/* Explica Exames: identidade "caderno de estudo". Claro = papel quadriculado; escuro = quadro de ardósia. */
:root{--tinta:#14213d;--papel:#fbf8f1;--grelha:rgba(43,80,200,.075);--fg:#14213d;--mut:#55607a;--card:#fffefb;--bd:#e7e0cf;--bd2:#d5ccb6;
--ok:#12805c;--amarelo:#ffd23f;--coral:#ef6f52;--sombra:3px 3px 0 rgba(20,33,61,.1);--sombra2:6px 6px 0 rgba(20,33,61,.13);
--titulo:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
--mao:"Segoe Print","Bradley Hand","Comic Sans MS",cursive;--tema:#2b50c8;--tema2:#e6ebfb;--capa:#2b50c8}
@media(prefers-color-scheme:dark){:root{--papel:#0f1626;--grelha:rgba(255,255,255,.035);--fg:#edf0f7;--mut:#a5afc6;--card:#182136;--bd:#2a3550;--bd2:#3a4768;--ok:#4fd1a1;--sombra:3px 3px 0 rgba(0,0,0,.35);--sombra2:6px 6px 0 rgba(0,0,0,.4)}}
.t-azul{--tema:#2b50c8;--tema2:#e6ebfb;--capa:#2b50c8}
.t-verde{--tema:#127f73;--tema2:#d9f2ec;--capa:#127f73}
.t-laranja{--tema:#c94a2e;--tema2:#fde6df;--capa:#d9583c}
.t-roxo{--tema:#6a3d9a;--tema2:#eee5f8;--capa:#6a3d9a}
@media(prefers-color-scheme:dark){.t-azul{--tema:#8ea8ff;--tema2:#1e2a52}.t-verde{--tema:#5fdcc0;--tema2:#12342f}.t-laranja{--tema:#ff9f85;--tema2:#3a2018}.t-roxo{--tema:#c3a3f0;--tema2:#2c2045}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:150px}
body{margin:0;color:var(--fg);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background-color:var(--papel);
background-image:linear-gradient(var(--grelha) 1px,transparent 1px),linear-gradient(90deg,var(--grelha) 1px,transparent 1px);background-size:28px 28px}
a{color:var(--tema)}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}
h1,h2,h3{font-family:var(--titulo);line-height:1.15;letter-spacing:-.01em}
mark{background:var(--amarelo);color:var(--tinta);padding:0 .16em;border-radius:.1em .3em .15em .35em;-webkit-box-decoration-break:clone;box-decoration-break:clone}

/* cabeçalho */
header.top{position:sticky;top:0;z-index:20;background:var(--card);border-bottom:2px solid var(--tinta)}
@media(prefers-color-scheme:dark){header.top{border-bottom-color:var(--bd2)}}
header.top .wrap{display:flex;gap:14px;align-items:center;justify-content:space-between;height:62px}
.logo{display:flex;align-items:center;gap:10px;font:700 1.22rem var(--titulo);text-decoration:none;color:var(--fg)}
.logo img{display:block;height:44px;width:auto;border-radius:8px;background:#fff;padding:2px}
.logo b{background:var(--amarelo);color:var(--tinta);padding:0 .22em;border-radius:.1em .3em .15em .3em}
nav{display:flex;gap:2px;flex-wrap:wrap;justify-content:flex-end}
nav a{padding:6px 12px;border-radius:8px;text-decoration:none;color:var(--fg);font-size:.93rem;font-weight:600}
nav a:hover{background:var(--tema2)}
nav a.on{background:var(--tinta);color:#fff}
@media(prefers-color-scheme:dark){nav a.on{background:var(--tema);color:#0f1626}}

