:root {
  --primary: #2c3e50;
  --secondary: #3498db;
  --accent: #2ecc71;
  --dark: #1a202c;
  --light: #f8fafc;
  --gray: #64748b;
  --border: #e2e8f0;
  --shadow: rgba(0, 0, 0, 0.1);
  --card-bg: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
}

.dark {
  --primary: #cbd5e1;
  --secondary: #60a5fa;
  --accent: #34d399;
  --dark: #0f172a;
  --light: #1e293b;
  --gray: #94a3b8;
  --border: #334155;
  --shadow: rgba(0, 0, 0, 0.3);
  --card-bg: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--light);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.3s, color 0.3s;
}

body.dark {
  background-color: var(--dark);
  color: var(--text-primary);
}

.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  background-color: var(--card-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

body.dark header {
  border-color: #2d3748;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary);
}

body.dark .logo {
  color: var(--primary);
}

.logo i {
  color: var(--secondary);
  font-size: 1.8rem;
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--gray);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: background-color 0.3s, transform 0.3s;
}

.theme-toggle:hover {
  background-color: rgba(0, 0, 0, 0.05);
  transform: rotate(15deg);
}

body.dark .theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Hero Section */
.hero {
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.hero h1::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  border-radius: 2px;
}

body.dark .hero h1 {
  color: var(--primary);
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
  height: 100%;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
}

body.dark .card {
  background-color: var(--card-bg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  border-color: #334155;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px var(--shadow);
}

.card-header {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 15px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(90deg, rgba(52, 152, 219, 0.05), transparent);
}

body.dark .card-header {
  border-color: #4a5568;
  background: linear-gradient(90deg, rgba(96, 165, 250, 0.05), transparent);
}

.card-icon {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  flex-shrink: 0;
}

.card-icon.admin {
  background: linear-gradient(135deg, #3498db, #2980b9);
}

.card-icon.screen {
  background: linear-gradient(135deg, #2ecc71, #27ae60);
}

.card-icon.player {
  background: linear-gradient(135deg, #e74c3c, #c0392b);
}

.card-title {
  font-weight: 600;
  font-size: 1.2rem;
  margin: 0;
}

.card-body {
  padding: 24px;
  flex-grow: 1;
  color: var(--text-secondary);
}

.card-footer {
  padding: 16px 24px 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.3s, transform 0.2s;
  width: 100%;
  justify-content: center;
  font-size: 1rem;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.btn:hover {
  background-color: #34495e;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

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

.btn.btn-admin {
  background: linear-gradient(135deg, #3498db, #2980b9);
}

.btn.btn-admin:hover {
  background: linear-gradient(135deg, #2980b9, #2573a7);
}

.btn.btn-screen {
  background: linear-gradient(135deg, #2ecc71, #27ae60);
}

.btn.btn-screen:hover {
  background: linear-gradient(135deg, #27ae60, #219653);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-content {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 30px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  position: relative;
  border: 1px solid var(--border);
}

body.dark .modal-content {
  background-color: var(--card-bg);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  border-color: #334155;
}

.modal-close {
  position: absolute;
  top: 15px;
  right: 15px;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--gray);
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s;
}

.modal-close:hover {
  background-color: rgba(0, 0, 0, 0.05);
  color: #e74c3c;
}

body.dark .modal-close:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.modal-title {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--primary);
  font-weight: 600;
  text-align: center;
}

body.dark .modal-title {
  color: var(--primary);
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s, box-shadow 0.3s;
  background-color: var(--card-bg);
  color: var(--text-primary);
}

.form-input:focus {
  border-color: var(--secondary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

body.dark .form-input {
  border-color: #4a5568;
}

.modal-footer {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}
    
.error-message {
  color: #e74c3c;
  margin-top: 10px;
  font-size: 0.9rem;
  text-align: center;
  padding: 10px;
  border-radius: 6px;
  background-color: rgba(231, 76, 60, 0.1);
}

.success-message {
  color: #2ecc71;
  margin-top: 10px;
  font-size: 0.9rem;
  text-align: center;
  padding: 10px;
  border-radius: 6px;
  background-color: rgba(46, 204, 113, 0.1);
}

/* Footer */
footer {
  padding: 40px 0;
  text-align: center;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  background-color: var(--card-bg);
}

body.dark footer {
  border-color: #2d3748;
}

.heart {
  color: #e74c3c;
  animation: pulse 1.5s infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 50px 0;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .card-grid {
    gap: 20px;
  }
  
  .header-container {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .logo {
    font-size: 1.3rem;
  }
  
  .logo span {
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .card-header {
    padding: 20px;
  }
  
  .card-body, .card-footer {
    padding: 20px;
  }
  
  .modal-content {
    padding: 25px 20px;
  }
  
  .modal-title {
    font-size: 1.3rem;
  }
}