:root{--ink:#123d58;--muted:#42647a;--blue:#087bab;--deep:#005c88;--cyan:#04bdd4;--line:#d3e8f0;--ice:#eff9fd;--white:#fff;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--white);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:2rem}body{margin:0}a{color:inherit;text-underline-offset:.25em}button,select,textarea{font:inherit}button,a,select,summary{touch-action:manipulation}a:focus-visible,button:focus-visible,select:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid var(--deep);outline-offset:5px}img{display:block;max-width:100%;height:auto}button,.button{cursor:pointer}.wrap{width:min(1160px,calc(100% - 3rem));margin:auto}.skip{position:absolute;top:-6rem;left:1rem;z-index:10;background:white;padding:1rem}.skip:focus{top:1rem}.header{display:flex;align-items:center;justify-content:space-between;gap:2rem;padding:1.4rem 0;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;font-weight:800;font-size:1.2rem;letter-spacing:-.04em}.brand img{width:42px;height:42px;border-radius:8px}nav{display:flex;gap:1.5rem;align-items:center;flex-wrap:wrap;font-size:.9rem}nav a{text-decoration:none;padding:.5rem 0}nav a:hover{text-decoration:underline}.hero{padding:5rem 0 3rem;display:grid;grid-template-columns:1fr 1.18fr;gap:2.5rem;align-items:center}.eyebrow{font-size:.75rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--deep);margin:0 0 1.5rem}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(3.1rem,5.5vw,5.1rem);line-height:1.02;letter-spacing:-.065em;margin-bottom:1.5rem}h1 span{color:var(--blue)}h2{font-size:clamp(2rem,3.2vw,3.2rem);line-height:1.1;letter-spacing:-.05em;margin-bottom:1.5rem}h3{font-size:1.25rem;letter-spacing:-.025em}p{font-size:1.08rem;line-height:1.7;color:var(--muted)}.lead{font-size:1.18rem;max-width:35rem}.actions{display:flex;flex-wrap:wrap;align-items:center;gap:1.25rem;margin:2rem 0 1rem}.button{display:inline-flex;min-height:48px;align-items:center;justify-content:center;text-decoration:none;padding:.9rem 1.3rem;border:1px solid var(--deep);border-radius:6px;background:var(--deep);color:white;font-weight:700;line-height:1.3}.button:hover{background:#064d70}.secondary{background:transparent;color:var(--deep)}.secondary:hover{background:var(--ice)}.small,small,figcaption{font-size:.8rem;line-height:1.6;color:var(--muted)}figure{margin:0}.hero-art{background:var(--ice);border:1px solid var(--line);border-radius:4px;overflow:hidden}.hero-art img{width:100%}.hero-art figcaption{padding:.8rem 1rem;background:white}.facts{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:1.5rem 0 0}.facts div{padding:1.75rem 2rem;border-right:1px solid var(--line)}.facts div:first-child{padding-left:0}.facts div:last-child{border:0}.facts strong{display:block;margin-bottom:.5rem}.facts p{font-size:.95rem;margin:0}.section{padding:5rem 0}.section-heading{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:start;margin-bottom:2rem}.section-heading p{margin:0}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem}.step{border-top:2px solid var(--line);padding-top:1.5rem}.num{color:var(--blue);font-size:.8rem;letter-spacing:.1em;margin-bottom:1rem;display:block;font-weight:800}.step p{font-size:1rem;margin:0}.demo-section{background:var(--ice);border-block:1px solid var(--line)}.demo{display:grid;grid-template-columns:1fr 1fr;gap:5rem;align-items:center}.equations{font-size:2rem;font-weight:700;display:grid;gap:1rem;margin-bottom:2rem}.equation{display:flex;align-items:center;gap:1rem}.shape{display:inline-block;width:36px;height:36px;flex-shrink:0;background:var(--blue)}.circle{border-radius:50%;background:var(--cyan)}.triangle{clip-path:polygon(50% 0,100% 