:root{color-scheme:light;--bg:#fff;--surface:#f6f8fb;--text:#172235;--muted:#617085;--line:#e5eaf1;--blue:#245bdb;--soft:#edf3ff;--font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
html.dark{color-scheme:dark;--bg:#111722;--surface:#192230;--text:#e8edf5;--muted:#a6b3c6;--line:#2c3849;--blue:#91b4ff;--soft:#243450}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.7 var(--font);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}[hidden]{display:none!important}a,button{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:4px}::selection{background:var(--soft);color:var(--blue)}html{scroll-behavior:smooth;scroll-padding-top:100px}.skip-link{position:fixed;left:20px;top:-80px;z-index:500;background:var(--bg);padding:12px 20px;border:1px solid var(--blue)}.skip-link:focus{top:12px}.topbar{position:sticky;top:0;z-index:100;background:var(--bg);border-bottom:1px solid var(--line)}.header-inner{max-width:1280px;min-height:76px;padding:0 40px;margin:auto;display:flex;gap:48px;align-items:center}.logo{display:flex;gap:11px;align-items:center;font-size:18px;font-weight:700;white-space:nowrap;letter-spacing:-.5px}.mark{display:grid;place-items:center;width:34px;height:34px;background:#245bdb;color:white;border-radius:9px;font-size:14px;letter-spacing:-.5px}.main-nav{display:flex;align-self:stretch;gap:30px;white-space:nowrap}.main-nav a{display:flex;align-items:center;font-size:14px;color:var(--muted);border-bottom:2px solid transparent}.main-nav a.active,.main-nav a:hover{color:var(--blue);border-bottom-color:var(--blue)}.header-tools{display:flex;gap:18px;align-items:center;margin-left:auto}.lang-switcher{display:flex;gap:2px}.lang-btn{font-size:12px;font-weight:600;border:0;border-radius:5px;padding:6px;background:transparent;color:var(--muted);min-height:34px}.lang-btn.active{background:var(--soft);color:var(--blue)}.theme-button{border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--text);width:34px;height:34px;font-size:20px;line-height:1}.github{font-size:13px;color:var(--muted);white-space:nowrap}.wrap{max-width:1280px;margin:auto;padding:0 40px}.hero{padding:52px 0 32px;border-bottom:1px solid var(--line)}.eyebrow{font-size:12px;letter-spacing:1.7px;font-weight:650;color:var(--blue);display:flex;align-items:center;gap:8px}.eyebrow>span{width:6px;height:6px;background:var(--blue);border-radius:50%}h1{font-size:clamp(28px,3.2vw,42px);line-height:1.3;letter-spacing:-1.5px;margin:14px 0 10px;font-weight:700}.hero>p{color:var(--muted);margin:0;font-size:16px}.searchbar{display:flex;align-items:center;gap:14px;margin-top:26px;max-width:760px;border:1px solid var(--line);border-radius:10px;padding:0 16px;background:var(--surface);height:58px;transition:border-color .15s,box-shadow .15s}.searchbar:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px var(--soft);background:var(--bg)}.searchbar svg{width:22px;height:22px;color:var(--muted);flex-shrink:0}.searchbar input{width:100%;min-width:0;border:0;outline:none;background:transparent;color:var(--text);font-size:16px;height:100%}.searchbar input:focus-visible{outline:none}.searchbar input::-webkit-search-cancel-button{display:none}.searchbar input::placeholder{color:var(--muted)}kbd{background:var(--bg);border:1px solid var(--line);border-radius:4px;font-size:13px;padding:0 8px;color:var(--muted)}#clearSearch,#resumeClose{border:0;background:transparent;color:var(--muted);font-size:24px;min-width:36px;min-height:36px}.hot{display:flex;flex-wrap:wrap;align-items:center;gap:6px 