/* The public website (landing.html). Design from the CarbonLedger website artifact: Instrument Serif display,
   IBM Plex text and numbers, ruled ledger lines behind each section. */
/* Layout: a single long ledger page — ruled lines run behind every section, numbers set in mono like entries in a book of account. */
:root{
  --bg:#07090A; --surface:#0C1210; --card:#101810;
  --line:rgba(46,204,128,.16); --line-strong:rgba(46,204,128,.38);
  --fg:#EDF3EF; --muted:#8FB39C; --dim:#668a76;   /* lifted from #557363 so small print passes 4.5:1 on every surface */
  --accent:#2ECC80; --accent-deep:#1E6B4F; --accent-wash:rgba(30,107,79,.16);
  --warn:#E8A040;
  --f-display:"Instrument Serif",Georgia,"Times New Roman",serif;
  --f-body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --gutter:clamp(16px,4vw,48px); --maxw:1160px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font-family:var(--f-body);font-size:16px;line-height:1.6;margin:0;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:var(--accent)}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:var(--gutter)}
.mono{font-family:var(--f-mono)}
.eyebrow{font-family:var(--f-mono);font-size:.75rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
h1,h2,h3{font-family:var(--f-display);font-weight:400;text-wrap:balance;margin:0;line-height:1.05}
h2{font-size:clamp(2rem,4.6vw,3.4rem);letter-spacing:-.01em}
h2 em,h1 em{color:var(--accent)}
h3{font-size:1.5rem}
p{margin:0;max-width:65ch}
.lede{color:var(--muted);font-size:1.08rem}

/* nav */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(7,9,10,.78);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:12px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--fg);font-weight:600;letter-spacing:.01em}
.brand svg{width:30px;height:30px}
.nav-links{display:flex;gap:22px;font-size:.9rem}
.nav-links a{color:var(--muted);text-decoration:none}
.nav-links a:hover{color:var(--fg)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border-radius:999px;font-weight:600;font-size:.92rem;text-decoration:none;border:1px solid var(--line-strong);color:var(--fg);background:transparent;transition:background .2s,border-color .2s,transform .2s}
.btn:hover{border-color:var(--accent);transform:translateY(-1px)}
.btn.primary{background:var(--accent);color:#04140B;border-color:var(--accent)}
.btn.primary:hover{background:#4BDB95}
@media (max-width:820px){.nav-links{display:none}}

/* hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
#field{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(ellipse at 20% 40%,transparent 0,rgba(7,9,10,.55) 60%,var(--bg) 100%);pointer-events:none}
.hero .wrap{position:relative;z-index:2;padding-block:clamp(72px,12vw,150px) clamp(56px,8vw,96px);display:grid;gap:28px}
.hero h1{font-size:clamp(3rem,9vw,7.6rem);letter-spacing:-.025em;max-width:13ch}
.hero .lede{font-size:clamp(1.05rem,1.6vw,1.25rem);max-width:56ch}
.cta-row{display:flex;flex-wrap:wrap;gap:12px}
.unit{display:inline-flex;flex-wrap:wrap;gap:8px 18px;font-family:var(--f-mono);font-size:.82rem;color:var(--muted)}
.unit b{color:var(--fg);font-weight:500}
.reveal{animation:rise .9s cubic-bezier(.2,.7,.2,1) both}
.reveal.d1{animation-delay:.12s}.reveal.d2{animation-delay:.24s}.reveal.d3{animation-delay:.36s}
@keyframes rise{from{transform:translateY(18px);opacity:.001}to{transform:none;opacity:1}}

/* live strip */
.live{background:var(--surface);border-bottom:1px solid var(--line)}
.live .wrap{padding-block:28px;display:grid;gap:18px}
.live-head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px}
.pill{display:inline-flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:.75rem;padding:5px 11px;border-radius:999px;border:1px solid var(--line-strong);color:var(--muted)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 rgba(46,204,128,.6);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(46,204,128,.55)}70%{box-shadow:0 0 0 9px rgba(46,204,128,0)}100%{box-shadow:0 0 0 0 rgba(46,204,128,0)}}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.stat{background:var(--bg);padding:18px 18px 16px;display:grid;gap:4px}
.stat .n{font-family:var(--f-mono);font-size:clamp(1.6rem,3.4vw,2.3rem);color:var(--fg);font-variant-numeric:tabular-nums;line-height:1.1}
.stat .n small{font-size:.5em;color:var(--muted)}
.stat .l{font-size:.82rem;color:var(--muted)}
@media (max-width:720px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}}
.live-links{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:.88rem}
.live-note{font-size:.8rem;color:var(--dim);font-family:var(--f-mono)}

/* sections */
section.block{padding-block:clamp(72px,10vw,128px);border-bottom:1px solid var(--line);position:relative}
.ruled{background-image:repeating-linear-gradient(to bottom,transparent 0,transparent 47px,var(--line) 47px,var(--line) 48px)}
.head{display:grid;gap:16px;margin-bottom:clamp(36px,5vw,56px);max-width:760px}

