:root {
  /* Mario Kart Color Palette */
  --mario-red: #FF1744;
  --mario-blue: #2196F3;
  --mario-yellow: #FFD600;
  --mario-green: #4CAF50;
  --mario-orange: #FF9800;
  --mario-purple: #9C27B0;
  --mario-pink: #E91E63;
  
  /* UI Colors */
  --primary: var(--mario-red);
  --secondary: var(--mario-blue);
  --accent: var(--mario-yellow);
  --success: var(--mario-green);
  --warning: var(--mario-orange);
  --error: #F44336;
  
  /* Neutral Colors */
  --white: #FFFFFF;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 10px 10px -5px rgb(0 0 0 / 0.04);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
}

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

body {
  font-family: 'Fredoka', sans-serif;
  background: linear-gradient(135deg, var(--mario-blue) 0%, var(--mario-purple) 50%, var(--mario-red) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  color: var(--gray-800);
  line-height: 1.6;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(255, 214, 0, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(33, 150, 243, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(255, 23, 68, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--white) 0%, rgba(255, 255, 255, 0.95) 100%);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-xl);
  padding: var(--space-6) 0;
  margin-bottom: var(--space-8);
  border-bottom: 3px solid var(--mario-yellow);
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 214, 0, 0.2), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

.logo {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(45deg, var(--mario-red), var(--mario-yellow), var(--mario-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  margin-bottom: var(--space-2);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
  animation: pulse 2s ease-in-out infinite alternate;
}

@keyframes pulse {
  from { transform: scale(1); }
  to { transform: scale(1.02); }
}

.subtitle {
  text-align: center;
  color: var(--gray-700);
  font-size: 1.2rem;
  font-weight: 500;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

/* Main Content */
.main {
  padding-bottom: var(--space-16);
}

/* Screens */
.screen {
  display: none;
}

.screen.active {
  display: block;
  animation: fadeIn 0.3s ease-in-out;
}

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

/* Cards */
.welcome-card,
.setup-card,
.history-card,
.final-card {
  background: linear-gradient(135deg, var(--white) 0%, rgba(255, 255, 255, 0.98) 100%);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-2xl);
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.welcome-card::before,
.setup-card::before,
.history-card::before,
.final-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mario-red), var(--mario-yellow), var(--mario-blue), var(--mario-green));
}

.welcome-card h2,
.setup-card h2,
.history-card h2,
.final-card h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--gray-800);
}

.welcome-card p,
.setup-card p {
  font-size: 1.1rem;
  color: var(--gray-600);
  margin-bottom: var(--space-8);
}

/* Buttons */
.btn {
  font-family: inherit;
  font-weight: 500;
  font-size: 1.1rem;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-2xl);
}

.btn:hover::before {
  left: 100%;
}

.btn:active {
  transform: translateY(-1px) scale(1);
}

.btn-primary {
  background: linear-gradient(135deg, var(--mario-red), #FF4569);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(255, 23, 68, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #FF4569, var(--mario-red));
  box-shadow: 0 8px 25px rgba(255, 23, 68, 0.6);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--mario-blue), #42A5F5);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(33, 150, 243, 0.4);
}

.btn-secondary:hover {
  background: linear-gradient(135deg, #42A5F5, var(--mario-blue));
  box-shadow: 0 8px 25px rgba(33, 150, 243, 0.6);
}

.btn-accent {
  background: linear-gradient(135deg, var(--mario-yellow), #FFEB3B);
  color: var(--gray-800);
  box-shadow: 0 4px 15px rgba(255, 214, 0, 0.4);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #FFEB3B, var(--mario-yellow));
  box-shadow: 0 8px 25px rgba(255, 214, 0, 0.6);
}

.btn-success {
  background: linear-gradient(135deg, var(--mario-green), #66BB6A);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.4);
}

.btn-success:hover {
  background: linear-gradient(135deg, #66BB6A, var(--mario-green));
  box-shadow: 0 8px 25px rgba(76, 175, 80, 0.6);
}

.btn-warning {
  background: linear-gradient(135deg, var(--mario-orange), #FFB74D);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(255, 152, 0, 0.4);
}

.btn-warning:hover {
  background: linear-gradient(135deg, #FFB74D, var(--mario-orange));
  box-shadow: 0 8px 25px rgba(255, 152, 0, 0.6);
}

/* Action Buttons */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

@media (min-width: 640px) {
  .action-buttons {
    flex-direction: row;
    justify-content: center;
  }
}

/* Join Form */
.join-form {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

.join-form input {
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 1rem;
  width: 100%;
  max-width: 300px;
  font-family: inherit;
}

.join-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgb(227 30 36 / 0.1);
}

.hidden {
  display: none !important;
}

/* Team Size Buttons */
.team-size-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-4);
  max-width: 500px;
  margin: 0 auto;
}

