/* Threebody Tech — shared styles. Tokens and rules: docs/design-language.md */

:root {
  --bg: #ffffff;
  --bg-alt: #f3f5f8;
  --ink: #0f172a;
  --text-2: #475569;
  --muted: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --slate: #334155;
  --accent: #f2a51f;
  --accent-soft: #fef3d7;
  --done: #15803d;
  --done-soft: #dcfce7;
  --review: #b45309;
  --review-soft: #fef3c7;
  --wait: #475569;
  --wait-soft: #eef1f5;
  --radius: 6px;
  --radius-lg: 10px;
  --page: 1120px;
  --gutter: 24px;
  --section: 96px;
  --font: "Instrument Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-underline-offset: 3px; }

h1, h2, h3, p { margin: 0; }

h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 600;
  text-wrap: balance;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
  text-wrap: balance;
}

h3 { font-size: 1.125rem; line-height: 1.3; font-weight: 600; }

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

.section { padding: var(--section) 0; }
.section--alt { background: var(--bg-alt); }
.section--tight { padding: 56px 0; }

.lead { font-size: 1.25rem; line-height: 1.5; color: var(--text-2); max-width: 58ch; }
.muted { color: var(--text-2); }
.small { font-size: 0.9375rem; }

.section-head { max-width: 62ch; margin-bottom: 48px; }
.section-head p { margin-top: 16px; color: var(--text-2); }

.kicker {
  display: inline-block;
  margin-bottom: 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-2);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 2px;
}

/* Skip link and focus */
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: var(--ink); color: #fff; padding: 8px 12px; border-radius: var(--radius); z-index: 10; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 3px; }

/* Header */
.site-header { border-bottom: 1px solid var(--border); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 24px; }

.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-size: 1.125rem; letter-spacing: -0.01em; white-space: nowrap; }
.brand svg { width: 28px; height: 28px; flex: none; }
.brand b { font-weight: 600; }
.brand span { color: var(--text-2); }

.nav { display: flex; align-items: center; gap: 28px; }
.nav a:not(.btn) { text-decoration: none; font-size: 0.9375rem; font-weight: 500; color: var(--text-2); }
.nav a:not(.btn):hover, .nav a[aria-current="page"] { color: var(--ink); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 18px;
  border-radius: var(--radius); border: 1px solid var(--ink);
  background: var(--ink); color: #fff;
  font: inherit; font-size: 0.9375rem; font-weight: 600; text-decoration: none; white-space: nowrap;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}
.btn:hover { background: #1e293b; border-color: #1e293b; }
.btn--secondary { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn--secondary:hover { background: var(--bg-alt); border-color: var(--ink); }
.btn--small { min-height: 38px; padding: 0 14px; }
.btn--light { background: #fff; color: var(--ink); border-color: #fff; }
.btn--light:hover { background: #e2e8f0; border-color: #e2e8f0; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

/* Hero */
.hero { padding: 88px 0 80px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 56px; align-items: center; }
.hero .lead { margin-top: 24px; }
.hero-art { justify-self: end; width: 100%; max-width: 420px; }

.orbit .path { fill: none; stroke: var(--border-strong); stroke-width: 1; }
.orbit .body-a, .orbit .body-b { fill: var(--ink); }
.orbit .body-c { fill: var(--accent); }
.orbit .spin { transform-origin: 210px 210px; animation: spin 90s linear infinite; }
.orbit .spin--b { animation-duration: 140s; animation-direction: reverse; }
.orbit .spin--c { animation-duration: 60s; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Fact strip */
.facts { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.facts ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); }
.facts li { padding: 28px 28px 28px 0; }
.facts li + li { border-left: 1px solid var(--border); padding-left: 28px; }
.facts strong { display: block; font-weight: 600; }
.facts span { display: block; margin-top: 4px; color: var(--text-2); font-size: 0.9375rem; }

/* Columns */
.cols-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.cols-3 > div { border-top: 2px solid var(--ink); padding-top: 20px; }
.cols-3 p { margin-top: 10px; color: var(--text-2); }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; }
.card p { margin-top: 8px; color: var(--text-2); }
.card ul { margin: 16px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--border); }
.card li { padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 0.9375rem; }
.card li:last-child { border-bottom: 0; padding-bottom: 0; }
.card .limit { margin-top: 16px; padding: 10px 12px; background: var(--accent-soft); border-radius: var(--radius); font-size: 0.875rem; color: #6b4a06; }

/* Rows: term left, explanation right */
.rows { border-top: 1px solid var(--border-strong); }
.row { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.6fr) auto; gap: 32px; padding: 22px 0; border-bottom: 1px solid var(--border); align-items: start; }
.row--two { grid-template-columns: minmax(0, 0.8fr) minmax(0, 2fr); }
.row dt, .row .term { font-weight: 600; }
.row dd, .row .desc { margin: 0; color: var(--text-2); }
dl.rows { margin: 0; }

/* Status tags */
.tag { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 0.8125rem; font-weight: 600; line-height: 1.5; white-space: nowrap; }
.tag--done { background: var(--done-soft); color: var(--done); }
.tag--review { background: var(--review-soft); color: var(--review); }
.tag--wait { background: var(--wait-soft); color: var(--wait); }
.tag--who { background: transparent; border: 1px solid var(--border-strong); color: var(--text-2); font-weight: 500; }

