/* Mainspring (mainspring.one) — RevenueHouse's product arm, standalone brand stylesheet.
   Same type system and core palette as site-revenuehouse.css (paper / ink / chartreuse,
   Bricolage Grotesque + Instrument Sans + IBM Plex Mono), but dark-first chrome, a brass
   accent in place of plum, and the coil mark, so it reads as a product rather than the agency. */
:root{
  --paper:#F3EEE4; --paper-2:#EAE3D5; --card:#FBF8F2; --ink:#15120E; --ink-2:#2A251E; --ink-3:#1E1A15;
  --body:#3B352C; --mute:#7A7163; --line:#D9D0BF; --line-d:#3A342B;
  --sig:#C9F25C; --sig-2:#B4E03A; --brass:#D9A441; --brass-2:#B8862A; --clay:#C8643B;
  --r:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:"Instrument Sans",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--body);
     background:var(--paper);font-size:17px;line-height:1.62;-webkit-font-smoothing:antialiased;overflow-x:hidden}
::selection{background:var(--sig);color:var(--ink)}
a{color:inherit}
img,svg{max-width:100%}
.wrap{max-width:1240px;margin:0 auto;padding:0 clamp(16px,4.5vw,56px)}
h1,h2,h3,h4{font-family:"Bricolage Grotesque","Instrument Sans",sans-serif;color:var(--ink);
            letter-spacing:-.03em;line-height:1.02;text-wrap:balance;font-weight:700}
h1{font-size:clamp(2.7rem,7.2vw,6rem);font-weight:800;letter-spacing:-.045em;line-height:.95}
h2{font-size:clamp(2rem,4.4vw,3.5rem);letter-spacing:-.04em}
h3{font-size:clamp(1.2rem,1.7vw,1.45rem);line-height:1.15;letter-spacing:-.02em}
h4{font-size:1.05rem;letter-spacing:-.01em;line-height:1.25}
p{max-width:40em}
.lede{font-size:clamp(1.08rem,1.55vw,1.3rem);line-height:1.5;color:var(--ink-2);max-width:34em}
.mono,.tag{font-family:"IBM Plex Mono",ui-monospace,Consolas,monospace}
.tag{display:inline-flex;align-items:center;gap:10px;font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;
     font-weight:500;color:var(--ink);margin-bottom:22px}
.tag::before{content:"";width:12px;height:12px;border-radius:50%;background:conic-gradient(var(--brass) 0 25%,var(--sig) 0);box-shadow:0 0 0 2px var(--ink)}
.hl{background:linear-gradient(transparent 58%,var(--sig) 58%,var(--sig) 92%,transparent 92%);padding:0 .06em}
em.serif{font-style:italic;font-weight:400;font-family:"Instrument Serif",Georgia,serif;letter-spacing:-.01em}
section{padding:clamp(64px,9vw,124px) 0}
.ink{background:var(--ink);color:#CFC6B6}
.ink h1,.ink h2,.ink h3,.ink h4{color:var(--paper)}
.ink .tag{color:var(--paper)}
.ink .tag::before{box-shadow:0 0 0 2px var(--paper)}
.ink .lede{color:#E2DACB}
.ink .hl{background:none;color:var(--sig);padding:0}
.alt{background:var(--paper-2)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;font-weight:600;font-size:1rem;text-decoration:none;
     padding:15px 24px;border-radius:10px;border:2px solid var(--ink);transition:background .15s,color .15s}
.btn::after{content:"→";font-family:"IBM Plex Mono",monospace;transition:transform .15s}
.btn:hover::after{transform:translateX(4px)}
.btn-sig{background:var(--sig);color:var(--ink)}
.btn-sig:hover{background:var(--ink);color:var(--sig)}
.ink .btn-sig{border-color:var(--sig)}
.ink .btn-sig:hover{background:transparent;color:var(--sig)}
.btn-line{background:transparent;color:var(--ink)}
.btn-line:hover{background:var(--ink);color:var(--paper)}
.ink .btn-line{border-color:var(--paper);color:var(--paper)}
.ink .btn-line:hover{background:var(--paper);color:var(--ink)}
.btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}

