/* Inner Revolution · AI Library lesson: Safe AI for Your Business (preview) */
#irb{
  --bg:#070b18; --navy:#0a0f22; --gold:#D4A853; --gold-l:#f3d58e; --gold-soft:rgba(212,168,83,.55); --gold-faint:rgba(212,168,83,.12);
  --copper:#eba184; --ink:rgba(253,252,249,.93); --ink-soft:rgba(253,252,249,.76); --ink-faint:rgba(253,252,249,.55);
  --glass:rgba(20,26,56,.62); --line:rgba(212,168,83,.22);
  --green:#7fd1a4; --yellow:#f2d06b; --orange:#f0a37a; --red:#ef7f86;
  --display:'Cormorant Garamond',Georgia,'Times New Roman',serif; --body:'DM Sans',system-ui,-apple-system,'Segoe UI',sans-serif;
  color-scheme:dark;
}
#irb *{box-sizing:border-box}
#irb{overflow-x:clip}
#irb{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.75;overflow-x:hidden}
#irb #sky{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
#irb .wrap{position:relative;z-index:1;max-width:880px;margin:0 auto;padding:46px max(16px,env(safe-area-inset-left)) 120px max(16px,env(safe-area-inset-right))}
#irb .metal{font-style:italic;background:linear-gradient(100deg,#a8792c 0%,#d4a853 25%,#f6dc95 42%,#fff3c4 50%,#d9ad55 62%,#a8792c 100%);background-size:250% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:sweep 8s ease-in-out infinite alternate}
@keyframes sweep{from{background-position:120% 0}to{background-position:-20% 0}}
#irb h1{font-family:var(--display);font-weight:300;font-size:clamp(46px,8vw,84px);line-height:1.02;margin:14px 0 20px;text-wrap:balance}
#irb h2{font-family:var(--display);font-weight:300;font-size:clamp(34px,5vw,48px);line-height:1.12;margin:0 0 14px;text-wrap:balance}
#irb h2 em,#irb h1 em:not(.metal){font-style:italic;color:var(--gold)}
#irb h3{font-family:var(--display);font-weight:400;font-size:26px;line-height:1.2;margin:0 0 6px}
#irb p{margin:0 0 14px;max-width:66ch}
#irb .kicker{font-size:12.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--gold);font-weight:500}
#irb .simple{font-size:20px;color:var(--ink-soft)}
#irb .note{font-size:14.5px;color:var(--ink-faint)}
#irb section{margin-top:84px}
#irb .label{display:flex;align-items:center;gap:10px;font-size:12.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--gold);font-weight:500;margin-bottom:12px}
#irb .label i{font-style:normal;font-size:18px}
#irb .glass{background:var(--glass);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-radius:24px;box-shadow:0 18px 50px rgba(0,0,0,.35),inset 0 1px 0 rgba(255,255,255,.05);position:relative;padding:28px;margin-top:22px}
#irb .glass::before{content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);width:44%;height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent)}
#irb .center{text-align:center}
#irb .chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
#irb .chip{font:500 12.5px var(--body);letter-spacing:.12em;text-transform:uppercase;padding:8px 15px;border-radius:999px;border:1px solid var(--line);color:var(--ink-soft);background:transparent;text-decoration:none}
#irb .btn{cursor:pointer;background:transparent;border:1px solid var(--gold-soft);color:var(--gold);border-radius:999px;padding:11px 22px;font:600 12.5px var(--body);letter-spacing:.14em;text-transform:uppercase;transition:background .3s}
#irb .btn:hover{background:var(--gold-faint)}
#irb .gold-btn{cursor:pointer;border:none;padding:14px 28px;border-radius:999px;font:600 12.5px var(--body);letter-spacing:.15em;text-transform:uppercase;color:#2a1d07;background:linear-gradient(100deg,#a8792c,#e8c46e 40%,#fff0b8 50%,#d9ad55 62%,#b7862f);background-size:200% 100%;transition:background-position .6s,transform .25s;box-shadow:0 10px 30px rgba(212,168,83,.25)}
#irb .gold-btn:hover{background-position:100% 0;transform:translateY(-2px)}
