/* ============================================================
   elvaro docs — design system
   Editorial fintech: Fraunces display · Inter body · Plex Mono labels
   ============================================================ */
:root {
  /* Brand */
  --forest: #192824;
  --forest-2: #22352f;
  --fresh: #91e28c;
  --mesh: #e4ffe2;
  --mesh30: #d9ffd6;
  --muted-green: #e5f5e4;
  --pine: #607268;
  --neutral: #eeede1;
  --butter: #fffbcf;
  --alert: #ff1f57;
  --border: #e8e8e4;
  --paper: #ffffff;
  --cream: #fbfdf9;
  --ink-soft: #33413c;
  --link: #1d7a28;

  /* Type */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', SFMono-Regular, Menlo, monospace;

  /* Elevation */
  --shadow-sm: 0 1px 2px rgba(25, 40, 36, .05);
  --shadow-md: 0 6px 24px -6px rgba(25, 40, 36, .12);
  --shadow-lg: 0 20px 50px -12px rgba(25, 40, 36, .22);

  /* Radii */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;

  /* Chrome */
  --topbar-h: 60px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
img { max-width: 100%; }
body {
  font-family: var(--font-body);
  color: var(--forest);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--fresh); color: var(--forest); }
:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; border-radius: 4px; }

/* Grain — barely-there paper texture */
body::after {
  content: '';
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: .022; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Skip link */
.skip-link {
  position: fixed; top: -48px; left: 16px; z-index: 200;
  background: var(--forest); color: var(--fresh);
  padding: 10px 18px; border-radius: 0 0 12px 12px;
  font: 600 14px var(--font-body); text-decoration: none;
  transition: top .2s ease;
}
.skip-link:focus { top: 0; }

/* Reading progress */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2.5px; z-index: 120;
  background: linear-gradient(90deg, var(--fresh), #4caf7d 60%, var(--forest));
  transform-origin: 0 50%; transform: scaleX(0);
}

/* ============ Top bar ============ */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; height: var(--topbar-h);
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, .85); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  position: sticky; top: 0; z-index: 50;
  transition: box-shadow .3s ease;
}
.topbar.scrolled { box-shadow: 0 8px 30px rgba(25, 40, 36, .07); }
.topbar .tb-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--forest); font-weight: 600; font-size: 18px; }
.topbar .tb-docs {
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 600; letter-spacing: 2px;
  color: var(--pine); background: var(--mesh); padding: 3px 9px; border-radius: 100px;
}
.topbar .tb-right { display: flex; align-items: center; gap: 22px; }
.topbar .tb-link { text-decoration: none; color: var(--pine); font-size: 14px; font-weight: 500; transition: color .15s ease; }
.topbar .tb-link:hover { color: var(--forest); }
.topbar .tb-cta {
  text-decoration: none; background: var(--forest); color: var(--fresh);
  font-size: 14px; font-weight: 600; padding: 9px 20px; border-radius: 100px;
  transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}
.topbar .tb-cta:hover { background: var(--forest-2); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.topbar .tb-cta:active { transform: translateY(0) scale(.98); }

/* Hamburger (JS-injected, mobile only) */
.menu-btn {
  display: none; align-items: center; justify-content: center;
  width: 40px; height: 40px; border: 1px solid var(--border); border-radius: 12px;
  background: #fff; cursor: pointer; color: var(--forest);
}
.menu-btn svg { width: 18px; height: 18px; }

/* ============ Layout ============ */
.layout { display: flex; min-height: calc(100vh - var(--topbar-h)); }
.sidebar {
  width: 280px; flex-shrink: 0; border-right: 1px solid var(--border);
  padding: 34px 22px 28px; position: sticky; top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h)); overflow-y: auto;
  background: linear-gradient(180deg, #fff 0%, var(--cream) 100%);
  scrollbar-width: thin;
}
.sidebar .logo, .sidebar .docs-tag { display: none; }
.nav-group { margin-bottom: 24px; }
.nav-group h4 {
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 600;
  letter-spacing: 1.8px; text-transform: uppercase; color: var(--pine); margin-bottom: 8px; padding-left: 12px;
}
.nav-group a {
  display: block; padding: 7px 12px; border-radius: var(--r-sm); text-decoration: none;
  color: var(--ink-soft); font-size: 14.5px; margin-bottom: 2px; position: relative;
  transition: background .15s ease, color .15s ease, transform .15s ease;
}
.nav-group a:hover { background: var(--mesh); color: var(--forest); transform: translateX(2px); }
.nav-group a.active { background: var(--mesh); font-weight: 600; color: var(--forest); }
.nav-group a.active::before {
  content: ''; position: absolute; left: 0; top: 8px; bottom: 8px; width: 3px;
  border-radius: 3px; background: var(--fresh);
}

