:root{
  --sf-blue:#0176d3;
  --sf-blue-dark:#014486;
  --sf-navy:#032d60;
  --sf-cloud:#e3f3ff;
  --sf-sky:#d8edff;
  --ink:#181818;
  --muted:#5c5c5c;
  --line:#e5e5e5;
  --bg:#f3f6f9;
  --card:#ffffff;
  --green:#2e844a;
  --amber:#fe9339;
  --amber-bg:#fef5e7;
  --red:#ea001e;
  --purple:#7526e3;
  --radius:14px;
  --shadow:0 2px 10px rgba(0,40,80,.08);
  --shadow-lg:0 12px 40px rgba(0,40,80,.16);
  --sans:"Segoe UI",Salesforce Sans,Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--sf-blue);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* ---------- Top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  background:linear-gradient(100deg,var(--sf-navy),var(--sf-blue));
  color:#fff;
  display:flex;align-items:center;gap:14px;
  padding:10px 18px;
  box-shadow:0 2px 8px rgba(0,0,0,.2);
}
.topbar .logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;white-space:nowrap}
.topbar .logo .cloud{font-size:22px}
.topbar .spacer{flex:1}
.searchbox{
  position:relative;flex:1;max-width:520px;
}
.searchbox input{
  width:100%;border:none;border-radius:999px;
  padding:9px 16px 9px 40px;font-size:14px;outline:none;
  background:rgba(255,255,255,.95);
}
.searchbox .ico{position:absolute;left:14px;top:50%;transform:translateY(-50%);opacity:.6}
.btn-ghost{
  background:rgba(255,255,255,.15);color:#fff;border:1px solid rgba(255,255,255,.35);
  border-radius:999px;padding:8px 14px;font-size:13px;cursor:pointer;white-space:nowrap;
}
.btn-ghost:hover{background:rgba(255,255,255,.28)}
.menu-toggle{display:none;background:none;border:none;color:#fff;font-size:22px;cursor:pointer}

/* ---------- Layout ---------- */
.layout{display:flex;min-height:calc(100vh - 56px)}
.sidebar{
  width:320px;flex:0 0 320px;background:var(--card);
  border-right:1px solid var(--line);
  overflow-y:auto;max-height:calc(100vh - 56px);position:sticky;top:56px;
  padding:14px 10px 60px;
}
.main{flex:1;min-width:0;padding:26px clamp(16px,4vw,48px) 80px;max-width:1000px;margin:0 auto}

/* progress */
.progress-wrap{padding:6px 10px 14px}
.progress-bar{height:8px;border-radius:99px;background:var(--sf-sky);overflow:hidden}
.progress-bar>i{display:block;height:100%;background:var(--green);width:0;transition:width .4s}
.progress-label{font-size:12px;color:var(--muted);margin-top:6px}

/* sidebar modules */
.mod{margin-bottom:6px}
.mod-head{
  display:flex;align-items:center;gap:8px;cursor:pointer;
  padding:9px 10px;border-radius:10px;font-weight:600;font-size:14px;
}
.mod-head:hover{background:var(--sf-cloud)}
.mod-head .chev{transition:transform .2s;opacity:.6}
.mod.open .mod-head .chev{transform:rotate(90deg)}
.mod-head .lvl{font-size:10px;font-weight:700;padding:2px 7px;border-radius:99px;text-transform:uppercase;letter-spacing:.4px}
.lvl.beginner{background:#e3f6ea;color:var(--green)}
.lvl.intermediate{background:#e7f0ff;color:var(--sf-blue)}
.lvl.advanced{background:#f1e6ff;color:var(--purple)}
.lvl.capstone{background:#dff6f2;color:#0b7a6b}
.lvl.cert{background:var(--amber-bg);color:#a85c00}
.lessons{display:none;padding:2px 0 6px 8px}
.mod.open .lessons{display:block}
.lesson-link{
  display:flex;align-items:center;gap:8px;
  padding:7px 10px;border-radius:8px;font-size:13.5px;color:var(--ink);cursor:pointer;
}
.lesson-link:hover{background:var(--bg)}
.lesson-link.active{background:var(--sf-blue);color:#fff}
.lesson-link .dot{width:16px;height:16px;flex:0 0 16px;border:2px solid var(--line);border-radius:50%;display:grid;place-items:center;font-size:10px}
.lesson-link.active .dot{border-color:#fff}
.lesson-link.done .dot{background:var(--green);border-color:var(--green);color:#fff}

