/* ====================== TOKENS ====================== */
:root{
  --blue:#2563EB; --blue-bright:#3b82f6; --blue-soft:#60a5fa;
  --purple:#8b5cf6; --purple-soft:#a78bfa; --green:#10b981;
  --font:"Inter",system-ui,-apple-system,sans-serif;
  --font-display:"Space Grotesk",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --maxw:1180px; --r:16px; --r-sm:11px; --r-lg:22px;
  --ease:cubic-bezier(.2,.7,.2,1);
}
:root[data-theme="dark"]{
  --bg:#09090f; --bg-2:#0b0b13; --card:#101019; --card-2:#15151f;
  --line:#20202c; --line-2:#2c2c3a; --text:#f4f4f7; --muted:#9a9aac; --muted-2:#62626f;
  --illu:rgba(255,255,255,.7); --illu-dim:rgba(255,255,255,.4);
  --glow-a:rgba(37,99,235,.20); --glow-b:rgba(139,92,246,.16);
  --header-bg:rgba(9,9,15,.72);
}
:root[data-theme="light"]{
  --bg:#f6f7fb; --bg-2:#eef0f6; --card:#ffffff; --card-2:#f6f7fb;
  --line:#e6e7ef; --line-2:#d7d8e3; --text:#15161d; --muted:#5b5c69; --muted-2:#9092a0;
  --illu:rgba(20,22,34,.72); --illu-dim:rgba(20,22,34,.4);
  --glow-a:rgba(37,99,235,.12); --glow-b:rgba(139,92,246,.10);
  --header-bg:rgba(246,247,251,.78);
}

/* ====================== RESET ====================== */
*,*::before,*::after{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font); background:var(--bg); color:var(--text);
  line-height:1.6; font-size:16px; -webkit-font-smoothing:antialiased;
  transition:background .3s var(--ease), color .3s var(--ease);
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
:focus-visible{outline:2px solid var(--blue-soft);outline-offset:3px;border-radius:5px}
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:24px}

/* ====================== BUTTONS ====================== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 22px;border-radius:var(--r-sm);font-weight:600;font-size:15px;
  border:1px solid transparent;transition:transform .15s var(--ease),background .2s,border-color .2s,box-shadow .2s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn svg{width:17px;height:17px}
.btn--primary{background:var(--blue);color:#fff}
.btn--primary:hover{background:#1d51d6;box-shadow:0 12px 34px -12px rgba(37,99,235,.8)}
.btn--purple{background:var(--purple);color:#fff}
.btn--purple:hover{background:#7c45f0;box-shadow:0 12px 34px -12px rgba(139,92,246,.8)}
.btn--ghost{background:transparent;color:var(--text);border-color:var(--line-2)}
.btn--ghost:hover{background:var(--card-2);border-color:var(--muted-2)}
.btn--block{width:100%}
.hdr .btn{padding:10px 18px;font-size:14px}

/* ====================== HEADER ====================== */
.hdr{position:sticky;top:0;z-index:60;background:var(--header-bg);
  backdrop-filter:saturate(150%) blur(14px);border-bottom:1px solid var(--line)}
.hdr .container{display:flex;align-items:center;justify-content:space-between;height:74px;gap:24px}
.brand{display:inline-flex;align-items:center;gap:11px;font-weight:700;font-size:20px;letter-spacing:-.02em}
.brand__logo{width:38px;height:38px;flex:none}
.nav{display:flex;align-items:center;gap:6px;flex:1;justify-content:center}
.nav a{padding:9px 15px;border-radius:9px;color:var(--muted);font-size:15px;font-weight:500;transition:color .15s,background .15s}
.nav a:hover{color:var(--text);background:var(--card-2)}
.hdr__right{display:flex;align-items:center;gap:12px}
.theme-toggle{width:42px;height:42px;border-radius:11px;border:1px solid var(--line-2);
  display:grid;place-items:center;color:var(--muted);transition:.2s}
.theme-toggle:hover{color:var(--text);border-color:var(--muted-2)}
.theme-toggle .sun{display:none}
:root[data-theme="light"] .theme-toggle .sun{display:block}
:root[data-theme="light"] .theme-toggle .moon{display:none}
.nav-toggle{display:none}