/* Product feature block on the company page */
.product { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.product-mark { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.product-mark svg { width: 44px; height: 44px; }
.product-mark span { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.02em; }
.checks { list-style: none; margin: 24px 0 0; padding: 0; }
.checks li { position: relative; padding: 8px 0 8px 22px; color: var(--text-2); }
.checks li::before { content: ""; position: absolute; left: 0; top: 18px; width: 10px; height: 2px; background: var(--accent); }
.checks b { color: var(--ink); font-weight: 600; }

/* Illustration panel (drawn UI, fictional data) */
.panel { background: var(--bg); border: 1px solid var(--border-strong); border-radius: var(--radius-lg); box-shadow: 0 18px 40px -24px rgba(15, 23, 42, 0.35); overflow: hidden; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.panel-head strong { font-size: 0.9375rem; }
.panel-head span { font-size: 0.8125rem; color: var(--muted); }
.steps { list-style: none; margin: 0; padding: 0; }
.steps li { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 10px; align-items: center; padding: 12px 18px; border-bottom: 1px solid var(--border); font-size: 0.9375rem; }
.steps li:last-child { border-bottom: 0; }
.steps li.is-wait { color: var(--muted); }
.caption { margin-top: 12px; font-size: 0.8125rem; color: var(--muted); }

/* Flow: who does what */
.flow { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--border-strong); }
.flow li { position: relative; padding: 0 0 28px 28px; }
.flow li:last-child { padding-bottom: 0; }
.flow li::before { content: ""; position: absolute; left: -7px; top: 8px; width: 12px; height: 12px; border-radius: 50%; background: var(--bg-alt); border: 2px solid var(--ink); }
.flow li.is-person::before { background: var(--accent); border-color: var(--accent); }
.flow h3 { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.flow p { margin-top: 6px; color: var(--text-2); max-width: 60ch; }
.flow-grid { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 56px; align-items: start; }
.flow-grid .section-head { margin-bottom: 0; position: sticky; top: 100px; }
.legend { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 24px; font-size: 0.875rem; color: var(--text-2); }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 50%; margin-right: 8px; vertical-align: -1px; border: 2px solid var(--ink); background: var(--bg-alt); }
.legend i.person { background: var(--accent); border-color: var(--accent); }

/* Deployment diagram */
.diagram { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) minmax(0, 1fr); gap: 0; align-items: stretch; }
.diagram-col { display: flex; flex-direction: column; gap: 12px; justify-content: center; }
.node { border: 1px solid var(--border-strong); border-radius: var(--radius-lg); background: var(--bg); padding: 16px 18px; }
.node strong { display: block; font-size: 0.9375rem; }
.node span { display: block; margin-top: 2px; font-size: 0.875rem; color: var(--text-2); }
.node--core { border: 2px solid var(--ink); padding: 24px 22px; }
.node--core strong { font-size: 1.0625rem; }
.diagram-mid { display: flex; flex-direction: column; justify-content: center; gap: 12px; padding: 0 36px; position: relative; }
.diagram-mid::before, .diagram-mid::after { content: ""; position: absolute; top: 50%; width: 36px; height: 1px; background: var(--border-strong); }
.diagram-mid::before { left: 0; }
.diagram-mid::after { right: 0; }
.diagram-label { font-size: 0.8125rem; font-weight: 600; color: var(--muted); margin-bottom: 4px; }

/* Dark band */
.band { background: var(--ink); color: #fff; padding: 80px 0; }
.band .wrap { display: grid; grid-template-columns: minmax(0, 1.4fr) auto; gap: 40px; align-items: center; }
.band p { margin-top: 14px; color: #cbd5e1; max-width: 56ch; }
.band .actions { margin-top: 0; }

/* Footer */
.site-footer { padding: 40px 0; border-top: 1px solid var(--border); font-size: 0.9375rem; color: var(--text-2); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 32px; align-items: center; }
.site-footer nav { display: flex; gap: 24px; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--ink); text-decoration: underline; }

/* Responsive */
@media (max-width: 900px) {
  :root { --section: 72px; }
  .hero { padding: 56px 0 56px; }
  .hero-grid, .product, .flow-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .hero-art { justify-self: start; max-width: 280px; }
  .hero-art.orbit { display: none; }
  .flow-grid .section-head { position: static; }
  .cols-3 { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .facts ul { grid-template-columns: minmax(0, 1fr); }
  .facts li { padding: 18px 0; }
  .facts li + li { border-left: 0; border-top: 1px solid var(--border); padding-left: 0; }
  .diagram { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .diagram-mid { padding: 0; }
  .diagram-mid::before, .diagram-mid::after { display: none; }
  .band .wrap { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  :root { --gutter: 16px; --section: 64px; }
  body { font-size: 1rem; }
  .lead { font-size: 1.125rem; }
  .nav a:not(.btn) { display: none; }
  .cards { grid-template-columns: minmax(0, 1fr); }
  .card { padding: 22px; }
  .row, .row--two { grid-template-columns: minmax(0, 1fr); gap: 6px; padding: 18px 0; }
  .row .tag { justify-self: start; margin-top: 4px; }
  .steps li { grid-template-columns: minmax(0, 1fr) auto; }
  .steps li .tag--who { display: none; }
  .band { padding: 56px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orbit .spin { animation: none; }
  .btn { transition: none; }
}