/* header (dark, unlike RevenueHouse's paper header) */
.ms-top{position:sticky;top:0;z-index:50;background:rgba(21,18,14,.94);backdrop-filter:blur(10px);
        -webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line-d)}
.ms-top .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.ms-brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--paper)}
.ms-brand svg{width:34px;height:34px;flex:none}
.ms-brand svg circle:first-child{stroke:var(--line-d);stroke-width:1}
.ms-brand .wm{font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:1.32rem;letter-spacing:-.04em;line-height:1}
.ms-brand .by{font-family:"IBM Plex Mono",monospace;font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:var(--brass);
              border-left:1px solid var(--line-d);padding-left:11px;margin-left:1px}
.ms-nav{display:flex;align-items:center;gap:6px}
.ms-nav a{text-decoration:none;font-weight:500;font-size:.95rem;padding:9px 14px;border-radius:8px;color:#D9D0BF}
.ms-nav a:hover{background:var(--ink-2);color:var(--paper)}
.ms-nav a.on{background:var(--paper);color:var(--ink)}
.ms-nav a.ext{color:var(--brass)}
.ms-nav a.ext:hover{color:var(--paper)}
.ms-nav a.cta{background:var(--sig);color:var(--ink);font-weight:600;margin-left:8px}
.ms-nav a.cta:hover,.ms-nav a.cta.on{background:var(--paper);color:var(--ink)}
.ms-burger{display:none;background:none;border:2px solid var(--paper);border-radius:8px;width:46px;height:40px;cursor:pointer;
           align-items:center;justify-content:center;flex-direction:column;gap:5px}
.ms-burger i{display:block;width:18px;height:2px;background:var(--paper)}
@media (max-width:960px){
  .ms-burger{display:inline-flex}
  .ms-nav{display:none;position:absolute;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;
          background:var(--ink);border-bottom:1px solid var(--line-d);padding:12px 16px 20px}
  .ms-nav.open{display:flex}
  .ms-nav a{padding:13px 14px;font-size:1.05rem}
  .ms-nav a.cta{margin:8px 0 0;text-align:center}
}
@media (max-width:420px){.ms-brand .by{display:none}}

/* hero */
.hero{padding:clamp(48px,7vw,96px) 0 clamp(56px,8vw,104px)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,.85fr);gap:clamp(32px,5vw,72px);align-items:center}
.hero h1{margin-bottom:28px}
.hero-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:34px}
.chip{font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.04em;padding:7px 12px;border:1px solid var(--brass);
      border-radius:6px;color:var(--brass)}
.hero-art{display:grid;place-items:center}
.ms-coil{width:100%;max-width:440px;height:auto}
.ms-coil .spin{transform-origin:200px 200px;animation:ms-wind 60s linear infinite}
@keyframes ms-wind{to{transform:rotate(-360deg)}}
@media (prefers-reduced-motion:reduce){.ms-coil .spin{animation:none}}
.page-hero{padding:clamp(48px,7vw,96px) 0 clamp(40px,6vw,72px);border-bottom:1px solid var(--line)}
.page-hero .crumb{font-family:"IBM Plex Mono",monospace;font-size:.78rem;color:var(--mute);margin-bottom:22px;letter-spacing:.06em}
.page-hero .crumb b{color:var(--ink);font-weight:500}
.page-hero h1{font-size:clamp(2.5rem,6.2vw,5.2rem);max-width:13em;margin-bottom:26px}

/* name strip */
.name-strip{background:var(--brass);padding:clamp(48px,6vw,80px) 0;border-bottom:2px solid var(--ink)}
.name-strip .tag::before{box-shadow:0 0 0 2px var(--ink);background:var(--ink)}
.big-quote{font-family:"Bricolage Grotesque",sans-serif;font-size:clamp(1.5rem,3.1vw,2.5rem);line-height:1.18;letter-spacing:-.03em;
           color:var(--ink);max-width:28em;font-weight:500}
.big-quote b{font-weight:800}
.name-strip .more{display:inline-block;margin-top:22px;font-family:"IBM Plex Mono",monospace;font-size:.85rem;color:var(--ink);font-weight:500}

/* section heads */
.sh{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(24px,5vw,72px);align-items:end;margin-bottom:clamp(36px,5vw,64px)}
.sh p{font-size:1.08rem}
.sh.solo{grid-template-columns:1fr}
.sh.solo h2{max-width:18em}