16px;margin-top:12px;font-size:13px;color:var(--muted)}.hot button{padding:4px 0;background:transparent;border:0;color:var(--muted);font-size:13px}.hot button:hover{color:var(--blue)}.hero .search-status{font-size:13px;margin-top:8px}.search-status:empty{display:none}.resume{display:flex;align-items:center;gap:12px;padding:14px 18px;background:var(--soft);border-radius:8px;margin-top:24px;font-size:14px}.resume-dot{width:7px;height:7px;border-radius:50%;background:var(--blue);flex-shrink:0}.resume a{flex:1;min-width:0}.resume a>span{color:var(--blue);margin-right:14px}.resume strong{font-weight:500;overflow-wrap:anywhere}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin:38px 0 22px}.section-heading h2{font-size:23px;letter-spacing:-.6px;margin:0;font-weight:650}.section-heading p{font-size:14px;color:var(--muted);margin:3px 0 0}.section-heading>span{color:var(--muted);font-size:13px;white-space:nowrap}.section-heading .section-number{font-size:24px;color:var(--line);font-weight:600}.catalog-layout{display:grid;grid-template-columns:184px minmax(0,1fr);gap:32px}.catalog-sidebar{align-self:start;position:sticky;top:105px}.tabs{display:flex;flex-direction:column;gap:4px}.tabs button{display:flex;align-items:center;justify-content:space-between;gap:10px;text-align:left;border:0;background:transparent;padding:11px 12px;color:var(--muted);border-radius:7px;font-size:14px}.tabs button .n{font-size:12px;font-variant-numeric:tabular-nums;opacity:.8}.tabs button:hover{background:var(--surface);color:var(--text)}.tabs button.on{background:var(--soft);color:var(--blue);font-weight:600}.quick-panel{border-top:1px solid var(--line);margin:24px 12px 0;padding-top:18px}.quick-panel h3{font-size:12px;letter-spacing:.5px;color:var(--muted);font-weight:500;margin:0 0 10px}#quickref{display:grid;gap:9px}#quickref a{font-size:13px;color:var(--muted);line-height:1.6}#quickref a:hover{color:var(--blue)}.filter-count{margin:0 0 12px;color:var(--muted);font-size:13px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.topic{border:1px solid var(--line);border-radius:10px;padding:23px 24px 0;display:flex;flex-direction:column;min-width:0;transition:border-color .15s,box-shadow .15s;background:var(--bg)}.topic:hover{border-color:color-mix(in srgb,var(--blue) 45%,var(--line));box-shadow:0 4px 18px #14253b06}.topic-head{display:flex;align-items:center;gap:10px;margin-bottom:14px}.topic-icon{display:grid;place-items:center;background:var(--surface);color:var(--blue);border:1px solid var(--line);border-radius:7px;width:34px;height:34px;font-size:13px;font-weight:700;flex-shrink:0}.topic-tag{font-size:12px;color:var(--muted)}.topic-head>a{color:var(--muted);margin-left:auto}.topic h3{font-size:17px;line-height:1.55;margin:0 0 8px;font-weight:650;letter-spacing:-.2px}.topic h3 a:hover{color:var(--blue)}.topic p{font-size:14px;line-height:1.85;color:var(--muted);margin:0 0 20px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.topic-bottom{margin-top:auto;border-top:1px solid var(--line);padding:13px 0;display:flex;justify-content:space-between;align-items:flex-start;gap:12px;font-size:13px}.topic-bottom>a{white-space:nowrap;color:var(--blue);padding:2px 0}.topic details{min-width:0;flex:1}summary{cursor:pointer;font-size:13px;color:var(--muted);padding:2px 