/* FabForward Cobot Studio — shared design system (one copy for the whole site). */
:root{
  --bg:#f6f8fb; --surface:#ffffff; --ink:#0f1b2d; --ink-soft:#475569;
  --ink-faint:#7a8aa0; --line:#e3e9f1;
  --brand:#2f6df7; --brand-dark:#1d4ed8; --brand-ink:#0c2a66;
  --accent:#16a34a; --accent-soft:#dcfce7;
  --warn:#b45309; --warn-soft:#fef3c7;
  --bad:#dc2626; --bad-soft:#fee2e2;
  --hero1:#0b1f44; --hero2:#15397e;
  --radius:16px;
  --shadow:0 1px 2px rgba(15,27,45,.06),0 8px 24px rgba(15,27,45,.06);
  --shadow-lg:0 10px 40px rgba(15,27,45,.14);
  --maxw:1080px; --navw:248px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic UI","Meiryo",Roboto,Helvetica,Arial,sans-serif;
  --mono:"SF Mono",ui-monospace,"Cascadia Code","Roboto Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  line-height:1.8;-webkit-font-smoothing:antialiased;}
h1,h2,h3{line-height:1.35;margin:0 0 .5em;letter-spacing:-.01em}
h2{font-size:clamp(1.4rem,3.1vw,2rem);color:var(--ink)}
h3{font-size:1.16rem;color:var(--brand-ink);margin-top:1.4em}
h2 .kick{display:block;font-size:.72rem;font-weight:800;letter-spacing:.12em;
  text-transform:uppercase;color:var(--brand);margin-bottom:.5em}
p{margin:0 0 1em}
a{color:var(--brand-dark)}
strong{color:var(--brand-ink)}
em{font-style:normal;background:linear-gradient(transparent 60%,#bfdbfe 60%);font-weight:700}
code{font-family:var(--mono);font-size:.86em;background:#eef2f8;padding:.1em .4em;border-radius:6px;color:#0b3a8f}
pre{background:#0c1830;color:#dbe7ff;border-radius:12px;padding:16px 18px;overflow-x:auto;
  font-family:var(--mono);font-size:.84rem;line-height:1.6;box-shadow:var(--shadow);margin:14px 0}
pre .c{color:#7f9cc8} pre .k{color:#6fb3ff} pre .s{color:#8ce0a8}
.lead{font-size:1.1rem;color:var(--ink-soft);max-width:68ch}
.note{font-size:.84rem;color:var(--ink-faint)}

/* ---------- app shell: sticky top brand + left nav + content ---------- */
.brandbar{position:sticky;top:0;z-index:40;background:#0c1c3aee;backdrop-filter:blur(8px);
  color:#eaf1ff;border-bottom:1px solid #ffffff1a}
.brandbar .in{max-width:calc(var(--maxw) + var(--navw) + 64px);margin:0 auto;padding:12px 22px;
  display:flex;align-items:center;gap:12px}
.brandbar .logo{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,#2f6df7,#1d4ed8);
  display:grid;place-items:center;color:#fff;font-weight:800;font-size:.8rem}
.brandbar .name{font-weight:800;font-size:.95rem;letter-spacing:.01em}
.brandbar .sub{color:#9ec3ff;font-size:.8rem;margin-left:2px}
.brandbar .menu{margin-left:auto;display:none;background:#ffffff14;border:1px solid #ffffff2a;
  color:#eaf1ff;border-radius:9px;padding:7px 12px;font-weight:700;cursor:pointer;font-family:var(--font)}

.layout{max-width:calc(var(--maxw) + var(--navw) + 64px);margin:0 auto;padding:0 22px;
  display:grid;grid-template-columns:var(--navw) 1fr;gap:32px;align-items:start}
nav.side{position:sticky;top:64px;align-self:start;padding:24px 0;max-height:calc(100vh - 64px);overflow:auto}
nav.side a{display:flex;gap:10px;align-items:baseline;text-decoration:none;color:var(--ink-soft);
  font-weight:600;font-size:.92rem;padding:9px 14px;border-radius:10px;margin-bottom:2px;line-height:1.35}
nav.side a:hover{background:#eef3fb;color:var(--brand-ink)}
nav.side a.active{background:linear-gradient(135deg,#2f6df7,#1d4ed8);color:#fff;box-shadow:var(--shadow)}
nav.side a.active .navnum{color:#cfe0ff}
nav.side .navnum{font-family:var(--mono);font-size:.74rem;color:var(--ink-faint);font-weight:700}
main{min-width:0;padding:8px 0 24px}
section{padding:30px 0}
section:first-child{padding-top:24px}
hr.div{border:none;border-top:1px solid var(--line);margin:0}

/* ---------- hero (per page) ---------- */
.hero{background:radial-gradient(1200px 500px at 80% -10%,#1e4fae33,transparent),
  linear-gradient(160deg,var(--hero1),var(--hero2));color:#eaf1ff;border-radius:var(--radius);
  padding:36px 34px;margin:8px 0 6px;box-shadow:var(--shadow-lg);overflow:hidden}
.hero .tag{display:inline-block;font-size:.72rem;font-weight:800;letter-spacing:.1em;
  text-transform:uppercase;color:#9ec3ff;border:1px solid #ffffff2a;border-radius:999px;
  padding:5px 13px;margin-bottom:16px;background:#ffffff10}
.hero h1{font-size:clamp(1.5rem,3.6vw,2.2rem);color:#fff;max-width:24ch}
.hero p{color:#cfe0ff;font-size:1.06rem;max-width:62ch;margin-bottom:0}
.hero strong{color:#fff}                                   /* readable emphasis on dark blue */
.hero em{background:linear-gradient(transparent 60%,rgba(96,165,250,.55) 60%);color:#fff}
.hero .figimg{margin-top:22px;border-radius:12px;overflow:hidden;border:1px solid #ffffff22}
.hero .figimg img{display:block;width:100%}

