body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background: #f6f8fa;
}

.flat-card {
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.04);
  padding: 2.5rem 2rem;
  margin-top: 2rem;
}
.profile-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: #22223b;
}
.profile-subtitle {
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}
.btn-flat {
  color: #fff;
  border-radius: 8px;
  border: none;
  padding: 0.75rem 2rem;
  font-weight: 600;
  transition: background 0.2s;
}
.btn-flat:hover {
  background: #4a4e69;
  color: #fff;
}
.profile-img {
  max-width: 260px;
}
@media (max-width: 767px) {
  .flat-card {
    padding: 1.5rem 1rem;
  }
  .profile-title {
    font-size: 2rem;
  }
}

header {
  background: #333;
  color: #fff;
  padding: 10px 0;
  text-align: center;
}

nav {
  margin: 10px 0;
}

nav a {
  color: #fff;
  text-decoration: none;
  padding: 10px 15px;
}

.container {
  width: 80%;
  margin: auto;
  overflow: hidden;
}

footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 10px 0;
  position: relative;
  bottom: 0;
  width: 100%;
}

@media (max-width: 600px) {
  .container {
    width: 100%;
    padding: 0 10px;
  }

  nav a {
    display: block;
    margin: 5px 0;
  }
}

form {
  display: flex;
  flex-direction: column;
}

form input,
form textarea {
  margin: 10px 0;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

form input[type="submit"] {
  background: #333;
  color: #fff;
  border: none;
  cursor: pointer;
}

form input[type="submit"]:hover {
  background: #575757;
}