* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Arial, sans-serif;
}
body {
  background-color: #000;
  color: #fff;
  font-family: "Rubik", sans-serif;
  margin: 0;
  padding: 0px 100px;
}
/* Menu cố định trên đầu trang */
.menu {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 50px;
}
.icon_menu {
  display: block;
  margin-bottom: 30px;
  cursor: pointer;
}

.logo {
  font-family: "Rubik Mono One", monospace;
  font-weight: 700;
  font-size: 24px;
  color: #0063ff;
  margin: 0;
}

/* header */

.header {
  padding: 24px 30px 20px;
  text-align: center;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#row1 {
  font-weight: 600;
  color: #1a73e8;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
}
.header h1 {
  font-size: 40px;
  color: #ccc;
  margin-bottom: 8px;
}
#row3 {
  font-size: 16px;
  line-height: 1.4;
  color: #aaa;
}
/* container nhỏ gọn hơn cho login */
.login-container {
  justify-content: center;
  align-items: center;
  max-width: 600px;
  margin: 40px auto;
  padding: 40px;
  border-radius: 10px;
  border: 1px solid #222;
  background: #0b0b0b;
}

/* căn giữa text */
.login-container form {
  width: 100%;
}

.login-container .form-group {
  margin-bottom: 25px;
}

.login-container label {
  font-size: 14px;
  color: #fff;
  margin-bottom: 8px;
  display: block;
}

.login-container input {
  background: transparent;
  border: none;
  border-bottom: 1px solid #555;
  color: #fff;
  padding: 12px 0;
  font-size: 16px;
  width: 100%;
}

.login-container input:focus {
  border-bottom: 1px solid #1a73e8;
  outline: none;
}

.login-container .btn {
  display: block;
  margin: 30px auto 0;
  background-color: #0063ff;
  color: white;
  border: none;
  padding: 14px 30px;
  border-radius: 25px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.login-container .btn:hover {
  background-color: #0051d4;
}
/* Link dưới form login */
.login-container .register-link {
  margin-top: 20px;
  font-size: 14px;
  text-align: center;
  color: #aaa;
}

.login-container .register-link a {
  color: #0063ff; /* xanh nổi bật */
  font-weight: 600;
  text-decoration: none;
}

.login-container .register-link a:hover {
  text-decoration: underline;
}