:root{
  --bg:#04081a;--bg2:#070d24;--card:#0a1230;--card2:#0e1740;--border:#1b2a5e;--border2:#2a3f8f;
  --text:#eef2ff;--muted:#8f9cc7;--accent:#2f7bff;--accent2:#1f5ef0;--cyan:#3fe3ff;--purple:#8b5cf6;
  --green:#22c55e;--red:#f87171;--amber:#fbbf24;--radius:16px;--shadow:0 14px 44px rgba(0,0,0,.5);
  --input:#080f2c;--glow:0 0 24px rgba(47,123,255,.45);
  --space-section:60px;--space-section-mobile:38px;--space-card:24px;--space-content:18px;--space-inline:10px;
  --ease-spring:cubic-bezier(.22,1.2,.36,1);--ease-smooth:cubic-bezier(.4,0,.2,1);
}
[data-theme="light"]{
  --bg:#eef2fb;--bg2:#ffffff;--card:#ffffff;--card2:#eef3ff;--border:#d3ddf5;--border2:#aebfef;
  --text:#0b1530;--muted:#5a6791;--accent:#1f5ef0;--cyan:#0b7dd6;--purple:#7c3aed;
  --input:#f2f6ff;--shadow:0 10px 30px rgba(20,40,120,.12);--glow:0 0 18px rgba(47,123,255,.25);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,"Segoe UI",system-ui,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;font-size:15px;transition:background-color .25s ease,color .25s ease}
.card,#sidebar,#topbar,.btn,.iconbtn{transition-property:background-color,border-color,color,box-shadow;transition-duration:.25s;transition-timing-function:ease}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;background:radial-gradient(1100px 480px at 72% -8%,rgba(47,123,255,.16),transparent 60%),radial-gradient(800px 420px at 8% 0%,rgba(139,92,246,.1),transparent 60%),radial-gradient(700px 700px at 50% 110%,rgba(47,123,255,.07),transparent 60%)}
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.05;background-image:linear-gradient(rgba(120,160,255,.5) 1px,transparent 1px),linear-gradient(90deg,rgba(120,160,255,.5) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 30%,transparent 75%)}
#topbar,#shell,#cmd-palette,#toasts,#modal-root{position:relative;z-index:1}
a{color:var(--cyan);text-decoration:none}
h1{font-size:clamp(24px,3vw,34px);margin:.3em 0;letter-spacing:-.01em}
h2{font-size:clamp(19px,2vw,24px);margin:.3em 0}
h3{font-size:16px;margin:.4em 0}
.skip-link{position:absolute;top:-1000px;left:8px;background:var(--accent);color:#fff;padding:8px 14px;border-radius:8px;z-index:99;transition:top .15s}
.skip-link:focus{top:8px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:6px}
/* ---------- icons ---------- */
.ic{display:inline-flex;width:20px;height:20px;flex:none;color:#9fb6ff}
.ic svg{width:100%;height:100%}
.ic.sm{width:15px;height:15px}.ic.lg{width:30px;height:30px}.ic.xl{width:40px;height:40px;color:var(--accent)}
.slink.active .ic,.mainnav a.active .ic{color:var(--cyan)}
.iconbtn{display:inline-flex;align-items:center;justify-content:center;min-width:34px;height:34px;padding:0 6px;border-radius:10px;border:1px solid var(--border);background:var(--card);color:var(--text);cursor:pointer;transition:transform .15s,border-color .15s,box-shadow .15s}
.iconbtn:hover{border-color:var(--accent);box-shadow:var(--glow)}
.iconbtn:active{transform:scale(.96)}
.iconbtn.on{color:#ffd76a;border-color:#ffd76a}
.iconbtn.sm{min-width:28px;height:28px}
/* ---------- topbar ---------- */
#topbar{position:sticky;top:0;z-index:60;display:flex;align-items:center;gap:12px;padding:10px 18px;background:var(--bg2);background:color-mix(in srgb,var(--bg) 84%,transparent);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.burger{display:none}
.mainnav{display:flex;gap:2px}
.mainnav a{display:flex;align-items:center;gap:8px;padding:9px 13px;border-radius:11px;color:var(--text);font-size:14px;font-weight:600;position:relative;transition:background .18s}
.mainnav a:hover{background:rgba(47,123,255,.14)}
.mainnav a.active{color:var(--cyan)}
.mainnav a.active::after{content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--accent),var(--cyan));box-shadow:var(--glow)}
.searchbar{flex:1;min-width:140px;max-width:460px;margin-left:auto;display:flex;align-items:center;gap:8px;background:var(--input);border:1px solid var(--border);border-radius:12px;padding:7px 12px;transition:border-color .18s,box-shadow .18s}
