:root{
  --navy:#003057;--blue:#0072ce;--teal:#147d78;--gold:#c68700;--green:#18794e;--red:#b42318;
  --ink:#1f2933;--muted:#5d6b77;--line:#d7e1e7;--bg:#f4f7f9;--card:#fff;--soft:#eaf3f8;
  --purple:#6f55b6;--shadow:0 12px 30px rgba(0,48,87,.08)
}
*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink)}button{font:inherit}
.skip-link{position:fixed;left:16px;top:12px;z-index:100;padding:10px 14px;border-radius:8px;background:var(--navy);color:#fff;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}
.app-shell{width:min(1180px,calc(100% - 28px));margin:14px auto 44px}.site-nav{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;margin-bottom:12px;padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:var(--card);box-shadow:var(--shadow)}.site-nav a{padding:7px 10px;border-radius:8px;color:var(--muted);font-size:.9rem;font-weight:800;text-decoration:none}.site-nav a:hover,.site-nav a:focus-visible{color:var(--blue);background:var(--soft)}.site-nav a[aria-current="page"]{color:#fff;background:var(--blue)}
.hero{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:15px 20px;border-radius:15px;background:linear-gradient(120deg,var(--navy),#0e567e);color:#fff;box-shadow:var(--shadow)}.eyebrow{margin:0 0 3px;font-size:.76rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#d8ebf6}.hero h1{margin:0;font-size:clamp(1.55rem,3vw,2.2rem)}.hero-copy{margin:5px 0 0;max-width:760px;color:#e9f4fa}.hero-status{min-width:160px;padding:9px 12px;border:1px solid rgba(255,255,255,.28);border-radius:11px;background:rgba(255,255,255,.1);text-align:right}.hero-status span,.hero-status strong,.hero-status em{display:block}.hero-status span{font-size:.78rem;color:#d9edf7}.hero-status em{margin-top:3px;font-size:.78rem;font-style:normal;color:#ffe6a3;font-weight:800}
.mission-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:12px 0}.mission-tab{display:flex;align-items:center;gap:8px;min-height:52px;padding:9px 12px;border:1px solid var(--line);border-radius:11px;background:#fff;color:var(--navy);font-weight:750;cursor:pointer;justify-content:center;text-align:center}.mission-tab:hover,.mission-tab:focus-visible{border-color:var(--blue)}.mission-tab.active{background:var(--blue);border-color:var(--blue);color:#fff}
.control:focus-visible,.dot:focus-visible,a:focus-visible,.choice:focus-visible,.path-node:focus-visible{outline:3px solid var(--blue);outline-offset:3px}.lesson-card{padding:17px;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:var(--shadow)}.lesson-heading-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding-bottom:11px;border-bottom:1px solid var(--line)}.lesson-kicker,.step-label{margin:0 0 4px;font-size:.76rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.lesson-kicker{color:var(--blue)}.lesson-card h2{margin:0;color:var(--navy)}.lesson-badge{padding:6px 10px;border-radius:999px;background:var(--soft);color:var(--navy);font-weight:750;font-size:.84rem}.step-toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:13px 0}.step-toolbar.bottom{margin:15px 0 0}.control{border:0;border-radius:9px;padding:9px 14px;font-weight:800;cursor:pointer}.control:disabled{opacity:.38;cursor:not-allowed}.control.primary{background:var(--blue);color:#fff}.control.secondary{background:var(--soft);color:var(--navy)}.control.ghost{background:#eef2f4;color:var(--muted)}.step-dots{display:flex;justify-content:center;align-items:center;gap:6px;flex-wrap:wrap}.dot{width:9px;height:9px;padding:0;border:0;border-radius:99px;background:#c6d2d9;cursor:pointer}.dot.active{width:27px;background:var(--blue)}.dot.done{background:var(--teal)}
