/* Shared docs theme - matches 1Key Landing.html */
:root {
  --primary:        #1A56DB;
  --on-primary:     #FFFFFF;
  --primary-container: #D6E4FF;
  --on-primary-container: #001C57;
  --secondary:      #0694A2;
  --tertiary:       #E02424;
  --bg:             #F8FAFF;
  --on-bg:          #1A1C24;
  --surface:        #FFFFFF;
  --on-surface:     #1A1C24;
  --surface-variant:#EEF2FF;
  --on-surface-variant:#44464F;
  --outline:        #74777F;
  --outline-soft:   #E3E7F2;
  --muted:          #5C6072;

  --maxw: 1240px;
  --content-w: 760px;
  --radius-sm: 10px;
  --radius:    16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-card:  0 1px 0 rgba(13,28,73,.04), 0 1px 2px rgba(13,28,73,.04), 0 8px 24px -12px rgba(13,28,73,.10);
  --shadow-pop:   0 24px 60px -20px rgba(13,28,73,.25), 0 4px 14px -8px rgba(13,28,73,.18);

  --font-sans: 'Geist', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --font-serif: 'Instrument Serif', 'Times New Roman', serif;
}
[data-theme="dark"] {
  --primary:        #6C9FFF;
  --on-primary:     #00215D;
  --primary-container: #003399;
  --on-primary-container: #DAE2FF;
  --secondary:      #4ECDC4;
  --tertiary:       #FF6B6B;
  --bg:             #0E1117;
  --on-bg:          #E2E2EC;
  --surface:        #1A1F2E;
  --on-surface:     #E2E2EC;
  --surface-variant:#252A3A;
  --on-surface-variant:#C4C6D0;
  --outline:        #8E9099;
  --outline-soft:   #2A2F40;
  --muted:          #9498AB;
  --shadow-card:  0 1px 0 rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
  --shadow-pop:   0 24px 60px -20px rgba(0,0,0,.7), 0 4px 14px -8px rgba(0,0,0,.6);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--on-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01","cv11";
  line-height: 1.65;
  overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
::selection { background: var(--primary); color: var(--on-primary); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: color-mix(in oklab, var(--bg) 75%, transparent);
  border-bottom: 1px solid color-mix(in oklab, var(--outline-soft) 80%, transparent);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -.01em; color: var(--on-bg); }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--primary); color: var(--on-primary);
  display: grid; place-items: center;
  box-shadow: 0 2px 8px -2px color-mix(in oklab, var(--primary) 60%, transparent);
}
.brand-mark svg { width: 16px; height: 16px; }
.nav-links { display: flex; gap: 4px; align-items: center; }
.nav-links a {
  padding: 8px 12px; border-radius: 8px; font-size: 14.5px;
  color: var(--muted); transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--on-bg); background: var(--surface-variant); text-decoration: none; }
.nav-links a.active { color: var(--primary); background: var(--surface-variant); }
.icon-btn {
  width: 36px; height: 36px; border-radius: 10px;
  border: 1px solid var(--outline-soft);
  background: var(--surface);
  color: var(--on-surface);
  display: grid; place-items: center; cursor: pointer;
  transition: background .15s;
}
.icon-btn:hover { background: var(--surface-variant); }
.nav-cta {
  background: var(--on-bg); color: var(--bg);
  padding: 9px 16px; border-radius: 10px; font-weight: 500; font-size: 14px;
  display: inline-flex; align-items: center; gap: 8px;
}
.nav-cta:hover { text-decoration: none; transform: translateY(-1px); }

/* Doc layout */
.doc-hero {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--outline-soft);
  margin-bottom: 56px;
}
.doc-hero .eyebrow {
  text-transform: uppercase; letter-spacing: .14em;
  font-size: 12px; font-weight: 600; color: var(--primary);
  display: inline-flex; align-items: center; gap: 8px;
}
.doc-hero .eyebrow::before {
  /* Small filled bullet dot before the eyebrow label. Matches the
     middle-dot separator already used in .doc-meta. Previously a
     18x1.5px horizontal bar which read visually as an em-dash. */
  content: ""; width: 6px; height: 6px; background: var(--primary); border-radius: 50%;
}
.doc-hero h1 {
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.04;
  letter-spacing: -.03em;
  font-weight: 600;
  margin: 16px 0 16px;
  max-width: 22ch;
}
.doc-hero h1 em {
  font-family: var(--font-serif); font-style: italic; font-weight: 400;
  color: var(--primary); letter-spacing: -.02em;
}
.doc-hero .lede {
  color: var(--muted); font-size: 19px; max-width: 64ch; margin: 0;
}
.doc-meta {
  display: flex; gap: 16px; flex-wrap: wrap; margin-top: 24px;
  color: var(--muted); font-size: 13px;
  font-family: var(--font-mono);
  text-transform: uppercase; letter-spacing: .08em;
}
.doc-meta span { display: inline-flex; align-items: center; gap: 6px; }
.doc-meta b { color: var(--on-bg); font-weight: 600; }
.doc-meta .pill {
  background: var(--surface-variant); color: var(--on-surface-variant);
  padding: 4px 10px; border-radius: 999px; font-size: 11.5px;
}