/* ---------- Content blocks ---------- */
.crumbs{font-size:13px;color:var(--muted);margin-bottom:6px}
.lesson-title{font-size:clamp(24px,4vw,34px);line-height:1.2;margin:2px 0 4px;color:var(--sf-navy)}
.lesson-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:18px}
.pill{background:var(--sf-cloud);color:var(--sf-blue-dark);border-radius:99px;padding:3px 10px;font-size:12px;font-weight:600}

.objectives{background:var(--card);border:1px solid var(--line);border-left:5px solid var(--sf-blue);border-radius:12px;padding:14px 18px;margin:0 0 22px}
.objectives h4{margin:0 0 8px;font-size:14px;color:var(--sf-navy);text-transform:uppercase;letter-spacing:.5px}
.objectives ul{margin:0;padding-left:20px}

h2.block{font-size:22px;color:var(--sf-navy);margin:30px 0 10px;padding-bottom:6px;border-bottom:2px solid var(--sf-cloud)}
h3.block{font-size:17px;color:var(--sf-blue-dark);margin:22px 0 8px}
p.block{margin:10px 0}
.block ul,.block ol{margin:10px 0;padding-left:22px}
.block code{background:#eef3f8;padding:1px 6px;border-radius:5px;font-size:.92em;color:#b4004b;font-family:Consolas,Monaco,monospace}
.kbd{background:#fff;border:1px solid #ccc;border-bottom-width:2px;border-radius:5px;padding:1px 7px;font-size:.85em;font-family:Consolas,monospace}

/* steps */
.steps{counter-reset:step;margin:16px 0;display:flex;flex-direction:column;gap:18px}
.step{
  display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:start;
  background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;box-shadow:var(--shadow);
}
.step .num{
  counter-increment:step;
  width:34px;height:34px;border-radius:50%;background:var(--sf-blue);color:#fff;
  display:grid;place-items:center;font-weight:700;
}
.step .num::before{content:counter(step)}
.step .body h4{margin:2px 0 6px;font-size:15.5px;color:var(--sf-navy)}
.step .visual{margin-top:12px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fbfdff}
.step .visual svg{display:block;width:100%;height:auto}
.step .cap{font-size:12.5px;color:var(--muted);padding:8px 12px;background:#f7fafd;border-top:1px solid var(--line)}

/* standalone visual */
.figure{margin:20px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);background:#fbfdff}
.figure svg{display:block;width:100%;height:auto}
.figure .cap{font-size:13px;color:var(--muted);padding:9px 14px;background:#f7fafd;border-top:1px solid var(--line)}
.figure .cap b{color:var(--sf-navy)}

/* callouts */
.callout{border-radius:12px;padding:14px 16px 14px 48px;margin:16px 0;position:relative;font-size:14.5px}
.callout::before{position:absolute;left:16px;top:14px;font-size:18px}
.callout.tip{background:#eafaf0;border:1px solid #bfe6cc}
.callout.tip::before{content:"💡"}
.callout.warn{background:var(--amber-bg);border:1px solid #f5d9ad}
.callout.warn::before{content:"⚠️"}
.callout.trick{background:#f2ebff;border:1px solid #ddccf7}
.callout.trick::before{content:"🎯"}
.callout.info{background:#e9f4ff;border:1px solid #bfe0ff}
.callout.info::before{content:"ℹ️"}
.callout b{color:var(--sf-navy)}

/* table */
.tbl{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px;background:var(--card);border-radius:10px;overflow:hidden;box-shadow:var(--shadow)}
.tbl th{background:var(--sf-navy);color:#fff;text-align:left;padding:10px 12px;font-weight:600}
.tbl td{padding:9px 12px;border-top:1px solid var(--line);vertical-align:top}
.tbl tr:nth-child(even) td{background:#f7fafd}

