@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=IBM+Plex+Mono:wght@400;500&family=Source+Serif+4:opsz,wght@8..60,400;8..60,600&display=swap');

:root{
  --graphite:#1A1D1B;
  --charge:#2C7A6B;
  --copper:#B87333;
  --paper:#F5F2EC;
  --muted:#8B8F94;
  --card:#ffffff;
  --line:#e0dbcf;
  --teal:#2C7A6B;
  --aluminum:#8B8F94;
}
*{box-sizing:border-box;margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--graphite);
  font-family:'Source Serif 4', serif;
  line-height:1.6;
}
a{color:inherit;text-decoration:none;}

/* NAV */
nav{
  display:flex;justify-content:space-between;align-items:center;
  padding:20px 5vw;border-bottom:1px solid var(--line);
  flex-wrap:wrap;gap:16px;
}
.logo{
  font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:19px;
  letter-spacing:-0.02em;display:flex;align-items:center;gap:8px;
}
.logo-mark{
  width:10px;height:16px;background:var(--charge);
  clip-path: polygon(60% 0%, 0% 60%, 45% 60%, 40% 100%, 100% 40%, 55% 40%);
}
.navlinks{display:flex;gap:26px;font-family:'IBM Plex Mono',monospace;font-size:12px;
  text-transform:uppercase;letter-spacing:0.08em;color:#555;flex-wrap:wrap;}
.navlinks a:hover{color:var(--copper);}
.navlinks .active{color:var(--copper);}
.subscribe-btn{
  background:var(--graphite);color:var(--paper);font-family:'Space Grotesk',sans-serif;
  font-size:13px;font-weight:600;padding:9px 18px;border-radius:3px;white-space:nowrap;
}

/* HERO */
.hero{
  padding:56px 5vw 40px;border-bottom:1px solid var(--line);
  display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:end;
}
@media (max-width:800px){ .hero{grid-template-columns:1fr;} }
.eyebrow{
  font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:0.12em;
  text-transform:uppercase;color:var(--copper);margin-bottom:14px;
}
h1{
  font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:clamp(28px,4vw,40px);
  line-height:1.1;letter-spacing:-0.02em;
}
h2{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:26px;letter-spacing:-0.01em;margin-bottom:14px;}
h3{font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:17px;margin-bottom:8px;}
.hero-sub{color:#555;font-size:15px;margin-top:14px;max-width:44ch;}

/* GENERIC PAGE SECTION */
.section{padding:48px 5vw;max-width:900px;margin:0 auto;}
.section p{color:#444;font-size:15px;margin-bottom:16px;max-width:65ch;}

/* CONTACT FORM */
.contact-wrap{max-width:520px;margin:0 auto;padding:48px 5vw;}
.contact-wrap input, .contact-wrap textarea{
  width:100%;padding:12px;border:1px solid #ccc4b2;border-radius:4px;margin-bottom:14px;
  font-family:'IBM Plex Mono',monospace;font-size:13px;background:#fff;color:var(--graphite);
}
.contact-wrap textarea{height:110px;resize:vertical;}
.contact-wrap button{
  background:var(--graphite);color:#fff;border:none;padding:12px 22px;border-radius:4px;
  font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:14px;cursor:pointer;
}
.contact-wrap button:hover{background:#000;}
.form-note{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);margin-top:10px;}
.status-msg{font-family:'IBM Plex Mono',monospace;font-size:12px;margin-top:10px;display:none;}
.status-msg.success{color:#1c8a56;display:block;}
.status-msg.error{color:#c0392b;display:block;}

footer{
  padding:26px 5vw;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);
}

/* Extended nav for full site */
.navlinks{flex-wrap:wrap;}
.social-links{display:flex;gap:10px;}
.social-links a{font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--muted);border:1px solid var(--line);
  padding:4px 9px;border-radius:20px;}
.social-links a:hover{color:var(--copper);border-color:var(--copper);}
footer{flex-wrap:wrap;}

/* Stage rail / Cell Production */
.stage-rail{display:flex;gap:8px;padding:0 5vw 24px;flex-wrap:wrap;}
.stage-pill{font-family:'IBM Plex Mono',monospace;font-size:11px;padding:7px 14px;border-radius:20px;
  border:1px solid var(--line);color:#555;background:#fff;cursor:pointer;}
.stage-pill.hl,.stage-pill:hover{background:var(--graphite);color:var(--paper);border-color:var(--graphite);}
.stage-block{margin:0 5vw 40px;padding:24px;border:1.5px solid var(--graphite);border-radius:8px;background:#fff;scroll-margin-top:20px;}
.stage-block h3{font-size:19px;margin-bottom:8px;}
.stage-block p{color:#555;font-size:13.5px;margin-bottom:14px;max-width:70ch;}
.stage-meta{font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--muted);margin-bottom:10px;}
.article-empty{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--muted);
  border:1px dashed var(--line);border-radius:4px;padding:12px;margin-top:10px;}

/* Cards */
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding:0 5vw 40px;}
@media (max-width:800px){.cards3{grid-template-columns:1fr;}}
.card{background:#fff;border:1px solid var(--line);border-radius:6px;padding:16px;}
.card .tag{font-family:'IBM Plex Mono',monospace;font-size:9.5px;text-transform:uppercase;background:#eee9db;color:#6b6455;
  padding:2px 8px;border-radius:20px;display:inline-block;margin-bottom:8px;}
.card h4{font-size:15px;font-weight:600;margin-bottom:6px;}
.card p{font-size:12.5px;color:#666;}