.lesson-grid{display:grid;grid-template-columns:minmax(280px,.88fr) minmax(480px,1.6fr);gap:15px;min-height:500px}.explanation-panel,.visual-panel{border:1px solid var(--line);border-radius:13px}.explanation-panel{padding:19px;background:#fbfcfd}.step-label{color:var(--teal)}.explanation-panel h3{margin:3px 0 9px;color:var(--navy);font-size:clamp(1.2rem,2vw,1.65rem)}.explanation-panel>p:not(.step-label){font-size:1.01rem;line-height:1.64}.concept-box{margin-top:17px;padding:12px 13px;border-left:5px solid var(--gold);border-radius:8px;background:#fff6dd}.concept-box p{margin:4px 0 0;line-height:1.48}.student-led-note{margin-top:12px;padding:10px 12px;border-radius:9px;background:#eef7ff;color:#164f74;font-size:.9rem}.visual-panel{display:flex;align-items:center;justify-content:center;overflow:hidden;padding:18px;background:radial-gradient(circle at top,#fff,#eef5f8)}.scene{width:100%;max-width:790px;text-align:center}
.challenge-title{margin:0 0 12px;color:var(--navy);font-weight:900}.helper{margin:10px auto 0;max-width:650px;color:var(--muted);font-size:.9rem}.feedback{min-height:48px;margin-top:13px;padding:11px 13px;border-radius:10px;font-weight:800;display:flex;align-items:center;justify-content:center}.feedback.neutral{background:#eef2f4;color:#586671}.feedback.good{background:#eaf7ef;color:var(--green);animation:pop .35s ease}.feedback.bad{background:#fff0ee;color:var(--red);animation:shake .45s ease}
.path-board{position:relative;display:grid;grid-template-columns:repeat(5,1fr);gap:9px;align-items:stretch;margin:8px auto 0;max-width:760px}.path-board::before{content:"";position:absolute;left:9%;right:9%;top:50%;height:4px;background:#d9e5ec;z-index:0}.path-node{position:relative;z-index:1;min-height:122px;padding:12px 8px;border:2px solid var(--line);border-radius:13px;background:#fff;cursor:pointer;box-shadow:0 8px 18px rgba(0,48,87,.06);transition:.18s transform,.18s border-color,.18s background}.path-node:hover{transform:translateY(-3px);border-color:#98bdd6}.path-node .big{display:block;font-size:2rem;margin-bottom:5px}.path-node strong{display:block;color:var(--navy)}.path-node small{display:block;margin-top:4px;color:var(--muted)}.path-node.done{border-color:#61a77f;background:#effaf3}.path-node.current{border-color:var(--blue);background:#eef7ff;animation:pulse .7s ease}.path-node.wrong{border-color:var(--red);background:#fff0ee;animation:shake .45s ease}.packet{position:absolute;z-index:3;top:45%;left:7%;font-size:1.5rem;filter:drop-shadow(0 4px 4px rgba(0,0,0,.12));transition:left .55s cubic-bezier(.2,.8,.2,1),transform .55s}.packet.fly{transform:translateY(-18px) rotate(12deg)}
.choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;max-width:680px;margin:0 auto}.choice{padding:14px;border:2px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font-weight:800;cursor:pointer;transition:.18s}.choice:hover{border-color:#8eb9d7;transform:translateY(-2px)}.choice.good{border-color:#61a77f;background:#effaf3;color:#205f3f}.choice.bad{border-color:#df857e;background:#fff0ee;color:#8e1e18}.choice span{display:block;font-size:1.7rem;margin-bottom:4px}.multi-answer{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;max-width:720px;margin:auto}.multi-answer .choice{min-height:120px}
.world{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center;max-width:720px;margin:auto}.state-box{padding:15px;border:2px solid var(--line);border-radius:14px;background:#fff;box-shadow:0 8px 18px rgba(0,48,87,.06)}.state-box h4{margin:0 0 9px;color:var(--navy)}.acct-row{display:flex;justify-content:space-between;gap:8px;padding:7px 9px;margin:6px 0;border-radius:8px;background:#f6f9fb}.tx-arrow{font-size:2.3rem;color:var(--blue);animation:float 1.6s ease-in-out infinite}
