/* ==========================================================================
   CSS Reset and Base Styles
   ========================================================================== */

:root {
  /* Color Palette - Swiss Style */
  --primary-dark: #05386B;
  --primary-medium: #379683;
  --primary-light: #5CDB95;
  --accent-light: #8EE4AF;
  --background-light: #EDF5E1;
  
  /* Dark Mode Colors */
  --dark-bg: #1a1a1a;
  --dark-surface: #2d2d2d;
  --dark-text: #e0e0e0;
  --dark-border: #404040;
  
  /* Typography */
  --font-primary: 'Helvetica Neue', Arial, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-md: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  --shadow-lg: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  color: var(--primary-dark);
  background-color: var(--background-light);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ==========================================================================
   Typography - Swiss Style
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
}

.display-1, .display-2, .display-3, .display-4 {
  font-weight: var(--font-weight-light);
  letter-spacing: -0.05em;
}

p {
  margin-bottom: var(--spacing-md);
}

.lead {
  font-weight: var(--font-weight-light);
  font-size: 1.25rem;
}

/* ==========================================================================
   Bootstrap Customizations
   ========================================================================== */

.btn {
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.02em;
  border-radius: 0.375rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary {
  background-color: var(--primary-medium);
  border-color: var(--primary-medium);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-outline-primary {
  color: var(--primary-medium);
  border-color: var(--primary-medium);
}

.btn-outline-primary:hover {
  background-color: var(--primary-medium);
  border-color: var(--primary-medium);
}

.card {
  border: none;
  border-radius: 0.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.form-control, .form-select {
  border-radius: 0.375rem;
  border: 2px solid #e9ecef;
  transition: border-color var(--transition-fast);
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 0.2rem rgba(92, 219, 149, 0.25);
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.navbar {
  backdrop-filter: blur(10px);
  background-color: rgba(237, 245, 225, 0.95) !important;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.navbar-brand {
  font-weight: var(--font-weight-bold);
  font-size: 1.5rem;
  color: var(--primary-dark) !important;
}

.nav-link {
  font-weight: var(--font-weight-medium);
  color: var(--primary-dark) !important;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--primary-medium) !important;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  background: linear-gradient(135deg, var(--background-light) 0%, rgba(92, 219, 149, 0.1) 100%);
  padding-top: 80px;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-section h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: var(--spacing-lg);
}

.text-primary {
  color: var(--primary-medium) !important;
}

/* ==========================================================================
   Chart Containers
   ========================================================================== */

.chart-container {
  position: relative;
  background: white;
  border-radius: 0.5rem;
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-lg);
}

#heroChart, #retentionChart, #ebbinghausChart {
  max-height: 300px;
}

/* ==========================================================================
   Topic Cards and Calendar
   ========================================================================== */

.topic-card {
  border-left: 4px solid var(--primary-light);
  transition: all var(--transition-normal);
  margin-bottom: var(--spacing-md);
}

.topic-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.topic-card__header {
  display: flex;
  justify-content: between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.topic-card__title {
  font-weight: var(--font-weight-bold);
  color: var(--primary-dark);
  margin-bottom: var(--spacing-xs);
}

.topic-card__meta {
  font-size: 0.875rem;
  color: #6c757d;
  margin-bottom: var(--spacing-md);
}

.review-schedule {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.review-day {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.review-day--pending {
  background-color: var(--accent-light);
  color: var(--primary-dark);
}

.review-day--today {
  background-color: var(--primary-medium);
  color: white;
  animation: pulse 2s infinite;
}

.review-day--completed {
  background-color: var(--primary-light);
  color: var(--primary-dark);
}

.review-day--overdue {
  background-color: #dc3545;
  color: white;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* ==========================================================================
   Statistics
   ========================================================================== */

.stat-number {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-medium);
  line-height: 1;
}

/* ==========================================================================
   Empty State
   ========================================================================== */

.empty-state {
  padding: var(--spacing-xxl) var(--spacing-lg);
}

.empty-state .bi {
  opacity: 0.3;
}

/* ==========================================================================
   Technique Cards (Offcanvas)
   ========================================================================== */

.technique-card {
  padding: var(--spacing-md);
  border: 1px solid #e9ecef;
  border-radius: 0.375rem;
  background-color: #f8f9fa;
  transition: background-color var(--transition-fast);
}

