/* === Reset === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f5f5f7;--surface:#fff;--surface-hover:#f0f0f3;
  --primary:#6c3fc5;--primary-hover:#5a33a3;--primary-light:#ede8f8;
  --text:#1a1a2e;--text-secondary:#6b6b80;--text-muted:#9898a8;
  --border:#e4e4ec;--radius:10px;--font:'Inter',system-ui,sans-serif;
  --header-h:64px;--sidebar-w:276px;
}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.65;font-size:15px;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}

/* === Header === */
.site-header{position:sticky;top:0;z-index:100;height:var(--header-h);background:rgba(255,255,255,.88);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 28px;gap:20px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:17px;color:var(--text);text-decoration:none;white-space:nowrap;flex-shrink:0}
.logo svg{color:var(--primary)}
.search-wrap{flex:1;max-width:460px;position:relative}
.search-wrap input{width:100%;height:40px;padding:0 16px 0 42px;background:var(--bg);border:1.5px solid var(--border);border-radius:100px;font-size:14px;color:var(--text);font-family:var(--font);outline:none;transition:border-color .2s,box-shadow .2s}
.search-wrap input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(108,63,197,.12);background:#fff}
.search-wrap input::placeholder{color:var(--text-muted)}
.search-icon{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--text-muted);pointer-events:none}
.search-results{position:absolute;top:calc(100% + 7px);left:0;right:0;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 32px rgba(0,0,0,.10);z-index:300;overflow:hidden;display:none}
.search-results.visible{display:block}
.sr-item{display:block;padding:11px 16px;border-bottom:1px solid var(--border);font-size:13.5px;color:var(--text);transition:background .12s;text-decoration:none}
.sr-item:last-child{border-bottom:none}
.sr-item:hover{background:var(--bg)}
.sr-cat{font-size:11px;color:var(--primary);font-weight:600;text-transform:uppercase;letter-spacing:.06em;margin-bottom:2px}
.sr-empty{padding:18px 16px;text-align:center;color:var(--text-muted);font-size:14px}
.header-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.header-nav a{padding:7px 13px;border-radius:100px;font-size:14px;color:var(--text-secondary);font-weight:500;transition:background .15s,color .15s;text-decoration:none}
.header-nav a:hover{background:var(--bg);color:var(--text)}
.btn-cta{background:var(--primary)!important;color:#fff!important;font-weight:600!important}
.btn-cta:hover{background:var(--primary-hover)!important}

/* === Layout === */
.page-wrap{display:grid;grid-template-columns:1fr var(--sidebar-w);max-width:1240px;margin:0 auto;padding:0 28px;width:100%;flex:1}
.page-main{padding:36px 44px 80px 0;min-width:0}
.page-sidebar{padding:28px 0 80px 28px;border-left:1px solid var(--border);position:sticky;top:var(--header-h);max-height:calc(100vh - var(--header-h));overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--border) transparent}
.page-sidebar::-webkit-scrollbar{width:4px}
.page-sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
.site-footer{border-top:1px solid var(--border);text-align:center;padding:24px;font-size:13px;color:var(--text-muted);background:var(--surface)}