.main { flex: 1; min-width: 0; position: relative; z-index: 2; }
.content { max-width: 820px; margin: 0 auto; padding: 56px 48px 100px; }

/* ============ Typography ============ */
.kicker {
  font-family: var(--font-mono); font-size: 12px; font-weight: 600;
  letter-spacing: 3px; text-transform: uppercase; color: var(--link); margin-bottom: 14px;
  display: flex; align-items: center; gap: 10px;
}
.kicker::before { content: ''; width: 22px; height: 1.5px; background: var(--fresh); display: inline-block; }
h1 {
  font-family: var(--font-display); font-optical-sizing: auto;
  font-size: clamp(34px, 5.2vw, 48px); font-weight: 560; letter-spacing: -0.6px;
  line-height: 1.08; margin-bottom: 20px; text-wrap: balance;
}
h2 {
  font-family: var(--font-display); font-optical-sizing: auto;
  font-size: clamp(24px, 3vw, 30px); font-weight: 560; letter-spacing: -0.3px;
  margin: 52px 0 14px; padding-top: 12px; scroll-margin-top: calc(var(--topbar-h) + 24px);
  position: relative;
}
h3 { font-size: 19px; font-weight: 700; margin: 32px 0 10px; letter-spacing: -0.2px; scroll-margin-top: calc(var(--topbar-h) + 24px); }
p { margin-bottom: 16px; color: var(--ink-soft); font-size: 16.5px; }
.lead { font-size: clamp(18px, 2.2vw, 20px); color: var(--pine); line-height: 1.55; margin-bottom: 28px; text-wrap: pretty; }
strong { color: var(--forest); }
a.inline { color: var(--link); font-weight: 600; text-decoration-color: rgba(29, 122, 40, .3); text-underline-offset: 3px; transition: text-decoration-color .15s ease; }
a.inline:hover { text-decoration-color: var(--link); }
code, kbd {
  font-family: var(--font-mono); font-size: .88em;
  background: var(--cream); border: 1px solid var(--border);
  padding: 1px 7px; border-radius: 7px;
}

/* Heading anchors (JS) */
.h-anchor {
  position: absolute; left: -26px; top: 50%; transform: translateY(-38%);
  opacity: 0; text-decoration: none; color: var(--pine); font-size: 18px;
  font-family: var(--font-body); transition: opacity .15s ease;
}
h2:hover .h-anchor { opacity: .7; }
.h-anchor:hover { opacity: 1 !important; color: var(--link); }

/* ============ Components ============ */
.callout {
  background: var(--mesh); border: 1px solid var(--mesh30); border-left: 3px solid var(--fresh);
  border-radius: var(--r-md); padding: 18px 22px; margin: 24px 0; font-size: 15.5px;
}
.callout.warn { background: #fff5f7; border-color: #ffd4de; border-left-color: var(--alert); }
.callout.note { background: var(--butter); border-color: #f0ecc0; border-left-color: #e3d95a; }
.callout b { display: block; margin-bottom: 4px; }

.diagram {
  margin: 32px 0; background: var(--cream); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 28px; overflow-x: auto;
}
.diagram figcaption {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .4px;
  color: var(--pine); margin-top: 14px; text-align: center;
}