/* agents (the gear train) */
.agents{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border:2px solid var(--ink);border-radius:var(--r);overflow:hidden;background:var(--card)}
.agents .a{padding:28px 26px 30px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);position:relative}
.agents .a:nth-child(3n){border-right:0}
.agents .a:nth-last-child(-n+3){border-bottom:0}
.agents .a .n{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--ink);color:var(--sig);
              font-family:"IBM Plex Mono",monospace;font-size:.8rem;margin-bottom:18px}
.agents .a h3{margin-bottom:8px}
.agents .a p{font-size:.95rem}
.agents.on-ink{background:var(--ink-3);border-color:var(--line-d)}
.agents.on-ink .a{border-color:var(--line-d)}
.agents.on-ink .a .n{background:var(--sig);color:var(--ink)}

/* feature grid */
.feat{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.feat .f{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:28px 26px 30px}
.feat .f .ic{width:46px;height:42px;border-radius:8px;background:var(--ink);color:var(--brass);display:grid;place-items:center;
             font-family:"IBM Plex Mono",monospace;font-size:.76rem;font-weight:500;margin-bottom:20px}
.feat .f h3{font-size:1.22rem;margin-bottom:10px}
.feat .f p{font-size:.95rem}

/* split + list */
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(32px,6vw,96px);align-items:start}
.split .sticky{position:sticky;top:110px}
.list{list-style:none;border-top:2px solid var(--ink)}
.list li{padding:20px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:44px minmax(0,1fr);gap:14px}
.list li .n{font-family:"IBM Plex Mono",monospace;font-size:.8rem;color:var(--brass-2);padding-top:4px}
.list li b{display:block;font-family:"Bricolage Grotesque",sans-serif;color:var(--ink);font-size:1.15rem;letter-spacing:-.02em;margin-bottom:4px}
.list li span{font-size:.96rem}

/* do / don't */
.dd{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}
.dd .col{border-radius:var(--r);padding:30px 28px}
.dd .yes{background:var(--sig);color:var(--ink)}
.dd .yes h3{color:var(--ink)}
.dd .no{background:var(--ink-3);border:1px dashed var(--mute)}
.dd h3{margin-bottom:16px}
.dd ul{list-style:none}
.dd li{padding:9px 0 9px 30px;position:relative;font-size:.97rem;border-top:1px solid rgba(21,18,14,.14)}
.dd .no li{border-color:var(--line-d)}
.dd .yes li::before{content:"✓";position:absolute;left:2px;font-weight:700}
.dd .no li::before{content:"✕";position:absolute;left:2px;color:var(--clay);font-weight:700}

/* metrics */
.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.metrics .m{border:2px solid var(--ink);border-radius:var(--r);padding:24px 22px;background:var(--card)}
.metrics .m .k{font-family:"IBM Plex Mono",monospace;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--brass-2);margin-bottom:12px}
.metrics .m b{display:block;font-family:"Bricolage Grotesque",sans-serif;font-size:1.3rem;color:var(--ink);letter-spacing:-.02em;line-height:1.15;margin-bottom:8px}
.metrics .m p{font-size:.9rem}

/* pair (two-column prose) */
.pair{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(28px,5vw,80px);align-items:start}
.pair a{text-decoration-color:var(--brass);text-underline-offset:3px}

/* why page */
.why-grid{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(32px,6vw,96px);align-items:center}
.parts{border-top:2px solid var(--ink)}
.parts .p{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.5fr);gap:clamp(18px,4vw,56px);padding:28px 0;border-bottom:1px solid var(--line)}
.parts .k span{display:block;font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:clamp(1.6rem,3vw,2.4rem);
               color:var(--ink);letter-spacing:-.04em;line-height:1}
.parts .k b{display:block;margin-top:10px;font-family:"IBM Plex Mono",monospace;font-weight:500;font-size:.82rem;color:var(--brass-2);letter-spacing:.04em}
.parts .p p{font-size:1.02rem}

/* faq */
.faq{border-top:2px solid var(--ink)}
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{cursor:pointer;list-style:none;padding:20px 48px 20px 0;position:relative;font-family:"Bricolage Grotesque",sans-serif;
             font-weight:600;font-size:1.2rem;color:var(--ink);letter-spacing:-.02em}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:6px;top:14px;font-family:"IBM Plex Mono",monospace;font-size:1.5rem;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{padding:0 0 22px;font-size:.98rem}

