/* Modern UI improvements */
:root {
  --primary: #4CAF50;
  --primary-light: #E8F5E9;
  --primary-dark: #2E7D32;
  --secondary: #ff9800;
  --success: #4caf50;
  --danger: #f44336;
  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --gray-900: #212529;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
}

body {
  font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: #FFFFFF !important;
  color: var(--gray-800);
  line-height: 1.7;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* Modern header */
header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 30px 0;
  border-radius: var(--radius);
  margin-bottom: 40px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

header::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
  pointer-events: none;
}

header h1 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.5px;
  font-size: 2.5rem;
}

.tagline {
  margin-top: 5px;
  opacity: 0.9;
  font-weight: 300;
  font-size: 1.1rem;
}

/* Feature cards */
.feature-cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
  margin-top: 50px;
}

.feature-card {
  background-color: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 30px;
  width: 300px;
  text-align: center;
  transition: var(--transition);
  text-decoration: none;
  color: var(--gray-800);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--gray-200);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--primary), #8BC34A);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.card-icon {
  font-size: 64px;
  margin-bottom: 20px;
  display: inline-block;
  position: relative;
}

.card-icon::after {
  content: "";
  position: absolute;
  width: 80px;
  height: 80px;
  background-color: var(--primary-light);
  border-radius: 50%;
  z-index: -1;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.5;
}

.feature-card h3 {
  margin: 15px 0;
  color: var(--primary-dark);
  font-weight: 600;
  font-size: 1.5rem;
}

.feature-card p {
  color: #000000;
  margin-bottom: 20px;
}

.card-action {
  color: var(--primary);
  font-weight: 500;
  font-size: 0.9rem;
  display: inline-block;
  transition: var(--transition);
}

.feature-card:hover .card-action {
  transform: translateX(5px);
}

/* Welcome message */
.welcome-message {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.welcome-message h2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 15px;
  letter-spacing: -0.5px;
}

.welcome-message p {
  font-size: 1.1rem;
  color: #000000;
  margin-bottom: 30px;
}

/* Quick stats */
.quick-stats {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-top: 60px;
  flex-wrap: wrap;
}

.stat-card {
  background-color: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  min-width: 150px;
  text-align: center;
  border: 1px solid var(--gray-200);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 5px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--gray-600);
}

/* Buttons */
.btn {
  padding: 12px 24px;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  background-color: var(--primary-dark);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.back-btn {
  padding: 8px 16px;
  background-color: var(--gray-600);
  font-size: 14px;
}

.back-btn:hover {
  background-color: var(--gray-700);
}

/* Footer */
footer {
  text-align: center;
  margin-top: 60px;
  padding: 20px 0;
  color: var(--gray-600);
  border-top: 1px solid var(--gray-200);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--gray-600);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
}

/* Filter controls with improved styling */
.filter-controls {
  background-color: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 30px;
  border: 1px solid var(--gray-200);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.filter-group label {
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 0;
}

.filter-group select {
  padding: 10px 15px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  background-color: white;
  font-size: 14px;
  min-width: 150px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
}

/* Chart improvements */
.chart-container {
  background-color: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin: 30px 0;
  border: 1px solid var(--gray-200);
}

.chart-container h3 {
  margin-bottom: 20px;
  color: var(--gray-800);
  font-weight: 600;
}

/* Table improvements */
.table-container {
  background-color: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin: 30px 0;
  border: 1px solid var(--gray-200);
  overflow-x: auto;
}

.table-container h3 {
  margin-bottom: 20px;
  color: var(--gray-800);
  font-weight: 600;
}

.leaderboard-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

.leaderboard-table th, 
.leaderboard-table td {
  padding: 15px;
  text-align: left;
}

.leaderboard-table th {
  background-color: var(--gray-100);
  font-weight: 600;
  color: var(--gray-700);
  position: sticky;
  top: 0;
}

.leaderboard-table th:first-child {
  border-top-left-radius: var(--radius);
}

.leaderboard-table th:last-child {
  border-top-right-radius: var(--radius);
}

.leaderboard-table tr:nth-child(even) {
  background-color: var(--gray-100);
}

.leaderboard-table tr:hover {
  background-color: var(--primary-light);
}

tr.current-user {
  background-color: rgba(74, 144, 226, 0.1) !important;
  font-weight: 500;
}

tr.current-user td:first-child {
  border-left: 3px solid var(--primary);
}

/* Monthly trend improvements */
.monthly-trend {
  background-color: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin: 30px 0;
  border: 1px solid var(--gray-200);
}