#irb button:focus-visible,#irb label:focus-within,#irb .term:focus-visible,#irb .flip:focus-visible,#irb .door:focus-visible{outline:2px solid var(--gold);outline-offset:3px}

/* copper words */
#irb .term{position:relative;cursor:pointer;color:#eba184;background:linear-gradient(100deg,#f5bfa6,#d07f5c 35%,#94482f 55%,#d07f5c 75%,#f5bfa6);background-size:200% 100%;-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;border-bottom:2px dotted rgba(208,127,92,.85)}
#irb .term .tip{position:absolute;left:50%;bottom:calc(100% + 10px);transform:translateX(-50%) translateY(6px);width:min(280px,80vw);padding:14px 16px;border-radius:14px;background:rgba(14,19,42,.97);border:1px solid rgba(208,127,92,.6);box-shadow:0 14px 40px rgba(0,0,0,.5);font:400 14.5px/1.6 var(--body);-webkit-text-fill-color:rgba(253,252,249,.93);color:rgba(253,252,249,.93);display:none;z-index:20;text-align:left;animation:tipIn .25s ease}
#irb .term.open .tip{display:block}
@keyframes tipIn{from{opacity:0;margin-bottom:-6px}to{opacity:1;margin-bottom:0}}

/* keys collected */
#irb .keys{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:30;display:flex;align-items:center;gap:12px;padding:10px 18px;border-radius:999px;background:rgba(10,15,34,.88);border:1px solid var(--line);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:0 12px 34px rgba(0,0,0,.45);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft)}
#irb .keys .row{display:flex;gap:5px}
#irb .keys .k{width:18px;height:18px;opacity:.22;transition:opacity .5s,transform .5s,filter .5s}
#irb .keys .k.on{opacity:1;filter:drop-shadow(0 0 6px rgba(246,220,149,.9));transform:scale(1.12)}
#irb .keys b{color:var(--gold);font-weight:600;white-space:nowrap}
#irb .toast{position:fixed;left:50%;bottom:76px;transform:translateX(-50%) translateY(20px);z-index:31;padding:12px 22px;border-radius:999px;background:linear-gradient(100deg,#a8792c,#e8c46e 45%,#fff0b8 55%,#d9ad55);color:#2a1d07;font:600 13px var(--body);letter-spacing:.1em;text-transform:uppercase;opacity:0;transition:opacity .4s,transform .4s;pointer-events:none;white-space:nowrap}
#irb .toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* 0 · boundaries you already know */
#irb .bks{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:24px}
#irb .bk{cursor:pointer;display:grid;text-align:left;font:inherit;color:inherit;padding:0;border:1px solid var(--line);border-radius:20px;background:linear-gradient(160deg,rgba(28,36,80,.7),rgba(10,15,34,.75));overflow:hidden;transition:border-color .5s,box-shadow .5s;position:relative}
#irb .bk:last-child{grid-column:1/-1}
#irb .bk>.side{grid-area:1/1;padding:22px 22px 46px;transition:opacity .6s ease,transform .6s ease}
#irb .bk .ai{opacity:0;transform:translateY(12px);pointer-events:none;background:linear-gradient(160deg,rgba(60,46,20,.45),rgba(10,15,34,.2))}
#irb .bk.on{border-color:var(--gold-soft);box-shadow:0 0 30px rgba(212,168,83,.14)}
#irb .bk.on .hu{opacity:0;transform:translateY(-12px)}
#irb .bk.on .ai{opacity:1;transform:none}
#irb .bk .ic{font-size:30px;display:block;margin-bottom:8px}
#irb .bk .tg{display:block;font-size:12.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--copper);margin-bottom:4px}
#irb .bk .ai .tg{color:var(--gold)}
#irb .bk h3{font-size:24px;margin:0 0 8px}
#irb .bk p{font-size:15.5px;line-height:1.65;color:var(--ink-soft);margin:0}
#irb .bk .turn{position:absolute;right:16px;bottom:14px;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint);transition:color .4s}
#irb .bk.on .turn{color:var(--gold)}
/* 1 · power slider */
#irb .power{margin-top:8px}
#irb .ptrack{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:20px}
#irb .pstep{cursor:pointer;border:1px solid var(--line);background:transparent;color:var(--ink-soft);border-radius:16px;padding:14px 8px;font:500 14px var(--body);text-align:center;transition:all .35s}