/* ====================== HERO ====================== */
.hero{position:relative;padding:64px 0 40px;overflow:hidden}
.hero::before{content:"";position:absolute;top:-180px;right:-160px;width:760px;height:760px;
  background:radial-gradient(circle at center, var(--glow-a), transparent 60%);pointer-events:none;z-index:0}
.hero::after{content:"";position:absolute;top:80px;right:120px;width:520px;height:520px;
  background:radial-gradient(circle at center, var(--glow-b), transparent 62%);pointer-events:none;z-index:0}
.hero .container{position:relative;z-index:1;display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}

.badge{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:11.5px;
  letter-spacing:.14em;text-transform:uppercase;color:var(--blue-soft);
  background:rgba(37,99,235,.10);border:1px solid rgba(37,99,235,.30);
  border-radius:999px;padding:7px 15px}
.badge svg{width:13px;height:13px}
.hero h1{font-size:clamp(2.5rem,5.4vw,3.9rem);line-height:1.05;letter-spacing:-.035em;font-weight:700;margin:24px 0 22px}
.hero h1 .accent{color:var(--blue-bright)}
.hero__desc{color:var(--muted);font-size:1.14rem;max-width:30rem}
.hero__cta{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}

/* ----- ilustração matemática (assinatura) ----- */
.illu{position:relative;width:100%;aspect-ratio:1/1;max-width:560px;margin-left:auto}
.illu>svg{position:absolute;inset:0;width:100%;height:100%}
.illu .formula{position:absolute;color:var(--text);white-space:nowrap}
.illu .f-integral{top:9%;left:60%;font-size:1.5rem}
.illu .f-matrix{top:42%;left:64%;font-size:1.25rem}
.illu .f-pyth{top:84%;left:60%;font-size:1.35rem}
.illu .axis-label{font-family:var(--mono);font-size:.85rem;fill:var(--illu)}
.sig-curve{stroke-dasharray:520;stroke-dashoffset:520;animation:draw 1.9s var(--ease) .3s forwards}
@keyframes draw{to{stroke-dashoffset:0}}
.twinkle{animation:tw 3s ease-in-out infinite}
.twinkle.b{animation-delay:-1.5s}.twinkle.c{animation-delay:-2.2s}
@keyframes tw{0%,100%{opacity:.25}50%{opacity:.8}}

/* ====================== SECTION SHELL ====================== */
.section{padding:60px 0;position:relative}
.section__title{font-size:clamp(1.7rem,3vw,2.1rem);font-weight:700;letter-spacing:-.025em}

/* ----- cartões de caminho ----- */
.paths{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.pcard{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:34px;overflow:hidden;transition:transform .2s var(--ease),border-color .2s,background .2s}
.pcard:hover{transform:translateY(-4px);border-color:var(--line-2);background:var(--card-2)}
.pcard__head{display:flex;align-items:center;gap:18px;margin-bottom:18px}
.pcard__icon{width:60px;height:60px;border-radius:16px;display:grid;place-items:center;flex:none}
.pcard__icon svg{width:28px;height:28px}
.pcard--blue .pcard__icon{background:rgba(37,99,235,.14);color:var(--blue-soft)}
.pcard--purple .pcard__icon{background:rgba(139,92,246,.14);color:var(--purple-soft)}
.pcard__head h3{font-size:1.45rem;font-weight:700;letter-spacing:-.02em;margin-bottom:4px}
.pcard__head p{color:var(--muted);font-size:.96rem;line-height:1.45}
.pcard ul{list-style:none;padding:0;display:grid;gap:13px;margin:22px 0 26px;max-width:62%}
.pcard li{display:flex;align-items:center;gap:11px;color:var(--text);font-size:1rem}
.pcard li svg{width:20px;height:20px;flex:none}
.pcard--blue li svg{color:var(--blue-soft)}
.pcard--purple li svg{color:var(--purple-soft)}
.pcard__link{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:.98rem}
.pcard--blue .pcard__link{color:var(--blue-soft)}
.pcard--purple .pcard__link{color:var(--purple-soft)}
.pcard__link svg{width:16px;height:16px}
.pcard__art{position:absolute;right:-10px;bottom:-10px;width:170px;height:170px;opacity:.14;pointer-events:none}
.pcard--blue .pcard__art{color:var(--blue-soft)}
.pcard--purple .pcard__art{color:var(--purple-soft)}

