/* TerraFlow public microsite. One shared stylesheet for /, /docs/api.html and /docs/install.html.
   Palette and type follow the customer deck: navy #12233D, paper #F6F5F1, teal #0E7C66, mint #5FD3B5,
   orange #B4501A; Source Serif 4 headings, IBM Plex Sans body, IBM Plex Mono numbers and code.
   No JavaScript anywhere: theme follows prefers-color-scheme. */

:root {
  --navy: #12233D;
  --paper: #F6F5F1;
  --teal: #0E7C66;
  --mint: #5FD3B5;
  --orange: #B4501A;

  --bg: var(--paper);
  --bg-raised: #FFFFFF;
  --bg-sunk: #ECEAE3;
  --ink: #12233D;
  --ink-soft: #3C4A5E;
  --ink-mute: #5D6878;
  --rule: #DDD9CE;
  --accent: var(--teal);
  --accent-ink: #FFFFFF;
  --accent-soft: #DDEFE9;
  --warn: var(--orange);
  --hero-bg: var(--navy);
  --hero-ink: #F6F5F1;
  --hero-mute: #B9C3D1;
  --code-bg: #12233D;
  --code-ink: #E9EEF5;
  --code-mute: #9FB0C6;

  /* chart tokens */
  --c-grid: #DDD9CE;
  --c-axis: #5D6878;
  --c-dot: #B8B3A6;
  --c-ref: #12233D;
  --c-tf: #0E7C66;
  --c-rival: #B4501A;
  --c-halo: #F6F5F1;

  --serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 6px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0D1829;
    --bg-raised: #14223A;
    --bg-sunk: #0A1322;
    --ink: #ECEAE3;
    --ink-soft: #C6CDD8;
    --ink-mute: #98A3B4;
    --rule: #26364F;
    --accent: #5FD3B5;
    --accent-ink: #0D1829;
    --accent-soft: #143A36;
    --warn: #E58A55;
    --hero-bg: #0A1322;
    --hero-ink: #F6F5F1;
    --hero-mute: #A9B5C6;
    --code-bg: #08101D;
    --code-ink: #E9EEF5;
    --code-mute: #8EA0B8;
    --c-grid: #26364F;
    --c-axis: #98A3B4;
    --c-dot: #5B677A;
    --c-ref: #ECEAE3;
    --c-tf: #5FD3B5;
    --c-rival: #E58A55;
    --c-halo: #0D1829;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0D1829; --bg-raised: #14223A; --bg-sunk: #0A1322; --ink: #ECEAE3; --ink-soft: #C6CDD8; --ink-mute: #98A3B4;
  --rule: #26364F; --accent: #5FD3B5; --accent-ink: #0D1829; --accent-soft: #143A36; --warn: #E58A55;
  --hero-bg: #0A1322; --hero-ink: #F6F5F1; --hero-mute: #A9B5C6; --code-bg: #08101D; --code-ink: #E9EEF5;
  --code-mute: #8EA0B8; --c-grid: #26364F; --c-axis: #98A3B4; --c-dot: #5B677A; --c-ref: #ECEAE3; --c-tf: #5FD3B5;
  --c-rival: #E58A55; --c-halo: #0D1829; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--mint); outline-offset: 3px; border-radius: 2px; }

.skip { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--bg-raised); color: var(--ink);
        padding: 8px 14px; border-radius: var(--radius); }
.skip:focus { left: 16px; }

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

h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; line-height: 1.15; margin: 0 0 .5em; }
h1 { font-size: clamp(2.3rem, 5.4vw, 4.1rem); }
h2 { font-size: clamp(1.75rem, 3.4vw, 2.6rem); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; }
.num, .mono { font-family: var(--mono); font-weight: 500; }
.eyebrow { font: 600 .78rem/1.2 var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--accent);
           margin: 0 0 14px; }
.lede { font-size: 1.2rem; color: var(--ink-soft); max-width: 46em; }
.muted { color: var(--ink-mute); }
.small { font-size: .88rem; }

