:root{--bg: #0a0e17;--bg-elev: #111726;--bg-elev-2: #18203250;--border: #233047;--border-soft: #1b2536;--text: #e6edf6;--text-dim: #9aa9bf;--text-faint: #5e6e88;--cyan: #2dd4bf;--cyan-glow: #2dd4bf66;--violet: #8b7cf6;--violet-glow: #8b7cf666;--magenta: #e879c9;--amber: #f0b449;--green: #4ade80;--red: #f87171;--mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, monospace;--sans: "Inter", system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;--radius: 14px;--maxw: 920px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:radial-gradient(1200px 600px at 80% -10%,#1b2440 0%,transparent 60%),radial-gradient(900px 500px at 0% 10%,#161a36 0%,transparent 55%),var(--bg);color:var(--text);font-family:var(--sans);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--cyan)}.app{max-width:var(--maxw);margin:0 auto;padding:0 20px 120px}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:14px 20px;margin:0 -20px 8px;background:#0a0e17cc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border-soft)}.topbar .brand{display:flex;align-items:baseline;gap:10px}.topbar .brand h1{font-size:1.05rem;margin:0;letter-spacing:.02em}.topbar .brand .key{font-size:1.2rem}.lang-btn{font-family:var(--mono);font-size:.8rem;color:var(--text);background:var(--bg-elev);border:1px solid var(--border);border-radius:999px;padding:6px 14px;cursor:pointer;transition:border-color .15s,color .15s}.lang-btn:hover{border-color:var(--cyan);color:var(--cyan)}.hero{padding:48px 0 28px}.hero h2{font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.15;margin:0 0 6px;background:linear-gradient(100deg,var(--cyan),var(--violet) 60%,var(--magenta));-webkit-background-clip:text;background-clip:text;color:transparent}.hero .sub{color:var(--text-dim);font-size:1rem;margin:0 0 22px}.hero .intro{font-size:1.05rem;color:var(--text);max-width:720px}.warning{display:flex;gap:10px;align-items:flex-start;margin:22px 0 0;padding:12px 16px;border:1px solid #4a3a12;background:#2a200a66;border-radius:var(--radius);color:#f5d99a;font-size:.88rem}.warning .icon{flex-shrink:0}.step{position:relative;margin:22px 0;padding:26px 26px 30px;background:linear-gradient(180deg,var(--bg-elev),#0d1320);border:1px solid var(--border-soft);border-radius:18px;scroll-margin-top:70px}.step:hover{border-color:var(--border)}.step-head{display:flex;align-items:center;gap:12px;margin-bottom:6px}.step-num{font-family:var(--mono);font-size:.78rem;color:var(--bg);background:linear-gradient(135deg,var(--cyan),var(--violet));width:30px;height:30px;border-radius:9px;display:grid;place-items:center;font-weight:700;flex-shrink:0}.step-head h3{margin:0;font-size:1.25rem}.tag{font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;color:var(--cyan);border:1px solid var(--cyan);border-radius:999px;padding:2px 9px;margin-left:auto}.step-desc{color:var(--text-dim);font-size:.95rem;margin:8px 0 20px;max-width:760px}.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.seg{display:inline-flex;background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:3px;gap:3px}.seg button{font-family:var(--sans);font-size:.82rem;color:var(--text-dim);background:transparent;border:0;border-radius:7px;padding:6px 14px;cursor:pointer;transition:background .15s,color .15s}.seg button.active{background:var(--bg-elev);color:var(--text);box-shadow:0 0 0 1px var(--border)}.btn{font-family:var(--sans);font-size:.85rem;font-weight:600;color:var(--bg);background:linear-gradient(135deg,var(--cyan),var(--violet));border:0;border-radius:10px;padding:9px 18px;cursor:pointer;transition:filter .15s,transform 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.label{font-size:.72rem;color:var(--text-faint);text-transform:uppercase;letter-spacing:.05em}.copy-btn{font-family:var(--mono);font-size:.68rem;color:var(--text-dim);background:var(--bg-elev);border:1px solid var(--border);border-radius:6px;padding:3px 9px;cursor:pointer}.copy-btn:hover{color:var(--cyan);border-color:var(--cyan)}.hl-left{color:var(--cyan)}.hl-right{color:var(--violet)}input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:4px;border-radius:4px;background:var(--border);outline:none}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:linear-gradient(135deg,var(--cyan),var(--violet));cursor:pointer;box-shadow:0 0 0 4px var(--cyan-glow)}input[type=range]::-moz-range-thumb{width:18px;height:18px;border:0;border-radius:50%;background:var(--violet);cursor:pointer}.meter{height:8px;border-radius:999px;background:var(--bg);border:1px solid