/* ---------- cards / grids / figures ---------- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:22px 24px;margin:16px 0}
.grid{display:grid;gap:16px}
.grid.two{grid-template-columns:1fr 1fr}
.grid.three{grid-template-columns:repeat(3,1fr)}

/* ---------- explainer gallery (auto-listed from published/) ---------- */
.xgrid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));margin:18px 0}
.xcard{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 22px;text-decoration:none;color:inherit;
  transition:border-color .15s,box-shadow .15s,transform .15s}
.xcard:hover{border-color:var(--brand);box-shadow:0 8px 24px #1d4ed822;transform:translateY(-2px)}
.xcard h3{margin:0 0 .45em;color:var(--brand-ink);font-size:1.04rem;line-height:1.45}
.xcard p{margin:0 0 16px;color:var(--ink-soft);font-size:.9rem;line-height:1.6;flex:1}
.xcard .meta{display:flex;justify-content:space-between;align-items:center;
  font-size:.76rem;color:var(--ink-faint);font-weight:700;letter-spacing:.02em}
.xcard .meta .open{color:var(--brand-dark)}
.figure{margin:22px 0;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--shadow);background:#fff}
.figure img{display:block;width:100%}
.figure figcaption{padding:12px 18px;font-size:.88rem;color:var(--ink-soft);
  border-top:1px solid var(--line);background:#fbfcfe}

.tldr{background:linear-gradient(135deg,#0c2a66,#1d4ed8);color:#eaf1ff;border:none}
.tldr h3{color:#fff;margin:0 0 .6em}
.tldr ul{margin:0;padding-left:1.1em}
.tldr li{margin:.45em 0}
.tldr li::marker{color:#9ec3ff}
.tldr strong{color:#fff}                                   /* readable emphasis on the blue card */
.tldr em{background:linear-gradient(transparent 60%,rgba(96,165,250,.55) 60%);color:#fff}
.tldr code{background:#ffffff1f;color:#cfe6ff}

/* ---------- tables ---------- */
table{border-collapse:collapse;width:100%;font-size:.9rem;background:#fff;
  border-radius:12px;overflow:hidden;box-shadow:var(--shadow);margin:16px 0}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#eef3fb;color:var(--brand-ink);font-weight:800;font-size:.82rem;letter-spacing:.02em}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:#f7faff}
td.num,td.mono{font-family:var(--mono);white-space:nowrap;font-size:.85em}
.pill{display:inline-block;font-size:.72rem;font-weight:800;padding:3px 9px;border-radius:999px;line-height:1.4}
.p-good{background:var(--accent-soft);color:#166534}
.p-warn{background:var(--warn-soft);color:#92400e}
.p-bad{background:var(--bad-soft);color:#991b1b}
.p-mix{background:#e0e7ff;color:#3730a3}

/* ---------- callouts ---------- */
.callout{border-left:4px solid var(--brand);background:#f3f7ff;border-radius:0 12px 12px 0;
  padding:16px 20px;margin:18px 0}
.callout.warn{border-color:var(--warn);background:var(--warn-soft)}
.callout.good{border-color:var(--accent);background:var(--accent-soft)}
.callout.bad{border-color:var(--bad);background:var(--bad-soft)}
.callout h4{margin:0 0 .4em;font-size:1rem}
.callout p{margin:0;color:var(--ink-soft)}

/* ---------- stat strip ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0}
.stats .s{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;box-shadow:var(--shadow)}
.stats .s .n{font-size:1.5rem;font-weight:800;color:var(--brand-ink)}
.stats .s .l{font-size:.8rem;color:var(--ink-faint);margin-top:2px}

/* ---------- state-machine strip ---------- */
.sm{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.sm .ph{flex:1 1 0;min-width:104px;background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:12px;box-shadow:var(--shadow);position:relative}
.sm .ph .n{font-size:.7rem;font-weight:800;color:var(--brand);letter-spacing:.05em}
.sm .ph .t{font-size:.82rem;color:var(--ink-soft);margin-top:4px}
.sm .ph.grasp{border-color:#fca5a5;background:#fff5f5}
.sm .ph.release{border-color:#86efac;background:#f3fdf6}

.filechain{font-family:var(--mono);font-size:.82rem;color:var(--ink-soft);background:#f1f5fc;
  border:1px dashed #c7d6ef;border-radius:10px;padding:10px 14px;margin:10px 0;overflow-x:auto;white-space:nowrap}

/* ---------- prev/next + footer ---------- */
.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:36px 0 8px}
.pn{display:flex;flex-direction:column;gap:2px;text-decoration:none;background:#fff;border:1px solid var(--line);
  border-radius:14px;padding:14px 18px;box-shadow:var(--shadow)}
.pn:hover{border-color:var(--brand)}
.pn span{font-size:.78rem;color:var(--ink-faint);font-weight:700}
.pn b{color:var(--brand-ink)}
.pn-next{text-align:right}
footer{border-top:1px solid var(--line);margin-top:30px;padding:26px 0 50px;color:var(--ink-faint);font-size:.84rem}
footer a{color:var(--brand-dark)}

/* ---------- responsive ---------- */
@media(max-width:880px){
  .layout{grid-template-columns:1fr;gap:0}
  nav.side{position:fixed;inset:52px 0 auto 0;top:52px;z-index:30;background:#fff;border-bottom:1px solid var(--line);
    max-height:60vh;padding:12px;box-shadow:var(--shadow-lg);display:none}
  nav.side.open{display:block}
  .brandbar .menu{display:inline-block}
  .grid.two,.grid.three,.stats{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .prevnext{grid-template-columns:1fr}
}