/* Lacquer white, ghost glass and one Bitcoin orange. One sculptural object (the glass coin), everything else quiet. */
:root{
  --lacquer:#fbfbfd; --surface:#ffffff; --ink:#000000; --muted:#5b5e68; --line:#e3e4ea;
  --chrome:#c9ccd3; --btc:#f7931a; --btc-ink:#000000;
  --glass:rgba(255,255,255,.55); --glass-line:rgba(255,255,255,.9);
  --display:"Unbounded",system-ui,sans-serif; --body:"Instrument Sans",system-ui,sans-serif;
  --r-pill:999px; --r-big:40px; --r-mid:24px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --lacquer:#000000; --surface:#0d0e12; --ink:#f4f5f8; --muted:#a3a7b3; --line:#23252c;
  --chrome:#3a3d45; --glass:rgba(30,32,40,.55); --glass-line:rgba(255,255,255,.14); color-scheme:dark}}
:root[data-theme="dark"]{--lacquer:#000000; --surface:#0d0e12; --ink:#f4f5f8; --muted:#a3a7b3; --line:#23252c;
  --chrome:#3a3d45; --glass:rgba(30,32,40,.55); --glass-line:rgba(255,255,255,.14); color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--lacquer);color:var(--ink);font:17px/1.6 var(--body)}
img{max-width:100%}
a{color:inherit}
:focus-visible{outline:3px solid var(--btc);outline-offset:3px;border-radius:6px}
.wrap{max-width:1140px;margin:0 auto;padding-inline:max(16px,env(safe-area-inset-left,0px))}
h1,h2,h3{font-family:var(--display);font-weight:600;line-height:1.05;margin:0;text-wrap:balance;letter-spacing:-.01em}
h1{font-size:clamp(2.3rem,6vw,4.6rem);font-weight:700;letter-spacing:-.03em}
h2{font-size:clamp(1.6rem,3.4vw,2.5rem)}
h3{font-size:1.15rem}
p{margin:0 0 1em}

/* header: a floating pill */
.top{position:sticky;top:12px;z-index:10;padding-top:12px}
.top .bar{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--glass);backdrop-filter:blur(18px) saturate(1.4);-webkit-backdrop-filter:blur(18px) saturate(1.4);border:1px solid var(--glass-line);border-radius:var(--r-pill);padding:8px 8px 8px 20px;box-shadow:0 10px 30px -18px rgba(0,0,0,.35)}
.logo{font:700 1rem var(--display);text-decoration:none;display:flex;align-items:center;gap:10px;white-space:nowrap}
.logo i{font-style:normal;display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--btc);color:#000;font-size:.95rem}
.logo span{font-weight:400}
nav{display:flex;gap:4px;flex-wrap:wrap}
nav a{text-decoration:none;font-size:.92rem;padding:8px 14px;border-radius:var(--r-pill);color:var(--muted)}
nav a:hover,nav a[aria-current]{background:var(--ink);color:var(--lacquer)}
@media (max-width:720px){.top .bar{flex-direction:column;border-radius:var(--r-mid);padding:12px}nav{justify-content:center}}

/* buttons: fat pills */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--ink);color:var(--lacquer);font:600 1rem var(--body);text-decoration:none;padding:14px 24px;border-radius:var(--r-pill);border:0;cursor:pointer}
.btn.btc{background:var(--btc);color:#000}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn:hover{transform:translateY(-1px)}
.ctas{display:flex;gap:12px;flex-wrap:wrap}

/* hero with the glass coin */
.hero{position:relative;padding-block:64px 72px;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.hero .lede{font-size:1.2rem;color:var(--muted);max-width:30em;margin:22px 0 30px}
.stage{position:relative;min-height:560px;display:grid;place-items:end}
.coin{position:absolute;top:0;left:0;width:min(400px,80%);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle at 30% 22%,rgba(255,255,255,.85),rgba(255,255,255,0) 26%),
    conic-gradient(from 210deg,#ffd49a,#f7931a,#ffb347,#fff1dc,#f7931a,#c96a00,#ffd49a);
  box-shadow:inset -30px -40px 80px rgba(120,50,0,.45),inset 20px 20px 60px rgba(255,255,255,.6),0 60px 90px -40px rgba(247,147,26,.7);
  animation:spin 18s linear infinite}
.coin::after{content:"₿";position:absolute;inset:0;display:grid;place-items:center;font:700 min(260px,48vw)/1 var(--display);color:rgba(255,255,255,.55);text-shadow:0 2px 0 rgba(160,70,0,.35)}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.coin{animation:none}}
.glasscalc{position:relative;width:min(360px,100%);margin-top:230px;margin-left:auto}
@media (max-width:900px){.hero .wrap{grid-template-columns:1fr}.stage{min-height:0;place-items:center}.coin{left:50%;margin-left:min(-150px,-35vw);width:min(300px,70vw)}.glasscalc{margin:190px auto 0}}