.technique-card:hover {
  background-color: #e9ecef;
}

.technique-card h6 {
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-bold);
}

.technique-card .bi {
  margin-right: var(--spacing-xs);
}

/* ==========================================================================
   Ad Banners
   ========================================================================== */

.ad-banner {
  min-height: 90px;
  background-color: #f8f9fa;
  border: 1px dashed #dee2e6;
  border-radius: 0.375rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #6c757d;
  font-size: 0.875rem;
}

.ad-banner::before {
  content: "Publicidade";
  font-size: 0.75rem;
  opacity: 0.5;
}

/* ==========================================================================
   Dark Mode
   ========================================================================== */

[data-bs-theme="dark"] {
  --bs-body-bg: var(--dark-bg);
  --bs-body-color: var(--dark-text);
}

[data-bs-theme="dark"] body {
  background-color: var(--dark-bg);
  color: var(--dark-text);
}

[data-bs-theme="dark"] .navbar {
  background-color: rgba(45, 45, 45, 0.95) !important;
}

[data-bs-theme="dark"] .navbar-brand,
[data-bs-theme="dark"] .nav-link {
  color: var(--dark-text) !important;
}

[data-bs-theme="dark"] .hero-section {
  background: linear-gradient(135deg, var(--dark-bg) 0%, rgba(55, 150, 131, 0.1) 100%);
}

[data-bs-theme="dark"] .card {
  background-color: var(--dark-surface);
  border-color: var(--dark-border);
}

[data-bs-theme="dark"] .chart-container {
  background-color: var(--dark-surface);
}

[data-bs-theme="dark"] .form-control,
[data-bs-theme="dark"] .form-select {
  background-color: var(--dark-surface);
  border-color: var(--dark-border);
  color: var(--dark-text);
}

[data-bs-theme="dark"] .technique-card {
  background-color: var(--dark-surface);
  border-color: var(--dark-border);
}

[data-bs-theme="dark"] .ad-banner {
  background-color: var(--dark-surface);
  border-color: var(--dark-border);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Mobile First Approach */
@media (max-width: 576px) {
  .hero-section {
    padding-top: 100px;
    text-align: center;
  }
  
  .hero-section .btn {
    width: 100%;
    margin-bottom: var(--spacing-sm);
  }
  
  .chart-container {
    padding: var(--spacing-md);
  }
  
  .review-schedule {
    justify-content: center;
  }
  
  .review-day {
    width: 2rem;
    height: 2rem;
    font-size: 0.7rem;
  }
  
  .stat-number {
    font-size: 1.5rem;
  }
}

@media (min-width: 577px) and (max-width: 768px) {
  .hero-section h1 {
    font-size: 2.5rem;
  }
  
  .chart-container {
    margin-top: var(--spacing-lg);
  }
}

@media (min-width: 769px) and (max-width: 992px) {
  .hero-section {
    padding-top: 120px;
  }
}

@media (min-width: 993px) {
  .hero-section {
    padding-top: 80px;
  }
  
  .topic-card {
    margin-bottom: var(--spacing-lg);
  }
}

/* ==========================================================================
   Animations and Transitions
   ========================================================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-right {
  animation: slideInRight 0.4s ease-out;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.text-shadow {
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.bg-primary-light {
  background-color: var(--background-light) !important;
}

.border-primary-light {
  border-color: var(--primary-light) !important;
}

.cursor-pointer {
  cursor: pointer;
}

.user-select-none {
  user-select: none;
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  .navbar,
  .offcanvas,
  .modal,
  .ad-banner,
  footer {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .card {
    box-shadow: none !important;
    border: 1px solid #ddd !important;
  }
}

/* ==========================================================================
   Accessibility
   ========================================================================== */

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-dark);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  z-index: 9999;
}

.skip-link:focus {
  top: 0;
}

/* Focus styles for better accessibility */
.btn:focus,
.form-control:focus,
.form-select:focus {
  outline: 2px solid var(--primary-light);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .card {
    border: 2px solid var(--primary-dark);
  }
  
  .btn {
    border-width: 2px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   Loading States
   ========================================================================== */

.loading {
  position: relative;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--primary-light);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}