:root {
  --bg: #f2f4f7;
  --card: #ffffff;
  --border: #e3e6eb;
  --border-strong: #d3d8e0;
  --text: #1f2430;
  --text-dim: #6b7280;
  --text-faint: #9aa1ac;
  --blue: #2f6fed;
  --blue-dark: #1d54c4;
  --blue-bg: #eaf1ff;
  --green: #1f9d55;
  --green-bg: #e8f8ee;
  --red: #e0342c;
  --red-bg: #fdeceb;
  --amber: #b8860b;
  --amber-bg: #fbf3df;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16,24,40,0.04), 0 1px 3px rgba(16,24,40,0.06);
  font-size: 16px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, system-ui, -apple-system, sans-serif;
  padding-bottom: 90px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }

header.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 20;
}
header.topbar .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); letter-spacing: 0.2px; }
header.topbar .brand .badge {
  width: 32px; height: 32px; border-radius: 9px;
  background: var(--blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; color: #fff;
}
header.topbar .countdown {
  font-size: 13px; color: var(--text-dim);
  background: var(--blue-bg); border: 1px solid #cfe0ff;
  padding: 6px 14px; border-radius: 20px;
}
header.topbar .countdown b { color: var(--blue-dark); }

main { max-width: 980px; margin: 0 auto; padding: 20px 16px 40px; }

.grid { display: grid; gap: 14px; }
.grid.cols-2 { grid-template-columns: 1fr 1fr; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 720px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr 1fr; }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 4px; font-size: 12.5px; color: var(--text-dim); font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }
.card .big { font-size: 28px; font-weight: 800; margin: 6px 0; color: var(--text); }
.card .big.green { color: var(--green); }
.card .big.red { color: var(--red); }
.card .big.blue { color: var(--blue); }
.card .sub { font-size: 12px; color: var(--text-faint); }

.section-title {
  font-size: 13.5px; text-transform: uppercase; letter-spacing: 0.8px;
  color: var(--text-dim); margin: 28px 0 12px; font-weight: 700;
  display: flex; align-items: center; gap: 8px;
}
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--border); }

.barlist { display: flex; flex-direction: column; gap: 10px; }
.barlist .row { display: grid; grid-template-columns: 150px 1fr 42px; align-items: center; gap: 10px; font-size: 13px; }
.barlist .label { color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.barlist .track { height: 9px; background: #eef0f3; border-radius: 6px; overflow: hidden; }
.barlist .fill { height: 100%; border-radius: 6px; background: var(--blue); }
.barlist .fill.weak { background: var(--red); }
.barlist .pct { text-align: right; font-weight: 700; color: var(--text); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 18px; border-radius: 9px; border: 1px solid var(--border-strong);
  background: #fff; color: var(--text); font-weight: 600; cursor: pointer;
  font-size: 14px; transition: 0.15s;
}
.btn:hover { border-color: var(--blue); color: var(--blue); }
.btn.primary { background: var(--blue); color: #fff; border: none; }
.btn.primary:hover { background: var(--blue-dark); color: #fff; }
.btn.danger { background: var(--red-bg); border-color: #f3c8c5; color: var(--red); }
.btn.ghost { background: #fff; }
.btn.block { width: 100%; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.pill {
  display: inline-block; padding: 3px 10px; border-radius: 20px;
  background: var(--blue-bg); border: 1px solid #cfe0ff; color: var(--blue-dark);
  font-size: 11px; font-weight: 600;
}
.pill.gray { background: #f0f1f3; border-color: var(--border); color: var(--text-dim); }

nav.bottomnav {
  position: fixed; bottom: 0; left: 0; right: 0; height: 64px;
  background: #ffffff; border-top: 1px solid var(--border);
  display: flex; z-index: 30;
}
nav.bottomnav a {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; font-size: 11px; color: var(--text-faint); font-weight: 600;
}
nav.bottomnav a.active { color: var(--blue); }
nav.bottomnav a .ic { font-size: 19px; }

/* ===== Estilo de questão (referência QConcursos) ===== */
.question-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 16px; box-shadow: var(--shadow); overflow: hidden; }
.q-head {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 18px; background: #fafbfc; border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.q-head .qnum {
  width: 24px; height: 24px; border-radius: 6px; background: var(--text); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 12px; flex-shrink: 0;
}
.q-head .qcode { color: var(--text-faint); }
.q-head .qsubject { color: var(--blue); font-weight: 600; }
.q-meta {
  padding: 10px 18px; font-size: 12.5px; color: var(--text-dim); border-bottom: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 4px 6px;
}
.q-meta b { color: var(--text); font-weight: 700; }
.q-meta .sep { color: var(--border-strong); margin: 0 2px; }
.q-body { padding: 20px 18px 8px; }
.q-body .enunciado { font-size: 15.5px; line-height: 1.6; color: var(--text); margin-bottom: 18px; }