/* === Sidebar Nav === */
.sidebar-nav{}
.sidebar-home{display:block;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary);padding:6px 8px;margin-bottom:10px;text-decoration:none;border-radius:6px;transition:color .15s}
.sidebar-home:hover{color:var(--primary)}
.l1{list-style:none;margin-bottom:16px}
.l1-link{display:block;padding:7px 9px;border-radius:var(--radius);font-size:13.5px;font-weight:500;color:var(--text-secondary);transition:background .14s,color .14s;text-decoration:none;margin-bottom:2px}
.l1-link:hover{background:var(--surface-hover);color:var(--text);text-decoration:none}
.l1-link.active{color:var(--primary);font-weight:600;background:var(--primary-light)}
.l2{list-style:none;padding-left:10px;margin:3px 0 6px}
.l2-link{display:block;padding:5px 9px;border-radius:var(--radius);font-size:12.5px;color:var(--text-secondary);transition:background .12s,color .12s;text-decoration:none;margin-bottom:1px}
.l2-link:hover{color:var(--text);background:var(--surface-hover);text-decoration:none}
.l2-link.active{color:var(--primary);font-weight:500}
.l3{list-style:none;padding-left:10px;margin:2px 0 4px}
.l3-link{display:block;padding:4px 9px;border-radius:var(--radius);font-size:12px;color:var(--text-muted);border-left:2px solid transparent;transition:color .12s,border-color .12s,background .12s;text-decoration:none}
.l3-link:hover{color:var(--text-secondary);text-decoration:none}
.l3-link.active{color:var(--primary);font-weight:600;border-left-color:var(--primary);background:var(--primary-light)}
.sidebar-section-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);padding:4px 8px;margin-top:4px}

/* === Page elements === */
.breadcrumb{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--text-muted);margin-bottom:16px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-secondary)}
.breadcrumb a:hover{color:var(--primary)}
.bc-sep{color:var(--border)}
.back-btn{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;color:var(--text-secondary);font-weight:500;padding:6px 14px 6px 10px;border-radius:100px;border:1.5px solid var(--border);background:var(--surface);cursor:pointer;transition:background .14s,border-color .14s,color .14s;text-decoration:none;margin-bottom:24px}
.back-btn:hover{background:var(--bg);border-color:var(--text-secondary);color:var(--text);text-decoration:none}
.article-meta{font-size:12px;color:var(--text-muted);font-weight:500;letter-spacing:.04em;text-transform:uppercase;margin-bottom:8px}
.page-heading{font-size:28px;font-weight:800;letter-spacing:-.4px;color:var(--text);margin-bottom:20px;line-height:1.2}

/* === TOC Block === */
.toc-block{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:18px 22px;margin-bottom:28px}
.toc-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--text-muted);margin-bottom:10px}
.toc-list{list-style:none}
.toc-list li{margin-bottom:4px}
.toc-list li a{font-size:13.5px;font-weight:500;color:var(--primary)}
.toc-list li a:hover{text-decoration:underline}
.toc-list li.toc-l3{padding-left:16px}
.toc-list li.toc-l3 a{font-size:13px;color:var(--text-secondary)}
.toc-list li.toc-l3::before{content:"•";margin-right:6px;color:var(--primary);font-size:11px}

/* === Alert blocks === */
.alert-advice,.alert-important,.alert-note{display:flex;gap:12px;align-items:flex-start;border-radius:var(--radius);padding:14px 16px;margin:18px 0;font-size:14px;line-height:1.65}
.alert-advice{background:#eef7ee;border-left:4px solid #3da64a;color:#1e4d22}
.alert-important{background:#fff5e6;border-left:4px solid #e68a00;color:#6b3a00}
.alert-note{background:#eef2ff;border-left:4px solid #4a6fe2;color:#1a2f6e}
.alert-icon{flex-shrink:0;margin-top:1px}
.alert-advice .alert-icon{stroke:#3da64a}
.alert-important .alert-icon{stroke:#e68a00}
.alert-note .alert-icon{stroke:#4a6fe2}

/* === Table === */
.table-wrapper{overflow-x:auto;margin:20px 0;border:1.5px solid var(--border);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;min-width:500px;background:var(--surface)}
thead tr{background:var(--bg)}
th,td{padding:12px 16px;text-align:left;font-size:13.5px;border-bottom:1px solid var(--border)}
th{font-weight:700;color:var(--text);font-size:12px;text-transform:uppercase;letter-spacing:.04em}
td{color:var(--text-secondary)}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:var(--bg)}
code{background:var(--bg);border:1px solid var(--border);border-radius:5px;padding:1px 6px;font-size:12.5px;font-family:monospace;color:var(--text)}

