:root {
  --primary-color: #1a73e8;
  --primary-dark: #1557b0;
  --secondary-color: #34a853;
  --accent-color: #ea4335;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --bg-light: #f8f9fa;
  --bg-white: #ffffff;
  --border-color: #dadce0;
  --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-hover: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  --radius: 8px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-light);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

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

.navbar {
  background: var(--bg-white);
  box-shadow: var(--shadow);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 64px;
}

.navbar .container {
  display: grid;
  align-items: center;
  grid-template-columns: auto 1fr auto;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 600;
  color: var(--primary-color);
  flex: 0 0 auto;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  flex-wrap: nowrap;
  white-space: nowrap;
  justify-content: center;
  min-width: 0;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
  padding: 8px 0;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-color);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-color);
  border-radius: 2px;
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 0 0 auto;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  transition: var(--transition);
}

.lang-toggle:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.lang-toggle i {
  font-size: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: 14px;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

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

.btn-success {
  background: var(--secondary-color);
  color: white;
}

.btn-success:hover {
  background: #2d9248;
}

.btn-danger {
  background: var(--accent-color);
  color: white;
}

.btn-danger:hover {
  background: #d33426;
}

.btn-small {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-large {
  padding: 14px 32px;
  font-size: 16px;
}

.hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero p {
  font-size: 20px;
  opacity: 0.9;
  margin-bottom: 32px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.hero-buttons .btn {
  padding: 14px 32px;
  font-size: 16px;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 16px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.card-body {
  padding: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.card-text {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-secondary);
}

.features {
  background: var(--bg-white);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.feature-item {
  text-align: center;
  padding: 32px 24px;
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: white;
}

.feature-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-item p {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer {
  background: #1a1a2e;
  color: white;
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h3 {
  font-size: 20px;
  margin-bottom: 16px;
}

.footer-brand p {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  line-height: 1.8;
}

.footer-links h4 {
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.5);
  font-size: 14px;
}

.page-header {
  padding: 120px 0 40px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
}

.page-header h1 {
  font-size: 36px;
  font-weight: 600;
}

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

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

.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 14px;
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 14px;
  background: white;
  cursor: pointer;
}

.form-select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.badge-success {
  background: #e6f4ea;
  color: #137333;
}

.badge-warning {
  background: #fef7e0;
  color: #b45309;
}

.badge-danger {
  background: #fce8e6;
  color: #c5221f;
}

.badge-info {
  background: #e8f0fe;
  color: #1967d2;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9);
  transition: var(--transition);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.modal-header h3 {
  font-size: 20px;
  font-weight: 600;
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 24px;
  color: var(--text-secondary);
}

.alert {
  padding: 16px 20px;
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.alert-success {
  background: #e6f4ea;
  color: #137333;
  border: 1px solid #81c995;
}

.alert-error {
  background: #fce8e6;
  color: #c5221f;
  border: 1px solid #f28b82;
}

.alert-warning {
  background: #fef7e0;
  color: #b45309;
  border: 1px solid #fdd663;
}

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
}