:root{color:#182033;font-synthesis:none;text-rendering:optimizelegibility;--primary:#1f4d7a;--primary-strong:#153b60;--text:#182033;--muted:#64748b;--surface:#fff;--background:#f5f7fb;--border:#dbe3ee;--soft:#edf3f8;background:#f5f7fb;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--background);min-width:320px;min-height:100vh;color:var(--text);margin:0}a{color:inherit}button,input,select{font:inherit}button,select{cursor:pointer}.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}.site-header{z-index:20;border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffff7;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:24px;width:min(1240px,100% - 40px);min-height:68px;margin:0 auto;display:flex}.brand-link{align-items:baseline;gap:10px;text-decoration:none;display:flex}.brand-link strong{color:var(--primary-strong);font-size:1.05rem}.brand-link span{color:var(--muted);font-size:.92rem}.header-actions{align-items:center;gap:10px;display:flex}.profile-select-label{color:var(--muted);font-size:.82rem;font-weight:700}.profile-select{border:1px solid var(--border);background:var(--surface);min-width:190px;color:var(--text);border-radius:10px;padding:9px 12px}.page-shell{width:min(1240px,100% - 40px);margin:0 auto}.hero{border-bottom:1px solid var(--border);background:linear-gradient(#fff 0%,#eef4f9 100%)}.hero-inner{text-align:center;padding:88px 0 78px}.eyebrow{color:var(--primary);letter-spacing:.09em;text-transform:uppercase;margin:0 0 12px;font-size:.78rem;font-weight:850}h1,h2,h3{color:var(--text);letter-spacing:-.025em}h1{margin:0;font-size:clamp(2.35rem,6vw,4.5rem);line-height:1.03}h2{font-size:clamp(1.45rem,3vw,2rem)}.lead{max-width:740px;color:var(--muted);margin:20px auto 0;font-size:1.12rem;line-height:1.65}.hero-search{background:var(--surface);border:1px solid var(--border);border-radius:15px;grid-template-columns:1fr auto;gap:8px;max-width:720px;margin:34px auto 0;padding:7px;display:grid;box-shadow:0 12px 36px #1c324b14}.hero-search input{min-width:0;color:var(--text);background:0 0;border:0;outline:0;padding:12px 14px}.hero-search button,.button-link{background:var(--primary);color:#fff;border:0;border-radius:10px;font-weight:750;text-decoration:none}.hero-search button{padding:11px 20px}.button-link{margin-top:12px;padding:11px 16px;display:inline-flex}.hero-search button:hover,.button-link:hover{background:var(--primary-strong)}.home-section{padding:64px 0 82px}.section-heading{max-width:720px}.section-heading h2{margin:0}.profile-grid,.article-grid{gap:18px;margin-top:28px;display:grid}.profile-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.article-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.profile-card,.article-card{background:var(--surface);border:1px solid var(--border);border-radius:17px;flex-direction:column;gap:12px;min-height:190px;padding:24px;text-decoration:none;transition:transform .16s,border-color .16s,box-shadow .16s;display:flex}.profile-card:hover,.article-card:hover{border-color:#aec4d8;transform:translateY(-2px);box-shadow:0 14px 34px #1c324b14}.profile-card strong,.article-card strong{font-size:1.18rem}.profile-card>span:not(.card-link),.article-card>span:not(.card-link){color:var(--muted);line-height:1.55}.profile-card-kicker,.article-card-type{letter-spacing:.07em;text-transform:uppercase;font-size:.73rem;font-weight:850;color:var(--primary)!important}.card-link{color:var(--primary);margin-top:auto;font-weight:780}.help-layout{grid-template-columns:260px minmax(0,1fr);align-items:start;gap:44px;padding:38px 0 76px;display:grid}.desktop-sidebar{max-height:calc(100vh - 116px);position:sticky;top:94px;overflow:auto}.mobile-sidebar{display:none}.help-sidebar{padding-right:8px}.sidebar-home{color:var(--primary-strong);border-radius:9px;margin-bottom:20px;padding:10px 12px;font-weight:780;text-decoration:none;display:block}.sidebar-section{margin:24px 0}.sidebar-section h2{color:var(--muted);letter-spacing:.07em;text-transform:uppercase;margin:0 0 8px 12px;font-size:.73rem}.sidebar-section ul{margin:0;padding:0;list-style:none}.sidebar-section a{color:#42526a;border-radius:9px;padding:8px 12px;font-size:.92rem;line-height:1.35;text-decoration:none;display:block}.sidebar-section