/* ===== reset cơ bản ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto;
}

/* ===== layout tổng ===== */
body {
  min-height: 100vh;
  background-color: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
}

.login-page {
  width: 100%;
  max-width: 360px;
  padding: 16px;
}

/* ===== khung login ===== */
.login-box {
  background-color: #ffffff;
  padding: 24px 20px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* ===== logo ===== */
.logo {
  text-align: center;
  font-size: 28px;
  font-weight: 700;
  color: #1877f2;
  margin-bottom: 20px;
}

/* ===== form ===== */
#login-form input {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 12px;
  border-radius: 6px;
  border: 1px solid #ddd;
  font-size: 16px;
}

#login-form input:focus {
  outline: none;
  border-color: #1877f2;
}

/* ===== nút đăng nhập ===== */
#btn-login {
  width: 100%;
  padding: 12px;
  background-color: #1877f2;
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#btn-login:active {
  background-color: #166fe5;
}

/* ===== footer ===== */
.login-footer {
  margin-top: 16px;
  text-align: center;
  font-size: 12px;
  color: #888;
}