.account-duel{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:690px;margin:auto}.account-card{padding:18px;border:2px solid var(--line);border-radius:15px;background:#fff;box-shadow:0 10px 22px rgba(0,48,87,.07);cursor:pointer;transition:.2s}.account-card:hover{transform:translateY(-3px);border-color:#8eb9d7}.account-card .big{font-size:2.6rem}.account-card h4{margin:6px 0;color:var(--navy)}.account-card p{margin:4px 0;color:var(--muted)}.account-card.selected-good{border-color:#61a77f;background:#effaf3}.account-card.selected-bad{border-color:#df857e;background:#fff0ee}.badge-row{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:10px}.mini-badge{padding:6px 9px;border-radius:999px;background:#eef2f4;font-size:.8rem;font-weight:800;color:#53636e}
.tx-builder{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center;max-width:700px;margin:auto}.tx-card{padding:16px;border:2px solid var(--line);border-radius:14px;background:#fff}.tx-card .big{font-size:2.2rem}.tx-card strong{display:block;color:var(--navy)}.tx-card p{margin:5px 0;color:var(--muted)}.arrow{font-size:2rem;color:var(--blue);font-weight:900}.tx-burst{display:inline-block;padding:10px 12px;border-radius:11px;background:#e8f3fb;color:#164f74;font-weight:900;animation:slide .7s ease}
.wallet-vault{display:flex;justify-content:center;gap:15px;align-items:center;flex-wrap:wrap}.wallet{position:relative;width:180px;min-height:145px;padding:18px;border:3px solid #536f82;border-radius:18px;background:linear-gradient(145deg,#f8fbfd,#dbe8ef);box-shadow:0 12px 22px rgba(0,48,87,.1)}.wallet .big{font-size:3.2rem}.wallet strong{display:block;color:var(--navy)}.wallet.open{animation:pop .4s ease}.key-chip{margin-top:8px;padding:8px 10px;border-radius:999px;background:#fff6dd;color:#795600;font-weight:900;animation:pulse .8s ease}.chain-balance{padding:15px;border-radius:13px;background:#fff;border:2px solid #92c8a8}.chain-balance .big{font-size:2.2rem}.chain-balance strong{display:block;color:#205f3f}
.gas-lab{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:700px;margin:auto}.gas-card{padding:16px;border:2px solid var(--line);border-radius:14px;background:#fff;cursor:pointer}.gas-card:hover{border-color:#8eb9d7}.gas-card h4{margin:5px 0;color:var(--navy)}.gas-meter{height:18px;margin-top:10px;border-radius:999px;background:#e8edf0;overflow:hidden}.gas-fill{height:100%;width:0;background:linear-gradient(90deg,#2f9d6b,#e6b54a,#d15f55);transition:width .8s ease}.gas-card.active .gas-fill.transfer{width:38%}.gas-card.active .gas-fill.contract{width:82%}.gas-card.active{border-color:var(--blue);background:#f4faff}.gas-label{margin-top:7px;font-size:.83rem;color:var(--muted)}
.token-sort{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:700px;margin:auto}.token-zone{padding:16px;border:2px dashed #9db1bd;border-radius:14px;background:#fff}.token-zone h4{margin:0 0 10px;color:var(--navy)}.token-items{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:12px}.token-item{padding:10px 12px;border:2px solid var(--line);border-radius:12px;background:#fff;font-weight:850;cursor:pointer}.token-item:hover{border-color:#8eb9d7}.token-item.good{border-color:#61a77f;background:#effaf3}.token-item.bad{border-color:#df857e;background:#fff0ee}.final-card{max-width:650px;margin:auto;padding:22px;border:2px solid #a6cce4;border-radius:17px;background:linear-gradient(145deg,#fff,#eff8fd);box-shadow:0 12px 26px rgba(0,48,87,.08)}.final-card .trophy{font-size:3.5rem;animation:float 1.8s ease-in-out infinite}.final-card h3{margin:6px 0;color:var(--navy)}.final-score{font-size:1.5rem;font-weight:900;color:var(--blue)}
