:root{color-scheme:light;--bg: #ffffff;--bg-soft: #f8fafc;--panel: #ffffff;--panel-soft: #f8fafc;--ink: #0f172a;--text: #334155;--muted: #64748b;--line: #e2e8f0;--line-soft: #f1f5f9;--brand: #4338ca;--brand-strong: #3730a3;--brand-soft: #eef2ff;--success: #22c55e;--rose: #e11d48;--footer: #f8fafc}*{box-sizing:border-box}html{background:var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}body{margin:0;min-height:100vh;line-height:1.6}a{color:inherit;text-decoration:none}a:focus-visible{border-radius:12px;outline:2px solid var(--brand);outline-offset:4px}.site-header{background:#fffffff2;backdrop-filter:blur(16px);border-bottom:1px solid transparent;position:sticky;top:0;z-index:20}.nav{align-items:center;display:flex;gap:24px;height:64px;justify-content:space-between;margin:0 auto;max-width:1280px;padding:0 24px}.brand{align-items:center;display:inline-flex;gap:14px;min-width:0}.blog-label{border-left:1px solid var(--line);color:var(--muted);font-size:.9rem;font-weight:800;padding-left:14px}.logo{align-items:center;display:inline-flex;gap:12px;line-height:1}.logo-mark{display:block;height:48px;width:auto}.logo-wordmark{font-size:1.45rem;font-weight:900;white-space:nowrap}.logo-level{color:var(--ink)}.logo-kana{color:var(--brand)}.logo-bubble{fill:var(--panel)}.logo-ink{fill:var(--ink)}.logo-invert .logo-level{color:#fff}.logo-invert .logo-ink{fill:#0f172a}.logo-invert .logo-bubble{fill:#fff}.nav-links{align-items:center;display:flex;gap:28px;font-size:.9rem;font-weight:700}.nav-links a:not(.nav-cta){color:#475569}.nav-links a:not(.nav-cta):hover{color:var(--brand-strong)}.nav-cta{background:var(--brand);border-radius:12px;color:#fff;padding:8px 16px}.nav-cta:hover{background:var(--brand-strong)}.hero{background:radial-gradient(circle at 80% 18%,rgb(199 210 254 / 48%),transparent 34%),linear-gradient(135deg,#fff,#f8fafc 55%,#eef2ff);border-bottom:1px solid 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14px}.status-pill span{background:var(--success);border-radius:999px;display:inline-block;height:8px;width:8px}.eyebrow{color:var(--brand-strong);display:block;font-size:.78rem;font-weight:900;margin-bottom:12px;text-transform:uppercase}h1,h2,h3{line-height:1.1;margin:0}h1{font-size:clamp(3rem,6vw,5.5rem);font-weight:900;max-width:780px}.hero h1 span{background:linear-gradient(90deg,#4f46e5,#0891b2);background-clip:text;color:transparent}h2{color:var(--ink);font-size:clamp(2rem,4vw,2.65rem);font-weight:900}h3{color:var(--ink);font-size:1.18rem;font-weight:800}.lede{color:var(--muted);font-size:1.2rem;line-height:1.7;margin:24px 0 0;max-width:680px}.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px}.primary-action,.secondary-action{align-items:center;border-radius:12px;display:inline-flex;font-size:1rem;font-weight:800;justify-content:center;min-height:52px;padding:0 22px}.primary-action{background:var(--brand);box-shadow:0 18px 40px #6366f147;color:#fff}.primary-action:hover{background:var(--brand-strong)}.secondary-action{background:#fff;border:1px solid var(--line);color:var(--ink)}.secondary-action:hover{border-color:#c7d2fe;color:var(--brand-strong)}.hero-visual{align-self:center;background:#ffffffb8;border:1px solid white;border-radius:16px;box-shadow:0 24px 70px #0f172a1f;padding:22px}.notebook{background:#fff;border-radius:16px;display:grid;gap:18px;padding:26px}.notebook-row{align-items:center;display:grid;gap:14px;grid-template-columns:54px 1fr}.kana-tile{align-items:center;background:var(--brand);border-radius:12px;color:#fff;display:flex;font-size:1.5rem;font-weight:900;height:54px;justify-content:center}.note-line{background:#e2e8f0;border-radius:999px;height:12px}.note-line.short{width:66%}.note-line.green{background:#bbf7d0}.content{background:var(--bg);margin:0 auto;max-width:1280px;padding:88px 24px 104px}.section-heading{display:flex;justify-content:space-between;margin-bottom:32px}.section-heading p{color:var(--muted);font-size:1.08rem;margin:12px 0 0}.post-grid{display:grid;gap:22px;grid-template-columns:repeat(3,minmax(0,1fr))}.guide-index{padding-bottom:32px}.guide-index+.content{padding-top:32px}.guide-group-grid{display:grid;gap:22px;grid-template-columns:repeat(4,minmax(0,1fr))}.guide-group-card{background:var(--panel-soft);border:1px solid var(--line-soft);border-radius:18px;display:flex;flex-direction:column;gap:22px;min-height:100%;padding:24px}.guide-group-card p{color:var(--muted);margin:12px 0 0}.guide-group-card ul{display:grid;gap:12px;list-style:none;margin:auto 0 0;padding:0}.guide-group-card