#irb .pstep span{display:block;font-size:24px;margin-bottom:4px}
#irb .pstep[aria-pressed="true"]{color:var(--ink);border-color:var(--gold-soft);background:var(--gold-faint)}
#irb .pmeter{height:10px;border-radius:99px;background:rgba(255,255,255,.07);overflow:hidden;margin:22px 0 10px}
#irb .pmeter i{display:block;height:100%;width:25%;border-radius:99px;background:var(--green);transition:width .6s,background .6s}
#irb .pout{min-height:84px;font-size:16px;color:var(--ink-soft)}
#irb .pout b{color:var(--ink)}

/* 2 · three ideas, three little worlds */
#irb .ideas-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:22px}
#irb .inav{cursor:pointer;text-align:left;border:1px solid var(--line);background:rgba(255,255,255,.02);color:var(--ink-soft);border-radius:18px;padding:14px 16px;font:400 14px/1.4 var(--body);transition:all .35s;position:relative}
#irb .inav b{display:block;font-family:var(--display);font-weight:400;font-size:21px;line-height:1.15;color:var(--ink);margin-top:4px}
#irb .inav .no{font-size:12.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--gold)}
#irb .inav[aria-selected="true"]{border-color:var(--gold-soft);background:linear-gradient(160deg,rgba(212,168,83,.14),rgba(212,168,83,.03));box-shadow:0 0 30px rgba(212,168,83,.12)}
#irb .inav.done::after{content:"✓";position:absolute;right:14px;top:12px;color:var(--green);font-weight:600}
#irb .scene{display:none}#irb .scene.on{display:block;animation:sceneIn .6s ease}
@keyframes sceneIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
#irb .scene h3{font-size:clamp(28px,4vw,36px);font-weight:300;text-align:center;margin:0 0 6px}
#irb .scene h3 em{font-style:italic;color:var(--gold)}
#irb .scene .sub{text-align:center;color:var(--ink-soft);margin:0 auto 22px;font-size:15.5px}
#irb .choices{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-bottom:24px}
#irb .choice{cursor:pointer;border:1px solid var(--line);background:rgba(10,15,34,.5);color:var(--ink-soft);border-radius:999px;padding:9px 16px;font:500 14px var(--body);transition:all .3s}
#irb .choice:hover,#irb .choice.on{border-color:var(--gold-soft);color:var(--gold);background:var(--gold-faint)}
#irb .choice[disabled]{opacity:.5;cursor:default}
/* scene 1: the flow */
#irb .flow{position:relative;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
#irb .flow .wire{position:absolute;left:16%;right:16%;top:44px;height:2px;background:rgba(212,168,83,.18);border-radius:2px}
#irb .flow .spark{position:absolute;top:39px;left:16%;width:12px;height:12px;margin-left:-6px;border-radius:50%;background:#fff3d6;box-shadow:0 0 12px #ffe2a6,0 0 26px rgba(212,168,83,.8);opacity:0}
#irb .node{position:relative;text-align:center}
#irb .node .orb{position:relative;z-index:1;width:88px;height:88px;margin:0 auto 12px;border-radius:50%;display:grid;place-items:center;font-size:34px;background:radial-gradient(circle at 40% 35%,rgba(40,50,100,.95),rgba(10,15,34,.95));border:1px solid var(--line);transition:all .5s}
#irb .node.lit .orb{border-color:var(--gold);box-shadow:0 0 0 6px rgba(212,168,83,.1),0 0 34px rgba(212,168,83,.45)}
#irb .node.stop .orb{border-color:var(--red);box-shadow:0 0 0 6px rgba(239,127,134,.1),0 0 30px rgba(239,127,134,.4)}
#irb .node .role{font-size:12.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);font-weight:600}
#irb .node .who{font-family:var(--display);font-size:21px;color:var(--ink);margin:2px 0 8px}
#irb .node .say{min-height:86px;font-size:14.5px;line-height:1.55;color:var(--ink-faint);padding:12px 12px;border-radius:14px;border:1px dashed rgba(212,168,83,.18);transition:all .5s}