.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 24px 0; }
.card {
  border: 1px solid var(--border); border-radius: var(--r-md); padding: 20px 22px; background: #fff;
  transition: transform .22s cubic-bezier(.22, .61, .36, 1), box-shadow .22s ease, border-color .22s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: #cfe9cc; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { font-size: 14.5px; margin: 0; color: var(--pine); }
.card .icon { font-size: 24px; margin-bottom: 10px; display: block; }

table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; }
th {
  text-align: left; font-family: var(--font-mono); font-size: 12px; font-weight: 600;
  letter-spacing: 1px; text-transform: uppercase; padding: 11px 14px; background: var(--mesh); color: var(--forest);
}
th:first-child { border-radius: var(--r-sm) 0 0 var(--r-sm); }
th:last-child { border-radius: 0 var(--r-sm) var(--r-sm) 0; }
td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
tbody tr { transition: background .15s ease; }
tbody tr:hover { background: var(--cream); }

.pill {
  display: inline-block; padding: 3px 12px; border-radius: 100px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 600; letter-spacing: .3px;
}
.pill.green { background: var(--mesh); color: var(--link); }
.pill.red { background: #ffe3ea; color: var(--alert); }
.pill.butter { background: var(--butter); color: var(--forest); }

/* Page nav footer */
.page-nav { display: flex; justify-content: space-between; margin-top: 64px; gap: 16px; }
.page-nav a {
  text-decoration: none; border: 1px solid var(--border); border-radius: 14px;
  padding: 14px 20px; color: var(--forest); font-size: 14.5px; flex: 1;
  transition: background .18s ease, border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.page-nav a:hover { background: var(--cream); border-color: #cfe9cc; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.page-nav .dir {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--pine); display: block; margin-bottom: 2px;
}
.page-nav .next { text-align: right; }

/* CTA */
.cta-row { margin: 32px 0; }
.cta-btn {
  display: inline-block; background: var(--butter); color: var(--forest); font-weight: 600;
  font-size: 16px; padding: 14px 30px; border-radius: 100px; text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.cta-btn:hover { background: #fff9a8; transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* Hero atmosphere */
.hero-glow { position: relative; }
.hero-glow::before {
  content: ''; position: absolute; width: 520px; height: 520px; border-radius: 50%;
  background: radial-gradient(circle, rgba(145, 226, 140, .2) 0%, rgba(255, 251, 207, .12) 45%, rgba(255, 255, 255, 0) 70%);
  top: -230px; right: -130px; pointer-events: none;
}
.hero-glow::after {
  content: ''; position: absolute; top: 0; right: 0; width: 380px; height: 300px; pointer-events: none;
  background-image: radial-gradient(rgba(25, 40, 36, .13) 1px, transparent 1px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(ellipse at top right, #000 15%, transparent 70%);
  mask-image: radial-gradient(ellipse at top right, #000 15%, transparent 70%);
}

/* Buttons */
.btn-row { display: flex; gap: 14px; margin: 30px 0 6px; flex-wrap: wrap; }
.btn-primary {
  display: inline-block; background: var(--forest); color: var(--fresh); font-weight: 600;
  font-size: 15.5px; padding: 14px 28px; border-radius: 100px; text-decoration: none;
  transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}
.btn-primary:hover { background: var(--forest-2); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-primary:active { transform: translateY(0) scale(.98); }
.btn-secondary {
  display: inline-block; background: #fff; border: 1px solid var(--border); color: var(--forest);
  font-weight: 600; font-size: 15.5px; padding: 14px 28px; border-radius: 100px; text-decoration: none;
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}
.btn-secondary:hover { background: var(--mesh); border-color: #cfe9cc; transform: translateY(-2px); }

/* Stat strip */
.stats { display: flex; gap: 0; border: 1px solid var(--border); border-radius: 18px; margin: 36px 0; overflow: hidden; background: #fff; }
.stats .stat { flex: 1; padding: 22px 24px; border-right: 1px solid var(--border); transition: background .2s ease; }
.stats .stat:hover { background: var(--cream); }
.stats .stat:last-child { border-right: none; }
.stats .n {
  font-family: var(--font-display); font-optical-sizing: auto;
  font-size: 30px; font-weight: 560; letter-spacing: -0.5px; color: var(--forest); display: block;
}
.stats .l { font-size: 13px; color: var(--pine); margin-top: 2px; display: block; }