100%,0 100%);background:#1486d2}.answers{display:flex;gap:1rem;flex-wrap:wrap}.answers label{font-size:.85rem;font-weight:700;display:grid;gap:.5rem}.answers select{min-width:85px;min-height:48px;border:1px solid #719aad;border-radius:4px;padding:.5rem;background:white;color:var(--ink)}.result{min-height:3rem;margin:1rem 0 0;font-weight:700;color:var(--deep)}.gallery{display:grid;grid-template-columns:1fr 1fr;gap:2rem}.gallery figure{padding:2rem;background:var(--ice);border:1px solid var(--line)}.phone{background:#20272b;border-radius:24px;padding:8px;border:2px solid #8095a0;box-shadow:0 15px 22px #123d5815;overflow:hidden}.phone img{border-radius:15px;width:100%}.gallery figcaption{margin-top:1.5rem}.gallery figcaption strong{display:block;font-size:1.2rem;color:var(--ink);margin-bottom:.5rem}.gallery .night{background:#e0eef5}.gallery-note{margin:1rem 0 0}.donate{background:#07577e;color:white;border-radius:6px;padding:3rem;display:grid;grid-template-columns:1.1fr 1fr;gap:3rem}.donate p,.donate .eyebrow,.donate .small{color:#d6eef9}.donate .button{color:var(--ink);background:white;border-color:white}.donate a:focus-visible,.donate button:focus-visible,.donate summary:focus-visible,.donate textarea:focus-visible{outline-color:#72e2ed}.donate .button:hover{background:#d6eef9}.wallet{background:#fff;color:var(--ink);padding:1.5rem;border-radius:4px}.wallet .small{color:var(--muted)}.wallet img{width:190px;margin:0 auto 1.25rem}.wallet label{font-size:.8rem;font-weight:700;display:block;margin:1rem 0 .5rem}.wallet textarea{width:100%;height:6rem;resize:vertical;padding:.75rem;border:1px solid #719aad;font-size:.72rem;line-height:1.5;overflow-wrap:anywhere}.wallet button{background:var(--deep);color:white;border:0;border-radius:4px;min-height:44px;padding:.7rem 1rem;margin-top:.75rem}.wallet .result{font-size:.8rem;min-height:1.2rem;margin:.6rem 0 0}.faq{max-width:850px;margin:auto}.faq details{border-bottom:1px solid var(--line);padding:1.25rem 0}.faq summary{cursor:pointer;font-size:1.1rem;font-weight:700;line-height:1.5}.faq details p{margin:1rem 0 0;font-size:1rem}.closing{text-align:center;background:var(--ice);padding:4rem 1.5rem}.closing p{max-width:35rem;margin-inline:auto}.closing .actions{justify-content:center}.footer{display:flex;align-items:start;justify-content:space-between;gap:2rem;padding:2rem 0}.footer p{font-size:.8rem;margin:0}.footer nav{font-size:.8rem;gap:1.25rem}button:disabled{cursor:default}details .wallet{margin-top:1.25rem}.donate summary{cursor:pointer;padding:1rem 0;font-weight:700}.donate h2{font-size:2.6rem}
@media(max-width:900px){.header{align-items:start}.hero{gap:1.5rem;padding-top:3rem;grid-template-columns:1fr 1fr}h1{font-size:3.3rem}.demo{gap:2rem}.section-heading{gap:2rem}.gallery figure{padding:1rem}.donate{padding:2rem;gap:2rem}.donate h2{font-size:2.2rem}}
@media(max-width:680px){.wrap{width:calc(100% - 2rem)}.header{display:block;padding:1rem 0}.header nav{margin-top:1rem;gap:.5rem 1rem}.hero{grid-template-columns:1fr;padding:2.5rem 0 1.5rem;gap:2rem}h1{font-size:clamp(3rem,12vw,4.2rem)}.eyebrow{margin-bottom:1rem}.hero-art{margin-inline:0}.facts{grid-template-columns:1fr}.facts div,.facts div:first-child{padding:1.2rem 0;border-right:0;border-bottom:1px solid var(--line)}.section{padding:3rem 0}.section-heading,.demo,.donate{grid-template-columns:1fr;gap:1.5rem}.steps,.gallery{grid-template-columns:1fr;gap:1.5rem}.step{padding-top:1rem}.donate{padding:1.5rem}.donate h2{font-size:2.1rem}.footer{flex-direction:column}.equations{font-size:1.7rem}.shape{width:30px;height:30px}.equation{gap:.75rem}.phone{border-radius:19px;padding:5px}.phone img{border-radius:11px}.actions{gap:1rem}.closing{padding:3rem 1rem}}