0;list-style:none}summary::-webkit-details-marker{display:none}summary::after{content:'＋';padding-left:8px;font-size:12px}details[open]>summary::after{content:'−'}summary:hover{color:var(--blue)}.chapter-links{display:grid;gap:8px;margin-top:12px}.chapter-links a{font-size:13px;line-height:1.6;color:var(--muted);overflow-wrap:anywhere}.chapter-links a:hover{color:var(--blue)}#learning,#resources{border-top:1px solid var(--line);margin-top:48px}.paths{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.path{padding:22px 24px;background:var(--surface);border:1px solid var(--line);border-radius:10px}.path summary{display:flex;align-items:center;gap:12px;color:var(--text);font-size:16px;font-weight:600}.path summary::after{margin-left:auto}.path-number{color:var(--blue);font-size:12px;font-variant-numeric:tabular-nums}.path>p{margin:8px 0 0 28px;font-size:14px;color:var(--muted)}.path ol{padding:16px 0 0;margin:16px 0 0;list-style:none;border-top:1px solid var(--line);display:grid;gap:14px}.path li a{display:flex;gap:12px;font-size:14px}.path li a:hover{color:var(--blue)}.path li .n{color:var(--blue);font-size:12px;padding-top:3px}.path li small{display:block;font-size:13px;color:var(--muted)}.learn-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 28px}.learn{padding:20px 0;border-top:1px solid var(--line);min-width:0}.learn-tag{font-size:12px;color:var(--muted)}.learn h3{font-size:16px;margin:8px 0;font-weight:600}.learn h3 a:hover{color:var(--blue)}.learn p{font-size:14px;color:var(--muted);margin:0;line-height:1.8}.learn .quick{display:flex;flex-wrap:wrap;gap:8px 14px;margin-top:12px;font-size:13px;color:var(--blue)}.footer{border-top:1px solid var(--line);margin-top:56px;padding:28px 0 36px;display:flex;gap:24px;justify-content:space-between;font-size:12px;color:var(--muted)}.footer strong{font-size:14px;color:var(--text);font-weight:600}.footer a{display:block;margin-top:5px}.results{padding-top:26px;max-width:940px}.result-heading{display:flex;align-items:center;justify-content:space-between;margin:0 0 18px;gap:16px}.result-heading h2{font-size:19px;margin:0}.text-button{background:transparent;border:0;font-size:14px;color:var(--blue);padding:6px 0}.res{display:block;border:1px solid var(--line);padding:18px 22px;border-radius:9px;margin-bottom:12px}.res:hover,.res.sel{border-color:var(--blue);background:var(--soft)}.res small{font-size:12px;color:var(--muted)}.res h3{font-size:16px;margin:4px 0;font-weight:600}.res p{font-size:14px;color:var(--muted);margin:8px 0 0}.res mark{background:var(--soft);color:var(--blue);font-weight:650}.res-empty{padding:48px 24px;background:var(--surface);border:1px solid var(--line);border-radius:10px;text-align:center}.res-empty p{color:var(--muted);font-size:14px}
@media(min-width:1440px){.hero{padding-top:60px}}
@media(max-width:1100px){.header-inner{gap:28px;padding:0 28px}.header-tools{gap:10px}.main-nav{gap:18px}.github{display:none}.wrap{padding:0 28px}.catalog-layout{grid-template-columns:160px minmax(0,1fr);gap:24px}.topic{padding:20px 20px 0}.learn-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:800px){.header-inner{flex-wrap:wrap;gap:0 16px;padding:14px 24px 0}.header-tools{margin-left:auto}.main-nav{order:3;width:100%;gap:28px;margin-top:10px;height:42px}.main-nav a{font-size:14px}.wrap{padding:0 24px}.hero{padding-top:32px}.catalog-layout{display:block}.catalog-sidebar{position:static}.tabs{flex-direction:row;flex-wrap:wrap;gap:6px;margin-bottom:18px}.tabs button{padding:8px 12px;background:var(--surface)}.quick-panel{display:none}.section-heading{margin-top:28px}.section-heading>span{white-space:normal;text-align:right}.filter-count{margin-bottom:14px}html{scroll-padding-top:132px}.footer{margin-top:36px}.paths{gap:12px}}
