:root{
  --bg:#f3e3c5;
  --bg-2:#ead6ad;
  --card:#fff9ee;
  --card-muted:#f8edd9;
  --teal:#387d84;
  --teal-hover:#2c6167;
  --teal-alt:#478071;
  --text:#171717;
  --muted:#5f574a;
  --border:rgba(23,23,23,0.12);
  --border-strong:rgba(56,125,132,0.32);
  --amber:#9a6200;
  --red:#9f2d20;
  --green:#478071;
  --maxw:1040px;
  --radius:14px;
  --shadow:0 1px 2px rgba(23,23,23,0.04), 0 8px 24px rgba(23,23,23,0.05);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:"DM Sans",system-ui,sans-serif;font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-family:"DM Serif Display",Georgia,serif;font-weight:400;line-height:1.12;margin:0 0 .4em;letter-spacing:-.01em;}
h1{font-size:clamp(2rem,6vw,3.3rem);}
.hero h1{font-size:clamp(1.85rem,5.2vw,2.9rem);}
h2{font-size:clamp(1.55rem,4vw,2.3rem);}
h3{font-size:clamp(1.12rem,2.4vw,1.3rem);}
p{margin:0 0 1em;}
a{color:var(--teal);}
a:hover{color:var(--teal-hover);}
img{max-width:100%;}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
main section{padding:56px 0;}
.section-intro{max-width:680px;color:var(--muted);font-size:1.05rem;}
.eyebrow{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);margin-bottom:14px;}

.skip{position:absolute;left:-9999px;top:0;background:var(--teal);color:#fff;padding:10px 16px;border-radius:8px;z-index:200;}
.skip:focus{left:12px;top:12px;}

#progress-track{position:fixed;top:0;left:0;right:0;height:4px;background:rgba(56,125,132,.15);z-index:120;}
#progress-fill{height:100%;width:0;background:var(--teal);transition:width .15s linear;}

/* header */
header{position:sticky;top:0;z-index:100;background:rgba(243,227,197,.92);backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid var(--border);}
.nav{display:flex;align-items:center;gap:16px;height:62px;}
.brand{display:flex;flex-direction:column;line-height:1.05;margin-right:auto;text-decoration:none;color:var(--text);}
.brand b{font-family:"DM Serif Display",serif;font-size:1.22rem;font-weight:400;color:var(--teal);}
.brand span{font-size:.72rem;color:var(--muted);letter-spacing:.04em;}
.nav-links{display:none;gap:4px;align-items:center;}
.nav-links a{text-decoration:none;color:var(--text);padding:8px 12px;border-radius:8px;font-weight:500;font-size:.96rem;}
.nav-links a:hover{background:var(--card-muted);color:var(--teal-hover);}
.nav-links a[aria-current="page"]{color:var(--teal);background:var(--card-muted);}
.btn{font:inherit;font-weight:600;cursor:pointer;border:1px solid transparent;border-radius:10px;padding:11px 18px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;transition:background .15s ease,border-color .15s ease,color .15s ease;}
.btn-primary{background:var(--teal);color:#fff;}
.btn-primary:hover{background:var(--teal-hover);color:#fff;}
.btn-ghost{background:transparent;color:var(--teal);border-color:var(--border-strong);}
.btn-ghost:hover{background:var(--card-muted);color:var(--teal-hover);}
.btn-small{min-height:40px;padding:8px 14px;font-size:.92rem;}

/* mobile menu button */
.menu-btn{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border:1px solid var(--border-strong);background:transparent;border-radius:10px;cursor:pointer;color:var(--teal);}
.mobile-nav{display:none;border-top:1px solid var(--border);background:var(--bg);}
.mobile-nav.open{display:block;}
.mobile-nav a{display:block;padding:14px 20px;text-decoration:none;color:var(--text);font-weight:500;border-bottom:1px solid var(--border);}
.mobile-nav a:hover{background:var(--card-muted);}