#irb .node.lit .say{color:var(--ink);border-style:solid;border-color:rgba(212,168,83,.35);background:rgba(212,168,83,.06)}
#irb .node.stop .say{color:var(--ink);border-style:solid;border-color:rgba(239,127,134,.5);background:rgba(239,127,134,.07)}
#irb .receipt{font-family:ui-monospace,Menlo,monospace;font-size:13px;line-height:1.5;text-align:left}
#irb .approve{display:none;gap:8px;justify-content:center;margin-top:10px}#irb .approve.show{display:flex}
#irb .approve button{cursor:pointer;border-radius:999px;padding:7px 16px;font:600 12.5px var(--body);letter-spacing:.1em;text-transform:uppercase;border:1px solid}
#irb .approve .yes{color:#2a1d07;background:var(--gold);border-color:var(--gold)}#irb .approve .no{color:var(--ink-soft);background:transparent;border-color:var(--line)}
/* scene 2: wish vs lock */
#irb .duo{display:grid;grid-template-columns:1fr 1fr;gap:16px}
#irb .lane{position:relative;border-radius:20px;border:1px solid var(--line);background:rgba(10,15,34,.45);padding:18px 18px 20px;overflow:hidden}
#irb .lane .lt{font-size:12.5px;letter-spacing:.2em;text-transform:uppercase;font-weight:600;color:var(--gold);text-align:center}
#irb .lane .ld{font-family:var(--display);font-size:22px;text-align:center;color:var(--ink);margin:2px 0 14px}
#irb .bubble2{margin:0 auto 14px;max-width:250px;padding:10px 14px;border-radius:16px 16px 16px 4px;background:rgba(253,252,249,.08);border:1px solid rgba(253,252,249,.15);font-size:14px;color:var(--ink-soft);text-align:center}
#irb .track{position:relative;height:110px;border-radius:16px;background:linear-gradient(90deg,rgba(255,255,255,.02),rgba(255,255,255,.05));border:1px solid rgba(212,168,83,.12)}
#irb .bot{position:absolute;left:12px;top:50%;width:46px;height:46px;margin-top:-23px;display:grid;place-items:center;font-size:28px;transition:left 1.4s cubic-bezier(.5,.1,.3,1),transform .3s;z-index:2}
#irb .vault{position:absolute;right:12px;top:50%;width:70px;height:84px;margin-top:-42px;border-radius:12px 12px 6px 6px;border:1px solid rgba(212,168,83,.4);background:linear-gradient(180deg,rgba(40,32,18,.7),rgba(14,18,40,.9));display:grid;place-items:center;font-size:28px;transition:all .5s}
#irb .vault .lk{position:absolute;left:-14px;top:50%;margin-top:-16px;font-size:24px;filter:drop-shadow(0 0 8px rgba(246,220,149,.8))}
#irb .lane.robbed .vault{border-color:var(--red);box-shadow:0 0 26px rgba(239,127,134,.45)}
#irb .lane.held .vault{border-color:var(--green);box-shadow:0 0 26px rgba(127,209,164,.35)}
#irb .lane .res{min-height:52px;margin-top:14px;text-align:center;font-size:14.5px;color:var(--ink-soft)}
#irb .lane.robbed .res b{color:var(--red)}#irb .lane.held .res b{color:var(--green)}
#irb .bump{animation:bump .5s ease}
@keyframes bump{0%,100%{transform:translateX(0)}40%{transform:translateX(-14px) rotate(-8deg)}70%{transform:translateX(4px)}}
/* scene 3: layers */
#irb .layers{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-bottom:18px}
#irb .ly{cursor:pointer;display:flex;align-items:center;gap:8px;border:1px solid var(--line);background:rgba(10,15,34,.5);color:var(--ink-faint);border-radius:999px;padding:8px 14px 8px 10px;font:500 14px var(--body);transition:all .3s}
#irb .ly span{font-size:18px;opacity:.4;transition:opacity .3s}
#irb .ly[aria-pressed="true"]{color:var(--ink);border-color:var(--gold-soft);background:var(--gold-faint)}#irb .ly[aria-pressed="true"] span{opacity:1}
#irb .field{position:relative;height:150px;border-radius:18px;background:linear-gradient(90deg,rgba(239,127,134,.06),rgba(255,255,255,.02) 40%,rgba(127,209,164,.06));border:1px solid rgba(212,168,83,.14);overflow:hidden}
#irb .field .src,#irb .field .home{position:absolute;top:50%;transform:translateY(-50%);font-size:34px}