.pop{animation:pop .5s ease}.pulse{animation:pulse .8s ease}.slide{animation:slide .75s ease}.shake{animation:shake .45s ease}.float{animation:float 1.7s ease-in-out infinite}@keyframes pulse{50%{transform:scale(1.06)}}@keyframes pop{from{transform:scale(.78);opacity:.2}to{transform:scale(1);opacity:1}}@keyframes slide{from{transform:translateX(-55px);opacity:.15}to{transform:none;opacity:1}}@keyframes shake{25%{transform:translateX(-7px)}50%{transform:translateX(7px)}75%{transform:translateX(-4px)}}@keyframes float{50%{transform:translateY(-7px)}}
.learning-summary{margin-top:16px;padding:17px;border:1px solid var(--line);border-radius:15px;background:#fff}.learning-summary h2{margin:0 0 12px;color:var(--navy)}.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.summary-grid div{padding:12px;border-radius:10px;background:#f6f9fa}.summary-grid span{font-size:1.65rem}.summary-grid strong{display:block;color:var(--navy)}.summary-grid p{margin:4px 0 0;font-size:.86rem;color:var(--muted)}.resource-credit{margin-top:16px;padding:17px;border:1px solid var(--line);border-radius:15px;background:var(--card);box-shadow:var(--shadow);color:var(--muted);line-height:1.6}.resource-credit p{margin:4px 0}.resource-credit a{color:var(--blue)}.resource-credit details{margin-top:8px}.resource-credit summary{color:var(--navy);cursor:pointer;font-weight:800}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
@media(max-width:980px){.mission-nav{grid-template-columns:1fr}.lesson-grid{grid-template-columns:1fr;min-height:0}.visual-panel{min-height:430px}.summary-grid{grid-template-columns:1fr 1fr}.path-board{grid-template-columns:1fr}.path-board::before,.packet{display:none}.multi-answer{grid-template-columns:1fr}.world,.tx-builder{grid-template-columns:1fr}.tx-arrow,.arrow{transform:rotate(90deg)}.hero{align-items:flex-start}}
@media(max-width:560px){.app-shell{width:min(100% - 16px,1180px)}.hero{display:block}.hero-status{margin-top:10px;text-align:left}.lesson-heading-row{align-items:flex-start;flex-direction:column}.step-toolbar{flex-wrap:wrap}.step-dots{order:3;width:100%}.visual-panel{padding:12px}.summary-grid,.choice-grid,.account-duel,.gas-lab,.token-sort{grid-template-columns:1fr}.student-led-note{font-size:.86rem}}
/* Lesson 6 additions */
.pipeline{display:grid;grid-template-columns:repeat(4,minmax(115px,1fr));gap:12px;align-items:center;position:relative}
.pipe-node{position:relative;padding:16px 10px;border:2px solid var(--line);border-radius:14px;background:#fff;min-height:126px;cursor:pointer;transition:.2s transform,.2s border-color,.2s box-shadow}
.pipe-node:hover{transform:translateY(-2px)}.pipe-node.good{border-color:var(--green);box-shadow:0 10px 24px rgba(24,121,78,.14)}.pipe-node.bad{border-color:var(--red);animation:shake .45s}
.pipe-node .num{position:absolute;right:8px;top:8px;width:26px;height:26px;display:grid;place-items:center;border-radius:50%;background:var(--soft);font-weight:900;color:var(--navy)}
.pipe-node .big{font-size:2.25rem;display:block;margin:12px 0 5px}.pipe-line{height:5px;background:#c7d8e2;border-radius:999px;margin-top:14px;overflow:hidden}.pipe-flow{height:100%;width:0;background:var(--blue);transition:width .65s ease}
.code-card{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;text-align:left;background:#102331;color:#e9f4fa;padding:14px;border-radius:12px;line-height:1.55;overflow:auto}.code-card .kw{color:#74c7ec}.code-card .val{color:#f7ca88}.code-card .goodline{background:rgba(60,190,120,.14);display:block;margin:0 -5px;padding:0 5px}.code-card .badline{background:rgba(220,80,70,.14);display:block;margin:0 -5px;padding:0 5px}
