/* ============================================================
   PolyLoop Knowledge Base — v2 "The Polymer Index"
   Scientific-platform structure (v2) + v1 "Porsche" polish
   Green-white brand palette · refined pill buttons · tucked loop
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Inter:wght@400;450;500;600;700&family=Spline+Sans+Mono:wght@400;500;600&display=swap');

:root {
  --green:       #009000;
  --green-deep:  #187818;
  --green-700:   #0B5D12;
  --green-300:   #4FB35A;
  --mint:        #90EDAC;
  --mint-soft:   #E7F7EC;
  --mint-tint:   #F3FBF5;

  --ink:      #0E1A12;
  --slate:    #3A4A40;
  --muted:    #6B7B70;
  --line:     #DCE7DF;
  --line-2:   #E9F1EB;
  --paper:    #FFFFFF;
  --ground:   #F6FAF7;

  /* v1's refined amber signal — kept for that elite CTA feel */
  --amber:      #E0A458;
  --amber-deep: #C6863A;

  --biobased:   #009000;
  --fossil:     #6B7B70;
  --degrade:    #16A34A;
  --durable:    #C2703B;

  /* v1 pairing: Fraunces display gives the refined "Porsche" headline feel */
  --serif:  'Fraunces', Georgia, serif;
  --sans:   'Inter', system-ui, -apple-system, sans-serif;
  --mono:   'Spline Sans Mono', ui-monospace, Menlo, monospace;

  --maxw: 1180px;
  --sidebar: 248px;
  --r: 12px;
  --r-lg: 18px;
  --shadow-sm: 0 1px 2px rgba(14,26,18,0.04), 0 1px 3px rgba(14,26,18,0.06);
  --shadow: 0 4px 12px rgba(14,26,18,0.06), 0 12px 28px rgba(14,26,18,0.05);
  --shadow-lg: 0 18px 48px rgba(11,93,18,0.10);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--sans); color: var(--slate); background: var(--ground); line-height: 1.6; font-size: 16.5px; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: var(--green-700); text-decoration: none; transition: color .15s; }
a:hover { color: var(--amber-deep); }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ---- Typography: Fraunces display (v1 refinement) ---- */
h1,h2,h3,h4 { font-family: var(--serif); color: var(--ink); font-weight: 600; line-height: 1.08; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.4rem, 4.6vw, 3.8rem); }
h2 { font-size: clamp(1.7rem, 3vw, 2.5rem); }
h3 { font-size: 1.3rem; letter-spacing: -0.01em; }
h4 { font-size: 1.05rem; }
p { margin-bottom: 1rem; }
.lead { font-size: 1.2rem; line-height: 1.55; color: var(--slate); font-weight: 450; }

.eyebrow { font-family: var(--mono); font-size: 0.72rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.16em; color: var(--green); display: inline-flex; align-items: center; gap: 8px; margin-bottom: 1rem; }
.eyebrow::before { content: ""; width: 16px; height: 1.5px; background: var(--green); display:inline-block; }

/* ---- Header ---- */
.site-head { position: sticky; top: 0; z-index: 60; background: rgba(255,255,255,0.88); backdrop-filter: blur(12px) saturate(1.2); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--serif); font-weight: 600; font-size: 1.22rem; color: var(--ink); }
.brand .loop-mark { width: 28px; height: 28px; flex: none; }
.brand small { display:block; font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); line-height:1; margin-top:3px; font-weight:500;}
.topnav { display: flex; gap: 4px; align-items: center; }
.topnav a { font-size: 0.92rem; font-weight: 500; color: var(--slate); padding: 8px 14px; border-radius: 8px; }
.topnav a:hover { color: var(--green-deep); background: var(--mint-soft); }
.topnav a.active { color: var(--green-deep); background: var(--mint-soft); }