.searchbar:focus-within{border-color:var(--accent);box-shadow:var(--glow)}
.searchbar input{flex:1;background:transparent;border:0;color:var(--text);outline:none;font-size:13.5px;min-width:0}
.sic{display:flex;color:var(--muted)}.sic .ic{width:16px;height:16px}
kbd{background:var(--card2);border:1px solid var(--border);border-radius:6px;padding:1px 7px;font-size:11px;color:var(--muted);font-family:inherit}
.top-actions{display:flex;align-items:center;gap:8px}
/* ---------- buttons ---------- */
.btn{border:1px solid var(--border);background:var(--card2);color:var(--text);padding:10px 16px;border-radius:12px;cursor:pointer;font-size:14px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:transform .15s,box-shadow .2s,border-color .15s,background .15s;font-family:inherit}
.btn:hover{border-color:var(--accent);box-shadow:var(--glow);transform:translateY(-1px)}
.btn:active{transform:scale(.98)}
.btn.primary{background:linear-gradient(135deg,#3b8bff,#1f5ef0 70%);border-color:#3b8bff;color:#fff;box-shadow:0 6px 22px rgba(47,123,255,.35)}
.btn.primary:hover{box-shadow:0 8px 30px rgba(47,123,255,.55)}
.btn.ghost{background:transparent}
.btn.small{padding:7px 12px;font-size:13px;border-radius:10px}
.btn.big{padding:13px 26px;font-size:15px;border-radius:14px}
.btn.round{border-radius:50%;width:44px;height:44px;padding:0;flex:none}
/* ---------- shell + sidebar ---------- */
#shell{display:grid;grid-template-columns:232px minmax(0,1fr);min-height:calc(100vh - 57px)}
#sidebar{border-right:1px solid var(--border);padding:14px 12px;background:var(--bg2);display:flex;flex-direction:column;gap:2px;position:sticky;top:57px;height:calc(100vh - 57px);overflow-y:auto}
.brand{display:flex;align-items:center;gap:10px;padding:4px 8px 14px;font-weight:900;letter-spacing:.05em;font-size:17px;color:var(--text)}
.brand .logo{width:36px;height:36px;flex:none;display:inline-flex}
.brand .logo svg{width:100%;height:100%;filter:drop-shadow(0 0 10px rgba(63,227,255,.5))}
.brand .bname{display:flex;flex-direction:column;line-height:1.05}
.brand .bname small{font-size:10px;letter-spacing:.34em;color:var(--cyan);font-weight:700}
.slink{display:flex;align-items:center;gap:11px;padding:9px 11px;border-radius:11px;color:var(--text);font-size:13.5px;font-weight:500;transition:background .18s,transform .18s;border:1px solid transparent;width:100%;background:transparent;cursor:pointer;font-family:inherit;text-align:start}
.slink:hover{background:rgba(47,123,255,.12)}
.slink.active{background:rgba(47,123,255,.2);border-color:var(--border)}
.slink .cnt{margin-left:auto;background:var(--card2);border:1px solid var(--border);color:var(--muted);font-size:11px;border-radius:999px;padding:1px 8px;font-weight:700}
.slink.allcats{background:linear-gradient(135deg,rgba(47,123,255,.28),rgba(139,92,246,.2));border-color:var(--border2);font-weight:700;margin-bottom:6px}
.slabel{font-size:10.5px;letter-spacing:.22em;color:var(--muted);margin:14px 8px 6px;font-weight:700}
.side-ai{margin-top:auto;padding:14px;background:linear-gradient(160deg,rgba(47,123,255,.16),rgba(139,92,246,.12));border:1px solid var(--border2)}
.side-ai .ai-ic{display:flex;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#2f7bff,#3fe3ff);color:#fff;align-items:center;justify-content:center;margin-bottom:8px;box-shadow:var(--glow)}
.side-ai p{font-size:12px;margin:6px 0 10px}
.slink.collapse{margin-top:8px;color:var(--muted)}
body.sb-min #shell{grid-template-columns:64px minmax(0,1fr)}
body.sb-min #sidebar .slink span,body.sb-min #sidebar .slink .cnt,body.sb-min #sidebar .slabel,body.sb-min .side-ai,body.sb-min .brand .bname{display:none}
body.sb-min #sidebar{align-items:center}
/* ---------- main / cards ---------- */
#main{padding:28px 28px;max-width:1480px;width:100%;margin:0 auto;min-width:0}
.card{background:var(--card);background:linear-gradient(180deg,color-mix(in srgb,var(--card2) 45%,transparent),var(--card));border:1px solid var(--border);border-radius:var(--radius);padding:var(--space-card);box-shadow:var(--shadow);animation:rise .25s ease}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.muted{color:var(--muted)}.sm{font-size:12px}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.row.wrap{flex-wrap:wrap}