.deploy-stage{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:center}.deploy-arrow{font-size:2rem;color:var(--blue);font-weight:900}.contract-account{padding:18px;border:3px solid #7d92a4;border-radius:16px;background:#fff;box-shadow:0 12px 24px rgba(0,48,87,.1)}.contract-account .big{font-size:3rem}.address-chip{margin-top:8px;padding:7px 10px;border-radius:999px;background:#eef5f8;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.78rem}
.mapping-board{display:grid;grid-template-columns:1fr 1fr;gap:12px}.map-card{padding:15px;border:1px solid var(--line);border-radius:13px;background:#fff}.map-card h4{margin:0;color:var(--navy)}.map-state{display:flex;justify-content:space-between;align-items:center;margin-top:10px;padding:10px;border-radius:10px;background:#f6f9fa}.bool{font-weight:900;padding:5px 9px;border-radius:999px}.bool.false{background:#eef2f4;color:#5d6b77}.bool.true{background:#eaf7ef;color:var(--green)}
.rule-options{display:grid;grid-template-columns:1fr;gap:10px}.rule-btn{padding:13px 14px;border:1px solid var(--line);border-radius:11px;background:#fff;text-align:left;cursor:pointer;font-weight:750}.rule-btn:hover{border-color:var(--blue)}.rule-btn.good{border-color:var(--green);background:#eaf7ef}.rule-btn.bad{border-color:var(--red);background:#fff0ee}
.vote-stage{display:grid;grid-template-columns:1fr 1fr;gap:14px}.candidate{padding:16px;border:1px solid var(--line);border-radius:14px;background:#fff}.candidate .count{font-size:2.2rem;font-weight:900;color:var(--navy)}.vote-buttons{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:12px}.vote-btn{padding:10px 14px;border:0;border-radius:10px;background:var(--blue);color:#fff;font-weight:900;cursor:pointer}.vote-btn.invalid{background:#7d92a4}
.evidence-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.evidence{padding:13px;border:1px solid var(--line);border-radius:11px;background:#fff;cursor:pointer}.evidence.good{border-color:var(--green);background:#eaf7ef}.evidence.bad{border-color:var(--red);background:#fff0ee}
.vault{position:relative;padding:18px;border:4px solid #6e7f8c;border-radius:18px;background:linear-gradient(160deg,#edf3f6,#cddbe3);box-shadow:inset 0 0 0 5px #f8fbfc,0 15px 25px rgba(0,48,87,.12)}.vault .door{font-size:4rem}.vault .funds{display:inline-flex;align-items:center;justify-content:center;width:62px;height:62px;border-radius:50%;background:#fff6dd;border:2px solid #e4c264;font-size:1.8rem}.vault .status{margin-top:8px;font-weight:900;color:var(--navy)}
.input-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}.input-card{padding:13px;border:1px solid var(--line);border-radius:11px;background:#fff}.input-card strong{display:block;color:var(--navy)}
.clock-track{position:relative;height:16px;background:#e1e9ee;border-radius:999px;margin:20px 0 8px;overflow:hidden}.clock-fill{height:100%;width:10%;background:linear-gradient(90deg,var(--blue),var(--teal));transition:width .7s ease}.clock-labels{display:flex;justify-content:space-between;color:var(--muted);font-size:.82rem}.time-display{font-size:2rem;font-weight:900;color:var(--navy);margin:10px 0}.time-btn{padding:10px 14px;border:0;border-radius:10px;background:var(--blue);color:#fff;font-weight:900;cursor:pointer}.time-btn:disabled{opacity:.45}.attempt-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.attempt{padding:14px;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer}.attempt.good{border-color:var(--green);background:#eaf7ef}.attempt.bad{border-color:var(--red);background:#fff0ee}.event-log{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;padding:12px;border-radius:10px;background:#102331;color:#e9f4fa;text-align:left}
@media(max-width:860px){.pipeline{grid-template-columns:1fr 1fr}.deploy-stage,.vote-stage,.input-pair,.attempt-row{grid-template-columns:1fr}.deploy-arrow{transform:rotate(90deg)}.evidence-grid{grid-template-columns:1fr}.mapping-board{grid-template-columns:1fr}}