/* ==========================================================================
   Compilado — preparação para concursos de TI
   Sistema visual. Escuro por decisão de uso: sessões longas de leitura, muitas
   à noite. A marca é índigo; verde, vermelho e âmbar ficam reservados para
   significado (acertou, errou, atenção) e nunca para decoração.
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  /* Superfícies — azul-grafite, frio o bastante para não cansar */
  --bg:        #0b0e14;
  --surface-1: #11151d;
  --surface-2: #161b25;
  --surface-3: #1d2330;
  --surface-4: #262e3d;

  /* Papel — leitura longa da apostila */
  --paper:      #f7f3ec;
  --paper-2:    #efe9df;
  --paper-3:    #e2dace;
  --paper-ink:  #191714;
  --paper-ink-2:#4b453c;
  --paper-ink-3:#7d756a;

  /* Texto */
  --fg:   #e9edf5;
  --fg-2: #a8b2c4;
  --fg-3: #737f95;
  --fg-4: #4c566a;

  /* Marca */
  --brand:     #7c8cff;
  --brand-2:   #9aa6ff;
  --brand-dim: #3b447f;
  --brand-wash:rgba(124, 140, 255, 0.12);

  /* Semântica — só significado, nunca enfeite */
  --ok:    #4ec38a;
  --ok-bg: rgba(78, 195, 138, 0.13);
  --err:   #f2686b;
  --err-bg:rgba(242, 104, 107, 0.13);
  --warn:  #eaa94a;
  --warn-bg:rgba(234, 169, 74, 0.13);
  --info:  #58b6e8;
  --info-bg:rgba(88, 182, 232, 0.13);

  /* Linhas e elevação */
  --line:   rgba(233, 237, 245, 0.08);
  --line-2: rgba(233, 237, 245, 0.15);
  --line-paper:   rgba(25, 23, 20, 0.12);
  --line-paper-2: rgba(25, 23, 20, 0.24);

  --sh-1: 0 1px 2px rgba(0,0,0,.35), 0 2px 6px -2px rgba(0,0,0,.30);
  --sh-2: 0 4px 10px -2px rgba(0,0,0,.40), 0 12px 28px -8px rgba(0,0,0,.45);
  --sh-3: 0 10px 24px -6px rgba(0,0,0,.50), 0 30px 60px -20px rgba(0,0,0,.60);

  /* Tipografia */
  --f-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-ui:      "Schibsted Grotesk", "Segoe UI", system-ui, sans-serif;
  --f-read:    "Literata", Charter, Georgia, serif;
  --f-mono:    "IBM Plex Mono", "Cascadia Mono", Consolas, monospace;

  /* Métrica */
  --rail: 244px;
  --measure: 68ch;
  --r-sm: 8px;
  --r:    12px;
  --r-lg: 16px;
  --r-xl: 22px;
  --dur: 200ms;
  --ease: cubic-bezier(.2,.7,.3,1);
  --ease-out: cubic-bezier(.16,1,.3,1);

  --safe-b: env(safe-area-inset-bottom, 0px);
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--f-ui);
  font-size: 15px;
  line-height: 1.55;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; padding: 0; }
a { color: var(--brand-2); text-decoration-color: color-mix(in srgb, var(--brand-2) 40%, transparent); text-underline-offset: 3px; }
a:hover { color: var(--brand); }
img, svg { max-width: 100%; }
svg { display: block; }

/* superfícies do navegador vestidas pelo sistema, não pelo padrão do SO */
::selection { background: var(--brand); color: #0b0e14; }
::placeholder { color: var(--fg-4); }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: 4px; }
input, textarea { caret-color: var(--brand); }
.num, [class*="num"] { font-variant-numeric: tabular-nums; }

::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface-4); border: 3px solid var(--bg); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--fg-4); }
* { scrollbar-width: thin; scrollbar-color: var(--surface-4) transparent; }

/* ---------- 3. Utilitários ---------- */
.eyebrow {
  font-size: 11px; font-weight: 600; letter-spacing: .1em;
  text-transform: uppercase; color: var(--fg-3);
}
.mono { font-family: var(--f-mono); font-size: .92em; }
.sr {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- 4. Shell ---------- */
.app { display: grid; grid-template-columns: var(--rail) minmax(0,1fr); min-height: 100dvh; }

.rail {
  position: sticky; top: 0; height: 100dvh;
  display: flex; flex-direction: column;
  background: var(--surface-1);
  border-right: 1px solid var(--line);
  overflow-y: auto; overscroll-behavior: contain;
}

