:root {
  --stone-50: #F6F4F0;
  --stone-100: #EEEBE5;
  --stone-200: #DEDAD2;
  --stone-300: #C9C4B9;
  --ink: #1C1E21;
  --ink-2: #2A2D31;
  --ink-3: #3A3E44;
  --muted: #5B5850;
  --muted-dark: #B7B2A7;
  --amber: #E2A33E;
  --amber-soft: #F3DDB4;
  --amber-ink: #85570A;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Source Sans 3", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --wrap: 1200px;
  --gutter: clamp(20px, 4vw, 48px);
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--stone-50);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--amber-ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--ink); }

:focus-visible { outline: 2px solid var(--amber-ink); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 400; letter-spacing: -0.01em; margin: 0; color: var(--ink); }

p { margin: 0 0 1em; }

.skip {
  position: absolute; left: 16px; top: -60px; z-index: 50;
  background: var(--ink); color: var(--stone-50); padding: 10px 16px; border-radius: 4px; text-decoration: none;
}
.skip:focus { top: 12px; color: var(--stone-50); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }

.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand svg { width: 30px; height: 30px; flex: none; }
.brand-name { font-family: var(--serif); font-size: 22px; letter-spacing: -0.01em; line-height: 1; }
.brand-name span { font-family: var(--sans); font-size: 12px; font-weight: 600; letter-spacing: 0.16em; margin-left: 6px; color: var(--muted); vertical-align: 3px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font: 500 15px/1 var(--sans); padding: 14px 20px; border-radius: 4px;
  text-decoration: none; border: 1px solid transparent; cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}
.btn svg { width: 16px; height: 16px; }
.btn-dark { background: var(--ink); color: var(--stone-50); }
.btn-dark:hover { background: var(--ink-3); color: var(--stone-50); }
.btn-line { border-color: var(--stone-300); color: var(--ink); background: transparent; }
.btn-line:hover { border-color: var(--ink); color: var(--ink); }
.btn-amber { background: var(--amber); color: var(--ink); }
.btn-amber:hover { background: #EDB65A; color: var(--ink); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font: 600 12px/1.2 var(--sans); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted);
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--amber); }

.site-header { border-bottom: 1px solid var(--stone-200); background: var(--stone-50); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 76px; }
.site-nav { display: flex; align-items: center; gap: 28px; }
.site-nav ul { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
.site-nav ul a { color: var(--ink-3); text-decoration: none; font-size: 15px; }
.site-nav ul a:hover { color: var(--ink); text-decoration: underline; }
.site-nav .btn { padding: 11px 16px; font-size: 14px; }

.hero { padding: clamp(48px, 8vw, 104px) 0 clamp(56px, 8vw, 96px); border-bottom: 1px solid var(--stone-200); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(40px, 6vw, 88px); align-items: end; }
.hero h1 { font-size: clamp(42px, 6.2vw, 80px); line-height: 1.02; letter-spacing: -0.02em; margin: 22px 0 28px; max-width: 12ch; }
.hero h1 em { font-style: italic; color: var(--ink-3); }
.hero-lede { font-size: clamp(18px, 1.6vw, 20px); color: var(--ink-3); max-width: 34em; margin-bottom: 36px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.record-wrap { margin: 0; }
.record { background: #FFFFFF; border: 1px solid var(--stone-200); border-radius: 6px; box-shadow: 0 1px 0 var(--stone-200), 0 24px 48px -32px rgba(28, 30, 33, .35); }
.record-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--stone-200); }
.record-head p { margin: 0; font: 600 12px/1.2 var(--sans); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.tag { display: inline-flex; align-items: center; gap: 7px; font: 500 13px/1 var(--sans); padding: 6px 10px; border-radius: 99px; background: var(--amber-soft); color: #5E3E06; }
.tag::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--amber-ink); }
.record dl { margin: 0; padding: 6px 20px; display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: 0; }
.record dt, .record dd { padding: 11px 0; border-bottom: 1px dashed var(--stone-200); margin: 0; font-size: 14px; }
.record dt { color: var(--muted); }
.record dd { font-family: var(--mono); font-size: 13.5px; text-align: right; padding-left: 20px; overflow-wrap: anywhere; }
.record dl > :nth-last-child(-n+2) { border-bottom: 0; }
.trail { list-style: none; margin: 0; padding: 18px 20px 20px; border-top: 1px solid var(--stone-200); background: var(--stone-50); border-radius: 0 0 6px 6px; }
.trail li { position: relative; display: grid; grid-template-columns: 18px minmax(0, 1fr) auto; gap: 12px; align-items: baseline; padding: 6px 0; font-size: 14px; }
.trail li::before { content: ""; width: 9px; height: 9px; border-radius: 50%; border: 2px solid var(--ink-3); background: var(--stone-50); transform: translateY(1px); }
.trail li.done::before { background: var(--ink-3); }
.trail li.final::before { background: var(--amber); border-color: var(--amber-ink); }
.trail time { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.record-note { margin: 12px 0 0; font-size: 13px; color: var(--muted); }

