/* ============================================
   Frequency Module - Basic CSS Styles
   Módulo de Frequência - Estilos Básicos
   ============================================ */

/* ====== VARIÁVEIS CSS ====== */
:root {
  /* Design System Colors */
  --frequency-primary: #667eea;
  --frequency-secondary: #764ba2;
  --frequency-success: #27ae60;
  --frequency-error: #e74c3c;
  
  /* Gradients */
  --frequency-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --frequency-gradient-light: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  
  /* Surfaces */
  --frequency-surface: #ffffff;
  --frequency-surface-alt: #f8fafc;
  --frequency-border: #e2e8f0;
  --frequency-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --frequency-text: #2d3748;
  --frequency-text-light: #718096;
  --frequency-text-muted: #a0aec0;
  
  /* Transitions */
  --frequency-transition: all 0.3s ease;
}

/* ====== LAYOUT PRINCIPAL ====== */
.frequency-module-container {
  min-height: 100vh;
  background: var(--frequency-surface-alt);
  padding: 1rem;
}

.frequency-wrapper {
  max-width: 1200px;
  margin: 0 auto;
}

/* ====== HEADER ====== */
.frequency-header {
  background: var(--frequency-gradient);
  color: white;
  padding: 2rem;
  border-radius: 16px;
  margin-bottom: 2rem;
  text-align: center;
}

.frequency-header h2 {
  margin: 0 0 1rem 0;
  font-size: 2rem;
  font-weight: 700;
}

/* ====== NAVEGAÇÃO ====== */
.frequency-nav {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1rem;
}

.nav-btn {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--frequency-transition);
}

.nav-btn:hover,
.nav-btn.active {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
}

/* ====== CONTEÚDO ====== */
.frequency-content {
  background: var(--frequency-surface);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--frequency-shadow);
}

.view-content {
  min-height: 400px;
}

/* ====== LOADING E STATES ====== */
.frequency-loading,
.loading-container {
  text-align: center;
  padding: 4rem 2rem;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--frequency-border);
  border-top: 4px solid var(--frequency-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.error-container {
  text-align: center;
  padding: 2rem;
  color: var(--frequency-error);
}

/* ====== FORMULÁRIOS ====== */
.checkin-view {
  max-width: 600px;
  margin: 0 auto;
}

.checkin-header {
  text-align: center;
  margin-bottom: 2rem;
}

.checkin-header h3 {
  color: var(--frequency-primary);
  margin-bottom: 0.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--frequency-text);
}

.form-group select {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--frequency-border);
  border-radius: 12px;
  font-size: 1rem;
  background: var(--frequency-surface);
  transition: var(--frequency-transition);
}

.form-group select:focus {
  outline: none;
  border-color: var(--frequency-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

.btn-primary {
  background: var(--frequency-gradient);
  color: white;
  border: none;
  padding: 1rem 2rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--frequency-transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.btn-outline {
  background: transparent;
  color: var(--frequency-primary);
  border: 2px solid var(--frequency-primary);
  padding: 1rem 2rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--frequency-transition);
}

.btn-outline:hover {
  background: var(--frequency-primary);
  color: white;
  transform: translateY(-2px);
}

/* ====== CHECK-INS RECENTES ====== */
.recent-checkins {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 2px solid var(--frequency-border);
}

.recent-checkins h4 {
  color: var(--frequency-text);
  margin-bottom: 1rem;
}

.checkin-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--frequency-surface-alt);
  border-radius: 12px;
  margin-bottom: 0.5rem;
  transition: var(--frequency-transition);
}

.checkin-item:hover {
  background: var(--frequency-gradient-light);
}

.student-name {
  font-weight: 600;
  color: var(--frequency-text);
}

.session-info {
  color: var(--frequency-text-light);
}

.time {
  color: var(--frequency-text-muted);
  font-size: 0.9rem;
}

/* ====== ESTADOS PLACEHOLDER ====== */
.history-view,
.reports-view {
  text-align: center;
  padding: 4rem 2rem;
}

.history-view h3,
.reports-view h3 {
  color: var(--frequency-primary);
  margin-bottom: 1rem;
}

/* ====== RESPONSIVIDADE ====== */
@media (max-width: 768px) {
  .frequency-nav {
    flex-direction: column;
    align-items: center;
  }
  
  .nav-btn {
    width: 100%;
    max-width: 200px;
  }
  
  .form-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .checkin-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}