#irb .field .src{left:14px}#irb .field .home{right:14px;filter:drop-shadow(0 0 10px rgba(212,168,83,.5))}
#irb .wall{position:absolute;top:14px;bottom:14px;width:46px;margin-left:-23px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;border-radius:12px;font-size:22px;transition:all .4s;opacity:.12}
#irb .wall i{font-style:normal;font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint)}
#irb .wall.on{opacity:1;background:rgba(212,168,83,.07);border:1px solid rgba(212,168,83,.3)}
#irb .wall.hold{background:rgba(127,209,164,.14);border-color:var(--green);box-shadow:0 0 22px rgba(127,209,164,.35)}
#irb .wall.miss{background:rgba(239,127,134,.1);border-color:rgba(239,127,134,.6)}
#irb .bolt{position:absolute;top:50%;left:60px;width:16px;height:16px;margin:-8px 0 0 -8px;border-radius:50%;background:#ffb4a2;box-shadow:0 0 12px #ff8f7a,0 0 26px rgba(239,127,134,.7);opacity:0}
#irb .stats{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}
#irb .stat{text-align:center;padding:14px;border-radius:14px;border:1px solid var(--line);background:rgba(255,255,255,.02)}
#irb .stat b{display:block;font-family:var(--display);font-size:38px;font-weight:400;line-height:1;color:var(--gold)}
#irb .stat span{font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint)}
#irb .lyline{margin-top:14px;text-align:center;font-size:15px;color:var(--ink-soft);min-height:48px}
#irb .lyline b{color:var(--ink)}
#irb .truth{margin-top:24px;text-align:center;font-family:var(--display);font-size:clamp(22px,3.2vw,28px);line-height:1.35;color:var(--ink)}
#irb .truth em{font-style:italic;color:var(--gold)}
/* 3 · house of doors */
#irb .task{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint)}
#irb .taskcard{margin:14px 0 18px;padding:20px;border-radius:18px;border:1px solid var(--gold-soft);background:rgba(212,168,83,.06);text-align:center;font-family:var(--display);font-size:clamp(23px,3.6vw,29px);line-height:1.3}
#irb .house{position:relative;margin:0 auto;max-width:560px}
#irb .roof{height:70px;margin:0 6%;background:linear-gradient(180deg,rgba(212,168,83,.14),rgba(212,168,83,.04));clip-path:polygon(50% 0,100% 100%,0 100%);position:relative}
#irb .roof:after{content:"🤖";position:absolute;left:50%;top:30px;transform:translateX(-50%);font-size:24px}
#irb .rooms{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:14px;border:1px solid var(--line);border-top:0;border-radius:0 0 20px 20px;background:rgba(255,255,255,.02)}
#irb .door{cursor:pointer;position:relative;border:1px solid var(--line);background:rgba(10,15,34,.6);color:var(--ink-soft);border-radius:14px 14px 6px 6px;padding:16px 6px 12px;font:500 14px var(--body);text-align:center;transition:all .35s}
#irb .door span{display:block;font-size:26px;margin-bottom:4px;transition:transform .35s}
#irb .door em{display:block;font-style:normal;font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;margin-top:6px;color:var(--ink-faint)}
#irb .door.open{border-color:var(--gold-soft);background:rgba(212,168,83,.1);color:var(--ink)}
#irb .door.open span{transform:scale(1.15)}
#irb .door.open em{color:var(--gold)}
#irb .door.good{border-color:var(--green);box-shadow:0 0 18px rgba(127,209,164,.25)}
#irb .door.bad{border-color:var(--red);box-shadow:0 0 18px rgba(239,127,134,.25)}
#irb .feedback{margin-top:16px;padding:16px 18px;border-radius:14px;background:rgba(255,255,255,.04);font-size:15.5px;color:var(--ink-soft)}
#irb .feedback b{color:var(--ink)}
#irb .gfoot{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap;margin-top:14px}

/* 4 · rules */
#irb .tabs{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
#irb .tab{cursor:pointer;border:1px solid var(--line);background:transparent;color:var(--ink-soft);border-radius:999px;padding:9px 16px;font:500 14px var(--body);transition:all .3s}
