/* CND Virtual Lab — theme tokens, RTL-safe logical properties */
:root{
  --bg:#f4f6fb; --panel:#ffffff; --panel2:#f8fafc; --ink:#0f172a; --muted:#5b6478; --line:#e2e8f0;
  --brand:#0b5cad; --brand2:#0e7490; --brand-ink:#fff; --accent:#f59e0b;
  --ok:#15803d; --ok-bg:#dcfce7; --bad:#b91c1c; --bad-bg:#fee2e2; --warn:#a16207; --warn-bg:#fef3c7; --info:#1d4ed8; --info-bg:#dbeafe;
  --code-bg:#0b1220; --code-ink:#d1e4ff; --shadow:0 1px 2px rgba(15,23,42,.06),0 4px 16px rgba(15,23,42,.06);
  --radius:12px; --side:300px; --top:60px;
  --font:"Segoe UI",system-ui,-apple-system,"Noto Sans","Noto Sans Arabic",Tahoma,Arial,sans-serif;
  --mono:ui-monospace,"Cascadia Code","Consolas","SFMono-Regular",Menlo,monospace;
}
[data-theme="dark"]{
  --bg:#0b1020; --panel:#121a2e; --panel2:#0f1628; --ink:#e5ecff; --muted:#93a0bd; --line:#24304b;
  --brand:#3b8cff; --brand2:#22b8cf; --ok:#4ade80; --ok-bg:#0f2e1c; --bad:#f87171; --bad-bg:#3a1414; --warn:#fbbf24; --warn-bg:#33270a; --info:#93c5fd; --info-bg:#11254a;
  --code-bg:#060a14; --shadow:0 1px 2px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:var(--font);background:var(--bg);color:var(--ink);font-size:15px;line-height:1.55;display:flex;flex-direction:column;min-height:100vh}
html[dir="rtl"] body{font-size:15.5px}
a{color:var(--brand)}
code,pre,.mono{font-family:var(--mono);font-size:.88em}
.ltr{direction:ltr;unicode-bidi:isolate;display:inline-block}
button{font:inherit}

/* Top bar */
.topbar{position:sticky;top:0;z-index:30;height:var(--top);display:flex;align-items:center;gap:12px;padding-inline:16px;background:linear-gradient(90deg,#0a2a54,#0b5cad 60%,#0e7490);color:#fff;box-shadow:0 2px 10px rgba(0,0,0,.15)}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;min-width:0;flex:1}
.brand-logo{font-size:26px}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-title{font-weight:700;font-size:17px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand-sub{font-size:12.5px;opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar-actions{display:flex;gap:8px}
.btn{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:9px;padding:7px 13px;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:.15s;white-space:nowrap}
.btn:hover{border-color:var(--brand);color:var(--brand)}
.btn.primary{background:var(--brand);color:#fff;border-color:transparent}
.btn.primary:hover{filter:brightness(1.1);color:#fff}
.btn.small{padding:4px 9px;font-size:13px}
.topbar .btn{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.25);color:#fff}
.topbar .btn.primary{background:#fff;color:#0b5cad;font-weight:600}
.btn:disabled{opacity:.45;cursor:not-allowed}
.only-mobile{display:none}

/* Layout */
.layout{display:flex;flex:1;min-height:0}
.sidebar{width:var(--side);flex:none;background:var(--panel);border-inline-end:1px solid var(--line);position:sticky;top:var(--top);height:calc(100vh - var(--top));overflow-y:auto;padding:12px 10px 30px}
.main{flex:1;min-width:0;padding:22px clamp(14px,3vw,34px) 40px;outline:none}
.scrim{display:none}

/* Sidebar */
.side-search{width:100%;padding:8px 11px;border:1px solid var(--line);border-radius:9px;background:var(--panel2);color:var(--ink);margin-bottom:10px}
.side-progress{font-size:12.5px;color:var(--muted);margin:2px 4px 10px}
.side-group{font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:14px 6px 6px;font-weight:700}
.side-item{display:flex;align-items:center;gap:9px;padding:7px 8px;border-radius:9px;text-decoration:none;color:var(--ink);font-size:13.8px;line-height:1.3}
.side-item:hover{background:var(--panel2)}
.side-item.active{background:var(--info-bg);color:var(--brand);font-weight:600}
.side-num{flex:none;width:30px;height:24px;border-radius:7px;background:var(--panel2);border:1px solid var(--line);display:grid;place-items:center;font-size:11.5px;font-weight:700;color:var(--muted)}
.side-item.active .side-num{background:var(--brand);color:#fff;border-color:transparent}
.side-done{margin-inline-start:auto;color:var(--ok);font-weight:700}