/* exercise */
.exercise{border:1px solid #bfe0ff;background:#f2f9ff;border-radius:14px;padding:18px;margin:24px 0}
.exercise h3{margin:0 0 6px;color:var(--sf-blue-dark);display:flex;align-items:center;gap:8px}
.exercise .goal{font-size:13px;color:var(--muted);margin-bottom:10px}
.exercise ol{margin:6px 0}
.exercise .reveal{margin-top:12px}
.exercise summary{cursor:pointer;font-weight:600;color:var(--sf-blue);padding:8px 12px;background:#fff;border:1px solid var(--line);border-radius:8px;display:inline-block}
.exercise .sol{margin-top:10px;background:#fff;border:1px dashed var(--line);border-radius:8px;padding:12px 14px;font-size:14px}

/* quiz */
.quiz{border:1px solid var(--line);background:var(--card);border-radius:14px;padding:18px;margin:24px 0;box-shadow:var(--shadow)}
.quiz h3{margin:0 0 4px;color:var(--sf-navy);display:flex;gap:8px;align-items:center}
.quiz .q{font-weight:600;margin:10px 0}
.quiz .opt{display:block;width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:9px;padding:11px 14px;margin:8px 0;cursor:pointer;font-size:14px;transition:.15s}
.quiz .opt:hover{border-color:var(--sf-blue);background:var(--sf-cloud)}
.quiz .opt.correct{border-color:var(--green);background:#e9f9ef}
.quiz .opt.wrong{border-color:var(--red);background:#fdeaec}
.quiz .explain{display:none;margin-top:10px;padding:12px;border-radius:9px;background:#eef6ff;font-size:14px}
.quiz .explain.show{display:block}

/* lesson footer nav */
.lesson-foot{display:flex;justify-content:space-between;gap:12px;margin-top:40px;flex-wrap:wrap}
.nav-btn{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 18px;cursor:pointer;min-width:200px;box-shadow:var(--shadow);text-align:left}
.nav-btn:hover{border-color:var(--sf-blue)}
.nav-btn small{display:block;color:var(--muted);font-size:12px}
.nav-btn b{color:var(--sf-navy)}
.nav-btn.next{text-align:right;margin-left:auto}
.mark-done{background:var(--green);color:#fff;border:none;border-radius:12px;padding:12px 20px;font-size:15px;font-weight:600;cursor:pointer;box-shadow:var(--shadow)}
.mark-done.is-done{background:#eef4f0;color:var(--green);border:1px solid var(--green)}
.foot-actions{display:flex;justify-content:center;margin-top:26px}

/* home / hero */
.hero{background:linear-gradient(120deg,var(--sf-navy),var(--sf-blue));color:#fff;border-radius:20px;padding:clamp(24px,5vw,48px);margin-bottom:26px;position:relative;overflow:hidden}
.hero h1{font-size:clamp(26px,5vw,40px);margin:0 0 10px;line-height:1.15}
.hero p{font-size:clamp(15px,2.4vw,18px);max-width:640px;opacity:.95;margin:0 0 20px}
.hero .cta{display:inline-block;background:#fff;color:var(--sf-blue-dark);font-weight:700;border-radius:999px;padding:12px 24px;cursor:pointer}
.hero .cloud-art{position:absolute;right:-10px;bottom:-20px;font-size:150px;opacity:.15}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.hero-badges span{background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.3);padding:6px 12px;border-radius:99px;font-size:13px}

.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin:18px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow);cursor:pointer;transition:.15s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--sf-blue)}
.card .ic{font-size:26px}
.card h3{margin:8px 0 4px;color:var(--sf-navy);font-size:17px}
.card p{margin:0;color:var(--muted);font-size:13.5px}
.card .meta{margin-top:10px;font-size:12px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap}

.section-title{font-size:20px;color:var(--sf-navy);margin:28px 0 4px}
.section-sub{color:var(--muted);margin:0 0 8px;font-size:14px}