.ws>*{min-width:0;min-inline-size:0}
.card{min-width:0;min-inline-size:0;overflow-wrap:anywhere}
.field input,.field select{min-width:0}
pre.resbox{white-space:pre-wrap;overflow-wrap:anywhere}
.grid{display:grid;gap:var(--space-content)}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.sechead{display:flex;align-items:end;justify-content:space-between;gap:12px;margin:var(--space-section) 0 18px}
.sechead.tight{margin:0 0 10px}
.link{font-size:13.5px;font-weight:600;white-space:nowrap}
/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border:1px solid var(--border2);border-radius:20px;background:radial-gradient(900px 380px at 68% 10%,rgba(47,123,255,.22),transparent 65%),radial-gradient(600px 300px at 15% 90%,rgba(139,92,246,.12),transparent 60%),linear-gradient(180deg,var(--card2),var(--bg2));padding:56px 44px;min-height:360px;margin-bottom:8px}
[data-theme="light"] .hero{background:radial-gradient(900px 380px at 68% 10%,rgba(47,123,255,.14),transparent 65%),radial-gradient(600px 300px at 15% 90%,rgba(139,92,246,.08),transparent 60%),linear-gradient(180deg,#ffffff,#e8efff)}
[data-theme="light"] .earth{opacity:.35}
[data-theme="light"] .stars{opacity:.12}
.stars{position:absolute;inset:0;background-image:radial-gradient(1px 1px at 12% 22%,#fff,transparent),radial-gradient(1px 1px at 32% 68%,#9fd8ff,transparent),radial-gradient(1.5px 1.5px at 55% 12%,#fff,transparent),radial-gradient(1px 1px at 78% 42%,#cfe9ff,transparent),radial-gradient(1px 1px at 88% 78%,#fff,transparent),radial-gradient(1.5px 1.5px at 42% 32%,#9fd8ff,transparent),radial-gradient(1px 1px at 66% 82%,#fff,transparent);opacity:.7}
.earth{position:absolute;right:-120px;top:-90px;width:480px;height:480px;border-radius:50%;background:radial-gradient(circle at 32% 30%,#7db9ff 0%,#2f7bff 22%,#0a2a7a 46%,#04081a 72%);box-shadow:0 0 120px 30px rgba(47,123,255,.35),inset -40px -30px 90px rgba(0,0,0,.7);opacity:.9}
.earth::after{content:"";position:absolute;inset:8%;border-radius:50%;background:radial-gradient(2px 2px at 30% 40%,#ffe9a8,transparent),radial-gradient(1.5px 1.5px at 55% 60%,#ffe9a8,transparent),radial-gradient(2px 2px at 70% 35%,#fff,transparent),radial-gradient(1.5px 1.5px at 40% 70%,#ffe9a8,transparent)}
.earth{animation:drift 14s ease-in-out infinite}
@keyframes drift{0%,100%{transform:translate(0,0)}50%{transform:translate(-14px,10px)}}
.hero{background-size:100% 100%;animation:heroBg 2s ease both}
@keyframes heroBg{from{opacity:0}to{opacity:1}}
.hero-in{position:relative;display:grid;grid-template-columns:minmax(0,1.5fr) minmax(240px,.7fr);gap:26px;align-items:start}
.badge{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--border2);border-radius:999px;padding:5px 13px;font-size:12px;color:var(--cyan);background:rgba(63,227,255,.08);font-weight:700}
.badge i{font-style:normal;color:var(--muted);font-weight:500}
.hero h1{font-size:clamp(32px,4.6vw,58px);line-height:1.04;margin:.35em 0 .25em;font-weight:800;letter-spacing:-.02em}
.hero h1 .hl{background:linear-gradient(90deg,#3b8bff,#3fe3ff);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:0 0 34px rgba(63,227,255,.35)}
.lede{color:var(--muted);max-width:56ch;font-size:15.5px}
.askbox{display:flex;gap:8px;background:var(--input);border:1px solid var(--accent);border-radius:16px;padding:7px;box-shadow:0 0 0 4px rgba(47,123,255,.14),0 0 30px rgba(47,123,255,.25);margin-top:16px;max-width:640px}
.askbox input{flex:1;background:transparent;border:0;color:var(--text);font-size:15px;outline:none;padding:10px;min-width:0;font-family:inherit}
.askbox .sic{align-self:center;margin-left:8px;color:var(--cyan)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.chip{border:1px solid var(--border2);border-radius:999px;padding:7px 14px;font-size:12.5px;background:var(--input);color:var(--text);cursor:pointer;font-family:inherit;transition:border-color .18s,transform .15s,box-shadow .18s}