@media(max-width:540px){.header-inner{padding:12px 18px 0}.logo{font-size:15px;gap:8px}.mark{width:29px;height:29px;font-size:12px}.header-tools{gap:8px}.lang-btn{padding:5px;font-size:12px}.theme-button{width:30px;height:32px}.main-nav{gap:24px}.wrap{padding:0 18px}h1{letter-spacing:-1px;font-size:29px}.hero>p{font-size:14px;max-width:30em}.searchbar{height:54px;margin-top:22px;padding:0 12px;gap:10px}.searchbar kbd{display:none}.hot{gap:4px 14px}.grid,.paths,.learn-grid{grid-template-columns:1fr}.topic{padding:20px 20px 0}.topic h3{font-size:17px}.section-heading{gap:14px}.section-heading h2{font-size:21px}.section-heading p{font-size:13px}.section-heading>span{font-size:12px;max-width:100px}.tabs button{font-size:13px;min-height:40px}.tabs button .n{font-size:12px}.resume a>span{display:block}.resume strong{font-size:13px}.footer{flex-direction:column;gap:16px}.footer a{display:inline;margin-left:12px}.learn{padding:18px 0}.result-heading{align-items:flex-start}.result-heading h2{font-size:17px}.res{padding:16px}.res p{overflow-wrap:anywhere}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}

/* Editorial direction: quiet canvas, confident typography, purposeful entry points. */
:root{--bg:#f7f8fa;--surface:#eef1f5;--paper:#fff;--text:#182335;--muted:#667287;--line:#e0e5ed;--blue:#315de6;--soft:#edf1ff;--shadow:0 8px 28px -16px #162d5b30}
html.dark{--bg:#10151e;--surface:#1d2635;--paper:#161e2b;--text:#e9edf6;--muted:#a5b1c5;--line:#2c3748;--blue:#9bb4ff;--soft:#253455;--shadow:0 10px 30px -15px #0008}
.topbar{background:color-mix(in srgb,var(--paper) 94%,transparent);backdrop-filter:blur(16px);border-bottom-color:var(--line)}
.header-inner{min-height:72px;max-width:1360px;gap:44px}.wrap{max-width:1360px}.logo{font-size:17px;letter-spacing:-.3px}.mark{width:36px;height:36px;border-radius:11px;background:#2449c9;box-shadow:inset 0 1px 0 #ffffff38,0 3px 8px #2449c920}
.main-nav{gap:28px}.main-nav a{position:relative;border:0;font-weight:500}.main-nav a::after{content:'';position:absolute;bottom:14px;left:50%;width:4px;height:4px;border-radius:50%;background:var(--blue);opacity:0;transition:opacity .15s}.main-nav a.active::after{opacity:1}.main-nav a:hover{border:0}
.header-tools{gap:14px}.lang-switcher{padding:3px;background:var(--surface);border-radius:8px}.lang-btn{min-height:28px;padding:3px 7px}.lang-btn.active{background:var(--paper);box-shadow:0 1px 4px #15284812}.theme-button{width:36px;height:36px;border-radius:9px;background:var(--paper)}
.hero{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:72px;align-items:center;padding:64px 0 54px;border:0}.hero-copy{min-width:0}.eyebrow{font-size:10px;letter-spacing:2.3px;color:var(--muted)}.eyebrow>span{width:5px;height:5px}h1{font-size:clamp(38px,4.2vw,60px);font-weight:720;line-height:1.22;letter-spacing:-2.1px;margin:24px 0 22px}h1 em{font-style:normal;color:var(--blue)}.hero-copy>p{font-size:15px;line-height:1.95;color:var(--muted);margin:0}.searchbar{background:var(--paper);height:62px;border-radius:13px;border-color:var(--line);box-shadow:var(--shadow);margin-top:28px;gap:13px;padding:0 18px}.searchbar:focus-within{box-shadow:0 0 0 4px var(--soft),var(--shadow);background:var(--paper)}.searchbar input{font-size:15px}.searchbar kbd{background:var(--surface);font-size:12px;padding:2px 8px}.hot{font-size:12px;gap:7px 9px;margin-top:15px}.hot>span{margin-right:4px}.hot button{padding:3px 9px;border:1px solid transparent;border-radius:5px;font-size:12px;background:var(--surface)}.hot button:hover{border-color:var(--line);background:var(--paper)}