.section { padding: clamp(64px, 9vw, 120px) 0; border-bottom: 1px solid var(--stone-200); }
.section-grid { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: clamp(32px, 5vw, 72px); }
.section-label { position: sticky; top: 28px; align-self: start; }
.section-label .num { display: block; font-family: var(--serif); font-size: 44px; line-height: 1; color: var(--amber-ink); margin-bottom: 10px; }
.section-label .name { font: 600 12px/1.4 var(--sans); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.section h2 { font-size: clamp(32px, 4vw, 50px); line-height: 1.08; letter-spacing: -0.015em; max-width: 18ch; margin-bottom: 20px; }
.section .intro { font-size: 19px; color: var(--ink-3); max-width: 38em; margin-bottom: 48px; }

.ledger { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.ledger li { display: grid; grid-template-columns: 44px minmax(0, 5fr) minmax(0, 7fr); gap: 24px; padding: 26px 0; border-bottom: 1px solid var(--stone-200); align-items: start; }
.ledger svg { width: 26px; height: 26px; color: var(--ink-3); margin-top: 3px; }
.ledger h3 { font-size: 24px; line-height: 1.25; }
.ledger p { margin: 0; color: var(--ink-3); }

.principles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--ink); }
.principles article { padding: 32px 32px 32px 0; border-bottom: 1px solid var(--stone-200); }
.principles article:nth-child(even) { padding: 32px 0 32px 32px; border-left: 1px solid var(--stone-200); }
.principles h3 { font-size: 24px; line-height: 1.25; margin-bottom: 12px; }
.principles p { margin: 0; color: var(--ink-3); }
.principles .k { display: block; font: 600 12px/1 var(--sans); letter-spacing: 0.16em; text-transform: uppercase; color: var(--amber-ink); margin-bottom: 16px; }

.dark { background: var(--ink); color: var(--stone-100); border-bottom-color: var(--ink); }
.dark h2, .dark h3 { color: var(--stone-50); }
.dark .intro, .dark p { color: var(--muted-dark); }
.dark .section-label .num { color: var(--amber); }
.dark .section-label .name { color: var(--muted-dark); }
.dark a { color: var(--amber); }
.dark a:hover { color: var(--stone-50); }
.dark :focus-visible { outline-color: var(--amber); }

.api-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 6fr); gap: clamp(32px, 4vw, 56px); align-items: start; }
.steps { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.steps li { counter-increment: s; position: relative; padding: 0 0 26px 48px; }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 0;
  width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--ink-3);
  display: grid; place-items: center; font: 500 14px/1 var(--sans); color: var(--amber);
}
.steps li::after { content: ""; position: absolute; left: 15px; top: 36px; bottom: 6px; width: 1px; background: var(--ink-3); }
.steps li:last-child::after { display: none; }
.steps h3 { font-family: var(--sans); font-size: 17px; font-weight: 600; margin: 3px 0 6px; letter-spacing: 0; }
.steps p { margin: 0; font-size: 16px; }

.code { background: #121315; border: 1px solid var(--ink-3); border-radius: 6px; overflow: hidden; }
.code-bar { display: flex; justify-content: space-between; align-items: center; padding: 12px 18px; border-bottom: 1px solid var(--ink-2); font: 500 13px/1 var(--sans); color: var(--muted-dark); }
.code-bar b { font-weight: 600; color: var(--amber); letter-spacing: 0.08em; }
.code pre { margin: 0; padding: 22px 18px 24px; overflow-x: auto; font: 14px/1.75 var(--mono); color: #E7E3DA; tab-size: 2; }
.code .c-k { color: var(--amber); }
.code .c-s { color: #CFC8B5; }
.code .c-f { color: #9FB6C9; }
.code-foot { margin: 16px 0 0; font-size: 15px; }
code.inline { font-family: var(--mono); font-size: 0.88em; background: var(--stone-100); padding: 2px 6px; border-radius: 3px; }
.dark code.inline { background: var(--ink-2); color: var(--stone-100); }