/* === See Also === */
.see-also-block{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:18px 22px;margin:24px 0}
.see-also-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--text-muted);margin-bottom:12px}
.see-also-list{list-style:none}
.see-also-list li{padding:10px 0;border-bottom:1px solid var(--border);display:flex;flex-direction:column;gap:2px}
.see-also-list li:last-child{border-bottom:none;padding-bottom:0}
.see-also-list li a{font-size:14px;font-weight:600;color:var(--primary)}
.see-also-list li span{font-size:12.5px;color:var(--text-muted)}

/* === Figures / Images === */
.article-figure{margin:24px 0}
.article-img,.gallery-img{width:100%;border-radius:var(--radius);border:1.5px solid var(--border);cursor:zoom-in;transition:opacity .2s,box-shadow .2s}
.article-img:hover,.gallery-img:hover{opacity:.92;box-shadow:0 4px 20px rgba(0,0,0,.12)}
.article-figure figcaption,.gallery-item figcaption{font-size:12.5px;color:var(--text-muted);text-align:center;margin-top:7px}

/* === Lightbox === */
.lightbox{display:none;position:fixed;inset:0;background:rgba(0,0,0,.88);z-index:1000;align-items:center;justify-content:center;padding:24px}
.lightbox.open{display:flex}
#lb-img{max-width:100%;max-height:90vh;border-radius:var(--radius);box-shadow:0 16px 64px rgba(0,0,0,.4)}
.lightbox-close{position:absolute;top:20px;right:24px;background:rgba(255,255,255,.12);border:none;color:#fff;font-size:20px;width:44px;height:44px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s}
.lightbox-close:hover{background:rgba(255,255,255,.25)}

/* === Home page === */
.home-hero{padding:44px 0 36px}
.home-title{font-size:36px;font-weight:800;letter-spacing:-.5px;margin-bottom:10px}
.home-sub{font-size:16px;color:var(--text-secondary);max-width:540px}
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;margin-top:36px}
.cat-card{display:block;background:var(--surface);border:1.5px solid var(--border);border-radius:14px;padding:22px;transition:transform .18s,box-shadow .18s,border-color .18s;text-decoration:none}
.cat-card:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(0,0,0,.09);border-color:var(--primary);text-decoration:none}
.cat-icon{width:42px;height:42px;background:var(--primary-light);border-radius:9px;display:flex;align-items:center;justify-content:center;color:var(--primary);margin-bottom:14px}
.cat-icon svg{width:21px;height:21px}
.cat-title{font-size:14.5px;font-weight:600;color:var(--text);margin-bottom:5px}
.cat-count{font-size:12.5px;color:var(--text-muted)}

/* === Category page === */
.sub-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:11px;margin-top:4px}
.sub-card{display:block;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:18px;font-size:13.5px;font-weight:500;color:var(--text);transition:transform .16s,box-shadow .16s,border-color .16s,color .16s;text-decoration:none}
.sub-card:hover{transform:translateY(-2px);box-shadow:0 3px 12px rgba(0,0,0,.08);border-color:var(--primary);color:var(--primary);text-decoration:none}

/* === Article list === */
.art-list{display:flex;flex-direction:column;gap:10px}
.art-card{display:flex;align-items:center;justify-content:space-between;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:16px 18px;transition:transform .16s,box-shadow .16s,border-color .16s;text-decoration:none}
.art-card:hover{transform:translateY(-1px);box-shadow:0 3px 12px rgba(0,0,0,.08);border-color:var(--primary);text-decoration:none}
.art-card-title{font-size:14px;font-weight:500;color:var(--text)}
.art-card-arrow{color:var(--primary);flex-shrink:0}

/* === Article body === */
.article-body h2{font-size:22px;font-weight:800;margin:32px 0 10px;color:var(--text)}
.article-body h3{font-size:17px;font-weight:700;margin:24px 0 8px;color:var(--text)}
.article-body p{font-size:15px;color:#3a3a50;margin-bottom:13px;line-height:1.75}
.article-body ul,.article-body ol{padding-left:22px;margin-bottom:14px}
.article-body li{font-size:15px;color:#3a3a50;margin-bottom:6px;line-height:1.7}
.article-body strong{color:var(--text);font-weight:600}
section{margin-bottom:8px}

