9c4d1;
  --ink: #131922;
  --ink-muted: #5a6675;
  --ink-faint: #8593a3;
  --accent: #0f7f7a;
  --accent-soft: #d9edeb;
  --accent-ink: #0a5b57;
  --good: #3f8f5b;
  --warn: #b7791f;
  --crit: #c2453d;
  --good-soft: #e2f0e7;
  --warn-soft: #f8eed9;
  --crit-soft: #f8e3e1;
  --shadow: 0 1px 2px rgb(19 25 34 / 6%), 0 8px 24px -12px rgb(19 25 34 / 14%);
}

:root[data-theme="dark"] {
  --ground: #0f141a;
  --surface: #171e26;
  --surface-sunk: #111820;
  --hairline: #28323d;
  --hairline-strong: #3a4754;
  --ink: #e8edf3;
  --ink-muted: #94a2b2;
  --ink-faint: #6c7a8a;
  --accent: #2fc7bc;
  --accent-soft: #10312f;
  --accent-ink: #7fe0d8;
  --good: #59b47a;
  --warn: #d9a441;
  --crit: #e0685f;
  --good-soft: #16281d;
  --warn-soft: #2b2314;
  --crit-soft: #2e1917;
  --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 8px 24px -12px rgb(0 0 0 / 60%);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 20px 72px;
}
.wrap-narrow { max-width: 780px; }

a { color: var(--accent-ink); text-decoration-color: var(--hairline-strong); text-underline-offset: 2px; }
a:hover { text-decoration-color: var(--accent); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 99;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--accent);
  border-radius: 0 0 2px 0;
  padding: 10px 14px;
  font-size: 14px;
  text-decoration: none;
}
.skip-link:focus { left: 0; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--hairline);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 6px;
}
.eyebrow a { color: inherit; text-decoration: none; }
.eyebrow a:hover { color: var(--accent); }

h1 {
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.08;
  letter-spacing: -0.024em;
  font-weight: 650;
  margin: 0;
  text-wrap: balance;
}

.standfirst {
  margin: 8px 0 0;
  color: var(--ink-muted);
  max-width: 54ch;
}

.theme-toggle {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--surface);
  color: var(--ink-muted);
  border: 1px solid var(--hairline);
  border-radius: 2px;
  padding: 7px 11px;
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--hairline-strong); color: var(--ink); }

/* ---------- panels ---------- */

.panel {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  box-shadow: var(--shadow);
}

.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--hairline);
}

.panel-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0;
  font-weight: 500;
}

.panel-hint { font-family: var(--mono); font-size: 11px; color: var(--ink-faint); }
.panel-body { padding: 16px; }

input:focus-visible, select:focus-visible, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

footer.site-footer {
  margin-top: 34px;
  padding-top: 16px;
  border-top: 1px solid var(--hairline);
  font-size: 12.5px;
  color: var(--ink-faint);
  max-width: 72ch;
}

/* ---------- workbench (calculator) ---------- */

.bench {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 28px;
  align-items: start;
  margin-top: 26px;
}
@media (max-width: 940px) {
  .bench { grid-template-columns: minmax(0, 1fr); }
  .readout-col { order: -1; }
}
.col { display: flex; flex-direction: column; gap: 20px; min-width: 0; }

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(126px, 1fr));
  gap: 14px;
}
.field { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.field > label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

input[type="number"], input[type="search"], select {
  font-family: var(--mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  background: var(--surface-sunk);
  border: 1px solid var(--hairline);
  border-radius: 2px;
  padding: 8px 9px;
  width: 100%;
  min-width: 0;
}
input[type="search"] { font-family: var(--sans); }

.switches { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.switch { display: flex; gap: 9px; align-items: flex-start; cursor: pointer; font-size: 13.5px; }
.switch input { margin: 2px 0 0; accent-color: var(--accent); flex: none; }
.switch span { color: var(--ink-muted); }
.switch strong { color: var(--ink); font-weight: 550; }

