:root {
  --bg: #04140d;
  --raise: #0a2118;
  --raise-2: #0e2b20;
  --line: #1d4535;
  --line-strong: #2b6149;
  --text: #e4f3eb;
  --muted: #a6c8b6;
  --green: #4ade80;
  --green-soft: #86efac;
  --mint: #bbf7d0;
  --emerald: #10b981;
  --prose: #d3e7dc;
  --tint: rgba(74, 222, 128, 0.14);
  --tint-soft: rgba(74, 222, 128, 0.08);
  --ready-glow: rgba(74, 222, 128, 0.16);
  --code-bg: #061a12;
  --code-text: #d9ece2;
  --code-key: #4ade80;
  --code-fn: #e4f3eb;
  --code-builtin: #34d399;
  --code-str: #bbf7d0;
  --code-comment: #8fb5a1;
  --code-num: #6ee7b7;
  --code-op: #a6c8b6;
  --page-bg:
    radial-gradient(1100px 600px at 85% -10%, rgba(16, 185, 129, 0.20), transparent 60%),
    radial-gradient(900px 520px at -10% 30%, rgba(74, 222, 128, 0.09), transparent 60%),
    radial-gradient(800px 500px at 50% 110%, rgba(20, 83, 45, 0.45), transparent 70%),
    #04140d;
  color-scheme: dark;
}

/* Light: a white page, green borders. Dark above is the default; theme.js sets data-theme="light"
   only when the visitor chose it with the button in the header. */
:root[data-theme="light"] {
  --bg: #ffffff;
  --raise: #ffffff;
  --raise-2: #f3fbf6;
  --line: #86efac;
  --line-strong: #16a34a;
  --text: #0c2a1c;
  --muted: #3f5f4f;
  --green: #15803d;
  --green-soft: #166534;
  --mint: #14532d;
  --emerald: #047857;
  --prose: #1f3a2d;
  --tint: rgba(22, 163, 74, 0.10);
  --tint-soft: rgba(22, 163, 74, 0.07);
  --ready-glow: rgba(22, 163, 74, 0.08);
  --code-bg: #f6fbf8;
  --code-text: #0c2a1c;
  --code-key: #15803d;
  --code-fn: #0c2a1c;
  --code-builtin: #047857;
  --code-str: #0f766e;
  --code-comment: #5b7a6a;
  --code-num: #0e7490;
  --code-op: #3f5f4f;
  --page-bg: #ffffff;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--page-bg);
}

a { color: var(--green-soft); text-underline-offset: 3px; }
a:hover { color: var(--mint); }
a:focus-visible, .btn:focus-visible, .sdk:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
}

.wrap { width: min(1080px, 100% - 40px); margin-inline: auto; }

/* Header */
.top {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 28px;
  padding: 22px 0;
}
.top nav { margin-left: auto; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--text); }
.mark { width: 32px; height: 32px; }
nav { display: flex; flex-wrap: wrap; gap: 6px 22px; }
nav a { padding: 6px 0; color: var(--muted); text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--mint); }

/* Hero */
/* The first screen holds the hero alone; the introduction waits below the fold. */
.hero {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  align-items: center;
  align-content: center;
  gap: 40px;
  min-height: calc(100vh - 72px);
  min-height: calc(100svh - 72px);
  padding: 24px 0 48px;
}
.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  font-weight: 600;
}
h1 {
  margin: 0 0 18px;
  font-size: clamp(2.4rem, 6.2vw, 6.4rem);
  font-size: clamp(2.4rem, min(6.2vw, 11svh), 6.4rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
  overflow-wrap: break-word;
  text-wrap: balance;
}
.tagline {
  margin: 0 0 32px;
  margin: 0 0 clamp(22px, 4.5svh, 44px);
  font-size: clamp(1.4rem, 2.7vw, 2.5rem);
  font-size: clamp(1.4rem, min(2.7vw, 4.8svh), 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.hl { color: var(--green); }
.intro { padding: 64px 0 48px; }
.lead { margin: 0; max-width: 46em; color: var(--muted); font-size: clamp(1.15rem, 1.7vw, 1.45rem); }
.actions { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-block;
  padding: 13px 22px;
  min-height: 48px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-weight: 600;
  text-decoration: none;
}
.btn.primary { background: var(--green); color: var(--bg); }
.btn.primary:hover { background: var(--green-soft); color: var(--bg); }
.btn.ghost { border: 1px solid var(--line-strong); color: var(--text); }
.btn.ghost:hover { border-color: var(--green); color: var(--mint); }
.phone { width: 100%; max-width: 380px; max-width: min(460px, 50svh); justify-self: center; }

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-bottom: 80px;
}
.steps article {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, var(--raise-2), var(--raise));
}
.num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin: 0 0 14px;
  border-radius: 50%;
  background: var(--tint);
  color: var(--green);
  font-weight: 700;
}
.steps h2 { margin: 0 0 8px; font-size: 1.35rem; }
.steps p { margin: 0 0 12px; color: var(--muted); }
.steps p:last-child { margin-bottom: 0; }
.links { display: flex; flex-wrap: wrap; gap: 6px 18px; }

