@layer theme{:root,:host{--font-sans:ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--spacing:.25rem;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring{outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.relative{position:relative}.static{position:static}.start{inset-inline-start:var(--spacing)}.table{display:table}}:root{--ink:#0c253a;--ink-soft:#42566a;--cyan:#08a9dd;--cyan-dark:#007da8;--cyan-pale:#e9f9fe;--yellow:#ffd938;--paper:#fff;--fog:#f3f7f9;--line:#c9d7df;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);text-rendering:optimizelegibility;margin:0;font-family:Yu Gothic,Hiragino Sans,Noto Sans JP,system-ui,sans-serif;line-height:1.8}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button,a{-webkit-tap-highlight-color:transparent}.site-header{z-index:20;min-height:76px;padding:10px max(24px, calc((100vw - var(--max)) / 2));-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#fffffff0;border-bottom:1px solid #0c253a21;justify-content:space-between;align-items:center;display:flex;position:sticky;top:0}.brand{align-items:center;gap:11px;display:flex}.brand img{border-radius:50%}.brand span{line-height:1.25;display:grid}.brand strong{letter-spacing:.04em;font-size:14px}.brand small{color:var(--ink-soft);letter-spacing:.12em;margin-top:3px;font:9px/1.2 Consolas,monospace}nav{align-items:center;gap:28px;display:flex}nav a{font-size:13px;font-weight:700;position:relative}nav a:after{content:"";background:var(--cyan);height:2px;transition:right .2s;position:absolute;bottom:-7px;left:0;right:100%}nav a:hover:after,nav a:focus-visible:after{right:0}.hero{isolation:isolate;min-height:calc(100vh - 76px);padding:72px max(24px, calc((100vw - var(--max)) / 2)) 86px;background:linear-gradient(112deg,#fff 0 54%,#effaff 54% 100%);grid-template-columns:minmax(0,1.05fr) minmax(380px,.95fr);align-items:center;gap:72px;display:grid;position:relative;overflow:hidden}.hero-grid{z-index:-1;opacity:.24;background-image:linear-gradient(#0c253a14 1px,#0000 1px),linear-gradient(90deg,#0c253a14 1px,#0000 1px);background-size:44px 44px;position:absolute;inset:0;-webkit-mask-image:linear-gradient(90deg,#0000 0,#000 45% 100%);mask-image:linear-gradient(90deg,#0000 0,#000 45% 100%)}.hero-copy{max-width:660px}.eyebrow{letter-spacing:.08em;align-items:center;gap:10px;margin-bottom:22px;font-size:12px;font-weight:800;display:inline-flex}.eyebrow span{background:var(--ink);color:#fff;letter-spacing:.12em;padding:5px 9px 4px;font:700 10px/1.3 Consolas,monospace}.hero-catch{color:var(--cyan-dark);letter-spacing:.03em;margin:0 0 16px;font-size:clamp(18px,2vw,25px);font-weight:800;line-height:1.6}h1{letter-spacing:-.035em;margin:0;font-size:clamp(38px,5.2vw,70px);line-height:1.22}h1 em{color:var(--ink);white-space:nowrap;font-style:normal}.hero-lead{max-width:600px;color:var(--ink-soft);margin:28px 0 0;font-size:16px;line-height:2}.hero-actions{flex-wrap:wrap;gap:12px;margin-top:34px;display:flex}.button{border:1px solid var(--ink);justify-content:center;align-items:center;gap:14px;min-height:52px;padding:0 24px;font-size:14px;font-weight:800;transition:transform .18s,box-shadow .18s,background .18s;display:inline-flex}.button:hover,.button:focus-visible{transform:translateY(-2px);box-shadow:0 8px #0c253a21}.button.primary{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}.button.secondary{background:#fff}.book-meta{flex-wrap:wrap;gap:8px 22px;margin:36px 0 0;display:flex}.book-meta div{align-items:baseline;gap:8px;display:flex}.book-meta dt{color:var(--cyan-dark);letter-spacing:.08em;text-transform:uppercase;font:700 10px/1 Consolas,monospace}.book-meta dd{margin:0;font-size:11px;font-weight:700}.book-stage{justify-items:center;padding:34px 20px 20px;display:grid;position:relative}.terminal-tag{background:var(--ink);color:#fff;box-shadow:8px 8px 0 var(--yellow);padding:7px 12px;font:11px/1.4 Consolas,monospace;position:absolute;top:0;left:0;transform:rotate(-2deg)}.book-wrap{perspective:1300px;filter:drop-shadow(24px 30px 24px #0c253a38);width:min(390px,78vw);position:relative;transform:rotate(1deg)}.book-cover{z-index:2;transform-origin:0;border:1px solid #d7e0e5;width:100%;height:auto;position:relative;transform:rotateY(-5deg)}.book-spine{z-index:1;background:linear-gradient(90deg,#8b9ba5,#e7edf0 48%,#778b98);width:18px;position:absolute;top:4px;bottom:-4px;left:-11px;transform:rotateY(22deg)}.edition-stamp{z-index:3;border:2px solid var(--ink);background:var(--yellow);text-align:center;border-radius:50%;place-content:center;width:104px;height:104px;display:grid;position:absolute;bottom:2px;right:-10px;transform:rotate(9deg);box-shadow:5px 6px #0c253a29}.edition-stamp strong{font:800 11px/1.2 Consolas,monospace}.edition-stamp span{margin-top:5px;font:10px/1 Consolas,monospace}.section{max-width:var(--max);margin:0 auto;padding:112px 24px}.section-heading{max-width:780px;margin-bottom:48px}.section-number{color:var(--cyan-dark);letter-spacing:.14em;margin:0 0 14px;font:700 11px/1.3 Consolas,monospace}.section-number.light{color:#70d8f4}h2{letter-spacing:-.025em;margin:0;font-size:clamp(30px,4vw,50px);line-height:1.35}.section-heading>p:last-child{color:var(--ink-soft)}.discovery-grid{border:1px solid var(--line);grid-template-columns:repeat(4,1fr);display:grid}.discovery-card{border-right:1px solid var(--line);background:#fff;min-height:330px;padding:28px 24px;position:relative;overflow:hidden}.discovery-card:last-child{border-right:0}.discovery-card:after{content:"";border:1px solid var(--cyan);opacity:.23;border-radius:50%;width:130px;height:130px;position:absolute;inset:auto -36px -42px auto}.card-number{color:var(--cyan-dark);font:700 11px/1 Consolas,monospace}.card-symbol{border:2px solid var(--ink);background:var(--cyan-pale);width:68px;height:68px;box-shadow:7px 7px 0 var(--cyan);place-content:center;margin:28px 0 22px;font-size:26px;font-weight:900;display:grid}.discovery-card h3{margin:0 0 5px;font-size:23px}.discovery-card code{color:var(--cyan-dark);font-size:10px}.discovery-card p{color:var(--ink-soft);margin:18px 0 0;font-size:13px;line-height:1.85}.book-detail{background:var(--ink);color:#fff;grid-template-columns:1.45fr .75fr;max-width:none;padding:0;display:grid}.detail-panel{padding:96px max(48px, calc((100vw - var(--max)) / 2 + 24px));padding-right:72px}.detail-intro{color:#cbd9e1;max-width:760px}.topic-list{border-top:1px solid #385064;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 34px;margin:42px 0 0;padding:0;list-style:none;display:grid}.topic-list li{border-bottom:1px solid #385064;align-items:center;gap:14px;padding:16px 0;font-size:14px;font-weight:700;display:flex}.topic-list span{color:#70d8f4;font:11px/1 Consolas,monospace}.rules-panel{background:var(--yellow);color:var(--ink);flex-direction:column;justify-content:center;padding:72px 48px;display:flex}.mono-label{letter-spacing:.16em;font:700 10px/1.3 Consolas,monospace}.rules-panel blockquote{margin:28px 0;padding:0;font-size:clamp(25px,3vw,38px);font-weight:900;line-height:1.55}.rules-panel>p:not(.mono-label){font-size:13px}.safe-badge{border:1px solid var(--ink);align-self:flex-start;margin-top:24px;padding:8px 12px;font-size:11px;font-weight:800}.safe-badge span{border-right:1px solid var(--ink);margin-right:9px;padding-right:9px;font-family:Consolas,monospace}.download-section{grid-template-columns:.85fr 1.15fr;align-items:center;gap:70px;display:grid}.download-copy>p:not(.section-number){color:var(--ink-soft)}.download-notes{margin:28px 0 0;padding:0;list-style:none}.download-notes li{border-bottom:1px solid var(--line);color:var(--ink-soft);padding:8px 0;font:11px/1.6 Consolas,Yu Gothic,monospace}.download-card{border:1px solid var(--line);background:var(--fog);box-shadow:12px 12px 0 var(--cyan-pale);grid-template-columns:88px 1fr;gap:18px 20px;padding:30px;display:grid}.file-icon{border:2px solid var(--ink);width:88px;height:104px;color:var(--cyan-dark);clip-path:polygon(0 0,70% 0,100% 23%,100% 100%,0 100%);background:#fff;grid-row:span 2;place-content:center;font:900 21px/1 