.team-size-btn {
  background: linear-gradient(135deg, var(--white), var(--gray-50));
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.team-size-btn:hover {
  border-color: var(--mario-yellow);
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--white), rgba(255, 214, 0, 0.1));
}

.team-size-btn.selected {
  background: linear-gradient(135deg, var(--mario-red), #FF4569);
  border-color: var(--mario-red);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.team-size-btn .size {
  font-size: 2.5rem;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.team-size-btn .label {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Teams Container */
#teams-container {
  margin-bottom: var(--space-8);
}

.team-box {
  background: linear-gradient(135deg, var(--white), var(--gray-50));
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.team-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--mario-red), var(--mario-yellow), var(--mario-blue));
}

.team-box:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.team-box h3 {
  color: var(--gray-700);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.remove-team-btn {
  background: linear-gradient(135deg, var(--error), #EF5350);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  padding: var(--space-1) var(--space-2);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s ease;
  font-weight: 500;
}

.remove-team-btn:hover {
  background: linear-gradient(135deg, #EF5350, var(--error));
  transform: scale(1.05);
}

.player-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
}

.player-inputs input {
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s ease;
  background: var(--white);
}

.player-inputs input:focus {
  outline: none;
  border-color: var(--mario-yellow);
  box-shadow: 0 0 0 3px rgba(255, 214, 0, 0.3);
  transform: scale(1.02);
}

/* Team Name Input */
.team-name-input {
  background: linear-gradient(135deg, var(--white), var(--gray-50));
  border: 2px solid var(--mario-yellow);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-800);
  font-family: inherit;
  transition: all 0.3s ease;
  min-width: 150px;
  margin-right: var(--space-3);
}

.team-name-input:focus {
  outline: none;
  border-color: var(--mario-red);
  box-shadow: 0 0 0 3px rgba(255, 23, 68, 0.3);
  transform: scale(1.02);
  background: linear-gradient(135deg, var(--white), rgba(255, 214, 0, 0.1));
}

.team-name-input:hover {
  border-color: var(--mario-orange);
  background: linear-gradient(135deg, var(--white), rgba(255, 152, 0, 0.1));
}

/* Tournament Dashboard */
.tournament-header {
  background: linear-gradient(135deg, var(--white), rgba(255, 255, 255, 0.95));
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
  text-align: center;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.tournament-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mario-red), var(--mario-yellow), var(--mario-blue), var(--mario-green));
}

.tournament-header h2 {
  font-size: 2.2rem;
  margin-bottom: var(--space-2);
  color: var(--gray-800);
  font-weight: 700;
}

.tournament-code {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--white);
  background: linear-gradient(135deg, var(--mario-red), var(--mario-orange));
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-lg);
  display: inline-block;
  box-shadow: var(--shadow-md);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Tabs */
.tournament-tabs {
  display: flex;
  background: linear-gradient(135deg, var(--white), rgba(255, 255, 255, 0.95));
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-xl);
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.tab-btn {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: none;
  background: transparent;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  color: var(--gray-600);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
}

.tab-btn:hover {
  background: rgba(255, 214, 0, 0.1);
  color: var(--gray-800);
  transform: translateY(-1px);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--mario-red), var(--mario-orange));
  color: var(--white);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease-in-out;
}

/* Race Card */
.race-card {
  background: linear-gradient(135deg, var(--white), rgba(255, 255, 255, 0.95));
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-xl);
  margin-bottom: var(--space-6);
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.race-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mario-green), var(--mario-yellow), var(--mario-red));
}

.race-lineup {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.racer-card {
  background: linear-gradient(135deg, var(--white), var(--gray-50));
  border: 2px solid var(--gray-300);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-align: center;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.racer-card::before {
  content: '🏎️';
  position: absolute;
  top: -10px;
  right: -10px;
  font-size: 2rem;
  opacity: 0.1;
  transform: rotate(15deg);
}

.racer-card:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: var(--mario-yellow);
}

.racer-card h4 {
  font-size: 1.2rem;
  margin-bottom: var(--space-2);
  color: var(--gray-800);
  font-weight: 600;
}

.racer-card .team-name {
  font-size: 0.875rem;
  color: var(--white);
  background: linear-gradient(135deg, var(--mario-blue), var(--mario-purple));
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  display: inline-block;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Results Form */
.race-results {
  background: linear-gradient(135deg, var(--white), rgba(255, 255, 255, 0.95));
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.result-input {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3);
  background: linear-gradient(135deg, var(--white), var(--gray-50));
  border-radius: var(--radius);
  margin-bottom: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.result-input:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
}

.result-input .position {
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--mario-red);
  min-width: 30px;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.result-input .player-name {
  flex: 1;
  font-weight: 600;
  color: var(--gray-800);
}