/* ---- Buttons: v1's refined pill feel ---- */
.btn { display:inline-flex; align-items:center; gap:8px; font-family: var(--sans); font-weight:600; font-size:0.95rem; padding:13px 26px; border-radius:100px; cursor:pointer; border:1.5px solid transparent; transition: transform .15s ease, background .2s ease, color .2s ease, box-shadow .2s ease; white-space:nowrap; }
.btn-primary { background: var(--amber); color: var(--ink); }
.btn-primary:hover { background: var(--amber-deep); color: var(--ink); transform: translateY(-1px); box-shadow: 0 8px 20px rgba(224,164,88,0.32); }
.btn-green { background: var(--green-deep); color:#fff; }
.btn-green:hover { background: var(--green); color:#fff; transform: translateY(-1px); box-shadow: 0 8px 20px rgba(11,93,18,0.24); }
.btn-dark { background: var(--ink); color:#fff; }
.btn-dark:hover { background: var(--green-deep); color:#fff; transform: translateY(-1px); }
.btn-ghost { border-color: var(--green); color: var(--green-deep); background: transparent; }
.btn-ghost:hover { background: var(--green); color:#fff; }
.btn-join { padding: 10px 20px; }

.nav-toggle { display:none; background:none; border:none; cursor:pointer; padding:6px; }
.nav-toggle span { display:block; width:22px; height:2px; background:var(--ink); margin:5px 0; border-radius:2px; transition:.3s; }

/* ---- Docs shell with sidebar (v2 structure) ---- */
.shell { display: grid; grid-template-columns: var(--sidebar) 1fr; max-width: 1340px; margin: 0 auto; }
.sidebar { position: sticky; top: 66px; align-self: start; height: calc(100vh - 66px); overflow-y: auto; border-right: 1px solid var(--line); padding: 30px 20px 40px; background: var(--ground); }
.sidebar .navgroup { margin-bottom: 26px; }
.sidebar .navgroup > .label { font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.13em; color: var(--muted); font-weight:600; margin-bottom: 10px; display:flex; align-items:center; gap:7px;}
.sidebar .navgroup > .label .n { color: var(--green); }
.sidebar a { display:block; font-size: 0.9rem; color: var(--slate); padding: 6px 12px; border-radius: 7px; margin-bottom:1px; border-left: 2px solid transparent;}
.sidebar a:hover { background: var(--mint-soft); color: var(--green-deep); }
.sidebar a.active { background: var(--mint-soft); color: var(--green-deep); font-weight:600; border-left-color: var(--green); }
.content { min-width: 0; padding: 0 0 80px; }
.content-inner { max-width: 820px; margin: 0 auto; padding: 0 40px; }

/* ---- Hero with v1's tucked loop circle ---- */
.hero { padding: 80px 0 40px; position: relative; overflow: hidden; }
.hero .wrap { position: relative; z-index: 2; }
.hero-grid { display:grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items:center; }
.hero h1 { margin-bottom: 1.2rem; max-width: 15ch; }
.hero .lead { max-width: 52ch; margin-bottom: 2rem; }
.hero-cta { display:flex; gap:14px; flex-wrap:wrap; }
.hero-stats { display:flex; gap: 30px; margin-top: 2.6rem; padding-top: 1.6rem; border-top: 1px solid var(--line); }
.hero-stats .stat .num { font-family: var(--serif); font-size: 1.8rem; font-weight:600; color: var(--green-deep); }
.hero-stats .stat .lbl { font-family: var(--mono); font-size: 0.7rem; text-transform:uppercase; letter-spacing:0.1em; color: var(--muted); }
/* v1's tucked right-side loop */
.hero-visual { position: relative; aspect-ratio: 1; display:grid; place-items:center; }
.hero-loop { width: 100%; max-width: 460px; opacity: 0.92; }

section { padding: 60px 0; }
.section-head { max-width: 62ch; margin-bottom: 2.4rem; }
.section-tint { background: var(--mint-tint); border-top:1px solid var(--line-2); border-bottom:1px solid var(--line-2); }