/* ----- conteúdos por assunto ----- */
.level{margin-top:34px}
.level__label{font-size:1.05rem;font-weight:700;letter-spacing:-.01em;margin-bottom:18px}
.level--em .level__label{color:var(--blue-bright)}
.level--grad .level__label{color:var(--purple)}
.subjects{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.scard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:24px 18px 20px;display:flex;flex-direction:column;align-items:center;gap:16px;
  transition:transform .18s var(--ease),border-color .18s,background .18s,box-shadow .18s}
.scard:hover{transform:translateY(-4px);border-color:var(--line-2);background:var(--card-2)}
.level--em .scard:hover{box-shadow:0 16px 40px -22px rgba(37,99,235,.7)}
.level--grad .scard:hover{box-shadow:0 16px 40px -22px rgba(139,92,246,.7)}
.scard__icon{height:46px;display:grid;place-items:center}
.scard__icon svg{width:42px;height:42px}
.scard__icon .katex{font-size:1.7rem}
.level--em .scard__icon{color:var(--blue-soft)}
.level--grad .scard__icon{color:var(--purple-soft)}
.scard__name{font-size:.96rem;font-weight:500;text-align:center;line-height:1.25}
.subjects-cta{display:flex;justify-content:center;margin-top:34px}

/* ----- banco + materiais ----- */
.bankrow{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.bigcard{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:34px;overflow:hidden;display:flex;flex-direction:column}
.bigcard h3{font-size:1.5rem;font-weight:700;letter-spacing:-.02em;margin-bottom:12px}
.bigcard p{color:var(--muted);max-width:75%;margin-bottom:24px}
.bigcard__art{position:absolute;top:24px;right:24px;width:96px;height:96px;opacity:.16;pointer-events:none;color:var(--muted)}
.filters{display:flex;flex-wrap:wrap;gap:11px;margin-bottom:26px;margin-top:auto}
.filter{display:inline-flex;align-items:center;gap:10px;background:var(--bg-2);border:1px solid var(--line-2);
  border-radius:9px;padding:10px 15px;font-size:.92rem;color:var(--text)}
.filter svg{width:13px;height:13px;color:var(--muted)}
.tags{display:flex;flex-wrap:wrap;gap:11px;margin-bottom:26px;margin-top:auto}
.tag{background:var(--bg-2);border:1px solid var(--line-2);border-radius:9px;padding:10px 16px;font-size:.92rem;color:var(--text)}