.brand { padding: 22px 20px 16px; }
.brand__link {
  display: flex; align-items: center; gap: 11px;
  text-decoration: none; color: var(--fg);
}
.brand__logo {
  width: 34px; height: 34px; flex: none; border-radius: 10px;
  background: linear-gradient(140deg, var(--brand), #5d6ae0);
  display: grid; place-items: center; color: #fff;
  box-shadow: 0 2px 8px -2px rgba(124,140,255,.5);
}
.brand__name {
  display: block;
  font-family: var(--f-display); font-size: 19px; font-weight: 700;
  letter-spacing: -.025em; line-height: 1.15;
}
.brand__sub { display: block; font-size: 11.5px; color: var(--fg-3); line-height: 1.2; margin-top: 1px; }

/* concurso em foco — contexto, não marca */
.foco {
  margin: 0 14px 14px; padding: 11px 13px;
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--r); display: block; text-decoration: none;
}
.foco__rot { font-size: 10.5px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--fg-3); }
.foco__nome { font-size: 13.5px; font-weight: 600; color: var(--fg); margin-top: 3px; }
.foco__meta { font-size: 11.5px; color: var(--fg-3); margin-top: 2px; }

.rail__group { padding: 4px 0 8px; }
.rail__label { padding: 8px 20px 6px; font-size: 10.5px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--fg-4); }

.navitem {
  position: relative; display: flex; align-items: center; gap: 12px;
  width: calc(100% - 16px); margin: 1px 8px; padding: 9px 12px;
  border-radius: var(--r-sm);
  font-size: 14px; font-weight: 500; color: var(--fg-2); text-align: left;
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.navitem:hover { color: var(--fg); background: var(--surface-2); }
.navitem[aria-current="true"] { color: var(--fg); background: var(--brand-wash); font-weight: 600; }
.navitem[aria-current="true"] .navitem__ico { color: var(--brand); }
.navitem__ico { width: 18px; height: 18px; flex: none; color: var(--fg-3); transition: color var(--dur) var(--ease); }
.navitem:hover .navitem__ico { color: var(--fg-2); }
.navitem__badge {
  margin-left: auto; min-width: 21px; padding: 1px 6px; border-radius: 99px;
  background: var(--surface-4); color: var(--fg-2);
  font-size: 11px; font-weight: 600; text-align: center; font-variant-numeric: tabular-nums;
}
.navitem__badge--hot { background: var(--brand); color: #0b0e14; }

.rail__foot { margin-top: auto; padding: 12px 14px calc(16px + var(--safe-b)); border-top: 1px solid var(--line); }

.conta { display: flex; align-items: center; gap: 10px; padding: 4px 2px 10px; }
.conta__av {
  width: 32px; height: 32px; border-radius: 10px; flex: none;
  background: var(--surface-3); border: 1px solid var(--line-2);
  display: grid; place-items: center;
  font-size: 13px; font-weight: 700; color: var(--brand-2);
}
.conta__nome { font-size: 13px; font-weight: 550; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conta__mail { font-size: 11px; color: var(--fg-4); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* --- área principal --- */
.main { min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 12px;
  padding: 0 clamp(16px, 3vw, 32px); height: 60px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--line);
}
.topbar__crumb { font-size: 13.5px; color: var(--fg-3); min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar__crumb b { color: var(--fg); font-weight: 600; }
.topbar__spacer { flex: 1; }

.status { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--fg-3); }
.status__dot { width: 7px; height: 7px; border-radius: 99px; background: var(--fg-4); flex: none; }
.status--ok .status__dot { background: var(--ok); }
.status--busy .status__dot { background: var(--warn); animation: pulsa 1.4s ease-in-out infinite; }
.status--off .status__dot { background: var(--err); }
@keyframes pulsa { 50% { opacity: .35; } }

.streak { display: inline-flex; align-items: center; gap: 5px; font-size: 12.5px; color: var(--warn); font-variant-numeric: tabular-nums; }

.view {
  flex: 1; width: 100%; max-width: 1180px;
  padding: clamp(20px, 3vw, 34px) clamp(16px, 3vw, 32px) 120px;
  animation: sobe 320ms var(--ease-out) both;
}
@keyframes sobe { from { opacity: 0; transform: translateY(8px); } }

/* --- navegação inferior no celular --- */
.tabbar { display: none; }

/* ---------- 5. Cabeçalho de página ---------- */
.phead { margin-bottom: 26px; }
.phead__title {
  margin: 0; font-family: var(--f-display);
  font-size: clamp(26px, 4.2vw, 36px); font-weight: 700;
  letter-spacing: -.03em; line-height: 1.1; color: var(--fg);
  text-wrap: balance;
}
.phead__title em { font-style: normal; color: var(--brand-2); }
.phead__sub { margin: 10px 0 0; max-width: 68ch; font-size: 14.5px; color: var(--fg-2); line-height: 1.6; }
.rule { height: 1px; background: var(--line); margin: 28px 0; border: 0; }