.monthly-trend h3 {
  margin-bottom: 20px;
  color: var(--gray-800);
  font-weight: 600;
  text-align: center;
}

.trend-chart {
  height: 300px;
  margin: 30px 0;
}

.trend-bar {
  background: linear-gradient(to top, var(--primary), var(--primary-dark));
  border-radius: var(--radius) var(--radius) 0 0;
  transition: var(--transition);
}

.trend-bar:hover {
  transform: scaleY(1.05);
  box-shadow: var(--shadow);
}

.trend-value {
  background-color: white;
  border-radius: 12px;
  padding: 2px 6px;
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .feature-cards {
    flex-direction: column;
    align-items: center;
  }
  
  .feature-card {
    width: 100%;
    max-width: 350px;
  }
  
  header h1 {
    font-size: 2rem;
  }
  
  .welcome-message h2 {
    font-size: 1.8rem;
  }
  
  .filter-row {
    flex-direction: column;
  }
  
  .filter-group {
    width: 100%;
  }
  
  .footer-content {
    flex-direction: column;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --primary-light: #1e3a5f;
    --gray-100: #2d3748;
    --gray-200: #4a5568;
    --gray-800: #e2e8f0;
    --gray-900: #f7fafc;
  }
  
  body {
    background-color: #FFFFFF !important;
    color: #f7fafc;
  }
  
  .feature-card, .stat-card, .filter-controls, .chart-container, .table-container, .monthly-trend {
    background-color: #FFFFFF !important;
    border-color: #4a5568;
    color: #f7fafc;
  }
  
  .feature-card p, .stat-label {
    color: #cbd5e0;
  }
  
  .leaderboard-table th {
    background-color: #f8f9fa !important;
    color: #e2e8f0;
  }
  
  .leaderboard-table tr:nth-child(even) {
    background-color: #f8f9fa !important;
  }
  
  .leaderboard-table tr:hover {
    background-color: #E8F5E9 !important;
  }
  
  tr.current-user {
    background-color: rgba(74, 144, 226, 0.2) !important;
  }
}
/* Enhanced focus styles */
:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

input:focus, 
textarea:focus, 
select:focus, 
button:focus {
  outline: 2px solid var(--primary);
  box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.2);
  border-color: var(--primary) !important;
}

.feature-card:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.2);
}

.tab:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.3);
}

/* Keyboard navigation focus styles */
:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.2);
}
/* Enhanced UI/UX improvements */
.feature-card {
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 30px rgba(76, 175, 80, 0.2);
}

.feature-card:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #4CAF50, #8BC34A);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.feature-card:hover:after {
  transform: scaleX(1);
}

.card-action {
  font-weight: 600;
  transition: transform 0.3s;
}

.feature-card:hover .card-action {
  transform: translateX(5px);
  color: #4CAF50;
}

/* Improved stat cards */
.stat-card {
  transition: all 0.3s ease;
  cursor: pointer;
  overflow: hidden;
  position: relative;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(76, 175, 80, 0.15);
}

.stat-card:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #4CAF50, #8BC34A);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.stat-card:hover:before {
  transform: scaleX(1);
}

.stat-value {
  transition: all 0.3s ease;
}

.stat-card:hover .stat-value {
  transform: scale(1.1);
  color: #4CAF50;
}

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

.welcome-message {
  animation: fadeIn 0.8s ease-out;
}

.feature-cards {
  animation: fadeIn 0.8s ease-out 0.2s both;
}

.quick-stats {
  animation: fadeIn 0.8s ease-out 0.4s both;
}

/* Improved accessibility */
:focus {
  outline: 2px solid #4CAF50;
  outline-offset: 2px;
}

.feature-card:focus {
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.5);
}

/* Dark mode improvements */
@media (prefers-color-scheme: dark) {
  .feature-card:hover {
    box-shadow: 0 15px 30px rgba(76, 175, 80, 0.3);
  }
  
