:root{
  --ink:#171A21; --ink-2:#4B5160; --ink-3:#8A90A0;
  --line:#E3E6EC; --paper:#FFFFFF; --field:#F5F6F9; --page:#EEF0F4;
  --brand:#1E56D6; --ok:#1B8A4C; --ok-tint:#E4F5EB;
  --r:8px;
}
*{box-sizing:border-box}
html,body{margin:0}
body{font-family:"Instrument Sans",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--page);font-size:15px;line-height:1.45;-webkit-font-smoothing:antialiased;min-height:100vh;display:flex;flex-direction:column}
button,input{font:inherit;color:inherit}
a{color:var(--brand)}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em;background:#fff;border:1px solid var(--line);padding:1px 6px;border-radius:4px}

.app{display:grid;grid-template-columns:380px 1fr;flex:1}
@media (max-width:900px){.app{grid-template-columns:1fr}}

/* ---------- form ---------- */
.form{background:var(--paper);border-right:1px solid var(--line);padding:28px 28px 40px}
.orghead{display:flex;gap:16px;align-items:center;margin-bottom:20px}
.orglogo{max-height:56px;width:auto;max-width:120px;object-fit:contain}
h1{font-size:20px;font-weight:600;letter-spacing:-.015em;margin:0 0 2px}
.lede{color:var(--ink-2);margin:0;font-size:14px}

.seg{display:inline-flex;background:var(--field);border:1px solid var(--line);border-radius:999px;padding:3px;margin-bottom:20px}
.seg button{border:0;background:transparent;padding:6px 16px;border-radius:999px;cursor:pointer;color:var(--ink-2);font-weight:500}
.seg button[aria-pressed="true"]{background:var(--ink);color:#fff}

.f{margin-bottom:12px}
.f label{display:block;font-size:13px;color:var(--ink-2);margin-bottom:5px}
.f input{width:100%;border:1px solid var(--line);background:var(--field);border-radius:var(--r);padding:10px 12px;outline:none;transition:border-color .12s,box-shadow .12s}
.f input:focus{border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 18%,#fff);background:#fff}
.join{display:flex}
.join input{border-radius:var(--r) 0 0 var(--r);min-width:0}
.join .suffix{display:flex;align-items:center;padding:0 11px;border:1px solid var(--line);border-left:0;border-radius:0 var(--r) var(--r) 0;background:#fff;color:var(--ink-3);font-size:13px;white-space:nowrap;max-width:60%;overflow:hidden;text-overflow:ellipsis}
.note{font-size:12px;color:var(--ink-3);margin-top:18px}

/* ---------- preview ---------- */
.preview{padding:28px 36px 48px;min-width:0}
@media (max-width:900px){.preview{padding:20px 16px 40px}}
.bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:16px}
.btn{border:1px solid var(--line);background:#fff;border-radius:var(--r);padding:10px 14px;cursor:pointer;font-weight:500;white-space:nowrap}
.btn:hover{border-color:var(--ink-3)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{filter:brightness(.9)}
.btn:focus-visible,input:focus-visible,button:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.status{margin-left:auto;font-size:13px;color:var(--ok);background:var(--ok-tint);padding:6px 10px;border-radius:999px;opacity:0;transition:opacity .15s}
.status.show{opacity:1}

.canvas{background:var(--paper);border:1px solid var(--line);border-radius:12px;max-width:760px;overflow:hidden}
.canvas-head{padding:10px 20px;border-bottom:1px solid var(--line);font-size:12px;color:var(--ink-3)}
.sigbox{padding:28px 24px 30px;overflow-x:auto}

/* ---------- guides ---------- */
.guides{max-width:760px;margin-top:32px}
.guides h2{font-size:17px;font-weight:600;margin:0 0 4px}
.muted{color:var(--ink-2);font-size:14px;margin:0 0 14px}
.guides details{background:var(--paper);border:1px solid var(--line);border-radius:10px;margin-bottom:8px}
.guides summary{cursor:pointer;padding:14px 18px;font-weight:600;list-style:none;display:flex;align-items:baseline;gap:10px}
.guides summary::-webkit-details-marker{display:none}
.guides summary small{font-weight:400;color:var(--ink-3);font-size:13px;flex:1}
.guides summary::after{content:"+";color:var(--ink-3);font-weight:400}
.guides details[open] summary::after{content:"–"}
.guides .inner{padding:0 18px 18px}
.guides ol{margin:0 0 12px;padding-left:22px}
.guides li{margin-bottom:6px}
.guides img.guide{display:block;max-width:100%;border:1px solid var(--line);border-radius:8px;margin-top:8px}

/* ---------- landing / footer ---------- */
.landing{max-width:560px;margin:10vh auto;padding:0 20px;flex:1}
.landing .brand{font-weight:700;letter-spacing:-.01em;margin:0 0 6px}
.landing h1{font-size:24px;margin-bottom:14px}
.landing p{margin:0 0 12px}
.foot{display:flex;justify-content:space-between;gap:12px;padding:14px 28px;font-size:12px;color:var(--ink-3);border-top:1px solid var(--line)}
.foot a{color:var(--ink-2)}
.sigbox > table{min-width:440px}