.lib-controls { display: flex; gap: 10px; flex-wrap: wrap; }
.lib-controls > * { flex: 1 1 150px; min-width: 0; }
.lib-groups { margin-top: 16px; display: flex; flex-direction: column; gap: 16px; }
.lib-group-name {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 8px;
}
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-family: var(--sans);
  font-size: 13px;
  background: var(--surface-sunk);
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: 2px;
  padding: 5px 9px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  text-decoration: none;
}
.chip:hover { border-color: var(--accent); color: var(--accent-ink); }
.chip .chip-ram {
  font-family: var(--mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--ink-faint);
}
.chip:hover .chip-ram { color: var(--accent); }

.empty-note { color: var(--ink-faint); font-size: 13.5px; margin: 0; }

.rows { display: flex; flex-direction: column; }
.row, .row-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 74px 62px 58px 30px;
  gap: 10px;
  align-items: center;
}
.row { padding: 11px 0; border-bottom: 1px solid var(--hairline); }
.row:last-child { border-bottom: 0; }
.row-head {
  padding-bottom: 8px;
  border-bottom: 1px solid var(--hairline-strong);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.row-name { min-width: 0; }
.row-name b { font-weight: 550; display: block; font-size: 14px; }
.row-note { font-size: 12px; color: var(--ink-faint); display: block; margin-top: 1px; }

.seg { display: flex; border: 1px solid var(--hairline); border-radius: 2px; overflow: hidden; background: var(--surface-sunk); }
.seg button {
  flex: 1;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: none;
  border: 0;
  color: var(--ink-faint);
  padding: 5px 2px;
  cursor: pointer;
}
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--surface); }
.seg button:disabled { cursor: not-allowed; opacity: 0.45; }

.row input[type="number"] { padding: 5px 6px; font-size: 13px; text-align: right; }

.kill {
  background: none; border: 0; color: var(--ink-faint);
  font-size: 17px; line-height: 1; cursor: pointer; padding: 4px; border-radius: 2px;
}
.kill:hover { color: var(--crit); background: var(--crit-soft); }

/* ---------- readout ---------- */

.readout-col { position: sticky; top: 20px; display: flex; flex-direction: column; gap: 20px; }
@media (max-width: 940px) { .readout-col { position: static; } }

.verdict { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-bottom: 1px solid var(--hairline); }
.lamp { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.verdict-word { font-family: var(--mono); font-size: 12px; letter-spacing: 0.13em; text-transform: uppercase; font-weight: 600; }
.verdict-sub { font-size: 13px; color: var(--ink-muted); margin-left: auto; font-variant-numeric: tabular-nums; }
.v-good .lamp { background: var(--good); } .v-good .verdict-word { color: var(--good); }
.v-warn .lamp { background: var(--warn); } .v-warn .verdict-word { color: var(--warn); }
.v-crit .lamp { background: var(--crit); } .v-crit .verdict-word { color: var(--crit); }

.gauge { padding: 18px 16px 16px; }
.gauge-scale { position: relative; height: 11px; margin-bottom: 3px; }
.tick { position: absolute; top: 0; width: 1px; height: 5px; background: var(--hairline-strong); }
.tick-label {
  position: absolute; top: 5px; transform: translateX(-50%);
  font-family: var(--mono); font-size: 9px; color: var(--ink-faint); white-space: nowrap;
}
.bar {
  position: relative; display: flex; height: 34px;
  background: var(--surface-sunk); border: 1px solid var(--hairline);
  border-radius: 2px; overflow: hidden;
}
.bar-seg { height: 100%; min-width: 1px; }
.bar-seg + .bar-seg { border-left: 1px solid rgb(255 255 255 / 22%); }
.capline { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--ink); z-index: 3; }
.capline::after {
  content: attr(data-label);
  position: absolute; top: -15px; left: 50%; transform: translateX(-50%);
  font-family: var(--mono); font-size: 9px; letter-spacing: 0.06em; color: var(--ink); white-space: nowrap;
}

.legend { display: flex; flex-direction: column; gap: 5px; margin-top: 14px; font-size: 12.5px; }
.legend-item { display: flex; align-items: center; gap: 8px; }
.legend-swatch { width: 9px; height: 9px; border-radius: 1px; flex: none; }
.legend-name { color: var(--ink-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.legend-val {
  margin-left: auto; font-family: var(--mono); font-size: 12px;
  font-variant-numeric: tabular-nums; color: var(--ink); flex: none;
}

