:root {
  /* Color Palette - Vibrant Dark Theme */
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --secondary: #ec4899;
  --secondary-light: #f472b6;
  --accent: #14b8a6;
  --accent-light: #2dd4bf;

  /* Backgrounds */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-glass: rgba(30, 41, 59, 0.7);

  /* Text Colors */
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;

  /* Status Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, #1a1f3a 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 2rem;
  color: var(--text-primary);
}

h3 {
  font-size: 1.5rem;
  color: var(--text-primary);
}

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

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

/* Header */
.header {
  text-align: center;
  padding: var(--spacing-2xl) 0;
  margin-bottom: var(--spacing-xl);
}

.header h1 {
  margin-bottom: var(--spacing-sm);
  animation: fadeInDown 0.6s ease-out;
}

.header p {
  font-size: 1.125rem;
  color: var(--text-muted);
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  border-bottom: 2px solid var(--bg-tertiary);
  animation: fadeIn 0.6s ease-out 0.4s both;
}

.tab-button {
  padding: var(--spacing-md) var(--spacing-xl);
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-base);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.tab-button:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.tab-button.active {
  color: var(--primary-light);
}

.tab-button.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  animation: slideIn 0.3s ease-out;
}

/* Tab Content */
.tab-content {
  display: none;
  animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
  display: block;
}

/* Cards */
.card {
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border-color: rgba(99, 102, 241, 0.3);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--bg-tertiary);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: 2px solid var(--bg-tertiary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder {
  color: var(--text-muted);
}

/* Buttons */
.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary), #db2777);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(236, 72, 153, 0.3);
}

.btn-success {
  background: linear-gradient(135deg, var(--success), #059669);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(16, 185, 129, 0.3);
}

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

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

.btn-small {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Competitor List */
.competitor-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-height: 400px;
  overflow-y: auto;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.competitor-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  animation: slideInLeft 0.3s ease-out;
}

.competitor-item:hover {
  background: var(--bg-glass);
  transform: translateX(4px);
}

.competitor-name {
  font-weight: 500;
  color: var(--text-primary);
}

/* Bracket Visualization */
.bracket-container {
  overflow-x: auto;
  padding: var(--spacing-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-xl);
}

.bracket {
  display: flex;
  gap: var(--spacing-2xl);
  min-width: min-content;
}

.bracket-round {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  min-width: 200px;
}

.round-title {
  text-align: center;
  font-weight: 700;
  color: var(--primary-light);
  margin-bottom: var(--spacing-lg);
  font-size: 1.125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.match {
  background: var(--bg-glass);
  border: 2px solid var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  transition: all var(--transition-base);
  position: relative;
}

.match:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
  transform: scale(1.02);
}

.match.active {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(20, 184, 166, 0.3);
}

.match.completed {
  border-color: var(--success);
}

.card.match-tied {
  border-color: var(--warning);
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.2);
}

.match-competitor.tied {
  border-left: 4px solid var(--warning);
}

.match-competitor {
  padding: var(--spacing-sm) var(--spacing-md);
  margin: var(--spacing-xs) 0;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.match-competitor:hover {
  background: var(--bg-tertiary);
  transform: translateX(2px);
}

.match-competitor.winner {
  background: linear-gradient(90deg, var(--success), transparent);
  font-weight: 700;
  color: var(--text-primary);
}

.match-competitor.selectable:hover {
  background: var(--primary);
  color: white;
}

.vote-count {
  background: var(--bg-tertiary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-light);
}

/* Voting Code Display */
.voting-code-display {
  background: linear-gradient(135deg, var(--primary-dark), var(--secondary));
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  text-align: center;
  margin: var(--spacing-xl) 0;
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  animation: pulse 2s ease-in-out infinite;
}

.voting-code-label {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-sm);
}

.voting-code {
  font-size: 2.5rem;
  font-weight: 700;
  font-family: 'Courier New', monospace;
  color: white;
  letter-spacing: 0.2em;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Alerts */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  border-left: 4px solid;
  animation: slideInRight 0.3s ease-out;
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--error);
  color: var(--error);
}

.alert-info {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--info);
  color: var(--info);
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--warning);
  color: var(--warning);
}

/* Loading Spinner */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(99, 102, 241, 0.3);
  border-radius: 50%;
  border-top-color: var(--primary);
  animation: spin 1s linear infinite;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-muted);
}

.mb-0 {
  margin-bottom: 0;
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

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

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.mt-0 {
  margin-top: 0;
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.hidden {
  display: none !important;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    transform: scaleX(0);
  }

  to {
    transform: scaleX(1);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes pulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.02);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-md);
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .tabs {
    flex-direction: column;
    border-bottom: none;
  }

  .tab-button {
    width: 100%;
    border-radius: var(--radius-md);
  }

  .tab-button.active::after {
    display: none;
  }

  .card {
    padding: var(--spacing-md);
  }

  .bracket {
    gap: var(--spacing-md);
  }

  .bracket-round {
    min-width: 150px;
  }

  .voting-code {
    font-size: 1.75rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  transition: opacity 0.3s ease;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  animation: modal-in 0.3s ease-out;
}

@keyframes modal-in {
  from {
    transform: translateY(20px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-title {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-message {
  margin-bottom: 2rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}

/* Bracket Edit Enhancements */
.match-competitor.selected {
  border: 2px solid var(--primary);
  background: rgba(99, 102, 241, 0.2);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.edit-mode .match-competitor {
  cursor: pointer;
  position: relative;
}

.set-winner-btn {
  position: absolute;
  right: -30px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--success);
  color: white;
  border: none;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s;
  z-index: 10;
}

.match-competitor:hover .set-winner-btn {
  opacity: 1;
}

.set-winner-btn:hover {
  transform: translateY(-50%) scale(1.2);
  background: var(--success-light);
}