/* Home */
.hero{background:linear-gradient(135deg,#0a2a54,#0b5cad 55%,#0e7490);color:#fff;border-radius:18px;padding:30px clamp(18px,4vw,40px);box-shadow:var(--shadow);position:relative;overflow:hidden}
.hero h1{margin:0 0 6px;font-size:clamp(22px,3.2vw,34px)}
.hero p{margin:6px 0;opacity:.93;max-width:820px}
.hero .author{font-weight:600;opacity:1}
.hero-stats{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}
.stat{background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.22);border-radius:12px;padding:10px 16px;min-width:120px}
.stat b{display:block;font-size:22px}
.stat span{font-size:12.5px;opacity:.9}
.bar{height:8px;background:rgba(255,255,255,.25);border-radius:9px;overflow:hidden;margin-top:6px}
.bar > i{display:block;height:100%;background:#fbbf24}
.home-h2{margin:26px 0 12px;font-size:19px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:15px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);display:flex;flex-direction:column;gap:6px;transition:.15s}
.card:hover{transform:translateY(-2px);border-color:var(--brand)}
.card-top{display:flex;align-items:center;gap:8px;justify-content:space-between}
.chip{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;font-weight:700;padding:3px 9px;border-radius:999px;background:var(--info-bg);color:var(--info)}
.chip.ok{background:var(--ok-bg);color:var(--ok)}
.chip.warn{background:var(--warn-bg);color:var(--warn)}
.card h3{margin:2px 0 0;font-size:15.5px}
.card p{margin:0;color:var(--muted);font-size:13.3px}
.how{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.how div{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px}
.how b{display:block;margin-bottom:4px}

/* Lab */
.lab-head{display:flex;flex-wrap:wrap;align-items:flex-start;gap:12px;justify-content:space-between;margin-bottom:10px}
.lab-head h1{margin:4px 0 2px;font-size:clamp(20px,2.6vw,27px)}
.lab-meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.lab-actions{display:flex;flex-wrap:wrap;gap:6px}
.scenario{background:var(--panel);border:1px solid var(--line);border-inline-start:4px solid var(--brand);border-radius:var(--radius);padding:12px 16px;margin:8px 0 16px;color:var(--ink)}
.scenario ul{margin:6px 0 0;padding-inline-start:20px}
.lab-grid{display:grid;grid-template-columns:minmax(300px,420px) 1fr;gap:16px;align-items:start}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 16px}
.panel > h2{font-size:15px;margin:0 0 10px;display:flex;align-items:center;gap:8px;color:var(--brand)}
.inputs-panel{position:sticky;top:calc(var(--top) + 12px);max-height:calc(100vh - var(--top) - 24px);overflow:auto}
.lab-bottom{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}

/* Inputs */
.field{margin-bottom:11px;border-radius:9px;padding:2px 4px;transition:background .3s}
.field.focus{background:var(--warn-bg);box-shadow:0 0 0 2px var(--accent)}
.field > label,.field .lbl{display:flex;align-items:center;gap:6px;font-size:13.2px;font-weight:600;margin-bottom:4px}
.field input[type=text],.field input[type=number],.field select,.field textarea,.field input[type=time]{width:100%;padding:7px 10px;border:1px solid var(--line);border-radius:8px;background:var(--panel2);color:var(--ink);font:inherit;font-size:14px}
.field textarea{font-family:var(--mono);font-size:13px;min-height:80px;resize:vertical}
.field input.ltr-in,.field textarea.ltr-in{direction:ltr;text-align:left}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--brand);outline-offset:0;border-color:transparent}
.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:var(--bad);background:var(--bad-bg)}
.err{color:var(--bad);font-size:12.5px;margin-top:3px}
.hint{color:var(--muted);font-size:12px;margin-top:2px}
.range-row{display:flex;gap:8px;align-items:center}
.range-row input[type=range]{flex:1;accent-color:var(--brand)}
.range-row input[type=number]{width:90px}
.tog{display:flex;align-items:center;gap:9px;cursor:pointer;font-size:13.5px;font-weight:600}
.tog input{appearance:none;width:38px;height:21px;border-radius:21px;background:var(--line);position:relative;cursor:pointer;flex:none;transition:.2s;margin:0}
.tog input::after{content:"";position:absolute;top:2px;inset-inline-start:2px;width:17px;height:17px;border-radius:50%;background:#fff;transition:.2s;box-shadow:0 1px 2px rgba(0,0,0,.3)}
.tog input:checked{background:var(--ok)}
.tog input:checked::after{inset-inline-start:19px}
.checks{display:grid;grid-template-columns:1fr 1fr;gap:4px 10px}
.checks.one{grid-template-columns:1fr}
.checks label{display:flex;gap:6px;align-items:flex-start;font-size:13px;cursor:pointer;font-weight:400}
.checks input{accent-color:var(--brand);margin-top:3px}
.sec-h{font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:700;border-bottom:1px dashed var(--line);padding-bottom:4px;margin:16px 0 9px}
.unc{font-size:10.5px;font-weight:700;background:var(--warn-bg);color:var(--warn);border-radius:6px;padding:1px 6px;cursor:help}
.tip{cursor:help;color:var(--muted);font-weight:400;font-size:12px;border:1px solid var(--line);border-radius:50%;width:17px;height:17px;display:inline-grid;place-items:center}
.order-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.order-list li{display:flex;align-items:center;gap:6px;background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:5px 8px;font-size:13px}
.order-list li span.n{font-weight:700;color:var(--muted);width:18px}
.order-list li span.t{flex:1}
.order-list button{border:1px solid var(--line);background:var(--panel);border-radius:6px;cursor:pointer;width:26px;height:24px;color:var(--ink)}
.rating-row{display:flex;align-items:center;gap:8px;font-size:13px;padding:3px 0;border-bottom:1px dashed var(--line)}
.rating-row span{flex:1}
.rating-row .seg{display:flex;gap:2px}
.rating-row .seg button{width:28px;height:24px;border:1px solid var(--line);background:var(--panel2);border-radius:6px;cursor:pointer;font-size:12px;color:var(--ink)}
.rating-row .seg button.on{background:var(--brand);color:#fff;border-color:transparent}

