/* CSS Variables */
:root {
  --primary-color: #1A1A2E;
  --secondary-color: #16213E;
  --tertiary-color: #0F3460;
  --accent-color: #E94560;
  --text-color: #FFFFFF;
  --background-color: #FFFFFF;
  --card-background: #FFFFFF;
  --border-color: #e9ecef;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --background-color: #1A1A2E;
  --card-background: #16213E;
  --text-color: #FFFFFF;
  --border-color: #0F3460;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Base Styles */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  transition: var(--transition);
  margin: 0;
  padding: 0;
}

/* Typography - Swiss Style */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--text-color);
}

h1 {
  font-size: 2.5rem;
  line-height: 1.2;
}

h2 {
  font-size: 2rem;
  line-height: 1.3;
}

h3 {
  font-size: 1.5rem;
  line-height: 1.4;
}

p {
  margin-bottom: 1rem;
  color: var(--text-color);
  opacity: 0.9;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  padding: 1rem 0;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color) !important;
  text-decoration: none;
}

.navbar-brand i {
  color: var(--accent-color);
  margin-right: 0.5rem;
}

/* Main Content */
.main-content {
  min-height: calc(100vh - 200px);
  padding: 2rem 0;
}

/* Welcome Section */
.welcome-section {
  padding: 4rem 0;
  background: linear-gradient(135deg, var(--tertiary-color), var(--secondary-color));
  margin: -2rem -15px 3rem -15px;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.welcome-section h1 {
  color: var(--text-color);
  margin-bottom: 1.5rem;
}

.welcome-section .lead {
  color: var(--text-color);
  opacity: 0.9;
  font-size: 1.2rem;
}

/* Cards */
.card {
  background-color: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  margin-bottom: 2rem;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.card-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-bottom: none;
  padding: 1.5rem;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.card-header h3 {
  color: var(--text-color);
  margin: 0;
  font-size: 1.25rem;
}

.card-header i {
  color: var(--accent-color);
  margin-right: 0.5rem;
}

.card-body {
  padding: 2rem;
}

/* Forms */
.form-label {
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.5rem;
}

.form-control,
.form-select {
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 0.75rem 1rem;
  font-size: 1rem;
  transition: var(--transition);
  background-color: var(--card-background);
  color: var(--text-color);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 0.2rem rgba(233, 69, 96, 0.25);
  background-color: var(--card-background);
  color: var(--text-color);
}

/* Buttons */
.btn {
  border-radius: var(--border-radius);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-color), #d63851);
  color: white;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #d63851, var(--accent-color));
  transform: translateY(-1px);
}

.btn-outline-primary {
  border: 2px solid var(--accent-color);
  color: var(--accent-color);
  background: transparent;
}

.btn-outline-primary:hover {
  background-color: var(--accent-color);
  color: white;
}

.btn-outline-light {
  border: 2px solid var(--text-color);
  color: var(--text-color);
}

.btn-outline-light:hover {
  background-color: var(--text-color);
  color: var(--primary-color);
}

/* Weekly Calendar */
.weekly-calendar {
  margin: 2rem 0;
}

.day-card {
  background-color: var(--card-background);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
  height: 100%;
}

.day-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

.day-card.active {
  border-color: var(--accent-color);
  background: linear-gradient(135deg, var(--accent-color), #d63851);
  color: white;
}

.day-card h5 {
  color: inherit;
  margin-bottom: 1rem;
}

.day-card .workout-type {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-bottom: 0.5rem;
}

.day-card .workout-duration {
  font-size: 0.8rem;
  opacity: 0.7;
}

.day-card i {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--accent-color);
}

.day-card.active i {
  color: white;
}

/* Progress Section */
.progress-section {
  background-color: var(--card-background);
  padding: 2rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.progress-card {
  text-align: center;
  padding: 1.5rem;
  background-color: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
}

.progress-card h4 {
  color: var(--accent-color);
  margin-bottom: 1rem;
}

.progress {
  height: 8px;
  border-radius: 4px;
  background-color: var(--border-color);
}