/* ghost panels (calculators) */
.ghostp{background:var(--glass);backdrop-filter:blur(22px) saturate(1.5);-webkit-backdrop-filter:blur(22px) saturate(1.5);border:1px solid var(--glass-line);border-radius:var(--r-big);padding:28px;box-shadow:0 30px 60px -30px rgba(0,0,0,.35)}
.solid{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-big);padding:28px}
.f{display:block;margin-bottom:16px}
.f span{display:block;font-size:.88rem;color:var(--muted);margin-bottom:6px}
.f input,.f select{width:100%;font:600 1.2rem var(--display);color:var(--ink);background:var(--surface);border:1.5px solid var(--line);border-radius:var(--r-pill);padding:12px 20px;-webkit-appearance:none;appearance:none}
.f input:focus,.f select:focus{border-color:var(--btc);outline:0}
.res{display:grid;gap:10px;border-top:1.5px solid var(--line);padding-top:16px;margin-top:4px}
.res div{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.res dt,.res span{color:var(--muted);font-size:.94rem}
.res b{font:600 1.15rem var(--display);font-variant-numeric:tabular-nums;text-align:right}
.res .big b{font-size:1.6rem}
.res .pos{color:#0f8a4f}.res .neg{color:#d23b3b}
.fine{font-size:.82rem;color:var(--muted);margin:14px 0 0}

section.blk{padding-block:72px}
.head{max-width:640px;margin-bottom:32px}
.head p{color:var(--muted);margin-top:12px}

/* tools: three sculpted tiles with different radii */
.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.tile{position:relative;text-decoration:none;background:var(--surface);border:1px solid var(--line);padding:30px;min-height:240px;display:flex;flex-direction:column;gap:10px;overflow:hidden}
.tile:nth-child(1){border-radius:120px 24px 24px 24px}
.tile:nth-child(2){border-radius:24px}
.tile:nth-child(3){border-radius:24px 24px 120px 24px}
.tile p{color:var(--muted);margin:0}
.tile .go{margin-top:auto;font-weight:600}
.tile:hover{border-color:var(--btc)}
.tile .n{font:700 3.2rem/1 var(--display);color:var(--btc)}
@media (max-width:900px){.tiles{grid-template-columns:1fr}.tile{min-height:0}.tile:nth-child(n){border-radius:28px}}

/* comparison */
.tbl{overflow-x:auto;border-radius:var(--r-mid);border:1px solid var(--line);background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:720px}
th,td{text-align:left;padding:18px 20px;border-bottom:1px solid var(--line);vertical-align:top;font-size:.96rem}
thead th{font-weight:600;color:var(--muted);font-size:.86rem}
tbody tr:last-child td{border-bottom:0}
.nm{font:600 1.05rem var(--display)}
.tg{display:inline-block;font-size:.78rem;padding:3px 10px;border-radius:var(--r-pill);background:var(--lacquer);border:1px solid var(--line);margin-top:6px}
td .btn{padding:10px 16px;font-size:.9rem;white-space:nowrap}

/* steps (real sequence) */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{counter-increment:s;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-mid);padding:24px}
.steps li::before{content:counter(s);display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--ink);color:var(--lacquer);font:700 1rem var(--display);margin-bottom:14px}
.steps p{color:var(--muted);margin:8px 0 0;font-size:.95rem}
@media (max-width:900px){.steps{grid-template-columns:1fr 1fr}}@media (max-width:520px){.steps{grid-template-columns:1fr}}

/* guides list */
.guides{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.guides a{display:flex;justify-content:space-between;align-items:center;gap:16px;text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-pill);padding:18px 26px;font-weight:600}
.guides a:hover{background:var(--ink);color:var(--lacquer)}
.guides small{font-weight:400;color:var(--muted)}
.guides a:hover small{color:var(--chrome)}
@media (max-width:720px){.guides{grid-template-columns:1fr}.guides a{border-radius:var(--r-mid)}}

.faq{display:grid;gap:10px;max-width:800px}
details{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-mid);padding:18px 24px}
summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font:600 1.2rem var(--display);color:var(--btc)}
details[open] summary::after{content:"−"}
details p{margin:12px 0 0;color:var(--muted)}

/* inner pages */
.ph{padding-block:56px 24px}
.ph .lede{font-size:1.15rem;color:var(--muted);max-width:36em;margin-top:18px}
.crumb{font-size:.9rem;color:var(--muted);margin-bottom:18px}.crumb a{color:var(--muted)}
.tool{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start;padding-bottom:40px}
@media (max-width:900px){.tool{grid-template-columns:1fr}}
.cmp{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:900px){.cmp{grid-template-columns:1fr}}
.prose{padding-bottom:40px}.prose>*{max-width:720px}
.prose h2{font-size:1.6rem;margin:40px 0 12px}
.prose h3{margin:26px 0 8px}
.prose ul,.prose ol{padding-left:22px}.prose li{margin-bottom:6px}
.note{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-mid);padding:18px 22px;margin:22px 0}
.note p:last-child{margin:0}
.prose table{min-width:0;margin:16px 0;border:1px solid var(--line);border-radius:var(--r-mid);overflow:hidden;background:var(--surface)}
.upd{font-size:.88rem;color:var(--muted)}

.risk{border-top:1px solid var(--line);padding-block:28px;font-size:.88rem;color:var(--muted)}
.risk strong{color:var(--ink)}
footer{padding-block:28px 40px;font-size:.9rem;color:var(--muted)}
footer .wrap{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
footer nav a{padding:0;margin-right:16px}footer nav a:hover{background:none;color:var(--ink)}