:root{--blue:#173b67;--cyan:#22b8cf;--yellow:#f5b942;--red:#e76f67;--red-light:#fde9e7;--ink:#213349;--muted:#53657a;--pale:#f1f7fc;--line:#dbe5ef;color:var(--ink);font-synthesis:none;background:#fff;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,summary{font:inherit}button,summary{cursor:pointer}button{color:var(--blue)}:focus-visible{outline:3px solid var(--blue);outline-offset:5px}h1,h2,h3{color:var(--blue);letter-spacing:-.035em}h2{margin:10px 0 40px;font-size:clamp(1.65rem,3vw,2.25rem)}p{line-height:1.65}svg{flex-shrink:0}.container{width:min(1120px,100% - 48px);margin-inline:auto}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip{z-index:20;background:#fff;padding:12px;position:fixed;top:-100px;left:20px}.skip:focus{top:10px}header{background:var(--pale);border-bottom:1px solid #e6edf4}.header-inner{justify-content:space-between;align-items:center;gap:20px;width:min(1240px,100% - 48px);min-height:80px;margin:auto;display:flex}.brand{letter-spacing:-1.3px;color:#031e49;align-items:center;gap:10px;font-size:30px;font-weight:800;display:flex}.lab{color:#00aceb}.brand img{object-fit:contain;width:48px;height:48px}header nav{color:var(--blue);align-items:center;gap:28px;font-size:.95rem;font-weight:600;display:flex}header nav>a,summary{align-items:center;gap:8px;min-height:44px;display:flex}summary{list-style:none}summary::-webkit-details-marker{display:none}.topics-menu{position:relative}.menu-panel{border:1px solid var(--line);z-index:5;background:#fff;border-radius:12px;min-width:220px;padding:8px;position:absolute;top:100%;right:0;box-shadow:0 12px 30px #173b6714}.menu-panel a{border-radius:8px;justify-content:space-between;align-items:center;gap:20px;padding:16px 12px;display:flex}.menu-panel a:hover{background:var(--pale)}small{color:var(--muted);font-size:.75rem;font-weight:400}.search-toggle,.close-search{background:0 0;border:0;border-radius:8px;place-items:center;min-width:44px;min-height:44px;display:grid}.search-toggle:hover,.close-search:hover{background:#dfedf7}.hero{text-align:center;padding:88px 0 78px}.eyebrow{text-transform:uppercase;letter-spacing:.16em;color:var(--muted);margin:0 0 16px;font-size:.72rem;font-weight:750}.hero h1{letter-spacing:-.055em;margin:0;font-size:clamp(2.65rem,5.4vw,4.65rem);font-weight:750;line-height:1.15}.hero h1 span{text-decoration:underline;text-decoration-color:var(--cyan);text-underline-offset:10px;text-decoration-thickness:5px}.mobile-break{display:none}.hero-description{color:var(--muted);margin:30px 0 32px;font-size:clamp(1rem,2vw,1.2rem)}.home-search{text-align:left;max-width:650px;margin:auto}.search-input{color:var(--blue);border:1px solid #becfe0;border-radius:12px;align-items:center;gap:16px;padding:6px 22px;display:flex;box-shadow:0 4px 16px #173b6706}.search-input:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px #22b8cf30}input[type=search]{width:100%;min-width:0;color:var(--ink);background:0 0;border:0;padding:16px 0;font-size:16px}input::placeholder{color:#637387}.search-results:not(:empty){border:1px solid var(--line);background:#fff;border-radius:12px;margin-top:8px;padding:8px}.search-results a{border-radius:8px;flex-direction:column;gap:5px;padding:15px;display:flex}.search-results a:hover{background:var(--pale)}.search-results strong{color:var(--blue);font-size:1.1rem}.search-results span,.search-results p{color:var(--muted);font-size:.9rem}.search-results p{padding:4px 