/* header */
.top { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 92%, transparent);
       backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid var(--rule); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none;
         font: 600 1.25rem/1 var(--serif); }
.brand svg { width: 26px; height: 26px; flex: none; }
.nav { display: flex; align-items: center; gap: 22px; }
.nav a { color: var(--ink-soft); text-decoration: none; font-size: .95rem; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; }
.nav .btn { color: var(--accent-ink); text-decoration: none; }
@media (max-width: 760px) { .nav .hide-sm { display: none; } .nav { gap: 14px; } }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px;
       padding: 10px 20px; border-radius: var(--radius); font: 600 1rem/1.2 var(--sans); text-decoration: none;
       border: 1.5px solid transparent; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { border-color: currentColor; color: inherit; }
.btn-sm { min-height: 38px; padding: 7px 16px; font-size: .92rem; }

/* hero */
.hero { background: var(--hero-bg); color: var(--hero-ink); padding: clamp(56px, 9vw, 120px) 0 clamp(48px, 7vw, 96px);
        position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0;
                background: radial-gradient(60% 80% at 85% 10%, rgba(95,211,181,.16), transparent 60%),
                            linear-gradient(transparent 0 calc(100% - 1px), rgba(255,255,255,.06) 0) 0 0 / 100% 48px;
                pointer-events: none; }
.hero .wrap { position: relative; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 56px;
              align-items: center; }
.hero h1 { color: var(--hero-ink); max-width: 13em; }
.hero h1 em { font-style: normal; color: var(--mint); }
.hero .eyebrow { color: var(--mint); }
.hero .lede { color: var(--hero-mute); }
.hero .cta { display: flex; flex-wrap: wrap; gap: 14px; margin: 30px 0 22px; }
.hero .btn-primary { background: var(--mint); color: var(--navy); }
.hero .btn-ghost { color: var(--hero-ink); }
.hero .fine { color: var(--hero-mute); font-size: .9rem; margin: 0; }
.hero .fine a { color: var(--mint); }
.pathcard { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.12); border-radius: 10px;
            padding: 22px 22px 14px; }
.pathcard h2 { font: 600 .78rem/1.2 var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--hero-mute);
               margin: 0 0 14px; }
.pathcard ol { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.pathcard li { counter-increment: s; display: grid; grid-template-columns: 34px 1fr; gap: 10px; padding: 9px 0;
               border-top: 1px solid rgba(255,255,255,.08); font-size: .95rem; color: var(--hero-ink); }
.pathcard li:first-child { border-top: 0; }
.pathcard li::before { content: counter(s, decimal-leading-zero); font: 500 .8rem/1.9 var(--mono); color: var(--mint); }
.pathcard li span { display: block; color: var(--hero-mute); font-size: .84rem; }
.pathcard .gate { color: var(--mint); font-weight: 600; }
@media (max-width: 900px) { .hero .wrap { grid-template-columns: 1fr; gap: 40px; } }

/* sections */
section { padding: clamp(64px, 8vw, 112px) 0; border-bottom: 1px solid var(--rule); }
section.alt { background: var(--bg-sunk); }
.section-head { max-width: 760px; margin-bottom: 44px; }

.grid { display: grid; gap: 24px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1000px) { .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 760px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } }

.card { background: var(--bg-raised); border: 1px solid var(--rule); border-radius: 10px; padding: 26px; }
.card h3 { margin-bottom: .4em; }
.card p:last-child { margin-bottom: 0; }

.pain { border-top: 3px solid var(--warn); }
.pain .big { font: 600 2.2rem/1 var(--serif); color: var(--warn); margin-bottom: 12px; }

.steps { list-style: none; margin: 0; padding: 0; counter-reset: st; }
.steps > li { counter-increment: st; position: relative; padding: 26px 26px 26px 26px; background: var(--bg-raised);
              border: 1px solid var(--rule); border-radius: 10px; }
.steps > li::before { content: counter(st); display: inline-grid; place-items: center; width: 36px; height: 36px;
                      border-radius: 50%; background: var(--accent-soft); color: var(--accent);
                      font: 600 1rem/1 var(--mono); margin-bottom: 14px; }
.steps h3 { font-size: 1.2rem; }
.steps p { color: var(--ink-soft); margin: 0; font-size: .97rem; }