  .stat-card:hover {
    box-shadow: 0 8px 20px rgba(76, 175, 80, 0.25);
  }
}
/* Header wave animation */
.header-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 15px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120' preserveAspectRatio='none'%3E%3Cpath d='M0,0V46.29c47.79,22.2,103.59,32.17,158,28,70.36-5.37,136.33-33.31,206.8-37.5C438.64,32.43,512.34,53.67,583,72.05c69.27,18,138.3,24.88,209.4,13.08,36.15-6,69.85-17.84,104.45-29.34C989.49,25,1113-14.29,1200,52.47V0Z' opacity='.25' fill='%23ffffff'%3E%3C/path%3E%3Cpath d='M0,0V15.81C13,36.92,27.64,56.86,47.69,72.05,99.41,111.27,165,111,224.58,91.58c31.15-10.15,60.09-26.07,89.67-39.8,40.92-19,84.73-46,130.83-49.67,36.26-2.85,70.9,9.42,98.6,31.56,31.77,25.39,62.32,62,103.63,73,40.44,10.79,81.35-6.69,119.13-24.28s75.16-39,116.92-43.05c59.73-5.85,113.28,22.88,168.9,38.84,30.2,8.66,59,6.17,87.09-7.5,22.43-10.89,48-26.93,60.65-49.24V0Z' opacity='.5' fill='%23ffffff'%3E%3C/path%3E%3Cpath d='M0,0V5.63C149.93,59,314.09,71.32,475.83,42.57c43-7.64,84.23-20.12,127.61-26.46,59-8.63,112.48,12.24,165.56,35.4C827.93,77.22,886,95.24,951.2,90c86.53-7,172.46-45.71,248.8-84.81V0Z' fill='%23ffffff'%3E%3C/path%3E%3C/svg%3E") no-repeat;
  background-size: cover;
  animation: wave 10s linear infinite;
}

@keyframes wave {
  0% {
    background-position-x: 0;
  }
  100% {
    background-position-x: 1000px;
  }
}

/* Improved header */
header {
  position: relative;
  overflow: hidden;
  padding-bottom: 30px;
}
/* Stat card icons */
.stat-icon {
  font-size: 24px;
  margin-bottom: 5px;
  opacity: 0.8;
  transition: all 0.3s ease;
}

.stat-card:hover .stat-icon {
  transform: scale(1.2);
  opacity: 1;
}

/* Improved stat cards layout */
.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 25px 15px;
}
/* Welcome message improvements */
.welcome-message {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 40px;
}

.welcome-message h2 {
  margin-bottom: 15px;
}

.welcome-message p {
  font-size: 18px;
  line-height: 1.6;
  color: #000000;
  margin-bottom: 25px;
}

.highlight {
  display: inline-block;
  animation: sparkle 1.5s infinite;
}

@keyframes sparkle {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.8; }
  100% { transform: scale(1); opacity: 1; }
}

.welcome-actions {
  display: flex;
  gap: 15px;
  justify-content: center;
  margin-top: 20px;
}

.primary-btn {
  background: linear-gradient(135deg, #4CAF50, #8BC34A);
  color: white;
  padding: 12px 24px;
  border-radius: 30px;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  box-shadow: 0 4px 10px rgba(76, 175, 80, 0.2);
}

.primary-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(76, 175, 80, 0.3);
}

.text-btn {
  color: #4CAF50;
  padding: 12px 24px;
  font-weight: 600;
  position: relative;
}

.text-btn:after {
  content: "";
  position: absolute;
  bottom: 8px;
  left: 24px;
  right: 24px;
  height: 2px;
  background-color: #4CAF50;
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.text-btn:hover:after {
  transform: scaleX(1);
}
/* Responsive improvements */
@media (max-width: 768px) {
  .feature-cards {
    grid-template-columns: 1fr;
  }
  
  .quick-stats {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .welcome-actions {
    flex-direction: column;
    gap: 10px;
  }
  
  .primary-btn, .text-btn {
    width: 100%;
    text-align: center;
  }
  
  .header-wave {
    height: 10px;
  }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  .feature-card, .stat-card, .welcome-message, .feature-cards, .quick-stats, .header-wave,
  .highlight, .primary-btn, .text-btn, .stat-icon {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
}