:root{color-scheme:light;--ink:#17313b;--muted:#5e7479;--paper:#f5f7f2;--white:#fff;--line:#dce8df;--mint:#bce9d3;--green:#1b6f58;--yellow:#f6ca6f;--dark:#193d3d;--coral:#ef9277}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.55}button,a{font:inherit}a{color:inherit}button{cursor:pointer}.topbar{display:flex;align-items:center;gap:2rem;padding:18px max(5%,calc((100vw - 1200px)/2));background:#fff;border-bottom:1px solid var(--line);position:relative}.brand{display:flex;gap:9px;text-decoration:none;font-size:22px;font-weight:850;line-height:1}.brand span span{color:var(--green)}.brand small{display:block;font-size:9px;letter-spacing:.15em;color:var(--muted);margin-top:5px}.brand-mark{display:grid;place-items:center;background:var(--dark);color:#bef0cf;width:40px;height:40px;border-radius:13px;font-size:25px}.topbar nav{display:flex;gap:25px;margin-left:auto}.topbar nav a{text-decoration:none;font-size:14px;font-weight:700;color:#48615e}.topbar nav a:hover{color:var(--green)}.xp{border:1px solid #eee1bb;background:#fff9e8;color:#805d14;padding:7px 12px;border-radius:999px;font-weight:800;font-size:13px;white-space:nowrap}main{max-width:1200px;margin:auto;padding:36px 24px 72px;min-height:75vh}.hero{background:var(--dark);color:#fff;border-radius:24px;padding:38px 42px;display:grid;grid-template-columns:1fr 280px;gap:25px;overflow:hidden}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:11px;font-weight:850;color:#9adab7}.hero h1{font-size:clamp(32px,5vw,53px);letter-spacing:-.045em;line-height:1.04;margin:15px 0}.hero h1 em{font-style:normal;color:#a8e8c6}.hero p{color:#d2e7df;max-width:590px}.hero-art{align-self:center;border:1px solid #5d8f7e;border-radius:22px;padding:22px;background:#285447}.hero-art .orbit{font-size:50px;line-height:1;color:#c3f0c7}.hero-art strong{display:block;font-size:19px;margin:12px 0 3px}.hero-art small{color:#d2e7df}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:23px}.btn,button.btn{display:inline-flex;align-items:center;justify-content:center;border:0;text-decoration:none;background:var(--mint);color:#153d30;font-weight:800;padding:12px 19px;border-radius:11px;min-height:45px}.btn:hover{filter:brightness(.96)}.btn.secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}.btn.dark{background:var(--dark);color:#fff}.btn:disabled{cursor:not-allowed;opacity:.5}.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin:42px 0 18px}.section-head h2{margin:2px 0;font-size:27px;letter-spacing:-.03em}.section-head p,.muted{color:var(--muted);margin:0}.tag{color:var(--green);font-size:11px;font-weight:850;letter-spacing:.13em;text-transform:uppercase}.progress-label{font-size:13px;font-weight:700;color:var(--green)}.bar{height:8px;border-radius:99px;background:#dce9df;overflow:hidden}.bar span{display:block;height:100%;background:#55b98d;border-radius:99px;transition:width .2s}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:22px}.card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:19px;display:flex;flex-direction:column;min-height:205px}.card:hover{border-color:#a5cdb7;transform:translateY(-2px)}.card-top{display:flex;justify-content:space-between;align-items:center}.icon{height:42px;width:42px;display:grid;place-items:center;border-radius:13px;background:#e6f5ea;font-size:21px}.number{color:#8ba29c;font-size:12px;font-weight:800}.card h3{font-size:16px;line-height:1.25;margin:16px 0 8px}.card p{font-size:13px;color:var(--muted);margin:0 0 15px}.card a{margin-top:auto;color:var(--green);font-weight:800;text-decoration:none;font-size:13px}.badge{font-size:11px;font-weight:800;color:#368165}.surface{max-width:850px;margin:auto}.back{display:inline-block;margin-bottom:20px;text-decoration:none;color:var(--green);font-weight:750}.page-title{font-size:clamp(30px,5vw,45px);line-height:1.1;letter-spacing:-.04em;margin:12px 0}.intro{color:var(--muted);max-width:700px}.lesson,.question,.result,.notice{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;margin:16px 0}.lesson h2{font-size:20px;margin:0 0 10px}.lesson p{margin:0;color:#38535a}.source{font-size:12px;color:#647d78;margin-top:13px}.source