:root {
  --paper: #f4efe4;
  --paper-2: #fbf8f1;
  --paper-3: #eee7d8;
  --ink: #191712;
  --muted: #6d6457;
  --faint: #857b6c;
  --rule: #d8cfbf;
  --red: #a93b2a;
  --green: #2e6b4a;
  --green-light: #6a9a7e;
  --amber: #9a6a22;
  --blue: #405f86;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; }

:focus-visible { outline: 2px solid var(--red); outline-offset: 3px; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 239, 228, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px clamp(20px, 4vw, 56px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.brand.small { font-size: 15px; }
.dot { color: var(--red); }

.nav nav { display: flex; align-items: center; gap: clamp(14px, 2.4vw, 30px); }
.nav nav a { font-size: 13.5px; color: var(--muted); }
.nav nav a:hover { color: var(--ink); }
.nav .download {
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}

main { display: block; }
.hero, .section, .receipts, footer {
  padding-left: clamp(20px, 4vw, 56px);
  padding-right: clamp(20px, 4vw, 56px);
}

/* ---------- hero ---------- */
.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding-top: clamp(48px, 7vw, 92px);
  padding-bottom: clamp(36px, 5vw, 64px);
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

.eyebrow, .section-no, .card-tag {
  color: var(--red);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(42px, 6.2vw, 78px);
  line-height: 1.01;
  letter-spacing: -0.025em;
  margin: 14px 0 20px;
}
h1 em {
  font-style: italic;
  font-weight: 600;
  color: var(--red);
}

.lede {
  max-width: 560px;
  color: var(--muted);
  font-size: clamp(16px, 1.7vw, 18.5px);
  line-height: 1.6;
  margin: 0 0 26px;
}

.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; }
.btn {
  display: inline-block;
  background: var(--ink);
  color: var(--paper-2);
  padding: 12px 20px;
  border-radius: 3px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--ink);
}
.btn:hover { background: #2b2720; }
.text-link { font-size: 14px; color: var(--red); border-bottom: 1px solid rgba(169, 59, 42, 0.35); padding-bottom: 2px; }
.text-link:hover { border-bottom-color: var(--red); }

.fineprint { color: var(--faint); font-size: 12px; margin: 20px 0 0; }

/* ---------- mail card ---------- */
.mail {
  margin: 0;
  justify-self: end;
  width: min(100%, 520px);
  min-height: 420px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 5px;
  box-shadow: 0 18px 50px rgba(25, 23, 18, 0.10);
  padding: 20px 24px 16px;
  transition: opacity 0.16s ease;
}
.mail.swapping { opacity: 0.35; }
.mail-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--faint);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 10px;
}
.mail-subject {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  padding: 12px 0;
  border-bottom: 1px dashed var(--rule);
}
.mail-row {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 14px;
  padding: 14px 0 4px;
}
.stamp {
  display: inline-block;
  align-self: start;
  justify-self: start;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 3px 7px;
  border: 1px solid currentColor;
  border-radius: 2px;
  transform: rotate(-2deg);
}
.stamp.red { color: var(--red); }
.stamp.green { color: var(--green); }
.mail-before, .mail-after { margin: 0; font-size: 13.5px; line-height: 1.65; }
.mail-before { color: var(--muted); }
.mail-after { color: var(--ink); font-size: 14px; }
.mail-arrow { color: var(--red); font-size: 18px; line-height: 1; padding: 2px 0 2px 82px; }
.mail figcaption {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  border-top: 1px solid var(--rule);
  margin-top: 12px;
  padding-top: 10px;
  color: var(--faint);
  font-size: 11.5px;
}
.text-button {
  appearance: none;
  background: none;
  border: 0;
  color: var(--red);
  cursor: pointer;
  padding: 0;
  font-size: 11.5px;
  font-weight: 600;
}
.text-button:hover { text-decoration: underline; }

/* ---------- receipts ---------- */
.receipts {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding-top: 20px;
  padding-bottom: 20px;
}
.receipts > div {
  padding: 0 20px;
  border-right: 1px solid var(--rule);
}
.receipts > div:first-child { padding-left: 0; }
.receipts > div:last-child { border-right: 0; }
.receipts b {
  display: block;
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.receipts span { color: var(--muted); font-size: 12px; }

/* ---------- sections ---------- */
.section {
  max-width: 1120px;
  margin: 0 auto;
  padding-top: clamp(52px, 7vw, 88px);
  padding-bottom: 4px;
}
.section-head { max-width: 760px; margin-bottom: 24px; }
h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(31px, 4.2vw, 50px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 10px 0 14px;
}
.section-head p { color: var(--muted); margin: 0; font-size: 15.5px; }
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--paper-3);
  padding: 1px 5px;
  border-radius: 2px;
}