/* ====================== FOOTER ====================== */
.footer{border-top:1px solid var(--line);margin-top:50px;padding:56px 0 30px;background:var(--bg-2)}
.footer__grid{display:grid;grid-template-columns:1.6fr repeat(3,1fr) 1.2fr;gap:36px}
.footer__brand p{color:var(--muted);font-size:.94rem;max-width:18rem;margin:14px 0 20px}
.socials{display:flex;gap:11px}
.socials a{width:38px;height:38px;border-radius:10px;border:1px solid var(--line-2);display:grid;place-items:center;color:var(--muted);transition:.2s}
.socials a:hover{color:var(--text);border-color:var(--muted-2)}
.socials svg{width:18px;height:18px}
.fcol h4{font-size:.95rem;font-weight:700;margin-bottom:16px}
.fcol ul{list-style:none;padding:0;display:grid;gap:11px}
.fcol a{color:var(--muted);font-size:.93rem;transition:color .15s}
.fcol a:hover{color:var(--text)}
.fcol--contact p{color:var(--muted);font-size:.93rem;margin-bottom:14px;line-height:1.4}
.footer__bottom{margin-top:46px;padding-top:24px;border-top:1px solid var(--line);text-align:center;
  color:var(--muted-2);font-size:.85rem}

/* ====================== REVEAL / MOTION ====================== */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.vis{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}.sig-curve{stroke-dashoffset:0}
}

/* ====================== AUTENTICAÇÃO (SPLIT-SCREEN) ====================== */
.auth{display:grid;grid-template-columns:1.05fr .95fr;min-height:calc(100vh - 74px)}
.auth__aside{position:relative;overflow:hidden;padding:46px 48px;display:flex;flex-direction:column;
  background:linear-gradient(160deg, #0d1430, #0a0a14 62%);border-right:1px solid var(--line)}
:root[data-theme="light"] .auth__aside{background:linear-gradient(160deg, #e9eeff, #f6f7fb 62%)}
.auth__aside::before{content:"";position:absolute;top:-160px;right:-120px;width:520px;height:520px;
  background:radial-gradient(circle, rgba(37,99,235,.3), transparent 60%);pointer-events:none}
.auth__aside::after{content:"";position:absolute;bottom:-180px;left:-130px;width:540px;height:540px;
  background:radial-gradient(circle, rgba(139,92,246,.22), transparent 62%);pointer-events:none}
.auth__aside-grid{position:absolute;inset:0;pointer-events:none;opacity:.6;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px, transparent 1px);
  background-size:40px 40px}
:root[data-theme="light"] .auth__aside-grid{background-image:linear-gradient(rgba(20,22,34,.05) 1px, transparent 1px),linear-gradient(90deg,rgba(20,22,34,.05) 1px, transparent 1px)}
.auth__aside .brand{position:relative;z-index:2;color:#fff}
:root[data-theme="light"] .auth__aside .brand{color:var(--text)}
.aside-body{position:relative;z-index:2;margin:auto 0}
.aside-body h2{font-size:clamp(1.9rem,2.7vw,2.6rem);font-weight:700;letter-spacing:-.035em;line-height:1.08;margin-bottom:18px;color:#fff}
:root[data-theme="light"] .aside-body h2{color:var(--text)}
.aside-body h2 .accent{color:var(--blue-bright)}
.aside-body>p{color:var(--muted);font-size:1.06rem;max-width:25rem;margin-bottom:30px}
.aside-feats{list-style:none;padding:0;display:grid;gap:15px}
.aside-feats li{display:flex;align-items:center;gap:13px;font-size:1.02rem}
.aside-feats svg{width:22px;height:22px;color:var(--blue-soft);flex:none}
.aside-formula{position:absolute;z-index:1;color:var(--illu-dim);user-select:none}
.aside-formula.f1{top:16%;right:8%;font-size:1.7rem}
.aside-formula.f2{bottom:12%;right:13%;font-size:1.35rem}
.auth__main{display:grid;place-items:center;padding:48px 24px}
.auth-card{width:100%;max-width:404px}
.auth-card__brand{display:none;justify-content:center;margin-bottom:24px}
.auth-card__head{margin-bottom:26px}
.auth-card__head h1{font-size:1.8rem;font-weight:700;letter-spacing:-.03em;margin-bottom:7px}
.auth-card__head p{color:var(--muted);font-size:.97rem}