/* ---------- 6. Cartões ---------- */
.grid { display: grid; gap: 14px; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 176px), 1fr)); }

.card {
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 18px;
}
.card--pad-lg { padding: clamp(18px, 3vw, 26px); }
.card--link { text-decoration: none; color: inherit; display: block; transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease); }
.card--link:hover { border-color: var(--line-2); transform: translateY(-2px); box-shadow: var(--sh-2); color: inherit; }
.card__t { margin: 0 0 6px; font-size: 11px; font-weight: 600; letter-spacing: .09em; text-transform: uppercase; color: var(--fg-3); }

.stat { display: flex; flex-direction: column; gap: 3px; }
.stat__v {
  font-family: var(--f-display); font-size: clamp(28px, 4vw, 34px); font-weight: 700;
  line-height: 1; letter-spacing: -.03em; font-variant-numeric: tabular-nums; color: var(--fg);
}
.stat__v small { font-size: .46em; font-weight: 600; color: var(--fg-3); margin-left: 3px; letter-spacing: 0; }
.stat__d { font-size: 12.5px; color: var(--fg-3); line-height: 1.4; }
.stat--brand .stat__v { color: var(--brand-2); }
.stat--ok    .stat__v { color: var(--ok); }
.stat--warn  .stat__v { color: var(--warn); }
.stat--err   .stat__v { color: var(--err); }
.stat--info  .stat__v { color: var(--info); }

.bar { height: 6px; border-radius: 99px; background: var(--surface-3); overflow: hidden; }
/* scaleX em vez de width: a animação roda na GPU e não força layout. */
.bar > i {
  display: block; height: 100%; width: 100%; border-radius: 99px;
  background: var(--brand); transform-origin: left center;
  transition: transform 700ms var(--ease-out);
}
.bar--thin { height: 4px; }
.bar--ok > i { background: var(--ok); }
.bar--warn > i { background: var(--warn); }
.bar--err > i { background: var(--err); }

/* ---------- 7. Botões ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 40px; padding: 9px 17px;
  border-radius: var(--r-sm); border: 1px solid var(--line-2);
  background: var(--surface-2); color: var(--fg);
  font-size: 14px; font-weight: 550; text-decoration: none; white-space: nowrap;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform 90ms var(--ease);
}
.btn:hover { background: var(--surface-3); border-color: var(--fg-4); color: var(--fg); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .45; pointer-events: none; }
.btn svg { width: 17px; height: 17px; flex: none; }

.btn--primary { background: var(--brand); border-color: var(--brand); color: #0b0e14; font-weight: 650; box-shadow: 0 2px 10px -2px rgba(124,140,255,.45); }
.btn--primary:hover { background: var(--brand-2); border-color: var(--brand-2); color: #0b0e14; }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--fg-2); }
.btn--ghost:hover { background: var(--surface-2); color: var(--fg); }
.btn--danger { border-color: color-mix(in srgb, var(--err) 45%, transparent); color: var(--err); background: transparent; }
.btn--danger:hover { background: var(--err-bg); border-color: var(--err); color: var(--err); }
.btn--sm { min-height: 32px; padding: 5px 12px; font-size: 13px; }
.btn--lg { min-height: 48px; padding: 13px 24px; font-size: 15px; }
.btn--block { width: 100%; }
.btnrow { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  min-height: 32px; padding: 5px 13px; border-radius: 99px;
  border: 1px solid var(--line); background: transparent;
  font-size: 13px; color: var(--fg-2);
  transition: all var(--dur) var(--ease);
}
.chip:hover { border-color: var(--line-2); color: var(--fg); }
.chip[aria-pressed="true"] { background: var(--brand); border-color: var(--brand); color: #0b0e14; font-weight: 600; }

.tag {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 9px; border-radius: 99px;
  font-size: 11px; font-weight: 600; letter-spacing: .03em;
  background: var(--surface-3); color: var(--fg-2); border: 1px solid var(--line);
}
.tag--ok   { background: var(--ok-bg);   color: var(--ok);   border-color: color-mix(in srgb, var(--ok) 30%, transparent); }
.tag--err  { background: var(--err-bg);  color: var(--err);  border-color: color-mix(in srgb, var(--err) 30%, transparent); }
.tag--warn { background: var(--warn-bg); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }
.tag--info { background: var(--info-bg); color: var(--info); border-color: color-mix(in srgb, var(--info) 30%, transparent); }
.tag--brand{ background: var(--brand-wash); color: var(--brand-2); border-color: var(--brand-dim); }

