:root {
  --cream: #fbf8f3;
  --paper: #fffdf9;
  --graphite: #30383f;
  --graphite-soft: #4f5960;
  --gold: #d5a43a;
  --gold-dark: #9b6c16;
  --teal: #0b9094;
  --teal-dark: #086d70;
  --line: #ddd5c8;
  --ink-on-dark: #f7f1e7;
  --max: 1180px;
  --shadow: 0 18px 50px rgba(48, 56, 63, 0.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--graphite);
  background: var(--cream);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
.shell { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.skip-link { position: fixed; left: 18px; top: -100px; z-index: 50; padding: 10px 14px; background: var(--graphite); color: white; }
.skip-link:focus { top: 12px; }

.site-header { position: relative; z-index: 10; background: rgba(251, 248, 243, 0.96); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 760; letter-spacing: -0.02em; }
.brand img { border-radius: 50%; }
nav { display: flex; gap: 8px; }
nav a { padding: 9px 12px; color: var(--graphite-soft); text-decoration: none; font-size: 0.92rem; font-weight: 680; }
nav a:hover, nav a:focus-visible { color: var(--teal-dark); }
.preview-strip { background: #f4ead6; border-bottom: 1px solid #d8c49c; }
.preview-strip-inner { min-height: 52px; display: flex; align-items: center; gap: 14px; padding-block: 8px; }
.preview-strip p { margin: 0; color: var(--graphite-soft); font-size: 0.86rem; }
.preview-strip a { color: var(--gold-dark); font-weight: 800; text-underline-offset: 3px; }

.hero { border-bottom: 1px solid var(--line); overflow: hidden; }
.hero-grid { min-height: 680px; display: grid; grid-template-columns: minmax(0, 1.22fr) minmax(320px, 0.78fr); align-items: center; gap: 64px; padding-block: 88px; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin: 0 0 18px; color: var(--teal-dark); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; }
.eyebrow span { width: 30px; height: 2px; background: var(--gold); }
.eyebrow.light { color: #8fd4d0; }
h1, h2, h3 { margin-top: 0; color: var(--graphite); font-family: Georgia, "Times New Roman", serif; line-height: 1.08; }
h1 { max-width: 780px; margin-bottom: 24px; font-size: clamp(3.4rem, 7vw, 6.8rem); letter-spacing: -0.055em; }
.lede { max-width: 720px; margin: 0; color: var(--graphite-soft); font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.1rem, 2vw, 1.42rem); line-height: 1.65; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 11px 18px; border: 1px solid transparent; text-decoration: none; font-size: 0.91rem; font-weight: 780; }
.button-primary { background: var(--graphite); color: white; }
.button-primary:hover, .button-primary:focus-visible { background: var(--teal-dark); }
.button-secondary { border-color: var(--line); background: transparent; color: var(--graphite); }
.button-secondary:hover, .button-secondary:focus-visible { border-color: var(--teal); color: var(--teal-dark); }
.button-action { background: var(--teal-dark); color: white; }
.button-action:hover, .button-action:focus-visible { background: #075b5e; }
.button-soft { border-color: #b8d4d2; background: #eef7f6; color: var(--teal-dark); }
.button-soft:hover, .button-soft:focus-visible { border-color: var(--teal); background: #dcefee; }
.button-compact { min-height: 40px; padding: 8px 10px; font-size: 0.78rem; }
.trust-list { display: flex; flex-wrap: wrap; gap: 10px 24px; margin: 38px 0 0; padding: 22px 0 0; border-top: 1px solid var(--line); list-style: none; color: var(--graphite-soft); font-size: 0.84rem; font-weight: 700; }
.trust-list li::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 9px; border-radius: 50%; background: var(--teal); }

.hero-mark { width: min(100%, 390px); justify-self: end; }
.hero-logo { width: 100%; height: auto; }