/* ============ Pricing ============ */
.pricing { display: grid; grid-template-columns: 1fr 1.15fr; gap: 20px; margin: 32px 0; align-items: stretch; }
.price-card {
  border: 1px solid var(--border); border-radius: var(--r-lg); padding: 30px 30px 26px;
  background: #fff; display: flex; flex-direction: column;
  transition: transform .22s cubic-bezier(.22, .61, .36, 1), box-shadow .22s ease;
}
.price-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.price-card.featured {
  border: 2px solid var(--fresh);
  background: linear-gradient(180deg, #fbfffb 0%, #fff 60%);
  position: relative; box-shadow: 0 12px 40px -14px rgba(145, 226, 140, .5);
}
.price-card .plan-name {
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 600;
  letter-spacing: 2px; text-transform: uppercase; color: var(--pine);
}
.price-card .price {
  font-family: var(--font-display); font-optical-sizing: auto;
  font-size: 48px; font-weight: 560; letter-spacing: -1.5px; color: var(--forest); margin: 10px 0 2px;
}
.price-card .price .per { font-family: var(--font-body); font-size: 16px; font-weight: 500; color: var(--pine); letter-spacing: 0; }
.price-card .strike { font-family: var(--font-body); font-size: 15px; color: var(--pine); text-decoration: line-through; margin-right: 8px; font-weight: 400; }
.price-card .promo-badge {
  position: absolute; top: -14px; right: 22px; background: var(--fresh); color: var(--forest);
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 600; letter-spacing: .3px;
  padding: 6px 14px; border-radius: 100px; box-shadow: var(--shadow-sm);
}
.price-card ul { list-style: none; margin: 18px 0 22px; flex: 1; }
.price-card li { padding: 7px 0 7px 26px; position: relative; font-size: 15px; color: var(--ink-soft); }
.price-card li::before { content: '✓'; position: absolute; left: 0; color: var(--link); font-weight: 700; }
.price-card .plan-cta { text-align: center; }
.pay-methods { display: flex; gap: 10px; margin-top: 14px; justify-content: center; font-size: 13px; color: var(--pine); flex-wrap: wrap; }
.pay-pill {
  border: 1px solid var(--border); border-radius: 100px; padding: 5px 14px; font-weight: 600;
  display: inline-flex; align-items: center; gap: 8px; background: #fff;
}
.pay-pill img { height: 15px; width: auto; display: block; }

/* Payment logos */
.pay-logos { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin: 18px 0 26px; }
.pay-logos .stripe-badge { height: 58px; width: auto; }
.pay-logos .cards-strip { height: 34px; width: auto; }
.pay-logos .usdc-logo { height: 44px; width: auto; }
.pay-logos .pay-caption { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .3px; color: var(--pine); }

/* ============ On-page TOC (desktop) ============ */
.toc { position: fixed; top: 110px; right: 32px; width: 210px; font-size: 13px; display: none; }
@media (min-width: 1360px) { .toc { display: block; } }
.toc h5 {
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 600;
  letter-spacing: 1.8px; text-transform: uppercase; color: var(--pine); margin-bottom: 10px;
}
.toc a {
  display: block; color: var(--pine); text-decoration: none; padding: 4px 0 4px 12px;
  border-left: 2px solid var(--border); line-height: 1.4;
  transition: color .15s ease, border-color .15s ease;
}
.toc a:hover { color: var(--forest); border-left-color: var(--fresh); }
.toc a.active { color: var(--link); border-left-color: var(--fresh); font-weight: 600; }

/* ============ Footer ============ */
.site-footer {
  margin-top: 72px; padding-top: 28px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 13.5px; color: var(--pine);
}
.site-footer a { color: var(--pine); text-decoration: none; font-weight: 500; transition: color .15s ease; }
.site-footer a:hover { color: var(--forest); }
.site-footer .f-links { display: flex; gap: 20px; }