.result-input select {
  padding: var(--space-2) var(--space-3);
  border: 2px solid var(--gray-300);
  border-radius: var(--radius);
  font-family: inherit;
  background: var(--white);
  transition: all 0.3s ease;
  font-weight: 500;
}

.result-input select:focus {
  outline: none;
  border-color: var(--mario-yellow);
  box-shadow: 0 0 0 3px rgba(255, 214, 0, 0.3);
}

.result-input select.error {
  border-color: var(--error);
  background-color: rgba(244, 67, 54, 0.1);
}

.position-error {
  font-size: 0.875rem;
  color: var(--error);
  margin-top: var(--space-1);
  font-weight: 500;
  animation: fadeIn 0.3s ease-in-out;
}

/* Standings */
.standings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.standings-card {
  background: linear-gradient(135deg, var(--white), rgba(255, 255, 255, 0.95));
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.standings-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mario-yellow), var(--mario-green), var(--mario-blue));
}

.standings-card h3 {
  font-size: 1.7rem;
  margin-bottom: var(--space-4);
  color: var(--gray-800);
  text-align: center;
  font-weight: 700;
}

.standings-list {
  list-style: none;
}

.standings-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(135deg, var(--white), var(--gray-50));
  border-radius: var(--radius);
  margin-bottom: var(--space-2);
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
}

.standings-item:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
}

.standings-item.winner {
  background: linear-gradient(135deg, var(--mario-yellow), #FFD54F);
  font-weight: 700;
  border: 2px solid var(--mario-orange);
  box-shadow: var(--shadow-lg);
  animation: winner-glow 2s ease-in-out infinite alternate;
}

@keyframes winner-glow {
  from { box-shadow: var(--shadow-lg); }
  to { box-shadow: 0 0 20px rgba(255, 214, 0, 0.5), var(--shadow-lg); }
}

.standings-position {
  font-weight: 700;
  color: var(--mario-red);
  margin-right: var(--space-3);
  font-size: 1.1rem;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.standings-name {
  flex: 1;
  font-weight: 600;
}

.standings-points {
  font-weight: 700;
  color: var(--gray-700);
  font-size: 1.1rem;
}

/* History */
.tournament-item {
  background: linear-gradient(135deg, var(--white), rgba(255, 255, 255, 0.95));
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.tournament-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--mario-red), var(--mario-yellow), var(--mario-blue));
}

.tournament-item:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-2xl);
}

.race-history-item {
  background: linear-gradient(135deg, var(--white), var(--gray-50));
  border-radius: var(--radius);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border: 1px solid var(--gray-200);
}

.race-history-item:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
}

/* Final Results */
.final-card {
  background: linear-gradient(135deg, var(--mario-yellow), #FFD54F, var(--mario-orange));
  color: var(--gray-800);
  box-shadow: var(--shadow-2xl);
  animation: celebration 3s ease-in-out infinite alternate;
}

@keyframes celebration {
  from { transform: scale(1); }
  to { transform: scale(1.02); }
}

.winner-announcement {
  background: linear-gradient(135deg, var(--white), rgba(255, 255, 255, 0.95));
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-6) 0;
  text-align: center;
  box-shadow: var(--shadow-xl);
  border: 2px solid var(--mario-yellow);
  position: relative;
  overflow: hidden;
}

.winner-announcement::before {
  content: '🏆';
  position: absolute;
  top: -20px;
  right: -20px;
  font-size: 4rem;
  opacity: 0.1;
  transform: rotate(15deg);
}

.winner-announcement h3 {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
  background: linear-gradient(45deg, var(--mario-red), var(--mario-yellow), var(--mario-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.final-standings {
  margin-top: var(--space-6);
}

.final-standings h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-4);
  color: var(--gray-800);
  font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .logo {
    font-size: 2.2rem;
  }
  
  .welcome-card,
  .setup-card,
  .history-card,
  .final-card {
    padding: var(--space-6);
  }
  
  .team-size-buttons {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .tournament-tabs {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .tab-btn {
    text-align: center;
  }
  
  .race-lineup {
    grid-template-columns: 1fr;
  }
  
  .standings-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .action-buttons {
    flex-direction: column;
  }
  
  .team-size-buttons {
    grid-template-columns: 1fr;
  }
  
  .player-inputs {
    grid-template-columns: 1fr;
  }
  
  .logo {
    font-size: 1.8rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
}

/* Loading Animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--white);
  animation: spin 1s ease-in-out infinite;
}

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

/* Success/Error Messages */
.message {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  margin-bottom: var(--space-4);
  font-weight: 500;
  text-align: center;
}

.message.success {
  background: linear-gradient(135deg, var(--mario-green), #66BB6A);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}

.message.error {
  background: linear-gradient(135deg, var(--error), #EF5350);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(244, 67, 54, 0.3);
}

.message.info {
  background: linear-gradient(135deg, var(--mario-blue), #42A5F5);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(33, 150, 243, 0.3);
}