/* ---- Domain cards (v2) ---- */
.domain-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:18px; }
.domain-card { background: var(--paper); border:1px solid var(--line); border-radius: var(--r-lg); padding: 26px 24px; transition: all .2s; position:relative; overflow:hidden; display:flex; flex-direction:column; }
.domain-card::before { content:""; position:absolute; top:0; left:0; right:0; height:3px; background: linear-gradient(90deg,var(--green),var(--mint)); opacity:0; transition:opacity .2s;}
.domain-card:hover { border-color: var(--green-300); box-shadow: var(--shadow); transform: translateY(-3px); }
.domain-card:hover::before { opacity:1; }
.domain-card .idx { font-family: var(--mono); font-size:0.72rem; color: var(--green); letter-spacing:0.1em; margin-bottom: 14px; }
.domain-card h3 { margin-bottom: 8px; }
.domain-card p { font-size: 0.94rem; color: var(--muted); margin-bottom: 16px; }
.domain-card .more { margin-top:auto; font-family:var(--mono); font-size:0.78rem; color: var(--green-deep); font-weight:500; }
.domain-card .more::after { content:" →"; }

/* ---- Material cards (v2) ---- */
.mat-grid { display:grid; grid-template-columns: repeat(3,1fr); gap:16px; }
.mat-card { background:var(--paper); border:1px solid var(--line); border-radius: var(--r); padding: 22px; transition: all .2s; display:flex; flex-direction:column; }
.mat-card:hover { border-color: var(--green-300); box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.mat-card .abbr { font-family: var(--serif); font-size: 1.5rem; font-weight:600; color: var(--ink); }
.mat-card .full { font-size: 0.82rem; color: var(--muted); margin-bottom: 12px; }
.mat-card p { font-size:0.88rem; color:var(--slate); margin-bottom:14px; }
.mat-card .more { margin-top:auto; font-family:var(--mono); font-size:0.74rem; color:var(--green-deep); }
.mat-card .more::after { content:" →"; }

.ptag { display:inline-flex; align-items:center; gap:5px; font-family:var(--mono); font-size:0.68rem; font-weight:500; padding:3px 9px; border-radius:20px; letter-spacing:0.02em; margin:2px 3px 2px 0;}
.ptag::before { content:""; width:6px; height:6px; border-radius:50%; }
.ptag.bio { background: #E7F5E9; color: var(--green-700); } .ptag.bio::before{ background:var(--biobased);}
.ptag.fossil { background:#EEF1EF; color:#4A5850;} .ptag.fossil::before{background:var(--fossil);}
.ptag.deg { background:#E5F6EC; color:#0F7A3B;} .ptag.deg::before{background:var(--degrade);}
.ptag.dur { background:#F6EEE6; color:#9A5A2C;} .ptag.dur::before{background:var(--durable);}

/* ---- Data panel (v2) ---- */
.datapanel { background:var(--paper); border:1px solid var(--line); border-radius: var(--r-lg); overflow:hidden; box-shadow: var(--shadow-sm); margin: 26px 0; }
.datapanel-head { background: linear-gradient(135deg, var(--green-deep), var(--green)); color:#fff; padding: 20px 26px; display:flex; justify-content:space-between; align-items:center; gap:14px; flex-wrap:wrap;}
.datapanel-head h3 { color:#fff; font-size:1.4rem; }
.datapanel-head .formula { font-family: var(--mono); font-size:0.9rem; color: var(--mint); background: rgba(255,255,255,0.12); padding:4px 12px; border-radius:6px; }
.drow { display:grid; grid-template-columns: 190px 1fr; border-top:1px solid var(--line-2); }
.drow:first-child { border-top:none; }
.dkey { background: var(--mint-tint); font-family:var(--mono); font-size:0.74rem; text-transform:uppercase; letter-spacing:0.06em; color: var(--green-700); padding:15px 22px; font-weight:600; }
.dval { padding:15px 22px; font-size:0.94rem; color:var(--slate); }

.proptable { width:100%; border-collapse:collapse; margin: 22px 0; font-size:0.9rem; background:var(--paper); border:1px solid var(--line); border-radius:var(--r); overflow:hidden;}
.proptable caption { text-align:left; font-family:var(--mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.1em; color:var(--muted); padding:0 0 10px; caption-side:top; }
.proptable thead th { background: var(--green-deep); color:#fff; font-family:var(--mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.06em; font-weight:500; text-align:left; padding:12px 16px;}
.proptable td { padding: 11px 16px; border-top:1px solid var(--line-2); }
.proptable tbody tr:nth-child(even){ background: var(--mint-tint);}
.proptable td:first-child { font-weight:600; color:var(--ink); }
.proptable .unit { font-family:var(--mono); font-size:0.82rem; color:var(--muted); }