.lifecycle { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--stone-300); border-radius: 6px; overflow: hidden; background: #FFFFFF; margin-bottom: 40px; }
.lifecycle div { padding: 22px 20px 24px; border-right: 1px solid var(--stone-200); position: relative; }
.lifecycle div:last-child { border-right: 0; }
.lifecycle .st { display: inline-flex; align-items: center; gap: 8px; font: 500 13px/1 var(--mono); padding: 6px 9px; border-radius: 3px; background: var(--stone-100); color: var(--ink); margin-bottom: 14px; }
.lifecycle .ok .st { background: var(--amber-soft); color: #5E3E06; }
.lifecycle p { margin: 0; font-size: 15px; color: var(--ink-3); }
.lifecycle .step { display: block; font: 600 11px/1 var(--sans); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }

.two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(28px, 4vw, 56px); }
.two h3 { font-size: 24px; margin-bottom: 10px; }
.two p { color: var(--ink-3); }

.credit { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: clamp(32px, 5vw, 72px); align-items: start; }
.balance { border: 1px solid var(--stone-300); border-radius: 6px; background: #FFFFFF; padding: 26px; }
.balance h3 { font-family: var(--sans); font-size: 13px; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 18px; }
.balance ol { list-style: none; margin: 0; padding: 0; }
.balance li { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 14px; padding: 14px 0; border-top: 1px solid var(--stone-200); }
.balance li:first-child { border-top: 0; padding-top: 0; }
.balance svg { width: 22px; height: 22px; color: var(--amber-ink); margin-top: 3px; }
.balance strong { display: block; font-weight: 600; }
.balance span { color: var(--ink-3); font-size: 15px; }

.plain-list { list-style: none; margin: 0 0 28px; padding: 0; }
.plain-list li { position: relative; padding: 10px 0 10px 28px; border-bottom: 1px solid var(--stone-200); color: var(--ink-3); }
.plain-list li::before { content: ""; position: absolute; left: 0; top: 21px; width: 14px; height: 2px; background: var(--amber); }

.terms { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.terms > div { padding: 30px 32px 30px 0; }
.terms > div + div { padding: 30px 0 30px 32px; border-left: 1px solid var(--stone-200); }
.terms .k { display: block; font: 600 12px/1 var(--sans); letter-spacing: 0.16em; text-transform: uppercase; color: var(--amber-ink); margin-bottom: 14px; }
.terms h3 { font-size: clamp(26px, 3vw, 34px); line-height: 1.15; margin-bottom: 12px; }
.terms p { margin: 0; color: var(--ink-3); }

.faq { border-top: 1px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--stone-200); }
.faq summary {
  list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px;
  padding: 22px 0; font-family: var(--serif); font-size: 22px; line-height: 1.3;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary svg { width: 20px; height: 20px; flex: none; color: var(--amber-ink); transition: transform .2s ease; }
.faq details[open] summary svg { transform: rotate(45deg); }
.faq details p { margin: 0; padding: 0 0 24px; max-width: 44em; color: var(--ink-3); }

.closing { background: var(--stone-100); padding: clamp(64px, 9vw, 112px) 0; border-bottom: 1px solid var(--stone-200); }
.closing .wrap { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 40px; align-items: end; }
.closing h2 { font-size: clamp(34px, 4.6vw, 58px); line-height: 1.05; letter-spacing: -0.015em; max-width: 14ch; }
.closing p { color: var(--ink-3); margin-bottom: 24px; }
.closing .hero-actions { justify-content: flex-start; }

.site-footer { background: var(--ink); color: var(--muted-dark); padding: 48px 0 40px; font-size: 15px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px; }
.site-footer .brand { color: var(--stone-50); }
.site-footer .brand-name span { color: var(--muted-dark); }
.site-footer ul { display: flex; flex-wrap: wrap; gap: 24px; list-style: none; margin: 0; padding: 0; }
.site-footer a { color: var(--stone-100); text-decoration: none; }
.site-footer a:hover { color: var(--amber); text-decoration: underline; }
.site-footer :focus-visible { outline-color: var(--amber); }
.site-footer small { font-size: 14px; }