/* problem */
.problems{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px)}
.problem{display:grid;gap:10px;align-content:start;border-top:1px solid var(--line-strong);padding-top:18px}
.problem h3{font-size:1.6rem}
.problem p{color:var(--muted)}
@media (max-width:820px){.problems{grid-template-columns:1fr}}

/* how it works */
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;counter-reset:s;border:1px solid var(--line);background:var(--surface)}
.step{padding:26px 22px;display:grid;gap:10px;align-content:start;border-right:1px solid var(--line);position:relative}
.step:last-child{border-right:0}
.step .k{font-family:var(--f-mono);font-size:.75rem;color:var(--accent)}
.step h3{font-size:1.45rem}
.step p{color:var(--muted);font-size:.95rem}
.step .arrow{position:absolute;right:-11px;top:30px;width:22px;height:22px;border-radius:50%;background:var(--bg);border:1px solid var(--line-strong);display:grid;place-items:center;color:var(--accent);font-size:.8rem;z-index:1}
.step:last-child .arrow{display:none}
@media (max-width:900px){.steps{grid-template-columns:1fr 1fr}.step:nth-child(2){border-right:0}.step:nth-child(-n+2){border-bottom:1px solid var(--line)}.step .arrow{display:none}}
@media (max-width:560px){.steps{grid-template-columns:1fr}.step{border-right:0;border-bottom:1px solid var(--line)}.step:last-child{border-bottom:0}}
.equation{margin-top:28px;font-family:var(--f-mono);font-size:clamp(.85rem,1.6vw,1rem);color:var(--muted);display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center}
.equation b{color:var(--fg);font-weight:500;padding:6px 10px;border:1px solid var(--line-strong);border-radius:6px;background:var(--accent-wash)}

/* everyday */
.split{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:clamp(28px,5vw,64px);align-items:start}
@media (max-width:900px){.split{grid-template-columns:1fr}}
.uses{display:grid;gap:0;border-top:1px solid var(--line)}
.use{display:grid;grid-template-columns:44px minmax(0,1fr);gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
.use svg{width:28px;height:28px;stroke:var(--accent);fill:none;stroke-width:1.6}
.use h3{font-family:var(--f-body);font-size:1.05rem;font-weight:600;margin-bottom:4px}
.use p{color:var(--muted);font-size:.95rem}
.calc{background:var(--card);border:1px solid var(--line-strong);border-radius:14px;padding:clamp(20px,3vw,30px);display:grid;gap:18px}
.calc label{font-size:.85rem;color:var(--muted)}
.calc input[type=range]{width:100%;accent-color:var(--accent)}
.calc .row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.calc .big{font-family:var(--f-mono);font-size:clamp(1.9rem,4vw,2.6rem);font-variant-numeric:tabular-nums}
.calc .clt{font-family:var(--f-mono);color:var(--accent);font-size:.95rem;font-variant-numeric:tabular-nums}
.presets{display:flex;flex-wrap:wrap;gap:8px}
.presets button{font:inherit;font-size:.8rem;color:var(--muted);background:transparent;border:1px solid var(--line-strong);border-radius:999px;padding:6px 12px;cursor:pointer}
.presets button:hover,.presets button[aria-pressed=true]{color:var(--fg);border-color:var(--accent);background:var(--accent-wash)}
.fine{font-size:.78rem;color:var(--dim)}
.sources{margin-top:28px;display:grid;gap:8px}
.sources ol{margin:0;padding-left:1.2em;color:var(--muted);font-size:.93rem;display:grid;gap:4px}

/* country debt */
.debt{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(28px,5vw,64px);align-items:center}
@media (max-width:900px){.debt{grid-template-columns:1fr}}
.ladder{display:grid;gap:10px}
.rung{display:grid;grid-template-columns:120px minmax(0,1fr) 70px;gap:12px;align-items:center;font-size:.85rem;color:var(--muted)}
.rung .bar{height:10px;border-radius:5px;background:var(--line);overflow:hidden}
.rung .bar i{display:block;height:100%;background:var(--accent);border-radius:5px;transform-origin:left;animation:fill 2.4s cubic-bezier(.2,.7,.2,1) both}
.rung .badge{font-family:var(--f-mono);font-size:.72rem;color:var(--accent);text-align:right}
@keyframes fill{from{transform:scaleX(.02)}to{transform:scaleX(1)}}
.ladder-cap{font-size:.78rem;color:var(--dim);margin-top:6px}

/* trust rules */
.rules{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.rule{background:var(--bg);padding:24px 22px;display:grid;gap:8px;align-content:start}
.rule code{font-family:var(--f-mono);font-size:.78rem;color:var(--accent)}
.rule h3{font-family:var(--f-body);font-weight:600;font-size:1.05rem}
.rule p{color:var(--muted);font-size:.93rem}
@media (max-width:900px){.rules{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.rules{grid-template-columns:1fr}}