/* SDKs */
.sdks { padding-bottom: 90px; }
.sdks h2 { margin: 0 0 6px; font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -0.02em; }
.sub { margin: 0 0 28px; color: var(--muted); }
.grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.sdk {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 170px;
  padding: 22px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--raise);
  color: var(--text);
  text-decoration: none;
}
.sdk .state {
  align-self: flex-start;
  margin-bottom: 10px;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.sdk .name { font-size: 1.45rem; font-weight: 700; letter-spacing: -0.01em; }
.sdk .platforms { color: var(--muted); font-size: 0.95rem; }
.sdk .go { margin-top: auto; padding-top: 14px; color: var(--green); font-size: 0.95rem; font-weight: 600; white-space: nowrap; }
.sdk.ready {
  border-color: var(--green);
  background: linear-gradient(160deg, var(--ready-glow), var(--raise) 60%);
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.sdk.ready:hover { border-color: var(--mint); color: var(--text); }
@media (hover: hover) { .sdk.ready:hover { transform: translateY(-2px); } }
.sdk.ready .state { background: var(--green); color: var(--bg); }
.sdk.soon .state { border: 1px solid var(--line-strong); color: var(--muted); }
@media (prefers-reduced-motion: reduce) { .sdk.ready { transition: none; } .sdk.ready:hover { transform: none; } }

/* Footer */
footer {
  padding: 28px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
}
footer p { margin: 0 0 8px; }

/* Not found */
.missing { padding: 90px 0 120px; }
.missing h1 { font-size: clamp(2rem, 4vw, 3rem); }

/* Large screens: a wider column and slightly larger text */
@media (min-width: 1600px) {
  body { font-size: 18px; }
  .wrap { width: min(1240px, 100% - 80px); }
}

/* Below five cards' width: Flutter across the row, the others as compact rows */
@media (max-width: 1119px) {
  .grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .sdk { min-height: 0; }
  .sdk.ready { grid-column: 1 / -1; }
  .sdk.soon {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas: "name state" "platforms state";
    align-items: center;
    column-gap: 12px;
    row-gap: 2px;
    padding: 16px 18px;
  }
  .sdk.soon .name { grid-area: name; font-size: 1.2rem; }
  .sdk.soon .platforms { grid-area: platforms; }
  .sdk.soon .state { grid-area: state; margin: 0; }
}

@media (max-width: 860px) {
  .steps { grid-template-columns: 1fr; }
}

/* Phones and small tablets held upright: the headline first, the drawing on its right */
@media (max-width: 719px) {
  .hero {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "eyebrow art"
      "title   art"
      "tagline tagline"
      "actions actions";
    align-items: start;
    gap: 0 16px;
    min-height: calc(100vh - 96px);
    min-height: calc(100svh - 96px);
    padding: 16px 0 32px;
  }
  .hero h1 { font-size: clamp(2.1rem, 9.6vw, 2.9rem); }
  .tagline { margin: 22px 0 32px; margin: clamp(16px, 3.5svh, 32px) 0 clamp(24px, 5svh, 44px); font-size: clamp(1.3rem, 6vw, 1.6rem); }
  .intro { padding: 40px 0 36px; }
  .hero-text { display: contents; }
  .eyebrow { grid-area: eyebrow; }
  .hero h1 { grid-area: title; }
  .tagline { grid-area: tagline; }
  .actions { grid-area: actions; }
  .phone { grid-area: art; align-self: center; justify-self: end; width: clamp(84px, 26vw, 150px); max-width: none; }
  .grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .actions .btn { flex: 1 1 100%; text-align: center; }
}

@media (max-width: 359px) {
  .hero h1 { font-size: 2rem; }
}

/* The narrowest screens, such as a folded phone's outer screen */
@media (max-width: 339px) {
  .hero { column-gap: 12px; }
  .hero h1 { font-size: 1.75rem; }
  .phone { width: 56px; }
  .sdk.soon { grid-template-columns: 1fr; grid-template-areas: "state" "name" "platforms"; }
  .sdk.soon .state { justify-self: start; margin-bottom: 6px; }
}

/* Documentation pages */
nav a[aria-current="page"] { color: var(--green); }
.doc { padding: 30px 0 70px; }
.doc-head { max-width: 840px; margin-bottom: 30px; }
.doc-head h1 { margin-bottom: 10px; font-size: clamp(2.2rem, 4.6vw, 3.4rem); }
.doc-head .tagline { margin: 0; color: var(--muted); font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 600; }
.doc-grid { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 48px; align-items: start; }
.toc-side {
  position: sticky;
  top: 18px;
  max-height: calc(100vh - 36px);
  overflow-y: auto;
  padding: 4px 8px 4px 0;
  font-size: 0.92rem;
}
.toc-mobile { display: none; }
.toc, .toc ul { list-style: none; margin: 0; padding: 0; }
.toc > li { margin: 0 0 4px; }
.toc a { display: inline-block; padding: 3px 0; color: var(--muted); text-decoration: none; }
.toc a:hover { color: var(--mint); }
.toc code { font-size: inherit; }
.toc .toc-sub { margin: 2px 0 8px 2px; padding-left: 12px; border-left: 1px solid var(--line); }
.toc-sub a { font-size: 0.88rem; }
.toc .toc-probes { display: flex; flex-wrap: wrap; gap: 5px 6px; margin: 6px 0 12px; }
.toc-probes a { padding: 1px 8px; border: 1px solid var(--line); border-radius: 999px; font-size: 0.8rem; }
.toc-probes a:hover { border-color: var(--green); }