.chip:hover{border-color:var(--cyan);transform:translateY(-1px);box-shadow:var(--glow)}
.hero-side{display:flex;flex-direction:column;gap:10px;border-left:1px solid var(--border);padding-left:20px}
.fcard{display:flex;gap:12px;align-items:center;background:var(--card);border:1px solid transparent;border-radius:14px;padding:10px 12px;transition:border-color .2s,transform .2s}
.fcard:hover{border-color:var(--border2);transform:translateX(-3px)}
.fcard .fic{display:flex;width:38px;height:38px;flex:none;border-radius:11px;background:linear-gradient(135deg,rgba(47,123,255,.35),rgba(139,92,246,.3));align-items:center;justify-content:center;color:#cfe3ff}
.fcard b{font-size:13px}.fcard .muted{font-size:12px}
/* ---------- category / popular / rows ---------- */
.catgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:var(--space-content)}
.ccard,.pcard{display:flex;gap:12px;align-items:flex-start;text-decoration:none;color:var(--text);transition:transform .18s,border-color .18s,box-shadow .2s}
.ccard:hover,.pcard:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--glow)}
.cic{display:flex;width:44px;height:44px;flex:none;border-radius:12px;background:linear-gradient(135deg,#2f7bff,#3fe3ff);color:#fff;align-items:center;justify-content:center;box-shadow:0 4px 16px rgba(47,123,255,.4)}
.cic .ic{color:#fff;width:22px;height:22px}
.cic.lg{width:52px;height:52px}
.ccard b,.pcard b{font-size:14px}.ccard p,.pcard p{font-size:12px;margin:4px 0}
.cnt{font-size:11.5px;color:var(--muted);border:1px solid var(--border);border-radius:999px;padding:1px 9px;background:var(--input)}
.ccard .go,.pcard .go{margin-left:auto;color:var(--cyan);align-self:center}
.popgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:var(--space-content)}
.duo{align-items:start}
.aisolver{display:flex;gap:16px;align-items:center;background:linear-gradient(140deg,rgba(47,123,255,.2),rgba(139,92,246,.14));border-color:var(--border2)}
.aisolver.big{padding:24px}
.ai-orb{display:flex;width:64px;height:64px;flex:none;border-radius:50%;background:radial-gradient(circle at 35% 30%,#3fe3ff,#2f7bff 60%,#1a2a7a);align-items:center;justify-content:center;color:#fff;box-shadow:0 0 34px rgba(63,227,255,.6);animation:pulse 3s ease-in-out infinite}
.ai-orb .ic{width:30px;height:30px;color:#fff}
@keyframes pulse{0%,100%{box-shadow:0 0 24px rgba(63,227,255,.5)}50%{box-shadow:0 0 44px rgba(63,227,255,.8)}}
.rrow{display:flex;gap:12px;align-items:center;padding:10px 4px;border-bottom:1px solid var(--border)}
.rrow:last-child{border-bottom:0}
.rrow.card{border-radius:12px;padding:12px 14px;margin-bottom:10px}
.ric{display:flex;width:38px;height:38px;flex:none;border-radius:10px;background:var(--card2);border:1px solid var(--border);align-items:center;justify-content:center}
.res{font-variant-numeric:tabular-nums;color:var(--cyan);font-weight:700}
.resbox{background:var(--input);border:1px solid var(--border);border-radius:10px;padding:12px;font-size:12.5px;overflow:auto;max-height:300px;font-variant-numeric:tabular-nums}
.cta{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:26px;background:linear-gradient(120deg,rgba(47,123,255,.22),rgba(139,92,246,.14)),var(--card);flex-wrap:wrap}
.footer{margin-top:26px;color:var(--muted);font-size:12.5px;display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.empty{text-align:center;padding:34px 16px;color:var(--muted)}
.empty.sm{padding:16px 8px}
.empty h3{color:var(--text)}
/* ---------- workspace ---------- */
.crumbs{font-size:13px;color:var(--muted);margin-bottom:8px}
.wshead{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.wshead h1{margin:0}
.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px}
.principles>div{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:10px 14px;display:flex;flex-direction:column;gap:2px;font-size:12.5px}
.principles b{font-size:12px;color:var(--cyan)}
.ws{display:grid;grid-template-columns:320px minmax(0,1fr) 330px;gap:20px;align-items:start}
/* Optional ad rail: only exists in markup when a provider is configured (or dev preview).