.start-panel{align-self:stretch;margin:8px 0 0;display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden}.start-heading{position:relative;padding:28px 26px 23px;border-bottom:1px solid var(--line);background:var(--text);color:var(--paper)}.start-heading p{font-size:11px;letter-spacing:.5px;margin:0 0 9px;opacity:.6}.start-heading h2{font-size:20px;letter-spacing:-.5px;line-height:1.5;margin:0;font-weight:600}.start-symbol{position:absolute;right:24px;top:22px;opacity:.35;font-size:26px}.start-links{padding:0 24px}.start-links a{display:flex;gap:15px;align-items:center;padding:20px 0;border-bottom:1px solid var(--line)}.start-links a:last-child{border:0}.start-number{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}.start-links strong{display:block;font-size:14px;font-weight:600}.start-links small{display:block;font-size:12px;color:var(--muted);margin-top:3px}.start-arrow{margin-left:auto;color:var(--muted);transition:transform .18s,color .18s}.start-links a:hover strong,.start-links a:hover .start-arrow{color:var(--blue)}.start-links a:hover .start-arrow{transform:translateX(3px)}.start-all{margin-top:auto;border-top:1px solid var(--line);padding:14px 25px;font-size:12px;color:var(--muted);display:flex;justify-content:space-between;background:var(--surface)}.start-all:hover{color:var(--blue)}
.catalog-section{border-top:1px solid var(--line)}.section-heading{margin:34px 0 26px}.section-heading h2{font-size:24px;font-weight:650;letter-spacing:-.7px}.section-heading p{font-size:13px;margin-top:5px}.catalog-count{font-size:11px!important;letter-spacing:.2px;padding:6px 10px;border:1px solid var(--line);border-radius:6px;background:var(--paper)}.catalog-layout{grid-template-columns:190px minmax(0,1fr);gap:32px}.catalog-sidebar{top:96px}.tabs{gap:5px}.tabs button{min-height:46px;padding:11px 13px;font-size:13px;border:1px solid transparent;transition:background .15s,color .15s}.tabs button.on{background:var(--paper);color:var(--blue);box-shadow:0 2px 7px #13214406;border-color:var(--line)}.tabs button .n{background:var(--surface);padding:0 6px;min-width:23px;border-radius:4px;font-size:11px;text-align:center}.tabs button.on .n{background:var(--soft);opacity:1}.quick-panel{margin:28px 12px 0;padding-top:20px}.quick-panel h3{font-size:11px}#quickref{gap:11px}#quickref a{font-size:12px}.filter-count{font-size:12px;margin-bottom:15px}.grid{gap:18px;align-items:start}.topic{padding:24px 24px 0;background:var(--paper);border-radius:13px;box-shadow:0 2px 3px #17253b02;transition:border-color .18s,box-shadow .18s,transform .18s}.topic:hover{border-color:color-mix(in srgb,var(--blue) 32%,var(--line));box-shadow:var(--shadow);transform:translateY(-2px)}.topic-head{margin-bottom:18px;gap:12px}.topic-icon{width:40px;height:40px;background:var(--icon-bg,var(--soft));color:var(--icon-ink,var(--blue));border:0;border-radius:11px}.topic-icon