/* The site: the "Paper" direction picked on the board — warm paper, ink,
   a serif headline and one warm accent. */
:root{
  --paper:#f5f1e9;--paper-2:#fbf8f2;--ink:#242820;--muted:#68695e;--line:#ddd5c7;--soft:#ece6da;
  --accent:#a25a2c;--accent-ink:#fff8f0;
  --font-head:"Iowan Old Style","Palatino Linotype","New York",Georgia,serif;
  --font-body:-apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","Segoe UI",sans-serif;
  --r:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--font-body);-webkit-font-smoothing:antialiased}
a{color:inherit}
img{display:block}

.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:999px;background:var(--accent);color:var(--accent-ink);
  font:600 15px/1 var(--font-body);text-decoration:none;border:1.5px solid var(--accent);cursor:pointer;transition:transform .15s,box-shadow .2s,background .3s,border-color .3s,color .3s}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 18px -6px color-mix(in srgb,var(--accent) 60%,transparent)}
.btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{box-shadow:none;border-color:var(--ink)}
.btn-small{padding:8px 14px;font-size:14px}

/* Hero: exactly one screen, so the intro can hand over to it seamlessly. */
.hero{position:relative;height:100vh;height:100svh;min-height:560px;display:flex;flex-direction:column;overflow:hidden;
  background:radial-gradient(120% 80% at 85% 20%,var(--paper-2) 0,var(--paper) 60%)}
.nav{display:flex;align-items:center;gap:28px;padding:22px clamp(20px,5vw,72px)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:650;letter-spacing:-.01em}
.brand img{width:28px;height:28px;border-radius:7px}
.nav-links{display:flex;gap:24px;margin-left:auto;font-size:14px;color:var(--muted)}
.nav-links a{text-decoration:none;transition:color .2s}
.nav-links a:hover{color:var(--ink)}
.hero-body{flex:1;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,.8fr);align-items:center;gap:clamp(24px,4vw,64px);padding:0 clamp(20px,5vw,72px) 6vh}
.eyebrow{margin:0 0 18px;font-size:14px;color:var(--muted);letter-spacing:.01em}
.hero h1{margin:0;font:400 clamp(40px,4.5vw,76px)/1.02 var(--font-head);letter-spacing:-.025em;white-space:nowrap}
.lede{margin:24px 0 0;max-width:34em;font-size:clamp(16px,1.35vw,20px);color:var(--muted)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.hero-note{margin:16px 0 0;font-size:13px;color:var(--muted)}

/* The hero picture: a small board, the same one the page came from. */
.hero-art{display:flex;justify-content:center}
.mini-board{position:relative;width:min(100%,520px);aspect-ratio:4/3;border-radius:22px;background:var(--paper-2);border:1px solid var(--line);
  background-image:radial-gradient(color-mix(in srgb,var(--line) 90%,transparent) 1.2px,transparent 1.3px);background-size:18px 18px;
  box-shadow:0 30px 60px -30px rgb(60 40 20 / 35%),0 2px 4px rgb(60 40 20 / 6%)}
.mb-card{position:absolute;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px;box-shadow:0 2px 6px rgb(60 40 20 / 7%)}
.mb-card b{display:block;font:600 12px/1.2 var(--font-body);margin-bottom:8px}
.mb-card i{display:block;height:6px;border-radius:3px;background:var(--soft);margin-top:6px}
.mb-card i+i{width:70%}
.mb-guide{left:6%;top:9%;width:28%;border-color:color-mix(in srgb,var(--accent) 35%,var(--line));background:linear-gradient(#fff,color-mix(in srgb,var(--accent) 5%,#fff))}
.mb-a{left:52%;top:9%;width:40%}.mb-b{left:52%;top:38%;width:40%}.mb-c{left:52%;top:67%;width:40%}
.mb-done{position:absolute;right:10px;top:9px;width:16px;height:16px;border-radius:50%;background:#2f7d4f;color:#fff;font-size:10px;display:grid;place-items:center}
.mb-av{position:absolute;right:10px;top:8px;width:18px;height:18px;border-radius:5px}
.mb-codex,.av.codex{background:#111 url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M7 8l4 4-4 4M13 16h4' fill='none' stroke='white' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/70% no-repeat}
.mb-claude,.av.claude{background:#d97757 url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cg stroke='white' stroke-width='2.4' stroke-linecap='round'%3E%3Cpath d='M12 4v16M4 12h16M6.3 6.3l11.4 11.4M17.7 6.3 6.3 17.7'/%3E%3C/g%3E%3C/svg%3E") center/62% no-repeat}
.mb-note{position:absolute;left:8%;top:58%;padding:8px 10px;border-radius:8px;background:#fff6e1;border:1px solid #f0d49a;font:500 12px/1.3 var(--font-body);transform:rotate(-2deg)}
.mb-links{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.mb-links path{fill:none;stroke:color-mix(in srgb,var(--accent) 45%,var(--line));stroke-width:1.5}