@media (max-width: 1040px) {
  .site-nav ul { display: none; }
  .hero-grid, .api-grid, .credit, .closing .wrap { grid-template-columns: minmax(0, 1fr); }
  .hero-grid { align-items: start; }
  .section-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .section-label { position: static; display: flex; align-items: baseline; gap: 14px; }
  .section-label .num { font-size: 32px; margin: 0; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .ledger li { grid-template-columns: 32px minmax(0, 1fr); gap: 8px 16px; }
  .ledger li p { grid-column: 2; }
  .principles, .terms, .two { grid-template-columns: minmax(0, 1fr); }
  .principles article, .principles article:nth-child(even) { padding: 26px 0; border-left: 0; }
  .terms > div, .terms > div + div { padding: 26px 0; border-left: 0; }
  .terms > div + div { border-top: 1px solid var(--stone-200); }
  .lifecycle { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lifecycle div:nth-child(2) { border-right: 0; }
  .lifecycle div:nth-child(-n+2) { border-bottom: 1px solid var(--stone-200); }
  .faq summary { font-size: 19px; }
  .section .intro { font-size: 17px; margin-bottom: 36px; }
}

@media (max-width: 420px) {
  .lifecycle { grid-template-columns: minmax(0, 1fr); }
  .lifecycle div { border-right: 0; border-bottom: 1px solid var(--stone-200); }
  .lifecycle div:last-child { border-bottom: 0; }
  .hero-actions .btn { flex: 1 1 100%; }
  .code pre { font-size: 12px; padding: 18px 14px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

.auth-page { background: var(--stone-100); }
.auth { min-height: 100vh; display: flex; flex-direction: column; align-items: center; padding: 40px var(--gutter) 32px; gap: 32px; }
.auth-top { display: flex; justify-content: center; }
.auth-main { flex: 1; width: 100%; display: flex; align-items: center; justify-content: center; }
.auth-main:focus { outline: none; }
.auth-card { width: 100%; max-width: 440px; background: #FFFFFF; border: 1px solid var(--stone-200); border-top: 3px solid var(--amber); border-radius: 6px; padding: clamp(28px, 5vw, 44px); box-shadow: 0 24px 48px -32px rgba(28, 30, 33, .35); }
.auth-card h1 { font-size: clamp(36px, 4vw, 44px); line-height: 1.05; margin: 16px 0 10px; }
.auth-card .sub { color: var(--ink-3); margin-bottom: 28px; }
.field { margin-bottom: 20px; }
.field label { display: block; font-weight: 500; font-size: 15px; margin-bottom: 8px; }
.field input {
  width: 100%; font: 400 16px/1.4 var(--sans); color: var(--ink); background: #FFFFFF;
  border: 1px solid var(--stone-300); border-radius: 4px; padding: 13px 14px;
}
.field input:hover { border-color: var(--muted); }
.field input:focus-visible { outline: 2px solid var(--amber-ink); outline-offset: 1px; border-color: var(--ink); }
.field-help { display: inline-block; margin-top: 10px; font-size: 14px; }
.auth-card .btn { width: 100%; margin-top: 4px; padding: 15px 20px; }
.status { margin-top: 20px; }
.status:empty { display: none; }
.status p { display: flex; gap: 12px; align-items: flex-start; margin: 0; padding: 14px 16px; border: 1px solid var(--amber); border-left-width: 4px; background: #FBF1DF; border-radius: 4px; font-size: 15px; color: var(--ink); }
.status svg { width: 18px; height: 18px; flex: none; margin-top: 3px; color: var(--amber-ink); }
.auth-foot { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px 28px; font-size: 15px; color: var(--muted); text-align: center; }
.auth-foot p { margin: 0; }
.auth-back { display: inline-flex; align-items: center; gap: 8px; color: var(--ink-3); }
.auth-back svg { width: 16px; height: 16px; }

@media (max-width: 480px) {
  .auth { padding-top: 28px; gap: 24px; }
  .auth-main { align-items: flex-start; }
}