svg{width:21px;height:21px}.topic-tag{font-size:11px;letter-spacing:.15px}.topic-head>a{width:27px;height:27px;display:grid;place-items:center;border-radius:50%;opacity:.65}.topic-head>a:hover{background:var(--soft);color:var(--blue);opacity:1}.topic h3{font-size:18px;font-weight:650;margin:0 0 10px;letter-spacing:-.4px}.topic p{font-size:13px;line-height:1.9;min-height:3.8em;margin-bottom:22px}.topic-bottom{position:relative;display:block;padding:0;margin:0;border-top:1px solid var(--line)}.topic-bottom>details>summary{min-height:49px;padding:15px 112px 15px 0;font-size:11px;line-height:1.8}.topic-bottom>a{position:absolute;right:0;top:13px;font-size:12px;font-weight:500}.chapter-links{margin:0 -10px 15px;padding:6px 8px 8px;border-top:1px solid var(--line);max-height:300px;overflow:auto;overscroll-behavior:contain;gap:2px;scrollbar-width:thin}.chapter-links a{font-size:12px;padding:8px;border-radius:5px}.chapter-links a:hover,.chapter-links a:focus-visible{background:var(--soft)}.chapter-links a:focus-visible{outline-offset:-2px}
#learning,#resources{margin-top:56px}.paths{gap:16px;align-items:start}.path{background:var(--paper);padding:23px 26px;border-radius:13px;transition:border-color .18s}.path:hover{border-color:color-mix(in srgb,var(--blue) 30%,var(--line))}.path summary{font-size:15px;line-height:1.6;font-weight:600}.path-number{width:29px;height:29px;display:grid;place-items:center;background:var(--soft);border-radius:8px;font-size:11px}.path>p{font-size:13px;margin-left:41px;line-height:1.9}.path ol{gap:0}.path li a{padding:11px 0;font-size:13px}.path li small{font-size:12px;margin-top:3px}.learn-grid{gap:16px;grid-template-columns:repeat(3,minmax(0,1fr))}.learn{padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:12px}.learn-tag{font-size:10px;color:var(--blue)}.learn h3{font-size:15px;margin:10px 0}.learn p{font-size:12px}.learn .quick{font-size:11px;gap:8px 12px}.footer{margin-top:64px;padding:34px 0 38px}.footer strong{font-size:15px}.footer-note{display:block;font-size:9px;letter-spacing:1.4px;margin-top:5px}.footer span>br{display:none}.footer>span{font-size:11px}.footer>span:last-child{text-align:right}.resume{margin:0 0 28px;border:1px solid color-mix(in srgb,var(--blue) 15%,var(--line));border-radius:12px;font-size:13px}.results{max-width:none;padding:0 0 20px}.res{background:var(--paper);padding:23px 26px;border-radius:12px;margin-bottom:10px}.res h3{font-size:17px}.res p{line-height:1.85;font-size:13px}.result-heading{padding:24px 0 5px;border-top:1px solid var(--line)}.result-heading small{font-size:12px;color:var(--muted);font-weight:400}.text-button{font-size:12px}.res-empty{background:var(--paper);padding:60px 24px}.to-top{position:fixed;bottom:24px;right:24px;z-index:90;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:var(--paper);color:var(--muted);box-shadow:var(--shadow);cursor:pointer;font-size:19px}.to-top:hover{color:var(--blue);border-color:var(--blue)}
html.dark .start-heading{background:#263753;color:#edf2ff}html.dark .topic-icon{background:var(--soft);color:var(--blue)}
@media(min-width:1600px){.hero{gap:110px;padding-top:76px;padding-bottom:64px}}