.prose { min-width: 0; max-width: 840px; }
.prose > :first-child { margin-top: 0; }
.prose h2 {
  margin: 2.2em 0 0.6em;
  padding-top: 1.1em;
  border-top: 1px solid var(--line);
  font-size: clamp(1.45rem, 2.4vw, 1.8rem);
  letter-spacing: -0.015em;
  scroll-margin-top: 14px;
}
.prose h3 { margin: 1.9em 0 0.5em; font-size: 1.2rem; scroll-margin-top: 14px; }
.prose h2 + h3 { margin-top: 1em; }
.prose p, .prose li { color: var(--prose); }
.prose strong { color: var(--text); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: 0.25em 0; }
.prose hr { display: none; }
.prose code {
  padding: 0.08em 0.35em;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--tint-soft);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.86em;
  overflow-wrap: anywhere;
}
.prose pre {
  margin: 1.2em 0;
  padding: 16px 18px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--code-bg);
  color: var(--code-text);
  font-size: 0.86rem;
  line-height: 1.5;
}
.prose pre code { padding: 0; border: 0; background: none; font-size: inherit; overflow-wrap: normal; }
.prose pre .k, .prose pre .kn, .prose pre .kd, .prose pre .kc, .prose pre .ow { color: var(--code-key); }
.prose pre .nf, .prose pre .nc { color: var(--code-fn); font-weight: 600; }
.prose pre .nb, .prose pre .bp { color: var(--code-builtin); }
.prose pre .s, .prose pre .s1, .prose pre .s2, .prose pre .sd, .prose pre .si, .prose pre .se, .prose pre .sa { color: var(--code-str); }
.prose pre .c, .prose pre .c1, .prose pre .cm, .prose pre .ch { color: var(--code-comment); font-style: italic; }
.prose pre .mi, .prose pre .mf, .prose pre .mh { color: var(--code-num); }
.prose pre .o { color: var(--code-op); }
.table-wrap { margin: 1.2em 0; overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.prose th, .prose td { padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.prose th { background: var(--raise-2); color: var(--text); font-weight: 700; white-space: nowrap; }
.prose td { color: var(--prose); }
.prose td:first-child code { white-space: nowrap; }
.prose tr:last-child td { border-bottom: 0; }
.back { margin-top: 3em; font-size: 0.95rem; }

@media (max-width: 1099px) {
  .doc-grid { grid-template-columns: minmax(0, 1fr); }
  .toc-side { display: none; }
  .toc-mobile { display: block; margin: 0 0 26px; border: 1px solid var(--line); border-radius: 14px; background: var(--raise); }
  .toc-mobile summary { padding: 14px 18px; color: var(--text); font-weight: 600; cursor: pointer; }
  .toc-mobile .toc { max-height: 65vh; padding: 0 18px 16px; overflow-y: auto; }
}
@media (max-width: 480px) {
  .prose table { font-size: 0.85rem; }
  .prose pre { font-size: 0.8rem; }
}

/* The light/dark switch in the header. Hidden until theme.js runs: without it, it would do nothing. */
.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin: -4px 0;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.theme-toggle[hidden] { display: none; }
.theme-toggle:hover { border-color: var(--green); color: var(--green); }
.theme-toggle:focus-visible { outline: 3px solid var(--green); outline-offset: 3px; }
.theme-toggle svg { width: 20px; height: 20px; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }
@media (max-width: 619px) {
  .theme-toggle { order: 1; margin-left: auto; }
  .top nav { order: 2; flex-basis: 100%; margin-left: 0; }
}

/* Light: buttons and cards outlined in green; the drawing on white. */
:root[data-theme="light"] .btn.primary { border: 2px solid #16a34a; background: #f0fdf4; color: #14532d; }
:root[data-theme="light"] .btn.primary:hover { background: #dcfce7; color: #14532d; }
:root[data-theme="light"] .btn.ghost { background: #ffffff; }
:root[data-theme="light"] .sdk.ready { border: 2px solid #16a34a; }
:root[data-theme="light"] .sdk.ready .state { background: #15803d; color: #ffffff; }
:root[data-theme="light"] .phone .ph-body { fill: #ffffff; stroke: #16a34a; }
:root[data-theme="light"] .phone .ph-screen { fill: #f0fdf4; stroke: #86efac; }
:root[data-theme="light"] .phone .ph-speaker { fill: #86efac; }
:root[data-theme="light"] .phone .ph-bars { filter: brightness(0.85) saturate(1.4); }
:root[data-theme="light"] .phone .ph-gap { fill: #ffffff; }
:root[data-theme="light"] .phone .ph-check { stroke: #14532d; }