:root {
  --ink: #0E0E0C;
  --ink-2: #1F1F1D;
  --ink-3: #4A4A46;
  --ink-4: #7A7972;
  --ink-5: #B3B1A8;
  --rule: rgba(14, 14, 12, 0.12);
  --rule-strong: rgba(14, 14, 12, 0.22);
  --paper: #F6F4EE;
  --paper-2: #EFECE3;
  --paper-3: #E7E3D7;
  --white: #FCFBF7;
  --accent: oklch(0.55 0.12 40);
  --accent-soft: oklch(0.55 0.12 40 / 0.10);
  --accent-ink: oklch(0.40 0.10 40);
  --serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans: "Geist", ui-sans-serif, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* Accent variants driven by Tweaks */
[data-accent="ink-blue"] {
  --accent: oklch(0.42 0.08 245);
  --accent-soft: oklch(0.42 0.08 245 / 0.10);
  --accent-ink: oklch(0.34 0.07 245);
}
[data-accent="deep-green"] {
  --accent: oklch(0.42 0.08 150);
  --accent-soft: oklch(0.42 0.08 150 / 0.10);
  --accent-ink: oklch(0.34 0.07 150);
}
[data-accent="clay"] {
  --accent: oklch(0.55 0.12 40);
  --accent-soft: oklch(0.55 0.12 40 / 0.10);
  --accent-ink: oklch(0.42 0.10 40);
}
[data-accent="ink-only"] {
  --accent: var(--ink);
  --accent-soft: rgba(14, 14, 12, 0.06);
  --accent-ink: var(--ink);
}

[data-surface="white"] { --paper: #FCFBF7; --paper-2: #F5F3EC; }
[data-surface="paper"] { --paper: #F6F4EE; --paper-2: #EFECE3; }
[data-surface="ink"] {
  --paper: #0E0E0C; --paper-2: #171714; --paper-3: #1F1F1D;
  --ink: #F6F4EE; --ink-2: #E7E3D7; --ink-3: #B3B1A8; --ink-4: #7A7972;
  --rule: rgba(246, 244, 238, 0.14); --rule-strong: rgba(246, 244, 238, 0.26);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  line-height: 1.55;
}
a { color: inherit; text-underline-offset: 3px; text-decoration-thickness: 1px; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input { font: inherit; color: inherit; }

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.wrap {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
}

/* ── Nav ─────────────────────────────────────────────── */
.nav {
  padding: 22px 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.005em;
}
.brand .mark {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: grid; place-items: center;
  font-family: var(--serif);
  font-size: 16px;
  font-style: italic;
  line-height: 1;
  padding-bottom: 2px;
}
.nav-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.nav-meta .dot {
  display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: oklch(0.60 0.15 140);
  margin-right: 8px;
  transform: translateY(-1px);
}

/* ── Hero ────────────────────────────────────────────── */
.hero {
  padding: 48px 0 56px;
  border-top: 1px solid var(--rule);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 72px;
  align-items: start;
}
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}
.eyebrow::before {
  content: "";
  width: 24px; height: 1px;
  background: var(--ink-4);
}

h1.headline {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 0.98;
  letter-spacing: -0.018em;
  margin: 0 0 24px;
  text-wrap: balance;
}
h1.headline em {
  font-style: italic;
  color: var(--accent);
}
.sub {
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-3);
  max-width: 44ch;
  margin: 0 0 0;
  text-wrap: pretty;
}
.sub-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  max-width: 44ch;
  border-top: 1px solid var(--rule);
}
.sub-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.sub-list li .n {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--ink-4);
  font-weight: 400;
  min-width: 24px;
}
@media (max-width: 720px) {
  .sub { font-size: 16.5px; }
}

/* ── Capture card ────────────────────────────────────── */
.capture {
  background: var(--white);
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  padding: 28px;
  box-shadow: 0 1px 0 rgba(14,14,12,0.04), 0 12px 40px -24px rgba(14,14,12,0.20);
}
[data-surface="ink"] .capture {
  background: var(--paper-2);
  border-color: var(--rule-strong);
}
.capture-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 14px;
  display: flex; justify-content: space-between; align-items: baseline;
}
.capture-label span:last-child { color: var(--ink-3); }