.boundary { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--rule);
            border-radius: 10px; overflow: hidden; background: var(--bg-raised); }
.boundary > div { padding: 26px; border-left: 1px solid var(--rule); }
.boundary > div:first-child { border-left: 0; }
.boundary h3 { font-size: 1.15rem; display: flex; align-items: center; gap: 10px; }
.boundary h3 i { width: 12px; height: 12px; border-radius: 50%; display: inline-block; flex: none; }
.boundary ul { margin: 0; padding-left: 1.1em; color: var(--ink-soft); }
.boundary li { margin: 4px 0; }
@media (max-width: 860px) { .boundary { grid-template-columns: 1fr; }
  .boundary > div { border-left: 0; border-top: 1px solid var(--rule); } .boundary > div:first-child { border-top: 0; } }

/* proof */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; margin-bottom: 48px; }
@media (max-width: 860px) { .stats { grid-template-columns: 1fr; } }
.stat { border-top: 3px solid var(--accent); padding-top: 18px; }
.stat .figure { font: 600 clamp(2.4rem, 5vw, 3.4rem)/1 var(--mono); color: var(--accent); letter-spacing: -0.02em; }
.stat .what { font: 600 1.08rem/1.35 var(--sans); margin: 10px 0 6px; }
.stat .src { font-size: .84rem; color: var(--ink-mute); margin: 0; }
.tag { display: inline-block; font: 600 .7rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase;
       padding: 5px 8px; border-radius: 4px; background: var(--accent-soft); color: var(--accent); margin-bottom: 8px; }

.chartrow { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); gap: 32px; align-items: start;
            margin: 0 0 56px; }
.chartrow > *, .grid > *, .hero .wrap > * { min-width: 0; }
@media (max-width: 980px) { .chartrow { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .chart { padding: 10px 6px 6px; } }
figure { margin: 0; }
.chart { background: var(--bg-raised); border: 1px solid var(--rule); border-radius: 10px; padding: 18px 18px 10px; }
.chart svg { display: block; width: 100%; height: auto; }
.chart figcaption { font-size: .84rem; color: var(--ink-mute); padding: 8px 4px 4px; }
.chart .grid-l { stroke: var(--c-grid); stroke-width: 1.5; }
.chart .grid-v { stroke: var(--c-grid); stroke-dasharray: 3 6; }
.chart .axis { fill: var(--c-axis); font-size: 22px; }
.chart .axis-t { fill: var(--c-axis); font-size: 22px; }
.chart .dot { fill: var(--c-dot); }
.chart .dot-l { fill: var(--c-axis); font-size: 21px; }
.chart .ref { fill: var(--c-ref); }
.chart .ref-l { fill: var(--c-ref); font-size: 22px; font-weight: 600; }
.chart .tf-line { fill: none; stroke: var(--c-tf); stroke-width: 5; stroke-linejoin: round; }
.chart .tf { fill: var(--c-tf); stroke: var(--c-halo); stroke-width: 3; }
.chart .tf-l { fill: var(--c-tf); font-size: 22px; font-weight: 600; }
.chart .tf-h { fill: var(--c-tf); font-size: 24px; font-weight: 700; }
.chart .rival { fill: var(--c-rival); }
.chart .rival-l { fill: var(--c-rival); font-size: 22px; font-weight: 600; }
.chart text { font-family: var(--sans); }

table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 600; color: var(--ink-soft); font-size: .82rem; letter-spacing: .04em; text-transform: uppercase; }
td.n, th.n { text-align: right; font-family: var(--mono); white-space: nowrap; }
tr.hl td { background: var(--accent-soft); }
tr.hl td:first-child { font-weight: 600; }
.tablewrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--rule); border-radius: 10px;
             background: var(--bg-raised); }
.tablewrap table { min-width: 420px; }
.tablewrap th:first-child, .tablewrap td:first-child { padding-left: 16px; }

.checks { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px 24px; }
.checks li { display: flex; gap: 10px; align-items: baseline; }
.checks li::before { content: "✓"; color: var(--accent); font-weight: 700; }
@media (max-width: 760px) { .checks { grid-template-columns: 1fr; } }

.team h3 { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.team .who { font: 500 .8rem/1 var(--mono); color: var(--ink-mute); }
.team ul { margin: 0; padding-left: 1.1em; color: var(--ink-soft); }
.team li { margin: 6px 0; }

.start { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0;
         border-top: 2px solid var(--ink); }
.start li { padding: 22px 22px 0 0; }
.start .k { font: 500 .82rem/1 var(--mono); color: var(--accent); }
.start h3 { margin: 10px 0 8px; font-size: 1.25rem; }
.start p { color: var(--ink-soft); font-size: .97rem; }
@media (max-width: 1000px) { .start { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .start { grid-template-columns: 1fr; } }

