/* ============ Applications Docs - styles ============ */
:root{
  --bg:#f1f5f9; --surface:#ffffff; --surface-2:#f8fafc; --surface-3:#eef2f7;
  --ink:#0f172a; --muted:#64748b; --muted-2:#94a3b8; --border:#e2e8f0; --border-2:#cbd5e1;
  --primary:#4f46e5; --primary-strong:#4338ca; --primary-soft:#eef2ff;
  --accent:#0d9488; --accent-soft:#f0fdfa;
  --success:#16a34a; --success-soft:#f0fdf4; --success-border:#bbf7d0;
  --warning:#d97706; --warning-soft:#fffbeb; --warning-border:#fde68a;
  --danger:#dc2626; --danger-soft:#fef2f2; --danger-border:#fecaca;
  --info:#2563eb; --info-soft:#eff6ff; --info-border:#bfdbfe;
  --shadow:0 1px 3px rgba(15,23,42,.08),0 1px 2px rgba(15,23,42,.05);
  --shadow-lg:0 10px 30px rgba(15,23,42,.14);
  --radius:12px; --radius-sm:8px;
  --sidebar-w:272px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --topbar-h:58px;
}
[data-theme="dark"]{
  --bg:#0b1220; --surface:#111a2e; --surface-2:#0f172a; --surface-3:#1e293b;
  --ink:#e2e8f0; --muted:#94a3b8; --muted-2:#64748b; --border:#1e293b; --border-2:#334155;
  --primary:#818cf8; --primary-strong:#a5b4fc; --primary-soft:#1e1b4b;
  --accent:#2dd4bf; --accent-soft:#042f2e;
  --success:#4ade80; --success-soft:#052e16; --success-border:#166534;
  --warning:#fbbf24; --warning-soft:#451a03; --warning-border:#92400e;
  --danger:#f87171; --danger-soft:#450a0a; --danger-border:#991b1b;
  --info:#60a5fa; --info-soft:#172554; --info-border:#1e40af;
  --shadow:0 1px 3px rgba(0,0,0,.4),0 1px 2px rgba(0,0,0,.3);
  --shadow-lg:0 12px 34px rgba(0,0,0,.5);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
code{font-family:var(--mono);font-size:.86em;background:var(--surface-3);border:1px solid var(--border);border-radius:5px;padding:.1em .35em}
pre{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;overflow:auto;font-family:var(--mono);font-size:.85rem;line-height:1.55}
pre code{background:none;border:0;padding:0;font-size:inherit}
kbd{font-family:var(--mono);font-size:.78em;background:var(--surface-3);border:1px solid var(--border-2);border-bottom-width:2px;border-radius:5px;padding:.1em .4em}
table{border-collapse:collapse;width:100%;margin:14px 0;font-size:.92rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--border);vertical-align:top}
th{background:var(--surface-2);font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
tr:last-child td{border-bottom:0}
.skip-link{position:absolute;left:-999px;top:8px;z-index:200;background:var(--primary);color:#fff;padding:8px 14px;border-radius:6px;font-weight:600}
.skip-link:focus{left:8px}

/* ============ Layout ============ */
.app-shell{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar-w);flex:0 0 var(--sidebar-w);background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;z-index:100}
.main-col{flex:1;margin-left:var(--sidebar-w);min-width:0;display:flex;flex-direction:column}
.content{max-width:880px;width:100%;margin:0 auto;padding:28px 40px 80px;flex:1}
.sidebar-brand{display:flex;align-items:center;gap:11px;padding:18px 20px 14px}
.brand-mark{display:inline-flex}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text strong{font-size:.98rem;letter-spacing:.01em}
.brand-text span{font-size:.75rem;color:var(--muted)}
.nav{flex:1;overflow-y:auto;padding:6px 12px 16px;scrollbar-width:thin}
.nav-group-label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--muted-2);padding:14px 10px 6px}
.nav-link{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:8px;color:var(--ink);font-size:.9rem;line-height:1.35;border:1px solid transparent}
.nav-link svg{flex:0 0 auto;color:var(--muted)}
.nav-link:hover{background:var(--surface-2);text-decoration:none;color:var(--ink)}
.nav-link.active{background:var(--primary-soft);color:var(--primary-strong);font-weight:600}
.nav-link.active svg{color:var(--primary)}
.nav-sub{margin-left:8px;border-left:1px solid var(--border);padding-left:6px}
.nav-sub .nav-link{font-size:.84rem;padding:6px 9px}
.sidebar-footer{padding:12px 20px;border-top:1px solid var(--border);font-size:.76rem;color:var(--muted);display:flex;align-items:center;gap:8px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--success);display:inline-block}
.scrim{display:none}