/* ── Tier selector ───────────────────────────────────── */
.tier-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 22px;
}
.tier {
  position: relative;
  text-align: left;
  padding: 16px 16px 14px;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  background: var(--paper);
  transition: border-color .15s ease, background .15s ease, transform .15s ease;
}
[data-surface="ink"] .tier { background: var(--paper-3); }
.tier:hover { border-color: var(--ink-3); }
.tier .tier-row { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.tier .radio {
  width: 16px; height: 16px; border-radius: 50%;
  border: 1.5px solid var(--ink-4);
  position: relative;
  flex-shrink: 0;
  transition: border-color .15s ease;
}
.tier .radio::after {
  content: "";
  position: absolute; inset: 3px;
  border-radius: 50%;
  background: var(--accent);
  transform: scale(0);
  transition: transform .18s cubic-bezier(.2,.9,.3,1.2);
}
.tier .name {
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: -0.01em;
  line-height: 1;
}
.tier .desc {
  font-size: 12.5px;
  color: var(--ink-3);
  line-height: 1.4;
  padding-left: 26px;
  font-variant-numeric: tabular-nums;
}
.tier[aria-checked="true"] {
  border-color: var(--ink);
  background: var(--white);
  box-shadow: inset 0 0 0 1px var(--ink);
}
[data-surface="ink"] .tier[aria-checked="true"] {
  background: var(--paper-2);
  box-shadow: inset 0 0 0 1px var(--ink);
}
.tier[aria-checked="true"] .radio { border-color: var(--accent); }
.tier[aria-checked="true"] .radio::after { transform: scale(1); }

/* Segmented variant */
.tier-seg {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  padding: 4px;
  margin-bottom: 22px;
  position: relative;
  background: var(--paper);
}
.tier-seg button {
  position: relative;
  padding: 11px 14px;
  border-radius: 999px;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 14px;
  color: var(--ink-3);
  z-index: 1;
  transition: color .2s ease;
}
.tier-seg button[aria-checked="true"] { color: var(--paper); }
.tier-seg .thumb {
  position: absolute;
  top: 4px; bottom: 4px; left: 4px;
  width: calc(50% - 4px);
  background: var(--ink);
  border-radius: 999px;
  transition: transform .28s cubic-bezier(.4,.1,.2,1);
}
.tier-seg .thumb[data-pos="1"] { transform: translateX(100%); }

/* ── Form fields ─────────────────────────────────────── */
.fields { display: grid; gap: 10px; margin-bottom: 14px; }
.field {
  position: relative;
  display: flex; align-items: center;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  background: var(--paper);
  transition: border-color .15s ease, background .15s ease;
}
[data-surface="ink"] .field { background: var(--paper-3); }
.field:focus-within { border-color: var(--ink); background: var(--white); }
[data-surface="ink"] .field:focus-within { background: var(--paper-2); }
.field label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-4);
  padding-left: 14px;
  flex-shrink: 0;
  width: 56px;
}
.field input {
  flex: 1;
  padding: 14px 14px 14px 10px;
  border: 0; outline: 0;
  background: transparent;
  font-size: 15.5px;
  letter-spacing: -0.005em;
}
.field input::placeholder { color: var(--ink-4); }

.cta {
  width: 100%;
  background: var(--ink);
  color: var(--paper);
  border-radius: 3px;
  padding: 15px 16px;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.005em;
  display: flex; align-items: center; justify-content: center;
  gap: 10px;
  transition: background .15s ease, transform .05s ease;
}
.cta:hover { background: var(--ink-2); }
.cta:active { transform: translateY(1px); }
.cta[disabled] { opacity: .5; cursor: not-allowed; }
.cta .arrow { transition: transform .2s ease; }
.cta:hover .arrow { transform: translateX(3px); }

.microcopy {
  font-size: 12.5px;
  color: var(--ink-4);
  line-height: 1.5;
  margin: 14px 0 0;
  text-wrap: pretty;
}
.microcopy strong { color: var(--ink-3); font-weight: 500; }