a:hover,.sidebar-section a.active,.sidebar-home.active{background:var(--soft);color:var(--primary-strong)}.help-main{min-width:0;max-width:900px}.breadcrumbs{color:var(--muted);flex-wrap:wrap;align-items:center;gap:7px;margin-bottom:34px;font-size:.83rem;display:flex}.breadcrumbs a{color:var(--primary);text-decoration:none}.profile-hero{border-bottom:1px solid var(--border);padding:10px 0 28px}.profile-hero h1{font-size:clamp(2.2rem,5vw,3.7rem)}.profile-hero .lead{margin-left:0}.category-block{padding:32px 0 12px}.category-block h2{margin:0}.article-header{border-bottom:1px solid var(--border);padding-bottom:20px}.article-meta{flex-wrap:wrap;gap:8px;display:flex}.article-meta span{background:var(--soft);color:var(--primary-strong);border-radius:999px;padding:5px 9px;font-size:.74rem;font-weight:760}.article-description{max-width:760px;color:var(--muted);margin:14px 0 0;font-size:1rem;line-height:1.65}.article-body{max-width:760px;padding:30px 0 24px;font-size:1.02rem;line-height:1.75}.article-body h1{margin:0 0 22px;font-size:clamp(2rem,4vw,3.15rem)}.article-body h2{margin-top:38px}.article-body p{margin:0 0 18px}.article-body ul,.article-body ol{padding-left:24px}.article-footer{border-top:1px solid var(--border);max-width:760px;color:var(--muted);padding:20px 0;font-size:.83rem}.empty-state{padding-top:76px;padding-bottom:76px}.empty-state h1{max-width:760px;font-size:clamp(2rem,5vw,3.5rem)}.empty-state p{max-width:620px;color:var(--muted);line-height:1.6}:focus-visible{outline-offset:3px;outline:3px solid #0f67a8}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important}}@media (width<=900px){.profile-grid{grid-template-columns:1fr}.help-layout{padding-top:24px;display:block}.desktop-sidebar{display:none}.mobile-sidebar{border:1px solid var(--border);background:var(--surface);border-radius:12px;margin-bottom:26px;display:block}.mobile-sidebar>summary{color:var(--primary-strong);padding:13px 15px;font-weight:780}.mobile-sidebar .help-sidebar{border-top:1px solid var(--border);padding:6px 12px 16px}}@media (width<=680px){.header-inner,.page-shell{width:min(100% - 28px,1240px)}.header-inner{gap:12px;min-height:62px}.brand-link{gap:0;display:grid}.brand-link span{font-size:.72rem}.profile-select-label{display:none}.profile-select{min-width:132px;max-width:145px;font-size:.82rem}.hero-inner{text-align:left;padding:62px 0 56px}.lead{margin-left:0}.hero-search{grid-template-columns:1fr;margin-left:0}.hero-search button{width:100%}.home-section{padding:46px 0 60px}.article-grid{grid-template-columns:1fr}.breadcrumbs{margin-bottom:24px}.help-layout{padding-bottom:54px}}.search-form{background:var(--surface);border:1px solid var(--border);border-radius:15px;grid-template-columns:1fr auto;gap:8px;max-width:720px;margin:34px auto 0;padding:7px;display:grid;box-shadow:0 12px 36px #1c324b14}.search-form input{min-width:0;color:var(--text);background:0 0;border:0;outline:0;padding:12px 14px}.search-form button{background:var(--primary);color:#fff;border:0;border-radius:10px;padding:11px 20px;font-weight:750}.search-form button:hover{background:var(--primary-strong)}.compact-search{width:min(360px,34vw);box-shadow:none;border-radius:11px;margin:0;padding:4px}.compact-search input{padding:8px 10px;font-size:.9rem}.compact-search button{padding:8px 12px;font-size:.84rem}.profile-control{align-items:center;gap:10px;display:flex}.search-page{padding-top:56px;padding-bottom:76px}.search-page-heading{max-width:800px}.search-page-heading h1{font-size:clamp(2.1rem,5vw,3.7rem)}.search-page-heading .lead,.search-page-heading .search-form{margin-left:0}.result-count{color:var(--muted);margin:36px 0 14px;font-size:.9rem;font-weight:750}.search-results{gap:14px;max-width:900px;display:grid}.search-result-card{background:var(--surface);border:1px solid var(--border);border-radius:15px;padding:22px 24px;text-decoration:none;transition:transform .16s,border-color .16s,box-shadow .16s;display:block}.search-result-card:hover{border-color:#aec4d8;transform:translateY(-2px);box-shadow:0 12px 30px #1c324b12}.search-result-card h2{margin:9px 0 8px;font-size:1.3rem}.search-result-card p{max-width:760px;color:var(--muted);margin:0 0 