/* ============ Topbar ============ */
.topbar{position:sticky;top:0;z-index:90;height:var(--topbar-h);display:flex;align-items:center;gap:12px;padding:0 20px;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.search-wrap{position:relative;flex:1;max-width:520px}
.search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted);pointer-events:none}
#searchInput{width:100%;height:38px;padding:0 14px 0 36px;border:1px solid var(--border);border-radius:9px;background:var(--surface-2);color:var(--ink);font:inherit;font-size:.9rem;outline:none;transition:border-color .15s,box-shadow .15s}
#searchInput:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft);background:var(--surface)}
#searchInput::placeholder{color:var(--muted-2)}
.search-results{position:absolute;top:44px;left:0;right:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);max-height:420px;overflow:auto;z-index:120}
.search-result{padding:10px 14px;cursor:pointer;border-bottom:1px solid var(--border)}
.search-result:last-child{border-bottom:0}
.search-result:hover,.search-result.focused{background:var(--primary-soft)}
.search-result .sr-title{font-size:.88rem;font-weight:600;color:var(--ink)}
.search-result .sr-path{font-size:.74rem;color:var(--muted)}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border:1px solid var(--border);background:var(--surface);color:var(--muted);border-radius:9px;cursor:pointer;transition:color .15s,background .15s,border-color .15s}
.icon-btn:hover{color:var(--primary);border-color:var(--primary)}
#menuBtn{display:none}
.icon-moon{display:none}
[data-theme="dark"] .icon-sun{display:none}
[data-theme="dark"] .icon-moon{display:block}

/* ============ Breadcrumbs ============ */
.breadcrumbs{max-width:880px;width:100%;margin:0 auto;padding:14px 40px 0;font-size:.8rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:4px;align-items:center}
.breadcrumbs a{color:var(--muted)}
.breadcrumbs a:hover{color:var(--primary)}
.breadcrumbs .sep{color:var(--muted-2);margin:0 3px}
.breadcrumbs .current{color:var(--ink);font-weight:600}

/* ============ Typography ============ */
.hero{padding:34px 0 18px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.74rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--primary);background:var(--primary-soft);border:1px solid color-mix(in srgb,var(--primary) 22%,transparent);padding:5px 12px;border-radius:999px;margin-bottom:16px}
.hero h1{font-size:2.1rem;line-height:1.15;margin:0 0 12px;letter-spacing:-.02em}
.hero .lede{font-size:1.08rem;color:var(--muted);max-width:62ch;margin:0 0 22px}
h1{font-size:1.9rem;line-height:1.2;margin:0 0 10px;letter-spacing:-.02em}
h2{font-size:1.32rem;margin:34px 0 12px;padding-top:8px;letter-spacing:-.01em;scroll-margin-top:calc(var(--topbar-h) + 12px)}
h3{font-size:1.06rem;margin:24px 0 8px}
h4{font-size:.95rem;margin:18px 0 6px}
p{margin:10px 0}
ul,ol{margin:10px 0;padding-left:22px}
li{margin:5px 0}
.lead{font-size:1.05rem;color:var(--muted)}