/* settings strip */
.strip{background:var(--bg-2);border-bottom:1px solid var(--border);}
.strip-in{display:flex;align-items:center;gap:12px;padding:10px 0;}
.strip .label{font-weight:600;font-size:.9rem;}
.strip .desc{font-size:.8rem;color:var(--muted);}
.switch{position:relative;flex:0 0 auto;width:48px;height:27px;}
.switch input{opacity:0;width:0;height:0;}
.slider{position:absolute;inset:0;background:rgba(23,23,23,.22);border-radius:999px;transition:background .2s ease;cursor:pointer;}
.slider:before{content:"";position:absolute;height:21px;width:21px;left:3px;top:3px;background:#fff;border-radius:50%;transition:transform .2s ease;box-shadow:0 1px 2px rgba(0,0,0,.25);}
.switch input:checked + .slider{background:var(--teal);}
.switch input:checked + .slider:before{transform:translateX(21px);}
.switch input:focus-visible + .slider{outline:3px solid var(--teal-hover);outline-offset:2px;}

/* hero */
.hero{padding-top:52px;}
.hero h1{max-width:none;}
.hero .sub{font-size:1.15rem;color:var(--muted);max-width:58ch;margin-bottom:10px;}
.hero .tiny{font-size:.95rem;color:var(--teal-alt);font-weight:600;margin-bottom:24px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:6px;}

.fact-cards{display:grid;gap:14px;grid-template-columns:1fr;margin-top:30px;}
.fact{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);}
.fact .k{font-size:.72rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--teal);}
.fact .v{font-family:"DM Serif Display",serif;font-size:1.2rem;margin-top:4px;}

/* explore nav cards */
.explore{display:grid;gap:16px;grid-template-columns:1fr;margin-top:8px;}
.navcard{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;text-decoration:none;color:var(--text);box-shadow:var(--shadow);transition:border-color .15s ease,transform .15s ease;}
.navcard:hover{border-color:var(--border-strong);color:var(--text);transform:translateY(-2px);}
.navcard .tag{margin-bottom:12px;}
.navcard h3{font-family:"DM Serif Display",serif;font-weight:400;margin:0 0 .3em;}
.navcard p{color:var(--muted);font-size:.96rem;margin:0 0 14px;}
.navcard .go{margin-top:auto;color:var(--teal);font-weight:600;font-size:.92rem;display:inline-flex;align-items:center;gap:6px;}

/* page intro / breadcrumb */
.page-top{padding-top:46px;padding-bottom:8px;}
.back-link{display:inline-flex;align-items:center;gap:6px;font-size:.9rem;font-weight:600;text-decoration:none;color:var(--teal);margin-bottom:20px;}
.back-link:hover{color:var(--teal-hover);}

/* labels */
.tag{display:inline-block;font-size:.68rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:4px 9px;border-radius:999px;border:1px solid var(--border-strong);color:var(--teal);background:var(--card-muted);}
.tag.proves{color:var(--green);border-color:rgba(71,128,113,.4);}
.tag.notproves{color:var(--amber);border-color:rgba(154,98,0,.35);}

/* steps */
.steps{display:grid;gap:14px;grid-template-columns:1fr;margin-top:8px;}
.step{display:flex;gap:16px;align-items:flex-start;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;}
.step .num{flex:0 0 auto;width:36px;height:36px;border-radius:50%;background:var(--teal);color:#fff;font-family:"DM Serif Display",serif;font-size:1.15rem;display:flex;align-items:center;justify-content:center;}
.step h3{margin-bottom:.2em;font-family:"DM Sans",sans-serif;font-weight:700;font-size:1.05rem;}
.step p{margin:0;color:var(--muted);font-size:.97rem;}