/* herói */
.hero{position:relative;overflow:hidden;background-color:var(--tinta);color:#fff;
background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:28px 28px}
.hero-g{display:grid;grid-template-columns:1.05fr 1fr;gap:18px;align-items:center;padding-top:44px;padding-bottom:84px}
.hero h1{font-size:clamp(2.5rem,5.6vw,4.1rem);line-height:1.28;margin:.1em 0 .4em}
.hero h1 mark{padding:0 .14em .02em;line-height:1}
.hero .lead{font-size:1.18rem;max-width:32em;margin:0 0 26px;color:#dfe5f3}
.eyebrow{display:inline-block;font:1rem var(--mao);color:var(--amarelo);transform:rotate(-1.5deg)}
.hero-img{display:block;width:100%;height:auto}
.btns{display:flex;flex-wrap:wrap;gap:14px}
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:700;text-decoration:none;font-size:1.02rem;border:2px solid var(--tinta);transition:transform .12s,box-shadow .12s}
.btn:hover{transform:translate(-2px,-2px)}
.btn.p{background:var(--amarelo);color:var(--tinta);box-shadow:4px 4px 0 #fff}
.btn.p:hover{box-shadow:6px 6px 0 #fff}
.btn.s{background:transparent;color:#fff;border-color:#fff}
.btn.s:hover{background:rgba(255,255,255,.1)}
.btn.t{background:var(--capa);color:#fff;box-shadow:4px 4px 0 var(--tinta)}
@media(prefers-color-scheme:dark){.btn.t{box-shadow:4px 4px 0 #000}}

/* números */
.numeros{position:relative;z-index:2;display:grid;grid-template-columns:repeat(4,1fr);margin-top:-46px;background:var(--card);border:2px solid var(--tinta);border-radius:14px;box-shadow:var(--sombra2)}
@media(prefers-color-scheme:dark){.numeros{border-color:var(--bd2)}}
.numeros div{padding:16px 20px;border-left:2px dashed var(--bd2)}
.numeros div:first-child{border-left:0}
.numeros b{display:block;font:700 2rem/1.1 var(--titulo)}
.numeros span{color:var(--mut);font-size:.9rem}

main{padding:46px 0 72px}
.home main{padding-top:0}
.secao{margin-top:56px}
h2.sec{font-size:2rem;margin:0 0 4px}
p.sec{color:var(--mut);margin:0 0 24px;font-size:1.05rem}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));margin-bottom:34px}

/* cartões de disciplina */
.discs{display:grid;gap:24px;grid-template-columns:repeat(2,1fr)}
.disc{position:relative;display:flex;flex-direction:column;background:var(--card);border:2px solid var(--tinta);border-radius:14px;text-decoration:none;color:var(--fg);box-shadow:var(--sombra2);overflow:hidden;transition:transform .14s,box-shadow .14s}
@media(prefers-color-scheme:dark){.disc{border-color:var(--bd2)}}
.disc:hover{transform:translate(-3px,-3px);box-shadow:9px 9px 0 rgba(20,33,61,.16)}
.disc .capa{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;border-bottom:2px solid var(--tinta)}
.disc .txt{display:flex;flex-direction:column;gap:6px;padding:18px 20px 20px;flex:1}
.disc h3{margin:0;font-size:1.55rem}
.disc p{margin:0;color:var(--mut)}
.disc .meta{margin-top:auto;padding-top:12px;display:flex;justify-content:space-between;gap:10px;font-size:.92rem;font-weight:700;color:var(--tema)}
.tag{position:absolute;right:12px;top:12px;background:var(--amarelo);color:var(--tinta);font-size:.76rem;font-weight:800;padding:3px 10px;border-radius:6px;border:2px solid var(--tinta);transform:rotate(2deg)}

/* como funciona */
.passos{display:grid;gap:18px;grid-template-columns:repeat(3,1fr)}
.passo{background:var(--card);border:1px solid var(--bd);border-radius:14px;padding:20px;box-shadow:var(--sombra)}
.passo img{display:block;width:92px;height:92px;margin-bottom:10px}
.passo b{display:block;font:700 1.25rem var(--titulo);margin-bottom:2px}
.passo span{color:var(--mut)}

/* faixa final */
.faixa{margin-top:60px;display:flex;flex-wrap:wrap;gap:16px 28px;align-items:center;justify-content:space-between;background:var(--amarelo);color:var(--tinta);border:2px solid var(--tinta);border-radius:14px;padding:24px 28px;box-shadow:var(--sombra2)}
.faixa h2{margin:0;font-size:1.7rem}
.faixa p{margin:2px 0 0}
.faixa .btn{background:var(--tinta);color:#fff;box-shadow:none}