/* ---------- 8. Trilha ---------- */
.track { position: relative; padding-left: 30px; }
.track::before { content: ""; position: absolute; left: 13px; top: 12px; bottom: 12px; width: 2px; background: var(--line-2); }
.stage { position: relative; margin-bottom: 32px; }
.stage__dot {
  position: absolute; left: -30px; top: 2px;
  width: 28px; height: 28px; border-radius: 99px;
  display: grid; place-items: center;
  background: var(--surface-2); border: 2px solid var(--surface-4);
  font-size: 12px; font-weight: 700; color: var(--fg-3); font-variant-numeric: tabular-nums;
}
.stage--done .stage__dot { background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }
.stage--now  .stage__dot { background: var(--brand-wash); border-color: var(--brand); color: var(--brand-2); box-shadow: 0 0 0 4px var(--brand-wash); }
.stage__h { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 4px; }
.stage__name { font-family: var(--f-display); font-size: 20px; font-weight: 700; letter-spacing: -.02em; }
.stage__meta { font-size: 12.5px; color: var(--fg-3); }
.stage__desc { font-size: 14px; color: var(--fg-2); max-width: 70ch; margin: 0 0 14px; line-height: 1.6; }

.modlist { display: grid; gap: 8px; }
.mod {
  display: grid; grid-template-columns: auto minmax(0,1fr) auto;
  align-items: center; gap: 13px;
  width: 100%; text-align: left; padding: 12px 15px;
  border: 1px solid var(--line); border-radius: var(--r);
  background: var(--surface-1); text-decoration: none; color: inherit;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.mod:hover { background: var(--surface-2); border-color: var(--line-2); transform: translateX(3px); color: inherit; }
.mod--done { background: color-mix(in srgb, var(--ok) 5%, var(--surface-1)); }
.mod__check {
  width: 20px; height: 20px; border-radius: 6px; flex: none;
  border: 1.5px solid var(--fg-4); display: grid; place-items: center; color: transparent;
}
.mod--done .mod__check { background: var(--ok); border-color: var(--ok); color: #0b0e14; }
.mod--started .mod__check { border-color: var(--brand); }
.mod__body { min-width: 0; }
.mod__name { font-size: 14.5px; font-weight: 550; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.mod__sub { font-size: 12px; color: var(--fg-3); margin-top: 2px; }
.mod__right { display: flex; align-items: center; gap: 10px; font-size: 12.5px; color: var(--fg-3); }

/* ---------- 9. Leitura ---------- */
.readshell { display: grid; grid-template-columns: minmax(0,1fr) 208px; gap: 32px; align-items: start; }
.toc { position: sticky; top: 78px; font-size: 13px; }
.toc a { display: block; padding: 5px 0 5px 12px; border-left: 2px solid var(--line); color: var(--fg-3); text-decoration: none; line-height: 1.35; }
.toc a:hover { color: var(--fg); border-left-color: var(--fg-4); }
.toc a.on { color: var(--brand-2); border-left-color: var(--brand); }

.paper {
  background: var(--paper); color: var(--paper-ink);
  border-radius: var(--r-lg); box-shadow: var(--sh-3);
  padding: clamp(24px, 5vw, 56px);
}
.prose { font-family: var(--f-read); font-size: 16.5px; line-height: 1.75; max-width: var(--measure); color: var(--paper-ink); }
.prose > * + * { margin-top: 1.05em; }
.prose h2 {
  font-family: var(--f-display); font-size: 1.55em; font-weight: 700; line-height: 1.18;
  letter-spacing: -.025em; margin-top: 1.9em; margin-bottom: .15em;
  padding-bottom: .3em; border-bottom: 1px solid var(--line-paper-2); text-wrap: balance;
}
.prose h3 { font-family: var(--f-display); font-size: 1.18em; font-weight: 700; line-height: 1.3; margin-top: 1.6em; margin-bottom: .05em; letter-spacing: -.015em; }
.prose h4 { font-family: var(--f-ui); font-size: .84em; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; margin-top: 1.5em; color: var(--paper-ink-2); }
.prose p { margin: 0; }
.prose strong { font-weight: 700; color: #0f0d0a; }
.prose ul, .prose ol { margin: 0; padding-left: 1.4em; }
.prose li + li { margin-top: .45em; }
.prose li::marker { color: var(--paper-ink-3); }
.prose a { color: #3f4fbf; text-decoration-color: rgba(63,79,191,.4); }
.prose a:hover { color: #2c3a9c; }
.prose hr { border: 0; border-top: 1px solid var(--line-paper); margin: 2.2em 0; }