/* Two-column doc body: TOC + content */
.doc-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
  align-items: start;
  padding-bottom: 96px;
}
.toc {
  position: sticky; top: 88px;
  align-self: start;
  font-size: 13.5px;
  border-left: 1px solid var(--outline-soft);
  padding-left: 16px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}
.toc h5 {
  margin: 0 0 14px; font-size: 11.5px;
  text-transform: uppercase; letter-spacing: .14em;
  color: var(--muted); font-weight: 600;
}
.toc ol { list-style: none; padding: 0; margin: 0; counter-reset: tocn; }
.toc li { counter-increment: tocn; }
.toc a {
  display: flex; gap: 10px; align-items: baseline;
  color: var(--muted); padding: 10px 0;
  border-radius: 6px;
  transition: color .15s;
}
.toc a:hover { color: var(--on-bg); text-decoration: none; }
.toc a::before {
  content: counter(tocn, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 11px; color: var(--primary);
  opacity: .7;
  flex-shrink: 0;
}
.toc a.active { color: var(--primary); font-weight: 500; }

/* Prose */
.prose {
  max-width: var(--content-w);
  /* As a grid item inside .doc-grid (1fr or 240px+1fr depending on
     viewport), allow the column to shrink below its content's natural
     min-width. Without this, wide children (<pre>, <table>, long
     unbreakable code tokens) force the prose column wider than 1fr
     and produce horizontal page scroll on phones. */
  min-width: 0;
}
.prose > * + * { margin-top: 1.05em; }
/* Ensure block content inside .prose obeys the column width so wide
   children scroll INSIDE their own overflow boxes instead of pushing
   the parent wider. */
.prose p, .prose ul, .prose ol, .prose .callout, .prose .lim-card,
.prose .stat-row, .prose .flow, .prose .acro {
  min-width: 0;
  max-width: 100%;
}
.prose h2 {
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.15; letter-spacing: -.02em; font-weight: 600;
  margin: 64px 0 8px; padding-top: 24px;
  scroll-margin-top: 88px;
}
/* Zero the top margin ONLY when the h2 is literally the first thing in
   the article. Previously :first-of-type, which matches the first h2
   in the article even if a callout precedes it - that collapsed the
   Privacy Policy's TL;DR callout straight into "What we don't collect". */
.prose h2:first-child { margin-top: 0; padding-top: 0; }
/* When an h2 immediately follows a callout (the TL;DR pattern on the
   Privacy Policy), the heading doesn't need 64+24=88px above it - the
   callout already provides visual separation. Tighten to 32px so the
   two read as part of the same "intro then first section" flow. */
.prose .callout + h2 { margin-top: 32px; padding-top: 0; }
.prose h2 em { font-family: var(--font-serif); font-style: italic; font-weight: 400; color: var(--primary); }
.prose h2 .num {
  display: inline-block; min-width: 1.5em;
  font-family: var(--font-mono); font-size: .55em; font-weight: 500;
  color: var(--primary); vertical-align: middle;
  margin-right: 12px;
  letter-spacing: 0;
}
.prose h3 {
  font-size: 19px; font-weight: 600; letter-spacing: -.005em;
  margin: 40px 0 4px; scroll-margin-top: 88px;
}
.prose h3 .num {
  display: inline-block;
  font-family: var(--font-mono); font-size: 12px; color: var(--muted);
  margin-right: 10px; font-weight: 500;
}
.prose p { margin: 0; color: var(--on-bg); font-size: 16.5px; }
.prose p.muted { color: var(--muted); }
.prose ul, .prose ol { padding-left: 22px; margin: 0; }
.prose ul li, .prose ol li { margin-bottom: 6px; font-size: 16.5px; }
.prose ul li::marker { color: var(--primary); }
.prose strong, .prose b { color: var(--on-bg); font-weight: 600; }
.prose code {
  font-family: var(--font-mono); font-size: .88em;
  background: var(--surface-variant);
  padding: 2px 6px; border-radius: 6px;
  color: var(--on-surface);
  word-break: break-word;
  overflow-wrap: anywhere;
}
.prose pre {
  background: #0a0d14;
  color: #E2E2EC;
  border-radius: var(--radius);
  padding: 18px 22px;
  overflow-x: auto;
  font-family: var(--font-mono); font-size: 13.5px; line-height: 1.7;
  border: 1px solid #1a1f2e;
}
.prose pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; }
.prose blockquote {
  border-left: 3px solid var(--primary);
  padding: 4px 0 4px 20px;
  margin: 0;
  color: var(--muted);
  font-style: italic;
}