   Grid gains the 4th track only then; otherwise the 3-column workspace is untouched. */
body.has-ads .ws{grid-template-columns:200px 320px minmax(0,1fr) 330px}
.adrail{position:sticky;top:calc(57px + 14px);min-height:600px;max-height:calc(100vh - 90px);overflow:hidden;border:1px solid var(--border);border-radius:14px;background:var(--card);display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px 8px;color:var(--muted)}
.adrail .adbody{width:100%;flex:1;min-height:0;display:flex;align-items:center;justify-content:center}
@media(max-width:1700px){body.has-ads .ws{grid-template-columns:320px minmax(0,1fr) 330px}body.has-ads .adrail{display:none}}
.field{margin-bottom:12px}
.field label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:6px}
.field .hint{font-size:12px;color:var(--muted);margin-top:4px}
select,.field input{background:var(--input);border:1px solid var(--border);color:var(--text);border-radius:10px;padding:10px 12px;width:100%;font-size:14px;font-family:inherit;font-variant-numeric:tabular-nums}
select:focus,.field input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.err{color:#ff9aa2;font-size:12.5px;margin-top:4px}
.answer{text-align:center;background:linear-gradient(160deg,rgba(47,123,255,.18),rgba(139,92,246,.1)),var(--card);border-color:var(--border2)}
.answer .muted{letter-spacing:.14em;font-size:11.5px;font-weight:700}
.bignum{font-size:clamp(34px,4vw,52px);font-weight:800;font-variant-numeric:tabular-nums;line-height:1.1;margin:6px 0;background:linear-gradient(90deg,var(--text),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:12px;text-align:start}
.mini-grid>div{background:var(--input);border:1px solid var(--border);border-radius:10px;padding:8px 10px;font-size:12px;display:flex;flex-direction:column}
.mini-grid b{font-variant-numeric:tabular-nums;font-size:14px}
.steps{margin:8px 0;padding-left:20px;font-size:13.5px;color:var(--text)}
.steps li{margin-bottom:6px}
code{background:var(--input);border:1px solid var(--border);border-radius:8px;padding:2px 8px;font-size:13px;color:var(--cyan)}
canvas.chart{width:100%;height:230px;background:var(--input);border:1px solid var(--border);border-radius:12px}
.table-scroll{overflow:auto;max-height:420px;border:1px solid var(--border);border-radius:12px}
table.tbl{width:100%;border-collapse:collapse;font-size:13px;font-variant-numeric:tabular-nums}
table.tbl th,table.tbl td{padding:9px 10px;border-bottom:1px solid var(--border);text-align:right;white-space:nowrap}
table.tbl th:first-child,table.tbl td:first-child{text-align:left}
table.tbl th{color:var(--muted);font-weight:600;position:sticky;top:0;background:var(--card2)}
.scard{background:var(--input);border:1px solid var(--border);border-radius:10px;padding:10px 12px}
/* ---------- palette / modal / toast ---------- */
#cmd-palette{position:fixed;inset:0;background:rgba(2,4,14,.6);display:grid;place-items:start center;padding-top:12vh;z-index:80}
#cmd-palette.hidden{display:none}
.cmd-box{width:min(640px,92vw);background:var(--card);border:1px solid var(--border2);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
.cmd-box input{width:100%;padding:15px;background:transparent;border:0;color:var(--text);font-size:15px;outline:none;font-family:inherit}
.cmd-list{max-height:330px;overflow:auto}
.cmd-item{display:flex;gap:10px;align-items:center;padding:10px 14px;border-top:1px solid var(--border);cursor:pointer;font-size:14px}
.cmd-item:hover{background:rgba(47,123,255,.14)}
.mback{position:fixed;inset:0;background:rgba(2,4,14,.65);z-index:90;display:grid;place-items:center;padding:16px}
.mbox{width:min(480px,94vw)}