.metrics { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--hairline); }
.metric { padding: 12px 16px; border-bottom: 1px solid var(--hairline); }
.metric:nth-child(odd) { border-right: 1px solid var(--hairline); }
.metrics .metric:nth-last-child(-n+2):nth-child(odd) { border-bottom: 0; }
.metrics .metric:last-child { border-bottom: 0; }
.metric-label {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--ink-faint); display: block;
}
.metric-value {
  font-family: var(--mono); font-size: 19px; font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em; margin-top: 3px; display: block;
}
.metric-value small { font-size: 11px; color: var(--ink-faint); letter-spacing: 0; }
.m-good { color: var(--good); } .m-warn { color: var(--warn); } .m-crit { color: var(--crit); }

.advice { display: flex; flex-direction: column; }
.advice-item { display: flex; gap: 11px; padding: 12px 16px; border-bottom: 1px solid var(--hairline); font-size: 13.5px; }
.advice-item:last-child { border-bottom: 0; }
.advice-stripe { width: 3px; border-radius: 2px; flex: none; }
.a-crit .advice-stripe { background: var(--crit); }
.a-warn .advice-stripe { background: var(--warn); }
.a-tip .advice-stripe { background: var(--accent); }
.a-good .advice-stripe { background: var(--good); }
.advice-item p { margin: 0; color: var(--ink-muted); }
.advice-item strong { color: var(--ink); font-weight: 600; }

code {
  font-family: var(--mono); font-size: 12px;
  background: var(--surface-sunk); border: 1px solid var(--hairline);
  border-radius: 2px; padding: 1px 4px; color: var(--ink); word-break: break-all;
}

.cost-note { padding: 12px 16px; border-top: 1px solid var(--hairline); font-size: 12.5px; color: var(--ink-faint); }

@media (prefers-reduced-motion: no-preference) {
  .bar-seg, .metric-value { transition: all 180ms ease-out; }
}

/* ---------- article pages ---------- */

.article { margin-top: 26px; display: flex; flex-direction: column; gap: 22px; }

.spec-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(122px, 1fr));
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.spec {
  padding: 13px 15px;
  border-right: 1px solid var(--hairline);
}
.spec:last-child { border-right: 0; }
.spec-label {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-faint); display: block;
}
.spec-value {
  font-family: var(--mono); font-size: 20px; font-variant-numeric: tabular-nums;
  letter-spacing: -0.015em; display: block; margin-top: 3px;
}
.spec-value small { font-size: 11px; color: var(--ink-faint); letter-spacing: 0; }

.prose { max-width: 66ch; }
.prose h2 {
  font-size: 15px; font-weight: 600; letter-spacing: -0.005em;
  margin: 0 0 8px; color: var(--ink);
}
.prose p { margin: 0 0 14px; color: var(--ink-muted); }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--ink); font-weight: 600; }

.tips { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.tips li {
  display: flex; gap: 11px; padding: 12px 16px;
  border-bottom: 1px solid var(--hairline); font-size: 13.5px; color: var(--ink-muted);
}
.tips li:last-child { border-bottom: 0; }
.tips li::before {
  content: ""; width: 3px; border-radius: 2px; background: var(--accent); flex: none; align-self: stretch;
}

.calltoaction {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  padding: 15px 16px;
  background: var(--accent-soft);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  font-size: 13.5px;
  color: var(--ink-muted);
}
.calltoaction .cta-btn {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  background: var(--accent); color: var(--surface);
  border: 0; border-radius: 2px; padding: 9px 14px;
  text-decoration: none; white-space: nowrap;
}
.calltoaction .cta-btn:hover { filter: brightness(1.08); }

.related { display: flex; flex-wrap: wrap; gap: 6px; }

.cmp-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.cmp-table th, .cmp-table td {
  text-align: left; padding: 10px 16px; border-bottom: 1px solid var(--hairline);
}
.cmp-table th {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-faint); font-weight: 500;
}
.cmp-table td:not(:first-child), .cmp-table th:not(:first-child) {
  font-family: var(--mono); font-variant-numeric: tabular-nums; text-align: right;
}
.cmp-table tr:last-child td { border-bottom: 0; }
.table-scroll { overflow-x: auto; }

.index-grid { display: flex; flex-direction: column; gap: 20px; margin-top: 24px; }