/* Section card - used for whitepaper section wrappers and intro callouts */
.callout {
  border: 1px solid var(--outline-soft);
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  box-shadow: var(--shadow-card);
}
.callout.primary {
  border-color: color-mix(in oklab, var(--primary) 22%, var(--outline-soft));
  background: color-mix(in oklab, var(--primary-container) 40%, var(--surface));
}
.callout.warn {
  border-color: color-mix(in oklab, var(--tertiary) 24%, var(--outline-soft));
  background: color-mix(in oklab, var(--tertiary) 5%, var(--surface));
}
.callout-head {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--primary);
  margin-bottom: 12px;
}
.callout.warn .callout-head { color: var(--tertiary); }
.callout-head svg { width: 16px; height: 16px; }
.callout p { font-size: 15.5px; }

/* Tables */
.prose table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--outline-soft);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14.5px;
  background: var(--surface);
  box-shadow: var(--shadow-card);
}
.prose th, .prose td {
  text-align: left;
  padding: 14px 18px;
  border-bottom: 1px solid var(--outline-soft);
  vertical-align: top;
}
.prose tr:last-child td { border-bottom: 0; }
.prose th {
  background: var(--surface-variant);
  color: var(--on-surface-variant);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.prose td b, .prose td strong { color: var(--on-bg); }

/* FAQ-specific: question/answer card */
.qa {
  border: 1px solid var(--outline-soft);
  border-radius: var(--radius);
  background: var(--surface);
  margin-top: 14px;
  overflow: hidden;
  transition: border-color .15s;
}
.qa:hover { border-color: color-mix(in oklab, var(--primary) 30%, var(--outline-soft)); }
.qa summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  font-size: 16.5px; font-weight: 500; letter-spacing: -.005em;
  color: var(--on-bg);
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after {
  content: ""; flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--surface-variant);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231A56DB' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-position: center; background-repeat: no-repeat;
  transition: transform .2s ease;
}
.qa[open] summary::after { transform: rotate(180deg); }
.qa-body {
  padding: 0 22px 22px;
  border-top: 1px solid var(--outline-soft);
  padding-top: 18px;
  color: var(--on-bg);
  font-size: 15.5px;
}
.qa-body > * + * { margin-top: 12px; }
.qa-body p { margin: 0; font-size: inherit; }
.qa-body ul { padding-left: 20px; }
.qa-body li { font-size: inherit; }

/* Doc footer */
.doc-foot {
  border-top: 1px solid var(--outline-soft);
  padding: 56px 0 64px;
  margin-top: 0;
  font-size: 14.5px;
  color: var(--muted);
}
.doc-foot-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
  align-items: center;
}
.doc-foot a { color: var(--on-bg); }
.doc-foot a:hover { color: var(--primary); }
/* .doc-foot a above beats .btn-primary on specificity (class + tag). Reassert
   on-primary so the Download APK button keeps white text + white arrow icon
   (the SVG uses stroke="currentColor"). */
.doc-foot a.btn-primary,
.doc-foot a.btn-primary:hover { color: var(--on-primary); }
.doc-foot-cta {
  display: flex; gap: 12px; justify-content: flex-end; flex-wrap: wrap;
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 10px;
  font-size: 14px; font-weight: 500;
  border: 1px solid var(--outline-soft);
  background: var(--surface); color: var(--on-bg);
  cursor: pointer;
}
.btn:hover { background: var(--surface-variant); text-decoration: none; }
.btn-primary {
  background: var(--primary); color: var(--on-primary); border-color: var(--primary);
}
.btn-primary:hover { background: color-mix(in oklab, var(--primary) 88%, #000); color: var(--on-primary); }
.btn svg { width: 14px; height: 14px; }

