/* HUBMAT Visual · Balança Algébrica. No external font, framework or generated layout. */
:root{color-scheme:light;--ink:#152e47;--muted:#536775;--green:#116149;--green-soft:#eaf4ec;--paper:#fafbf7;--line:#dce4da;--gold:#f1c45a;--blue:#dce7fb;--white:#fff;--radius:20px}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.55 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,textarea{font:inherit}button,a,input,textarea,summary{-webkit-tap-highlight-color:transparent}button,a,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}a{color:var(--green)}[hidden]{display:none!important}:focus-visible{outline:3px solid #2257b0;outline-offset:4px}button:focus-visible{position:relative;z-index:2}.skip{opacity:0;pointer-events:none;position:fixed;left:12px;top:-90px;padding:12px;background:white;z-index:100}.skip:focus{top:8px;opacity:1;pointer-events:auto}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.site-header{border-bottom:1px solid var(--line);background:#fff}.header-inner{max-width:1120px;margin:auto;min-height:76px;padding:12px 24px;display:flex;align-items:center;gap:18px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;line-height:1.2}.mark{font-size:32px;letter-spacing:-4px;padding-right:4px}.mark span{color:var(--green);font-size:25px}.brand small{display:block;font-size:11px;font-weight:650;letter-spacing:.13em;text-transform:uppercase;margin-top:5px;color:var(--muted)}.header-back{margin-left:auto;text-decoration:none;font-weight:650;font-size:14px;padding:10px 8px}.site-menu{position:relative}.site-menu summary{list-style:none;font-size:14px;font-weight:700;min-height:44px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;cursor:pointer}.site-menu summary::-webkit-details-marker{display:none}.site-menu nav{position:absolute;right:0;top:54px;z-index:30;min-width:220px;padding:8px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 15px 35px #152e4720}.site-menu nav a{display:block;color:var(--ink);text-decoration:none;padding:10px 14px;border-radius:8px;min-height:44px}.site-menu nav a:hover{background:var(--green-soft)}
.lesson{max-width:1000px;margin:0 auto;padding:30px 24px 24px}.lesson-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px}.eyebrow{text-transform:uppercase;letter-spacing:.11em;font-size:11px;font-weight:800;color:var(--green);margin:0 0 8px}.lesson-heading h1{font-size:clamp(30px,4vw,43px);letter-spacing:-.045em;line-height:1.12;margin:0}.lesson-heading p:last-child{font-size:15px;color:var(--muted);margin:9px 0 0}.curriculum-tag{white-space:nowrap;font-size:12px;padding:7px 10px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--muted)}.journey{margin-bottom:20px}.journey-top{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;color:var(--muted);font-weight:650}.phases{list-style:none;display:flex;padding:0;margin:0;gap:18px}.phases li{padding:4px 0;border-bottom:2px solid transparent}.phases li[aria-current="step"]{color:var(--green);border-color:var(--green);font-weight:850}.journey progress{display:block;width:100%;height:7px;border:0;border-radius:8px;margin-top:10px;background:#e4e9e0;accent-color:var(--green)}progress::-webkit-progress-bar{background:#e4e9e0;border-radius:8px}progress::-webkit-progress-value{background:var(--green);border-radius:8px}progress::-moz-progress-bar{background:var(--green);border-radius:8px}
.challenge{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-bottom:22px;box-shadow:0 6px 20px #22392004}.challenge-top{padding:25px 30px 12px}.step-label{display:block;color:var(--green);font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;margin-bottom:7px}.challenge h2{font-size:clamp(22px,3vw,30px);line-height:1.22;letter-spacing:-.025em;margin:0 0 10px}.challenge .lead{max-width:710px;color:var(--muted);margin:0;font-size:16px;line-height:1.55}.workspace{background:linear-gradient(180deg,#fbfcf7,#f5f8f1);margin:8px 16px 0;border:1px solid #e6ebe1;border-radius:16px;padding:16px 16px 12px}.equation{text-align:center;font-size:clamp(24px,4vw,36px);font-weight:750;letter-spacing:-.025em;line-height:1.3;margin:0 