/* ============ Cards & grid ============ */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin:18px 0}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s,border-color .15s}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--border-2)}
.card h3{margin:0 0 6px;font-size:.98rem}
.card p{margin:0;font-size:.85rem;color:var(--muted)}
.card .card-icon{display:inline-flex;width:38px;height:38px;border-radius:10px;background:var(--primary-soft);color:var(--primary);align-items:center;justify-content:center;margin-bottom:12px}
.course-card{border-top:3px solid var(--primary);display:block}
.course-card .meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;font-size:.74rem;color:var(--muted)}
.progress-track{height:6px;border-radius:99px;background:var(--surface-3);overflow:hidden;margin-top:12px}
.progress-fill{height:100%;border-radius:99px;background:var(--primary);width:0;transition:width .3s}

/* ============ Callouts ============ */
.callout{border-radius:var(--radius-sm);padding:13px 16px;margin:16px 0;font-size:.92rem;border:1px solid}
.callout .co-title{font-weight:700;display:flex;align-items:center;gap:8px;margin-bottom:4px;font-size:.86rem}
.callout.info{background:var(--info-soft);border-color:var(--info-border);color:var(--ink)}
.callout.info .co-title{color:var(--info)}
.callout.warn{background:var(--warning-soft);border-color:var(--warning-border);color:var(--ink)}
.callout.warn .co-title{color:var(--warning)}
.callout.success{background:var(--success-soft);border-color:var(--success-border);color:var(--ink)}
.callout.success .co-title{color:var(--success)}
.callout.danger{background:var(--danger-soft);border-color:var(--danger-border);color:var(--ink)}
.callout.danger .co-title{color:var(--danger)}

/* ============ Badges & pills ============ */
.badge{display:inline-flex;align-items:center;gap:6px;font-size:.72rem;font-weight:700;letter-spacing:.04em;border-radius:999px;padding:3px 10px;border:1px solid}
.badge.role-admin{background:var(--danger-soft);color:var(--danger);border-color:var(--danger-border)}
.badge.role-manager{background:var(--warning-soft);color:var(--warning);border-color:var(--warning-border)}
.badge.role-view{background:var(--info-soft);color:var(--info);border-color:var(--info-border)}
.badge.status{background:var(--primary-soft);color:var(--primary-strong);border-color:color-mix(in srgb,var(--primary) 30%,transparent)}
.status-pill{display:inline-flex;font-size:.74rem;font-weight:600;border-radius:999px;padding:2px 9px}
.status-new{background:var(--info-soft);color:var(--info);border:1px solid var(--info-border)}
.status-review{background:var(--warning-soft);color:var(--warning);border:1px solid var(--warning-border)}
.status-interview{background:var(--primary-soft);color:var(--primary-strong);border:1px solid color-mix(in srgb,var(--primary) 30%,transparent)}
.status-offer{background:var(--accent-soft);color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 35%,transparent)}
.status-hired{background:var(--success-soft);color:var(--success);border:1px solid var(--success-border)}
.status-rejected{background:var(--surface-3);color:var(--muted);border:1px solid var(--border-2)}

/* ============ Diagrams ============ */
.dg{margin:20px 0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.dg-title{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 8px}
.dg svg{width:100%;height:auto;display:block}
.dg svg text{font-family:var(--font);fill:var(--ink);font-size:12px}
.dg .node rect{fill:var(--surface-2);stroke:var(--border-2);stroke-width:1.2;rx:10}
.dg .node.primary rect{fill:var(--primary-soft);stroke:var(--primary);stroke-width:1.6}
.dg .node.accent rect{fill:var(--accent-soft);stroke:var(--accent);stroke-width:1.4}
.dg .node.success rect{fill:var(--success-soft);stroke:var(--success)}
.dg .node.warn rect{fill:var(--warning-soft);stroke:var(--warning)}
.dg .node text{font-size:12px;font-weight:600}
.dg .node .sub{font-size:10.5px;font-weight:400;fill:var(--muted)}
.dg .edge{stroke:var(--muted-2);stroke-width:1.4;fill:none;marker-end:url(#arrow)}
.dg .edge-label{font-size:10px;fill:var(--muted)}
.dg .edge-label.on{fill:var(--success);font-weight:700}
.dg .edge-label.off{fill:var(--danger);font-weight:700}
.dg .legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:10px;font-size:.76rem;color:var(--muted)}
.dg .legend span{display:inline-flex;align-items:center;gap:6px}

