* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: #07090e;
  background-image: radial-gradient(circle at 50% 0%, rgba(30, 58, 138, 0.15), transparent 60%);
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont,
               "SF Pro Display", "SF Pro Text", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 420px;
  margin: 72px auto 40px;
  padding: 34px;
  background: rgba(18, 24, 38, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

h1 {
  margin: 0;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.4px;
  text-align: center;
  font-family: arial;
}

.sub {
  margin-top: 8px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.55);
  text-align: center;
}

form {
  margin-top: 26px;
}

input {
  width: 100%;
  padding: 15px 16px;
  margin-top: 14px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  outline: none;
  background: rgba(0, 0, 0, 0.2);
  color: #ffffff;
  font-size: 15px;
  font-weight: 500;
}

input::placeholder {
  color: rgba(255, 255, 255, 0.55);
  font-weight: 500;
}

button {
  display: block;
  width: 100%;
  margin-top: 26px;
  padding: 15px 0;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  background: linear-gradient(135deg, #1e3a8a, #3b82f6);
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.2px;
  box-shadow: 0 12px 30px rgba(59, 130, 246, 0.35);
}

button:active {
  transform: translateY(1px);
  box-shadow: 0 8px 18px rgba(59, 130, 246, 0.35);
}

.helper {
  margin-top: 18px;
  text-align: center;
}

.helper a {
  font-size: 14px;
  font-weight: 500;
  color: #3b82f6;
  text-decoration: none;
}

.helper a:hover {
  text-decoration: underline;
}

footer {
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 24px;
}

footer a {
  color: #3b82f6;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .container {
    margin: 48px 16px 32px;
    padding: 28px;
  }
}