a{color:var(--brand-strong);font-weight:850;text-decoration:underline;text-underline-offset:.22em}.guide-group-card a:hover{color:#3730a3}.post-card{background:var(--panel);border:1px solid var(--line-soft);border-radius:16px;box-shadow:0 8px 28px 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h2{color:var(--ink);font-size:1.55rem;font-weight:900;margin-top:44px}.article-shell p,.article-shell li{color:var(--text);font-size:1.08rem}.article-content{margin-top:42px}.article-content h2{border-top:1px solid var(--line-soft);padding-top:34px}.article-content h3{font-size:1.18rem;margin-top:30px}.article-content p{margin:18px 0 0}.article-content ul,.article-content ol{color:var(--text);margin:18px 0 0;padding-left:26px}.article-content li+li{margin-top:8px}.article-content strong{color:var(--ink)}.article-content blockquote{background:var(--panel-soft);border-left:4px solid var(--brand);border-radius:0 16px 16px 0;color:var(--text);margin:28px 0;padding:18px 22px}.article-content pre{background:#111827;border:1px solid #1f2937;border-radius:18px;box-shadow:0 18px 42px #0f172a24;color:#e5e7eb;font-size:.98rem;line-height:1.75;margin:24px 0 32px;overflow-x:auto;padding:22px 24px;white-space:pre}.article-content pre 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span:last-child{max-width:min(100%,560px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.back-link{color:var(--brand-strong);font-weight:800}.back-link:hover{color:#3730a3}.related-guides{border-top:1px solid var(--line-soft);margin-top:56px;padding-top:40px}.related-guides h2{font-size:1.55rem;margin:0 0 22px}.related-guide-grid{display:grid;gap:16px;grid-template-columns:repeat(3,minmax(0,1fr))}.related-guide-card{background:var(--panel-soft);border:1px solid var(--line-soft);border-radius:16px;display:flex;flex-direction:column;min-height:100%;padding:20px;text-decoration:none!important}.related-guide-card:hover{border-color:#c7d2fe;box-shadow:0 14px 36px #0f172a14}.related-guide-card h3{font-size:1rem}.related-guide-card p{color:var(--muted);font-size:.95rem;margin:10px 0 0}.related-guide-card span{color:var(--brand-strong);font-size:.88rem;font-weight:900;margin-top:auto;padding-top:18px}.product-link{display:inline-flex;margin-top:24px}.product-link-stack{background:linear-gradient(135deg,#eef2ff,#f5f3ff);border:1px solid #c7d2fe;border-radius:22px;color:var(--text);display:block;padding:24px}.product-link-stack h3{font-size:1.25rem;margin:8px 0}.product-link-stack p{color:var(--muted);margin:0}.product-link-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}.product-link-actions a{align-items:center;background:#4f46e5;border-radius:999px;color:#fff!important;display:inline-flex;font-weight:900;padding:10px 14px;text-decoration:none!important}.product-link-actions a+a{background:#fff;color:#3730a3!important}.site-footer{background:var(--footer);border-top:1px solid var(--line-soft);color:var(--muted);padding:64px 24px 32px}.footer-inner{display:grid;gap:40px;grid-template-columns:minmax(0,1fr) auto;margin:0 auto;max-width:1280px}.footer-inner p{max-width:340px}.footer-links{align-items:start;display:grid;gap:10px;grid-template-columns:repeat(2,minmax(110px,1fr))}.footer-links a:hover{color:var(--brand-strong)}.footer-bottom{border-top:1px solid var(--line);font-size:.9rem;margin:48px auto 0;max-width:1280px;padding-top:28px;text-align:center}@media(max-width:920px){.hero{grid-template-columns:1fr;padding-bottom:72px;padding-top:72px}.post-grid,.guide-group-grid,.related-guide-grid,.footer-inner{grid-template-columns:1fr}}@media(max-width:680px){.nav{align-items:center;height:64px}.nav-links{margin-left:auto}.nav-links a:not(.nav-cta){display:none}.blog-label{display:none}.hero,.content,.article-shell{padding-left:18px;padding-right:18px}.hero-visual{padding:14px}.article-content pre{border-radius:14px;margin:20px -2px 28px;padding:18px 16px}.notebook{padding:18px}}@media(max-width:520px){.logo-mark{height:42px}.logo-wordmark{font-size:1.22rem}.nav-links{font-size:.84rem}.hero-actions{flex-direction:column}.primary-action,.secondary-action{width:100%}}.skip-link{background:var(--ink);border-radius:0 0 10px 10px;color:#fff;font-weight:800;left:16px;padding:10px 16px;position:fixed;top:0;transform:translateY(-130%);transition:transform .12s ease;z-index:100}.skip-link:focus{transform:translateY(0)}.mobile-menu{display:none;position:relative}.mobile-menu summary{align-items:center;border:1px solid