var(--border-soft);overflow:hidden}.meter>span{display:block;height:100%;background:linear-gradient(90deg,var(--cyan),var(--magenta));transition:width .3s ease}.words{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px}.word{display:flex;align-items:baseline;gap:8px;background:var(--bg);border:1px solid var(--border-soft);border-radius:9px;padding:8px 10px}.word .n{font-family:var(--mono);font-size:.7rem;color:var(--text-faint);min-width:16px}.word .w{font-family:var(--mono);font-size:.9rem;color:var(--text)}.word.checksum{border-color:var(--amber)}.word-btn{font-family:inherit;cursor:pointer;text-align:left;transition:border-color .15s,background .15s}.word-btn:hover{border-color:var(--cyan)}.word-btn.tampered{border-color:var(--red);background:#2a1414;animation:valueFlash .5s ease-out}.word-btn.tampered .w{color:var(--red)}.checksum-badge{display:flex;align-items:center;gap:10px;margin-top:14px;padding:9px 14px;border-radius:10px;font-size:.85rem;border:1px solid var(--border)}.checksum-badge.ok{color:var(--green);border-color:#2f6b5a;background:#10271f}.checksum-badge.bad{color:var(--red);border-color:#6b2f2f;background:#271010}.bit-legend{display:flex;gap:18px;font-size:.76rem;color:var(--text-dim);margin-bottom:8px}.bit-legend .swatch{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:5px;vertical-align:-1px}.swatch.entropy{background:var(--text-dim)}.swatch.checksum{background:var(--amber)}.bit-groups{display:flex;flex-wrap:wrap;gap:6px;font-family:var(--mono);font-size:.72rem}.bit-group{padding:3px 7px;border-radius:6px;background:var(--bg);border:1px solid var(--border-soft);letter-spacing:1px}.bit-group .ebit{color:var(--text-dim)}.bit-group .cbit{color:var(--amber);font-weight:700}.label-line{font-size:.82rem;color:var(--text-dim);margin:14px 0 8px}.muted{color:var(--text-faint);font-size:.8rem}.site-footer{display:flex;align-items:center;gap:18px;margin-top:40px;padding:24px 26px;background:linear-gradient(180deg,var(--bg-elev),#0d1320);border:1px solid var(--border-soft);border-radius:18px}.footer-avatar{width:72px;height:72px;border-radius:50%;border:2px solid var(--cyan);box-shadow:0 0 0 4px var(--cyan-glow);flex-shrink:0}.footer-name{font-size:1.1rem;font-weight:700;margin-bottom:2px}.footer-roles{font-size:.84rem;color:var(--text-dim);line-height:1.5}.footer-links{display:flex;flex-wrap:wrap;gap:16px;margin-top:10px}.footer-links a{font-size:.85rem;color:var(--text);text-decoration:none;border:1px solid var(--border);border-radius:999px;padding:5px 14px;transition:border-color .15s,color .15s}.footer-links a:hover{border-color:var(--cyan);color:var(--cyan)}@media(max-width:560px){.site-footer{flex-direction:column;text-align:center}.footer-links{justify-content:center}}.step-nav{position:fixed;right:max(16px,calc((100vw - var(--maxw)) / 2 - 44px));top:50%;transform:translateY(-50%);display:flex;flex-direction:column;gap:12px;z-index:15}.step-nav-dot{width:26px;height:26px;border-radius:50%;border:1px solid var(--border);background:var(--bg-elev);display:grid;place-items:center;text-decoration:none;transition:all .2s}.step-nav-num{font-family:var(--mono);font-size:.68rem;color:var(--text-faint)}.step-nav-dot:hover{border-color:var(--cyan)}.step-nav-dot.active{border-color:var(--cyan);background:linear-gradient(135deg,var(--cyan),var(--violet));box-shadow:0 0 0 4px var(--cyan-glow)}.step-nav-dot.active .step-nav-num{color:var(--bg);font-weight:700}@media(max-width:1180px){.step-nav{display:none}}.glossary{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:18px 0 0}.glossary-label{font-size:.78rem;color:var(--text-faint)}.term{position:relative;font-size:.78rem;font-family:var(--mono);color:var(--cyan);border:1px solid var(--border);border-bottom-style:dotted;border-radius:999px;padding:3px 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fadeUp{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.fade-up{animation:fadeUp .35s ease-out}@keyframes popIn{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}.pop-in{animation:popIn .25s ease-out}@keyframes cascadeGlow{0%,to{box-shadow:0 0 0 0 transparent;border-color:var(--border-soft)}40%{box-shadow:0 0 0 1px var(--cyan),0 0 24px -4px var(--cyan-glow);border-color:var(--cyan)}}.step.cascade{animation:cascadeGlow .7s ease-out;animation-delay:var(--cascade-delay, 0ms)}@keyframes dotPulse{0%,to{background:var(--border);transform:scale(1)}50%{background:var(--cyan);transform:scale(1.5)}}.cascade-dots{display:inline-flex;flex-direction:column;gap:4px}.cascade-dots