12px}.process-section{text-align:center;border-top:1px solid var(--line);padding:40px 0 66px}.process{grid-template-columns:repeat(6,1fr);margin:0;padding:0;list-style:none;display:grid}.process li{flex-direction:column;align-items:center;padding:0 10px;display:flex;position:relative}.process li:not(:last-child):after{content:"";background:#c8d9e7;width:calc(100% - 66px);height:1px;position:absolute;top:30px;left:calc(50% + 33px)}.phase-node{border:1px solid var(--line);background:var(--pale);width:62px;height:62px;color:var(--blue);border-radius:50%;place-items:center;display:grid}.phase-node.yellow{background:#fff7e5;border-color:#f0dbad}.phase-node.cyan{background:#eaf9fb;border-color:#b8e5ec}.process h3{letter-spacing:-.015em;margin:18px 0 5px;font-size:1rem}.process p{color:var(--muted);max-width:150px;margin:0;font-size:.82rem}.topics-section{text-align:center;padding:40px 0 90px}.topic-grid{grid-template-columns:minmax(0,420px);justify-content:center;display:grid}.topic-card{text-align:left;border:1px solid var(--line);background:#f8fbfd;border-radius:18px;padding:32px;transition:transform .18s,border-color .18s;position:relative;overflow:hidden}.topic-card:hover{border-color:var(--cyan);transform:translateY(-3px)}.code-icon{width:52px;height:52px;color:var(--blue);background:#e4f4f7;border-radius:12px;place-items:center;font-family:monospace;font-size:22px;font-weight:700;display:grid}.topic-card :is(h3,h4){margin:24px 0 10px;font-size:1.65rem}.topic-card p{color:var(--muted);margin:0 0 30px;font-size:1rem;position:relative}.card-link{color:var(--blue);justify-content:space-between;align-items:center;font-size:.9rem;font-weight:650;display:flex}.card-link span{font-size:1.4rem}.network-decoration{width:100px;fill:var(--cyan);stroke:var(--cyan);stroke-width:1.5px;opacity:.18;position:absolute;top:18px;right:16px}footer{background:var(--pale);border-top:1px solid var(--line)}.footer-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;width:min(1120px,100% - 48px);margin:auto;padding:35px 0;display:flex}.footer-brand{color:var(--blue);font-size:1.15rem;font-weight:800}.footer-inner nav{color:var(--muted);flex-wrap:wrap;gap:8px 24px;font-size:.85rem;display:flex}.footer-inner nav a{align-items:center;min-height:44px;display:flex}.footer-inner nav a:hover{text-decoration:underline}.footer-inner p{width:100%;color:var(--muted);margin:0;font-size:.75rem}dialog{border:1px solid var(--line);width:min(620px,100% - 32px);max-height:80dvh;color:var(--ink);border-radius:16px;padding:24px;overflow:auto}dialog::backdrop{background:#102e4b66}.dialog-top{justify-content:space-between;align-items:center;gap:15px;display:flex}.dialog-top h2{margin:0;font-size:1.3rem}.placeholder{max-width:850px;min-height:65vh;padding-block:64px 110px}.back-link{min-height:44px;color:var(--muted);align-items:center;font-size:.9rem;display:inline-flex}.placeholder h1{margin:30px 0 12px;font-size:clamp(2.4rem,6vw,3.6rem)}.intro{color:var(--muted);max-width:620px;font-size:1.15rem}.work-notice{border-left:3px solid var(--yellow);background:#fff9eb;border-radius:0 12px 12px 0;align-items:flex-start;gap:18px;margin-top:35px;padding:24px;display:flex}.work-notice>span{color:var(--yellow)}.work-notice h2{margin:0 0 4px;font-size:1.1rem}.work-notice p{color:var(--muted);margin:0}.contact-link{min-height:48px;color:var(--blue);text-decoration:underline;text-decoration-color:var(--cyan);text-underline-offset:6px;align-items:center;gap:24px;margin-top:24px;font-size:clamp(1.1rem,4vw,1.5rem);display:inline-flex}@media (width<=900px){.process{grid-template-columns:repeat(3,1fr);gap:32px 0}.process li:nth-child(3):after{display:none}.hero{padding-top:70px}.header-inner{min-height:72px}}@media (width<=600px){.container,.header-inner,.footer-inner{width:calc(100% - 36px)}.brand{gap:5px;font-size:24px}.brand img{width:36px;height:36px}header nav{gap:12px;font-size:.85rem}.teacher-nav{display:none!important}.hero{padding:55px 0}.hero h1{font-size:clamp(2.4rem,10vw,3.2rem)}.mobile-break{display:block}.hero-description{margin:24px 0}.search-input{gap:10px;padding-inline:14px}.process-section{padding:35px 0}.process{text-align:left;grid-template-columns:1fr;gap:0;max-width:310px;margin:auto}.process li{flex-direction:row;align-items:center;gap:20px;padding:0 0 27px}.process li:last-child{padding-bottom:0}.process li:not(:last-child):after{width:1px;height:27px;display:block;top:62px;left:30px}.phase-node{flex-shrink:0}.process h3{margin:0 0 3px}.process p{max-width:none}.topics-section{padding:35px 0 60px}.topic-card{padding:26px}.footer-inner{padding:25px 0}.footer-inner nav{gap:2px 18px}.footer-brand{width:100%}.placeholder{padding-block:36px 70px}.work-notice{padding:20px}.menu-panel{right:-55px}.dialog-top h2{font-size:1.1rem}}.brand .wordmark{width:130px;height:auto}.home-search input:focus-visible{outline:none}.home-search:focus-within .search-input{outline:3px solid var(--blue);outline-offset:3px}@media (width<=600px){.brand .wordmark{width:105px}}.overview-link{color:var(--blue);align-items:center;gap:12px;min-height:44px;margin-top:20px;font-size:.9rem;font-weight:600;display:inline-flex}.overview-link:hover{text-decoration:underline}.hero-description{max-width:620px;margin-inline:auto}.topics-section{scroll-margin-top:24px}.process-section{border:0;padding-top:20px}.process-section h2{margin-bottom:38px;font-size:1.6rem;font-weight:650}.phase-node,.phase-node.yellow,.phase-node.cyan{background:var(--blue);color:#fff;border:0;border-radius:12px;width:48px;height:48px}.phase-node.yellow{background:var(--yellow);color:var(--blue)}.phase-node.cyan{background:var(--cyan);color:var(--blue)}.process li:not(:last-child):after{background:#cedce9;width:calc(100% - 56px);height:2px;top:23px;left:calc(50% + 28px)}.process h3{margin-top:14px;font-size:.9rem;font-weight:550}.process{row-gap:32px}.hero{padding-bottom:60px}@media (width<=600px){.hero-description{max-width:310px}.process{max-width:280px}.process li{gap:22px;padding-bottom:28px}.process h3{margin:0;font-size:1rem}.process li:not(:last-child):after{width:2px;height:28px;top:48px;left:23px}.process-section h2{font-size:1.45rem}}@media (width>=601px) and (width<=900px){.process{text-align:left;grid-template-columns:1fr;gap:0;max-width:310px;margin:auto}.process li{flex-direction:row;align-items:center;gap:22px;padding-bottom:25px}.phase-node{flex-shrink:0}.process h3{margin:0;font-size:1rem}.process li:not(:last-child):after{width:2px;height:25px;display:block;top:48px;left:23px}.process li:last-child{padding-bottom:0}}.process.reveal-ready li{opacity:0;transform:translateY(7px)}.process.reveal-ready.revealed li{opacity:1;transition:opacity .45s,transform .45s;transition-delay:calc(var(--step) * .18s);transform:translateY(0)}.process{grid-template-columns:repeat(3,minmax(0,1fr));max-width:900px;margin:auto}.theme-toggle{background:0 