14px;line-height:1.6}.search-result-meta{flex-wrap:wrap;gap:7px;display:flex}.search-result-meta span{background:var(--soft);color:var(--primary-strong);border-radius:999px;padding:4px 8px;font-size:.72rem;font-weight:760}.compact-empty{padding-top:38px;padding-bottom:38px}.compact-empty h2{margin-bottom:8px}@media (width<=900px){.compact-search{display:none}}@media (width<=680px){.search-form{grid-template-columns:1fr;margin-left:0}.search-form button{width:100%}.search-page{padding-top:38px}.search-result-card{padding:18px}.profile-control{gap:0}}.header-link{color:var(--primary-strong);font-size:.88rem;font-weight:760;text-decoration:none}.header-link:hover{text-decoration:underline}.article-with-toc{grid-template-columns:minmax(0,760px) minmax(180px,220px);align-items:start;gap:44px;display:grid}.article-column,.article-toc-column{min-width:0}.table-of-contents{border-left:1px solid var(--border);padding-left:18px;position:sticky;top:94px}.table-of-contents>strong{color:var(--text);margin-bottom:10px;font-size:.82rem;display:block}.table-of-contents ul{margin:0;padding:0;list-style:none}.table-of-contents li{margin:7px 0}.table-of-contents .toc-level-3{padding-left:12px}.table-of-contents a{color:var(--muted);font-size:.82rem;line-height:1.4;text-decoration:none}.table-of-contents a:hover{color:var(--primary)}.callout{border:1px solid var(--border);background:var(--surface);border-left-width:4px;border-radius:12px;margin:28px 0;padding:18px 20px}.callout-label{color:var(--primary-strong);margin-bottom:8px;font-size:.82rem;display:block}.callout-content>:first-child{margin-top:0}.callout-content>:last-child{margin-bottom:0}.callout-info{border-left-color:var(--primary)}.callout-tip{border-left-color:#31805a}.callout-warning{border-left-color:#ba7b16}.callout-important{border-left-color:#9f3f4f}.callout-concept{border-left-color:#7058a8}.help-steps{counter-reset:help-step;margin:30px 0;padding:0;list-style:none}.help-step{counter-increment:help-step;min-height:54px;padding:0 0 24px 54px;position:relative}.help-step:before{content:counter(help-step);background:var(--primary);color:#fff;border-radius:50%;place-items:center;width:34px;height:34px;font-size:.84rem;font-weight:800;display:grid;position:absolute;top:0;left:0}.help-step:not(:last-child):after{content:"";background:var(--border);width:2px;position:absolute;top:36px;bottom:2px;left:16px}.help-step-title{margin-bottom:5px;display:block}.help-step-body>div>:first-child{margin-top:0}.help-image{margin:30px 0}.help-image-trigger{border:1px solid var(--border);background:var(--surface);border-radius:14px;width:100%;padding:0;overflow:hidden}.help-image-trigger img{width:100%;height:auto;display:block}.help-image figcaption{color:var(--muted);margin-top:9px;font-size:.82rem}.screenshot-pending{border:1px dashed var(--border);color:var(--muted);background:var(--surface);border-radius:12px;margin:24px 0;padding:18px}.image-lightbox{z-index:100;background:#09111de0;place-items:center;padding:56px 24px 24px;display:grid;position:fixed;inset:0}.image-lightbox img{object-fit:contain;border-radius:10px;max-width:min(1400px,96vw);max-height:88vh}.lightbox-close{color:#fff;background:#0006;border:1px solid #ffffff59;border-radius:50%;width:40px;height:40px;font-size:1.55rem;position:fixed;top:16px;right:20px}.help-diagram{border:1px solid var(--border);background:linear-gradient(180deg, var(--surface), #f0f6fbb8);border-radius:16px;margin:34px 0;padding:22px;overflow:hidden}.help-diagram figcaption{color:var(--muted);margin-top:18px;font-size:.82rem;line-height:1.5}.diagram-sequence{flex-wrap:wrap;align-items:stretch;gap:12px 8px;display:flex}.diagram-sequence-group{flex:150px;align-items:center;gap:8px;min-width:0;display:flex}.diagram-node{border:1px solid var(--border);background:var(--surface);border-radius:12px;flex-direction:column;flex:1;justify-content:center;gap:5px;min-height:86px;padding:14px;display:flex;box-shadow:0 6px 18px #1536560d}.diagram-node strong{color:var(--primary-strong);font-size:.9rem}.diagram-node small{color:var(--muted);line-height:1.35}.diagram-arrow{color:var(--primary);flex:none;font-size:1.05rem;font-weight:800}.diagram-comparison{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;display:grid}.diagram-card{border:1px