.tutorial-section{background:#f8fcfe;border-top:1px solid var(--line)}.tutorial-layout{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}.lesson-board{padding:2rem;background:white;border:1px solid var(--line);border-radius:6px}.lesson-equation{display:grid;grid-template-columns:repeat(5,1fr);align-items:center;text-align:center;gap:.5rem;padding:1rem;margin-bottom:.75rem;border:2px solid transparent;border-radius:4px;font-size:2rem;transition:background .35s,border-color .35s,opacity .35s}.lesson-equation.active{border-color:var(--blue);background:#e7f8fe}.lesson-equation.dimmed{background:#fbfdfe}.lesson-equation.solved{border-color:#147292;background:#eafaff}.token{display:grid;place-items:center;min-height:44px;font-weight:800;color:var(--deep)}.token.reveal{animation:reveal .45s ease both}.lesson-board .small{margin:1.5rem 0 0}.lesson-progress{display:flex;gap:.75rem;margin-bottom:1.75rem}.lesson-progress button{width:44px;height:44px;border:1px solid #719aad;background:white;border-radius:50%;color:var(--deep);font-weight:700}.lesson-progress button[aria-current]{background:var(--deep);color:white;border-color:var(--deep)}.lesson-text h3{font-size:1.7rem}.lesson-text .eyebrow{margin-bottom:.75rem}.deduction{padding:1rem;border-left:3px solid var(--cyan);background:#eaf7fc;color:var(--ink);font-weight:700;min-height:4rem}.lesson-text button:disabled{opacity:.4}.lesson-text #lesson-comment{min-height:250px}@keyframes reveal{from{transform:translateY(-8px) scale(.85);opacity:.2}to{transform:translateY(0) scale(1);opacity:1}}@media(max-width:680px){.tutorial-layout{grid-template-columns:1fr;gap:2rem}.lesson-board{padding:1rem}.lesson-equation{font-size:1.6rem;padding:.8rem .5rem}.lesson-text #lesson-comment{min-height:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.token.reveal{animation:none}.lesson-equation{transition:none}}


/* Frame only the game area: the source capture includes 48px at the top
   and 96px at the right reserved for Android system bars. No game UI is clipped. */
.phone-screen{position:relative;aspect-ratio:1184/672;overflow:hidden;border-radius:15px;background:#000}
.phone .phone-screen img{position:absolute;left:0;top:0;width:108.108108108%;max-width:none;height:auto;border-radius:0;transform:translateY(-6.666666667%)}
.video-section{background:#eaf7fc;border-block:1px solid var(--line)}
.video-layout{display:grid;grid-template-columns:1.1fr 1fr;align-items:center;gap:3rem}
.video-card{display:flex;flex-direction:column;align-items:flex-start;gap:1rem;background:var(--deep);color:white;padding:2.5rem;border-radius:6px;text-decoration:none;transition:background .2s}
.video-card:hover{background:#084669}.video-card strong{font-size:1.5rem;line-height:1.25}.video-card>span{line-height:1.5}.video-card .play-symbol{display:grid;place-items:center;width:64px;height:64px;border:1px solid #b4ecff;border-radius:50%;font-size:1.5rem}.video-link{text-decoration:underline;text-underline-offset:.3em}.video-card:focus-visible{outline-offset:6px}
@media(max-width:680px){.phone-screen{border-radius:11px}.video-layout{grid-template-columns:1fr;gap:1.5rem}.video-card{padding:1.5rem}}
@media(prefers-reduced-motion:reduce){.video-card{transition:none}}

/* CryptoCalc flat geometric visual refresh, 9 October 2026. */
:root{--ink:#163d50;--muted:#42616f;--blue:#087fcb;--deep:#00658a;--cyan:#09bfd0;--line:#d2e5ea;--ice:#eef7f8;--white:#f8fafb}
.header{gap:1rem;padding:1rem 0;min-height:76px}.header nav{gap:1.6rem}.header .brand img{border-radius:0}.app-nav a[aria-current="page"]{color:var(--deep);font-weight:800;border-bottom:3px solid var(--cyan)}