.section { padding-block: 100px; }
.section-heading { max-width: 760px; margin-bottom: 46px; }
.section-heading.narrow { max-width: 650px; }
.section-heading h2, .permanence-grid h2, .page-hero h1 { margin-bottom: 18px; font-size: clamp(2.4rem, 5vw, 4.5rem); letter-spacing: -0.045em; }
.section-heading > p:last-child { color: var(--graphite-soft); font-size: 1.05rem; }
.tool-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.tool-card { position: relative; min-height: 570px; display: flex; flex-direction: column; padding: 40px; background: var(--paper); border: 1px solid var(--line); box-shadow: var(--shadow); }
.tool-card::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 5px; background: var(--teal); }
.pay-card::before { background: var(--gold); }
.card-topline { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 54px; }
.tool-number { font-family: Georgia, "Times New Roman", serif; font-size: 1.05rem; font-weight: 700; }
.status { padding: 6px 10px; border: 1px solid currentColor; font-size: 0.7rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.status-offline { color: var(--teal-dark); }
.status-network { color: var(--gold-dark); }
.status-preview { flex: 0 0 auto; color: var(--gold-dark); background: #fff8e8; }
.tool-card h3 { margin-bottom: 8px; font-size: clamp(2rem, 4vw, 3.1rem); letter-spacing: -0.04em; }
.tool-tagline { margin: 0 0 24px; color: var(--teal-dark); font-weight: 760; }
.pay-card .tool-tagline { color: var(--gold-dark); }
.tool-card > p:not(.tool-tagline) { color: var(--graphite-soft); }
.feature-list { display: grid; gap: 8px; margin: 20px 0 36px; padding: 0; list-style: none; font-size: 0.9rem; font-weight: 680; }
.feature-list li { padding: 8px 0; border-bottom: 1px solid var(--line); }
.feature-list li::before { content: "+"; margin-right: 10px; color: var(--teal); font-weight: 900; }
.pay-card .feature-list li::before { color: var(--gold-dark); }
.edition-choice { margin: 0 0 18px; padding: 14px 16px; border-left: 4px solid var(--gold); background: #f7eedc; color: var(--graphite-soft); font-size: 0.84rem; }
.edition-choice a { color: var(--gold-dark); font-weight: 800; }
.edition-options { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: auto; }
.edition-option { display: flex; flex-direction: column; padding: 18px; border: 1px solid var(--line); background: #fffcf6; }
.edition-option h4 { margin-bottom: 8px; font-size: 1rem; }
.edition-option h4 small { display: block; margin-top: 5px; color: var(--graphite-soft); font-size: 0.7rem; line-height: 1.35; }
.edition-option p { margin: 0 0 16px; color: var(--graphite-soft); font-size: 0.82rem; line-height: 1.55; }
.edition-links { display: grid; gap: 8px; margin-top: auto; }
.edition-links .button { width: 100%; }
.edition-links a:first-child::after { content: " →"; }
.qr-option { border-color: #d6c08f; background: #f8efdc; }
.expanded-option { border-color: #b8d4d2; background: #eef7f6; }
.card-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: auto; }
.card-note { margin: 14px 0 0; color: var(--graphite-soft); font-size: 0.78rem; }
.text-link { color: var(--teal-dark); text-underline-offset: 4px; font-size: 0.9rem; font-weight: 800; }
.text-link:hover, .text-link:focus-visible { color: var(--gold-dark); }

.principles-section { background: var(--graphite); color: var(--ink-on-dark); }
.principles-section h2, .principles-section h3 { color: var(--ink-on-dark); }
.principle-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid #657078; }
.principle-grid article { min-height: 260px; padding: 34px 30px 20px 0; border-right: 1px solid #657078; }
.principle-grid article + article { padding-left: 30px; }
.principle-grid article:last-child { border-right: 0; }
.principle-index { color: var(--gold); font-family: Georgia, "Times New Roman", serif; font-size: 1.1rem; }
.principle-grid h3 { margin: 52px 0 12px; font-size: 1.7rem; }
.principle-grid p { margin: 0; color: #cad0d2; }

.permanence-grid { display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); gap: 90px; align-items: start; }
.permanence-copy { padding-top: 46px; color: var(--graphite-soft); font-size: 1.06rem; }
.permanence-copy p { margin-top: 0; }
.verification-section { background: #f2ede4; }
.verification-wrap { max-width: 100%; overflow-x: auto; outline-offset: 5px; }
.verification-table { min-width: 980px; background: var(--paper); }
.verification-table th[scope="row"] { min-width: 250px; text-align: left; }
.verification-table th small { display: block; margin-top: 6px; color: var(--graphite-soft); font-weight: 500; letter-spacing: 0; text-transform: none; }
.verification-table td:nth-child(2) { white-space: nowrap; }
.file-hash code, .txid-value code { display: block; min-width: 460px; overflow-wrap: anywhere; white-space: normal; font-size: 0.72rem; }
.pending-value { color: var(--gold-dark); font-size: 0.78rem; font-weight: 800; white-space: nowrap; }
.safety-note { background: #efe6d4; border-block: 1px solid #d8c6a4; }
.safety-inner { display: grid; grid-template-columns: 220px 1fr; gap: 30px; padding-block: 30px; }
.safety-inner strong { color: var(--gold-dark); }
.safety-inner p { margin: 0; }