/* ── Sections ────────────────────────────────────────── */
section { padding: 72px 0; border-top: 1px solid var(--rule); }
@media (max-width: 720px) { section { padding: 56px 0; } }

.section-head {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  margin-bottom: 40px;
  align-items: start;
}
@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr; gap: 14px; margin-bottom: 28px; }
}
.section-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 10px;
}
.section-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(28px, 3.2vw, 40px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0;
  max-width: 22ch;
  text-wrap: balance;
}
.section-title em { font-style: italic; color: var(--accent); }

/* ── Mistake card ────────────────────────────────────── */
.card-frame {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 960px) {
  .card-frame { grid-template-columns: 1fr; }
}
.mcard {
  background: var(--white);
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
  display: flex; flex-direction: column;
}
[data-surface="ink"] .mcard { background: var(--paper-2); }
.mcard-head {
  padding: 22px 24px 20px;
  border-bottom: 1px solid var(--rule);
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
}
.mcard-topic {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 6px;
}
.mcard-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 26px;
  line-height: 1.05;
  letter-spacing: -0.012em;
  margin: 0;
}
.mcard-tag {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--ink-4);
  text-align: right;
  flex-shrink: 0;
  white-space: nowrap;
  line-height: 1.5;
}
.mcard-tag b { color: var(--accent); font-weight: 500; }

.mcard-part {
  padding: 20px 24px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.mcard-part:last-child { border-bottom: 0; }
.mcard-part-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 10px;
}
.mcard-part-label .n {
  width: 18px; height: 18px;
  display: grid; place-items: center;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  color: var(--ink-3);
  font-size: 10px;
  letter-spacing: 0;
}
.mcard-part.mistake .mcard-part-label .n { border-color: var(--accent); color: var(--accent); }
.mcard-part p {
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-2);
  letter-spacing: -0.003em;
}
.mcard-part.mistake p strong {
  font-weight: 500;
  color: var(--ink);
  background: var(--accent-soft);
  padding: 0 3px;
  border-radius: 1px;
}
.mcard-part.answer { background: var(--paper-2); }
[data-surface="ink"] .mcard-part.answer { background: var(--paper-3); }
.mcard-working {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 0;
  white-space: pre-wrap;
}
.mcard-working .good { color: var(--accent-ink); }
.mcard-working .bad { color: var(--ink-4); text-decoration: line-through; text-decoration-color: var(--ink-5); }

/* ── Credibility strip ──────────────────────────────── */
.cred {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  align-items: start;
}
@media (max-width: 720px) {
  .cred { grid-template-columns: 1fr; gap: 14px; }
}
.cred-body {
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.008em;
  margin: 0;
  color: var(--ink-2);
  max-width: 32ch;
}
.cred-body strong { font-style: normal; font-weight: 400; color: var(--ink); border-bottom: 1px solid var(--accent); }
.cred-meta {
  margin-top: 20px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-4);
  display: flex; flex-direction: column; gap: 4px;
}

/* ── Footer ──────────────────────────────────────────── */
footer {
  margin-top: auto;
  padding: 28px 0 36px;
  border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 20px; flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-4);
  text-transform: uppercase;
}
footer a:hover { color: var(--ink-2); }

/* ── Success state ───────────────────────────────────── */
.success-wrap {
  min-height: calc(100vh - 80px);
  display: grid;
  place-items: center;
  padding: 80px 0;
}
.success {
  max-width: 620px;
  text-align: left;
  animation: rise .6s cubic-bezier(.2,.8,.2,1) both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.success .stamp {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
.success .stamp::before {
  content: "";
  width: 32px; height: 1px;
  background: var(--accent);
}
.success h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.02;
  letter-spacing: -0.018em;
  margin: 0 0 20px;
  text-wrap: balance;
}
.success h2 em { color: var(--accent); font-style: italic; }
.success p { color: var(--ink-3); font-size: 17px; line-height: 1.55; max-width: 52ch; margin: 0 0 32px; }

.download {
  display: inline-flex; align-items: center; gap: 14px;
  background: var(--ink);
  color: var(--paper);
  padding: 18px 22px;
  border-radius: 3px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
}
.download:hover { background: var(--ink-2); }
.download .filesize {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-5);
  padding-left: 14px;
  border-left: 1px solid rgba(246,244,238,0.2);
  letter-spacing: 0.08em;
}

