@import url('https://fonts.googleapis.com/css2?family=Lexend:wght@200;300;400;500;600;700;800&family=Roboto+Mono:wght@300;400;500&display=swap');

:root {
  --base: #f8f6f4;
  --surface: #f0ecea;
  --paper: #e8e4e0;
  --ink: #1a1208;
  --chain1: #e84030;
  --chain2: #e8a020;
  --chain3: #20b060;
  --chain4: #2080e0;
  --chain5: #9030c0;
  --chain6: #e06080;
  --border: rgba(40,20,10,0.12);
  --text: #5a4030;
  --text-bright: #2a1808;
  --text-muted: #8a7060;
  --accent: #c83820;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Lexend',sans-serif;background:var(--base);color:var(--text);min-height:100vh;overflow-x:hidden;}
#poly-canvas{position:fixed;inset:0;z-index:0;pointer-events:none;}
.wrap{position:relative;z-index:2;max-width:1040px;margin:0 auto;padding:0 28px 90px;}

/* ── HERO ── */
.hero{padding:68px 0 52px;border-bottom:1px solid var(--border);margin-bottom:58px;}
.hero-tag{font-size:0.58rem;letter-spacing:5px;text-transform:uppercase;color:var(--accent);opacity:0.7;margin-bottom:14px;font-weight:500;}
.hero h1{font-size:clamp(4rem,12vw,8rem);font-weight:800;line-height:0.88;color:var(--ink);letter-spacing:-3px;}
.hero h1 em{display:block;font-size:0.2em;font-style:normal;font-weight:300;letter-spacing:6px;color:var(--text-muted);margin-top:12px;font-family:'Roboto Mono',monospace;text-transform:uppercase;}
.hero-desc{font-size:0.97rem;line-height:1.88;color:var(--text);font-weight:300;margin-top:18px;max-width:620px;}

/* ── Chain animation strip ── */
#chain-strip{display:block;width:100%;margin-bottom:58px;border:1px solid var(--border);border-radius:4px;background:var(--surface);}

/* ── Stats ── */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));border:1px solid var(--border);overflow:hidden;margin-bottom:56px;border-radius:3px;background:var(--surface);}
.stat{padding:18px 14px;background:var(--surface);border-right:1px solid var(--border);transition:background 0.2s;}
.stat:last-child{border-right:none;} .stat:hover{background:var(--paper);}
.s-label{font-family:'Roboto Mono',monospace;font-size:0.52rem;letter-spacing:2px;text-transform:uppercase;color:var(--accent);opacity:0.7;margin-bottom:7px;}
.s-value{font-size:1.05rem;font-weight:700;color:var(--ink);line-height:1.1;}
.s-unit{font-size:0.6rem;color:var(--text-muted);}

/* ── Sections ── */
.section{margin-bottom:56px;opacity:0;transform:translateY(18px);transition:opacity 0.65s,transform 0.65s;}
.section.visible{opacity:1;transform:none;}
.sh{display:flex;align-items:baseline;gap:14px;margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid var(--border);}
.sn{font-family:'Roboto Mono',monospace;font-size:0.55rem;letter-spacing:3px;color:var(--accent);opacity:0.5;}
.section h2{font-size:1.5rem;font-weight:800;color:var(--ink);letter-spacing:-0.5px;}
p{font-size:0.96rem;line-height:1.87;color:var(--text);font-weight:300;margin-bottom:14px;}
strong{color:var(--text-bright);font-weight:700;}

/* ── Polymer types ── */
.poly-types{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-top:18px;}
.pt-card{background:var(--surface);border:1px solid var(--border);border-top:3px solid;border-radius:3px;padding:18px;transition:background 0.2s;}
.pt-card:hover{background:var(--paper);}
.pt-card h3{font-size:0.85rem;font-weight:700;color:var(--ink);margin-bottom:6px;text-transform:uppercase;letter-spacing:0.5px;}
.pt-card p{font-size:0.8rem;margin:0;line-height:1.55;}

/* ── Polymerization canvas ── */
.reaction-wrap{background:var(--surface);border:1px solid var(--border);border-radius:4px;padding:20px;margin-top:18px;text-align:center;}
#polym-canvas{display:block;margin:0 auto 10px;}
.poly-cap{font-family:'Roboto Mono',monospace;font-size:0.6rem;color:var(--text-muted);letter-spacing:2px;text-transform:uppercase;}

/* ── Key polymers ── */
.polymers-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;margin-top:18px;}
.pg-card{background:var(--surface);border:1px solid var(--border);padding:18px;border-radius:3px;display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start;transition:background 0.2s;}
.pg-card:hover{background:var(--paper);}
.pg-color{width:6px;border-radius:3px;align-self:stretch;flex-shrink:0;}
.pg-card h3{font-size:0.82rem;font-weight:700;color:var(--ink);margin-bottom:3px;}
.pg-abr{font-family:'Roboto Mono',monospace;font-size:0.65rem;color:var(--accent);opacity:0.7;margin-bottom:6px;letter-spacing:1px;}
.pg-card p{font-size:0.78rem;margin:0;line-height:1.55;}

/* ── Properties ── */
.props-table{width:100%;border-collapse:collapse;margin-top:18px;font-size:0.86rem;}
.props-table th{font-family:'Roboto Mono',monospace;font-size:0.55rem;letter-spacing:2px;text-transform:uppercase;color:var(--accent);border-bottom:1px solid var(--border);padding:10px 14px;text-align:left;opacity:0.7;}
.props-table td{padding:11px 14px;border-bottom:1px solid rgba(40,20,10,0.07);color:var(--text);}
.props-table td:first-child{font-weight:700;color:var(--ink);}
.props-table tr:hover td{background:var(--paper);}

/* ── Plastic pollution ── */
.env-box{background:linear-gradient(135deg,#fff8f0,#fff0e8);border:1px solid rgba(200,80,20,0.2);border-left:3px solid var(--accent);border-radius:3px;padding:24px 26px;margin-top:18px;}
.env-box h3{font-size:0.82rem;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:1px;margin-bottom:12px;}
.env-box p{margin:0 0 10px;} .env-box p:last-child{margin:0;}

.footer-band{margin-top:70px;border-top:1px solid var(--border);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;}
.footer-band span{font-family:'Roboto Mono',monospace;font-size:0.52rem;letter-spacing:2px;color:var(--text-muted);text-transform:uppercase;}
@media(max-width:600px){.poly-types{grid-template-columns:1fr 1fr;} .pg-card{grid-template-columns:1fr;}}