/* cta band */
.band{background:var(--ink);border-top:4px solid var(--sig);padding:clamp(56px,8vw,104px) 0}
.band .wrap{display:grid;grid-template-columns:minmax(0,1.4fr) auto;gap:32px;align-items:end}
.band h2{font-size:clamp(2.2rem,5.2vw,4.4rem);color:var(--paper)}
.band p{margin-top:16px;color:#CFC6B6;font-size:1.08rem}
.band .btn-sig{border-color:var(--sig)}
.band .btn-sig:hover{background:transparent;color:var(--sig)}

/* early access */
.contact-grid{display:grid;grid-template-columns:minmax(0,.75fr) minmax(0,1.25fr);gap:clamp(28px,5vw,72px);align-items:start}
.formbox{border:2px solid var(--ink);border-radius:16px;overflow:hidden;background:#fff;box-shadow:10px 10px 0 var(--brass)}
.formbox iframe{display:block;width:100%;height:640px;border:0}
.next{list-style:none;counter-reset:n;margin-top:28px}
.next li{counter-increment:n;padding:18px 0 18px 56px;position:relative;border-top:1px solid var(--line)}
.next li::before{content:counter(n,decimal-leading-zero);position:absolute;left:0;top:16px;width:38px;height:38px;border-radius:50%;
                 background:var(--ink);color:var(--sig);display:grid;place-items:center;font-family:"IBM Plex Mono",monospace;font-size:.78rem}
.next li b{display:block;color:var(--ink);font-family:"Bricolage Grotesque",sans-serif;font-size:1.08rem;letter-spacing:-.01em}
.next li span{font-size:.94rem}
.note{margin-top:22px;font-size:.88rem;color:var(--mute);font-family:"IBM Plex Mono",monospace}

/* footer */
.ms-foot{background:var(--ink);color:#A79E8E;padding:clamp(56px,7vw,88px) 0 34px;border-top:1px solid var(--line-d)}
.ms-foot .big{font-family:"Bricolage Grotesque",sans-serif;font-weight:800;color:var(--paper);letter-spacing:-.05em;line-height:.9;
              font-size:clamp(3.2rem,12vw,10.5rem);margin-bottom:clamp(36px,5vw,64px)}
.ms-foot .big span{font-weight:400;color:var(--brass)}
.ms-foot .cols{display:grid;grid-template-columns:minmax(0,1.4fr) repeat(2,minmax(0,1fr));gap:32px;padding-bottom:40px;border-bottom:1px solid var(--line-d)}
.ms-foot h4{color:var(--paper);font-size:.74rem;font-family:"IBM Plex Mono",monospace;letter-spacing:.14em;text-transform:uppercase;font-weight:500;margin-bottom:16px}
.ms-foot .cols a{display:block;text-decoration:none;color:#D9D0BF;padding:5px 0}
.ms-foot .cols a:hover{color:var(--sig)}
.ms-foot .cols p{font-size:.95rem;max-width:24em}
.ms-foot .legal{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding-top:24px;font-size:.82rem;font-family:"IBM Plex Mono",monospace}

/* responsive */
@media (max-width:1060px){
  .agents{grid-template-columns:repeat(2,minmax(0,1fr))}
  .agents .a{border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
  .agents .a:nth-child(2n){border-right:0}
  .agents .a:nth-last-child(-n+2){border-bottom:0}
  .agents.on-ink .a{border-color:var(--line-d)}
  .feat{grid-template-columns:repeat(2,minmax(0,1fr))}
  .metrics{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:820px){
  .hero-grid,.sh,.split,.dd,.pair,.why-grid,.contact-grid,.band .wrap,.parts .p{grid-template-columns:minmax(0,1fr)}
  .hero-art{order:-1}
  .ms-coil{max-width:260px}
  .split .sticky{position:static}
  .ms-foot .cols{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .ms-foot .cols>div:first-child{grid-column:1/-1}
  .formbox{box-shadow:6px 6px 0 var(--brass)}
}
@media (max-width:560px){
  body{font-size:16px}
  .agents,.feat,.metrics{grid-template-columns:minmax(0,1fr)}
  .agents .a,.agents .a:nth-child(2n){border-right:0;border-bottom:1px solid var(--line)}
  .agents.on-ink .a{border-color:var(--line-d)}
  .agents .a:last-child{border-bottom:0}
  .btn{width:100%;justify-content:center}
  .formbox iframe{height:600px}
}