/* OceanKB — one stylesheet, no external resources (the CSP allows only 'self'). Light and dark themes follow the
   system; the ◐ button overrides it (stored in localStorage "okb_theme"). */
:root {
  --bg: #f6f8fb; --bg2: #ffffff; --band: #eef3f8; --ink: #0d1b2a; --mut: #4b5b6e; --line: #d9e1ea;
  --a: #12a99c; --a2: #2a6df4; --a-ink: #ffffff; --code: #0b1d33; --code-ink: #d6e4f5;
  --shadow: 0 1px 2px rgba(13, 27, 42, .06), 0 8px 24px rgba(13, 27, 42, .06);
  --radius: 16px; --max: 1120px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #07131f; --bg2: #0d1d2e; --band: #0a1826; --ink: #e6eef7; --mut: #9fb2c6; --line: #1d3247;
    --a: #2fd1c2; --a2: #6a9bff; --a-ink: #04121c; --code: #040d16; --code-ink: #cfe0f3;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #07131f; --bg2: #0d1d2e; --band: #0a1826; --ink: #e6eef7; --mut: #9fb2c6; --line: #1d3247;
  --a: #2fd1c2; --a2: #6a9bff; --a-ink: #04121c; --code: #040d16; --code-ink: #cfe0f3;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--a2); text-decoration-thickness: 1px; text-underline-offset: 3px; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2.3rem, 5.5vw, 4rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 750; }
h3 { font-size: 1.12rem; font-weight: 700; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
section { padding: 88px 0; scroll-margin-top: 64px; }
.band { background: var(--band); border-block: 1px solid var(--line); }
.sub { color: var(--mut); font-size: 1.08rem; max-width: 760px; margin-bottom: 36px; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .78rem; font-weight: 700; color: var(--a); margin-bottom: 14px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--bg2); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--a2); outline-offset: 2px; border-radius: 6px; }

/* header */
.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 18px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 800; font-size: 1.15rem; letter-spacing: -.02em; }
.nav { display: flex; gap: 22px; margin-left: auto; }
.nav a { color: var(--mut); text-decoration: none; font-size: .95rem; font-weight: 550; }
.nav a:hover { color: var(--ink); }
.theme { background: none; border: 1px solid var(--line); color: var(--ink); width: 36px; height: 36px; border-radius: 10px; cursor: pointer; font-size: 1rem; }
@media (max-width: 860px) { .nav { display: none; } .theme { margin-left: auto; } }

/* buttons */
.btn { display: inline-block; background: linear-gradient(135deg, var(--a), var(--a2)); color: #fff; text-decoration: none;
  font-weight: 700; padding: 13px 22px; border-radius: 12px; box-shadow: var(--shadow); border: 0; }
.btn:hover { filter: brightness(1.06); }
.btn.small { padding: 8px 14px; font-size: .92rem; }
.btn.big { font-size: 1.15rem; padding: 16px 28px; }
.btn.ghost { background: none; color: var(--ink); border: 1px solid var(--line); box-shadow: none; }
.btn.ghost:hover { border-color: var(--a); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* hero */
.hero { padding: 72px 0 84px; background:
  radial-gradient(900px 420px at 85% 10%, color-mix(in srgb, var(--a2) 14%, transparent), transparent 70%),
  radial-gradient(700px 380px at 5% 90%, color-mix(in srgb, var(--a) 14%, transparent), transparent 70%); }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.lead { font-size: 1.2rem; color: var(--mut); max-width: 620px; }
.graph { margin: 0; }
.graph svg { width: 100%; height: auto; display: block; }
.graph .edges path { stroke: color-mix(in srgb, var(--a2) 55%, var(--line)); stroke-width: 2; fill: none; }
.graph .nodes circle { fill: var(--bg2); stroke: var(--a); stroke-width: 3; }
.graph .checks path { stroke: var(--a); stroke-width: 3; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.graph .tags rect { fill: var(--bg2); stroke: var(--line); }
.graph .tags text { fill: var(--mut); font: 600 13px ui-sans-serif, system-ui, sans-serif; text-anchor: middle; }
@media (max-width: 860px) { .hero-grid { grid-template-columns: 1fr; } .graph { max-width: 460px; } }

/* cards, steps */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 960px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .cards { grid-template-columns: 1fr; } }
.card { background: var(--bg2); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.card p { color: var(--mut); margin: 0; font-size: .98rem; }
.ic { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 14px; font-size: 1.1rem;
  color: var(--a-ink); background: linear-gradient(135deg, var(--a), var(--a2)); }
.steps { list-style: none; padding: 0; margin: 32px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: s; }
@media (max-width: 960px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .steps { grid-template-columns: 1fr; } }
.steps li { display: flex; flex-direction: column; gap: 12px; border-top: 3px solid var(--a); padding-top: 18px; }
.steps .n { font-weight: 800; color: var(--a); font-size: 1.4rem; }
.steps p { color: var(--mut); margin: 0; font-size: .98rem; }

/* agents */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }
.ticks { list-style: none; padding: 0; margin: 0; }
.ticks li { padding-left: 30px; position: relative; margin: 10px 0; }
.ticks li::before { content: "✓"; position: absolute; left: 0; color: var(--a); font-weight: 800; }
.code { margin: 0; background: var(--code); color: var(--code-ink); border-radius: var(--radius); padding: 24px; overflow-x: auto;
  font: 14px/1.75 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; box-shadow: var(--shadow); }
.code .c { color: #6f8aa6; } .code .k { color: #5be3d6; } .code .s { color: #a9c0da; } .code .ok { color: #7ee08f; }

/* case study, about, contact */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin: 8px 0 32px; }
@media (max-width: 860px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stats div { background: var(--bg2); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.stats dt { font-size: 2rem; font-weight: 800; letter-spacing: -.02em;
  background: linear-gradient(135deg, var(--a), var(--a2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stats dd { margin: 4px 0 0; color: var(--mut); font-size: .95rem; }
.facts { background: var(--bg2); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 22px; }
.facts p { display: flex; justify-content: space-between; gap: 16px; margin: 0; padding: 14px 0; border-bottom: 1px solid var(--line); }
.facts p:last-child { border-bottom: 0; }
.facts span { color: var(--mut); }
.contact { text-align: center; }
.contact .sub { margin-inline: auto; }

/* footer */
.foot { border-top: 1px solid var(--line); color: var(--mut); font-size: .92rem; }
.foot .bar { justify-content: space-between; flex-wrap: wrap; padding: 18px 20px; }
.flinks { display: flex; gap: 18px; }
.flinks a { color: var(--mut); }

/* the privacy page */
.doc { max-width: 760px; padding: 56px 20px 88px; }
.doc h1 { font-size: clamp(2rem, 4vw, 2.6rem); }
.doc h2 { font-size: 1.3rem; margin-top: 1.8em; }
.doc .meta { color: var(--mut); }
.doc h1.away { margin-top: 40px; }