/* permanence */
.layers{display:grid;gap:14px}
.layer{display:grid;grid-template-columns:200px minmax(0,1fr);gap:24px;padding:24px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.layer:first-child{border-color:var(--line-strong);background:linear-gradient(180deg,var(--accent-wash),var(--surface))}
.layer .tag{font-family:var(--f-mono);font-size:.75rem;color:var(--accent);text-transform:uppercase;letter-spacing:.1em}
.layer h3{font-size:1.6rem;margin-top:6px}
.layer p{color:var(--muted)}
.layer ul{margin:10px 0 0;padding-left:1.1em;color:var(--muted);display:grid;gap:4px;font-size:.95rem}
@media (max-width:720px){.layer{grid-template-columns:1fr;gap:10px}}
.biochar{margin-top:clamp(32px,5vw,48px);display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,32px)}
.bc{display:grid;gap:6px;border-top:1px solid var(--line-strong);padding-top:14px}
.bc .k{font-family:var(--f-mono);font-size:.75rem;color:var(--accent)}
.bc p{color:var(--muted);font-size:.95rem}
@media (max-width:820px){.biochar{grid-template-columns:1fr}}

/* on-chain */
.chain{display:grid;gap:12px}
.addr{display:grid;grid-template-columns:220px minmax(0,1fr) auto;gap:16px;align-items:center;padding:16px 18px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.addr .what{font-size:.9rem}
.addr .what small{display:block;color:var(--muted);font-size:.8rem}
.addr .hash{font-family:var(--f-mono);font-size:.82rem;color:var(--fg);overflow-wrap:anywhere;min-width:0}
.addr .acts{display:flex;gap:8px}
.mini{font:inherit;font-size:.78rem;padding:6px 10px;border-radius:6px;border:1px solid var(--line-strong);color:var(--muted);background:transparent;cursor:pointer;text-decoration:none;white-space:nowrap}
.mini:hover{color:var(--fg);border-color:var(--accent)}
@media (max-width:820px){.addr{grid-template-columns:1fr;gap:8px}}
.status{margin-top:22px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.status div{padding:18px;border-radius:10px;border:1px solid var(--line)}
.status .now{border-color:var(--line-strong)}
.status h3{font-family:var(--f-body);font-size:1rem;font-weight:600;margin-bottom:6px}
.status p{color:var(--muted);font-size:.92rem}
@media (max-width:720px){.status{grid-template-columns:1fr}}

/* roadmap */
.road{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(14px,2vw,24px);position:relative}
.road::before{content:"";position:absolute;left:0;right:0;top:9px;height:1px;background:var(--line-strong)}
.stage{position:relative;padding-top:34px;display:grid;gap:6px;align-content:start}
.stage::before{content:"";position:absolute;top:2px;left:0;width:15px;height:15px;border-radius:50%;background:var(--bg);border:2px solid var(--accent)}
.stage.done::before{background:var(--accent)}
.stage .k{font-family:var(--f-mono);font-size:.75rem;color:var(--accent)}
.stage h3{font-family:var(--f-body);font-size:1.05rem;font-weight:600}
.stage p{color:var(--muted);font-size:.92rem}
@media (max-width:820px){.road{grid-template-columns:1fr}.road::before{left:7px;right:auto;top:0;bottom:0;width:1px;height:auto}.stage{padding-top:0;padding-left:32px}.stage::before{top:4px}}

/* faq */
.faq{display:grid;gap:0;border-top:1px solid var(--line);max-width:860px}
details{border-bottom:1px solid var(--line);padding:18px 0}
summary{cursor:pointer;font-size:1.1rem;list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-family:var(--f-mono);color:var(--accent)}
details[open] summary::after{content:"−"}
details p{color:var(--muted);margin-top:10px}

/* closing */
.closing{text-align:left}
.closing h2{font-size:clamp(2.4rem,6vw,4.8rem);max-width:16ch}
footer{padding-block:40px;color:var(--dim);font-size:.82rem}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px}

@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}html{scroll-behavior:auto}}
/* X (social) links: an icon in the nav, a button by the closing call to action, a handle in the footer */
.nav-actions{display:flex;align-items:center;gap:10px}
.social{display:inline-grid;place-items:center;width:44px;height:44px;border-radius:999px;border:1px solid var(--line-strong);color:var(--fg);transition:border-color .2s,color .2s}
.social:hover{border-color:var(--accent);color:var(--accent)}
.x-logo{width:16px;height:16px;fill:currentColor;flex:none}
.btn .x-logo{margin-right:2px}
.social-link{display:inline-flex;align-items:center;gap:8px;color:var(--muted);text-decoration:none}
.social-link:hover{color:var(--accent)}
.nav-actions .btn{white-space:nowrap}
@media (max-width:380px){.nav-actions .btn{padding-inline:14px}.social{width:40px;height:40px}}