.page-hero { border-bottom: 1px solid var(--line); }
.page-hero-inner { padding-block: 100px 84px; }
.page-hero h1 { max-width: 920px; font-size: clamp(3rem, 6vw, 5.8rem); }
.page-hero .lede { max-width: 800px; }
.article-grid { display: grid; grid-template-columns: 230px minmax(0, 760px); justify-content: space-between; gap: 70px; }
.article-index { position: sticky; top: 36px; align-self: start; display: grid; gap: 8px; padding: 22px; border: 1px solid var(--line); background: var(--paper); }
.article-index p { margin: 0 0 8px; color: var(--graphite); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.article-index a { color: var(--graphite-soft); text-decoration: none; font-size: 0.9rem; }
.article-index a:hover, .article-index a:focus-visible { color: var(--teal-dark); text-decoration: underline; }
.prose > section { padding-bottom: 78px; scroll-margin-top: 24px; }
.prose > section + section { padding-top: 10px; border-top: 1px solid var(--line); }
.section-kicker { color: var(--teal-dark); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.prose h2 { margin-bottom: 22px; font-size: clamp(2.15rem, 4vw, 3.35rem); letter-spacing: -0.035em; }
.prose p { color: var(--graphite-soft); font-family: Georgia, "Times New Roman", serif; font-size: 1.06rem; line-height: 1.82; }
.artifact-list { margin-top: 30px; border-top: 1px solid var(--line); }
.artifact-list > div { display: grid; grid-template-columns: 1.1fr 2fr auto auto; gap: 18px; align-items: center; padding: 20px 0; border-bottom: 1px solid var(--line); }
.artifact-list span { color: var(--graphite-soft); font-size: 0.9rem; }
.artifact-list a { color: var(--teal-dark); font-size: 0.82rem; font-weight: 800; }
.callout { margin: 28px 0; padding: 24px; border-left: 4px solid var(--gold); background: #f2eadb; }
.callout strong { color: var(--gold-dark); }
.callout p { margin: 8px 0 0; font-size: 0.98rem; }
table { width: 100%; margin-top: 30px; border-collapse: collapse; font-size: 0.9rem; }
th, td { padding: 14px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--graphite); font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; }
code { padding: 2px 6px; background: #eee8dd; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 0.86em; }
.version-note { margin-block: 26px !important; padding-top: 20px; border-top: 1px solid var(--line); font-size: 0.9rem !important; }
.choice-hero .page-hero-inner, .status-hero .page-hero-inner { padding-bottom: 72px; }
.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.choice-card { display: flex; flex-direction: column; padding: 38px; border: 1px solid var(--line); background: var(--paper); box-shadow: var(--shadow); }
.choice-card h2 { margin: 0 0 18px; font-size: clamp(2.15rem, 4vw, 3.35rem); letter-spacing: -0.035em; }
.choice-card h3 { margin: 24px 0 8px; font-size: 1rem; }
.choice-card > p:not(.section-kicker) { color: var(--graphite-soft); }
.choice-card .feature-list { margin-bottom: 30px; }
.choice-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-top: auto; }
.choice-note { margin-top: 28px; }
.choice-footer { margin: 28px 0 0; color: var(--graphite-soft); text-align: center; }
.choice-footer a { color: var(--teal-dark); font-weight: 800; }
.status-list { display: grid; gap: 10px; padding-left: 22px; color: var(--graphite-soft); font-family: Georgia, "Times New Roman", serif; font-size: 1.02rem; line-height: 1.7; }
.status-list li::marker { color: var(--teal-dark); font-weight: 800; }
.open-list li::marker { color: var(--gold-dark); }

.site-footer { padding-block: 50px; background: #252c31; color: #cbd1d3; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr); gap: 60px; }
.footer-brand { color: white; }
.site-footer p { max-width: 540px; margin: 14px 0 0; font-size: 0.84rem; }
.footer-meta { padding-top: 4px; text-align: right; }
.footer-meta p { margin-left: auto; }

a:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

@media (max-width: 900px) {
  .hero-grid { min-height: auto; grid-template-columns: 1fr; padding-block: 72px; }
  .hero-mark { width: min(72vw, 390px); justify-self: center; order: -1; }
  .tool-grid, .permanence-grid, .article-grid, .edition-options, .choice-grid { grid-template-columns: 1fr; }
  .article-index { position: static; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article, .principle-grid article + article { min-height: 0; padding: 28px 0; border-right: 0; border-bottom: 1px solid #657078; }
  .principle-grid article:last-child { border-bottom: 0; }
  .principle-grid h3 { margin-top: 22px; }
  .permanence-copy { padding-top: 0; }
}

@media (max-width: 650px) {
  .shell { width: min(calc(100% - 28px), var(--max)); }
  .header-inner { min-height: 68px; }
  .brand img { width: 40px; height: 40px; }
  .site-header nav a { padding-inline: 7px; font-size: 0.84rem; }
  .preview-strip-inner { align-items: flex-start; flex-direction: column; gap: 6px; padding-block: 12px; }
  .hero-grid { gap: 40px; padding-block: 54px; }
  .hero-mark { width: min(78vw, 300px); }
  h1 { font-size: clamp(3rem, 15vw, 4.5rem); }
  .section { padding-block: 72px; }
  .tool-card { min-height: 0; padding: 28px 24px; }
  .card-topline { margin-bottom: 38px; }
  .edition-options { grid-template-columns: 1fr; }
  .choice-card { padding: 28px 24px; }
  .card-actions { align-items: stretch; flex-direction: column; }
  .card-actions .button { width: 100%; }
  .safety-inner, .footer-grid { grid-template-columns: 1fr; gap: 14px; }
  .footer-meta { text-align: left; }
  .footer-meta p { margin-left: 0; }
  .artifact-list > div { grid-template-columns: 1fr 1fr; }
  .artifact-list span { grid-column: 1 / -1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}