.prose code {
  font-family: var(--f-mono); font-size: .855em;
  background: rgba(25,23,20,.07); border: 1px solid var(--line-paper);
  border-radius: 5px; padding: .1em .36em; white-space: nowrap;
}
.prose pre {
  font-family: var(--f-mono); font-size: 13px; line-height: 1.62;
  background: var(--surface-1); color: #dfe6f2;
  border-radius: var(--r); padding: 16px 18px; overflow-x: auto;
  max-width: none; border: 1px solid rgba(0,0,0,.35);
}
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; white-space: pre; color: inherit; }

.prose table { width: 100%; max-width: none; border-collapse: collapse; font-family: var(--f-ui); font-size: 13.5px; }
.prose thead th { text-align: left; padding: 9px 11px; border-bottom: 2px solid var(--line-paper-2); font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--paper-ink-2); }
.prose tbody td { padding: 9px 11px; border-bottom: 1px solid var(--line-paper); vertical-align: top; }
.prose tbody tr:nth-child(even) { background: rgba(25,23,20,.03); }
.tablewrap { overflow-x: auto; max-width: none; }

.cl {
  border: 1px solid var(--line-paper-2); border-radius: var(--r);
  background: rgba(25,23,20,.035); padding: 14px 18px; font-size: .95em; max-width: none;
}
.cl__h { font-family: var(--f-ui); font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 6px; }
.cl > *:last-child { margin-bottom: 0; }
.cl--pega    { background: rgba(198,72,60,.07);  border-color: rgba(198,72,60,.3); }
.cl--pega .cl__h    { color: #b2402f; }
.cl--chave   { background: rgba(150,110,20,.08); border-color: rgba(150,110,20,.3); }
.cl--chave .cl__h   { color: #866010; }
.cl--banca   { background: rgba(63,79,191,.06);  border-color: rgba(63,79,191,.28); }
.cl--banca .cl__h   { color: #3646a8; }
.cl--exemplo { background: rgba(30,110,90,.07);  border-color: rgba(30,110,90,.28); }
.cl--exemplo .cl__h { color: #1c6a55; }

/* ---------- 10. Questões ---------- */
.q { background: var(--surface-1); border: 1px solid var(--line); border-radius: var(--r-lg); padding: clamp(16px,3vw,24px); margin-bottom: 16px; }
.q__head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 14px; }
.q__n { font-family: var(--f-display); font-size: 15px; font-weight: 700; color: var(--fg-3); font-variant-numeric: tabular-nums; }
.q__stem { font-family: var(--f-read); font-size: 15.5px; line-height: 1.7; color: var(--fg); margin-bottom: 16px; }
.q__stem p + p { margin-top: .85em; }
.q__stem pre { font-family: var(--f-mono); font-size: 12.5px; line-height: 1.58; background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-sm); padding: 14px 16px; overflow-x: auto; color: #cfdcf0; }
.q__stem code { font-family: var(--f-mono); font-size: .88em; background: var(--surface-3); border-radius: 4px; padding: .1em .34em; }

.alts { display: grid; gap: 8px; }
.alt {
  display: grid; grid-template-columns: 28px minmax(0,1fr); gap: 12px;
  width: 100%; text-align: left; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: var(--r);
  background: var(--bg); font-size: 14.5px; line-height: 1.55; color: var(--fg-2);
  transition: border-color 140ms var(--ease), background 140ms var(--ease), color 140ms var(--ease);
}
.alt:hover:not([disabled]) { border-color: var(--fg-4); color: var(--fg); background: var(--surface-2); }
.alt__k {
  display: grid; place-items: center; width: 25px; height: 25px; border-radius: 7px;
  background: var(--surface-3); border: 1px solid var(--line-2);
  font-size: 12.5px; font-weight: 700; color: var(--fg-2);
}
.alt[aria-pressed="true"] { border-color: var(--brand); background: var(--brand-wash); color: var(--fg); }
.alt[aria-pressed="true"] .alt__k { background: var(--brand); border-color: var(--brand); color: #0b0e14; }
.alt--ok  { border-color: var(--ok) !important;  background: var(--ok-bg) !important;  color: var(--fg) !important; }
.alt--ok .alt__k  { background: var(--ok);  border-color: var(--ok);  color: #0b0e14; }
.alt--err { border-color: var(--err) !important; background: var(--err-bg) !important; }
.alt--err .alt__k { background: var(--err); border-color: var(--err); color: #0b0e14; }
.alt--null { opacity: .55; }