/* ----- FORMULÁRIOS ----- */
.field{margin-bottom:17px}
.field label{display:block;font-size:.88rem;font-weight:500;margin-bottom:8px}
.input-wrap{position:relative;display:flex;align-items:center}
.input-ic{position:absolute;left:14px;width:18px;height:18px;color:var(--muted-2);pointer-events:none}
.field input{width:100%;padding:13px 14px 13px 44px;background:var(--bg-2);border:1px solid var(--line-2);
  border-radius:var(--r-sm);color:var(--text);font-size:.97rem;font-family:inherit;
  transition:border-color .15s,box-shadow .15s,background .15s}
.field input::placeholder{color:var(--muted-2)}
.field input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.18);background:var(--card)}
.input-wrap.has-pw input{padding-right:46px}
.field__hint{display:block;margin-top:7px;font-size:.82rem;color:var(--muted-2)}
.pw-toggle{position:absolute;right:7px;width:32px;height:32px;display:grid;place-items:center;border-radius:8px;color:var(--muted-2);transition:.15s}
.pw-toggle:hover{color:var(--text);background:var(--card-2)}
.pw-toggle svg{width:18px;height:18px}
.pw-toggle.is-on{color:var(--blue-soft)}
.field-row{display:flex;justify-content:flex-end;margin:-6px 0 16px}
.field-row a{font-size:.86rem;color:var(--blue-soft)}
.field-row a:hover{text-decoration:underline}
.auth-card .btn--block{margin-top:6px;padding:13px}
.auth-foot{text-align:center;color:var(--muted);font-size:.92rem;margin-top:24px}
.auth-foot a{color:var(--blue-soft);font-weight:600}
.auth-foot a:hover{text-decoration:underline}

/* ----- ALERTAS ----- */
.alert{border-radius:var(--r-sm);padding:13px 16px;font-size:.92rem;line-height:1.45}
.alert--err{background:rgba(239,68,68,.10);border:1px solid rgba(239,68,68,.35);color:#f7a8a8}
.alert--ok{background:rgba(16,185,129,.10);border:1px solid rgba(16,185,129,.35);color:#6ee7b7}
.alert div+div{margin-top:4px}
.flash-wrap{margin-top:24px;display:grid;gap:10px}

/* ====================== PAINEL DO USUÁRIO ====================== */
.panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:34px;flex-wrap:wrap}
.panel-title{font-size:clamp(1.7rem,3vw,2.2rem);font-weight:700;letter-spacing:-.025em;margin:16px 0 6px}
.panel-sub{color:var(--muted);font-family:var(--mono);font-size:.9rem}
.panel-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.panel-grid .pcard{padding:26px}

/* ====================== PÁGINAS INTERNAS (stubs) ====================== */
.page-hero{position:relative;padding:96px 0 88px;text-align:center;overflow:hidden}
.page-hero::before{content:"";position:absolute;top:-160px;left:50%;transform:translateX(-50%);
  width:680px;height:680px;background:radial-gradient(circle at center,var(--glow-a),transparent 60%);pointer-events:none}
.page-hero .container{position:relative;z-index:1}
.page-hero .badge{margin-bottom:18px}
.page-hero h1{font-size:clamp(2rem,4vw,2.9rem);font-weight:700;letter-spacing:-.03em;margin:0 0 14px}
.page-hero p{color:var(--muted);max-width:34rem;margin:0 auto 26px;font-size:1.08rem}