Consolas,monospace;display:grid}.file-info{align-self:center;min-width:0}.file-info strong{overflow-wrap:anywhere;font:700 14px/1.5 Consolas,monospace;display:block}.file-info span{color:var(--ink-soft);font-size:11px}.download-button{background:var(--cyan);border-color:var(--cyan);grid-column:2}.download-card details{border-top:1px solid var(--line);grid-column:1/-1;padding-top:16px;font-size:11px}.download-card summary{cursor:pointer;font-weight:800}.download-card details code{background:#fff;margin:10px 0;padding:10px;font-size:9px;display:block;overflow-x:auto}.download-card details a{text-decoration:underline}.support-section{padding-top:36px}.status-card{border:1px solid var(--line);grid-template-columns:14px 1fr auto;align-items:center;gap:18px;margin-top:32px;padding:26px 30px;display:grid}.status-dot{background:#28a76f;border-radius:50%;width:11px;height:11px;box-shadow:0 0 0 6px #dff5eb}.status-card strong{font-size:16px}.status-card p{color:var(--ink-soft);margin:2px 0 0;font-size:12px}.status-card time{color:var(--ink-soft);font:10px/1.5 Consolas,monospace}.links-section{max-width:none;padding-left:max(24px, calc((100vw - var(--max)) / 2));padding-right:max(24px, calc((100vw - var(--max)) / 2));background:var(--cyan-pale)}.links-intro{align-items:center;gap:24px;display:flex}.links-intro img{box-shadow:0 0 0 7px white, 0 0 0 8px var(--line);border-radius:50%}.links-intro h2{font-size:clamp(28px,4vw,44px)}.links-intro p:last-child{color:var(--ink-soft);margin-bottom:0}.social-grid{border:1px solid var(--line);background:#fff;grid-template-columns:repeat(3,1fr);margin-top:46px;display:grid}.social-grid a{border-right:1px solid var(--line);padding:26px;transition:background .18s;display:grid;position:relative}.social-grid a:last-child{border-right:0}.social-grid a:hover,.social-grid a:focus-visible{background:var(--yellow)}.social-label{color:var(--cyan-dark);font:800 12px/1 Consolas,monospace}.social-grid strong{overflow-wrap:anywhere;margin-top:8px;font-size:13px}.external-arrow{font-size:22px;position:absolute;top:22px;right:22px}footer{background:var(--ink);color:#fff;text-align:center;padding:70px 24px}.footer-brand{font-size:20px;font-weight:900}footer p{color:#b8cad5;margin:12px 0 24px;font-size:13px}footer small{color:#7990a0;font:10px/1.4 Consolas,monospace}:focus-visible{outline:3px solid var(--yellow);outline-offset:4px}@media (max-width:980px){.hero{grid-template-columns:1fr .72fr;gap:34px}.discovery-grid{grid-template-columns:repeat(2,1fr)}.discovery-card:nth-child(2){border-right:0}.discovery-card:nth-child(-n+2){border-bottom:1px solid var(--line)}.book-detail{grid-template-columns:1fr}.detail-panel{padding:82px 40px}.rules-panel{padding:64px 40px}.download-section{gap:34px}}@media (max-width:760px){.site-header{min-height:68px;position:relative}nav{display:none}.hero{background:linear-gradient(165deg,#fff 0 53%,#effaff 53% 100%);grid-template-columns:1fr;padding-top:56px}.hero-copy{text-align:left}h1 em{white-space:normal}.book-stage{margin-top:18px}.terminal-tag{left:12px}.section{padding-top:78px;padding-bottom:78px}.download-section{grid-template-columns:1fr}.status-card{grid-template-columns:14px 1fr}.status-card time{grid-column:2}.links-intro{align-items:flex-start}.social-grid{grid-template-columns:1fr}.social-grid a{border-right:0;border-bottom:1px solid var(--line)}.social-grid a:last-child{border-bottom:0}}@media (max-width:520px){.brand small{display:none}.hero-actions,.button{width:100%}.book-meta{display:grid}.discovery-grid{grid-template-columns:1fr}.discovery-card{border-right:0;border-bottom:1px solid var(--line);min-height:290px}.discovery-card:last-child{border-bottom:0}.topic-list{grid-template-columns:1fr}.detail-panel,.rules-panel{padding:62px 24px}.download-card{grid-template-columns:66px 1fr;padding:22px}.file-icon{width:66px;height:80px;font-size:16px}.download-button{grid-column:1/-1}.links-intro{display:grid}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition-duration:.01ms!important}}