/* evidence grid */
.grid{display:grid;gap:16px;grid-template-columns:1fr;margin-top:8px;}
.ev{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;}
.ev-head{width:100%;text-align:left;background:none;border:none;font:inherit;cursor:pointer;padding:20px;display:block;color:var(--text);}
.ev-head:hover{background:var(--card-muted);}
.ev-head .tag{margin-bottom:10px;}
.ev-head h3{font-family:"DM Serif Display",serif;font-weight:400;margin:0 0 .3em;}
.ev-head .sum{color:var(--muted);margin:0;font-size:.97rem;}
.ev-head .more{display:inline-flex;align-items:center;gap:6px;margin-top:12px;color:var(--teal);font-weight:600;font-size:.9rem;}
.ev-head .chev{transition:transform .2s ease;}
.ev-head[aria-expanded="true"] .chev{transform:rotate(180deg);}
.ev-body{padding:0 20px;max-height:0;overflow:hidden;transition:max-height .28s ease;}
.ev-body-inner{padding:4px 0 22px;border-top:1px solid var(--border);}
.ev-body p{font-size:.97rem;}
.proof{display:grid;gap:10px;margin-top:14px;}
.proof div{background:var(--card-muted);border:1px solid var(--border);border-radius:10px;padding:12px 14px;}
.proof .tag{margin-bottom:6px;}
.proof p{margin:0;font-size:.92rem;color:var(--muted);}

/* arguments + generic accordion */
.acc{display:grid;gap:12px;margin-top:8px;}
.q{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;}
.q-head{width:100%;text-align:left;background:none;border:none;font:inherit;cursor:pointer;color:var(--text);padding:18px 20px;display:flex;gap:14px;align-items:flex-start;justify-content:space-between;}
.q-head:hover{background:var(--card-muted);}
.q-head .qt{font-weight:600;font-size:1.02rem;}
.q-head .chev{flex:0 0 auto;color:var(--teal);transition:transform .2s ease;margin-top:2px;}
.q-head[aria-expanded="true"] .chev{transform:rotate(180deg);}
.q-body{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 20px;}
.q-body-inner{padding:2px 0 20px;border-top:1px solid var(--border);}
.q-body .row{margin-top:12px;}
.q-body .row .lbl{font-size:.7rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--teal);display:block;margin-bottom:2px;}
.q-body .row p{margin:0;font-size:.95rem;color:var(--muted);}
.bottom-line{margin-top:14px;background:var(--card-muted);border:1px solid var(--border-strong);border-radius:10px;padding:12px 14px;}
.bottom-line .lbl{color:var(--teal-hover);}
.bottom-line p{color:var(--text);font-weight:500;}

/* evidence chain */
.chain{display:grid;gap:10px;margin-top:8px;}
.link{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;}
.link-head{width:100%;text-align:left;background:none;border:none;font:inherit;cursor:pointer;color:var(--text);padding:16px 18px;display:flex;align-items:center;gap:14px;}
.link-head:hover{background:var(--card-muted);}
.link-head .dot{flex:0 0 auto;width:10px;height:10px;border-radius:50%;background:var(--teal);}
.link-head .lt{font-weight:600;flex:1;}
.link-head .chev{color:var(--teal);transition:transform .2s ease;}
.link-head[aria-expanded="true"] .chev{transform:rotate(180deg);}
.link-arrow{display:flex;justify-content:center;color:var(--teal-alt);font-size:1.1rem;line-height:0;}
.link-body{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 18px;}
.link-body-inner{padding:2px 0 18px 24px;border-top:1px solid var(--border);}
.link-body p{margin:10px 0 0;color:var(--muted);font-size:.95rem;}

/* prose blocks (cycles page) */
.prose{max-width:720px;}
.prose p{font-size:1.02rem;}
.note{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--teal);border-radius:10px;padding:16px 18px;margin:0 0 22px;}
.note p{margin:0;font-size:.98rem;}
.block{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-bottom:18px;box-shadow:var(--shadow);}
.block h3{font-family:"DM Sans",sans-serif;font-weight:700;font-size:1.1rem;margin-bottom:.4em;}
.block p:last-child{margin-bottom:0;}

/* comparison table */
.cmp-wrap{overflow-x:auto;margin:8px 0 22px;}
.cmp{width:100%;border-collapse:collapse;min-width:520px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;}
.cmp caption{text-align:left;color:var(--muted);font-size:.9rem;padding:0 0 10px;}
.cmp th,.cmp td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--border);vertical-align:top;font-size:.95rem;}
.cmp thead th{background:var(--card-muted);font-weight:700;font-size:.82rem;letter-spacing:.04em;text-transform:uppercase;color:var(--teal);}
.cmp tbody th{font-weight:600;color:var(--text);width:30%;}
.cmp tr:last-child td,.cmp tr:last-child th{border-bottom:none;}
.cmp td.now{color:var(--text);}
.cmp td.past{color:var(--muted);}