/* cabeçalho das páginas interiores */
.topo{position:relative;overflow:hidden;background:var(--capa);color:#fff;border-bottom:2px solid var(--tinta)}
.topo .wrap{position:relative;padding-top:32px;padding-bottom:30px}
.topo .fundo{position:absolute;right:0;top:0;height:100%;width:38%;object-fit:cover;object-position:right center;-webkit-mask-image:linear-gradient(90deg,transparent,#000 45%);mask-image:linear-gradient(90deg,transparent,#000 45%)}
.topo .cr{font-size:.9rem;margin-bottom:8px}
.topo .cr a{color:#fff}
.topo code{font:700 .78rem system-ui;background:rgba(255,255,255,.18);padding:2px 8px;border-radius:6px;margin-left:6px}
.topo h1{margin:0 0 6px;font-size:clamp(1.9rem,3.6vw,2.7rem);max-width:66%}
.topo p{margin:0;max-width:66%;color:rgba(255,255,255,.92)}
.stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.stat{background:rgba(0,0,0,.2);border-radius:10px;padding:6px 14px}
.stat b{font:700 1.2rem var(--titulo);margin-right:6px}
.stat span{font-size:.86rem}

/* cartões de tema */
.mod{display:flex;flex-direction:column;gap:7px;background:var(--card);border:1px solid var(--bd);border-top:5px solid var(--tema);border-radius:10px;padding:14px 16px;text-decoration:none;color:var(--fg);box-shadow:var(--sombra);transition:transform .12s,box-shadow .12s}
.mod:hover{transform:translate(-2px,-2px);box-shadow:var(--sombra2)}
.mod b{font:700 1.14rem/1.25 var(--titulo)}
.mod small{color:var(--mut);margin-top:auto}
.mod code{font:700 .74rem system-ui;color:var(--tema);background:var(--tema2);padding:2px 8px;border-radius:6px;align-self:flex-start}
.prog{display:block;height:7px;border-radius:99px;background:var(--bd);overflow:hidden}
.prog i{display:block;height:100%;width:0;background:var(--ok);border-radius:99px;transition:width .3s}
h2.grp{font-size:1.45rem;margin:30px 0 14px}
h2.grp:first-child{margin-top:0}

/* barra de filtros */
.barra{position:sticky;top:64px;z-index:10;background:var(--card);border-bottom:1px solid var(--bd)}
.barra .wrap{display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center;padding-top:9px;padding-bottom:9px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips button{font:inherit;font-size:.84rem;font-weight:600;border:1px solid var(--bd2);background:transparent;color:var(--fg);padding:4px 11px;border-radius:7px;cursor:pointer}
.chips button:hover{background:var(--tema2)}
.chips button[aria-pressed=true]{background:var(--capa);border-color:var(--capa);color:#fff}
.prog2{margin-left:auto;display:flex;align-items:center;gap:10px;font-size:.85rem;font-weight:700;color:var(--mut)}
.prog2 .prog{width:110px}

details.form{max-width:860px;background:var(--card);border:1px solid var(--bd);border-radius:10px;padding:12px 16px;margin:0 auto 22px;box-shadow:var(--sombra)}
details.form summary{cursor:pointer;font-weight:700;color:var(--tema)}
details.form .caixa{margin-top:8px;font-size:.95rem}