0;border:0;border-radius:8px;align-items:center;gap:8px;min-height:44px;padding:8px;display:flex}.switch-track{background:#b9c9d9;border-radius:20px;width:36px;height:22px;padding:3px;display:block}.switch-track span{background:#fff;border-radius:50%;width:16px;height:16px;transition:transform .15s;display:block}.theme-toggle[aria-checked=true] .switch-track{background:var(--cyan)}.theme-toggle[aria-checked=true] .switch-track span{transform:translate(14px)}:root{color-scheme:light}:root[data-theme=dark]{color-scheme:dark;--blue:#bdd9fb;--ink:#e7edf5;--muted:#aebed0;--pale:#172334;--line:#314359;color:var(--ink);background:#101923}[data-theme=dark] header{border-color:var(--line)}[data-theme=dark] .wordmark{filter:brightness(0)invert()}[data-theme=dark] .topic-card{background:#172334}[data-theme=dark] .code-icon{color:#bdeef5;background:#203e48}[data-theme=dark] .search-input{border-color:#52647a}[data-theme=dark] .search-results:not(:empty),[data-theme=dark] dialog{background:#172334}[data-theme=dark] input::placeholder{color:#aebed0}[data-theme=dark] .phase-node.blue{color:#e7edf5;background:#173b67}[data-theme=dark] .phase-node.cyan,[data-theme=dark] .phase-node.yellow{color:#173b67}[data-theme=dark] .work-notice{background:#2d291f}[data-theme=dark] .skip{background:#172334}[data-theme=dark] .search-toggle:hover,[data-theme=dark] .close-search:hover{background:#283b50}[data-theme=dark] .process li:after{background:#425770}@media (width<=900px){.process{text-align:center;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;max-width:900px}.process li{flex-direction:column;padding:0 10px}.process h3{margin-top:14px;font-size:.9rem}.process li:not(:last-child):after{width:calc(100% - 56px);height:2px;top:23px;left:calc(50% + 28px)}.process li:nth-child(3):after{display:none}}@media (width<=600px){.process{text-align:left;grid-template-columns:1fr;max-width:310px}.process li{flex-direction:row;gap:22px;padding:0 0 28px}.process h3{margin:0;font-size:1rem}.process li:not(:last-child):after{width:2px;height:28px;top:48px;left:23px}.process li:last-child{padding-bottom:0}header nav{gap:6px}.brand .wordmark{width:95px}.theme-toggle{gap:5px;padding:4px}}.theme-moon,.theme-sun,[data-theme=dark] .theme-moon,[data-theme=dark] .theme-sun{display:block}.hero h1 .hero-word{text-decoration:none;display:inline-block}.hero h1 .hero-accent{text-decoration:underline;text-decoration-color:var(--cyan);text-underline-offset:10px;text-decoration-thickness:5px}.hero-animate{animation:.9s both hero-in}@keyframes hero-in{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}.process.reveal-ready li{opacity:1;transform:none}.hero-animate{opacity:1;animation:none;transform:none}}.process{grid-template-columns:repeat(4,minmax(0,1fr))}.process li:nth-child(3):after{display:block}.topics-reveal-ready{opacity:0;transform:translateY(5px)}.topics-reveal-ready.topics-revealed{opacity:1;transition:opacity .9s,transform .9s;transform:translateY(0)}@media (width<=600px){.process{grid-template-columns:1fr}}@media (prefers-reduced-motion:reduce){.topics-reveal-ready{opacity:1;transform:none}}.footer-identity{flex-direction:column;gap:2px;display:flex}.footer-identity p{margin:0}.footer-identity .footer-brand{width:auto}@media (width<=600px){.footer-identity{width:100%}}.legal-content{max-width:720px;margin-top:36px}.legal-content h2{margin:36px 0 