0 3px;font-variant-numeric:tabular-nums}.eq-accent{color:var(--green)}.equation-context{text-align:center;font-size:12px;color:var(--muted);margin:4px 0 10px}.balance{position:relative;margin:0 auto;max-width:660px;height:242px;isolation:isolate}.beam{position:absolute;left:23%;width:54%;height:7px;bottom:65px;border-radius:6px;background:var(--ink);transform-origin:50% 50%;transition:transform .32s ease}.pivot{position:absolute;left:calc(50% - 9px);bottom:59px;width:18px;height:18px;background:var(--green);border:4px solid #fff;border-radius:50%;z-index:3}.stand{position:absolute;left:calc(50% - 24px);bottom:9px;width:48px;height:62px;background:var(--ink);clip-path:polygon(43% 0,57% 0,100% 100%,0 100%)}.base{position:absolute;bottom:1px;left:calc(50% - 65px);width:130px;height:9px;border-radius:5px;background:var(--ink)}.tray{position:absolute;bottom:65px;width:44%;min-height:137px;background:transparent;border:0;border-bottom:7px solid var(--ink);border-radius:0 0 18px 18px;padding:9px 7px 10px;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:8px;transition:transform .32s ease,background .15s}.tray-left{left:1%}.tray-right{right:1%}.tray:disabled{opacity:1;cursor:default}.tray:not(:disabled):hover{background:#dcece0}.tray.is-selected{outline:3px solid var(--green);outline-offset:3px;background:#e3efdf}.tray-name{position:absolute;top:calc(100% + 12px);font-size:12px;font-weight:700;color:var(--muted)}.pieces{display:flex;align-items:flex-end;justify-content:center;flex-wrap:wrap;gap:5px;max-width:230px}.mystery{display:inline-flex;align-items:center;justify-content:center;width:44px;height:48px;background:var(--blue);border:2px solid #356195;border-radius:9px;box-shadow:3px 3px 0 #b6c9e5;color:#173c68;font:italic 750 28px Georgia,serif}.unit{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;background:var(--gold);border:1px solid #997326;border-radius:6px;box-shadow:0 2px 0 #d2a543;color:#403010;font-size:13px;font-weight:800;line-height:1}.unit.half{background:linear-gradient(90deg,var(--gold) 50%,#fff7df 50%);width:36px}.balance-state{text-align:center;margin:0;min-height:24px;font-size:13px;font-weight:750;color:var(--green)}.balance-state[data-equal="false"]{color:#8c451a}.legend{display:flex;justify-content:center;gap:16px;font-size:12px;color:var(--muted);margin:14px 0 0;flex-wrap:wrap}.legend span{display:flex;align-items:center;gap:6px}.legend .unit{width:18px;height:18px;font-size:10px}.legend .mystery{width:22px;height:24px;font-size:17px;box-shadow:none}.board-note{text-align:center;font-size:12px;color:var(--muted);margin:8px 0 0}
.actions{padding:17px 30px 21px}.button-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:11px 17px;border:1px solid #b8cbbd;border-radius:11px;background:#fff;color:var(--ink);font-weight:750;font-size:14px;text-decoration:none;line-height:1.3}.btn:hover:not(:disabled){background:#f0f5ef}.btn.primary{background:var(--green);border-color:var(--green);color:white;box-shadow:0 3px 0 #0a4433}.btn.primary:hover:not(:disabled){background:#0d523d}.btn.quiet{background:transparent;border-color:var(--line);box-shadow:none}.prediction{border:0;margin:0 0 14px;padding:0}.prediction legend{font-weight:700;font-size:14px;margin-bottom:10px}.prediction-options{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.prediction label{display:flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--line);padding:13px 8px;border-radius:10px;min-height:48px;font-size:14px;cursor:pointer}.prediction label:has(input:checked){border-color:var(--green);background:var(--green-soft);box-shadow:0 0 0 1px var(--green)}input[type="radio"],input[type="checkbox"]{accent-color:var(--green);width:18px;height:18px;flex-shrink:0}.hint{font-size:14px;color:var(--muted);margin-top:14px}.hint summary{min-height:44px;display:list-item;cursor:pointer;color:var(--green);font-weight:700;padding:10px 0}.hint p{margin:0 0 8px;padding-left:16px;border-left:3px solid #d0deca;max-width:660px}.feedback{margin:0;padding:15px 30px;background:#f5f7f2;border-top:1px solid var(--line);font-size:14px;min-height:62px;line-height:1.6}.feedback[data-tone="good"]{background:#eaf4e7;color:#174e31}.feedback[data-tone="retry"]{background:#fff3dc;color:#73451b}.history{font-size:12px;color:var(--muted);margin-top:12px}.history summary{padding:8px 0;min-height:40px;cursor:pointer}.history ol{padding-left:20px;max-height:160px;overflow:auto}.history li{padding:3px 0}.history li:last-child{font-weight:750;color:var(--ink)}