.closing { background: var(--hero-bg); color: var(--hero-ink); border-bottom: 0; }
.closing h2 { color: var(--hero-ink); }
.closing p { color: var(--hero-mute); }
.closing .btn-primary { background: var(--mint); color: var(--navy); }
.closing .btn-ghost { color: var(--hero-ink); }
.closing .cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 24px; }

footer.foot { background: var(--bg-sunk); padding: 48px 0 40px; font-size: .92rem; color: var(--ink-mute); }
.foot .cols { display: grid; grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr)); gap: 28px; }
.foot h2 { font: 600 .78rem/1.2 var(--sans); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); margin: 0 0 12px; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin: 6px 0; }
.foot a { color: var(--ink-soft); }
.foot .legal { margin-top: 32px; padding-top: 18px; border-top: 1px solid var(--rule); font-size: .84rem; }
@media (max-width: 760px) { .foot .cols { grid-template-columns: 1fr 1fr; } .foot .cols > div:first-child { grid-column: 1 / -1; } }

/* docs pages */
.doc { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 56px; padding-top: 48px; padding-bottom: 96px; }
.toc { position: sticky; top: 88px; align-self: start; font-size: .92rem; }
.toc h2 { font: 600 .74rem/1.2 var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-mute); margin: 0 0 10px; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule); }
.toc li a { display: block; padding: 5px 0 5px 14px; color: var(--ink-soft); text-decoration: none; }
.toc li a:hover { color: var(--accent); }
@media (max-width: 900px) { .doc { grid-template-columns: 1fr; gap: 24px; } .toc { position: static; }
  .toc ol { columns: 2; column-gap: 20px; } }
@media (max-width: 480px) { .toc ol { columns: 1; } }
.prose { min-width: 0; max-width: 820px; }
.prose h1 { font-size: clamp(2.1rem, 4.4vw, 3rem); }
.prose h2 { font-size: 1.7rem; margin-top: 2.2em; padding-top: .6em; border-top: 1px solid var(--rule); scroll-margin-top: 84px; }
.prose h3 { font-size: 1.2rem; margin-top: 1.8em; scroll-margin-top: 84px; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: 6px 0; }
.prose table { margin: 0 0 1.4em; }
.prose .tablewrap { margin: 0 0 1.4em; }
.prose .tablewrap table { margin: 0; }
code { font-family: var(--mono); font-size: .88em; background: var(--bg-sunk); padding: 1px 5px; border-radius: 4px;
       overflow-wrap: anywhere; }
pre { background: var(--code-bg); color: var(--code-ink); border-radius: 8px; padding: 18px 20px; overflow-x: auto;
      font: 400 .86rem/1.6 var(--mono); margin: 0 0 1.4em; -webkit-overflow-scrolling: touch; }
pre code { background: none; padding: 0; font-size: inherit; color: inherit; overflow-wrap: normal; }
pre .c { color: var(--code-mute); }
.codehead { display: flex; justify-content: space-between; font: 600 .74rem/1 var(--sans); letter-spacing: .1em;
            text-transform: uppercase; color: var(--ink-mute); margin: 0 0 8px; }
.note { border-left: 3px solid var(--accent); background: var(--accent-soft); padding: 14px 18px; border-radius: 0 8px 8px 0;
        margin: 0 0 1.4em; }
.note.warn { border-left-color: var(--warn); background: color-mix(in srgb, var(--warn) 12%, var(--bg)); }
.note p:last-child { margin: 0; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; margin: 0 0 1.4em; }
.kv dt { font-family: var(--mono); font-size: .88rem; color: var(--ink); }
.kv dd { margin: 0; color: var(--ink-soft); }
@media (max-width: 560px) { .kv { grid-template-columns: 1fr; } .kv dd { margin-bottom: 10px; } }
.docs-hero { background: var(--hero-bg); color: var(--hero-ink); padding: 40px 0 36px; }
.docs-hero p { color: var(--hero-mute); margin: 0; max-width: 52em; }
.docs-hero h1 { color: var(--hero-ink); font-size: clamp(2rem, 4.2vw, 2.9rem); margin-bottom: .3em; }
.docs-hero .eyebrow { color: var(--mint); }