/* exercício: folha de caderno com margem */
.ex{position:relative;max-width:860px;margin:0 auto 20px;background:var(--card);border:1px solid var(--bd);border-radius:10px;padding:18px 22px 16px 48px;box-shadow:var(--sombra);
background-image:linear-gradient(90deg,transparent 33px,rgba(239,111,82,.5) 33px,rgba(239,111,82,.5) 35px,transparent 35px)}
.ex.ok{background-color:color-mix(in srgb,var(--ok) 7%,var(--card))}
.ex .cab{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;margin-bottom:2px}
.ex .num{position:absolute;left:-1px;top:16px;display:grid;place-items:center;min-width:30px;height:30px;padding:0 5px;border-radius:0 8px 8px 0;background:var(--capa);color:#fff;font-weight:800;font-size:.86rem}
.ex.ok .num{background:var(--ok)}
.ex h2{font-size:1.2rem;margin:0}
.estr{color:#e0a100;letter-spacing:1px}
.sel{font-size:.74rem;font-weight:700;padding:2px 9px;border-radius:6px}
.sel.iave{background:#e3e9fb;color:#23409f}.sel.editora{background:#ffefc2;color:#7a5200}.sel.original{background:#d9f2e6;color:#0d6b47}
@media(prefers-color-scheme:dark){.sel.iave{background:#1e2a52;color:#a9bdff}.sel.editora{background:#3a2c0b;color:#ffcf70}.sel.original{background:#0f3326;color:#7be3b3}}
.ex .ref{color:var(--mut);font-size:.86rem;margin:2px 0 10px}
.ex p{margin:.55em 0}
.ex p.opcao{margin:.2em 0 .2em 1.1em}
.ex img{max-width:100%;height:auto;background:#fff;border-radius:6px;display:block;margin:10px auto}
.tabela{overflow-x:auto;margin:14px 0}
.tabela table{border-collapse:collapse;margin:0 auto;min-width:45%;font-size:.97rem}
.tabela td,.tabela th{border:1px solid var(--bd2);padding:6px 14px;text-align:center}
.tabela tr:first-child td,.tabela th{background:var(--tema2);font-weight:700}
.rod{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:8px;margin-top:12px;padding-top:10px;border-top:1px dashed var(--bd2)}
details.res{flex:1 1 320px}
details.res summary{display:inline-block;cursor:pointer;list-style:none;background:var(--amarelo);color:var(--tinta);font-weight:700;padding:6px 14px;border-radius:7px;font-size:.92rem}
details.res summary::-webkit-details-marker{display:none}
details.res[open] summary{margin-bottom:10px}
details.res .corpo{background:var(--tema2);border-radius:8px;padding:6px 16px}
label.feito{display:flex;align-items:center;gap:8px;font-size:.9rem;font-weight:600;color:var(--mut);cursor:pointer;padding:6px 4px}
label.feito input{width:18px;height:18px;accent-color:var(--ok)}
.caixa{background:var(--tema2);border-radius:8px;padding:8px 14px;margin:0 0 8px}

.rel{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;max-width:860px;margin:28px auto 0}
.rel a{padding:9px 16px;border-radius:9px;background:var(--card);border:1px solid var(--bd);color:var(--tema);font-weight:700;text-decoration:none;box-shadow:var(--sombra)}
.rel a:hover{border-color:var(--tema)}

/* em breve */
.breve-box{background:var(--card);border:2px dashed var(--bd2);border-radius:14px;padding:30px;text-align:center;max-width:640px;margin:0 auto}
.breve-box img{display:block;width:100%;border-radius:10px;margin-bottom:18px}
.breve-box ul{display:inline-block;text-align:left;color:var(--mut);margin:6px 0 20px}

.legal{max-width:720px}
.legal h1{font-size:2.3rem}
.sub{color:var(--mut);margin:0 0 22px}

footer{background:var(--tinta);color:#c8d0e2;font-size:.9rem;padding:28px 0}
footer .wrap{display:flex;gap:18px;align-items:flex-start}
footer img{flex:none;height:54px;width:auto;border-radius:8px;background:#fff;padding:3px}
footer a{color:#fff}
footer p{margin:0 0 6px}
mjx-container{overflow-x:auto;overflow-y:hidden;max-width:100%}

@media(max-width:820px){
  .hero-g{grid-template-columns:1fr;padding-top:30px}
  .hero-img{max-width:430px;margin:0 auto}
  .discs,.passos{grid-template-columns:1fr}
  .numeros{grid-template-columns:repeat(2,1fr)}
  .numeros div:nth-child(3){border-left:0}
  .numeros div:nth-child(n+3){border-top:2px dashed var(--bd2)}
  .topo .fundo{width:70%;opacity:.3}
  .topo h1,.topo p{max-width:none}
}
@media(max-width:560px){
  header.top .wrap{height:auto;min-height:62px;padding-top:6px;padding-bottom:6px;flex-wrap:wrap}
  .logo{font-size:1.08rem}
  nav a{padding:4px 8px;font-size:.85rem}
  .barra{position:static}
  .prog2{margin-left:0;width:100%}
  .prog2 .prog{flex:1}
  .ex{padding:16px 14px 14px 42px}
  h2.sec{font-size:1.7rem}
  footer .wrap{flex-direction:column}
}