.receipt-line {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 40px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 13px 0;
  margin-bottom: 18px;
}
.receipt-line > div { display: flex; align-items: baseline; gap: 9px; }
.receipt-line b { font-family: var(--serif); font-size: 22px; font-weight: 600; }
.receipt-line span { color: var(--muted); font-size: 12.5px; }

.panel {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: clamp(18px, 2.6vw, 28px);
}
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 6px;
}
.panel h3 { font-family: var(--serif); font-weight: 600; font-size: 22px; margin: 0; letter-spacing: -0.01em; }
.panel-sub { color: var(--faint); font-size: 12.5px; margin: 5px 0 0; max-width: 620px; }

/* tabs */
.seg { display: flex; gap: 20px; border-bottom: 1px solid var(--rule); margin-bottom: 4px; }
.seg button {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 8px 1px;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
}
.seg button:hover { color: var(--ink); }
.seg button.active { color: var(--ink); border-bottom-color: var(--red); font-weight: 600; }
.panel-head .seg {
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 3px;
  gap: 2px;
  margin: 0;
  flex: 0 0 auto;
}
.panel-head .seg button { border: 0; border-radius: 2px; margin: 0; padding: 6px 12px; }
.panel-head .seg button.active { background: var(--ink); color: var(--paper-2); }
.seg-wrap { margin-bottom: 6px; }

.chart { width: 100%; height: 480px; }

/* mobile per-item list replaces the chart under 760px */
.flag-list { display: none; margin-top: 8px; border-top: 1px solid var(--rule); }
.flag-row {
  border-bottom: 1px solid var(--rule);
  border-left: 3px solid var(--rule);
  padding: 10px 10px 10px 12px;
}
.flag-row.crossed { border-left-color: var(--green); }
.flag-row.worse { border-left-color: var(--red); }
.flag-row.still { border-left-color: var(--amber); }
.fr-top { display: flex; justify-content: space-between; gap: 10px; }
.fr-sub { font-size: 12.5px; color: var(--ink); }
.fr-d { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.fr-bottom {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}
.fr-bottom b { color: var(--ink); }
.fr-tag {
  margin-left: auto;
  font-size: 9.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--faint);
}
.flag-row.crossed .fr-tag { color: var(--green); }
.flag-row.worse .fr-tag { color: var(--red); }
.flag-row.still .fr-tag { color: var(--amber); }

.stat-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 0;
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}
.stat-line span { white-space: nowrap; }
.stat-line span + span::before { content: "·"; color: var(--faint); margin: 0 10px; }
.stat-line b { color: var(--ink); font-weight: 600; }
.stat-line .good b { color: var(--green); }
.stat-line .warn b { color: var(--amber); }
.stat-line .bad b { color: var(--red); }

.caveat { color: var(--faint); font-size: 12.5px; font-style: italic; margin: 12px 0 0; }

details { margin-top: 16px; border-top: 1px solid var(--rule); padding-top: 12px; }
summary { cursor: pointer; color: var(--muted); font-size: 12.5px; font-weight: 600; }
summary:hover { color: var(--ink); }

.table-wrap { overflow-x: auto; margin-top: 10px; }
table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
th, td { text-align: right; padding: 8px 10px; border-bottom: 1px solid var(--rule); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { color: var(--faint); font-weight: 600; font-size: 10px; letter-spacing: 0.07em; text-transform: uppercase; }
td { color: var(--muted); font-variant-numeric: tabular-nums; }
td b { color: var(--ink); font-weight: 600; }
tr.rec td { background: rgba(46, 107, 74, 0.06); }
tr.rec td:first-child { color: var(--green); font-weight: 600; }

.note {
  margin-top: 18px;
  border-left: 3px solid var(--ink);
  background: var(--paper-2);
  padding: 13px 16px;
  color: var(--muted);
  font-size: 13px;
}
.note.red { border-left-color: var(--red); }
.note b { color: var(--ink); }