a{color:var(--green)}.question h2{font-size:20px;line-height:1.35;margin:0 0 16px}.choices{display:grid;gap:9px}.choice{display:flex;align-items:flex-start;gap:10px;border:1px solid #dae6df;border-radius:11px;padding:12px;cursor:pointer}.choice:has(input:checked){border-color:#49a77d;background:#effaf3}.choice input{margin-top:6px;accent-color:var(--green)}.feedback{margin-top:14px;padding:14px;border-radius:10px;background:#edf8f0;color:#1f593e}.feedback.wrong{background:#fff1ed;color:#8b4031}.feedback p{margin:5px 0 0}.pill{display:inline-block;border-radius:99px;background:#edf7ef;color:var(--green);padding:5px 10px;font-weight:800;font-size:12px}.result h2{margin-top:0}.notice{background:#fff9e8;border-color:#f2e2b5;font-size:14px}.notice p{margin:5px 0}.error{color:#a82c25;font-weight:700}footer{text-align:center;color:#758b85;font-size:12px;padding:25px;border-top:1px solid var(--line)}:focus-visible{outline:3px solid #ec9d38;outline-offset:3px}@media(max-width:850px){.grid{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr 190px;padding:30px}.hero-art{padding:16px}}@media(max-width:560px){.topbar{padding:14px 16px;gap:10px;flex-wrap:wrap}.brand{font-size:19px}.brand-mark{height:36px;width:36px}.xp{margin-left:auto}.topbar nav{order:3;width:100%;margin:4px 0 0;justify-content:space-between;border-top:1px solid #edf1ed;padding-top:10px}.topbar nav a{font-size:13px}main{padding:22px 16px 55px}.hero{display:block;padding:27px 23px}.hero-art{display:none}.hero h1{font-size:35px}.grid{gap:10px}.card{padding:14px;min-height:190px}.card h3{font-size:14px}.section-head{align-items:start}.section-head h2{font-size:23px}.lesson,.question,.result{padding:19px}.actions .btn{flex:1}.page-title{font-size:32px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
/* Prática integrada e ilustração decorativa original */
.hero-art{padding:0;overflow:hidden;align-self:stretch;display:flex;flex-direction:column;justify-content:space-between}.hero-art img{display:block;width:100%;height:180px;object-fit:cover}.hero-art div{padding:0 18px 18px}.hero-art strong{margin-top:12px}.checkpoint{margin-top:20px;border-top:1px solid var(--line);padding-top:14px}.checkpoint summary{cursor:pointer;color:var(--green);font-weight:800;list-style:none;display:flex;justify-content:space-between;gap:8px}.checkpoint summary::-webkit-details-marker{display:none}.checkpoint summary span{color:#66847a;font-size:12px;font-weight:650}.checkpoint form{padding-top:5px}.checkpoint form .btn{margin-top:12px}.checkpoint-feedback:empty{display:none}@media(max-width:560px){.hero-art{display:block;margin-top:22px}.hero-art img{height:120px}.hero-art div{padding:1px 14px 12px}.hero-art strong{font-size:15px}.hero-art small{font-size:12px}}
/* Route focus stays visible without outlining the entire page. */
main:focus-visible{outline:none}main:focus-visible h1{text-decoration:underline;text-decoration-color:#ec9d38;text-decoration-thickness:3px;text-underline-offset:7px}
.topic-scores{list-style:none;padding:0;margin:1.25rem 0 0;display:grid;gap:.75rem}.topic-scores li{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1rem;padding:1rem;border:1px solid #d9e6df;border-radius:12px;background:#f6faf7}.topic-scores li div{display:grid;gap:.2rem}.topic-scores li span{font-size:.9rem}.topic-scores a{font-weight:700}
.plan-form{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:end}.plan-form label{display:grid;gap:6px;font-weight:700}.plan-form input{min-width:0;width:100%;min-height:44px;padding:8px 10px;border:1px solid #9eb8aa;border-radius:9px;background:#fff;color:var(--ink);font:inherit}.plan-form button{justify-self:start}.plan-form p{grid-column:1/-1;margin:0;color:var(--muted)}@media(max-width:560px){.plan-form{grid-template-columns:1fr}.plan-form button{justify-self:stretch}}

.legacy-notice{width:min(850px,calc(100% - 32px));margin:16px auto}