.mhead{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.mbody .field{margin-bottom:10px}
#toasts{position:fixed;bottom:16px;right:16px;display:flex;flex-direction:column;gap:8px;z-index:95}
.toast{background:var(--card2);border:1px solid var(--accent);padding:10px 16px;border-radius:10px;font-size:13.5px;box-shadow:var(--glow);animation:rise .2s ease}
.filterin{background:var(--input);border:1px solid var(--border);color:var(--text);border-radius:12px;padding:11px 14px;width:100%;max-width:420px;font-size:14px;font-family:inherit}
/* ---------- RTL ---------- */
[dir="rtl"] .hero-side{border-left:0;border-right:1px solid var(--border);padding-left:0;padding-right:20px}
[dir="rtl"] .fcard:hover{transform:translateX(3px)}
[dir="rtl"] table.tbl th,[dir="rtl"] table.tbl td{text-align:left}
[dir="rtl"] table.tbl th:first-child,[dir="rtl"] table.tbl td:first-child{text-align:right}
[dir="rtl"] #toasts{right:auto;left:16px}
/* ---------- responsive ---------- */
@media(max-width:1280px){.catgrid,.popgrid{grid-template-columns:repeat(3,1fr)}.ws{grid-template-columns:300px minmax(0,1fr)}.ws aside{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.ws aside .card{margin-top:0!important}}
@media(max-width:1024px){.hero-in{grid-template-columns:1fr}.hero-side{border:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr)}.earth{opacity:.5}.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:900px){
  #shell{grid-template-columns:1fr}
  #sidebar{position:fixed;inset:57px auto 0 0;width:264px;z-index:70;transform:translateX(-105%);transition:transform .22s ease;height:calc(100vh - 57px)}
  [dir="rtl"] #sidebar{inset:57px 0 0 auto;transform:translateX(105%)}
  body.nav-open #sidebar{transform:none;box-shadow:var(--shadow)}
  .burger{display:inline-flex}
  body.sb-min #shell{grid-template-columns:1fr}
  body.sb-min #sidebar .slink span,body.sb-min #sidebar .slink .cnt,body.sb-min #sidebar .slabel,body.sb-min .side-ai,body.sb-min .brand .bname{display:flex}
  .mainnav a span{display:none}
  .mainnav a{padding:9px 10px}
  .ws{grid-template-columns:1fr}.ws aside{grid-template-columns:1fr}
  .g3,.g4,.catgrid,.popgrid,.duo{grid-template-columns:1fr 1fr}
  .principles{grid-template-columns:1fr}
}
@media(max-width:600px){
  #main{padding:14px 12px}.hero{padding:24px 16px}
  .g2,.g3,.g4,.catgrid,.popgrid,.duo,.hero-side{grid-template-columns:1fr}
  #topbar{flex-wrap:wrap}.searchbar{order:5;flex-basis:100%;max-width:none}
  .mini-grid{grid-template-columns:1fr 1fr}
  .cta .btn.big{width:100%}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* ============ CINEMATIC LAYER (spacing rhythm, reveal, glow hierarchy) ============ */
.hero .hero-main>*{animation:heroIn .6s var(--ease-spring) both}
.hero .hero-main>*:nth-child(2){animation-delay:.08s}.hero .hero-main>*:nth-child(3){animation-delay:.16s}
.hero .hero-main>*:nth-child(4){animation-delay:.24s}.hero .hero-main>*:nth-child(5){animation-delay:.32s}
@keyframes heroIn{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}
.hero-side .fcard{animation:heroIn .55s var(--ease-smooth) both}
.hero-side .fcard:nth-child(2){animation-delay:.1s}.hero-side .fcard:nth-child(3){animation-delay:.18s}
.hero-side .fcard:nth-child(4){animation-delay:.26s}.hero-side .fcard:nth-child(5){animation-delay:.34s}
.reveal{opacity:0;transform:translateY(18px);transition:opacity .45s var(--ease-smooth),transform .45s var(--ease-spring)}
.reveal.vis{opacity:1;transform:none}
.catgrid .ccard:nth-child(2),.popgrid .pcard:nth-child(2){transition-delay:.05s}
.catgrid .ccard:nth-child(3),.popgrid .pcard:nth-child(3){transition-delay:.1s}