.progress-bar {
  background: linear-gradient(135deg, var(--accent-color), #d63851);
  border-radius: 4px;
  transition: width 0.6s ease;
}

/* Ad Banner */
.ad-banner {
  margin: 2rem 0;
}

.ad-placeholder {
  background-color: var(--border-color);
  color: var(--text-color);
  padding: 2rem;
  text-align: center;
  border-radius: var(--border-radius);
  opacity: 0.6;
}

.ad-placeholder i {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

/* Offcanvas */
.offcanvas {
  background-color: var(--card-background);
  border-right: 1px solid var(--border-color);
}

.offcanvas-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-color);
}

.offcanvas-title {
  color: var(--text-color);
}

.btn-close {
  filter: invert(1);
}

.plan-card {
  background-color: var(--card-background);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.plan-card:hover {
  border-color: var(--accent-color);
  background-color: rgba(233, 69, 96, 0.05);
}

.plan-card h6 {
  color: var(--accent-color);
  margin-bottom: 0.5rem;
}

.plan-card i {
  margin-right: 0.5rem;
}

/* Modal */
.modal-content {
  background-color: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.modal-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  color: var(--text-color);
}

.modal-body {
  color: var(--text-color);
}

/* FAQ Section */
.faq-section {
  margin: 4rem 0;
}

.accordion-item {
  background-color: var(--card-background);
  border: 1px solid var(--border-color);
  margin-bottom: 0.5rem;
  border-radius: var(--border-radius);
}

.accordion-button {
  background-color: var(--card-background);
  color: var(--text-color);
  border: none;
  font-weight: 600;
}

.accordion-button:not(.collapsed) {
  background-color: var(--accent-color);
  color: white;
}

.accordion-button:focus {
  box-shadow: none;
  border-color: var(--accent-color);
}

.accordion-body {
  background-color: var(--card-background);
  color: var(--text-color);
}

/* Footer */
.footer {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-color);
  padding: 2rem 0;
  margin-top: 4rem;
}

.footer p {
  margin: 0;
  opacity: 0.9;
}

.footer a {
  color: var(--accent-color);
  text-decoration: none;
}

.footer a:hover {
  color: white;
  text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
  .welcome-section {
    padding: 2rem 0;
    margin: -2rem -15px 2rem -15px;
  }
  
  .welcome-section h1 {
    font-size: 2rem;
  }
  
  .card-body {
    padding: 1.5rem;
  }
  
  .day-card {
    margin-bottom: 1rem;
  }
  
  .progress-section {
    padding: 1.5rem;
  }
  
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 576px) {
  .welcome-section h1 {
    font-size: 1.75rem;
  }
  
  .welcome-section .lead {
    font-size: 1rem;
  }
  
  .card-header {
    padding: 1rem;
  }
  
  .card-body {
    padding: 1rem;
  }
  
  .day-card {
    padding: 1rem;
  }
  
  .day-card i {
    font-size: 1.5rem;
  }
}

/* Animation Classes */
.fade-in {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-up {
  animation: slideUp 0.3s ease-out;
}

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

/* 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(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Utility Classes */
.text-accent {
  color: var(--accent-color) !important;
}

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

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

.shadow-custom {
  box-shadow: var(--shadow) !important;
}

.rounded-custom {
  border-radius: var(--border-radius) !important;
}

/* Dark Mode Toggle */
#darkModeToggle {
  border: 2px solid rgba(255, 255, 255, 0.3);
  background: transparent;
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#darkModeToggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: white;
}

/* Simulation Results */
.simulation-results {
  padding: 1rem 0;
}

.simulation-results h6 {
  color: var(--accent-color);
  font-weight: 600;
  margin-bottom: 1rem;
}

.simulation-results .list-unstyled li {
  padding: 0.25rem 0;
}

.simulation-results .bi-check-circle {
  margin-right: 0.5rem;
}

.progress-chart {
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  padding: 1rem;
  border: 1px solid var(--border-color);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--border-color);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #d63851;
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .btn,
  .ad-banner {
    display: none !important;
  }
  
  .main-content {
    margin: 0;
    padding: 0;
  }
  
  .card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}