.feedback { margin-top: 16px; border: 1px solid var(--line); border-radius: var(--r); background: var(--bg); overflow: hidden; animation: sobe 200ms var(--ease-out) both; }
.feedback__bar { padding: 10px 16px; font-size: 13px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.feedback__bar svg { width: 16px; height: 16px; }
.feedback--ok .feedback__bar  { background: var(--ok-bg);  color: var(--ok); }
.feedback--err .feedback__bar { background: var(--err-bg); color: var(--err); }
.feedback__body { padding: 16px 18px; font-size: 14px; line-height: 1.68; color: var(--fg-2); }
.feedback__body strong { color: var(--fg); }
.feedback__sec + .feedback__sec { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.feedback__lab { font-size: 10.5px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--fg-3); margin-bottom: 5px; }
.altwhy { display: grid; gap: 6px; font-size: 13.5px; }
.altwhy > div { display: grid; grid-template-columns: 20px 1fr; gap: 8px; }
.altwhy b { color: var(--fg-3); font-variant-numeric: tabular-nums; }

/* ---------- 11. Flashcards ---------- */
.fcstage { display: grid; place-items: center; min-height: 320px; perspective: 1600px; }
.fc { width: min(660px,100%); min-height: 260px; position: relative; transform-style: preserve-3d; transition: transform 520ms var(--ease-out); cursor: pointer; }
.fc.flip { transform: rotateY(180deg); }
.fc__face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: flex; flex-direction: column; justify-content: center;
  padding: clamp(24px,5vw,38px); border-radius: var(--r-lg); box-shadow: var(--sh-3);
}
.fc__face--f { background: var(--surface-2); border: 1px solid var(--line-2); }
.fc__face--b { background: var(--paper); color: var(--paper-ink); transform: rotateY(180deg); overflow-y: auto; }
.fc__lab { position: absolute; top: 16px; left: 22px; font-size: 10.5px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.fc__face--f .fc__lab { color: var(--fg-4); }
.fc__face--b .fc__lab { color: var(--paper-ink-3); }
.fc__txt { font-family: var(--f-read); font-size: 19px; line-height: 1.55; }
.fc__face--b .fc__txt { font-size: 16.5px; }
.fc__hint { position: absolute; bottom: 16px; left: 0; right: 0; text-align: center; font-size: 11.5px; color: var(--fg-4); }
.fc__face--b .fc__hint { color: var(--paper-ink-3); }

.srsrow { display: grid; grid-template-columns: repeat(4,1fr); gap: 9px; margin-top: 22px; max-width: 660px; margin-inline: auto; }
.srsbtn {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  min-height: 52px; padding: 9px 8px; border-radius: var(--r-sm);
  border: 1px solid var(--line-2); background: var(--surface-2);
  font-size: 13.5px; font-weight: 600;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}
.srsbtn small { font-size: 10.5px; color: var(--fg-4); font-weight: 400; }
.srsbtn:hover { transform: translateY(-2px); }
.srsbtn--0 { color: var(--err); }   .srsbtn--0:hover { background: var(--err-bg); }
.srsbtn--1 { color: var(--warn); }  .srsbtn--1:hover { background: var(--warn-bg); }
.srsbtn--2 { color: var(--info); }  .srsbtn--2:hover { background: var(--info-bg); }
.srsbtn--3 { color: var(--ok); }    .srsbtn--3:hover { background: var(--ok-bg); }

/* ---------- 12. Simulado ---------- */
.simbar {
  position: sticky; top: 60px; z-index: 30;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 12px 16px; margin-bottom: 18px;
  background: var(--surface-1); border: 1px solid var(--line-2);
  border-radius: var(--r-lg); box-shadow: var(--sh-1);
}
.clock { font-family: var(--f-mono); font-size: 22px; font-weight: 500; font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.clock--warn { color: var(--warn); }
.clock--crit { color: var(--err); animation: pulsa 1.1s ease-in-out infinite; }

.qmap { display: flex; flex-wrap: wrap; gap: 5px; }
.qmap__b {
  width: 30px; height: 30px; border-radius: 7px;
  border: 1px solid var(--line); background: var(--bg);
  font-size: 11.5px; font-weight: 600; color: var(--fg-3); font-variant-numeric: tabular-nums;
  transition: all 120ms var(--ease);
}
.qmap__b:hover { border-color: var(--fg-4); color: var(--fg); }
.qmap__b--ans  { background: var(--surface-4); color: var(--fg); border-color: var(--line-2); }
.qmap__b--mark { border-color: var(--warn); color: var(--warn); }
.qmap__b--cur  { outline: 2px solid var(--brand); outline-offset: 1px; }
.qmap__b--ok   { background: var(--ok-bg);  border-color: var(--ok);  color: var(--ok); }
.qmap__b--err  { background: var(--err-bg); border-color: var(--err); color: var(--err); }