.success-note {
  margin-top: 40px;
  padding: 20px 22px;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  background: var(--paper-2);
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.5;
  display: flex; gap: 14px; align-items: flex-start;
}
.success-note .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  margin-top: 7px; flex-shrink: 0;
}
.success-note strong { font-weight: 500; }

/* Upsell card on success view */
.upsell {
  margin-top: 28px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  overflow: hidden;
  background: var(--white);
}
[data-surface="ink"] .upsell { background: var(--paper-2); }
.upsell-inner {
  padding: 28px 28px 26px;
  position: relative;
}
.upsell-inner::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--accent);
}
.upsell-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.upsell-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.05;
  letter-spacing: -0.014em;
  margin: 0 0 12px;
  color: var(--ink);
}
.upsell-body {
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--ink-3);
  max-width: 56ch;
  text-wrap: pretty;
}
.upsell-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  padding: 14px 18px;
  border-radius: 3px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: background .15s ease, transform .05s ease;
}
.upsell-cta:hover { background: var(--ink-2); }
.upsell-cta:active { transform: translateY(1px); }
.upsell-cta .arrow { transition: transform .2s ease; }
.upsell-cta:hover .arrow { transform: translateX(3px); }
.upsell-meta {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-4);
}

/* Referral row on success view */
.referral {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px dashed var(--rule);
}
.referral-kicker {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 14px;
}
.referral-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.referral-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--ink);
  color: var(--ink);
  padding: 10px 14px;
  border-radius: 3px;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s ease, color .15s ease;
}
.referral-btn:hover { background: var(--ink); color: var(--paper); }
.referral-btn.alt {
  border-color: var(--rule);
  color: var(--ink-3);
}
.referral-btn.alt:hover { background: var(--paper-2); color: var(--ink); border-color: var(--ink); }

/* Submit error message */
.submit-error {
  margin: 10px 0 0;
  padding: 10px 12px;
  border: 1px solid #c96044;
  background: rgba(201, 96, 68, 0.06);
  color: #8a3a23;
  font-size: 13.5px;
  border-radius: 3px;
  line-height: 1.4;
}

/* ── Tweaks panel ────────────────────────────────────── */
.tweaks {
  position: fixed;
  bottom: 20px; right: 20px;
  width: 300px;
  background: var(--white);
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  box-shadow: 0 20px 60px -20px rgba(14,14,12,0.30);
  padding: 18px;
  z-index: 100;
  font-family: var(--sans);
  font-size: 13px;
}
[data-surface="ink"] .tweaks { background: var(--paper-2); color: var(--ink); }
.tweaks-title {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 16px;
  display: flex; justify-content: space-between;
}
.tweak-row { margin-bottom: 14px; }
.tweak-row:last-child { margin-bottom: 0; }
.tweak-row > .k {
  font-size: 11px; color: var(--ink-4);
  font-family: var(--mono); letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.swatches { display: flex; gap: 8px; }
.swatches button {
  width: 28px; height: 28px; border-radius: 50%;
  border: 1px solid var(--rule-strong);
  cursor: pointer;
  position: relative;
}
.swatches button.on { outline: 2px solid var(--ink); outline-offset: 2px; }
.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 4px; padding: 3px; background: var(--paper-2); border-radius: 3px; }
.seg button {
  padding: 8px 8px; font-size: 12px; border-radius: 2px;
  color: var(--ink-3);
}
.seg button.on { background: var(--white); color: var(--ink); box-shadow: 0 1px 0 var(--rule-strong); }
[data-surface="ink"] .seg { background: var(--paper-3); }
[data-surface="ink"] .seg button.on { background: var(--paper-2); }

/* ── Motion ─────────────────────────────────────────── */
.fade-in { animation: fadeIn .35s ease both; }
@keyframes fadeIn { from { opacity: 0.001; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