/* Class hooks introduced for responsive control. Pre-existing markup that
   used inline-style grids/flex (the #docs section grid in index.html, the
   right-hand nav cluster in every docs page) now references these classes
   so the @media rules below can target them. */
.nav-cta { white-space: nowrap; flex-shrink: 0; }
.nav-actions { display: flex; gap: 10px; align-items: center; flex-shrink: 0; }
.docs-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 48px; align-items: start; }
/* docs-cards stays 3-across at EVERY viewport per user request "horizontal
   like before, while adhering to responsiveness". minmax(0, 1fr) lets the
   tracks shrink below their content's natural min-width so narrow phones
   keep the row instead of stacking. */
.docs-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.docs-cards .get-card { min-width: 0; }
.docs-cards .get-card h3,
.docs-cards .get-card p { overflow-wrap: anywhere; word-break: break-word; }

/* Responsive */
@media (max-width: 980px) {
  .doc-grid { grid-template-columns: 1fr; gap: 32px; }
  .toc { position: static; max-height: none; border-left: 0; padding-left: 0;
         border-top: 1px solid var(--outline-soft); padding-top: 24px; }
  .nav-links { display: none; }
  .doc-foot-grid { grid-template-columns: 1fr; }
  .doc-foot-cta { justify-content: flex-start; }
  /* Bump TOC link rows to a 44px touch target for tablet+phone (was OK at
     desktop with the borderless rail; once stacked, taps need room). */
  .toc a { padding: 12px 0; min-height: 44px; align-items: center; }
  /* Tighten h2 spacing when the layout collapses - the desktop 64+24=88px
     stack above each section is excessive when the TOC and doc-hero already
     consume the upper viewport. Drops the gap to 40+12=52px. */
  .prose h2 { margin: 40px 0 6px; padding-top: 12px; }
  .prose h2:first-child { margin-top: 0; padding-top: 0; }
  .prose .callout + h2 { margin-top: 24px; padding-top: 0; }
  /* Icon button hits 44px from this breakpoint down (was 480 only),
     matching tap-target guidelines on tablets too. */
  .icon-btn { width: 44px; height: 44px; }
  /* Docs section restacks to a single column when content area drops
     below ~880px usable width. The 3 doc cards keep their horizontal
     layout because the collapsed outer grid now gives them the full
     content row to share. */
  .docs-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* Wide tables: scroll horizontally instead of clipping on phones / tablets. */
@media (max-width: 768px) {
  .prose table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  /* Allow cell text to wrap on long unbroken strings (comma-separated
     lockout schedule rows, etc.) before falling back to nested scroll. */
  .prose table td, .prose table th {
    word-break: break-word;
    overflow-wrap: anywhere;
  }
}

/* Pinch the wrap gutter earlier than 480px so 481-640 phones (large
   Pixels, iPhone Pro Max in landscape-portrait split) get the same
   comfortable 16px inset rather than 28px which crowds .qa cards. */
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
}

/* Phone-specific (<= 480px): larger touch targets + tighter doc-hero +
   prose reflow. Reclaims content width without sacrificing legibility. */
@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .icon-btn { width: 44px; height: 44px; }
  .nav-cta { padding: 11px 14px; min-height: 44px; font-size: 13px; }
  .btn { padding: 12px 18px; min-height: 44px; }
  .nav-actions { gap: 8px; }
  .doc-hero { padding: 32px 0 24px; margin-bottom: 32px; }
  .doc-hero h1 { letter-spacing: -.02em; line-height: 1.1; }
  .callout { padding: 18px 16px; border-radius: var(--radius); }
  .prose h2 { margin: 40px 0 6px; padding-top: 12px; }
  .prose h2 .num { min-width: 0; margin-right: 8px; }
  .prose h3 { margin: 28px 0 4px; }
  .prose ul, .prose ol { padding-left: 18px; }
  .prose ul li, .prose ol li { font-size: 15.5px; line-height: 1.55; }
  .prose pre { padding: 14px 16px; font-size: 12.5px; }
  /* .docs-cards keeps its 3-col layout (defined in the base block) but
     uses a tighter gap on phones. minmax(0, 1fr) on the tracks lets
     each card shrink as needed; .get-card { min-width: 0 } + child
     overflow-wrap absorb long unbreakable tokens like "Cryptographic". */
  .docs-cards { gap: 8px; }
  .docs-cards .get-card { padding: 16px !important; }
  .docs-cards .get-card h3 { font-size: 15px !important; }
  .docs-cards .get-card p { font-size: 12.5px !important; }
}

/* Narrowest phones (<= 380px): trim the nav CTA so brand + theme +
   Download stay on one row. Drop the trailing arrow icon (visually
   redundant on a button labeled "Download APK") and tighten padding.
   Avoids the font-size:0 hidden-text accessibility pitfall. */
@media (max-width: 380px) {
  .nav-cta { font-size: 13px; padding: 10px 12px; gap: 6px; min-height: 44px; }
  .nav-cta svg { display: none; }
}