#irb .tab[aria-selected="true"]{background:var(--gold-faint);color:var(--gold);border-color:var(--gold-soft)}
#irb .tab.seen:not([aria-selected="true"])::after{content:" ✓";color:var(--green)}
#irb .rules{display:grid;gap:10px}
#irb .rule{border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.02);overflow:hidden}
#irb .rule button{all:unset;box-sizing:border-box;cursor:pointer;display:flex;gap:14px;align-items:center;width:100%;padding:16px 18px;font-weight:500}
#irb .rule .n{flex:none;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-size:13px;border:1px solid var(--gold-soft);color:var(--gold)}
#irb .rule .t{flex:1;min-width:0}
#irb .rule .plus{color:var(--gold);transition:transform .3s}
#irb .rule.open .plus{transform:rotate(45deg)}
#irb .rule .body{padding:0 18px 16px 62px;color:var(--ink-soft);font-size:15.5px}
#irb .rule .body p{margin:0}
#irb .remember{margin-top:26px;padding:22px 24px;border-radius:18px;border:1px solid var(--gold-soft);background:linear-gradient(120deg,rgba(212,168,83,.1),rgba(212,168,83,.02));display:flex;gap:14px;align-items:flex-start}
#irb .remember .ic{font-size:24px;line-height:1}
#irb .remember b{display:block;font-size:12.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);font-weight:600;margin-bottom:4px}
#irb .remember p{margin:0;font-family:var(--display);font-size:22px;line-height:1.4;color:var(--ink)}

/* 5 · sort game */
#irb .ladder{display:grid;gap:10px;margin-top:20px}
#irb .rung{display:grid;grid-template-columns:110px 1fr;gap:16px;padding:14px 18px;border-radius:16px;border:1px solid var(--line);background:rgba(255,255,255,.02)}
#irb .rung .lvl{display:flex;align-items:center;gap:8px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;font-size:13px}
#irb .dot{width:12px;height:12px;border-radius:50%;flex:none}
#irb .g .dot{background:var(--green)}#irb .y .dot{background:var(--yellow)}#irb .o .dot{background:var(--orange)}#irb .r .dot{background:var(--red)}
#irb .g .lvl{color:var(--green)}#irb .y .lvl{color:var(--yellow)}#irb .o .lvl{color:var(--orange)}#irb .r .lvl{color:var(--red)}
#irb .rung .what{font-size:15.5px;color:var(--ink-soft)}#irb .rung .what strong{color:var(--ink);font-weight:500}
#irb .gtop{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint)}
#irb .streak{color:var(--gold)}
#irb .card{margin:16px 0;padding:28px 22px;border-radius:18px;border:1px solid var(--gold-soft);background:rgba(212,168,83,.06);text-align:center;transition:transform .35s,opacity .35s}
#irb .card.out{transform:translateY(-14px) scale(.97);opacity:0}
#irb .card .job{font-family:var(--display);font-size:clamp(24px,4vw,31px);line-height:1.25}
#irb .picks{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
#irb .pick{cursor:pointer;border-radius:14px;padding:13px 8px;font:600 13px var(--body);letter-spacing:.08em;text-transform:uppercase;background:transparent;border:1px solid;transition:transform .2s,background .2s}
#irb .pick:hover{transform:translateY(-2px)}
#irb .pick.g{color:var(--green);border-color:var(--green)}#irb .pick.y{color:var(--yellow);border-color:var(--yellow)}#irb .pick.o{color:var(--orange);border-color:var(--orange)}#irb .pick.r{color:var(--red);border-color:var(--red)}
#irb .pick[disabled]{cursor:default;opacity:.4;transform:none}
#irb .pick.chosen{opacity:1;background:rgba(255,255,255,.07)}

/* 6 · injection lab */
#irb .msgs{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 16px}
#irb .lab{display:grid;grid-template-columns:1.15fr .85fr;gap:18px}
#irb .mail{border-radius:16px;background:#f7f4ec;color:#2b2a26;padding:18px 20px;font-size:15px;line-height:1.65;min-width:0}