.options-ce { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 0 18px 18px; }
.opt-row {
  display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-radius: 10px;
  border: 1.5px solid var(--border); background: #fff; cursor: pointer; transition: 0.12s;
}
.opt-row:hover { border-color: var(--blue); background: var(--blue-bg); }
.opt-row .badge {
  width: 30px; height: 30px; border-radius: 50%; border: 1.5px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px;
  flex-shrink: 0; color: var(--text-dim); background: #fafbfc;
}
.opt-row .opt-text { font-weight: 700; font-size: 14.5px; color: var(--text); }
.opt-row.correct-answer { border-color: var(--green); background: var(--green-bg); }
.opt-row.correct-answer .badge { border-color: var(--green); color: var(--green); background: #fff; }
.opt-row.wrong-answer { border-color: var(--red); background: var(--red-bg); }
.opt-row.wrong-answer .badge { border-color: var(--red); color: var(--red); background: #fff; }

.q-actions { padding: 12px 18px 18px; }

.progressbar { height: 6px; background: #eef0f3; border-radius: 6px; overflow: hidden; margin-bottom: 20px; }
.progressbar .fill { height: 100%; background: var(--blue); transition: 0.3s; }

.explicacao {
  margin: 0 18px 18px; padding: 14px 16px; border-radius: 10px;
  background: #f7f9fc; border: 1px solid var(--border); font-size: 13.5px; color: var(--text-dim); line-height: 1.55;
}
.explicacao b.gab-c { color: var(--green); }
.explicacao b.gab-e { color: var(--red); }
.tag-conf { font-size: 10px; padding: 2px 8px; border-radius: 10px; margin-left: 6px; font-weight: 700; }
.tag-conf.alta { background: var(--green-bg); color: var(--green); }
.tag-conf.media { background: var(--amber-bg); color: var(--amber); }
.tag-conf.baixa { background: var(--red-bg); color: var(--red); }

.q-bottombar {
  display: flex; flex-wrap: wrap; gap: 22px;
  padding: 12px 18px; border-top: 1px solid var(--border); background: #fafbfc;
  font-size: 12.5px; color: var(--text-dim);
}
.q-bottombar .abtn { display: flex; align-items: center; gap: 6px; cursor: pointer; font-weight: 600; }
.q-bottombar .abtn:hover { color: var(--blue); }
.q-bottombar .abtn.active { color: var(--blue); }
.q-bottombar .abtn.report { color: var(--red); }
.q-bottombar .abtn .ic { font-size: 15px; }

.anotacao-box { display: none; margin: 0 18px 18px; }
.anotacao-box.open { display: block; }
.anotacao-box textarea {
  width: 100%; min-height: 70px; border-radius: 10px; border: 1px solid var(--border);
  padding: 10px 12px; font-family: inherit; font-size: 13.5px; resize: vertical;
}

/* Flashcard / estudo */
.flashcard {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; min-height: 200px; display: flex; flex-direction: column; justify-content: center;
  text-align: center; font-size: 17px; line-height: 1.55; box-shadow: var(--shadow);
}
.rating-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 16px; }
.rating-row button { padding: 12px 6px; border-radius: 10px; border: none; font-weight: 700; font-size: 12px; cursor: pointer; color: #fff; }
.r1 { background: #d64a44; }
.r2 { background: #d99a2b; }
.r3 { background: #2f9e58; }
.r4 { background: #2f6fed; }

.timeline-day { border-left: 3px solid var(--blue); padding-left: 16px; margin-bottom: 24px; position: relative; }
.timeline-day::before { content: ""; position: absolute; left: -8px; top: 2px; width: 13px; height: 13px; border-radius: 50%; background: var(--blue); }
.timeline-day h4 { margin: 0 0 8px; font-size: 15px; color: var(--text); }
.tarefa { display: flex; align-items: flex-start; gap: 10px; padding: 8px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.tarefa:last-child { border-bottom: none; }
.tarefa input[type=checkbox] { margin-top: 3px; width: 18px; height: 18px; accent-color: var(--blue); }
.tarefa.done label { text-decoration: line-through; color: var(--text-faint); }

.select-mode { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; }
.select-mode button { flex: 1; min-width: 140px; }

.result-summary { text-align: center; padding: 24px; }
.result-summary .score { font-size: 48px; font-weight: 800; color: var(--blue); }

.topic-item {
  display: flex; align-items: center; justify-content: space-between; padding: 12px 16px;
  border-radius: 10px; border: 1px solid var(--border); background: #fff; cursor: pointer; margin-bottom: 8px;
}
.topic-item:hover { border-color: var(--blue); }
.topic-item .name { font-size: 14px; font-weight: 600; }
.topic-item .count { font-size: 12px; color: var(--text-faint); }
.subject-header { display: flex; align-items: center; justify-content: space-between; margin: 22px 0 10px; }
.subject-header h2 { font-size: 16px; margin: 0; }

.hidden { display: none !important; }
.text-dim { color: var(--text-dim); }
.mt-20 { margin-top: 20px; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }

.texto-base { background: var(--surface-2, rgba(127,127,127,.08)); border-left: 3px solid var(--accent, #4f8cff); border-radius: 8px; padding: 10px 14px; margin: 0 0 14px; font-size: 14px; line-height: 1.65; }
.texto-base summary { cursor: pointer; font-weight: 700; font-size: 13px; }
.texto-base-corpo { margin-top: 8px; text-align: justify; }
.texto-base.ausente { font-size: 13px; opacity: .8; }