/* Calculator widgets */
.calc-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:24px;margin-bottom:24px;}
.calc-card h3{font-size:17px;margin-bottom:6px;}
.calc-formula{font-family:'IBM Plex Mono',monospace;font-size:12px;background:#f1efe6;padding:10px 14px;border-radius:4px;
  margin:12px 0;color:#444;}
.calc-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px;}
@media (max-width:600px){.calc-row{grid-template-columns:1fr;}}
.calc-field label{display:block;font-family:'IBM Plex Mono',monospace;font-size:11px;color:#555;margin-bottom:5px;}
.calc-field input, .calc-field select{width:100%;padding:9px 10px;border:1px solid #ccc4b2;border-radius:4px;
  font-family:'IBM Plex Mono',monospace;font-size:13px;background:#fff;}
.calc-btn{background:var(--graphite);color:#fff;border:none;padding:10px 20px;border-radius:4px;
  font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:13px;cursor:pointer;margin-top:6px;}
.calc-btn:hover{background:#000;}
.calc-result{margin-top:16px;padding:14px;border-radius:6px;background:#f1efe6;font-family:'IBM Plex Mono',monospace;font-size:13px;display:none;}
.calc-result.show{display:block;}
.calc-result .big{font-family:'Space Grotesk',sans-serif;font-size:22px;font-weight:700;color:var(--graphite);}
.calc-note{font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--muted);margin-top:10px;line-height:1.6;}
.toggle-link{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--copper);cursor:pointer;text-decoration:underline;margin-bottom:12px;display:inline-block;}
.hidden{display:none;}

/* Signature element: cell cross-section divider (copper / graphite / separator / graphite / aluminum) */
.cross-section{height:7px;display:flex;width:100%;}
.cross-section div{flex:1;}
.cross-section .layer-cu{background:var(--copper);}
.cross-section .layer-gr{background:var(--graphite);}
.cross-section .layer-sep{background:#fff;border-left:1px solid #ddd;border-right:1px solid #ddd;}
.cross-section .layer-al{background:var(--aluminum);}

/* Card accent stripe */
.card{position:relative;overflow:hidden;}
.card::before{content:'';position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--copper);}
.card .tag{background:#eaf3f1;color:var(--teal);}

/* Calculator result now uses teal */
.calc-result{background:var(--teal);color:#fff;}
.calc-result .big{color:#fff;}

/* NAV DROPDOWN */
.nav-item{position:relative;}
.nav-dropdown{
  display:none;position:absolute;top:24px;left:-10px;background:#fff;border:1px solid var(--line);
  border-radius:6px;padding:8px;min-width:190px;box-shadow:0 10px 24px rgba(0,0,0,0.1);z-index:50;
}
.nav-item:hover .nav-dropdown{display:block;}
.nav-dropdown a{
  display:block;padding:7px 10px;border-radius:4px;font-family:'IBM Plex Mono',monospace;
  font-size:11px;color:#555;text-transform:none;letter-spacing:0;
}
.nav-dropdown a:hover{background:#f1efe6;color:var(--graphite);}
.nav-dropdown hr{border:none;border-top:1px solid var(--line);margin:6px 0;}

/* SUBSCRIBE MODAL */
.modal-overlay{
  display:none;position:fixed;inset:0;background:rgba(26,29,27,0.6);z-index:100;
  align-items:center;justify-content:center;
}
.modal-overlay.show{display:flex;}
.modal-box{
  background:#fff;border-radius:8px;padding:28px;max-width:400px;width:90%;position:relative;
}
.modal-close{position:absolute;top:12px;right:16px;cursor:pointer;font-family:'IBM Plex Mono',monospace;color:var(--muted);font-size:18px;}
.modal-box h3{font-family:'Space Grotesk',sans-serif;font-size:19px;margin-bottom:8px;}
.modal-box p{font-size:13px;color:#555;margin-bottom:16px;}
.modal-box input{width:100%;padding:11px;border:1px solid #ccc4b2;border-radius:4px;margin-bottom:10px;font-family:'IBM Plex Mono',monospace;font-size:13px;}
.modal-box button{width:100%;background:var(--graphite);color:#fff;border:none;padding:11px;border-radius:4px;font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:13px;cursor:pointer;}
.modal-status{font-family:'IBM Plex Mono',monospace;font-size:11.5px;margin-top:10px;}

/* ARTICLE-END SUBSCRIBE CTA */
.subscribe-cta{
  margin:32px 5vw;padding:22px;border:1.5px solid var(--graphite);border-radius:8px;
  background:#fff;text-align:center;
}
.subscribe-cta .eyebrow{margin-bottom:6px;}
.subscribe-cta h4{font-family:'Space Grotesk',sans-serif;font-size:16px;margin-bottom:6px;}
.subscribe-cta p{font-size:12.5px;color:#555;margin-bottom:14px;}
.subscribe-cta-form{display:flex;gap:8px;max-width:380px;margin:0 auto;flex-wrap:wrap;}
.subscribe-cta-form input{flex:1;min-width:180px;padding:10px;border:1px solid #ccc4b2;border-radius:4px;font-family:'IBM Plex Mono',monospace;font-size:12.5px;}
.subscribe-cta-form button{background:var(--charge);color:#fff;border:none;padding:10px 18px;border-radius:4px;font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:12.5px;cursor:pointer;}

/* Stage crumbs within Cell Production sub-pages */
.stage-crumbs{padding:14px 5vw 0;font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);}
.stage-crumbs a{color:var(--copper);}