/* ---------- 13. Vídeos ---------- */
.vid {
  display: grid; grid-template-columns: 132px minmax(0,1fr); gap: 14px;
  padding: 12px; border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--surface-1); text-decoration: none; color: inherit;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.vid:hover { background: var(--surface-2); border-color: var(--line-2); transform: translateY(-2px); color: inherit; }
.vid__thumb { aspect-ratio: 16/9; border-radius: var(--r-sm); overflow: hidden; background: var(--bg); display: grid; place-items: center; position: relative; }
.vid__thumb img { width: 100%; height: 100%; object-fit: cover; }
.vid__play { position: absolute; width: 36px; height: 36px; border-radius: 99px; background: rgba(11,14,20,.8); display: grid; place-items: center; color: #fff; }
.vid__name { font-size: 14px; font-weight: 600; line-height: 1.35; }
.vid__meta { font-size: 12px; color: var(--fg-3); margin-top: 4px; }
.vid__why  { font-size: 13px; color: var(--fg-2); margin-top: 7px; line-height: 1.5; }

/* ---------- 14. Tabelas de dados ---------- */
.dtablewrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-lg); }
.dtable { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.dtable th { text-align: left; padding: 11px 13px; border-bottom: 1px solid var(--line-2); font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--fg-3); white-space: nowrap; }
.dtable td { padding: 11px 13px; border-bottom: 1px solid var(--line); color: var(--fg-2); vertical-align: middle; }
.dtable tr:last-child td { border-bottom: 0; }
.dtable tr:hover td { background: var(--surface-1); }
.dtable td b { color: var(--fg); font-weight: 600; }

/* ---------- 15. Formulários ---------- */
.field { display: grid; gap: 6px; }
.field > label { font-size: 12px; font-weight: 600; letter-spacing: .04em; color: var(--fg-2); }
.input, select.input, textarea.input {
  width: 100%; min-height: 44px; padding: 11px 13px;
  border-radius: var(--r-sm); border: 1px solid var(--line-2);
  background: var(--bg); color: var(--fg);
  font-size: 16px;   /* 16px evita o zoom automático do iOS ao focar */
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.input:hover { border-color: var(--fg-4); }
.input:focus { border-color: var(--brand); outline: none; box-shadow: 0 0 0 3px var(--brand-wash); }
select.input { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--fg-3) 50%), linear-gradient(135deg, var(--fg-3) 50%, transparent 50%); background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 34px; }

/* ---------- 16. Entrada (login) ---------- */
/* Enquanto ninguém entrou, o app é só a tela de entrada: sem menu, sem topo,
   sem a coluna do rail ocupando espaço. */
.entrando .app { grid-template-columns: 1fr; }
.entrando .rail,
.entrando .topbar,
.entrando .tabbar { display: none; }
.entrando .view { padding: 0; max-width: none; animation: none; }

.auth { min-height: 100dvh; display: grid; place-items: center; padding: 28px 18px calc(28px + var(--safe-b)); position: relative; overflow: hidden; }
.auth::before {
  content: ""; position: absolute; inset: -30% -10% auto -10%; height: 70%;
  background: radial-gradient(60% 60% at 50% 0%, rgba(124,140,255,.16), transparent 70%);
  pointer-events: none;
}
.auth__box { width: min(404px, 100%); position: relative; }
.auth__marca { display: flex; flex-direction: column; align-items: center; gap: 12px; margin-bottom: 28px; text-align: center; }
.auth__logo { width: 52px; height: 52px; border-radius: 15px; background: linear-gradient(140deg, var(--brand), #5d6ae0); display: grid; place-items: center; color: #fff; box-shadow: 0 6px 20px -6px rgba(124,140,255,.6); }
.auth__nome { font-family: var(--f-display); font-size: 27px; font-weight: 700; letter-spacing: -.035em; line-height: 1.1; }
.auth__tag { font-size: 13.5px; color: var(--fg-3); }
.auth__card { background: var(--surface-1); border: 1px solid var(--line); border-radius: var(--r-xl); padding: clamp(22px, 5vw, 30px); box-shadow: var(--sh-3); }
.auth__h { font-family: var(--f-display); font-size: 21px; font-weight: 700; letter-spacing: -.02em; margin: 0 0 6px; }
.auth__p { margin: 0 0 22px; font-size: 13.5px; color: var(--fg-3); line-height: 1.55; }
.auth__campos { display: grid; gap: 15px; }
.auth__erro {
  display: flex; gap: 9px; align-items: flex-start;
  padding: 11px 13px; margin-bottom: 18px; border-radius: var(--r-sm);
  background: var(--err-bg); border: 1px solid color-mix(in srgb, var(--err) 35%, transparent);
  color: var(--err); font-size: 13.5px; line-height: 1.45;
  animation: treme 380ms var(--ease);
}
.auth__erro svg { width: 17px; height: 17px; flex: none; margin-top: 1px; }
@keyframes treme { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-5px)} 40%{transform:translateX(5px)} 60%{transform:translateX(-3px)} 80%{transform:translateX(3px)} }
.auth__troca { text-align: center; margin-top: 20px; font-size: 13.5px; color: var(--fg-3); }
.auth__pistas { margin-top: 26px; display: grid; gap: 9px; }
.auth__pista { display: flex; gap: 10px; align-items: flex-start; font-size: 12.5px; color: var(--fg-3); line-height: 1.45; }
.auth__pista svg { width: 15px; height: 15px; flex: none; margin-top: 2px; color: var(--brand); }