/* ====================== RESPONSIVE ====================== */
@media (max-width:980px){
  .hero .container{grid-template-columns:1fr;gap:30px}
  .illu{max-width:460px;margin-inline:auto}
  .paths,.bankrow{grid-template-columns:1fr}
  .subjects{grid-template-columns:repeat(3,1fr)}
  .footer__grid{grid-template-columns:1fr 1fr;gap:30px}
  .footer__brand,.fcol--contact{grid-column:1/-1}
  .pcard ul,.bigcard p{max-width:none}
}
@media (max-width:860px){
  .auth{grid-template-columns:1fr}
  .auth__aside{display:none}
  .auth-card__brand{display:flex}
}
@media (max-width:680px){
  .nav{display:none}.hdr .btn--ghost{display:none}
  .nav-toggle{display:grid;place-items:center;width:42px;height:42px;border-radius:11px;border:1px solid var(--line-2);color:var(--text)}
  .nav.open{display:flex;flex-direction:column;align-items:stretch;position:absolute;top:74px;left:0;right:0;
    background:var(--bg);border-bottom:1px solid var(--line);padding:14px 24px;gap:2px;z-index:55}
  .subjects{grid-template-columns:repeat(2,1fr)}
  .hero{padding:44px 0 24px}.section{padding:46px 0}
  .panel-grid{grid-template-columns:1fr}
}
@media (max-width:440px){
  .footer__grid{grid-template-columns:1fr}
  .subjects{grid-template-columns:repeat(2,1fr)}
  .container{padding-inline:18px}
  .auth__aside{padding:32px 24px}
}
/* ============================================================
   FOCO VISÍVEL — acessibilidade por teclado
   ============================================================ */
:focus-visible {
  outline: 2px solid var(--blue-soft);
  outline-offset: 3px;
  border-radius: 4px;
}
/* Remover outline padrão feio do browser apenas quando não é teclado */
:focus:not(:focus-visible) {
  outline: none;
}
/* Inputs e textareas com foco */
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--blue-soft);
  outline-offset: 0;
  border-color: var(--blue-soft) !important;
}
/* Botões */
.btn:focus-visible {
  outline: 2px solid var(--blue-soft);
  outline-offset: 3px;
}
/* Links de nav */
.nav a:focus-visible,
.brand:focus-visible {
  outline: 2px solid var(--blue-soft);
  outline-offset: 4px;
  border-radius: 6px;
}

/* ============================================================
   IMPRESSÃO — @media print
   Usado em: questoes/resolver.php, questoes/ver.php
   ============================================================ */
@media print {
  /* Ocultar elementos de navegação e UI */
  .hdr,
  .footer,
  .nav,
  .nav-toggle,
  .theme-toggle,
  .btn,
  .alert,
  .flash-wrap,
  form,
  [class*="painel-card"],
  [id="themeToggle"],
  [id="navToggle"] {
    display: none !important;
  }

  /* Resetar cores para impressão */
  body {
    background: #fff !important;
    color: #000 !important;
    font-family: 'Times New Roman', Times, serif !important;
    font-size: 11pt !important;
  }

  /* Remover sombras e bordas decorativas */
  * {
    box-shadow: none !important;
    text-shadow: none !important;
    background: transparent !important;
    color: #000 !important;
  }

  /* Manter bordas de cards mas simples */
  [style*="var(--card)"],
  [style*="background:var(--card)"] {
    border: 1px solid #ccc !important;
  }

  /* Links — mostrar URL ou remover sublinhado */
  a { text-decoration: none !important; color: #000 !important; }

  /* Evitar quebra de página dentro de questões */
  .questao-card,
  [id^="q"] {
    page-break-inside: avoid !important;
    break-inside: avoid !important;
  }

  /* Padding da section sem espaço excessivo */
  .section { padding: 8px 0 !important; }
  .container { padding-inline: 0 !important; max-width: 100% !important; }

  /* Ocultar barra de progresso e controles de sessão */
  [style*="height:6px"],
  [onclick*="finalizar"],
  [onclick*="verResolucao"] {
    display: none !important;
  }

  /* Garantir que LaTeX renderize corretamente */
  mjx-container {
    color: #000 !important;
    font-weight: normal !important;
  }

  /* Rodapé de impressão */
  main::after {
    content: "MateMax — " attr(data-url);
    display: block;
    margin-top: 24px;
    font-size: 9pt;
    color: #666 !important;
    border-top: 1px solid #ccc;
    padding-top: 6px;
  }
}