.catgrid .ccard:nth-child(4),.popgrid .pcard:nth-child(4){transition-delay:.15s}
.catgrid .ccard:nth-child(5),.popgrid .pcard:nth-child(5){transition-delay:.2s}
.ccard .cic,.pcard .cic{transition:transform .25s var(--ease-spring),box-shadow .25s}
.ccard:hover .cic,.pcard:hover .cic{transform:scale(1.08) rotate(-4deg)}
.ccard .go,.pcard .go{transition:transform .2s var(--ease-spring)}
.ccard:hover .go,.pcard:hover .go{transform:translateX(4px)}
[dir="rtl"] .ccard:hover .go,[dir="rtl"] .pcard:hover .go{transform:translateX(-4px)}
.slink{transition:background .18s,transform .18s,border-color .18s}
.slink:hover{transform:translateX(2px)}
[dir="rtl"] .slink:hover{transform:translateX(-2px)}
.btn{transition:transform .15s var(--ease-spring),box-shadow .25s,border-color .15s,background .2s}
.expmenu{display:flex;flex-direction:column;gap:6px;margin-top:8px;background:var(--input);border:1px solid var(--border2);border-radius:12px;padding:8px;animation:menuIn .2s var(--ease-spring)}
.expmenu.hidden{display:none}
.expmenu button{display:flex;align-items:center;gap:10px;background:transparent;border:0;color:var(--text);padding:10px 12px;border-radius:9px;cursor:pointer;font-size:13.5px;font-family:inherit;text-align:start;transition:background .15s}
.expmenu button:hover{background:rgba(47,123,255,.16)}
@keyframes menuIn{from{opacity:0;transform:translateY(-6px) scale(.98)}to{opacity:1;transform:none}}
.prog{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.prog li{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:14px}
.prog li::before{content:"";width:16px;height:16px;border-radius:50%;border:2px solid var(--border2);flex:none}
.prog li.done{color:var(--text)}
.prog li.done::before{border-color:var(--green);background:var(--green);box-shadow:0 0 10px rgba(34,197,94,.6)}
.prog li:not(.done)::before{border-top-color:var(--cyan);animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.rrow{transition:background .18s,transform .18s}
.rrow:hover{background:rgba(47,123,255,.07)}
.iconbtn{transition:transform .15s var(--ease-spring),border-color .15s,box-shadow .2s,color .15s}
.iconbtn:hover{transform:translateY(-1px)}
.iconbtn:active{transform:scale(.94)}
.iconbtn.on{animation:pop .3s var(--ease-spring)}
@keyframes pop{0%{transform:scale(.7)}60%{transform:scale(1.15)}100%{transform:scale(1)}}
.askbox{transition:box-shadow .25s,border-color .2s}
.askbox:hover{box-shadow:0 0 0 4px rgba(47,123,255,.2),0 0 40px rgba(47,123,255,.35)}
.cmd-box{animation:menuIn .22s var(--ease-spring)}
.mbox{animation:menuIn .25s var(--ease-spring)}
.toast{animation:menuIn .25s var(--ease-spring)}
.bignum{transition:color .3s}
canvas.chart{transition:opacity .3s}
@media(max-width:900px){:root{--space-section:var(--space-section-mobile)}#main{padding:18px 14px}.hero{padding:36px 22px}}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}.hero .hero-main>*,.hero-side .fcard{animation:none}}
/* ============ WORKSPACE: feedback + conditional sections ============ */
.fbrow{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}
.fsec{border:1px solid var(--border);border-radius:12px;margin-bottom:10px;background:var(--input)}
.fsec summary{cursor:pointer;padding:11px 14px;font-weight:700;font-size:13.5px;list-style:none;display:flex;align-items:center;gap:8px}
.fsec summary::-webkit-details-marker{display:none}
.fsec summary::before{content:"+";color:var(--cyan);font-weight:800}
.fsec[open] summary::before{content:"–"}
.fsec summary:hover{color:var(--cyan)}
.fsec .field{margin:0 14px 12px}
/* ============ SITE: footer, prose, articles, ads ============ */