.page-nav{display:flex;gap:1.75rem;padding:1rem 0;font-size:.85rem;border-bottom:1px solid var(--line)}
.hero{padding:3rem 0 2.5rem;grid-template-columns:1fr 1.15fr;gap:2.75rem}.hero h1{font-size:clamp(3.1rem,5vw,4.8rem)}.hero-art{border:0;background:transparent;overflow:visible;border-radius:0}.hero-art svg{display:block;width:100%;height:auto}.hero-art figcaption{text-align:center;background:transparent;padding:.5rem;font-size:.75rem}.lead{font-size:1.1rem;max-width:31rem}.button{border-radius:4px;transition:transform .18s,background .18s}.button:active{transform:translateY(2px)}
.facts{background:#fff;border:0;gap:2rem;padding:2rem 0;margin:0}.facts div,.facts div:first-child{padding:0 1rem;border:0}.facts strong{font-size:1.05rem}.facts p{font-size:.95rem}.fact-art{width:64px;height:64px;display:block;margin-bottom:1rem}
.section-heading{display:block;max-width:760px}.section-heading h2{margin-bottom:1.25rem}.section-heading p{max-width:64ch}.steps{gap:2rem}.step{border-top:0;padding-top:1rem}.step .num{font-size:1.1rem;color:var(--deep)}.step h3{font-size:1.2rem}
.video-section,.tutorial-section,.demo-section{background:var(--ice)}.video-card{background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:4px;position:relative;overflow:hidden}.video-card:hover{background:#e4f2f5}.video-card .play-symbol{border-radius:0;background:#087fcb;color:#fff;border:0;clip-path:polygon(0 0,100% 50%,0 100%);font-size:0}.video-card strong,.video-card>span{position:relative;z-index:1}.video-card:after{content:"";position:absolute;right:-45px;bottom:-70px;width:210px;height:210px;border:42px solid #09bfd0;border-radius:50%;opacity:.18}
.lesson-board{border-radius:4px;box-shadow:none}.deduction{background:#e3f2f4}.gallery figure,.gallery .night{background:#eef4f6;border:0;border-radius:4px}.phone{box-shadow:none;border-radius:12px;border:2px solid #42616f;padding:6px;background:#fff}.phone img,.phone-screen{border-radius:6px}.donate{background:#edf6f7;color:var(--ink);border-radius:4px;border:1px solid var(--line)}.donate p,.donate .eyebrow,.donate .small{color:var(--muted)}.donate .button{background:var(--deep);color:#fff;border-color:var(--deep)}.donate .button:hover{background:#064d70}.wallet{border:1px solid var(--line)}.donate a:focus-visible,.donate button:focus-visible,.donate summary:focus-visible,.donate textarea:focus-visible{outline-color:var(--deep)}
.closing{position:relative;overflow:hidden;background:#e9f5f7}.closing>*{position:relative;z-index:1}.closing-art{display:block;width:min(210px,50%);height:auto;margin:0 auto 2rem}.footer{border-top:1px solid var(--line)}
@media(min-width:1000px){.header nav{flex-wrap:nowrap}}
@media(max-width:900px){.hero{grid-template-columns:1fr 1fr;gap:1.5rem}.header nav{gap:1rem}.hero h1{font-size:3.4rem}}
@media(max-width:680px){.header{display:flex;flex-wrap:wrap;align-items:center;padding:1rem 0}.header .brand{font-size:1.1rem}.header nav{margin-top:0;gap:.8rem;font-size:.82rem;width:100%;justify-content:space-between}.page-nav{gap:1rem;font-size:.8rem;justify-content:space-between;flex-wrap:wrap}.hero{grid-template-columns:1fr;padding:2rem 0;gap:1rem}.hero h1{font-size:clamp(3rem,12vw,4.2rem)}.hero-art{width:100%;max-width:580px;margin:auto}.facts{grid-template-columns:1fr;padding:1.5rem;gap:1.5rem}.facts div,.facts div:first-child{padding:0;border:0}.fact-art{width:48px;height:48px;float:left;margin:0 1rem .5rem 0}.facts p{margin-left:64px}.donate{padding:1.5rem}.phone{border-radius:10px}.phone-screen{border-radius:5px}}
@media(prefers-reduced-motion:reduce){.button{transition:none}}