/* Guided */
.guided{background:var(--warn-bg);border:1px solid var(--accent);border-radius:10px;padding:10px 12px;margin-bottom:12px}
.guided .g-h{font-weight:700;font-size:13px;color:var(--warn);display:flex;justify-content:space-between;align-items:center}
.guided p{margin:6px 0 8px;font-size:13.8px}
.guided .g-nav{display:flex;gap:6px;flex-wrap:wrap}

/* Outputs */
.out-block{margin-bottom:14px}
.out-block > h3{font-size:13.5px;margin:0 0 7px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.kv{display:grid;grid-template-columns:minmax(140px,40%) 1fr;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.kv > div{padding:7px 11px;border-bottom:1px solid var(--line);font-size:13.8px}
.kv > div:nth-last-child(-n+2){border-bottom:0}
.kv .k{background:var(--panel2);color:var(--muted);font-weight:600}
.kv .v{font-weight:600;word-break:break-word}
.s-ok{color:var(--ok)} .s-bad{color:var(--bad)} .s-warn{color:var(--warn)} .s-info{color:var(--info)}
.pill{display:inline-block;padding:1px 9px;border-radius:999px;font-size:12.5px;font-weight:700}
.pill.ok{background:var(--ok-bg);color:var(--ok)} .pill.bad{background:var(--bad-bg);color:var(--bad)} .pill.warn{background:var(--warn-bg);color:var(--warn)} .pill.info{background:var(--info-bg);color:var(--info)}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px}
table.tbl{border-collapse:collapse;width:100%;font-size:13.3px}
.tbl th,.tbl td{padding:6px 10px;border-bottom:1px solid var(--line);text-align:start;vertical-align:top}
.tbl th{background:var(--panel2);color:var(--muted);font-weight:700;font-size:12.3px;white-space:nowrap}
.tbl tr:last-child td{border-bottom:0}
.tbl tr.hit td{background:var(--warn-bg)}
.tbl tr.r-ok td:first-child{box-shadow:inset 3px 0 var(--ok)}
.tbl tr.r-bad td:first-child{box-shadow:inset 3px 0 var(--bad)}
html[dir="rtl"] .tbl tr.r-ok td:first-child{box-shadow:inset -3px 0 var(--ok)}
html[dir="rtl"] .tbl tr.r-bad td:first-child{box-shadow:inset -3px 0 var(--bad)}
pre.code{background:var(--code-bg);color:var(--code-ink);padding:11px 13px;border-radius:10px;overflow-x:auto;margin:0;direction:ltr;text-align:left;white-space:pre;line-height:1.5;font-size:12.6px}
.note{padding:9px 12px;border-radius:10px;font-size:13.6px;border:1px solid transparent;display:flex;gap:8px}
.note.ok{background:var(--ok-bg);color:var(--ok)} .note.bad{background:var(--bad-bg);color:var(--bad)} .note.warn{background:var(--warn-bg);color:var(--warn)} .note.info{background:var(--info-bg);color:var(--info)}
.note > i{font-style:normal}
.meter{display:flex;align-items:center;gap:10px}
.meter .track{flex:1;height:12px;border-radius:9px;background:var(--panel2);border:1px solid var(--line);overflow:hidden}
.meter .fill{height:100%;border-radius:9px;transition:width .3s}
.meter .fill.ok{background:var(--ok)} .meter .fill.bad{background:var(--bad)} .meter .fill.warn{background:var(--accent)} .meter .fill.info{background:var(--brand)}
.meter b{min-width:70px;text-align:end}
.flow{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.flow .node{border:1.5px solid var(--line);border-radius:9px;padding:6px 10px;font-size:12.8px;background:var(--panel2);text-align:center;min-width:80px}
.flow .node small{display:block;color:var(--muted);font-size:11px}
.flow .node.ok{border-color:var(--ok);background:var(--ok-bg)} .flow .node.bad{border-color:var(--bad);background:var(--bad-bg)} .flow .node.warn{border-color:var(--accent);background:var(--warn-bg)}
.flow .arrow{color:var(--muted);font-weight:700}
html[dir="rtl"] .flow .arrow{transform:scaleX(-1)}
.flow .arrow.bad{color:var(--bad)}
ul.olist{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:5px}
ul.olist li{display:flex;gap:8px;font-size:13.6px;align-items:flex-start}
ul.olist li i{font-style:normal;flex:none}
.heat{display:grid;grid-template-columns:28px repeat(5,1fr);gap:3px;max-width:430px;direction:ltr}
.heat .c{aspect-ratio:1.5;border-radius:6px;display:grid;place-items:center;font-size:12px;font-weight:700;color:#1f2937;position:relative}
.heat .ax{font-size:11.5px;color:var(--muted);display:grid;place-items:center;font-weight:700}
.heat .mk{position:absolute;font-size:10.5px;background:#111827;color:#fff;border-radius:6px;padding:0 5px;bottom:2px}
.heat .mk.res{background:#fff;color:#111827;border:1px solid #111827;top:2px;bottom:auto}
.heat-legend{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-top:6px}
.svgchart{width:100%;height:150px;background:var(--panel2);border:1px solid var(--line);border-radius:10px}