/* mini cards */
.cardlist{display:grid;gap:12px;grid-template-columns:1fr;margin-top:8px;}
.mini{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px 18px;}
.mini.assert{background:var(--card-muted);border-color:var(--border-strong);}
.mini p{margin:0;font-size:.97rem;}
.mini.assert p{font-weight:600;}

/* change my mind */
.cmm{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);}
.cmm ul{margin:0 0 18px;padding-left:0;list-style:none;display:grid;gap:10px;}
.cmm li{padding-left:28px;position:relative;color:var(--muted);font-size:.97rem;}
.cmm li:before{content:"";position:absolute;left:4px;top:9px;width:8px;height:8px;border:2px solid var(--teal);border-radius:50%;}
.cmm .concl{margin:0;padding:14px 16px;background:var(--card-muted);border:1px solid var(--border-strong);border-radius:10px;font-weight:500;}

/* summary / copy */
.summary{background:var(--card);border:1px solid var(--border-strong);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);}
.summary p{font-size:1.08rem;}
.copy-wrap{display:flex;align-items:center;gap:14px;flex-wrap:wrap;}
.copied{color:var(--green);font-weight:600;font-size:.92rem;opacity:0;transition:opacity .2s ease;}
.copied.show{opacity:1;}

/* sources */
.sources{display:grid;gap:14px;grid-template-columns:1fr;margin-top:8px;}
.src{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;}
.src h3{font-family:"DM Sans",sans-serif;font-weight:700;font-size:1.05rem;margin-bottom:.3em;}
.src p{color:var(--muted);font-size:.94rem;flex:1;}
.src a{align-self:flex-start;text-decoration:none;}

/* footer */
footer{background:var(--bg-2);border-top:1px solid var(--border);padding:46px 0 56px;margin-top:24px;}
footer p{color:var(--muted);font-size:.92rem;max-width:760px;}
.foot-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.foot-links a{background:none;border:1px solid var(--border);border-radius:8px;color:var(--text);text-decoration:none;padding:8px 14px;min-height:40px;display:inline-flex;align-items:center;}
.foot-links a:hover{background:var(--card);color:var(--teal-hover);}
.disclaimer{margin-top:24px;font-size:.82rem;color:var(--muted);}

#totop{position:fixed;right:16px;bottom:16px;z-index:90;opacity:0;pointer-events:none;transition:opacity .2s ease;background:var(--teal);color:#fff;border:none;border-radius:50%;width:48px;height:48px;cursor:pointer;box-shadow:var(--shadow);font-size:1.2rem;}
#totop.show{opacity:1;pointer-events:auto;}
#totop:hover{background:var(--teal-hover);}

:focus-visible{outline:3px solid var(--teal-hover);outline-offset:2px;border-radius:6px;}

@media(min-width:600px){
  .fact-cards{grid-template-columns:repeat(3,1fr);}
  .cardlist{grid-template-columns:repeat(2,1fr);}
  .explore{grid-template-columns:repeat(2,1fr);}
}
@media(min-width:760px){
  .nav-links{display:flex;}
  .menu-btn{display:none;}
  .grid{grid-template-columns:repeat(2,1fr);}
  .sources{grid-template-columns:repeat(2,1fr);}
  .proof{grid-template-columns:1fr 1fr;}
}
@media(min-width:1000px){
  .grid{grid-template-columns:repeat(3,1fr);}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{transition:none !important;}
}