#irb .mail .hdr{font-size:13px;color:#6b665a;border-bottom:1px solid #e3ddcf;padding-bottom:8px;margin-bottom:10px}
#irb .mail .ln{display:block;cursor:pointer;border-radius:6px;padding:2px 6px;margin:0 -6px;transition:background .3s,color .3s}
#irb .mail .ln:hover{background:#efe9da}
#irb .mail .ln.hid{color:#f7f4ec}
#irb .mail .ln.wrong{background:#f3e6c7}
#irb .mail.found .ln.hid,#irb .mail.reveal .ln.hid{color:#9a2d2d;background:#fbe3e3}
#irb .spot{font-size:14.5px;color:var(--ink-soft);margin:0 0 10px}
#irb .controls{display:grid;gap:12px;align-content:start;min-width:0}
#irb .toggle{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 16px;border-radius:14px;border:1px solid var(--line);background:rgba(255,255,255,.02);cursor:pointer;font-size:15px;position:relative}
#irb .toggle input{position:absolute;opacity:0;pointer-events:none}
#irb .sw{flex:none;width:44px;height:24px;border-radius:99px;background:rgba(255,255,255,.12);position:relative;transition:background .3s}
#irb .sw::after{content:'';position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:50%;background:var(--ink);transition:transform .3s}
#irb .toggle input:checked+.sw{background:var(--gold)}
#irb .toggle input:checked+.sw::after{transform:translateX(20px);background:#2a1d07}
#irb .outcome{margin-top:18px;padding:18px 20px;border-radius:16px;border:1px solid var(--line);font-size:16px}
#irb .outcome.safe{border-color:var(--green);background:rgba(127,209,164,.07)}
#irb .outcome.ask{border-color:var(--yellow);background:rgba(242,208,107,.07)}
#irb .outcome.bad{border-color:var(--orange);background:rgba(240,163,122,.07)}
#irb .outcome .ol{font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;font-weight:600;margin-bottom:6px}
#irb .outcome.safe .ol{color:var(--green)}#irb .outcome.ask .ol{color:var(--yellow)}#irb .outcome.bad .ol{color:var(--orange)}
#irb .combo{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-top:20px;font-size:14.5px}
#irb .combo span{padding:10px 16px;border-radius:999px;border:1px solid var(--line)}
#irb .combo b{color:var(--red);align-self:center;font-weight:500}

/* 7 · patterns */
#irb .pats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:22px}
#irb .pat{cursor:pointer;text-align:left;font:inherit;color:inherit;border:1px solid var(--line);background:rgba(255,255,255,.02);border-radius:18px;padding:20px;min-height:150px;transition:border-color .4s,background .4s;position:relative}
#irb .pat:last-child{grid-column:1/-1}
#irb .pat .pn{font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold);display:block;margin-bottom:10px}
#irb .pat .tag{font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;font-weight:600;display:block;margin-bottom:4px}
#irb .pat .risky .tag{color:var(--orange)}#irb .pat .safe .tag{color:var(--green)}
#irb .pat .safe{display:none}
#irb .pat.on{border-color:rgba(127,209,164,.55);background:rgba(127,209,164,.06)}
#irb .pat.on .risky{display:none}#irb .pat.on .safe{display:block}
#irb .pat .hint{position:absolute;right:16px;top:18px;font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint)}
#irb .pat.on .hint{color:var(--green)}
#irb .three{margin-top:20px;text-align:center;color:var(--ink-soft)}#irb .three b{color:var(--gold);font-weight:500}

/* 8 · checklist */
#irb .meter{height:8px;border-radius:99px;background:rgba(255,255,255,.07);overflow:hidden;margin:14px 0 6px}
#irb .meter i{display:block;height:100%;width:0;background:linear-gradient(90deg,#a8792c,#f6dc95);transition:width .5s}
#irb .mcount{font-size:12.5px;color:var(--ink-faint);letter-spacing:.12em;text-transform:uppercase}
#irb .checks{display:grid;gap:8px;margin-top:14px}
#irb .check{display:flex;gap:14px;align-items:flex-start;padding:13px 16px;border-radius:14px;border:1px solid var(--line);cursor:pointer;font-size:15.5px;transition:background .3s,border-color .3s}