/* Ask / knowledge base panel */
.ask-panel{position:fixed;inset:0;background:rgba(3,45,96,.4);display:none;z-index:100;padding:40px 16px;overflow-y:auto}
.ask-panel.open{display:block}
.ask-card{background:#fff;max-width:760px;margin:0 auto;border-radius:16px;box-shadow:var(--shadow-lg);overflow:hidden}
.ask-head{background:linear-gradient(100deg,var(--sf-navy),var(--sf-blue));color:#fff;padding:18px 22px}
.ask-head h2{margin:0 0 4px;font-size:20px}
.ask-head p{margin:0;font-size:13px;opacity:.9}
.ask-body{padding:20px 22px 26px}
.ask-search{position:relative;margin-bottom:14px}
.ask-search input{width:100%;border:1px solid var(--line);border-radius:10px;padding:12px 14px 12px 40px;font-size:15px;outline:none}
.ask-search input:focus{border-color:var(--sf-blue)}
.ask-search .ico{position:absolute;left:13px;top:50%;transform:translateY(-50%);opacity:.5}
.ask-close{position:absolute;right:16px;top:14px;background:rgba(255,255,255,.2);border:none;color:#fff;width:34px;height:34px;border-radius:50%;cursor:pointer;font-size:18px}
.ask-tags{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:14px}
.ask-tags button{background:var(--sf-cloud);border:1px solid var(--sf-sky);color:var(--sf-blue-dark);border-radius:99px;padding:5px 12px;font-size:12.5px;cursor:pointer}
.ask-tags button:hover{background:var(--sf-sky)}
.faq-item{border:1px solid var(--line);border-radius:10px;margin-bottom:8px;overflow:hidden}
.faq-item summary{cursor:pointer;padding:12px 14px;font-weight:600;color:var(--sf-navy);font-size:14.5px;list-style:none;display:flex;justify-content:space-between;gap:10px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--sf-blue);font-weight:700}
.faq-item[open] summary::after{content:"–"}
.faq-item .ans{padding:0 14px 14px;font-size:14px;color:#333}
.faq-item .ans code{background:#eef3f8;padding:1px 5px;border-radius:4px;font-family:Consolas,monospace}
.ask-none{color:var(--muted);text-align:center;padding:20px;font-size:14px}
.ask-cat{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--sf-blue);margin:14px 0 6px}

/* search results view */
.search-results .hit{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px;cursor:pointer;box-shadow:var(--shadow)}
.search-results .hit:hover{border-color:var(--sf-blue)}
.search-results .hit .path{font-size:12px;color:var(--muted)}
.search-results .hit h3{margin:3px 0;color:var(--sf-navy);font-size:16px}
.search-results mark{background:#fff2ac;padding:0 2px}

/* misc */
.badge-row{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}.badge{display:inline-flex;align-items:center;gap:6px;background:var(--card);border:1px solid var(--line);border-radius:99px;padding:6px 12px;font-size:13px;box-shadow:var(--shadow)}
.divider{height:1px;background:var(--line);margin:26px 0}
.center{text-align:center}
.muted{color:var(--muted)}
.glossary dt{font-weight:700;color:var(--sf-navy);margin-top:12px}
.glossary dd{margin:2px 0 0;color:#333}

/* responsive */
@media (max-width:900px){
  .sidebar{position:fixed;left:0;top:56px;bottom:0;transform:translateX(-100%);transition:transform .25s;z-index:60;box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:none}
  .menu-toggle{display:block}
  .topbar .logo span.full{display:none}
}
@media (max-width:600px){
  .searchbox{max-width:none}
  .btn-ghost.hide-sm{display:none}
  .step{grid-template-columns:32px 1fr}
}

/* byline, footer, language note */
.hero .byline{margin-top:16px;font-size:13px;opacity:.9}
.hero .byline b{background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.3);padding:3px 10px;border-radius:99px}
.site-foot{background:var(--sf-navy);color:#cfe4fb;text-align:center;padding:18px 16px;font-size:12.5px;line-height:1.7}
.site-foot b{color:#fff}
.ja-note{background:#eef6ff;border:1px solid #bfe0ff;border-radius:10px;padding:10px 14px;margin:0 0 18px;font-size:13.5px;color:#0b3d70}
#langToggle{font-weight:600}