/* ============ Mobile drawer (JS-injected) ============ */
.drawer-backdrop {
  position: fixed; inset: 0; background: rgba(25, 40, 36, .42);
  backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
  opacity: 0; pointer-events: none; transition: opacity .32s ease; z-index: 90;
}
.drawer-backdrop.open { opacity: 1; pointer-events: auto; }
.drawer {
  position: fixed; top: 0; left: 0; bottom: 0; width: min(320px, 86vw);
  background: #fff; z-index: 95; display: flex; flex-direction: column;
  transform: translateX(-103%); transition: transform .38s cubic-bezier(.32, .72, 0, 1);
  box-shadow: 24px 0 60px rgba(25, 40, 36, .18);
}
.drawer.open { transform: none; }
.drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px 14px 20px; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.drawer-head .d-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--forest); font-weight: 600; font-size: 17px; }
.drawer-close {
  width: 38px; height: 38px; border: 1px solid var(--border); border-radius: 12px;
  background: #fff; cursor: pointer; color: var(--forest); display: grid; place-items: center;
}
.drawer nav { overflow-y: auto; padding: 22px 20px 48px; flex: 1; }
.drawer .nav-group a { font-size: 15px; padding: 9px 12px; }
.drawer-cta { padding: 16px 20px calc(16px + env(safe-area-inset-bottom)); border-top: 1px solid var(--border); flex-shrink: 0; }
.drawer-cta a {
  display: block; text-align: center; background: var(--forest); color: var(--fresh);
  font-weight: 600; font-size: 15px; padding: 13px; border-radius: 100px; text-decoration: none;
}
body.drawer-open { overflow: hidden; }

/* ============ Mobile sub-bar (JS-injected) ============ */
.subnav { display: none; }

/* ============ Back to top (JS-injected) ============ */
.to-top {
  position: fixed; right: 20px; bottom: calc(20px + env(safe-area-inset-bottom));
  width: 46px; height: 46px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--forest); color: var(--fresh); display: grid; place-items: center;
  box-shadow: var(--shadow-lg); z-index: 80;
  opacity: 0; transform: translateY(14px) scale(.9); pointer-events: none;
  transition: opacity .28s ease, transform .28s cubic-bezier(.22, .61, .36, 1), background .18s ease;
}
.to-top.show { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { background: var(--forest-2); transform: translateY(-3px); }
.to-top svg { width: 17px; height: 17px; }

/* ============ Scroll reveal ============ */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s cubic-bezier(.22, .61, .36, 1); }
.reveal.in { opacity: 1; transform: none; }

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .layout { overflow-x: clip; }
  .layout { flex-direction: column; }
  .sidebar { display: none; }
  .menu-btn { display: inline-flex; }
  .topbar { padding: 0 16px; }
  .topbar .tb-right { gap: 12px; }

  .subnav {
    display: flex; align-items: center; gap: 8px;
    position: sticky; top: var(--topbar-h); z-index: 45;
    background: rgba(255, 255, 255, .92); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border); padding: 0 16px; height: 44px;
    font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .8px;
    text-transform: uppercase; color: var(--pine);
    white-space: nowrap; overflow: hidden;
  }
  .subnav .sep { opacity: .5; }
  .subnav .here { color: var(--forest); font-weight: 600; overflow: hidden; text-overflow: ellipsis; }

  .content { padding: 34px 20px 80px; }
  .cards { grid-template-columns: 1fr; }
  .lead { font-size: 17.5px; }
  .hero-glow::before, .hero-glow::after { display: none; }
  .stats { flex-direction: column; }
  .stats .stat { border-right: none; border-bottom: 1px solid var(--border); }
  .stats .stat:last-child { border-bottom: none; }
  .page-nav { flex-direction: column; }
  .page-nav .next { text-align: left; }
  .diagram { padding: 18px; border-radius: var(--r-md); }
  table { display: block; overflow-x: auto; }
  .h-anchor { display: none; }
}
@media (max-width: 640px) {
  .topbar .tb-link { display: none; }
  .price-card { padding: 24px 20px 22px; }
  .price-card .price { font-size: 40px; }
  .pay-logos { gap: 12px; }
  .pay-logos .stripe-badge { height: 48px; }
  .pay-logos .cards-strip { height: 28px; }
  .pay-logos .usdc-logo { height: 36px; }
  .to-top { right: 16px; width: 44px; height: 44px; }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}