/* Bottom panels */
.formula{display:flex;flex-direction:column;gap:2px;padding:7px 0;border-bottom:1px dashed var(--line)}
.formula:last-child{border-bottom:0}
.formula code{font-weight:700;color:var(--brand);direction:ltr;text-align:left;unicode-bidi:isolate}
html[dir="rtl"] .formula code{text-align:right}
.formula span{font-size:13px;color:var(--muted)}
.chal{display:flex;gap:9px;align-items:flex-start;padding:7px 0;border-bottom:1px dashed var(--line);font-size:13.8px}
.chal:last-child{border-bottom:0}
.chal .box{flex:none;width:22px;height:22px;border-radius:6px;border:2px solid var(--line);display:grid;place-items:center;font-weight:700;font-size:13px}
.chal.done .box{background:var(--ok);border-color:var(--ok);color:#fff}
.chal.done span{color:var(--ok)}
.toast{position:fixed;bottom:20px;inset-inline-end:20px;background:var(--ok);color:#fff;padding:12px 18px;border-radius:12px;box-shadow:var(--shadow);z-index:60;font-weight:600;animation:pop .3s}
@keyframes pop{from{transform:translateY(20px);opacity:0}to{transform:none;opacity:1}}

.footer{border-top:1px solid var(--line);background:var(--panel);color:var(--muted);font-size:12.5px;padding:10px 18px;text-align:center}
.footer .sep{margin:0 6px}

@media (max-width:1100px){
  .lab-grid{grid-template-columns:1fr}
  .inputs-panel{position:static;max-height:none}
  .lab-bottom{grid-template-columns:1fr}
}
@media (max-width:860px){
  .only-mobile{display:inline-flex}
  .sidebar{position:fixed;top:var(--top);inset-inline-start:0;z-index:40;width:min(86vw,var(--side));transform:translateX(-110%);visibility:hidden;box-shadow:var(--shadow);height:calc(100vh - var(--top))}
  html[dir="rtl"] .sidebar{transform:translateX(110%)}
  body.nav-anim .sidebar{transition:transform .25s,visibility .25s}
  body.nav-open .sidebar{transform:none;visibility:visible}
  body.nav-open .scrim{display:block;position:fixed;inset:var(--top) 0 0 0;background:rgba(0,0,0,.35);z-index:35}
  .brand-sub{display:none}
  .kv{grid-template-columns:1fr}
  .kv .k{border-bottom:0!important;padding-bottom:2px}
  .checks{grid-template-columns:1fr}
}
@media print{
  .topbar,.sidebar,.footer,.lab-actions,.guided{display:none!important}
  .lab-grid,.lab-bottom{grid-template-columns:1fr}
  .inputs-panel{position:static;max-height:none}
  body{background:#fff}
}