/* ---------- 17. Diversos ---------- */
.empty { text-align: center; padding: 56px 20px; color: var(--fg-3); }
.empty svg { width: 38px; height: 38px; margin: 0 auto 12px; color: var(--fg-4); }
.split { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; }

.toast {
  position: fixed; left: 50%; bottom: calc(22px + var(--safe-b)); transform: translateX(-50%);
  z-index: 200; padding: 11px 20px; border-radius: 99px; max-width: calc(100vw - 32px);
  background: var(--surface-3); border: 1px solid var(--line-2);
  font-size: 13.5px; box-shadow: var(--sh-2);
  animation: toastin 280ms var(--ease-out) both;
}
@keyframes toastin { from { opacity: 0; transform: translate(-50%, 14px); } }

/* ---------- 18. Responsivo ---------- */
@media (max-width: 1080px) {
  .readshell { grid-template-columns: 1fr; }
  .toc { display: none; }
}

@media (max-width: 860px) {
  :root { --rail: 0px; }
  .app { grid-template-columns: 1fr; }

  /* o rail vira gaveta */
  .rail {
    position: fixed; inset: 0 auto 0 0; z-index: 90; width: min(290px, 84vw);
    transform: translateX(-100%); transition: transform 280ms var(--ease-out);
    box-shadow: var(--sh-3);
  }
  .rail[data-aberto="1"] { transform: none; }
  .veu {
    position: fixed; inset: 0; z-index: 80; background: rgba(5,7,11,.6);
    backdrop-filter: blur(3px); animation: surge 200ms var(--ease) both;
  }
  @keyframes surge { from { opacity: 0; } }

  .topbar { height: 56px; gap: 10px; }
  .menubtn {
    display: grid; place-items: center; width: 38px; height: 38px; margin-left: -6px;
    border-radius: var(--r-sm); color: var(--fg-2);
  }
  .menubtn:hover { background: var(--surface-2); color: var(--fg); }

  .view { padding-bottom: calc(86px + var(--safe-b)); }

  /* navegação inferior: o polegar alcança */
  .tabbar {
    display: grid; grid-template-columns: repeat(5,1fr);
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 70;
    padding-bottom: var(--safe-b);
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(18px) saturate(150%);
    -webkit-backdrop-filter: blur(18px) saturate(150%);
    border-top: 1px solid var(--line);
  }
  .tab {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 3px; min-height: 58px; padding: 7px 4px;
    font-size: 10.5px; font-weight: 550; color: var(--fg-3); text-decoration: none;
    position: relative;
  }
  .tab svg { width: 21px; height: 21px; }
  .tab[aria-current="true"] { color: var(--brand-2); }
  .tab__badge {
    position: absolute; top: 5px; left: 50%; margin-left: 4px;
    min-width: 17px; padding: 0 4px; border-radius: 99px;
    background: var(--brand); color: #0b0e14;
    font-size: 10px; font-weight: 700; line-height: 17px; text-align: center;
  }

  .srsrow { grid-template-columns: repeat(2,1fr); }
  .vid { grid-template-columns: 1fr; }
  .vid__thumb { max-width: 240px; }
  .simbar { top: 56px; }
  .track { padding-left: 24px; }
  .stage__dot { left: -24px; width: 24px; height: 24px; font-size: 11px; }
}

@media (min-width: 861px) {
  .menubtn, .veu { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* Impressão: só a apostila */
@media print {
  .rail, .topbar, .tabbar, .btnrow, .toc, .noprint { display: none !important; }
  body, .app, .view { background: #fff; color: #000; display: block; padding: 0; }
  .paper { box-shadow: none; padding: 0; }
  .prose { max-width: none; font-size: 11pt; }
  .prose pre { background: #f4f4f4; color: #000; border: 1px solid #ccc; }
}