/* meters */
.meters { margin: 12px 0 16px; }
.meter-row {
  display: grid;
  grid-template-columns: 172px 1fr 74px;
  gap: 16px;
  align-items: center;
  padding: 9px 8px;
  border-bottom: 1px solid var(--rule);
}
.meter-row.rec { background: rgba(46, 107, 74, 0.055); }
.meter-label { font-size: 12.5px; color: var(--ink); }
.meter-row.rec .meter-label::after { content: " ★"; color: var(--green); }
.meter-track { height: 6px; background: var(--paper-3); border-radius: 1px; overflow: hidden; }
.meter-fill { height: 100%; background: var(--ink); transition: width 0.4s ease; }
.meter-fill.green { background: var(--green); }
.meter-fill.greenlight { background: var(--green-light); }
.meter-fill.blue { background: var(--blue); }
.meter-fill.amber { background: var(--amber); }
.meter-val { text-align: right; font-size: 12.5px; color: var(--ink); font-variant-numeric: tabular-nums; }

.compare-note { margin: 14px 0 0; color: var(--muted); font-size: 13px; }
.compare-note a { color: var(--red); border-bottom: 1px solid rgba(169, 59, 42, 0.35); }

.tradeoff-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}
.card {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--red);
  border-radius: 3px;
  padding: 18px;
}
.card:nth-child(2) { border-top-color: var(--green); }
.card:nth-child(3) { border-top-color: var(--amber); }
.card h3 { font-family: var(--serif); font-weight: 600; font-size: 20px; margin: 6px 0 8px; }
.card p { margin: 0; color: var(--muted); font-size: 13.5px; }
.card b { color: var(--ink); }

/* use */
.use-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 16px; }
.code-panel { display: flex; flex-direction: column; background: #201d18; border-color: #201d18; }
.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #b8ad9b;
  font-size: 11.5px;
  margin-bottom: 10px;
}
.copy {
  appearance: none;
  background: transparent;
  border: 1px solid #4a4337;
  color: #d8cdbb;
  border-radius: 2px;
  padding: 4px 9px;
  font-size: 11.5px;
  cursor: pointer;
}
.copy:hover { border-color: #8a7d68; color: #fff; }
pre {
  margin: 0;
  background: #171410;
  border: 1px solid #3a342b;
  border-radius: 3px;
  padding: 15px;
  overflow-x: auto;
  flex: 1;
}
pre code { font-family: var(--mono); font-size: 12px; color: #e8dfcf; background: none; padding: 0; }
.code-foot {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
  color: #b8ad9b;
  font-size: 11.5px;
}
.code-foot a { color: #a8d5b8; }

.samples { display: grid; gap: 12px; }
.sample {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 14px 16px;
}
.sample .sample-top {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--faint);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 7px;
}
.sample .s-before, .sample .s-after { margin: 0; font-size: 12.5px; line-height: 1.6; }
.sample .s-before { color: var(--muted); }
.sample .s-after { color: var(--ink); margin-top: 9px; }
.sample .s-lab { font-size: 9.5px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--red); }
.sample .s-lab.green { color: var(--green); }

footer {
  max-width: 1120px;
  margin: 64px auto 0;
  padding-top: 22px;
  padding-bottom: 40px;
  border-top: 1px solid var(--rule);
  display: flex;
  align-items: baseline;
  gap: 12px;
  color: var(--faint);
  font-size: 11.5px;
}
.foot-note { color: var(--muted); }
.foot-links { margin-left: auto; display: flex; gap: 18px; }
.foot-links a:hover { color: var(--ink); }

@media (max-width: 940px) {
  .hero { grid-template-columns: 1fr; }
  .mail { justify-self: start; width: min(100%, 560px); }
  .receipts { grid-template-columns: 1fr 1fr; }
  .receipts > div { padding: 10px 16px; border-right: 0; }
  .receipts > div:first-child { padding-left: 16px; }
  .compare-note { margin: 14px 0 0; color: var(--muted); font-size: 13px; }
.compare-note a { color: var(--red); border-bottom: 1px solid rgba(169, 59, 42, 0.35); }

.tradeoff-grid { grid-template-columns: 1fr; }
  .use-grid { grid-template-columns: 1fr; }
  .nav nav a:not(.download) { display: none; }
}
@media (max-width: 760px) {
  .chart { display: none; }
  .flag-list { display: block; }
}
@media (max-width: 560px) {
  .receipts { grid-template-columns: 1fr 1fr; }
  .receipts b { font-size: 22px; }
  .panel-head { flex-direction: column; }
  .chart { height: 420px; }
  .meter-row { grid-template-columns: 116px 1fr 58px; gap: 10px; }
  .meter-label { font-size: 11.5px; }
  .mail { padding: 16px; }
  .mail-row { grid-template-columns: 1fr; gap: 6px; }
  .mail-arrow { padding-left: 0; }
  footer { flex-wrap: wrap; }
  .foot-links { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .meter-fill { transition: none; }
}