14px;font-size:1.4rem}.legal-content p{color:var(--ink);margin:0 0 18px}.legal-content address{font-style:normal;line-height:1.8}.legal-content a{text-underline-offset:3px;overflow-wrap:anywhere;text-decoration:underline}.legal-content .legal-date{color:var(--muted);font-size:.9rem}.topic-grid{text-align:left;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.topic-status{color:var(--blue);background:#e4f4f7;border-radius:6px;padding:5px 10px;font-size:.78rem;font-weight:650;display:inline-block}.topic-card{flex-direction:column;display:flex}.topic-card .card-link{margin-top:auto}.topic-planned{background:#f3f4f6;border-color:#e0e3e7;transition:none}.topic-planned:hover{border-color:#e0e3e7;transform:none}.topic-planned :is(h3,h4){color:#596471}.topic-planned p{color:#626c78}.topic-planned .topic-status{color:#596471;background:#e5e8ec}.search-planned{color:var(--muted);border-radius:8px;flex-direction:column;gap:5px;padding:15px;display:flex}[data-theme=dark] .topic-planned{background:#1b222c;border-color:#35404e}[data-theme=dark] .topic-planned:hover{border-color:#35404e}[data-theme=dark] .topic-planned :is(h3,h4),[data-theme=dark] .topic-planned p{color:#abb6c4}[data-theme=dark] .topic-planned .topic-status{color:#c1cad6;background:#303a47}[data-theme=dark] .topic-status{color:#bdeef5;background:#203e48}@media (width<=600px){.topic-grid{grid-template-columns:1fr}}.topic-card .topic-status{align-self:flex-start}.topic-card .code-icon{margin-bottom:18px}.topics-section.container{width:min(1440px,100% - 48px)}.topic-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:20px}.topic-card{padding:26px}.topic-card :is(h3,h4){overflow-wrap:anywhere;margin:18px 0 10px;font-size:1.35rem;line-height:1.25}.topic-card p{margin-bottom:20px;font-size:.95rem}@media (width<=600px){.topics-section.container{width:calc(100% - 32px)}.topic-card{padding:24px}.topics-reveal-ready.topics-revealed{transition-duration:.2s}}.topic-card.topic-reveal-ready{opacity:0;transition:opacity .6s,translate .6s;translate:0 6px}.topic-card.topic-reveal-ready.topic-visible{opacity:1;translate:0}@media (width<=600px){.topic-card.topic-reveal-ready{transition-duration:.6s}}@media (prefers-reduced-motion:reduce){.topic-card.topic-reveal-ready{opacity:1;transition:none;translate:none}}.topics-toolbar{text-align:left;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px;display:flex}.topics-toolbar h2{margin:0}.topic-sort{color:var(--muted);align-items:center;gap:12px;font-size:.9rem;display:flex}.topic-sort select{font:inherit;border:1px solid var(--line);background:var(--pale);max-width:100%;min-height:44px;color:var(--ink);border-radius:8px;padding:10px 34px 10px 12px}.topic-group-heading{letter-spacing:0;color:var(--muted);grid-column:1/-1;margin:18px 0 0;font-size:1.1rem;font-weight:600}@media (width<=600px){.topics-toolbar{flex-direction:column;align-items:flex-start;gap:18px}.topic-sort{justify-content:space-between;width:100%}.topic-group-heading{font-size:1rem}}@media (width>=901px){.topics-toolbar{margin-bottom:12px}.topic-grid{gap:14px 20px}.topic-group-heading{margin:12px 0 0}.topic-card{padding:20px}.topic-card :is(h3,h4){margin:12px 0 8px;font-size:1.2rem}.topic-card p{margin-bottom:0;font-size:.9rem;line-height:1.5}.topic-card .code-icon{width:32px;height:32px;margin:0;font-size:16px;position:absolute;top:16px;right:18px}.topic-card .card-link{padding-top:12px;font-size:.85rem}}