.sitefoot{margin-top:var(--space-section);border:1px solid var(--border);border-radius:20px;padding:28px;background:linear-gradient(180deg,rgba(14,23,64,.7),rgba(6,10,28,.9))}
.footgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr 1fr;gap:18px}
.footgrid>div{display:flex;flex-direction:column;gap:7px;font-size:13px}
.footgrid b{font-size:12px;letter-spacing:.08em;color:var(--muted);text-transform:uppercase}
.footgrid a{color:var(--text);opacity:.85}
.footgrid a:hover{color:var(--cyan);opacity:1}
.fbrand{display:flex;gap:12px;align-items:flex-start}
.fbrand .logo{width:40px;height:40px;flex:none}.fbrand .logo svg{width:100%;height:100%}
.fbrand b{display:flex;flex-direction:column;line-height:1.1;font-size:15px}
.fbrand b small{font-size:9px;letter-spacing:.3em;color:var(--cyan)}
.footbase{display:flex;gap:16px;flex-wrap:wrap;align-items:center;margin-top:20px;padding-top:14px;border-top:1px solid var(--border);font-size:12px;color:var(--muted)}
.footbase a{color:var(--muted)}
.prose{line-height:1.7;font-size:14.5px}
.prose h2{margin-top:22px;color:var(--cyan);font-size:17px}
.prose p{color:var(--text);margin:8px 0}
.prose ul{color:var(--text)}
.hero.slim{min-height:0;padding:36px 34px}
.card.toc ol{margin:6px 0;padding-left:20px;font-size:13.5px}
.artcard h3{margin:.3em 0}
.adslot{border:1px dashed var(--border2);border-radius:14px;background:var(--card);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:var(--muted);text-align:center}
.adslot.leader{min-height:96px;margin:var(--space-content) 0}
.adslot.box{min-height:250px;margin-top:12px}
.adlabel{font-size:10px;letter-spacing:.2em;text-transform:uppercase;opacity:.7}
.adempty{font-size:12px}
.brand{animation:brandIn .7s var(--ease-spring) both}
@keyframes brandIn{from{opacity:0;transform:translateX(-12px)}to{opacity:1;transform:none}}
@media(max-width:1024px){.footgrid{grid-template-columns:1fr 1fr 1fr}}
@media(max-width:900px){.adslot.box{display:none}}
@media(max-width:600px){.footgrid{grid-template-columns:1fr 1fr}.adslot.leader{min-height:72px}}
/* ============ UNIVERSAL CALCULATOR ============ */
.uni-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,.8fr);gap:20px;align-items:start}
.udisplay{background:var(--input);border:1px solid var(--border2);border-radius:14px;padding:14px;margin:12px 0}
.udisplay input{width:100%;background:transparent;border:0;color:var(--text);font-size:22px;font-weight:700;outline:none;font-family:ui-monospace,Consolas,monospace;direction:ltr;text-align:right;padding:4px 2px;font-variant-numeric:tabular-nums}
.ures{margin-top:6px;min-height:44px}
.bignum.sm{font-size:clamp(24px,3vw,34px)}
.kpad{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.kbtn{border:1px solid var(--border);background:var(--card2);color:var(--text);border-radius:12px;padding:13px 4px;font-size:15px;font-weight:700;cursor:pointer;font-family:inherit;transition:transform .12s,border-color .15s,box-shadow .15s;min-height:48px}
.kbtn:hover{border-color:var(--accent)}
.kbtn:active{transform:scale(.95)}
.kbtn.primary{background:linear-gradient(135deg,#3b8bff,#1f5ef0);border-color:#3b8bff;color:#fff}
.kbtn.danger{color:#ff9aa2}
.chip.on{background:rgba(47,123,255,.28);border-color:var(--accent);color:#fff}
.slink.uni{background:linear-gradient(135deg,rgba(63,227,255,.14),rgba(139,92,246,.12));border-color:var(--border2);font-weight:700;margin-bottom:6px}
.uni-promo{border-color:var(--border2);background:linear-gradient(120deg,rgba(47,123,255,.16),rgba(139,92,246,.1))}
@media(max-width:900px){.uni-grid{grid-template-columns:1fr}.kbtn{min-height:52px;font-size:16px}}