/* === Widgets === */
.widget-section{margin-bottom:48px}
.widget-section-title{font-size:20px;font-weight:700;color:var(--text);margin-bottom:18px;padding-bottom:10px;border-bottom:1.5px solid var(--border)}

/* Accordion */
.accordion{border:1.5px solid var(--border);border-radius:var(--radius);overflow:hidden}
.acc-item{border-bottom:1px solid var(--border)}
.acc-item:last-child{border-bottom:none}
.acc-trigger{width:100%;background:var(--surface);border:none;padding:16px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px;text-align:left;font-size:14.5px;font-weight:600;color:var(--text);cursor:pointer;transition:background .14s;font-family:var(--font)}
.acc-trigger:hover{background:var(--bg)}
.acc-trigger[aria-expanded="true"]{background:var(--primary-light);color:var(--primary)}
.acc-arrow{transition:transform .25s;flex-shrink:0}
.acc-trigger[aria-expanded="true"] .acc-arrow{transform:rotate(180deg)}
.acc-panel{padding:0 18px 16px;font-size:14px;color:var(--text-secondary);line-height:1.7}

/* Tabs */
.tabs{display:flex;gap:4px;border-bottom:2px solid var(--border);margin-bottom:0}
.tab-btn{background:none;border:none;border-bottom:2px solid transparent;padding:10px 18px;font-size:14px;font-weight:600;color:var(--text-secondary);cursor:pointer;margin-bottom:-2px;transition:color .15s,border-color .15s;font-family:var(--font)}
.tab-btn:hover{color:var(--text)}
.tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}
.tab-panels{background:var(--surface);border:1.5px solid var(--border);border-top:none;border-radius:0 0 var(--radius) var(--radius);padding:22px}
.tab-panel p,.tab-panel ul{font-size:14px;color:var(--text-secondary);line-height:1.7}
.tab-panel ul{padding-left:20px}
.tab-panel li{margin-bottom:6px}

/* Steps */
.steps{display:flex;align-items:center;gap:0;flex-wrap:wrap;margin:8px 0}
.step{display:flex;flex-direction:column;align-items:center;gap:6px;min-width:80px}
.step-num{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;background:var(--bg);border:2px solid var(--border);color:var(--text-muted);transition:all .2s}
.step.active .step-num{background:var(--primary);border-color:var(--primary);color:#fff}
.step.done .step-num{background:#3da64a;border-color:#3da64a;color:#fff}
.step-label{font-size:12px;color:var(--text-muted);font-weight:500;text-align:center}
.step.active .step-label{color:var(--primary);font-weight:700}
.step.done .step-label{color:#2c7a36}
.step-connector{flex:1;height:2px;background:var(--border);min-width:20px;margin-bottom:18px}
.step-connector.done{background:#3da64a}

/* Tooltip */
.tooltip-word{border-bottom:1.5px dashed var(--primary);cursor:help;color:var(--primary);position:relative;font-weight:500}
.tooltip-word::after{content:attr(data-tip);position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);background:#1a1a2e;color:#fff;font-size:12px;line-height:1.5;padding:7px 11px;border-radius:7px;white-space:normal;width:220px;text-align:left;z-index:200;opacity:0;pointer-events:none;transition:opacity .18s;box-shadow:0 4px 16px rgba(0,0,0,.25);font-weight:400}
.tooltip-word:hover::after{opacity:1}

