:root {
  --primary: #3498db;
  --primary-dark: #2980b9;
  --bg: #f0f4f8;
  --text: #2c3e50;
  --muted: #7f8c8d;
}

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

body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #f0f4f8 0%, #e6ecf1 100%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.container {
  background: white;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  padding: 3rem 2rem;
  max-width: 700px;
  width: 100%;
  text-align: center;
}

.logo {
  max-width: 200px;
  margin: 0 auto 1.5rem;
  height: auto;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

p.subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.btn-group {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  flex: 1;
  min-width: 200px;
  max-width: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.2rem 2rem;
  border-radius: 10px;
  background-color: var(--primary);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transition: 0.3s ease;
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.btn-english {
  margin-top: 0px;
}

.btn i {
  font-size: 2.5rem;
  margin-bottom: 0.7rem;
}

.btn span {
  font-size: 0.9rem;
  font-weight: normal;
  margin-top: 0.3rem;
}

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

.back-link-container {
  position: fixed;
  bottom: 20px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  z-index: 998;
}

.back-link {
  background: white;
  padding: 0.8rem 1.5rem;
  border-radius: 30px;
  font-size: 0.9rem;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.back-link:hover {
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.footer {
  margin-top: 2.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}

@media (max-width: 500px) {
  h1 {
    font-size: 1.6rem;
  }

  .container {
    padding: 2rem 1.5rem;
  }

  .btn-group {
    flex-direction: column;
    gap: 10px;
  }

  .btn-english {
    margin-top: 10px;
  }
}