solid var(--border);background:var(--surface);border-radius:14px;min-width:0;padding:18px}.diagram-card>span{color:var(--primary);letter-spacing:.04em;text-transform:uppercase;margin-bottom:5px;font-size:.72rem;font-weight:800;display:block}.diagram-card>strong{color:var(--text);font-size:1.08rem;display:block}.diagram-card p{color:var(--muted);margin:9px 0 0;font-size:.9rem;line-height:1.5}.diagram-hierarchy{max-width:690px;margin:0 auto}.diagram-hierarchy-level{border:1px solid var(--border);background:var(--surface);border-radius:14px;padding:16px}.diagram-hierarchy-level>strong{color:var(--primary-strong);display:block}.diagram-hierarchy-level>span{color:var(--muted);margin:4px 0 14px;font-size:.85rem;display:block}.diagram-hierarchy-level.mentor{background:#f0f6fbc7;margin:0 9%}.diagram-hierarchy-level.student{background:var(--surface);margin:0 11%}.diagram-cycle{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;display:grid}.diagram-cycle-step{border:1px solid var(--border);background:var(--surface);border-radius:14px;min-height:116px;padding:16px;position:relative}.diagram-step-number{background:var(--primary);color:#fff;border-radius:50%;place-items:center;width:28px;height:28px;margin-bottom:12px;font-size:.76rem;font-weight:800;display:grid}.diagram-cycle-step strong{color:var(--primary-strong);display:block}.diagram-cycle-step small{color:var(--muted);margin-top:5px;line-height:1.35;display:block}.diagram-cycle-return{color:var(--primary-strong);text-align:center;background:#17528014;border-radius:999px;margin-top:12px;padding:10px 14px;font-size:.82rem;font-weight:760}.related-articles{margin:36px 0}.related-articles h2{font-size:1.15rem}.related-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.related-card{border:1px solid var(--border);background:var(--surface);border-radius:12px;flex-direction:column;gap:7px;padding:16px;text-decoration:none;display:flex}.related-card span{color:var(--muted);text-transform:capitalize;font-size:.76rem}.related-card:hover{border-color:#aec4d8}.article-navigation{border-top:1px solid var(--border);grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:36px;padding-top:26px;display:grid}.article-nav-card{border:1px solid var(--border);background:var(--surface);border-radius:12px;flex-direction:column;gap:7px;padding:16px;text-decoration:none;display:flex}.article-nav-card span{color:var(--primary);font-size:.78rem;font-weight:760}.article-nav-card.next{text-align:right}.article-nav-card:hover{border-color:#aec4d8}.faq-page{padding-top:64px;padding-bottom:84px}.faq-page-heading{max-width:760px}.faq-page-heading h1{font-size:clamp(2.2rem,5vw,3.7rem)}.faq-page-heading .lead{margin-left:0}.faq-group{max-width:860px;margin-top:42px}.faq-group h2{margin:0;font-size:1.15rem}.faq-group .faq-list{margin-top:12px}.faq-list{max-width:860px;margin-top:36px}.faq-item{border-top:1px solid var(--border);background:0 0}.faq-item:last-child{border-bottom:1px solid var(--border)}.faq-item summary{color:var(--text);cursor:pointer;padding:19px 4px;font-weight:760}.faq-answer{color:var(--muted);padding:0 4px 20px;line-height:1.65}.faq-answer p{margin-top:0}.faq-answer a{color:var(--primary);font-weight:720}@media (width<=1120px){.article-with-toc{grid-template-columns:minmax(0,1fr)}.article-toc-column{order:-1}.table-of-contents{border:1px solid var(--border);background:var(--surface);border-radius:12px;padding:13px 15px;position:static}.table-of-contents ul{columns:2;column-gap:24px}.diagram-cycle{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=760px){.diagram-comparison{grid-template-columns:1fr}.diagram-sequence,.diagram-sequence-group{grid-template-columns:1fr;gap:8px;display:grid}.diagram-arrow{justify-self:center;transform:rotate(90deg)}.diagram-node{min-height:72px}.diagram-hierarchy-level.mentor{margin:0 4%}.diagram-hierarchy-level.student{margin:0 5%}}@media (width<=680px){.header-link{display:none}.table-of-contents ul{columns:1}.related-grid,.article-navigation,.diagram-cycle{grid-template-columns:1fr}.article-nav-card.next{text-align:left}.image-lightbox{padding:64px 12px 18px}.help-diagram{padding:16px}}