var(--line);border-radius:10px;cursor:pointer;display:flex;font-size:.88rem;font-weight:800;gap:8px;list-style:none;min-height:42px;padding:0 12px}.mobile-menu 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.hero-actions{margin-top:28px}.latest-section{padding-bottom:44px;padding-top:64px}.topic-overview{padding-bottom:48px;padding-top:44px}.all-guides{padding-bottom:88px;padding-top:48px}.section-link{align-self:end;color:var(--brand-strong);font-weight:850;text-decoration:underline;text-underline-offset:.2em}.featured-post-grid .post-card{min-height:250px}.featured-post-grid .read-more{margin-top:auto;padding-top:20px}.goal-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}.goal-card{background:var(--panel-soft);border:1px solid var(--line);border-radius:14px;display:grid;gap:5px;padding:18px}.goal-card:hover{border-color:#a5b4fc;box-shadow:0 10px 28px #0f172a12}.goal-card>span{color:var(--brand-strong);font-size:.75rem;font-weight:850;text-transform:uppercase}.goal-card strong{color:var(--ink);font-size:1.05rem}.goal-card p{color:var(--muted);font-size:.9rem;line-height:1.45;margin:2px 0 0}.topic-sections{border:1px solid var(--line);border-radius:16px;overflow:hidden}.topic-section+.topic-section{border-top:1px solid var(--line)}.topic-section{scroll-margin-top:84px}.topic-section>summary{align-items:center;background:#fff;cursor:pointer;display:flex;gap:20px;justify-content:space-between;list-style-position:inside;padding:18px 22px}.topic-section>summary:hover{background:var(--bg-soft)}.topic-section summary>span:first-child{display:inline-grid;gap:3px}.topic-section summary strong{color:var(--ink)}.topic-section summary small{color:var(--muted);font-size:.86rem;font-weight:500}.topic-count{background:var(--brand-soft);border-radius:999px;color:var(--brand-strong);font-size:.8rem;font-weight:850;min-width:30px;padding:3px 9px;text-align:center}.article-link-list{border-top:1px solid var(--line-soft);list-style:none;margin:0;padding:4px 22px 12px}.article-link-list li+li{border-top:1px solid var(--line-soft)}.article-link-list a{align-items:baseline;color:var(--brand-strong);display:flex;font-weight:750;gap:18px;justify-content:space-between;padding:12px 0}.article-link-list small{color:var(--muted);flex:0 0 auto;font-weight:650}.article-shell{max-width:780px}.article-shell .lede{max-width:68ch}.article-byline{display:flex;flex-wrap:wrap;gap:6px 14px;margin:18px 0 0}.article-byline span{position:relative}.article-byline span+span:before{color:var(--line);content:"•";margin-right:14px}.article-byline a{font-weight:800}.article-content{overflow-wrap:anywhere}.article-content h2,.article-content h3{scroll-margin-top:84px}.table-scroll{margin-top:24px;max-width:100%;overflow-x:auto;overscroll-behavior-inline:contain;scrollbar-width:thin}.table-scroll:focus-visible{border-radius:10px;outline:2px solid var(--brand);outline-offset:4px}.table-scroll table{margin-top:0;min-width:100%;width:max-content}.table-scroll th,.table-scroll td{min-width:9rem}.table-scroll-hint{color:var(--muted)!important;display:none;font-size:.82rem!important;font-weight:750;margin:22px 0 -14px!important}.article-toc{background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;margin-top:30px;padding:0 18px}.article-toc summary{color:var(--ink);cursor:pointer;font-weight:850;padding:14px 0}.article-toc summary span{color:var(--brand-strong);display:inline-block;margin-left:5px;transition:transform .12s ease}.article-toc:not([open]) summary span{transform:rotate(-90deg)}.article-toc ol{columns:2;gap:32px;margin:0;padding:0 0 16px 20px}.article-toc li{break-inside:avoid;font-size:.93rem;margin:0 0 7px;padding-right:10px}.article-final-cta{margin-top:52px}.article-final-cta h2{font-size:1.3rem;margin:0 0 8px}.article-final-cta .eyebrow{margin-bottom:8px}@media(max-width:920px){.goal-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:680px){.nav-links-desktop{display:none}.mobile-menu{display:block;margin-left:auto}.home-hero{padding-bottom:48px;padding-top:48px}.latest-section,.topic-overview,.all-guides{padding-bottom:38px;padding-top:38px}.section-heading{display:grid;gap:14px}.section-link{justify-self:start}.goal-grid{grid-template-columns:1fr}.goal-card{padding:15px 16px}.topic-section>summary{padding:15px 16px}.topic-section summary small{display:none}.article-link-list{padding-left:16px;padding-right:16px}.article-link-list a{align-items:start;flex-direction:column;gap:2px}.article-toc ol{columns:1}.article-content table{margin-right:0}.table-scroll-hint:not([hidden]){display:block}}