/* ============ Course page ============ */
.course-header{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow);margin:18px 0}
.course-header h1{margin:8px 0 6px;font-size:1.5rem}
.course-header .meta{display:flex;gap:10px;flex-wrap:wrap;align-items:center;font-size:.8rem;color:var(--muted)}
.course-progress{display:flex;align-items:center;gap:14px;margin-top:16px}
.course-progress .progress-track{flex:1;margin-top:0}
.course-progress .pct{font-weight:700;font-size:.85rem;color:var(--primary);min-width:38px;text-align:right}
.lesson{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);margin:10px 0;overflow:hidden}
.lesson-head{display:flex;align-items:center;gap:12px;width:100%;padding:13px 16px;background:none;border:0;cursor:pointer;font:inherit;color:var(--ink);text-align:left}
.lesson-head:hover{background:var(--surface-2)}
.lesson-num{flex:0 0 auto;width:26px;height:26px;border-radius:8px;background:var(--primary-soft);color:var(--primary-strong);font-size:.78rem;font-weight:700;display:inline-flex;align-items:center;justify-content:center}
.lesson-head.read .lesson-num{background:var(--success-soft);color:var(--success)}
.lesson-title{flex:1;font-weight:600;font-size:.95rem}
.lesson-time{font-size:.74rem;color:var(--muted-2)}
.lesson-chev{color:var(--muted-2);transition:transform .2s}
.lesson.open .lesson-chev{transform:rotate(180deg)}
.lesson-body{display:none;padding:4px 20px 18px 54px;border-top:1px solid var(--border)}
.lesson.open .lesson-body{display:block}
.exercise{border:1px solid var(--accent);background:var(--accent-soft);border-radius:var(--radius-sm);padding:18px 20px;margin:18px 0}
.exercise h3{color:var(--accent);margin-top:0}
.exercise ol{margin:8px 0}
.exercise ol li{margin:6px 0}
.quiz{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;margin:18px 0}
.quiz h3{margin-top:0}
.q-item{margin:16px 0;padding:14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface-2)}
.q-item .q-text{font-weight:600;margin-bottom:10px;font-size:.95rem}
.q-item .opts{display:flex;flex-direction:column;gap:7px}
.q-item label{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border:1px solid var(--border);border-radius:8px;background:var(--surface);cursor:pointer;font-size:.9rem;transition:border-color .15s,background .15s}
.q-item label:hover{border-color:var(--primary)}
.q-item label.correct{border-color:var(--success);background:var(--success-soft)}
.q-item label.wrong{border-color:var(--danger);background:var(--danger-soft)}
.q-item .explain{display:none;margin-top:10px;font-size:.85rem;color:var(--muted);border-left:3px solid var(--primary);padding-left:10px}
.q-item .explain.show{display:block}
.criteria-list{list-style:none;padding:0;margin:10px 0}
.criteria-list li{display:flex;gap:10px;align-items:flex-start;padding:7px 0;border-bottom:1px dashed var(--border)}
.criteria-list li:last-child{border-bottom:0}
.criteria-list .ck{flex:0 0 auto;width:20px;height:20px;border-radius:6px;border:1.5px solid var(--border-2);display:inline-flex;align-items:center;justify-content:center;color:transparent;font-size:.8rem;margin-top:2px}
.criteria-list li.done .ck{background:var(--success);border-color:var(--success);color:#fff}
.criteria-list li.done{color:var(--muted)}
.course-nav{display:flex;justify-content:space-between;gap:12px;margin-top:26px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:9px 16px;border-radius:9px;font-weight:600;font-size:.88rem;cursor:pointer;border:1px solid var(--border);background:var(--surface);color:var(--ink);transition:background .15s,border-color .15s}
.btn:hover{text-decoration:none;border-color:var(--primary);color:var(--primary)}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn.primary:hover{background:var(--primary-strong);color:#fff}
.btn.success{background:var(--success);border-color:var(--success);color:#fff}
.btn.success:hover{filter:brightness(.94);color:#fff}
.btn.ghost{background:none;border-color:transparent;color:var(--muted)}
.btn.ghost:hover{color:var(--primary)}