/* CO2 vs temperature chart */
.chart-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-top:8px;}
.chart-legend{display:flex;flex-wrap:wrap;gap:18px;margin-bottom:14px;}
.chart-legend .lg{display:inline-flex;align-items:center;gap:8px;font-size:.88rem;color:var(--muted);font-weight:500;}
.chart-legend .sw{width:22px;height:4px;border-radius:2px;display:inline-block;flex:0 0 auto;}
.sw-co2{background:#387d84;}
.sw-temp{background:#9f2d20;}
.chart-plot-wrap{position:relative;width:100%;}
#co2temp-plot{width:100%;outline:none;touch-action:pan-y;}
#co2temp-plot:focus-visible{outline:3px solid var(--teal-hover);outline-offset:3px;border-radius:8px;}
.chart-tooltip{position:absolute;pointer-events:none;background:#fff9ee;border:1px solid var(--border-strong);border-radius:10px;padding:8px 11px;font-size:.82rem;line-height:1.4;box-shadow:var(--shadow);opacity:0;transition:opacity .12s ease;white-space:nowrap;z-index:5;}
.chart-tooltip.show{opacity:1;}
.chart-tooltip b{font-weight:700;display:block;margin-bottom:2px;}
.chart-tooltip .tc{color:#387d84;font-weight:600;}
.chart-tooltip .tt{color:#9f2d20;font-weight:600;}
.chart-note{font-size:.82rem;color:var(--muted);margin:14px 0 0;}
.sr-only-table{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
@media(prefers-reduced-motion:reduce){.chart-tooltip{transition:none;}}

/* header search + breadcrumbs + mega footer + related + search page */
.search-link{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--border-strong);border-radius:10px;color:var(--teal);text-decoration:none;}
.search-link:hover{background:var(--card-muted);color:var(--teal-hover);}
.crumbs{background:var(--bg-2);border-bottom:1px solid var(--border);}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:10px 0;font-size:.84rem;}
.crumbs li{display:flex;align-items:center;gap:6px;color:var(--muted);}
.crumbs li:not(:last-child):after{content:"/";color:var(--muted);opacity:.6;margin-left:6px;}
.crumbs a{color:var(--teal);text-decoration:none;}
.crumbs a:hover{text-decoration:underline;}
.crumbs li[aria-current="page"]{color:var(--text);font-weight:600;}

.footer-mega{display:grid;grid-template-columns:1fr;gap:24px;margin-bottom:28px;padding-bottom:28px;border-bottom:1px solid var(--border);}
.fcol h3{font-family:"DM Sans",sans-serif;font-weight:700;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--teal);margin:0 0 10px;}
.fcol ul{list-style:none;margin:0;padding:0;display:grid;gap:7px;}
.fcol a{color:var(--text);text-decoration:none;font-size:.92rem;}
.fcol a:hover{color:var(--teal-hover);text-decoration:underline;}

.rel-grid{display:grid;grid-template-columns:1fr;gap:10px;margin-top:8px;}
.rel-card{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:15px 18px;text-decoration:none;color:var(--text);font-weight:600;font-size:.97rem;transition:border-color .15s ease,transform .15s ease;}
.rel-card:hover{border-color:var(--border-strong);color:var(--text);transform:translateY(-2px);}
.rel-card .arr{color:var(--teal);}

#site-search{width:100%;max-width:560px;font:inherit;padding:14px 16px;border:1px solid var(--border-strong);border-radius:12px;background:var(--card);margin-top:6px;}
#site-search:focus-visible{outline:3px solid var(--teal-hover);outline-offset:2px;}
.search-results{margin-top:20px;display:grid;gap:10px;}
.search-results a{display:block;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px 16px;text-decoration:none;color:var(--text);}
.search-results a:hover{border-color:var(--border-strong);}
.search-results a b{display:block;color:var(--teal);font-weight:700;margin-bottom:3px;}
.search-results a span{font-size:.9rem;color:var(--muted);}
.search-empty{color:var(--muted);}

@media(min-width:600px){.footer-mega{grid-template-columns:repeat(2,1fr);} .rel-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:900px){.footer-mega{grid-template-columns:repeat(3,1fr);} .rel-grid{grid-template-columns:repeat(3,1fr);}}

/* Brocklesby AI credit */
.built-by{font-size:.9rem;color:var(--text);font-weight:500;padding:12px 0 4px;border-top:1px solid var(--border);margin-top:4px;}
.built-by a{color:var(--teal);text-decoration:none;font-weight:600;}
.built-by a:hover{color:var(--teal-hover);text-decoration:underline;}
.brand span{white-space:nowrap;}