#irb .check input{appearance:none;-webkit-appearance:none;flex:none;width:22px;height:22px;margin:2px 0 0;border-radius:7px;border:1.5px solid var(--gold-soft);display:grid;place-items:center;cursor:pointer}
#irb .check input:checked{background:var(--gold);border-color:var(--gold)}
#irb .check input:checked::after{content:'✓';color:#2a1d07;font-size:14px;font-weight:700}
#irb .check:has(input:checked){background:var(--gold-faint);border-color:var(--gold-soft)}

/* 9 · quiz */
#irb .qtop{display:flex;justify-content:space-between;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint)}
#irb .qq{font-family:var(--display);font-size:clamp(24px,3.8vw,30px);line-height:1.3;margin:16px 0 18px}
#irb .opts{display:grid;gap:10px}
#irb .opt{cursor:pointer;text-align:left;border:1px solid var(--line);background:rgba(255,255,255,.02);color:var(--ink);border-radius:14px;padding:14px 18px;font:400 16px var(--body);transition:all .3s}
#irb .opt:hover{border-color:var(--gold-soft)}
#irb .opt.right{border-color:var(--green);background:rgba(127,209,164,.1)}
#irb .opt.wrong{border-color:var(--red);background:rgba(240,163,122,.07)}
#irb .opt[disabled]{cursor:default}
#irb .badge{display:none;text-align:center;padding:10px 0}
#irb .badge.show{display:block;animation:rise 1s ease}
#irb .medal{width:150px;height:150px;margin:0 auto 18px;border-radius:50%;display:grid;place-items:center;font-size:58px;background:radial-gradient(circle at 40% 35%,#fff6df,#e8c77a 45%,#a8792c 100%);box-shadow:0 0 0 6px rgba(212,168,83,.18),0 0 60px rgba(212,168,83,.5);animation:glow 3s ease-in-out infinite}
@keyframes glow{0%,100%{box-shadow:0 0 0 6px rgba(212,168,83,.18),0 0 40px rgba(212,168,83,.4)}50%{box-shadow:0 0 0 10px rgba(212,168,83,.12),0 0 80px rgba(246,220,149,.65)}}
@keyframes rise{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}

/* principles */
#irb .principles{display:grid;gap:6px;margin-top:20px;text-align:center}
#irb .principles p{font-family:var(--display);font-weight:300;font-size:clamp(24px,3.6vw,33px);line-height:1.3;margin:0 auto;max-width:none;opacity:.35;transition:opacity 1s}
#irb .principles p.lit{opacity:1}
#irb .lfoot{margin-top:80px;text-align:center;font-size:13px;color:var(--ink-faint);letter-spacing:.08em}

#irb .reveal{opacity:0;transform:translateY(24px);transition:opacity 1s ease,transform 1s ease}#irb .reveal.in{opacity:1;transform:none}
#irb .emo{display:inline-block;font-style:normal;filter:grayscale(1) brightness(1.15) sepia(1) saturate(2.4) hue-rotate(-4deg) brightness(1.08) drop-shadow(0 0 5px rgba(212,168,83,.5))}
#irb .dust{position:fixed;width:4px;height:4px;border-radius:50%;background:#fff3d6;box-shadow:0 0 8px #ffe2a6;pointer-events:none;z-index:40}

@media (max-width:720px){
  #irb .bks{grid-template-columns:1fr}#irb .ideas-nav{grid-template-columns:1fr}#irb .inav b{font-size:19px}#irb .flow{grid-template-columns:1fr;gap:26px}#irb .flow .wire,#irb .flow .spark{display:none}#irb .node .say{min-height:0}#irb .duo{grid-template-columns:1fr}#irb .wall{width:38px;margin-left:-19px}#irb .wall i{display:none}
  #irb .lab{grid-template-columns:1fr}#irb .pats{grid-template-columns:1fr}
  #irb .picks{grid-template-columns:repeat(2,1fr)}#irb .ptrack{grid-template-columns:repeat(2,1fr)}
  #irb .rung{grid-template-columns:1fr;gap:6px}#irb .rule .body{padding-left:18px}
  #irb .glass{padding:22px 18px}#irb .keys{gap:8px;padding:9px 14px}#irb .keys .k{width:15px;height:15px}#irb .keys .lbl{display:none}
}
@media (prefers-reduced-motion:reduce){#irb *{animation:none!important;transition:none!important}#irb .reveal{opacity:1;transform:none}#irb{scroll-behavior:auto}}