:root {
  --bg: #f0f2f5;
  --sidebar-bg: #1a1f36;
  --sidebar-text: #c8cce5;
  --sidebar-hover: #2d3250;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #16a34a;
  --success-light: #dcfce7;
  --error: #dc2626;
  --error-light: #fee2e2;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --text: #1e293b;
  --text-secondary: #64748b;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ─── LOGIN ─── */
#login-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--sidebar-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s;
}
#login-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.login-card {
  text-align: center;
  max-width: 380px;
  width: 90%;
}

.login-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.login-card h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}

.login-subtitle {
  font-size: 0.9rem;
  color: var(--sidebar-text);
  margin-bottom: 2rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.login-form input {
  padding: 0.75rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  background: var(--sidebar-hover);
  color: #fff;
  font-size: 1rem;
  font-family: var(--font);
  outline: none;
  text-align: center;
  letter-spacing: 0.15em;
  transition: border-color 0.15s;
}
.login-form input:focus {
  border-color: var(--primary);
}

.login-form .btn {
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  border-radius: 8px;
}

.login-error {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--error);
  min-height: 1.5rem;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { font-size: 15px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
}

#app {
  display: flex;
  height: 100vh;
}

/* ─── SIDEBAR ─── */
#sidebar {
  width: 300px;
  min-width: 300px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-header {
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-header h1 i { color: var(--primary); }

.sidebar-subtitle {
  font-size: 0.8rem;
  color: var(--sidebar-text);
  margin-top: 0.15rem;
}

.sidebar-filters {
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.filter-group label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #8b8fae;
}

.filter-group label i { margin-right: 0.3rem; }

.filter-group select,
.filter-group input {
  padding: 0.5rem 0.65rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  background: var(--sidebar-hover);
  color: #fff;
  font-size: 0.85rem;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.15s;
}

.filter-group select:focus,
.filter-group input:focus {
  border-color: var(--primary);
}

.filter-group select option { background: var(--sidebar-bg); color: #fff; }

.filter-group input::placeholder { color: #6b6f8e; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary.active {
  background: var(--primary-dark);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.btn-secondary {
  background: var(--sidebar-hover);
  color: var(--sidebar-text);
  border: 1px solid rgba(255,255,255,0.1);
}
.btn-secondary:hover { background: rgba(255,255,255,0.1); color: #fff; }

.btn-text {
  background: none;
  color: var(--primary);
  padding: 0.4rem 0.6rem;
}
.btn-text:hover { text-decoration: underline; }

.sidebar-stats {
  padding: 0.75rem 1.25rem;
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.8rem;
  color: #8b8fae;
}

.sidebar-data {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.25rem 1.25rem 0.75rem;
}
.sidebar-data .btn-data {
  font-size: 0.75rem;
  padding: 0.3rem 0.5rem;
  justify-content: flex-start;
  color: #8b8fae;
  background: none;
}
.sidebar-data .btn-data:hover {
  color: var(--primary);
  text-decoration: none;
  background: var(--sidebar-hover);
  border-radius: 4px;
}

/* ─── MAIN ─── */
#main {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem 2rem;
  background: var(--bg);
}

.view { display: none; }
.view.active { display: block; }

.view-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.view-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
}

/* ─── PROVA LIST ─── */
.prova-list { display: flex; flex-direction: column; gap: 0.5rem; }

.prova-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
}

.prova-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

.prova-card-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.2rem;
}

.prova-card-info p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.prova-card-badge {
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  white-space: nowrap;
}

.prova-card-progress {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--success);
  white-space: nowrap;
}
.prova-card-progress i { margin-right: 0.2rem; }

.prova-card-remocoes {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}
.prova-card-remocoes i { margin-right: 0.2rem; font-size: 0.65rem; }

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
}
.empty-state i {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.4;
}
.empty-state p { font-size: 0.95rem; }

/* ─── EXAM HEADER ─── */
.exam-header-info h2 {
  font-size: 1.1rem;
  font-weight: 600;
}
.exam-header-info p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.exam-controls {
  margin-left: auto;
  display: flex;
  gap: 0.5rem;
}

/* ─── QUESTION ─── */
.question-container {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}

.question-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: #f8fafc;
  border-bottom: 1px solid var(--border);
  gap: 0.5rem;
  flex-wrap: wrap;
}

.question-nav-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.question-nav-right {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.question-nav button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: var(--font);
  color: var(--text);
  transition: all 0.15s;
}
.question-nav button:hover { background: var(--bg); border-color: var(--primary); color: var(--primary); }
.question-nav button:disabled { opacity: 0.4; cursor: default; }
.question-nav button:disabled:hover { background: none; border-color: var(--border); color: var(--text); }