@media(max-width:1100px){.hero{grid-template-columns:minmax(0,1fr) 300px;gap:36px;padding:48px 0}.header-inner{gap:28px}.catalog-layout{grid-template-columns:165px minmax(0,1fr);gap:24px}.topic{padding:20px 20px 0}.topic-bottom>details>summary{padding-right:95px}.topic-bottom>a{font-size:11px}.learn-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:800px){.header-inner{min-height:0;gap:0 16px}.main-nav a::after{bottom:5px}.hero{gap:24px;grid-template-columns:minmax(0,1fr) 270px;padding:36px 0}.hero h1{font-size:38px;letter-spacing:-1.5px}.hero-copy>p{font-size:13px}.hero-copy>p br{display:none}.searchbar{height:56px}.searchbar input{font-size:13px}.searchbar kbd{display:none}.start-heading{padding:22px}.start-heading h2{font-size:18px}.start-links{padding:0 20px}.start-links a{padding:17px 0;gap:10px}.start-links strong{font-size:13px}.start-links small{font-size:11px}.catalog-layout{display:block}.tabs{gap:7px}.tabs button{padding:8px 12px;min-height:40px}.catalog-sidebar{position:static}.catalog-count{max-width:none!important}.grid{gap:14px}.section-heading{margin:28px 0 22px}.topic h3{font-size:17px}}
@media(max-width:600px){.hero{grid-template-columns:1fr;gap:28px;padding:34px 0 30px}.hero h1{font-size:42px;line-height:1.25;margin:20px 0 17px}.hero-copy>p{font-size:14px}.eyebrow{font-size:9px;letter-spacing:2px}.start-panel{margin:0;border-radius:13px;box-shadow:none}.start-heading{padding:18px 20px}.start-heading p{margin-bottom:4px;font-size:10px}.start-heading h2{font-size:17px}.start-symbol{font-size:23px;top:17px;right:20px}.start-links a{padding:14px 0}.start-links small{display:none}.start-links strong{font-size:13px}.start-number{font-size:10px}.start-links{padding:0 20px}.start-all{padding:11px 20px;font-size:11px}.catalog-count{font-size:10px!important;max-width:150px!important}.section-heading h2{font-size:22px}.section-heading p{font-size:12px}.section-heading{gap:12px}.catalog-layout .tabs{flex-wrap:nowrap;overflow:auto;padding:3px 0 10px;margin:0 -2px 8px;scrollbar-width:thin}.tabs button{flex-shrink:0;white-space:nowrap;font-size:12px}.grid,.paths,.learn-grid{grid-template-columns:1fr}.topic{padding:22px 22px 0}.topic h3{font-size:18px}.topic-head{margin-bottom:16px}.topic p{min-height:0;margin-bottom:20px}.topic-bottom>details>summary{font-size:12px}.topic-bottom>a{font-size:12px}.path{padding:20px}.path summary{font-size:14px}.learn{padding:20px}.learn p{font-size:13px}.footer>span:last-child{text-align:left}.footer{margin-top:40px;gap:20px}.to-top{right:16px;bottom:16px;width:38px;height:38px}.header-tools{gap:7px}.lang-switcher{padding:2px}.lang-btn{padding:3px 5px}.theme-button{width:30px;height:32px}.main-nav{height:42px;margin-top:6px}.hero-copy .search-status{font-size:12px}.res{padding:20px}.topic:hover{transform:none}}
@media(prefers-reduced-motion:reduce){.topic:hover,.start-links a:hover .start-arrow{transform:none}}
/* Search stays task-focused while preserving the input position. */
.is-searching .start-panel{visibility:hidden}.is-searching .hero{padding-bottom:30px}.topic details[open] summary{color:var(--blue)}
@media(max-width:600px){.is-searching .start-panel{display:none}.is-searching .hero{gap:0}}

/* Chapter lists mirror the reading guide's groups and retain scan-friendly numbering. */
.chapter-links .chapter-group{font-size:11px;color:var(--text);padding:14px 8px 5px;font-weight:650}
.chapter-links .chapter-group:first-child{padding-top:7px}
.chapter-links a{display:flex;gap:10px;align-items:baseline}
.chapter-number{color:var(--muted);font-size:10px;min-width:18px;font-variant-numeric:tabular-nums;flex:none}
.chapter-links a>span:last-child{min-width:0}