/* Sections */
.section{padding:clamp(72px,10vw,140px) clamp(20px,5vw,72px);max-width:1240px;margin:0 auto}
.section-alt{max-width:none;background:var(--paper-2);border-block:1px solid var(--line)}
.section-alt>*{max-width:1096px;margin-left:auto;margin-right:auto}
.kicker{margin:0 0 12px;font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.section h2{margin:0 0 48px;font:400 clamp(30px,3.6vw,52px)/1.1 var(--font-head);letter-spacing:-.02em;max-width:18em}
.fine{margin-top:32px;font-size:14px;color:var(--muted);max-width:44em}

.loops{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.loop h3{margin:20px 0 8px;font-size:18px}
.loop p{margin:0;color:var(--muted)}
.loop-art{position:relative;height:200px;border-radius:var(--r);border:1px solid var(--line);background:var(--paper-2);overflow:hidden;
  background-image:radial-gradient(var(--line) 1.1px,transparent 1.2px);background-size:16px 16px}
.loop-art .c{position:absolute;width:30%;height:34%;background:#fff;border:1px solid var(--line);border-radius:9px;box-shadow:0 2px 6px rgb(60 40 20 / 7%)}
.art-ask .q{position:absolute;left:8%;top:12%;right:8%;padding:9px 12px;border-radius:10px;background:#fff;border:1.5px solid var(--accent);font-size:13px;box-shadow:0 8px 20px -10px rgb(60 40 20 / 30%)}
.art-ask .c1{left:8%;top:48%}.art-ask .c2{left:35%;top:56%}.art-ask .c3{left:62%;top:48%}
.art-mark .c{left:12%;top:18%;width:48%;height:46%}
.art-mark .ink{position:absolute;left:8%;top:12%;width:57%;height:58%;border:2.5px solid var(--accent);border-radius:50% 45% 52% 48%;transform:rotate(-4deg);opacity:.8}
.art-mark .note{position:absolute;right:7%;bottom:12%;max-width:52%;padding:8px 10px;border-radius:8px;background:#fff6e1;border:1px solid #f0d49a;font-size:12px;line-height:1.35}
.art-many .c1{left:8%;top:14%}.art-many .c2{left:40%;top:14%}
.art-many .av{position:absolute;left:8px;top:8px;width:18px;height:18px;border-radius:5px}
.art-many .approve{position:absolute;left:8%;right:8%;bottom:12%;display:flex;align-items:center;gap:8px;padding:9px 10px 9px 12px;border-radius:10px;background:#fff;border:1px solid var(--line);font-size:12px;box-shadow:0 8px 20px -10px rgb(60 40 20 / 30%)}
.art-many .approve code{font-size:11px;background:var(--soft);padding:1px 5px;border-radius:4px}
.art-many .approve b{margin-left:auto;padding:5px 10px;border-radius:999px;background:var(--accent);color:var(--accent-ink);font-size:12px}

.things{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.things li{background:var(--paper-2);padding:28px}
.things b{display:block;font:400 22px/1.2 var(--font-head);margin-bottom:8px}
.things span{color:var(--muted);font-size:15px}

.agents{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.agent{display:grid;grid-template-columns:auto 1fr;column-gap:14px;align-items:center;padding:22px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper-2)}
.agent .av{grid-row:span 2;width:44px;height:44px;border-radius:11px}
.agent .av.mcp{display:grid;place-items:center;background:var(--soft);font:700 12px/1 var(--font-body);color:var(--muted)}
.agent b{font-size:17px}
.agent small{color:var(--muted);font-size:13px;line-height:1.4}

.open{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.open p{margin:0 0 16px;color:var(--muted)}
.tree{margin:0;padding:24px;border-radius:var(--r);background:#1f2320;color:#e9e4d8;font:13px/1.8 ui-monospace,SFMono-Regular,Menlo,monospace;overflow:auto}
.tree em{color:#a8a291;font-style:normal}
.link{color:var(--accent);font-weight:600;text-decoration:none}

.download{text-align:center}
.download h2{margin-left:auto;margin-right:auto}
.downloads{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.dl{display:flex;flex-direction:column;gap:2px;min-width:220px;padding:20px 28px;border-radius:var(--r);background:var(--accent);color:var(--accent-ink);text-decoration:none;transition:transform .15s}
.dl:hover{transform:translateY(-2px)}
.dl b{font-size:18px}.dl small{opacity:.8}
.dl+.dl{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.download .fine{margin-left:auto;margin-right:auto}

.footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:32px clamp(20px,5vw,72px);border-top:1px solid var(--line);font-size:13px;color:var(--muted)}

@media (max-width:900px){
  .hero-body{grid-template-columns:1fr;align-content:center;gap:32px}
  .hero h1{white-space:normal}
  .hero-art{display:none}
  .nav-links{display:none}
  .nav .btn{margin-left:auto}
  .loops,.things,.agents,.open{grid-template-columns:1fr}
}