.share-workspace{padding:20px 20px 24px}.share-bank{padding:14px;margin:14px auto 18px;max-width:480px;border:1px dashed #9cafa0;border-radius:14px;background:#fff;text-align:center}.share-bank p{font-size:13px;color:var(--muted);margin:0 0 10px}.bank-tokens{display:flex;justify-content:center;flex-wrap:wrap;gap:6px;min-height:30px}.bank-token{display:inline-flex;align-items:center;justify-content:center;min-width:44px;height:44px;border:1px solid #9d792c;border-radius:8px;background:var(--gold);color:#3c2c0b;font-weight:800;touch-action:none;cursor:grab}.bank-token:disabled{display:none}.bank-token.selected{outline:3px solid var(--green);outline-offset:2px}.share-groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.share-group{padding:16px;border:1px solid #becdbb;border-radius:15px;background:#fff;min-width:0}.share-group.is-over{outline:3px solid var(--green);background:#ebf3e8}.share-title{display:flex;align-items:center;justify-content:space-between;gap:6px;font-size:13px;font-weight:750}.group-units{display:flex;flex-wrap:wrap;justify-content:center;gap:5px;min-height:64px;align-content:center;margin:10px 0}.group-buttons{display:flex;gap:6px;justify-content:center}.group-buttons .btn{min-width:46px;padding:8px 12px}.group-count{font-variant-numeric:tabular-nums;font-size:22px;font-weight:800}.receipt{display:grid;grid-template-columns:1fr auto;gap:10px;max-width:470px;margin:10px auto 22px;padding:22px;background:#fff;border:1px solid #d9e3d4;border-radius:12px;box-shadow:5px 5px 0 #e7eddf}.notebooks{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.notebook{width:48px;height:64px;display:grid;place-items:center;border:2px solid #34618a;border-left:6px solid #34618a;border-radius:4px 9px 9px 4px;background:#e6eefb;font:italic 700 22px Georgia,serif}.receipt-total{grid-column:1/-1;display:flex;justify-content:space-between;font-size:20px;font-weight:800;border-top:1px dashed #bdcbb6;padding-top:12px}.receipt small{font-size:13px;color:var(--muted)}.form-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:12px 0 16px}.form-grid label,.write-label{display:flex;flex-direction:column;gap:7px;font-weight:700;font-size:13px}.form-grid input,.write-label input,.write-label textarea{width:100%;min-height:48px;padding:10px 12px;border:1px solid #9baeb2;border-radius:9px;background:white;color:var(--ink)}.form-grid input{font-size:21px;font-variant-numeric:tabular-nums}.write-label{margin:12px 0}.write-label textarea{min-height:120px;resize:vertical;font-size:15px;line-height:1.6}.self-checks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;border:0;padding:0;margin:16px 0}.self-checks legend{font-size:14px;font-weight:750;margin-bottom:10px}.self-checks label{font-size:13px;display:flex;align-items:flex-start;gap:8px;min-height:44px}.small-print{font-size:12px;line-height:1.6;color:var(--muted)}
.lesson-controls{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;padding:0 0 20px}.lesson-controls #next{justify-self:end}.lesson-controls #previous{justify-self:start}.lesson-controls #reset{font-size:12px}.finish{border:1px solid #b8d5ba;background:#edf6e8;border-radius:18px;padding:28px;margin-bottom:24px}.finish h2{font-size:26px;margin:0 0 8px}.finish p{margin:10px 0}.teacher{margin-top:12px;border-top:1px solid var(--line);padding-top:6px;color:var(--muted);font-size:13px}.teacher>summary{cursor:pointer;font-weight:700;min-height:44px;padding:11px 0}.teacher p{max-width:800px}.teacher h3{color:var(--ink);font-size:15px}.teacher a{overflow-wrap:anywhere}.footer{max-width:1000px;padding:20px 24px 30px;margin:auto;border-top:1px solid var(--line);display:flex;gap:20px;justify-content:space-between;align-items:flex-start;color:var(--muted);font-size:12px}.footer p{margin:0}.signature{text-align:right}.signature a{display:block;text-decoration:none;font-weight:750}.signature small{display:block}.offline-note{padding:16px;background:#fff3dc;border-radius:12px}.paper-answer{color:var(--muted);font-size:13px;padding:10px 30px}.is-ready .paper-answer{display:none}