.account-form{display:grid;gap:16px;max-width:620px}.account-form label{display:grid;gap:6px;font-weight:700}.account-form input{width:100%;min-width:0;min-height:44px;padding:8px 10px;border:1px solid #9eb8aa;border-radius:9px;background:#fff;color:var(--ink);font:inherit}.account-form>.btn{justify-self:start}.account-form .actions{margin-top:0}.account-form .actions .btn{flex:0 1 auto}.topbar nav{flex-wrap:wrap;gap:10px 20px}@media(max-width:560px){.account-form>.btn{justify-self:stretch}.topbar nav{justify-content:flex-start;gap:8px 16px}}
.exam-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(48px,1fr));gap:8px}.exam-grid .btn{min-height:44px;padding:8px}.exam-grid .btn[aria-current="step"]{outline:3px solid #1d685a;outline-offset:2px}.exam-grid .btn[aria-label*="não respondida"]{background:#fff}.exam-grid .btn[aria-label*="respondida"]:not([aria-label*="não respondida"]){background:#dcece3}#exam-minutes{min-height:44px;max-width:8rem;padding:8px;font:inherit;border:1px solid #9eb8aa;border-radius:9px}

.plan-form label.integrated-confirm{grid-column:1/-1;display:flex;align-items:flex-start;font-weight:400}.plan-form label.integrated-confirm input{width:20px;min-width:20px;height:20px;min-height:20px;margin:3px 0 0;padding:0}
/* Interactive membrane: a single consistent sculptural teaching model. */
.membrane-lab{margin-top:20px;padding:20px;border:1px solid #c8e2df;border-radius:16px;background:#f0f8f8;color:#173b48}.lab-heading h3{font-size:1.15rem;margin:.2rem 0 .4rem}.lab-heading p{max-width:60ch}.lab-controls{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.lab-controls button{min-height:44px;padding:9px 13px;border:1px solid #87b4b2;border-radius:10px;background:#fff;color:#174f50;font-weight:750}.lab-controls button[aria-pressed=true]{background:#086d70;color:#fff;border-color:#086d70}.lab-controls button:hover{border-color:#075559}.lab-stage{position:relative;display:grid;place-items:center;min-height:235px;overflow:hidden;border-radius:13px;background:linear-gradient(#d4ebf6 0 48%,#b6d9e8 48% 100%);perspective:650px}.lab-outside,.lab-inside{position:absolute;left:14px;z-index:2;color:#244b60;font-size:.8rem;font-weight:700}.lab-outside{top:12px}.lab-inside{bottom:12px}.lab-scene{position:relative;width:82%;height:155px;transform-style:preserve-3d;transform:rotateX(12deg) rotateZ(-2deg)}.lab-membrane{position:absolute;inset:50px 0 48px;border-radius:60% 60% 45% 45%;background:repeating-linear-gradient(90deg,#77bdc6 0 12px,#a6dbe0 12px 24px);box-shadow:0 12px 0 #488f9c,0 18px 16px #396b7a66;transform:translateZ(-12px)}.lab-channel{position:absolute;top:16px;width:74px;height:123px;display:grid;place-items:center;border-radius:45% 45% 35% 35%;color:white;font-weight:800;box-shadow:inset -12px -6px 0 #0002,inset 5px 5px 0 #fff4,0 8px 12px #234b5a55}.lab-channel span{z-index:1}.sodium{left:25%;background:#e57d67}.potassium{right:25%;background:#378bb1}.lab-arrow{display:none;position:absolute;font-size:42px;color:#102e39;text-shadow:0 1px #fff}.lab-stage[data-phase=despolarizacao] .sodium .lab-arrow,.lab-stage[data-phase=repolarizacao] .potassium .lab-arrow{display:block;transform:translateY(35px)}.lab-result{margin-top:14px;padding:14px;border-left:4px solid #168080;background:#fff;border-radius:6px}.lab-result p{margin:.25rem 0 0}.lab-caption{font-size:.8rem;margin-top:10px!important;color:#4a696c!important}@media(max-width:560px){.membrane-lab{padding:14px}.lab-controls button{flex:1 1 auto}.lab-channel{width:60px}.sodium{left:18%}.potassium{right:18%}}
.lab-angle{min-height:44px;margin:0 0 12px;padding:8px 13px;color:#174f50;background:#fff;border:1px solid #87b4b2;border-radius:10px;font-weight:750}.lab-stage[data-angle=girado] .lab-scene{transform:rotateX(22deg) rotateY(-24deg) rotateZ(-2deg)}@media(prefers-reduced-motion:no-preference){.lab-scene{transition:transform .2s ease}}
.lab-channel{color:#102f3a}.lab-controls button:disabled,.lab-angle:disabled{cursor:not-allowed;color:#40585a;background:#e3eceb;border-color:#93aaa9;opacity:1}
.lab-channel{align-content:center;gap:2px}.lab-channel small{font-size:.66rem;line-height:1.1;color:#102f3a}.lab-stage[data-phase=despolarizacao] .sodium,.lab-stage[data-phase=repolarizacao] .potassium{outline:3px solid #173b48;outline-offset:3px}
.lab-channel,.lab-channel small{color:#001116}