/* Code block */
.code-block{border-radius:var(--radius);overflow:hidden;border:1.5px solid var(--border);margin:8px 0}
.code-header{background:#1e1e2e;display:flex;align-items:center;justify-content:space-between;padding:8px 14px}
.code-lang{font-size:12px;color:#9898b8;font-weight:500;text-transform:uppercase;letter-spacing:.06em}
.code-copy{background:rgba(255,255,255,.1);border:none;color:#ccc;padding:4px 12px;border-radius:5px;font-size:12px;cursor:pointer;font-family:var(--font);transition:background .15s}
.code-copy:hover{background:rgba(255,255,255,.2);color:#fff}
.code-block pre{background:#12121f;color:#e2e2f0;padding:16px 18px;overflow-x:auto;font-size:13px;line-height:1.65;font-family:'Fira Code','Cascadia Code',monospace}
.code-block code{background:none;border:none;padding:0;color:inherit;font-family:inherit;font-size:inherit}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin:8px 0}
.gallery-item{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);overflow:hidden;cursor:pointer}
.gallery-img{width:100%;height:140px;object-fit:cover;border-radius:0;border:none;display:block}
.gallery-item figcaption{padding:8px 10px;font-size:12px;color:var(--text-muted)}

/* Modal */
.modal{display:none;position:fixed;inset:0;z-index:500;align-items:center;justify-content:center;padding:20px}
.modal:not([hidden]){display:flex}
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5)}
.modal-box{background:var(--surface);border-radius:14px;box-shadow:0 16px 64px rgba(0,0,0,.15);max-width:520px;width:100%;z-index:1;position:relative;overflow:hidden}
.modal-header{padding:18px 22px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
.modal-title{font-size:16px;font-weight:700;color:var(--text)}
.modal-close{background:none;border:none;font-size:18px;color:var(--text-muted);cursor:pointer;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background .15s}
.modal-close:hover{background:var(--bg)}
.modal-body{padding:22px;font-size:14px;color:var(--text-secondary);line-height:1.7}
.modal-body ul{padding-left:20px;margin-top:10px}
.modal-body li{margin-bottom:6px}
.modal-footer{padding:16px 22px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:10px}

/* Buttons */
.btn-primary,.btn-ghost,.btn-danger,.btn-warning{padding:10px 20px;border-radius:100px;font-size:14px;font-weight:600;cursor:pointer;border:1.5px solid transparent;font-family:var(--font);transition:all .15s}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-hover)}
.btn-ghost{background:var(--surface);color:var(--text-secondary);border-color:var(--border)}
.btn-ghost:hover{background:var(--bg);color:var(--text)}
.btn-danger{background:#dc2626;color:#fff;border-color:#dc2626}
.btn-danger:hover{background:#b91c1c}
.btn-warning{background:#d97706;color:#fff;border-color:#d97706}
.btn-warning:hover{background:#b45309}

/* Toasts */
.toast-container{position:fixed;bottom:24px;right:24px;z-index:600;display:flex;flex-direction:column;gap:10px;min-width:280px;max-width:360px}
.toast{display:flex;align-items:flex-start;gap:10px;padding:14px 16px;border-radius:var(--radius);box-shadow:0 6px 24px rgba(0,0,0,.14);font-size:14px;line-height:1.5;animation:slide-in .2s ease-out}
.toast-success{background:#f0faf1;border:1.5px solid #3da64a;color:#1e4d22}
.toast-warning{background:#fff8ec;border:1.5px solid #e68a00;color:#6b3a00}
.toast-error{background:#fef2f2;border:1.5px solid #dc2626;color:#7f1d1d}
.toast-info{background:#eef2ff;border:1.5px solid #4a6fe2;color:#1a2f6e}
.toast-close{background:none;border:none;margin-left:auto;cursor:pointer;font-size:16px;opacity:.5;line-height:1;color:inherit}
.toast-close:hover{opacity:1}
@keyframes slide-in{from{transform:translateX(30px);opacity:0}to{transform:none;opacity:1}}

/* Responsive */
@media(max-width:900px){.page-wrap{grid-template-columns:1fr}.page-sidebar{display:none}.page-main{padding:22px 0 60px}.page-wrap{padding:0 16px}.site-header{padding:0 16px}.home-title{font-size:26px}}
@media(max-width:600px){.header-nav{display:none}.search-wrap{max-width:unset}.gallery{grid-template-columns:repeat(2,1fr)}}