.watchout { border-left:4px solid var(--amber); background: #FBF3E5; border-radius:0 10px 10px 0; padding:18px 24px; margin: 24px 0; }
.watchout .label { font-family:var(--mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.12em; color:var(--amber-deep); font-weight:600; margin-bottom:6px; display:flex; align-items:center; gap:8px;}
.watchout p { margin-bottom:0; color: #6E5223; font-size:0.94rem; }
.watchout p strong { color: var(--amber-deep); }

.callout { background: var(--mint-soft); border:1px solid #CDEBD6; border-radius: var(--r); padding:18px 22px; margin: 22px 0; }
.callout .label { font-family:var(--mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.1em; color: var(--green-deep); font-weight:600; margin-bottom:6px; }
.callout p { margin-bottom:0; font-size:0.94rem; }

.keyfact { background:var(--paper); border:1px solid var(--line); border-left:4px solid var(--green); border-radius:0 10px 10px 0; padding:16px 22px; margin:20px 0; }
.keyfact .label { font-family:var(--mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.1em; color:var(--green-deep); font-weight:600; margin-bottom:5px; display:block; }
.keyfact p { margin-bottom:0; font-size:0.95rem; color:var(--slate); }

.prose { max-width: 74ch; }
.prose h2 { margin: 2.6rem 0 1rem; padding-top: 0.4rem; }
.prose h3 { margin: 2rem 0 0.7rem; }
.prose ul, .prose ol { margin: 0 0 1.3rem 1.3rem; }
.prose li { margin-bottom: 0.55rem; }
.prose > p:first-of-type { font-size: 1.08rem; }

.page-hero { padding: 46px 0 34px; border-bottom:1px solid var(--line); background: var(--paper); }
.crumb { font-family:var(--mono); font-size:0.76rem; color:var(--muted); margin-bottom:14px; letter-spacing:0.03em;}
.crumb a { color:var(--muted);} .crumb a:hover{color:var(--green);}

.cta-band { background: linear-gradient(135deg, var(--green-deep), var(--green)); border-radius: var(--r-lg); padding: 46px; text-align:center; color:#fff; position:relative; overflow:hidden;}
.cta-band h2 { color:#fff; margin-bottom:12px; }
.cta-band p { color: rgba(255,255,255,0.9); max-width:48ch; margin:0 auto 24px; }
.cta-band .eyebrow { color: var(--mint); } .cta-band .eyebrow::before{ background:var(--mint);}

.site-foot { background: var(--ink); color:#A7B8AC; padding: 54px 0 30px; font-size:0.9rem; }
.site-foot a { color:#C9D8CD; } .site-foot a:hover{ color: var(--mint);}
.foot-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:32px; margin-bottom:38px;}
.foot-brand { font-family:var(--serif); font-size:1.3rem; color:#fff; margin-bottom:10px; display:flex; align-items:center; gap:9px;}
.foot-col h4 { font-family:var(--mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.12em; color:var(--mint); margin-bottom:13px; font-weight:500;}
.foot-col a { display:block; margin-bottom:9px; }
.foot-bottom { border-top:1px solid #22332A; padding-top:20px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:0.8rem; color:#7B8C80;}
.foot-bottom .mono{ font-family:var(--mono);}

.sourcenote { font-family:var(--mono); font-size:0.76rem; color:var(--muted); border-top:1px dashed var(--line); padding-top:16px; margin-top:34px; line-height:1.6;}