.question-numbers {
  display: flex;
  gap: 0.3rem;
  flex-wrap: wrap;
  padding: 0.5rem 1.25rem;
  background: #f8fafc;
  border-bottom: 1px solid var(--border);
}

.q-num {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  background: #fff;
  color: var(--text);
}
.q-num:hover { border-color: var(--primary); color: var(--primary); }
.q-num.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.q-num.answered { background: var(--success-light); border-color: var(--success); color: var(--success); }
.q-num.answered.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.q-num.anulada { background: var(--warning-light); border-color: var(--warning); color: var(--warning); }

.question-content {
  padding: 1.5rem 1.75rem;
}

.question-enunciado {
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
  white-space: pre-wrap;
}

.question-anulada-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--warning-light);
  color: #92400e;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}

/* Alternativas */
.alternativas {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.alternativa {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  font-size: 0.9rem;
}

.alternativa:hover {
  border-color: var(--primary);
  background: #f0f7ff;
}

.alternativa .letra {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  min-width: 1.75rem;
  border-radius: 50%;
  background: var(--bg);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.alternativa .texto { padding-top: 0.15rem; }

.eliminar-btn {
  margin-left: auto;
  width: 1.5rem;
  height: 1.5rem;
  min-width: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  opacity: 0;
  transition: all 0.15s;
  border: 1px solid transparent;
  user-select: none;
}
.alternativa:hover .eliminar-btn {
  opacity: 0.5;
}
.alternativa:hover .eliminar-btn:hover {
  opacity: 1;
  background: var(--error-light);
  color: var(--error);
  border-color: var(--error);
}

/* Alternativa eliminada */
.alternativa.eliminada {
  opacity: 0.35;
  text-decoration: line-through;
  background: #fafafa;
  pointer-events: auto;
}
.alternativa.eliminada .eliminar-btn {
  opacity: 0.7;
  background: var(--error-light);
  color: var(--error);
  border-color: var(--error);
}
.alternativa.eliminada .eliminar-btn:hover {
  opacity: 1;
}
.alternativa.eliminada:hover {
  opacity: 0.5;
}

/* Alternativa selecionada no modo prova */
.alternativa.correta {
  border-color: var(--primary);
  background: #eff6ff;
}
.alternativa.correta .letra {
  background: var(--primary);
  color: #fff;
}

/* Modo revisão */
.modo-revisao .alternativa.correta {
  border-color: var(--success);
  background: var(--success-light);
}
.modo-revisao .alternativa.correta .letra {
  background: var(--success);
  color: #fff;
}
.modo-revisao .alternativa.errada {
  border-color: var(--error);
  background: var(--error-light);
}
.modo-revisao .alternativa.errada .letra {
  background: var(--error);
  color: #fff;
}

.modo-revisao .gabarito-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--success-light);
  border: 1px solid var(--success);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: #166534;
}

.discursiva-area {
  margin-top: 1rem;
}
.discursiva-area textarea {
  width: 100%;
  min-height: 120px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--font);
  font-size: 0.9rem;
  resize: vertical;
  outline: none;
}
.discursiva-area textarea:focus { border-color: var(--primary); }

/* ─── RESULTADO ─── */
#resultado-content {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem 1.75rem;
}

.resultado-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  text-align: center;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #f8fafc;
}

.stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}
.stat-card .stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.stat-card.acertos .stat-value { color: var(--success); }
.stat-card.erros .stat-value { color: var(--error); }
.stat-card.anuladas .stat-value { color: var(--warning); }
.stat-card.total .stat-value { color: var(--primary); }

.resultado-questoes {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.resultado-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
}
.resultado-item.acertou { border-left: 4px solid var(--success); }
.resultado-item.errou { border-left: 4px solid var(--error); }
.resultado-item.anulada-item { border-left: 4px solid var(--warning); }

.resultado-item .q-numero {
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 3rem;
}
.resultado-item .q-status {
  font-weight: 500;
}
.resultado-item .q-status.acertou { color: var(--success); }
.resultado-item .q-status.errou { color: var(--error); }
.resultado-item .q-status.anulada-item { color: var(--warning); }
.resultado-item .q-resposta {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ─── LOADING ─── */
.loading {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.loading i { margin-right: 0.4rem; }

/* ─── RESPONSIVO ─── */
@media (max-width: 768px) {
  #app { flex-direction: column; }
  #sidebar {
    width: 100%;
    min-width: unset;
    max-height: 40vh;
  }
  #main { padding: 1rem; }
  .view-header { flex-direction: column; align-items: flex-start; }
  .exam-controls { margin-left: 0; }
  .question-numbers { max-height: 120px; overflow-y: auto; }
}