/* Book button in nav */
.nav-book {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  padding: 9px 14px;
  border-radius: 3px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: background .15s ease, transform .05s ease;
}
.nav-book:hover { background: var(--ink-2); }
.nav-book:active { transform: translateY(1px); }
.nav-book .arrow { transition: transform .2s ease; }
.nav-book:hover .arrow { transform: translateX(2px); }
[data-surface="ink"] .nav-book { background: var(--paper); color: var(--ink); }
[data-surface="ink"] .nav-book:hover { background: var(--paper-2); }

@media (max-width: 540px) {
  .nav-book { padding: 8px 11px; font-size: 12.5px; }
  .nav-book span:first-child { display: inline; }
}
.mark-logo {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--ink);
  display: grid; place-items: center;
  overflow: hidden;
}
.mark-logo img, .mark-logo svg {
  display: block;
  filter: invert(1);
}
[data-surface="ink"] .mark-logo { background: var(--paper); }
[data-surface="ink"] .mark-logo img, [data-surface="ink"] .mark-logo svg { filter: none; }

/* Legal / privacy page */
.legal {
  padding: 40px 32px 80px;
  max-width: 680px;
  margin: 0 auto;
}
.legal-h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(48px, 7vw, 80px);
  line-height: 0.96;
  letter-spacing: -0.018em;
  margin: 12px 0 24px;
}
.legal .lede {
  font-family: var(--serif);
  font-size: clamp(20px, 2.4vw, 26px);
  font-style: italic;
  line-height: 1.35;
  color: var(--ink-2);
  letter-spacing: -0.008em;
  margin: 0 0 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--rule);
  text-wrap: pretty;
}
.legal h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.012em;
  margin: 36px 0 12px;
}
.legal p, .legal ul, .legal li {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
  letter-spacing: -0.003em;
  margin: 0 0 14px;
}
.legal ul { padding-left: 22px; }
.legal li { margin-bottom: 6px; }
.legal a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.legal-foot {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-4);
  text-transform: uppercase;
}
.manifesto-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule);
}
.manifesto-list li {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}
@media (max-width: 720px) {
  .manifesto-list li { grid-template-columns: 1fr; gap: 12px; padding: 24px 0; }
}
.mf-kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-4);
  padding-top: 10px;
}
.mf-body { max-width: 58ch; }
.mf-body h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(24px, 2.6vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.012em;
  margin: 0 0 10px;
  text-wrap: balance;
  color: var(--ink);
}
.mf-body p {
  margin: 0;
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink-3);
  text-wrap: pretty;
  letter-spacing: -0.003em;
}
.spec {
  margin-top: 32px;
  padding-top: 22px;
  border-top: 1px solid var(--rule);
  max-width: 46ch;
}
.spec-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 8px;
}
.spec-title {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.spec-cols {
  display: inline-flex; gap: 18px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.spec-cols .on { color: var(--accent); }
.spec-cols .off { opacity: 0.3; }
.spec-rows { list-style: none; margin: 0; padding: 0; }
.spec-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
}
.spec-topic {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--ink);
}
.spec-vals {
  display: grid;
  grid-template-columns: 72px 72px;
  gap: 18px;
  align-items: center;
}
.spec-val {
  display: flex; align-items: center; gap: 8px;
  justify-content: flex-end;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
  transition: opacity .2s ease;
}
.spec-val.dim { opacity: 0.28; }
.spec-val b { font-weight: 500; font-variant-numeric: tabular-nums; min-width: 32px; text-align: right; }
.spec-bar {
  flex: 1;
  height: 6px;
  background: var(--paper-3);
  position: relative;
  border-radius: 1px;
  overflow: hidden;
}
.spec-bar::after {
  content: "";
  position: absolute; inset: 0;
  width: var(--w);
  background: var(--ink);
  transition: width .3s cubic-bezier(.2,.8,.2,1);
}
.spec-val.f .spec-bar::after { background: var(--accent); }
.spec[data-tier="higher"] .spec-val.h .spec-bar::after,
.spec[data-tier="foundation"] .spec-val.f .spec-bar::after { background: var(--accent); }
.spec-foot {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ink-4);
  text-transform: uppercase;
}
@media (max-width: 480px) {
  .spec-vals { grid-template-columns: 60px 60px; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}