:root {
  --color-bg-start: #d0e8ff;
  --color-bg-end: #ffffff;
  --color-text: #121212;
  --color-heading: #0c1464;
  --color-primary: #3b82f6;
  --color-primary-dark: #1e40af;
  --color-button-bg: #0c1464;
  --color-button-text: #ffffff;
  --input-bg: #f0f7ff;
  --input-border: #b0c4de;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 3rem 2rem;
  font-family: var(--font-sans);
  background: linear-gradient(135deg, var(--color-bg-start), var(--color-bg-end));
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow-x: hidden;
}

.container {
  max-width: 420px;
  width: 100%;
  background: #ffffffdd;
  padding: 2.5rem 3rem;
  border-radius: 1rem;
  box-shadow: 0 8px 30px rgba(14, 30, 90, 0.2);
  animation: fadeInUp 1s ease forwards;
  opacity: 0;
  transform: translateY(40px);
}

h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--color-heading);
  animation: fadeInUp 0.8s ease forwards;
  opacity: 0;
  transform: translateY(20px);
}

form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

label {
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 0.3rem;
  display: block;
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 0.9rem 1rem;
  font-size: 1rem;
  border-radius: 0.5rem;
  border: 1.5px solid var(--input-border);
  background-color: var(--input-bg);
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: var(--color-primary);
  background-color: #e6f0ff;
}

button[type="submit"] {
  margin-top: 1rem;
  background-color: var(--color-button-bg);
  color: var(--color-button-text);
  padding: 1rem 2rem;
  font-size: 1.2rem;
  font-weight: 700;
  border: none;
  border-radius: 0.75rem;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
  animation: fadeInUp 1s ease forwards;
  opacity: 0;
  transform: translateY(20px);
}

button[type="submit"]:hover,
button[type="submit"]:focus {
  background-color: var(--color-primary);
  outline: none;
  transform: scale(1.05);
}

p.login-link {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--color-primary-dark);
  text-align: center;
  animation: fadeInUp 1s ease forwards;
  animation-delay: 0.8s;
  opacity: 0;
  transform: translateY(20px);
}

p.login-link a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

p.login-link a:hover,
p.login-link a:focus {
  text-decoration: underline;
  outline: none;
}

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

@media (max-width: 480px) {
  .container {
    max-width: 90vw;
    padding: 2rem 1.5rem;
  }
  h1 {
    font-size: 2.4rem;
  }
}