/* ============ Table of contents ============ */
.toc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 18px;margin:18px 0;font-size:.9rem}
.toc-title{font-size:.74rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-bottom:8px}
.toc a{display:block;padding:3px 0;color:var(--ink)}
.toc a:hover{color:var(--primary);text-decoration:none}
.toc a::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--border-2);margin-right:10px;vertical-align:2px}
.toc a:hover::before{background:var(--primary)}

/* ============ Search page ============ */
.result-list{list-style:none;padding:0;margin:16px 0}
.result-list li{border:1px solid var(--border);background:var(--surface);border-radius:var(--radius-sm);padding:14px 16px;margin:10px 0;box-shadow:var(--shadow)}
.result-list a{font-weight:600;font-size:.98rem}
.result-list p{margin:4px 0 0;font-size:.86rem;color:var(--muted)}
mark{background:var(--warning-soft);color:inherit;padding:0 2px;border-radius:3px}

/* ============ Misc ============ */
.steps{counter-reset:step;list-style:none;padding-left:0}
.steps li{position:relative;padding-left:40px;margin:10px 0}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:2px;width:26px;height:26px;border-radius:50%;background:var(--primary);color:#fff;font-size:.78rem;font-weight:700;display:flex;align-items:center;justify-content:center}
.footer{max-width:880px;width:100%;margin:0 auto;padding:20px 40px 30px;font-size:.78rem;color:var(--muted-2);border-top:1px solid var(--border)}
.anchor{scroll-margin-top:calc(var(--topbar-h) + 14px)}
.empty-state{text-align:center;padding:60px 20px;color:var(--muted)}
.empty-state .big{font-size:2rem;margin-bottom:8px}

/* ============ Print ============ */
@media print{
  .sidebar,.topbar,.breadcrumbs,.footer,.course-nav,.search-wrap,#menuBtn,#themeBtn{display:none!important}
  .main-col{margin:0}
  .content{padding:0;max-width:none}
  body{background:#fff;color:#000;font-size:12pt}
  a{color:#000}
  .card,.course-header,.dg,.lesson,.quiz,.exercise,.callout{border-color:#ccc;box-shadow:none;break-inside:avoid}
  .lesson-body{display:block!important}
  h1,h2,h3{break-after:avoid}
}

/* ============ Responsive ============ */
@media (max-width:1080px){
  .content{padding:24px 28px 70px}
  .breadcrumbs{padding:12px 28px 0}
  .footer{padding:18px 28px 26px}
}
@media (max-width:860px){
  .sidebar{transform:translateX(-100%);transition:transform .24s ease;box-shadow:none}
  body.nav-open .sidebar{transform:translateX(0);box-shadow:var(--shadow-lg)}
  .main-col{margin-left:0}
  #menuBtn{display:inline-flex}
  .scrim{display:block;position:fixed;inset:0;background:rgba(15,23,42,.45);border:0;z-index:95;cursor:pointer}
  .hero h1{font-size:1.7rem}
  .content{padding:20px 18px 60px}
  .breadcrumbs{padding:10px 18px 0}
  .footer{padding:16px 18px 24px}
  .topbar{padding:0 12px;gap:8px}
  .search-wrap{max-width:none}
  .card-grid{grid-template-columns:1fr}
}
@media (max-width:520px){
  .hero h1{font-size:1.5rem}
  .lesson-body{padding-left:18px}
  .course-nav{flex-direction:column}
  .course-nav .btn{width:100%;justify-content:center}
}