.tray-right .pieces{display:grid;grid-template-columns:repeat(4,28px);gap:5px;max-width:none}.tray-right .pieces:has(.half){display:flex}
@media(min-width:920px){.challenge{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(290px,.85fr)}.challenge-top,.feedback,.paper-answer{grid-column:1/-1}.challenge>.workspace{margin:8px 6px 20px 16px;align-self:start}.challenge>.actions{padding:20px 20px 20px 14px;display:flex;flex-direction:column;justify-content:center}.prediction-options{grid-template-columns:1fr}.prediction label{justify-content:flex-start;padding:12px 14px}.form-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.challenge[data-kind="create"]{grid-template-columns:1fr}.challenge[data-kind="create"]>.workspace{margin-right:16px}.challenge[data-kind="create"]>.actions{padding:10px 30px 24px}.challenge[data-kind="create"] .form-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:650px){.header-inner{padding:10px 16px;min-height:68px;gap:8px}.brand{font-size:15px}.brand small{font-size:9px}.mark{font-size:28px}.header-back{font-size:12px;padding-inline:4px}.site-menu summary{font-size:12px;padding:10px}.lesson{padding:18px 12px 18px}.lesson-heading{display:block;margin-bottom:20px}.lesson-heading p:last-child{font-size:14px}.curriculum-tag{display:none}.journey-top{gap:6px}.phases{gap:14px;font-size:11px}.journey-top>span{font-size:11px}.challenge-top{padding:20px 18px 12px}.challenge .lead{font-size:15px}.workspace{margin:5px 8px 0;padding:14px 6px 12px;border-radius:12px}.balance{height:210px}.tray{padding:6px 2px 10px;min-height:125px}.pieces{gap:4px}.tray-right .pieces{grid-template-columns:repeat(4,24px);gap:4px}.mystery{width:35px;height:40px;font-size:25px}.unit{width:24px;height:24px;font-size:12px}.actions{padding:16px 18px 20px}.prediction-options{gap:6px}.prediction label{font-size:12px;padding:12px 5px;gap:5px}.feedback{padding:14px 18px}.legend{gap:12px;font-size:11px}.legend .mystery{width:19px;height:22px;font-size:15px}.board-note{font-size:11px}.share-groups{gap:8px}.share-group{padding:12px 8px}.share-title{font-size:11px;gap:4px}.share-bank{padding:12px 8px}.share-workspace{padding:14px 8px}.bank-tokens{gap:6px}.form-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.receipt{padding:15px;margin:8px 6px 16px}.notebook{width:37px;height:52px}.self-checks{grid-template-columns:1fr}.lesson-controls{grid-template-columns:1fr 1fr;gap:10px}.lesson-controls #reset{grid-row:2;grid-column:1/-1;justify-self:center;min-height:44px}.lesson-controls #next{grid-column:2;grid-row:1}.footer{padding-inline:16px;font-size:11px}.footer>p{max-width:185px}.finish{padding:20px}.finish h2{font-size:23px}}
@media(max-width:370px){.brand small{letter-spacing:.05em}.header-back{max-width:95px;line-height:1.3;text-align:center}.prediction-options{grid-template-columns:repeat(3,minmax(0,1fr))}.prediction label{padding:10px 5px}.lesson-heading h1{font-size:29px}.phases{gap:9px}.btn{padding-inline:12px}.tray-name{font-size:11px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media print{body{background:#fff;font-size:12pt}.site-header,.journey,.lesson-controls,.footer,.actions [data-live-only],[data-live-only],.hint,.history,.feedback{display:none!important}.lesson{padding:0;max-width:none}.challenge,.challenge[hidden]{display:block!important;box-shadow:none;break-inside:avoid;margin-bottom:20px}.workspace{background:#fff}.paper-answer,.is-ready .paper-answer{display:block}.teacher{display:block}.challenge-top{padding:16px}.challenge{border-color:#bbb}.lesson-heading{display:block}.curriculum-tag{margin-top:10px}}