i{width:6px;height:6px;border-radius:50%;background:var(--border)}.cascade-dots.run i{animation:dotPulse .5s ease-out}.cascade-dots.run i:nth-child(1){animation-delay:0ms}.cascade-dots.run i:nth-child(2){animation-delay:90ms}.cascade-dots.run i:nth-child(3){animation-delay:.18s}.cascade-dots.run i:nth-child(4){animation-delay:.27s}.cascade-dots.run i:nth-child(5){animation-delay:.36s}.cascade-dots.run i:nth-child(6){animation-delay:.45s}@media(prefers-reduced-motion:reduce){.flash,.flow-line,.fade-up,.pop-in,.step.cascade,.cascade-dots.run i{animation:none}}.tree{margin:4px 0 8px;overflow-x:auto;padding:4px 2px 8px}.tnode-wrap{position:relative}.tchildren{margin-left:26px;padding-left:18px;border-left:1.5px solid var(--border)}.tnode{display:inline-flex;align-items:center;gap:10px;margin:4px 0;padding:7px 12px;font-family:var(--mono);font-size:.82rem;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:9px;cursor:pointer;position:relative;transition:border-color .15s,background .15s,box-shadow .15s}.tnode:hover:not(:disabled){border-color:var(--cyan)}.tnode.open{border-color:var(--cyan);box-shadow:0 0 0 1px var(--cyan-glow)}.tnode.root{background:linear-gradient(135deg,#14203a,#1a1530);border-color:var(--violet);font-weight:600}.tnode:disabled{cursor:default;opacity:.85}.tchildren>.tnode-wrap>.tnode:before{content:"";position:absolute;left:-18px;top:50%;width:16px;height:1.5px;background:var(--border)}.tnode-path{color:var(--cyan)}.tnode.root .tnode-path{color:var(--violet)}.tnode-fp{color:var(--text-faint);font-size:.74rem}.tnode-caret{color:var(--text-dim);font-size:.95rem;width:12px;text-align:center}.split-arrows{display:flex;justify-content:space-between;font-size:.78rem;margin:8px 4px 10px}.split-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.split-grid .hexbox:first-child{border-color:#2f6b5a}.split-grid .hexbox:last-child{border-color:#5a3f7a}@media(max-width:560px){.split-grid{grid-template-columns:1fr}.split-arrows{flex-direction:column;gap:2px}}.curve-badge{display:inline-flex;align-items:center;gap:8px;font-size:.76rem;font-family:var(--mono);padding:5px 12px;border-radius:999px;border:1px solid var(--border)}.curve-badge .curve-dot{width:8px;height:8px;border-radius:50%}.curve-badge.secp{color:var(--cyan);border-color:#1f5a52;background:#0e2420}.curve-badge.secp .curve-dot{background:var(--cyan)}.curve-badge.ed{color:var(--magenta);border-color:#5a2f54;background:#2a1226}.curve-badge.ed .curve-dot{background:var(--magenta)}.curve-caveat{margin-top:14px;padding:10px 13px;border-radius:10px;background:#2a1226;border:1px solid #5a2f54;color:#e7a9d8;font-size:.82rem;line-height:1.5}.compare{margin-top:22px;padding:18px;background:var(--bg-elev-2);border:1px solid var(--border-soft);border-radius:14px}.compare-title{font-weight:600;font-size:1rem;margin-bottom:2px}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:8px}.compare-card{padding:14px;border-radius:11px;background:var(--bg);border:1px solid var(--border)}.compare-card.normal{border-color:#2f6b5a}.compare-card.hard{border-color:#5a3f7a}.compare-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:8px;flex-wrap:wrap}.badge{font-size:.68rem;padding:2px 8px;border-radius:999px;white-space:nowrap}.badge.ok{color:var(--green);border:1px solid #2f6b5a;background:#10271f}.badge.warn{color:var(--violet);border:1px solid #5a3f7a;background:#1d152b}.mono{font-family:var(--mono)}.fp{font-size:.78rem;color:var(--text-dim);word-break:break-all}@media(max-width:560px){.compare-grid{grid-template-columns:1fr}}.summary-phrase{padding:14px 16px;border-radius:12px;background:linear-gradient(135deg,#14203a,#1a1530);border:1px solid var(--violet);margin-bottom:18px}.phrase-text{font-size:.9rem;line-height:1.8;color:var(--text);word-spacing:4px}.summary-rows{display:grid;gap:8px}.summary-row{display:flex;align-items:center;gap:12px;padding:10px 14px;background:var(--bg);border:1px solid var(--border-soft);border-radius:10px}.summary-row .sym{font-size:1.1rem;width:22px;text-align:center;color:var(--cyan)}.srow-main{display:flex;flex-direction:column;gap:1px;flex:1;min-width:0}.srow-coin{font-size:.88rem}.srow-path{font-size:.72rem;color:var(--text-faint)}.srow-addr{font-size:.8rem;color:var(--violet);white-space:nowrap}.closing{margin-top:22px;text-align:center;font-size:1.05rem;color:var(--text);background:linear-gradient(100deg,var(--cyan),var(--violet));-webkit-background-clip:text;background-clip:text;color:transparent}