/* ===== 1. COLOURS (change here only) ===== */
:root {
  --bg: #ffffff; /* plain page background */
  --card: #f8fafc; /* cards, table, code */
  --ink: #0f172a; /* main text */
  --muted: #475569; /* secondary text */
  --line: #e2e8f0; /* borders */
  --navy: #1e3a5f; /* headings, buttons */
  --teal: #0f766e; /* accent */
  --teal-soft: #e6f4f1;
}
/* ===== 2. BASE ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font:
    17px/1.7 "Inter",
    system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
}
h1,
h2,
h3 {
  font-family: "Inter", system-ui, sans-serif;
  color: var(--navy);
  line-height: 1.2;
  margin: 0 0 0.5em;
}
h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 1.1rem;
  font-weight: 600;
}
.sub {
  margin-top: 40px;
}
p {
  margin: 0 0 1em;
  max-width: 68ch;
}
a {
  color: var(--teal);
}
:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 2px;
}
.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}
section {
  padding: 64px 0;
  border-top: 1px solid var(--line);
}
.code-tag {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 10px;
}
.glow {
  color: var(--teal);
}
/* ===== 3. NAV ===== */
nav.top {
  background: var(--bg);
  padding: 16px 0;
}
nav.top .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  color: var(--navy);
}
.brand span {
  color: var(--teal);
}
nav.top ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.93rem;
}
nav.top a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
}
nav.top a:hover {
  color: var(--navy);
}
/* ===== 4. HERO (centered) ===== */
.hero {
  padding: 72px 0 80px;
  text-align: center;
}
.hero p {
  margin-left: auto;
  margin-right: auto;
}
.lead {
  font-size: 1.18rem;
  color: var(--muted);
}
.btn {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
}
.btn:hover {
  background: #16304e;
}
.btn.ghost {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--line);
  margin-left: 10px;
}
.btn.ghost:hover {
  background: var(--card);
}
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 44px;
  text-align: left;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  color: var(--muted);
  font-size: 0.95rem;
}
.stat b {
  display: block;
  font-size: 1.1rem;
  color: var(--navy);
}
/* ===== 5. CARDS ===== */
.grid,
.two {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}
.grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.two {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
}
.card p {
  margin: 0;
  font-size: 0.96rem;
  color: var(--muted);
}
.card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}
.card li {
  margin-bottom: 0.5em;
}
.tag {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--teal);
  background: var(--teal-soft);
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.callout {
  background: var(--teal-soft);
  border-left: 4px solid var(--teal);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  max-width: 72ch;
}
.callout p {
  margin: 0;
}
/* ===== 6. LOOP + STEPS ===== */
ol.pipe {
  list-style: none;
  counter-reset: p;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px;
  padding: 0;
  margin: 24px 0;
}
ol.pipe li {
  counter-increment: p;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
}
ol.pipe li::before {
  content: "0" counter(p);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--teal);
}
ol.pipe b {
  display: block;
  font-size: 1rem;
  color: var(--navy);
}
ol.pipe span {
  font-size: 0.93rem;
  color: var(--muted);
}
ol.steps {
  list-style: none;
  counter-reset: s;
  padding: 0;
  margin: 24px 0 0;
}
ol.steps li {
  counter-increment: s;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
ol.steps li::before {
  content: counter(s);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  display: grid;
  place-items: center;
}
ol.steps p {
  margin: 0;
  color: var(--muted);
}
ol.steps h3 {
  margin-bottom: 0.3em;
}
/* ===== 7. TABLE, CODE, DL, FAQ ===== */
.scroll {
  overflow-x: auto;
  margin-top: 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
}
table {
  border-collapse: collapse;
  width: 100%;
  min-width: 620px;
  font-size: 0.95rem;
}
th,
td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  font-size: 0.88rem;
}
td:first-child {
  color: var(--navy);
  font-weight: 600;
}
td {
  color: var(--muted);
}
tr:last-child td {
  border-bottom: 0;
}
pre.code {
  background: #0f172a;
  border-radius: 10px;
  padding: 18px;
  overflow-x: auto;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.88rem;
  color: #e2e8f0;
  margin: 18px 0;
}
dl {
  display: grid;
  grid-template-columns: minmax(130px, 210px) 1fr;
  gap: 12px 22px;
  margin: 20px 0 0;
}
dt {
  font-weight: 600;
  color: var(--navy);
}
dd {
  margin: 0;
  color: var(--muted);
}
@media (max-width: 560px) {
  dl {
    grid-template-columns: 1fr;
  }
  dd {
    margin-bottom: 8px;
  }
  .btn.ghost {
    margin: 10px 0 0;
  }
}
details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 10px;
}
details[open] {
  border-color: var(--teal);
}
summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--navy);
}
details p {
  margin: 10px 0 0;
  color: var(--muted);
}
/* ===== 8. FOOTER ===== */
footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 44px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--muted);
}
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}

/* ===== 9. AGENT LOOP ANIMATION (hero) ===== */
.agent {
  display: block;
  width: min(440px, 94%);
  margin: 0 auto 24px;
  overflow: visible;
}
.agent .tl line {
  stroke: var(--teal);
  stroke-width: 1.5;
  stroke-dasharray: 5 5;
  opacity: 0.5;
  animation: agflow 1.4s linear infinite;
}
.agent .chips rect {
  fill: var(--card);
  stroke: var(--line);
  stroke-width: 1.5;
}
.agent .chips text {
  fill: var(--navy);
  font:
    700 8px "JetBrains Mono",
    ui-monospace,
    monospace;
  letter-spacing: 0.06em;
}
.agent .ring {
  fill: none;
  stroke: var(--teal);
  stroke-width: 2;
  opacity: 0.35;
}
.agent .orbit {
  transform-origin: 180px 110px;
  animation: agspin 6s linear infinite;
}
.agent .runner {
  fill: var(--teal);
  filter: drop-shadow(0 0 5px var(--teal));
}
.agent .core {
  fill: var(--teal-soft);
  stroke: var(--teal);
  stroke-width: 3;
}
.agent .coret {
  fill: var(--navy);
  font:
    800 9px "Inter",
    system-ui,
    sans-serif;
  letter-spacing: 0.06em;
}
.agent .stp {
  fill: var(--bg);
  stroke: var(--navy);
  stroke-width: 2.5;
  transform-box: fill-box;
  transform-origin: center;
  animation: agpulse 6s ease-in-out infinite;
}
.agent .s2 {
  animation-delay: 2s;
}
.agent .s3 {
  animation-delay: 4s;
}
.agent .stl {
  fill: var(--navy);
  font:
    700 8.5px "JetBrains Mono",
    ui-monospace,
    monospace;
  letter-spacing: 0.08em;
}
@keyframes agspin {
  to {
    transform: rotate(360deg);
  }
}
@keyframes agflow {
  to {
    stroke-dashoffset: -20;
  }
}
@keyframes agpulse {
  0%,
  22%,
  100% {
    transform: scale(1);
    fill: var(--bg);
  }
  8% {
    transform: scale(1.35);
    fill: var(--teal);
  }
}
@media (prefers-reduced-motion: reduce) {
  .agent .tl line,
  .agent .orbit,
  .agent .stp {
    animation: none !important;
  }
}