@media (max-width: 1080px){ .domain-grid{grid-template-columns:repeat(2,1fr);} .mat-grid{grid-template-columns:repeat(2,1fr);} }
@media (max-width: 940px){
  .shell{ grid-template-columns:1fr; }
  .sidebar{ display:none; }
  .content-inner{ padding:0 28px; }
  .hero-grid{ grid-template-columns:1fr; } .hero-visual{ max-width:320px; margin:0 auto; opacity:0.5; }
}
@media (max-width: 720px){
  body{ font-size:16px; }
  .topnav{ position:fixed; inset:66px 0 auto 0; background:#fff; flex-direction:column; align-items:stretch; padding:14px 20px; gap:4px; border-bottom:1px solid var(--line); transform:translateY(-130%); transition:transform .3s; box-shadow: var(--shadow);}
  .topnav.open{ transform:translateY(0);}
  .nav-toggle{ display:block; }
  .domain-grid,.mat-grid{ grid-template-columns:1fr; }
  .drow{ grid-template-columns:1fr; } .dkey{ border-bottom:1px solid var(--line-2);}
  .foot-grid{ grid-template-columns:1fr 1fr; }
  .hero-stats{ gap:20px; flex-wrap:wrap;}
  .cta-band{ padding:32px 22px; }
  .proptable{ font-size:0.82rem; } .proptable td,.proptable th{ padding:9px 10px;}
}
@media (prefers-reduced-motion: reduce){ *{ animation:none!important; transition:none!important; scroll-behavior:auto;} }
a:focus-visible,.btn:focus-visible,button:focus-visible{ outline:3px solid var(--amber); outline-offset:2px; border-radius:4px;}

/* ============================================================
   Compatibility styles for content pages (spec sheets, termbox,
   CTA sections) — mapped to the v2 green-white palette
   ============================================================ */

/* material spec sheet — reuse datapanel look */
.spec { background:var(--paper); border:1px solid var(--line); border-radius:var(--r-lg); overflow:hidden; box-shadow:var(--shadow-sm); margin:26px 0; }
.spec-head { background: linear-gradient(135deg,var(--green-deep),var(--green)); color:#fff; padding:20px 26px; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:10px; }
.spec-head h3 { color:#fff; font-size:1.4rem; }
.spec-head .formula { font-family:var(--mono); font-size:0.9rem; color:var(--mint); background:rgba(255,255,255,0.12); padding:4px 12px; border-radius:6px; }
.spec-row { display:grid; grid-template-columns:190px 1fr; border-top:1px solid var(--line-2); }
.spec-row:first-child { border-top:none; }
.spec-key { background:var(--mint-tint); font-family:var(--mono); font-size:0.74rem; text-transform:uppercase; letter-spacing:0.06em; color:var(--green-700); padding:15px 22px; font-weight:600; }
.spec-val { padding:15px 22px; font-size:0.94rem; color:var(--slate); }
.spec-val .chip { display:inline-block; font-family:var(--mono); font-size:0.72rem; background:var(--mint-tint); border:1px solid var(--line); border-radius:6px; padding:3px 9px; margin:2px 4px 2px 0; color:var(--green-700); }

/* termbox -> callout look */
.termbox { background:var(--mint-soft); border:1px solid #CDEBD6; border-radius:var(--r); padding:18px 22px; margin:22px 0; }
.termbox .label { font-family:var(--mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.1em; color:var(--green-deep); font-weight:600; margin-bottom:5px; display:block; }

/* legacy CTA section -> render as the green cta-band */
.section-dark { background: linear-gradient(135deg,var(--green-deep),var(--green)); color:#fff; border-radius:0; }
.section-dark h2 { color:#fff; }
.section-dark p { color:rgba(255,255,255,0.9); }
.section-dark .btn-primary { background:var(--amber); color:var(--ink); }
.section-dark .btn-primary:hover { background:var(--amber-deep); }

/* interior page hero on content pages */
.page-hero .eyebrow { color:var(--green); }

@media (max-width:680px){ .spec-row{ grid-template-columns:1fr; } .spec-key{ border-bottom:1px solid var(--line-2);} }

/* Landscape feature block with episode map */
.landscape-feature { display:grid; grid-template-columns:0.85fr 1.15fr; gap:34px; align-items:center; }
.landscape-feature svg { width:100%; height:auto; display:block; }
@media (max-width:900px){ .landscape-feature{ grid-template-columns:1fr; gap:24px; } }